src/diffviewer/ydiff.c

src/diffviewer/ydiff.c
/* */
This source file includes following definitions.
TAB_SKIP
fill_by_space
rewrite_backup_content
open_temp
dview_fdopen
dview_ffree
dview_ftemp
dview_fopen
dview_fgets
dview_fseek
dview_freset
dview_fwrite
dview_ftrunc
dview_fclose
dview_popen
dview_pclose
dview_get_byte
dview_get_utf
dview_str_utf8_offset_to_pos
scan_deci
scan_line
scan_diff
dff_execute
printer_for
dff_reparse
lcsubstr
hdiff_multi
hdiff_scan
is_inside
cvt_cpy
cvt_ncpy
cvt_mget
cvt_mgeta
cvt_fget
cc_free_elt
printer
redo_diff
destroy_hdiff
get_digits
get_line_numbers
calc_nwidth
find_prev_hunk
find_next_hunk
get_current_hunk
dview_remove_hunk
dview_add_hunk
dview_replace_hunk
do_merge_hunk
dview_compute_split
dview_compute_areas
dview_reread
dview_set_codeset
dview_select_encoding
dview_load_options
dview_save_options
dview_diff_options
dview_init
dview_fini
dview_display_file
dview_status
dview_redo
dview_update
dview_edit
dview_goto_cmd
dview_labels
dview_save
dview_do_save
dview_ok_to_exit
dview_execute_cmd
dview_handle_key
dview_callback
dview_mouse_callback
dview_dialog_callback
dview_get_title
diff_view
dview_diff_cmd
   1 /*
   2    File difference viewer
   3 
   4    Copyright (C) 2007-2024
   5    Free Software Foundation, Inc.
   6 
   7    Written by:
   8    Daniel Borca <dborca@yahoo.com>, 2007
   9    Slava Zanko <slavazanko@gmail.com>, 2010, 2013
  10    Andrew Borodin <aborodin@vmail.ru>, 2010-2022
  11    Ilia Maslakov <il.smind@gmail.com>, 2010
  12 
  13    This file is part of the Midnight Commander.
  14 
  15    The Midnight Commander is free software: you can redistribute it
  16    and/or modify it under the terms of the GNU General Public License as
  17    published by the Free Software Foundation, either version 3 of the License,
  18    or (at your option) any later version.
  19 
  20    The Midnight Commander is distributed in the hope that it will be useful,
  21    but WITHOUT ANY WARRANTY; without even the implied warranty of
  22    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23    GNU General Public License for more details.
  24 
  25    You should have received a copy of the GNU General Public License
  26    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  27  */
  28 
  29 
  30 #include <config.h>
  31 
  32 #include <ctype.h>
  33 #include <errno.h>
  34 #include <stddef.h>             /* ptrdiff_t */
  35 #include <stdlib.h>
  36 #include <sys/stat.h>
  37 #include <sys/types.h>
  38 #include <sys/wait.h>
  39 
  40 #include "lib/global.h"
  41 #include "lib/tty/tty.h"
  42 #include "lib/tty/color.h"
  43 #include "lib/tty/key.h"
  44 #include "lib/skin.h"           /* EDITOR_NORMAL_COLOR */
  45 #include "lib/vfs/vfs.h"
  46 #include "lib/util.h"
  47 #include "lib/widget.h"
  48 #include "lib/strutil.h"
  49 #ifdef HAVE_CHARSET
  50 #include "lib/charsets.h"
  51 #endif
  52 #include "lib/event.h"          /* mc_event_raise() */
  53 
  54 #include "src/filemanager/cmd.h"        /* edit_file_at_line() */
  55 #include "src/filemanager/panel.h"
  56 #include "src/filemanager/layout.h"     /* Needed for get_current_index and get_other_panel */
  57 
  58 #include "src/execute.h"        /* toggle_subshell() */
  59 #include "src/keymap.h"
  60 #include "src/setup.h"
  61 #include "src/history.h"
  62 #ifdef HAVE_CHARSET
  63 #include "src/selcodepage.h"
  64 #endif
  65 
  66 #include "ydiff.h"
  67 #include "internal.h"
  68 
  69 /*** global variables ****************************************************************************/
  70 
  71 /*** file scope macro definitions ****************************************************************/
  72 
  73 #define FILE_READ_BUF 4096
  74 #define FILE_FLAG_TEMP (1 << 0)
  75 
  76 #define ADD_CH '+'
  77 #define DEL_CH '-'
  78 #define CHG_CH '*'
  79 #define EQU_CH ' '
  80 
  81 #define HDIFF_ENABLE 1
  82 #define HDIFF_MINCTX 5
  83 #define HDIFF_DEPTH 10
  84 
  85 #define FILE_DIRTY(fs) \
  86 do \
  87 { \
  88     (fs)->pos = 0; \
  89     (fs)->len = 0;  \
  90 } \
  91 while (0)
  92 
  93 /*** file scope type declarations ****************************************************************/
  94 
  95 typedef enum
  96 {
  97     FROM_LEFT_TO_RIGHT,
  98     FROM_RIGHT_TO_LEFT
  99 } action_direction_t;
 100 
 101 /*** forward declarations (file scope functions) *************************************************/
 102 
 103 /*** file scope variables ************************************************************************/
 104 
 105 /* --------------------------------------------------------------------------------------------- */
 106 /*** file scope functions ************************************************************************/
 107 /* --------------------------------------------------------------------------------------------- */
 108 
 109 static inline int
 110 TAB_SKIP (int ts, int pos)
     /*   */
 111 {
 112     if (ts > 0 && ts < 9)
 113         return ts - pos % ts;
 114     else
 115         return 8 - pos % 8;
 116 }
 117 
 118 /* --------------------------------------------------------------------------------------------- */
 119 
 120 /**
 121  * Fill buffer by spaces
 122  *
 123  * @param buf buffer
 124  * @param n number of spaces
 125  * @param zero_terminate add a nul after @n spaces
 126  */
 127 static void
 128 fill_by_space (char *buf, size_t n, gboolean zero_terminate)
     /*   */
 129 {
 130     memset (buf, ' ', n);
 131     if (zero_terminate)
 132         buf[n] = '\0';
 133 }
 134 
 135 /* --------------------------------------------------------------------------------------------- */
 136 
 137 static gboolean
 138 rewrite_backup_content (const vfs_path_t *from_file_name_vpath, const char *to_file_name)
     /*   */
 139 {
 140     FILE *backup_fd;
 141     char *contents;
 142     gsize length;
 143     const char *from_file_name;
 144 
 145     from_file_name = vfs_path_get_last_path_str (from_file_name_vpath);
 146     if (!g_file_get_contents (from_file_name, &contents, &length, NULL))
 147         return FALSE;
 148 
 149     backup_fd = fopen (to_file_name, "w");
 150     if (backup_fd == NULL)
 151     {
 152         g_free (contents);
 153         return FALSE;
 154     }
 155 
 156     length = fwrite ((const void *) contents, length, 1, backup_fd);
 157 
 158     fflush (backup_fd);
 159     fclose (backup_fd);
 160     g_free (contents);
 161     return TRUE;
 162 }
 163 
 164 /* buffered I/O ************************************************************* */
 165 
 166 /**
 167  * Try to open a temporary file.
 168  * @note the name is not altered if this function fails
 169  *
 170  * @param[out] name address of a pointer to store the temporary name
 171  * @return file descriptor on success, negative on error
 172  */
 173 
 174 static int
 175 open_temp (void **name)
     /*   */
 176 {
 177     int fd;
 178     vfs_path_t *diff_file_name = NULL;
 179 
 180     fd = mc_mkstemps (&diff_file_name, "mcdiff", NULL);
 181     if (fd == -1)
 182     {
 183         message (D_ERROR, MSG_ERROR,
 184                  _("Cannot create temporary diff file\n%s"), unix_error_string (errno));
 185         return -1;
 186     }
 187 
 188     *name = vfs_path_free (diff_file_name, FALSE);
 189     return fd;
 190 }
 191 
 192 /* --------------------------------------------------------------------------------------------- */
 193 
 194 /**
 195  * Allocate file structure and associate file descriptor to it.
 196  *
 197  * @param fd file descriptor
 198  * @return file structure
 199  */
 200 
 201 static FBUF *
 202 dview_fdopen (int fd)
     /*   */
 203 {
 204     FBUF *fs;
 205 
 206     if (fd < 0)
 207         return NULL;
 208 
 209     fs = g_try_malloc (sizeof (FBUF));
 210     if (fs == NULL)
 211         return NULL;
 212 
 213     fs->buf = g_try_malloc (FILE_READ_BUF);
 214     if (fs->buf == NULL)
 215     {
 216         g_free (fs);
 217         return NULL;
 218     }
 219 
 220     fs->fd = fd;
 221     FILE_DIRTY (fs);
 222     fs->flags = 0;
 223     fs->data = NULL;
 224 
 225     return fs;
 226 }
 227 
 228 /* --------------------------------------------------------------------------------------------- */
 229 
 230 /**
 231  * Free file structure without closing the file.
 232  *
 233  * @param fs file structure
 234  * @return 0 on success, non-zero on error
 235  */
 236 
 237 static int
 238 dview_ffree (FBUF *fs)
     /*   */
 239 {
 240     int rv = 0;
 241 
 242     if ((fs->flags & FILE_FLAG_TEMP) != 0)
 243     {
 244         rv = unlink (fs->data);
 245         g_free (fs->data);
 246     }
 247     g_free (fs->buf);
 248     g_free (fs);
 249     return rv;
 250 }
 251 
 252 /* --------------------------------------------------------------------------------------------- */
 253 
 254 /**
 255  * Open a binary temporary file in R/W mode.
 256  * @note the file will be deleted when closed
 257  *
 258  * @return file structure
 259  */
 260 static FBUF *
 261 dview_ftemp (void)
     /*   */
 262 {
 263     int fd;
 264     FBUF *fs;
 265 
 266     fs = dview_fdopen (0);
 267     if (fs == NULL)
 268         return NULL;
 269 
 270     fd = open_temp (&fs->data);
 271     if (fd < 0)
 272     {
 273         dview_ffree (fs);
 274         return NULL;
 275     }
 276 
 277     fs->fd = fd;
 278     fs->flags = FILE_FLAG_TEMP;
 279     return fs;
 280 }
 281 
 282 /* --------------------------------------------------------------------------------------------- */
 283 
 284 /**
 285  * Open a binary file in specified mode.
 286  *
 287  * @param filename file name
 288  * @param flags open mode, a combination of O_RDONLY, O_WRONLY, O_RDWR
 289  *
 290  * @return file structure
 291  */
 292 
 293 static FBUF *
 294 dview_fopen (const char *filename, int flags)
     /*   */
 295 {
 296     int fd;
 297     FBUF *fs;
 298 
 299     fs = dview_fdopen (0);
 300     if (fs == NULL)
 301         return NULL;
 302 
 303     fd = open (filename, flags);
 304     if (fd < 0)
 305     {
 306         dview_ffree (fs);
 307         return NULL;
 308     }
 309 
 310     fs->fd = fd;
 311     return fs;
 312 }
 313 
 314 /* --------------------------------------------------------------------------------------------- */
 315 
 316 /**
 317  * Read a line of bytes from file until newline or EOF.
 318  * @note does not stop on null-byte
 319  * @note buf will not be null-terminated
 320  *
 321  * @param buf destination buffer
 322  * @param size size of buffer
 323  * @param fs file structure
 324  *
 325  * @return number of bytes read
 326  */
 327 
 328 static size_t
 329 dview_fgets (char *buf, size_t size, FBUF *fs)
     /*   */
 330 {
 331     size_t j = 0;
 332 
 333     do
 334     {
 335         int i;
 336         gboolean stop = FALSE;
 337 
 338         for (i = fs->pos; j < size && i < fs->len && !stop; i++, j++)
 339         {
 340             buf[j] = fs->buf[i];
 341             if (buf[j] == '\n')
 342                 stop = TRUE;
 343         }
 344         fs->pos = i;
 345 
 346         if (j == size || stop)
 347             break;
 348 
 349         fs->pos = 0;
 350         fs->len = read (fs->fd, fs->buf, FILE_READ_BUF);
 351     }
 352     while (fs->len > 0);
 353 
 354     return j;
 355 }
 356 
 357 /* --------------------------------------------------------------------------------------------- */
 358 
 359 /**
 360  * Seek into file.
 361  * @note avoids thrashing read cache when possible
 362  *
 363  * @param fs file structure
 364  * @param off offset
 365  * @param whence seek directive: SEEK_SET, SEEK_CUR or SEEK_END
 366  *
 367  * @return position in file, starting from beginning
 368  */
 369 
 370 static off_t
 371 dview_fseek (FBUF *fs, off_t off, int whence)
     /*   */
 372 {
 373     off_t rv;
 374 
 375     if (fs->len != 0 && whence != SEEK_END)
 376     {
 377         rv = lseek (fs->fd, 0, SEEK_CUR);
 378         if (rv != -1)
 379         {
 380             if (whence == SEEK_CUR)
 381             {
 382                 whence = SEEK_SET;
 383                 off += rv - fs->len + fs->pos;
 384             }
 385             if (off - rv >= -fs->len && off - rv <= 0)
 386             {
 387                 fs->pos = fs->len + off - rv;
 388                 return off;
 389             }
 390         }
 391     }
 392 
 393     rv = lseek (fs->fd, off, whence);
 394     if (rv != -1)
 395         FILE_DIRTY (fs);
 396     return rv;
 397 }
 398 
 399 /* --------------------------------------------------------------------------------------------- */
 400 
 401 /**
 402  * Seek to the beginning of file, thrashing read cache.
 403  *
 404  * @param fs file structure
 405  *
 406  * @return 0 if success, non-zero on error
 407  */
 408 
 409 static off_t
 410 dview_freset (FBUF *fs)
     /*   */
 411 {
 412     off_t rv;
 413 
 414     rv = lseek (fs->fd, 0, SEEK_SET);
 415     if (rv != -1)
 416         FILE_DIRTY (fs);
 417     return rv;
 418 }
 419 
 420 /* --------------------------------------------------------------------------------------------- */
 421 
 422 /**
 423  * Write bytes to file.
 424  * @note thrashes read cache
 425  *
 426  * @param fs file structure
 427  * @param buf source buffer
 428  * @param size size of buffer
 429  *
 430  * @return number of written bytes, -1 on error
 431  */
 432 
 433 static ssize_t
 434 dview_fwrite (FBUF *fs, const char *buf, size_t size)
     /*   */
 435 {
 436     ssize_t rv;
 437 
 438     rv = write (fs->fd, buf, size);
 439     if (rv >= 0)
 440         FILE_DIRTY (fs);
 441     return rv;
 442 }
 443 
 444 /* --------------------------------------------------------------------------------------------- */
 445 
 446 /**
 447  * Truncate file to the current position.
 448  * @note thrashes read cache
 449  *
 450  * @param fs file structure
 451  *
 452  * @return current file size on success, negative on error
 453  */
 454 
 455 static off_t
 456 dview_ftrunc (FBUF *fs)
     /*   */
 457 {
 458     off_t off;
 459 
 460     off = lseek (fs->fd, 0, SEEK_CUR);
 461     if (off != -1)
 462     {
 463         int rv;
 464 
 465         rv = ftruncate (fs->fd, off);
 466         if (rv != 0)
 467             off = -1;
 468         else
 469             FILE_DIRTY (fs);
 470     }
 471     return off;
 472 }
 473 
 474 /* --------------------------------------------------------------------------------------------- */
 475 
 476 /**
 477  * Close file.
 478  * @note if this is temporary file, it is deleted
 479  *
 480  * @param fs file structure
 481  * @return 0 on success, non-zero on error
 482  */
 483 
 484 static int
 485 dview_fclose (FBUF *fs)
     /*   */
 486 {
 487     int rv = -1;
 488 
 489     if (fs != NULL)
 490     {
 491         rv = close (fs->fd);
 492         dview_ffree (fs);
 493     }
 494 
 495     return rv;
 496 }
 497 
 498 /* --------------------------------------------------------------------------------------------- */
 499 
 500 /**
 501  * Create pipe stream to process.
 502  *
 503  * @param cmd shell command line
 504  * @param flags open mode, either O_RDONLY or O_WRONLY
 505  *
 506  * @return file structure
 507  */
 508 
 509 static FBUF *
 510 dview_popen (const char *cmd, int flags)
     /*   */
 511 {
 512     FILE *f;
 513     FBUF *fs;
 514     const char *type = NULL;
 515 
 516     if (flags == O_RDONLY)
 517         type = "r";
 518     else if (flags == O_WRONLY)
 519         type = "w";
 520 
 521     if (type == NULL)
 522         return NULL;
 523 
 524     fs = dview_fdopen (0);
 525     if (fs == NULL)
 526         return NULL;
 527 
 528     f = popen (cmd, type);
 529     if (f == NULL)
 530     {
 531         dview_ffree (fs);
 532         return NULL;
 533     }
 534 
 535     fs->fd = fileno (f);
 536     fs->data = f;
 537     return fs;
 538 }
 539 
 540 /* --------------------------------------------------------------------------------------------- */
 541 
 542 /**
 543  * Close pipe stream.
 544  *
 545  * @param fs structure
 546  * @return 0 on success, non-zero on error
 547  */
 548 
 549 static int
 550 dview_pclose (FBUF *fs)
     /*   */
 551 {
 552     int rv = -1;
 553 
 554     if (fs != NULL)
 555     {
 556         rv = pclose (fs->data);
 557         dview_ffree (fs);
 558     }
 559 
 560     return rv;
 561 }
 562 
 563 /* --------------------------------------------------------------------------------------------- */
 564 
 565 /**
 566  * Get one char (byte) from string
 567  *
 568  * @param str ...
 569  * @param ch ...
 570  * @return TRUE on success, FALSE otherwise
 571  */
 572 
 573 static gboolean
 574 dview_get_byte (const char *str, int *ch)
     /*   */
 575 {
 576     if (str == NULL)
 577         return FALSE;
 578 
 579     *ch = (unsigned char) (*str);
 580     return TRUE;
 581 }
 582 
 583 /* --------------------------------------------------------------------------------------------- */
 584 
 585 #ifdef HAVE_CHARSET
 586 /**
 587  * Get utf multibyte char from string
 588  *
 589  * @param str ...
 590  * @param ch ...
 591  * @param ch_length ...
 592  * @return TRUE on success, FALSE otherwise
 593  */
 594 
 595 static gboolean
 596 dview_get_utf (const char *str, int *ch, int *ch_length)
     /*   */
 597 {
 598     if (str == NULL)
 599         return FALSE;
 600 
 601     *ch = g_utf8_get_char_validated (str, -1);
 602 
 603     if (*ch < 0)
 604     {
 605         *ch = (unsigned char) (*str);
 606         *ch_length = 1;
 607     }
 608     else
 609     {
 610         const char *next_ch;
 611 
 612         /* Calculate UTF-8 char length */
 613         next_ch = g_utf8_next_char (str);
 614         *ch_length = next_ch - str;
 615     }
 616 
 617     return TRUE;
 618 }
 619 
 620 /* --------------------------------------------------------------------------------------------- */
 621 
 622 static int
 623 dview_str_utf8_offset_to_pos (const char *text, size_t length)
     /*   */
 624 {
 625     ptrdiff_t result;
 626 
 627     if (text == NULL || text[0] == '\0')
 628         return length;
 629 
 630     if (g_utf8_validate (text, -1, NULL))
 631         result = g_utf8_offset_to_pointer (text, length) - text;
 632     else
 633     {
 634         gunichar uni;
 635         char *tmpbuf, *buffer;
 636 
 637         buffer = tmpbuf = g_strdup (text);
 638         while (tmpbuf[0] != '\0')
 639         {
 640             uni = g_utf8_get_char_validated (tmpbuf, -1);
 641             if ((uni != (gunichar) (-1)) && (uni != (gunichar) (-2)))
 642                 tmpbuf = g_utf8_next_char (tmpbuf);
 643             else
 644             {
 645                 tmpbuf[0] = '.';
 646                 tmpbuf++;
 647             }
 648         }
 649         result = g_utf8_offset_to_pointer (tmpbuf, length) - tmpbuf;
 650         g_free (buffer);
 651     }
 652     return MAX (length, (size_t) result);
 653 }
 654 #endif /*HAVE_CHARSET */
 655 
 656 /* --------------------------------------------------------------------------------------------- */
 657 
 658 /* diff parse *************************************************************** */
 659 
 660 /**
 661  * Read decimal number from string.
 662  *
 663  * @param[in,out] str string to parse
 664  * @param[out] n extracted number
 665  * @return 0 if success, otherwise non-zero
 666  */
 667 
 668 static int
 669 scan_deci (const char **str, int *n)
     /*   */
 670 {
 671     const char *p = *str;
 672     char *q;
 673 
 674     errno = 0;
 675     *n = strtol (p, &q, 10);
 676     if (errno != 0 || p == q)
 677         return -1;
 678     *str = q;
 679     return 0;
 680 }
 681 
 682 /* --------------------------------------------------------------------------------------------- */
 683 
 684 /**
 685  * Parse line for diff statement.
 686  *
 687  * @param p string to parse
 688  * @param ops list of diff statements
 689  * @return 0 if success, otherwise non-zero
 690  */
 691 
 692 static int
 693 scan_line (const char *p, GArray *ops)
     /*   */
 694 {
 695     DIFFCMD op;
 696 
 697     int f1, f2;
 698     int t1, t2;
 699     int cmd;
 700     gboolean range = FALSE;
 701 
 702     /* handle the following cases:
 703      *  NUMaNUM[,NUM]
 704      *  NUM[,NUM]cNUM[,NUM]
 705      *  NUM[,NUM]dNUM
 706      * where NUM is a positive integer
 707      */
 708 
 709     if (scan_deci (&p, &f1) != 0 || f1 < 0)
 710         return -1;
 711 
 712     f2 = f1;
 713     if (*p == ',')
 714     {
 715         p++;
 716         if (scan_deci (&p, &f2) != 0 || f2 < f1)
 717             return -1;
 718 
 719         range = TRUE;
 720     }
 721 
 722     cmd = *p++;
 723     if (cmd == 'a')
 724     {
 725         if (range)
 726             return -1;
 727     }
 728     else if (cmd != 'c' && cmd != 'd')
 729         return -1;
 730 
 731     if (scan_deci (&p, &t1) != 0 || t1 < 0)
 732         return -1;
 733 
 734     t2 = t1;
 735     range = FALSE;
 736     if (*p == ',')
 737     {
 738         p++;
 739         if (scan_deci (&p, &t2) != 0 || t2 < t1)
 740             return -1;
 741 
 742         range = TRUE;
 743     }
 744 
 745     if (cmd == 'd' && range)
 746         return -1;
 747 
 748     op.a[0][0] = f1;
 749     op.a[0][1] = f2;
 750     op.cmd = cmd;
 751     op.a[1][0] = t1;
 752     op.a[1][1] = t2;
 753     g_array_append_val (ops, op);
 754     return 0;
 755 }
 756 
 757 /* --------------------------------------------------------------------------------------------- */
 758 
 759 /**
 760  * Parse diff output and extract diff statements.
 761  *
 762  * @param f stream to read from
 763  * @param ops list of diff statements to fill
 764  * @return positive number indicating number of hunks, otherwise negative
 765  */
 766 
 767 static int
 768 scan_diff (FBUF *f, GArray *ops)
     /*   */
 769 {
 770     int sz;
 771     char buf[BUFSIZ];
 772 
 773     while ((sz = dview_fgets (buf, sizeof (buf) - 1, f)) != 0)
 774     {
 775         if (isdigit (buf[0]))
 776         {
 777             if (buf[sz - 1] != '\n')
 778                 return -1;
 779 
 780             buf[sz] = '\0';
 781             if (scan_line (buf, ops) != 0)
 782                 return -1;
 783         }
 784         else
 785             while (buf[sz - 1] != '\n' && (sz = dview_fgets (buf, sizeof (buf), f)) != 0)
 786                 ;
 787     }
 788 
 789     return ops->len;
 790 }
 791 
 792 /* --------------------------------------------------------------------------------------------- */
 793 
 794 /**
 795  * Invoke diff and extract diff statements.
 796  *
 797  * @param args extra arguments to be passed to diff
 798  * @param extra more arguments to be passed to diff
 799  * @param file1 first file to compare
 800  * @param file2 second file to compare
 801  * @param ops list of diff statements to fill
 802  *
 803  * @return positive number indicating number of hunks, otherwise negative
 804  */
 805 
 806 static int
 807 dff_execute (const char *args, const char *extra, const char *file1, const char *file2, GArray *ops)
     /*   */
 808 {
 809     static const char *opt =
 810         " --old-group-format='%df%(f=l?:,%dl)d%dE\n'"
 811         " --new-group-format='%dea%dF%(F=L?:,%dL)\n'"
 812         " --changed-group-format='%df%(f=l?:,%dl)c%dF%(F=L?:,%dL)\n'"
 813         " --unchanged-group-format=''";
 814 
 815     int rv;
 816     FBUF *f;
 817     char *cmd;
 818     int code;
 819     char *file1_esc, *file2_esc;
 820 
 821     /* escape potential $ to avoid shell variable substitutions in popen() */
 822     file1_esc = str_shell_escape (file1);
 823     file2_esc = str_shell_escape (file2);
 824     cmd = g_strdup_printf ("diff %s %s %s %s %s", args, extra, opt, file1_esc, file2_esc);
 825     g_free (file1_esc);
 826     g_free (file2_esc);
 827 
 828     if (cmd == NULL)
 829         return -1;
 830 
 831     f = dview_popen (cmd, O_RDONLY);
 832     g_free (cmd);
 833 
 834     if (f == NULL)
 835         return -1;
 836 
 837     rv = scan_diff (f, ops);
 838     code = dview_pclose (f);
 839 
 840     if (rv < 0 || code == -1 || !WIFEXITED (code) || WEXITSTATUS (code) == 2)
 841         rv = -1;
 842 
 843     return rv;
 844 }
 845 
 846 /* --------------------------------------------------------------------------------------------- */
 847 
 848 static gboolean
 849 printer_for (char ch, DFUNC printer, void *ctx, FBUF *f, int *line, off_t *off)
     /*   */
 850 {
 851     size_t sz;
 852     char buf[BUFSIZ];
 853 
 854     sz = dview_fgets (buf, sizeof (buf), f);
 855     if (sz == 0)
 856         return FALSE;
 857 
 858     (*line)++;
 859     printer (ctx, ch, *line, *off, sz, buf);
 860     *off += sz;
 861 
 862     while (buf[sz - 1] != '\n')
 863     {
 864         sz = dview_fgets (buf, sizeof (buf), f);
 865         if (sz == 0)
 866         {
 867             printer (ctx, 0, 0, 0, 1, "\n");
 868             break;
 869         }
 870 
 871         printer (ctx, 0, 0, 0, sz, buf);
 872         *off += sz;
 873     }
 874 
 875     return TRUE;
 876 }
 877 
 878 /* --------------------------------------------------------------------------------------------- */
 879 
 880 /**
 881  * Reparse and display file according to diff statements.
 882  *
 883  * @param ord DIFF_LEFT if 1st file is displayed , DIFF_RIGHT if 2nd file is displayed.
 884  * @param filename file name to display
 885  * @param ops list of diff statements
 886  * @param printer printf-like function to be used for displaying
 887  * @param ctx printer context
 888  *
 889  * @return 0 if success, otherwise non-zero
 890  */
 891 
 892 static int
 893 dff_reparse (diff_place_t ord, const char *filename, const GArray *ops, DFUNC printer, void *ctx)
     /*   */
 894 {
 895     size_t i;
 896     FBUF *f;
 897     int line = 0;
 898     off_t off = 0;
 899     const DIFFCMD *op;
 900     diff_place_t eff;
 901     int add_cmd, del_cmd;
 902 
 903     f = dview_fopen (filename, O_RDONLY);
 904     if (f == NULL)
 905         return -1;
 906 
 907     if (ord != DIFF_LEFT)
 908         ord = DIFF_RIGHT;
 909     eff = ord;
 910 
 911     if (ord != DIFF_LEFT)
 912     {
 913         add_cmd = 'd';
 914         del_cmd = 'a';
 915     }
 916     else
 917     {
 918         add_cmd = 'a';
 919         del_cmd = 'd';
 920     }
 921 #define F1 a[eff][0]
 922 #define F2 a[eff][1]
 923 #define T1 a[ ord^1 ][0]
 924 #define T2 a[ ord^1 ][1]
 925     for (i = 0; i < ops->len; i++)
 926     {
 927         int n;
 928 
 929         op = &g_array_index (ops, DIFFCMD, i);
 930 
 931         n = op->F1;
 932         if (op->cmd != add_cmd)
 933             n--;
 934 
 935         while (line < n && printer_for (EQU_CH, printer, ctx, f, &line, &off))
 936             ;
 937 
 938         if (line != n)
 939             goto err;
 940 
 941         if (op->cmd == add_cmd)
 942             for (n = op->T2 - op->T1 + 1; n != 0; n--)
 943                 printer (ctx, DEL_CH, 0, 0, 1, "\n");
 944 
 945         if (op->cmd == del_cmd)
 946         {
 947             for (n = op->F2 - op->F1 + 1;
 948                  n != 0 && printer_for (ADD_CH, printer, ctx, f, &line, &off); n--)
 949                 ;
 950 
 951             if (n != 0)
 952                 goto err;
 953         }
 954 
 955         if (op->cmd == 'c')
 956         {
 957             for (n = op->F2 - op->F1 + 1;
 958                  n != 0 && printer_for (CHG_CH, printer, ctx, f, &line, &off); n--)
 959                 ;
 960 
 961             if (n != 0)
 962                 goto err;
 963 
 964             for (n = op->T2 - op->T1 - (op->F2 - op->F1); n > 0; n--)
 965                 printer (ctx, CHG_CH, 0, 0, 1, "\n");
 966         }
 967     }
 968 #undef T2
 969 #undef T1
 970 #undef F2
 971 #undef F1
 972 
 973     while (printer_for (EQU_CH, printer, ctx, f, &line, &off))
 974         ;
 975 
 976     dview_fclose (f);
 977     return 0;
 978 
 979   err:
 980     dview_fclose (f);
 981     return -1;
 982 }
 983 
 984 /* --------------------------------------------------------------------------------------------- */
 985 
 986 /* horizontal diff ********************************************************** */
 987 
 988 /**
 989  * Longest common substring.
 990  *
 991  * @param s first string
 992  * @param m length of first string
 993  * @param t second string
 994  * @param n length of second string
 995  * @param ret list of offsets for longest common substrings inside each string
 996  * @param min minimum length of common substrings
 997  *
 998  * @return 0 if success, nonzero otherwise
 999  */
1000 
1001 static int
1002 lcsubstr (const char *s, int m, const char *t, int n, GArray *ret, int min)
     /*   */
1003 {
1004     int i, j;
1005     int *Lprev, *Lcurr;
1006     int z = 0;
1007 
1008     if (m < min || n < min)
1009     {
1010         /* XXX early culling */
1011         return 0;
1012     }
1013 
1014     Lprev = g_try_new0 (int, n + 1);
1015     if (Lprev == NULL)
1016         return -1;
1017 
1018     Lcurr = g_try_new0 (int, n + 1);
1019     if (Lcurr == NULL)
1020     {
1021         g_free (Lprev);
1022         return -1;
1023     }
1024 
1025     for (i = 0; i < m; i++)
1026     {
1027         int *L;
1028 
1029         L = Lprev;
1030         Lprev = Lcurr;
1031         Lcurr = L;
1032 #ifdef USE_MEMSET_IN_LCS
1033         memset (Lcurr, 0, (n + 1) * sizeof (*Lcurr));
1034 #endif
1035         for (j = 0; j < n; j++)
1036         {
1037 #ifndef USE_MEMSET_IN_LCS
1038             Lcurr[j + 1] = 0;
1039 #endif
1040             if (s[i] == t[j])
1041             {
1042                 int v;
1043 
1044                 v = Lprev[j] + 1;
1045                 Lcurr[j + 1] = v;
1046                 if (z < v)
1047                 {
1048                     z = v;
1049                     g_array_set_size (ret, 0);
1050                 }
1051                 if (z == v && z >= min)
1052                 {
1053                     int off0, off1;
1054                     size_t k;
1055 
1056                     off0 = i - z + 1;
1057                     off1 = j - z + 1;
1058 
1059                     for (k = 0; k < ret->len; k++)
1060                     {
1061                         PAIR *p = (PAIR *) g_array_index (ret, PAIR, k);
1062                         if ((*p)[0] == off0 || (*p)[1] >= off1)
1063                             break;
1064                     }
1065                     if (k == ret->len)
1066                     {
1067                         PAIR p2;
1068 
1069                         p2[0] = off0;
1070                         p2[1] = off1;
1071                         g_array_append_val (ret, p2);
1072                     }
1073                 }
1074             }
1075         }
1076     }
1077 
1078     g_free (Lcurr);
1079     g_free (Lprev);
1080     return z;
1081 }
1082 
1083 /* --------------------------------------------------------------------------------------------- */
1084 
1085 /**
1086  * Scan recursively for common substrings and build ranges.
1087  *
1088  * @param s first string
1089  * @param t second string
1090  * @param bracket current limits for both of the strings
1091  * @param min minimum length of common substrings
1092  * @param hdiff list of horizontal diff ranges to fill
1093  * @param depth recursion depth
1094  *
1095  * @return 0 if success, nonzero otherwise
1096  */
1097 
1098 static gboolean
1099 hdiff_multi (const char *s, const char *t, const BRACKET bracket, int min, GArray *hdiff,
     /*   */
1100              unsigned int depth)
1101 {
1102     BRACKET p;
1103 
1104     if (depth-- != 0)
1105     {
1106         GArray *ret;
1107         BRACKET b;
1108         int len;
1109 
1110         ret = g_array_new (FALSE, TRUE, sizeof (PAIR));
1111 
1112         len = lcsubstr (s + bracket[DIFF_LEFT].off, bracket[DIFF_LEFT].len,
1113                         t + bracket[DIFF_RIGHT].off, bracket[DIFF_RIGHT].len, ret, min);
1114         if (ret->len != 0)
1115         {
1116             size_t k = 0;
1117             const PAIR *data = (const PAIR *) &g_array_index (ret, PAIR, 0);
1118             const PAIR *data2;
1119 
1120             b[DIFF_LEFT].off = bracket[DIFF_LEFT].off;
1121             b[DIFF_LEFT].len = (*data)[0];
1122             b[DIFF_RIGHT].off = bracket[DIFF_RIGHT].off;
1123             b[DIFF_RIGHT].len = (*data)[1];
1124             if (!hdiff_multi (s, t, b, min, hdiff, depth))
1125                 return FALSE;
1126 
1127             for (k = 0; k < ret->len - 1; k++)
1128             {
1129                 data = (const PAIR *) &g_array_index (ret, PAIR, k);
1130                 data2 = (const PAIR *) &g_array_index (ret, PAIR, k + 1);
1131                 b[DIFF_LEFT].off = bracket[DIFF_LEFT].off + (*data)[0] + len;
1132                 b[DIFF_LEFT].len = (*data2)[0] - (*data)[0] - len;
1133                 b[DIFF_RIGHT].off = bracket[DIFF_RIGHT].off + (*data)[1] + len;
1134                 b[DIFF_RIGHT].len = (*data2)[1] - (*data)[1] - len;
1135                 if (!hdiff_multi (s, t, b, min, hdiff, depth))
1136                     return FALSE;
1137             }
1138             data = (const PAIR *) &g_array_index (ret, PAIR, k);
1139             b[DIFF_LEFT].off = bracket[DIFF_LEFT].off + (*data)[0] + len;
1140             b[DIFF_LEFT].len = bracket[DIFF_LEFT].len - (*data)[0] - len;
1141             b[DIFF_RIGHT].off = bracket[DIFF_RIGHT].off + (*data)[1] + len;
1142             b[DIFF_RIGHT].len = bracket[DIFF_RIGHT].len - (*data)[1] - len;
1143             if (!hdiff_multi (s, t, b, min, hdiff, depth))
1144                 return FALSE;
1145 
1146             g_array_free (ret, TRUE);
1147             return TRUE;
1148         }
1149     }
1150 
1151     p[DIFF_LEFT].off = bracket[DIFF_LEFT].off;
1152     p[DIFF_LEFT].len = bracket[DIFF_LEFT].len;
1153     p[DIFF_RIGHT].off = bracket[DIFF_RIGHT].off;
1154     p[DIFF_RIGHT].len = bracket[DIFF_RIGHT].len;
1155     g_array_append_val (hdiff, p);
1156 
1157     return TRUE;
1158 }
1159 
1160 /* --------------------------------------------------------------------------------------------- */
1161 
1162 /**
1163  * Build list of horizontal diff ranges.
1164  *
1165  * @param s first string
1166  * @param m length of first string
1167  * @param t second string
1168  * @param n length of second string
1169  * @param min minimum length of common substrings
1170  * @param hdiff list of horizontal diff ranges to fill
1171  * @param depth recursion depth
1172  *
1173  * @return 0 if success, nonzero otherwise
1174  */
1175 
1176 static gboolean
1177 hdiff_scan (const char *s, int m, const char *t, int n, int min, GArray *hdiff, unsigned int depth)
     /*   */
1178 {
1179     int i;
1180     BRACKET b;
1181 
1182     /* dumbscan (single horizontal diff) -- does not compress whitespace */
1183     for (i = 0; i < m && i < n && s[i] == t[i]; i++)
1184         ;
1185     for (; m > i && n > i && s[m - 1] == t[n - 1]; m--, n--)
1186         ;
1187 
1188     b[DIFF_LEFT].off = i;
1189     b[DIFF_LEFT].len = m - i;
1190     b[DIFF_RIGHT].off = i;
1191     b[DIFF_RIGHT].len = n - i;
1192 
1193     /* smartscan (multiple horizontal diff) */
1194     return hdiff_multi (s, t, b, min, hdiff, depth);
1195 }
1196 
1197 /* --------------------------------------------------------------------------------------------- */
1198 
1199 /* read line **************************************************************** */
1200 
1201 /**
1202  * Check if character is inside horizontal diff limits.
1203  *
1204  * @param k rank of character inside line
1205  * @param hdiff horizontal diff structure
1206  * @param ord DIFF_LEFT if reading from first file, DIFF_RIGHT if reading from 2nd file
1207  *
1208  * @return TRUE if inside hdiff limits, FALSE otherwise
1209  */
1210 
1211 static gboolean
1212 is_inside (int k, GArray *hdiff, diff_place_t ord)
     /*   */
1213 {
1214     size_t i;
1215     BRACKET *b;
1216 
1217     for (i = 0; i < hdiff->len; i++)
1218     {
1219         int start, end;
1220 
1221         b = &g_array_index (hdiff, BRACKET, i);
1222         start = (*b)[ord].off;
1223         end = start + (*b)[ord].len;
1224         if (k >= start && k < end)
1225             return TRUE;
1226     }
1227     return FALSE;
1228 }
1229 
1230 /* --------------------------------------------------------------------------------------------- */
1231 
1232 /**
1233  * Copy 'src' to 'dst' expanding tabs.
1234  * @note The procedure returns when all bytes are consumed from 'src'
1235  *
1236  * @param dst destination buffer
1237  * @param src source buffer
1238  * @param srcsize size of src buffer
1239  * @param base virtual base of this string, needed to calculate tabs
1240  * @param ts tab size
1241  *
1242  * @return new virtual base
1243  */
1244 
1245 static int
1246 cvt_cpy (char *dst, const char *src, size_t srcsize, int base, int ts)
     /*   */
1247 {
1248     int i;
1249 
1250     for (i = 0; srcsize != 0; i++, src++, dst++, srcsize--)
1251     {
1252         *dst = *src;
1253         if (*src == '\t')
1254         {
1255             int j;
1256 
1257             j = TAB_SKIP (ts, i + base);
1258             i += j - 1;
1259             fill_by_space (dst, j, FALSE);
1260             dst += j - 1;
1261         }
1262     }
1263     return i + base;
1264 }
1265 
1266 /* --------------------------------------------------------------------------------------------- */
1267 
1268 /**
1269  * Copy 'src' to 'dst' expanding tabs.
1270  *
1271  * @param dst destination buffer
1272  * @param dstsize size of dst buffer
1273  * @param[in,out] _src source buffer
1274  * @param srcsize size of src buffer
1275  * @param base virtual base of this string, needed to calculate tabs
1276  * @param ts tab size
1277  *
1278  * @return new virtual base
1279  *
1280  * @note The procedure returns when all bytes are consumed from 'src'
1281  *       or 'dstsize' bytes are written to 'dst'
1282  * @note Upon return, 'src' points to the first unwritten character in source
1283  */
1284 
1285 static int
1286 cvt_ncpy (char *dst, int dstsize, const char **_src, size_t srcsize, int base, int ts)
     /*   */
1287 {
1288     int i;
1289     const char *src = *_src;
1290 
1291     for (i = 0; i < dstsize && srcsize != 0; i++, src++, dst++, srcsize--)
1292     {
1293         *dst = *src;
1294         if (*src == '\t')
1295         {
1296             int j;
1297 
1298             j = TAB_SKIP (ts, i + base);
1299             if (j > dstsize - i)
1300                 j = dstsize - i;
1301             i += j - 1;
1302             fill_by_space (dst, j, FALSE);
1303             dst += j - 1;
1304         }
1305     }
1306     *_src = src;
1307     return i + base;
1308 }
1309 
1310 /* --------------------------------------------------------------------------------------------- */
1311 
1312 /**
1313  * Read line from memory, converting tabs to spaces and padding with spaces.
1314  *
1315  * @param src buffer to read from
1316  * @param srcsize size of src buffer
1317  * @param dst buffer to read to
1318  * @param dstsize size of dst buffer, excluding trailing null
1319  * @param skip number of characters to skip
1320  * @param ts tab size
1321  * @param show_cr show trailing carriage return as ^M
1322  *
1323  * @return negative on error, otherwise number of bytes except padding
1324  */
1325 
1326 static int
1327 cvt_mget (const char *src, size_t srcsize, char *dst, int dstsize, int skip, int ts,
     /*   */
1328           gboolean show_cr)
1329 {
1330     int sz = 0;
1331 
1332     if (src != NULL)
1333     {
1334         int i;
1335         char *tmp = dst;
1336         const int base = 0;
1337 
1338         for (i = 0; dstsize != 0 && srcsize != 0 && *src != '\n'; i++, src++, srcsize--)
1339         {
1340             if (*src == '\t')
1341             {
1342                 int j;
1343 
1344                 j = TAB_SKIP (ts, i + base);
1345                 i += j - 1;
1346                 while (j-- > 0)
1347                 {
1348                     if (skip > 0)
1349                         skip--;
1350                     else if (dstsize != 0)
1351                     {
1352                         dstsize--;
1353                         *dst++ = ' ';
1354                     }
1355                 }
1356             }
1357             else if (src[0] == '\r' && (srcsize == 1 || src[1] == '\n'))
1358             {
1359                 if (skip == 0 && show_cr)
1360                 {
1361                     if (dstsize > 1)
1362                     {
1363                         dstsize -= 2;
1364                         *dst++ = '^';
1365                         *dst++ = 'M';
1366                     }
1367                     else
1368                     {
1369                         dstsize--;
1370                         *dst++ = '.';
1371                     }
1372                 }
1373                 break;
1374             }
1375             else if (skip > 0)
1376             {
1377 #ifdef HAVE_CHARSET
1378                 int ch = 0;
1379                 int ch_length = 1;
1380 
1381                 (void) dview_get_utf (src, &ch, &ch_length);
1382 
1383                 if (ch_length > 1)
1384                     skip += ch_length - 1;
1385 #endif
1386 
1387                 skip--;
1388             }
1389             else
1390             {
1391                 dstsize--;
1392                 *dst++ = *src;
1393             }
1394         }
1395         sz = dst - tmp;
1396     }
1397 
1398     fill_by_space (dst, dstsize, TRUE);
1399 
1400     return sz;
1401 }
1402 
1403 /* --------------------------------------------------------------------------------------------- */
1404 
1405 /**
1406  * Read line from memory and build attribute array.
1407  *
1408  * @param src buffer to read from
1409  * @param srcsize size of src buffer
1410  * @param dst buffer to read to
1411  * @param dstsize size of dst buffer, excluding trailing null
1412  * @param skip number of characters to skip
1413  * @param ts tab size
1414  * @param show_cr show trailing carriage return as ^M
1415  * @param hdiff horizontal diff structure
1416  * @param ord DIFF_LEFT if reading from first file, DIFF_RIGHT if reading from 2nd file
1417  * @param att buffer of attributes
1418  *
1419  * @return negative on error, otherwise number of bytes except padding
1420  */
1421 
1422 static int
1423 cvt_mgeta (const char *src, size_t srcsize, char *dst, int dstsize, int skip, int ts,
     /*   */
1424            gboolean show_cr, GArray *hdiff, diff_place_t ord, char *att)
1425 {
1426     int sz = 0;
1427 
1428     if (src != NULL)
1429     {
1430         int i, k;
1431         char *tmp = dst;
1432         const int base = 0;
1433 
1434         for (i = 0, k = 0; dstsize != 0 && srcsize != 0 && *src != '\n'; i++, k++, src++, srcsize--)
1435         {
1436             if (*src == '\t')
1437             {
1438                 int j;
1439 
1440                 j = TAB_SKIP (ts, i + base);
1441                 i += j - 1;
1442                 while (j-- > 0)
1443                 {
1444                     if (skip != 0)
1445                         skip--;
1446                     else if (dstsize != 0)
1447                     {
1448                         dstsize--;
1449                         *att++ = is_inside (k, hdiff, ord);
1450                         *dst++ = ' ';
1451                     }
1452                 }
1453             }
1454             else if (src[0] == '\r' && (srcsize == 1 || src[1] == '\n'))
1455             {
1456                 if (skip == 0 && show_cr)
1457                 {
1458                     if (dstsize > 1)
1459                     {
1460                         dstsize -= 2;
1461                         *att++ = is_inside (k, hdiff, ord);
1462                         *dst++ = '^';
1463                         *att++ = is_inside (k, hdiff, ord);
1464                         *dst++ = 'M';
1465                     }
1466                     else
1467                     {
1468                         dstsize--;
1469                         *att++ = is_inside (k, hdiff, ord);
1470                         *dst++ = '.';
1471                     }
1472                 }
1473                 break;
1474             }
1475             else if (skip != 0)
1476             {
1477 #ifdef HAVE_CHARSET
1478                 int ch = 0;
1479                 int ch_length = 1;
1480 
1481                 (void) dview_get_utf (src, &ch, &ch_length);
1482                 if (ch_length > 1)
1483                     skip += ch_length - 1;
1484 #endif
1485 
1486                 skip--;
1487             }
1488             else
1489             {
1490                 dstsize--;
1491                 *att++ = is_inside (k, hdiff, ord);
1492                 *dst++ = *src;
1493             }
1494         }
1495         sz = dst - tmp;
1496     }
1497 
1498     memset (att, '\0', dstsize);
1499     fill_by_space (dst, dstsize, TRUE);
1500 
1501     return sz;
1502 }
1503 
1504 /* --------------------------------------------------------------------------------------------- */
1505 
1506 /**
1507  * Read line from file, converting tabs to spaces and padding with spaces.
1508  *
1509  * @param f file stream to read from
1510  * @param off offset of line inside file
1511  * @param dst buffer to read to
1512  * @param dstsize size of dst buffer, excluding trailing null
1513  * @param skip number of characters to skip
1514  * @param ts tab size
1515  * @param show_cr show trailing carriage return as ^M
1516  *
1517  * @return negative on error, otherwise number of bytes except padding
1518  */
1519 
1520 static int
1521 cvt_fget (FBUF *f, off_t off, char *dst, size_t dstsize, int skip, int ts, gboolean show_cr)
     /*   */
1522 {
1523     int base = 0;
1524     int old_base = base;
1525     size_t amount = dstsize;
1526     size_t useful, offset;
1527     size_t i;
1528     size_t sz;
1529     int lastch = '\0';
1530     const char *q = NULL;
1531     char tmp[BUFSIZ];           /* XXX capacity must be >= MAX{dstsize + 1, amount} */
1532     char cvt[BUFSIZ];           /* XXX capacity must be >= MAX_TAB_WIDTH * amount */
1533 
1534     if (sizeof (tmp) < amount || sizeof (tmp) <= dstsize || sizeof (cvt) < 8 * amount)
1535     {
1536         /* abnormal, but avoid buffer overflow */
1537         fill_by_space (dst, dstsize, TRUE);
1538         return 0;
1539     }
1540 
1541     dview_fseek (f, off, SEEK_SET);
1542 
1543     while (skip > base)
1544     {
1545         old_base = base;
1546         sz = dview_fgets (tmp, amount, f);
1547         if (sz == 0)
1548             break;
1549 
1550         base = cvt_cpy (cvt, tmp, sz, old_base, ts);
1551         if (cvt[base - old_base - 1] == '\n')
1552         {
1553             q = &cvt[base - old_base - 1];
1554             base = old_base + q - cvt + 1;
1555             break;
1556         }
1557     }
1558 
1559     if (base < skip)
1560     {
1561         fill_by_space (dst, dstsize, TRUE);
1562         return 0;
1563     }
1564 
1565     useful = base - skip;
1566     offset = skip - old_base;
1567 
1568     if (useful <= dstsize)
1569     {
1570         if (useful != 0)
1571             memmove (dst, cvt + offset, useful);
1572 
1573         if (q == NULL)
1574         {
1575             sz = dview_fgets (tmp, dstsize - useful + 1, f);
1576             if (sz != 0)
1577             {
1578                 const char *ptr = tmp;
1579 
1580                 useful += cvt_ncpy (dst + useful, dstsize - useful, &ptr, sz, base, ts) - base;
1581                 if (ptr < tmp + sz)
1582                     lastch = *ptr;
1583             }
1584         }
1585         sz = useful;
1586     }
1587     else
1588     {
1589         memmove (dst, cvt + offset, dstsize);
1590         sz = dstsize;
1591         lastch = cvt[offset + dstsize];
1592     }
1593 
1594     dst[sz] = lastch;
1595     for (i = 0; i < sz && dst[i] != '\n'; i++)
1596         if (dst[i] == '\r' && dst[i + 1] == '\n')
1597         {
1598             if (show_cr)
1599             {
1600                 if (i + 1 < dstsize)
1601                 {
1602                     dst[i++] = '^';
1603                     dst[i++] = 'M';
1604                 }
1605                 else
1606                     dst[i++] = '*';
1607             }
1608             break;
1609         }
1610 
1611     fill_by_space (dst, dstsize, TRUE);
1612 
1613     return sz;
1614 }
1615 
1616 /* --------------------------------------------------------------------------------------------- */
1617 /* diff printers et al ****************************************************** */
1618 
1619 static void
1620 cc_free_elt (gpointer elt)
     /*   */
1621 {
1622     DIFFLN *p = (DIFFLN *) elt;
1623 
1624     if (p != NULL)
1625         g_free (p->p);
1626 }
1627 
1628 /* --------------------------------------------------------------------------------------------- */
1629 
1630 static int
1631 printer (void *ctx, int ch, int line, off_t off, size_t sz, const char *str)
     /*   */
1632 {
1633     GArray *a = ((PRINTER_CTX *) ctx)->a;
1634     DSRC dsrc = ((PRINTER_CTX *) ctx)->dsrc;
1635 
1636     if (ch != 0)
1637     {
1638         DIFFLN p;
1639 
1640         p.p = NULL;
1641         p.ch = ch;
1642         p.line = line;
1643         p.u.off = off;
1644         if (dsrc == DATA_SRC_MEM && line != 0)
1645         {
1646             if (sz != 0 && str[sz - 1] == '\n')
1647                 sz--;
1648             if (sz > 0)
1649                 p.p = g_strndup (str, sz);
1650             p.u.len = sz;
1651         }
1652         g_array_append_val (a, p);
1653     }
1654     else if (dsrc == DATA_SRC_MEM)
1655     {
1656         DIFFLN *p;
1657 
1658         p = &g_array_index (a, DIFFLN, a->len - 1);
1659         if (sz != 0 && str[sz - 1] == '\n')
1660             sz--;
1661         if (sz != 0)
1662         {
1663             size_t new_size;
1664             char *q;
1665 
1666             new_size = p->u.len + sz;
1667             q = g_realloc (p->p, new_size);
1668             memcpy (q + p->u.len, str, sz);
1669             p->p = q;
1670         }
1671         p->u.len += sz;
1672     }
1673     if (dsrc == DATA_SRC_TMP && (line != 0 || ch == 0))
1674     {
1675         FBUF *f = ((PRINTER_CTX *) ctx)->f;
1676         dview_fwrite (f, str, sz);
1677     }
1678     return 0;
1679 }
1680 
1681 /* --------------------------------------------------------------------------------------------- */
1682 
1683 static int
1684 redo_diff (WDiff *dview)
     /*   */
1685 {
1686     FBUF *const *f = dview->f;
1687     PRINTER_CTX ctx;
1688     GArray *ops;
1689     int ndiff;
1690     int rv = 0;
1691     char extra[BUF_MEDIUM];
1692 
1693     extra[0] = '\0';
1694     if (dview->opt.quality == 2)
1695         strcat (extra, " -d");
1696     if (dview->opt.quality == 1)
1697         strcat (extra, " --speed-large-files");
1698     if (dview->opt.strip_trailing_cr)
1699         strcat (extra, " --strip-trailing-cr");
1700     if (dview->opt.ignore_tab_expansion)
1701         strcat (extra, " -E");
1702     if (dview->opt.ignore_space_change)
1703         strcat (extra, " -b");
1704     if (dview->opt.ignore_all_space)
1705         strcat (extra, " -w");
1706     if (dview->opt.ignore_case)
1707         strcat (extra, " -i");
1708 
1709     if (dview->dsrc != DATA_SRC_MEM)
1710     {
1711         dview_freset (f[DIFF_LEFT]);
1712         dview_freset (f[DIFF_RIGHT]);
1713     }
1714 
1715     ops = g_array_new (FALSE, FALSE, sizeof (DIFFCMD));
1716     ndiff = dff_execute (dview->args, extra, dview->file[DIFF_LEFT], dview->file[DIFF_RIGHT], ops);
1717     if (ndiff < 0)
1718     {
1719         if (ops != NULL)
1720             g_array_free (ops, TRUE);
1721         return -1;
1722     }
1723 
1724     ctx.dsrc = dview->dsrc;
1725     ctx.a = dview->a[DIFF_LEFT];
1726     ctx.f = f[DIFF_LEFT];
1727     rv |= dff_reparse (DIFF_LEFT, dview->file[DIFF_LEFT], ops, printer, &ctx);
1728 
1729     ctx.a = dview->a[DIFF_RIGHT];
1730     ctx.f = f[DIFF_RIGHT];
1731     rv |= dff_reparse (DIFF_RIGHT, dview->file[DIFF_RIGHT], ops, printer, &ctx);
1732 
1733     if (ops != NULL)
1734         g_array_free (ops, TRUE);
1735 
1736     if (rv != 0 || dview->a[DIFF_LEFT]->len != dview->a[DIFF_RIGHT]->len)
1737         return -1;
1738 
1739     if (dview->dsrc == DATA_SRC_TMP)
1740     {
1741         dview_ftrunc (f[DIFF_LEFT]);
1742         dview_ftrunc (f[DIFF_RIGHT]);
1743     }
1744 
1745     if (dview->dsrc == DATA_SRC_MEM && HDIFF_ENABLE)
1746     {
1747         size_t i;
1748 
1749         dview->hdiff = g_ptr_array_new ();
1750 
1751         for (i = 0; i < dview->a[DIFF_LEFT]->len; i++)
1752         {
1753             GArray *h = NULL;
1754             const DIFFLN *p;
1755             const DIFFLN *q;
1756 
1757             p = &g_array_index (dview->a[DIFF_LEFT], DIFFLN, i);
1758             q = &g_array_index (dview->a[DIFF_RIGHT], DIFFLN, i);
1759             if (p->line != 0 && q->line != 0 && p->ch == CHG_CH)
1760             {
1761                 gboolean runresult;
1762 
1763                 h = g_array_new (FALSE, FALSE, sizeof (BRACKET));
1764 
1765                 runresult =
1766                     hdiff_scan (p->p, p->u.len, q->p, q->u.len, HDIFF_MINCTX, h, HDIFF_DEPTH);
1767                 if (!runresult)
1768                 {
1769                     g_array_free (h, TRUE);
1770                     h = NULL;
1771                 }
1772             }
1773 
1774             g_ptr_array_add (dview->hdiff, h);
1775         }
1776     }
1777     return ndiff;
1778 }
1779 
1780 /* --------------------------------------------------------------------------------------------- */
1781 
1782 static void
1783 destroy_hdiff (WDiff *dview)
     /*   */
1784 {
1785     if (dview->hdiff != NULL)
1786     {
1787         int i;
1788         int len;
1789 
1790         len = dview->a[DIFF_LEFT]->len;
1791 
1792         for (i = 0; i < len; i++)
1793         {
1794             GArray *h;
1795 
1796             h = (GArray *) g_ptr_array_index (dview->hdiff, i);
1797             if (h != NULL)
1798                 g_array_free (h, TRUE);
1799         }
1800         g_ptr_array_free (dview->hdiff, TRUE);
1801         dview->hdiff = NULL;
1802     }
1803 
1804     mc_search_free (dview->search.handle);
1805     dview->search.handle = NULL;
1806     MC_PTR_FREE (dview->search.last_string);
1807 }
1808 
1809 /* --------------------------------------------------------------------------------------------- */
1810 /* stuff ******************************************************************** */
1811 
1812 static int
1813 get_digits (unsigned int n)
     /*   */
1814 {
1815     int d = 1;
1816 
1817     while ((n /= 10) != 0)
1818         d++;
1819     return d;
1820 }
1821 
1822 /* --------------------------------------------------------------------------------------------- */
1823 
1824 static int
1825 get_line_numbers (const GArray *a, size_t pos, int *linenum, int *lineofs)
     /*   */
1826 {
1827     const DIFFLN *p;
1828 
1829     *linenum = 0;
1830     *lineofs = 0;
1831 
1832     if (a->len != 0)
1833     {
1834         if (pos >= a->len)
1835             pos = a->len - 1;
1836 
1837         p = &g_array_index (a, DIFFLN, pos);
1838 
1839         if (p->line == 0)
1840         {
1841             int n;
1842 
1843             for (n = pos; n > 0; n--)
1844             {
1845                 p--;
1846                 if (p->line != 0)
1847                     break;
1848             }
1849             *lineofs = pos - n + 1;
1850         }
1851 
1852         *linenum = p->line;
1853     }
1854     return 0;
1855 }
1856 
1857 /* --------------------------------------------------------------------------------------------- */
1858 
1859 static int
1860 calc_nwidth (const GArray *const *a)
     /*   */
1861 {
1862     int l1, o1;
1863     int l2, o2;
1864 
1865     get_line_numbers (a[DIFF_LEFT], a[DIFF_LEFT]->len - 1, &l1, &o1);
1866     get_line_numbers (a[DIFF_RIGHT], a[DIFF_RIGHT]->len - 1, &l2, &o2);
1867     if (l1 < l2)
1868         l1 = l2;
1869     return get_digits (l1);
1870 }
1871 
1872 /* --------------------------------------------------------------------------------------------- */
1873 
1874 static int
1875 find_prev_hunk (const GArray *a, int pos)
     /*   */
1876 {
1877 #if 1
1878     for (; pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch != EQU_CH; pos--)
1879         ;
1880     for (; pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch == EQU_CH; pos--)
1881         ;
1882     for (; pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch != EQU_CH; pos--)
1883         ;
1884     if (pos > 0 && (size_t) pos < a->len)
1885         pos++;
1886 #else
1887     for (; pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos - 1))->ch == EQU_CH; pos--)
1888         ;
1889     for (; pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos - 1))->ch != EQU_CH; pos--)
1890         ;
1891 #endif
1892 
1893     return pos;
1894 }
1895 
1896 /* --------------------------------------------------------------------------------------------- */
1897 
1898 static size_t
1899 find_next_hunk (const GArray *a, size_t pos)
     /*   */
1900 {
1901     for (; pos < a->len && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch != EQU_CH; pos++)
1902         ;
1903     for (; pos < a->len && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch == EQU_CH; pos++)
1904         ;
1905     return pos;
1906 }
1907 
1908 /* --------------------------------------------------------------------------------------------- */
1909 /**
1910  * Find start and end lines of the current hunk.
1911  *
1912  * @param dview WDiff widget
1913  * @return boolean and
1914  * start_line1 first line of current hunk (file[0])
1915  * end_line1 last line of current hunk (file[0])
1916  * start_line1 first line of current hunk (file[0])
1917  * end_line1 last line of current hunk (file[0])
1918  */
1919 
1920 static int
1921 get_current_hunk (WDiff *dview, int *start_line1, int *end_line1, int *start_line2, int *end_line2)
     /*   */
1922 {
1923     const GArray *a0 = dview->a[DIFF_LEFT];
1924     const GArray *a1 = dview->a[DIFF_RIGHT];
1925     size_t pos;
1926     int ch;
1927     int res = 0;
1928 
1929     *start_line1 = 1;
1930     *start_line2 = 1;
1931     *end_line1 = 1;
1932     *end_line2 = 1;
1933 
1934     pos = dview->skip_rows;
1935     ch = ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->ch;
1936     if (ch != EQU_CH)
1937     {
1938         switch (ch)
1939         {
1940         case ADD_CH:
1941             res = DIFF_DEL;
1942             break;
1943         case DEL_CH:
1944             res = DIFF_ADD;
1945             break;
1946         case CHG_CH:
1947             res = DIFF_CHG;
1948             break;
1949         default:
1950             break;
1951         }
1952 
1953         for (; pos > 0 && ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->ch != EQU_CH; pos--)
1954             ;
1955         if (pos > 0)
1956         {
1957             *start_line1 = ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->line + 1;
1958             *start_line2 = ((DIFFLN *) & g_array_index (a1, DIFFLN, pos))->line + 1;
1959         }
1960 
1961         for (pos = dview->skip_rows;
1962              pos < a0->len && ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->ch != EQU_CH; pos++)
1963         {
1964             int l0, l1;
1965 
1966             l0 = ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->line;
1967             l1 = ((DIFFLN *) & g_array_index (a1, DIFFLN, pos))->line;
1968             if (l0 > 0)
1969                 *end_line1 = MAX (*start_line1, l0);
1970             if (l1 > 0)
1971                 *end_line2 = MAX (*start_line2, l1);
1972         }
1973     }
1974     return res;
1975 }
1976 
1977 /* --------------------------------------------------------------------------------------------- */
1978 /**
1979  * Remove hunk from file.
1980  *
1981  * @param dview           WDiff widget
1982  * @param merge_file      file stream for writing data
1983  * @param from1           first line of hunk
1984  * @param to1             last line of hunk
1985  * @param merge_direction in what direction files should be merged
1986  */
1987 
1988 static void
1989 dview_remove_hunk (WDiff *dview, FILE *merge_file, int from1, int to1,
     /*   */
1990                    action_direction_t merge_direction)
1991 {
1992     int line;
1993     char buf[BUF_10K];
1994     FILE *f0;
1995 
1996     if (merge_direction == FROM_RIGHT_TO_LEFT)
1997         f0 = fopen (dview->file[DIFF_RIGHT], "r");
1998     else
1999         f0 = fopen (dview->file[DIFF_LEFT], "r");
2000 
2001     for (line = 0; fgets (buf, sizeof (buf), f0) != NULL && line < from1 - 1; line++)
2002         fputs (buf, merge_file);
2003 
2004     while (fgets (buf, sizeof (buf), f0) != NULL)
2005     {
2006         line++;
2007         if (line >= to1)
2008             fputs (buf, merge_file);
2009     }
2010     fclose (f0);
2011 }
2012 
2013 /* --------------------------------------------------------------------------------------------- */
2014 /**
2015  * Add hunk to file.
2016  *
2017  * @param dview           WDiff widget
2018  * @param merge_file      file stream for writing data
2019  * @param from1           first line of source hunk
2020  * @param from2           first line of destination hunk
2021  * @param to1             last line of source hunk
2022  * @param merge_direction in what direction files should be merged
2023  */
2024 
2025 static void
2026 dview_add_hunk (WDiff *dview, FILE *merge_file, int from1, int from2, int to2,
     /*   */
2027                 action_direction_t merge_direction)
2028 {
2029     int line;
2030     char buf[BUF_10K];
2031     FILE *f0, *f1;
2032 
2033     if (merge_direction == FROM_RIGHT_TO_LEFT)
2034     {
2035         f0 = fopen (dview->file[DIFF_RIGHT], "r");
2036         f1 = fopen (dview->file[DIFF_LEFT], "r");
2037     }
2038     else
2039     {
2040         f0 = fopen (dview->file[DIFF_LEFT], "r");
2041         f1 = fopen (dview->file[DIFF_RIGHT], "r");
2042     }
2043 
2044     for (line = 0; fgets (buf, sizeof (buf), f0) != NULL && line < from1 - 1; line++)
2045         fputs (buf, merge_file);
2046     for (line = 0; fgets (buf, sizeof (buf), f1) != NULL && line <= to2;)
2047     {
2048         line++;
2049         if (line >= from2)
2050             fputs (buf, merge_file);
2051     }
2052     while (fgets (buf, sizeof (buf), f0) != NULL)
2053         fputs (buf, merge_file);
2054 
2055     fclose (f0);
2056     fclose (f1);
2057 }
2058 
2059 /* --------------------------------------------------------------------------------------------- */
2060 /**
2061  * Replace hunk in file.
2062  *
2063  * @param dview           WDiff widget
2064  * @param merge_file      file stream for writing data
2065  * @param from1           first line of source hunk
2066  * @param to1             last line of source hunk
2067  * @param from2           first line of destination hunk
2068  * @param to2             last line of destination hunk
2069  * @param merge_direction in what direction files should be merged
2070  */
2071 
2072 static void
2073 dview_replace_hunk (WDiff *dview, FILE *merge_file, int from1, int to1, int from2, int to2,
     /*   */
2074                     action_direction_t merge_direction)
2075 {
2076     int line1, line2;
2077     char buf[BUF_10K];
2078     FILE *f0, *f1;
2079 
2080     if (merge_direction == FROM_RIGHT_TO_LEFT)
2081     {
2082         f0 = fopen (dview->file[DIFF_RIGHT], "r");
2083         f1 = fopen (dview->file[DIFF_LEFT], "r");
2084     }
2085     else
2086     {
2087         f0 = fopen (dview->file[DIFF_LEFT], "r");
2088         f1 = fopen (dview->file[DIFF_RIGHT], "r");
2089     }
2090 
2091     for (line1 = 0; fgets (buf, sizeof (buf), f0) != NULL && line1 < from1 - 1; line1++)
2092         fputs (buf, merge_file);
2093     for (line2 = 0; fgets (buf, sizeof (buf), f1) != NULL && line2 <= to2;)
2094     {
2095         line2++;
2096         if (line2 >= from2)
2097             fputs (buf, merge_file);
2098     }
2099     while (fgets (buf, sizeof (buf), f0) != NULL)
2100     {
2101         line1++;
2102         if (line1 > to1)
2103             fputs (buf, merge_file);
2104     }
2105     fclose (f0);
2106     fclose (f1);
2107 }
2108 
2109 /* --------------------------------------------------------------------------------------------- */
2110 /**
2111  * Merge hunk.
2112  *
2113  * @param dview           WDiff widget
2114  * @param merge_direction in what direction files should be merged
2115  */
2116 
2117 static void
2118 do_merge_hunk (WDiff *dview, action_direction_t merge_direction)
     /*   */
2119 {
2120     int from1, to1, from2, to2;
2121     int hunk;
2122     diff_place_t n_merge = (merge_direction == FROM_RIGHT_TO_LEFT) ? DIFF_RIGHT : DIFF_LEFT;
2123 
2124     if (merge_direction == FROM_RIGHT_TO_LEFT)
2125         hunk = get_current_hunk (dview, &from2, &to2, &from1, &to1);
2126     else
2127         hunk = get_current_hunk (dview, &from1, &to1, &from2, &to2);
2128 
2129     if (hunk > 0)
2130     {
2131         int merge_file_fd;
2132         FILE *merge_file;
2133         vfs_path_t *merge_file_name_vpath = NULL;
2134 
2135         if (!dview->merged[n_merge])
2136         {
2137             dview->merged[n_merge] = mc_util_make_backup_if_possible (dview->file[n_merge], "~~~");
2138             if (!dview->merged[n_merge])
2139             {
2140                 message (D_ERROR, MSG_ERROR,
2141                          _("Cannot create backup file\n%s%s\n%s"),
2142                          dview->file[n_merge], "~~~", unix_error_string (errno));
2143                 return;
2144             }
2145         }
2146 
2147         merge_file_fd = mc_mkstemps (&merge_file_name_vpath, "mcmerge", NULL);
2148         if (merge_file_fd == -1)
2149         {
2150             message (D_ERROR, MSG_ERROR, _("Cannot create temporary merge file\n%s"),
2151                      unix_error_string (errno));
2152             return;
2153         }
2154 
2155         merge_file = fdopen (merge_file_fd, "w");
2156 
2157         switch (hunk)
2158         {
2159         case DIFF_DEL:
2160             if (merge_direction == FROM_RIGHT_TO_LEFT)
2161                 dview_add_hunk (dview, merge_file, from1, from2, to2, FROM_RIGHT_TO_LEFT);
2162             else
2163                 dview_remove_hunk (dview, merge_file, from1, to1, FROM_LEFT_TO_RIGHT);
2164             break;
2165         case DIFF_ADD:
2166             if (merge_direction == FROM_RIGHT_TO_LEFT)
2167                 dview_remove_hunk (dview, merge_file, from1, to1, FROM_RIGHT_TO_LEFT);
2168             else
2169                 dview_add_hunk (dview, merge_file, from1, from2, to2, FROM_LEFT_TO_RIGHT);
2170             break;
2171         case DIFF_CHG:
2172             dview_replace_hunk (dview, merge_file, from1, to1, from2, to2, merge_direction);
2173             break;
2174         default:
2175             break;
2176         }
2177         fflush (merge_file);
2178         fclose (merge_file);
2179         {
2180             int res;
2181 
2182             res = rewrite_backup_content (merge_file_name_vpath, dview->file[n_merge]);
2183             (void) res;
2184         }
2185         mc_unlink (merge_file_name_vpath);
2186         vfs_path_free (merge_file_name_vpath, TRUE);
2187     }
2188 }
2189 
2190 /* --------------------------------------------------------------------------------------------- */
2191 /* view routines and callbacks ********************************************** */
2192 
2193 static void
2194 dview_compute_split (WDiff *dview, int i)
     /*   */
2195 {
2196     dview->bias += i;
2197     if (dview->bias < 2 - dview->half1)
2198         dview->bias = 2 - dview->half1;
2199     if (dview->bias > dview->half2 - 2)
2200         dview->bias = dview->half2 - 2;
2201 }
2202 
2203 /* --------------------------------------------------------------------------------------------- */
2204 
2205 static void
2206 dview_compute_areas (WDiff *dview)
     /*   */
2207 {
2208     Widget *w = WIDGET (dview);
2209 
2210     dview->height = w->rect.lines - 1;
2211     dview->half1 = w->rect.cols / 2;
2212     dview->half2 = w->rect.cols - dview->half1;
2213 
2214     dview_compute_split (dview, 0);
2215 }
2216 
2217 /* --------------------------------------------------------------------------------------------- */
2218 
2219 static void
2220 dview_reread (WDiff *dview)
     /*   */
2221 {
2222     int ndiff;
2223 
2224     destroy_hdiff (dview);
2225     if (dview->a[DIFF_LEFT] != NULL)
2226         g_array_free (dview->a[DIFF_LEFT], TRUE);
2227     if (dview->a[DIFF_RIGHT] != NULL)
2228         g_array_free (dview->a[DIFF_RIGHT], TRUE);
2229 
2230     dview->a[DIFF_LEFT] = g_array_new (FALSE, FALSE, sizeof (DIFFLN));
2231     g_array_set_clear_func (dview->a[DIFF_LEFT], cc_free_elt);
2232     dview->a[DIFF_RIGHT] = g_array_new (FALSE, FALSE, sizeof (DIFFLN));
2233     g_array_set_clear_func (dview->a[DIFF_RIGHT], cc_free_elt);
2234 
2235     ndiff = redo_diff (dview);
2236     if (ndiff >= 0)
2237         dview->ndiff = ndiff;
2238 }
2239 
2240 /* --------------------------------------------------------------------------------------------- */
2241 
2242 #ifdef HAVE_CHARSET
2243 static void
2244 dview_set_codeset (WDiff *dview)
     /*   */
2245 {
2246     const char *encoding_id = NULL;
2247 
2248     dview->utf8 = TRUE;
2249     encoding_id =
2250         get_codepage_id (mc_global.source_codepage >=
2251                          0 ? mc_global.source_codepage : mc_global.display_codepage);
2252     if (encoding_id != NULL)
2253     {
2254         GIConv conv;
2255 
2256         conv = str_crt_conv_from (encoding_id);
2257         if (conv != INVALID_CONV)
2258         {
2259             if (dview->converter != str_cnv_from_term)
2260                 str_close_conv (dview->converter);
2261             dview->converter = conv;
2262         }
2263         dview->utf8 = (gboolean) str_isutf8 (encoding_id);
2264     }
2265 }
2266 
2267 /* --------------------------------------------------------------------------------------------- */
2268 
2269 static void
2270 dview_select_encoding (WDiff *dview)
     /*   */
2271 {
2272     if (do_select_codepage ())
2273         dview_set_codeset (dview);
2274     dview_reread (dview);
2275     tty_touch_screen ();
2276     repaint_screen ();
2277 }
2278 #endif /* HAVE_CHARSET */
2279 
2280 /* --------------------------------------------------------------------------------------------- */
2281 
2282 static void
2283 dview_load_options (WDiff *dview)
     /*   */
2284 {
2285     gboolean show_numbers;
2286     int tab_size;
2287 
2288     dview->display_symbols =
2289         mc_config_get_bool (mc_global.main_config, "DiffView", "show_symbols", FALSE);
2290     show_numbers = mc_config_get_bool (mc_global.main_config, "DiffView", "show_numbers", FALSE);
2291     if (show_numbers)
2292         dview->display_numbers = 1;
2293     tab_size = mc_config_get_int (mc_global.main_config, "DiffView", "tab_size", 8);
2294     if (tab_size > 0 && tab_size < 9)
2295         dview->tab_size = tab_size;
2296     else
2297         dview->tab_size = 8;
2298 
2299     dview->opt.quality = mc_config_get_int (mc_global.main_config, "DiffView", "diff_quality", 0);
2300 
2301     dview->opt.strip_trailing_cr =
2302         mc_config_get_bool (mc_global.main_config, "DiffView", "diff_ignore_tws", FALSE);
2303     dview->opt.ignore_all_space =
2304         mc_config_get_bool (mc_global.main_config, "DiffView", "diff_ignore_all_space", FALSE);
2305     dview->opt.ignore_space_change =
2306         mc_config_get_bool (mc_global.main_config, "DiffView", "diff_ignore_space_change", FALSE);
2307     dview->opt.ignore_tab_expansion =
2308         mc_config_get_bool (mc_global.main_config, "DiffView", "diff_tab_expansion", FALSE);
2309     dview->opt.ignore_case =
2310         mc_config_get_bool (mc_global.main_config, "DiffView", "diff_ignore_case", FALSE);
2311 
2312     dview->new_frame = TRUE;
2313 }
2314 
2315 /* --------------------------------------------------------------------------------------------- */
2316 
2317 static void
2318 dview_save_options (WDiff *dview)
     /*   */
2319 {
2320     mc_config_set_bool (mc_global.main_config, "DiffView", "show_symbols", dview->display_symbols);
2321     mc_config_set_bool (mc_global.main_config, "DiffView", "show_numbers",
2322                         dview->display_numbers != 0);
2323     mc_config_set_int (mc_global.main_config, "DiffView", "tab_size", dview->tab_size);
2324 
2325     mc_config_set_int (mc_global.main_config, "DiffView", "diff_quality", dview->opt.quality);
2326 
2327     mc_config_set_bool (mc_global.main_config, "DiffView", "diff_ignore_tws",
2328                         dview->opt.strip_trailing_cr);
2329     mc_config_set_bool (mc_global.main_config, "DiffView", "diff_ignore_all_space",
2330                         dview->opt.ignore_all_space);
2331     mc_config_set_bool (mc_global.main_config, "DiffView", "diff_ignore_space_change",
2332                         dview->opt.ignore_space_change);
2333     mc_config_set_bool (mc_global.main_config, "DiffView", "diff_tab_expansion",
2334                         dview->opt.ignore_tab_expansion);
2335     mc_config_set_bool (mc_global.main_config, "DiffView", "diff_ignore_case",
2336                         dview->opt.ignore_case);
2337 }
2338 
2339 /* --------------------------------------------------------------------------------------------- */
2340 
2341 static void
2342 dview_diff_options (WDiff *dview)
     /*   */
2343 {
2344     const char *quality_str[] = {
2345         N_("No&rmal"),
2346         N_("&Fastest (Assume large files)"),
2347         N_("&Minimal (Find a smaller set of change)")
2348     };
2349 
2350     quick_widget_t quick_widgets[] = {
2351         /* *INDENT-OFF* */
2352         QUICK_START_GROUPBOX (N_("Diff algorithm")),
2353             QUICK_RADIO (3, (const char **) quality_str, (int *) &dview->opt.quality, NULL),
2354         QUICK_STOP_GROUPBOX,
2355         QUICK_START_GROUPBOX (N_("Diff extra options")),
2356             QUICK_CHECKBOX (N_("&Ignore case"), &dview->opt.ignore_case, NULL),
2357             QUICK_CHECKBOX (N_("Ignore tab &expansion"), &dview->opt.ignore_tab_expansion, NULL),
2358             QUICK_CHECKBOX (N_("Ignore &space change"), &dview->opt.ignore_space_change, NULL),
2359             QUICK_CHECKBOX (N_("Ignore all &whitespace"), &dview->opt.ignore_all_space, NULL),
2360             QUICK_CHECKBOX (N_("Strip &trailing carriage return"), &dview->opt.strip_trailing_cr,
2361                             NULL),
2362         QUICK_STOP_GROUPBOX,
2363         QUICK_BUTTONS_OK_CANCEL,
2364         QUICK_END
2365         /* *INDENT-ON* */
2366     };
2367 
2368     WRect r = { -1, -1, 0, 56 };
2369 
2370     quick_dialog_t qdlg = {
2371         r, N_("Diff Options"), "[Diff Options]",
2372         quick_widgets, NULL, NULL
2373     };
2374 
2375     if (quick_dialog (&qdlg) != B_CANCEL)
2376         dview_reread (dview);
2377 }
2378 
2379 /* --------------------------------------------------------------------------------------------- */
2380 
2381 static int
2382 dview_init (WDiff *dview, const char *args, const char *file1, const char *file2,
     /*   */
2383             const char *label1, const char *label2, DSRC dsrc)
2384 {
2385     FBUF *f[DIFF_COUNT];
2386 
2387     f[DIFF_LEFT] = NULL;
2388     f[DIFF_RIGHT] = NULL;
2389 
2390     if (dsrc == DATA_SRC_TMP)
2391     {
2392         f[DIFF_LEFT] = dview_ftemp ();
2393         if (f[DIFF_LEFT] == NULL)
2394             return -1;
2395 
2396         f[DIFF_RIGHT] = dview_ftemp ();
2397         if (f[DIFF_RIGHT] == NULL)
2398         {
2399             dview_fclose (f[DIFF_LEFT]);
2400             return -1;
2401         }
2402     }
2403     else if (dsrc == DATA_SRC_ORG)
2404     {
2405         f[DIFF_LEFT] = dview_fopen (file1, O_RDONLY);
2406         if (f[DIFF_LEFT] == NULL)
2407             return -1;
2408 
2409         f[DIFF_RIGHT] = dview_fopen (file2, O_RDONLY);
2410         if (f[DIFF_RIGHT] == NULL)
2411         {
2412             dview_fclose (f[DIFF_LEFT]);
2413             return -1;
2414         }
2415     }
2416 
2417     dview->view_quit = FALSE;
2418 
2419     dview->bias = 0;
2420     dview->new_frame = TRUE;
2421     dview->skip_rows = 0;
2422     dview->skip_cols = 0;
2423     dview->display_symbols = FALSE;
2424     dview->display_numbers = 0;
2425     dview->show_cr = TRUE;
2426     dview->tab_size = 8;
2427     dview->ord = DIFF_LEFT;
2428     dview->full = FALSE;
2429 
2430     dview->search.handle = NULL;
2431     dview->search.last_string = NULL;
2432     dview->search.last_found_line = -1;
2433     dview->search.last_accessed_num_line = -1;
2434 
2435     dview_load_options (dview);
2436 
2437     dview->args = args;
2438     dview->file[DIFF_LEFT] = file1;
2439     dview->file[DIFF_RIGHT] = file2;
2440     dview->label[DIFF_LEFT] = g_strdup (label1);
2441     dview->label[DIFF_RIGHT] = g_strdup (label2);
2442     dview->f[DIFF_LEFT] = f[0];
2443     dview->f[DIFF_RIGHT] = f[1];
2444     dview->merged[DIFF_LEFT] = FALSE;
2445     dview->merged[DIFF_RIGHT] = FALSE;
2446     dview->hdiff = NULL;
2447     dview->dsrc = dsrc;
2448 #ifdef HAVE_CHARSET
2449     dview->converter = str_cnv_from_term;
2450     dview_set_codeset (dview);
2451 #endif
2452     dview->a[DIFF_LEFT] = g_array_new (FALSE, FALSE, sizeof (DIFFLN));
2453     g_array_set_clear_func (dview->a[DIFF_LEFT], cc_free_elt);
2454     dview->a[DIFF_RIGHT] = g_array_new (FALSE, FALSE, sizeof (DIFFLN));
2455     g_array_set_clear_func (dview->a[DIFF_RIGHT], cc_free_elt);
2456 
2457     return 0;
2458 }
2459 
2460 /* --------------------------------------------------------------------------------------------- */
2461 
2462 static void
2463 dview_fini (WDiff *dview)
     /*   */
2464 {
2465     if (dview->dsrc != DATA_SRC_MEM)
2466     {
2467         dview_fclose (dview->f[DIFF_RIGHT]);
2468         dview_fclose (dview->f[DIFF_LEFT]);
2469     }
2470 
2471 #ifdef HAVE_CHARSET
2472     if (dview->converter != str_cnv_from_term)
2473         str_close_conv (dview->converter);
2474 #endif
2475 
2476     destroy_hdiff (dview);
2477     if (dview->a[DIFF_LEFT] != NULL)
2478     {
2479         g_array_free (dview->a[DIFF_LEFT], TRUE);
2480         dview->a[DIFF_LEFT] = NULL;
2481     }
2482     if (dview->a[DIFF_RIGHT] != NULL)
2483     {
2484         g_array_free (dview->a[DIFF_RIGHT], TRUE);
2485         dview->a[DIFF_RIGHT] = NULL;
2486     }
2487 
2488     g_free (dview->label[DIFF_LEFT]);
2489     g_free (dview->label[DIFF_RIGHT]);
2490 }
2491 
2492 /* --------------------------------------------------------------------------------------------- */
2493 
2494 static int
2495 dview_display_file (const WDiff *dview, diff_place_t ord, int r, int c, int height, int width)
     /*   */
2496 {
2497     size_t i, k;
2498     int j;
2499     char buf[BUFSIZ];
2500     FBUF *f = dview->f[ord];
2501     int skip = dview->skip_cols;
2502     gboolean display_symbols = dview->display_symbols;
2503     int display_numbers = dview->display_numbers;
2504     gboolean show_cr = dview->show_cr;
2505     int tab_size = 8;
2506     const DIFFLN *p;
2507     int nwidth = display_numbers;
2508     int xwidth;
2509 
2510     xwidth = display_numbers;
2511     if (display_symbols)
2512         xwidth++;
2513     if (dview->tab_size > 0 && dview->tab_size < 9)
2514         tab_size = dview->tab_size;
2515 
2516     if (xwidth != 0)
2517     {
2518         if (xwidth > width && display_symbols)
2519         {
2520             xwidth--;
2521             display_symbols = FALSE;
2522         }
2523         if (xwidth > width && display_numbers != 0)
2524         {
2525             xwidth = width;
2526             display_numbers = width;
2527         }
2528 
2529         xwidth++;
2530         c += xwidth;
2531         width -= xwidth;
2532         if (width < 0)
2533             width = 0;
2534     }
2535 
2536     if ((int) sizeof (buf) <= width || (int) sizeof (buf) <= nwidth)
2537     {
2538         /* abnormal, but avoid buffer overflow */
2539         return -1;
2540     }
2541 
2542     for (i = dview->skip_rows, j = 0; i < dview->a[ord]->len && j < height; j++, i++)
2543     {
2544         int ch;
2545         int next_ch = 0;
2546         int col;
2547         size_t cnt;
2548 
2549         p = (DIFFLN *) & g_array_index (dview->a[ord], DIFFLN, i);
2550         ch = p->ch;
2551         tty_setcolor (NORMAL_COLOR);
2552         if (display_symbols)
2553         {
2554             tty_gotoyx (r + j, c - 2);
2555             tty_print_char (ch);
2556         }
2557         if (p->line != 0)
2558         {
2559             if (display_numbers != 0)
2560             {
2561                 tty_gotoyx (r + j, c - xwidth);
2562                 g_snprintf (buf, display_numbers + 1, "%*d", nwidth, p->line);
2563                 tty_print_string (str_fit_to_term (buf, nwidth, J_LEFT_FIT));
2564             }
2565             if (ch == ADD_CH)
2566                 tty_setcolor (DFF_ADD_COLOR);
2567             if (ch == CHG_CH)
2568                 tty_setcolor (DFF_CHG_COLOR);
2569             if (f == NULL)
2570             {
2571                 if (i == (size_t) dview->search.last_found_line)
2572                     tty_setcolor (MARKED_SELECTED_COLOR);
2573                 else if (dview->hdiff != NULL && g_ptr_array_index (dview->hdiff, i) != NULL)
2574                 {
2575                     char att[BUFSIZ];
2576 
2577 #ifdef HAVE_CHARSET
2578                     if (dview->utf8)
2579                         k = dview_str_utf8_offset_to_pos (p->p, width);
2580                     else
2581 #endif
2582                         k = width;
2583 
2584                     cvt_mgeta (p->p, p->u.len, buf, k, skip, tab_size, show_cr,
2585                                g_ptr_array_index (dview->hdiff, i), ord, att);
2586                     tty_gotoyx (r + j, c);
2587                     col = 0;
2588 
2589                     for (cnt = 0; cnt < strlen (buf) && col < width; cnt++)
2590                     {
2591                         gboolean ch_res;
2592 
2593 #ifdef HAVE_CHARSET
2594                         if (dview->utf8)
2595                         {
2596                             int ch_length = 0;
2597 
2598                             ch_res = dview_get_utf (buf + cnt, &next_ch, &ch_length);
2599                             if (ch_length > 1)
2600                                 cnt += ch_length - 1;
2601                             if (!g_unichar_isprint (next_ch))
2602                                 next_ch = '.';
2603                         }
2604                         else
2605 #endif
2606                             ch_res = dview_get_byte (buf + cnt, &next_ch);
2607 
2608                         if (ch_res)
2609                         {
2610                             tty_setcolor (att[cnt] ? DFF_CHH_COLOR : DFF_CHG_COLOR);
2611 #ifdef HAVE_CHARSET
2612                             if (mc_global.utf8_display)
2613                             {
2614                                 if (!dview->utf8)
2615                                 {
2616                                     next_ch =
2617                                         convert_from_8bit_to_utf_c ((unsigned char) next_ch,
2618                                                                     dview->converter);
2619                                 }
2620                             }
2621                             else if (dview->utf8)
2622                                 next_ch = convert_from_utf_to_current_c (next_ch, dview->converter);
2623                             else
2624                                 next_ch = convert_to_display_c (next_ch);
2625 #endif
2626                             tty_print_anychar (next_ch);
2627                             col++;
2628                         }
2629                     }
2630                     continue;
2631                 }
2632 
2633                 if (ch == CHG_CH)
2634                     tty_setcolor (DFF_CHH_COLOR);
2635 
2636 #ifdef HAVE_CHARSET
2637                 if (dview->utf8)
2638                     k = dview_str_utf8_offset_to_pos (p->p, width);
2639                 else
2640 #endif
2641                     k = width;
2642                 cvt_mget (p->p, p->u.len, buf, k, skip, tab_size, show_cr);
2643             }
2644             else
2645                 cvt_fget (f, p->u.off, buf, width, skip, tab_size, show_cr);
2646         }
2647         else
2648         {
2649             if (display_numbers != 0)
2650             {
2651                 tty_gotoyx (r + j, c - xwidth);
2652                 fill_by_space (buf, display_numbers, TRUE);
2653                 tty_print_string (buf);
2654             }
2655             if (ch == DEL_CH)
2656                 tty_setcolor (DFF_DEL_COLOR);
2657             if (ch == CHG_CH)
2658                 tty_setcolor (DFF_CHD_COLOR);
2659             fill_by_space (buf, width, TRUE);
2660         }
2661         tty_gotoyx (r + j, c);
2662         /* tty_print_nstring (buf, width); */
2663         col = 0;
2664         for (cnt = 0; cnt < strlen (buf) && col < width; cnt++)
2665         {
2666             gboolean ch_res;
2667 
2668 #ifdef HAVE_CHARSET
2669             if (dview->utf8)
2670             {
2671                 int ch_length = 0;
2672 
2673                 ch_res = dview_get_utf (buf + cnt, &next_ch, &ch_length);
2674                 if (ch_length > 1)
2675                     cnt += ch_length - 1;
2676                 if (!g_unichar_isprint (next_ch))
2677                     next_ch = '.';
2678             }
2679             else
2680 #endif
2681                 ch_res = dview_get_byte (buf + cnt, &next_ch);
2682 
2683             if (ch_res)
2684             {
2685 #ifdef HAVE_CHARSET
2686                 if (mc_global.utf8_display)
2687                 {
2688                     if (!dview->utf8)
2689                         next_ch =
2690                             convert_from_8bit_to_utf_c ((unsigned char) next_ch, dview->converter);
2691                 }
2692                 else if (dview->utf8)
2693                     next_ch = convert_from_utf_to_current_c (next_ch, dview->converter);
2694                 else
2695                     next_ch = convert_to_display_c (next_ch);
2696 #endif
2697 
2698                 tty_print_anychar (next_ch);
2699                 col++;
2700             }
2701         }
2702     }
2703     tty_setcolor (NORMAL_COLOR);
2704     k = width;
2705     if (width < xwidth - 1)
2706         k = xwidth - 1;
2707     fill_by_space (buf, k, TRUE);
2708     for (; j < height; j++)
2709     {
2710         if (xwidth != 0)
2711         {
2712             tty_gotoyx (r + j, c - xwidth);
2713             /* tty_print_nstring (buf, xwidth - 1); */
2714             tty_print_string (str_fit_to_term (buf, xwidth - 1, J_LEFT_FIT));
2715         }
2716         tty_gotoyx (r + j, c);
2717         /* tty_print_nstring (buf, width); */
2718         tty_print_string (str_fit_to_term (buf, width, J_LEFT_FIT));
2719     }
2720 
2721     return 0;
2722 }
2723 
2724 /* --------------------------------------------------------------------------------------------- */
2725 
2726 static void
2727 dview_status (const WDiff *dview, diff_place_t ord, int width, int c)
     /*   */
2728 {
2729     const char *buf;
2730     int filename_width;
2731     int linenum, lineofs;
2732     vfs_path_t *vpath;
2733     char *path;
2734 
2735     tty_setcolor (STATUSBAR_COLOR);
2736 
2737     tty_gotoyx (0, c);
2738     get_line_numbers (dview->a[ord], dview->skip_rows, &linenum, &lineofs);
2739 
2740     filename_width = width - 24;
2741     if (filename_width < 8)
2742         filename_width = 8;
2743 
2744     vpath = vfs_path_from_str (dview->label[ord]);
2745     path = vfs_path_to_str_flags (vpath, 0, VPF_STRIP_HOME | VPF_STRIP_PASSWORD);
2746     vfs_path_free (vpath, TRUE);
2747     buf = str_term_trim (path, filename_width);
2748     if (ord == DIFF_LEFT)
2749         tty_printf ("%s%-*s %6d+%-4d Col %-4d ", dview->merged[ord] ? "* " : "  ", filename_width,
2750                     buf, linenum, lineofs, dview->skip_cols);
2751     else
2752         tty_printf ("%s%-*s %6d+%-4d Dif %-4d ", dview->merged[ord] ? "* " : "  ", filename_width,
2753                     buf, linenum, lineofs, dview->ndiff);
2754     g_free (path);
2755 }
2756 
2757 /* --------------------------------------------------------------------------------------------- */
2758 
2759 static void
2760 dview_redo (WDiff *dview)
     /*   */
2761 {
2762     if (dview->display_numbers != 0)
2763     {
2764         int old;
2765 
2766         old = dview->display_numbers;
2767         dview->display_numbers = calc_nwidth ((const GArray * const *) dview->a);
2768         dview->new_frame = (old != dview->display_numbers);
2769     }
2770     dview_reread (dview);
2771 }
2772 
2773 /* --------------------------------------------------------------------------------------------- */
2774 
2775 static void
2776 dview_update (WDiff *dview)
     /*   */
2777 {
2778     int height = dview->height;
2779     int width1, width2;
2780     int last;
2781 
2782     last = dview->a[DIFF_LEFT]->len - 1;
2783 
2784     if (dview->skip_rows > last)
2785         dview->skip_rows = dview->search.last_accessed_num_line = last;
2786     if (dview->skip_rows < 0)
2787         dview->skip_rows = dview->search.last_accessed_num_line = 0;
2788     if (dview->skip_cols < 0)
2789         dview->skip_cols = 0;
2790 
2791     if (height < 2)
2792         return;
2793 
2794     /* use an actual length of dview->a */
2795     if (dview->display_numbers != 0)
2796         dview->display_numbers = calc_nwidth ((const GArray * const *) dview->a);
2797 
2798     width1 = dview->half1 + dview->bias;
2799     width2 = dview->half2 - dview->bias;
2800     if (dview->full)
2801     {
2802         width1 = COLS;
2803         width2 = 0;
2804     }
2805 
2806     if (dview->new_frame)
2807     {
2808         int xwidth;
2809 
2810         tty_setcolor (NORMAL_COLOR);
2811         xwidth = dview->display_numbers;
2812         if (dview->display_symbols)
2813             xwidth++;
2814         if (width1 > 1)
2815             tty_draw_box (1, 0, height, width1, FALSE);
2816         if (width2 > 1)
2817             tty_draw_box (1, width1, height, width2, FALSE);
2818 
2819         if (xwidth != 0)
2820         {
2821             xwidth++;
2822             if (xwidth < width1 - 1)
2823             {
2824                 tty_gotoyx (1, xwidth);
2825                 tty_print_alt_char (ACS_TTEE, FALSE);
2826                 tty_gotoyx (height, xwidth);
2827                 tty_print_alt_char (ACS_BTEE, FALSE);
2828                 tty_draw_vline (2, xwidth, ACS_VLINE, height - 2);
2829             }
2830             if (xwidth < width2 - 1)
2831             {
2832                 tty_gotoyx (1, width1 + xwidth);
2833                 tty_print_alt_char (ACS_TTEE, FALSE);
2834                 tty_gotoyx (height, width1 + xwidth);
2835                 tty_print_alt_char (ACS_BTEE, FALSE);
2836                 tty_draw_vline (2, width1 + xwidth, ACS_VLINE, height - 2);
2837             }
2838         }
2839         dview->new_frame = FALSE;
2840     }
2841 
2842     if (width1 > 2)
2843     {
2844         dview_status (dview, dview->ord, width1, 0);
2845         dview_display_file (dview, dview->ord, 2, 1, height - 2, width1 - 2);
2846     }
2847     if (width2 > 2)
2848     {
2849         diff_place_t ord;
2850 
2851         ord = dview->ord == DIFF_LEFT ? DIFF_RIGHT : DIFF_LEFT;
2852         dview_status (dview, ord, width2, width1);
2853         dview_display_file (dview, ord, 2, width1 + 1, height - 2, width2 - 2);
2854     }
2855 }
2856 
2857 /* --------------------------------------------------------------------------------------------- */
2858 
2859 static void
2860 dview_edit (WDiff *dview, diff_place_t ord)
     /*   */
2861 {
2862     Widget *h;
2863     gboolean h_modal;
2864     int linenum, lineofs;
2865 
2866     if (dview->dsrc == DATA_SRC_TMP)
2867     {
2868         error_dialog (_("Edit"), _("Edit is disabled"));
2869         return;
2870     }
2871 
2872     h = WIDGET (WIDGET (dview)->owner);
2873     h_modal = widget_get_state (h, WST_MODAL);
2874 
2875     get_line_numbers (dview->a[ord], dview->skip_rows, &linenum, &lineofs);
2876 
2877     /* disallow edit file in several editors */
2878     widget_set_state (h, WST_MODAL, TRUE);
2879 
2880     {
2881         vfs_path_t *tmp_vpath;
2882 
2883         tmp_vpath = vfs_path_from_str (dview->file[ord]);
2884         edit_file_at_line (tmp_vpath, use_internal_edit, linenum);
2885         vfs_path_free (tmp_vpath, TRUE);
2886     }
2887 
2888     widget_set_state (h, WST_MODAL, h_modal);
2889     dview_redo (dview);
2890     dview_update (dview);
2891 }
2892 
2893 /* --------------------------------------------------------------------------------------------- */
2894 
2895 static void
2896 dview_goto_cmd (WDiff *dview, diff_place_t ord)
     /*   */
2897 {
2898     static gboolean first_run = TRUE;
2899 
2900     /* *INDENT-OFF* */
2901     static const char *title[2] = {
2902         N_("Goto line (left)"),
2903         N_("Goto line (right)")
2904     };
2905     /* *INDENT-ON* */
2906 
2907     int newline;
2908     char *input;
2909 
2910     input =
2911         input_dialog (_(title[ord]), _("Enter line:"), MC_HISTORY_YDIFF_GOTO_LINE,
2912                       first_run ? NULL : INPUT_LAST_TEXT, INPUT_COMPLETE_NONE);
2913     if (input != NULL)
2914     {
2915         const char *s = input;
2916 
2917         if (scan_deci (&s, &newline) == 0 && *s == '\0')
2918         {
2919             size_t i = 0;
2920 
2921             if (newline > 0)
2922                 for (; i < dview->a[ord]->len; i++)
2923                 {
2924                     const DIFFLN *p;
2925 
2926                     p = &g_array_index (dview->a[ord], DIFFLN, i);
2927                     if (p->line == newline)
2928                         break;
2929                 }
2930 
2931             dview->skip_rows = dview->search.last_accessed_num_line = (ssize_t) i;
2932         }
2933 
2934         g_free (input);
2935     }
2936 
2937     first_run = FALSE;
2938 }
2939 
2940 /* --------------------------------------------------------------------------------------------- */
2941 
2942 static void
2943 dview_labels (WDiff *dview)
     /*   */
2944 {
2945     Widget *d = WIDGET (dview);
2946     WButtonBar *b;
2947 
2948     b = buttonbar_find (DIALOG (d->owner));
2949 
2950     buttonbar_set_label (b, 1, Q_ ("ButtonBar|Help"), d->keymap, d);
2951     buttonbar_set_label (b, 2, Q_ ("ButtonBar|Save"), d->keymap, d);
2952     buttonbar_set_label (b, 4, Q_ ("ButtonBar|Edit"), d->keymap, d);
2953     buttonbar_set_label (b, 5, Q_ ("ButtonBar|Merge"), d->keymap, d);
2954     buttonbar_set_label (b, 7, Q_ ("ButtonBar|Search"), d->keymap, d);
2955     buttonbar_set_label (b, 9, Q_ ("ButtonBar|Options"), d->keymap, d);
2956     buttonbar_set_label (b, 10, Q_ ("ButtonBar|Quit"), d->keymap, d);
2957 }
2958 
2959 /* --------------------------------------------------------------------------------------------- */
2960 
2961 static gboolean
2962 dview_save (WDiff *dview)
     /*   */
2963 {
2964     gboolean res = TRUE;
2965 
2966     if (dview->merged[DIFF_LEFT])
2967     {
2968         res = mc_util_unlink_backup_if_possible (dview->file[DIFF_LEFT], "~~~");
2969         dview->merged[DIFF_LEFT] = !res;
2970     }
2971     if (dview->merged[DIFF_RIGHT])
2972     {
2973         res = mc_util_unlink_backup_if_possible (dview->file[DIFF_RIGHT], "~~~");
2974         dview->merged[DIFF_RIGHT] = !res;
2975     }
2976     return res;
2977 }
2978 
2979 /* --------------------------------------------------------------------------------------------- */
2980 
2981 static void
2982 dview_do_save (WDiff *dview)
     /*   */
2983 {
2984     (void) dview_save (dview);
2985 }
2986 
2987 /* --------------------------------------------------------------------------------------------- */
2988 
2989 /*
2990  * Check if it's OK to close the diff viewer.  If there are unsaved changes,
2991  * ask user.
2992  */
2993 static gboolean
2994 dview_ok_to_exit (WDiff *dview)
     /*   */
2995 {
2996     gboolean res = TRUE;
2997     int act;
2998 
2999     if (!dview->merged[DIFF_LEFT] && !dview->merged[DIFF_RIGHT])
3000         return res;
3001 
3002     act = query_dialog (_("Quit"), !mc_global.midnight_shutdown ?
3003                         _("File(s) was modified. Save with exit?") :
3004                         _("Midnight Commander is being shut down.\nSave modified file(s)?"),
3005                         D_NORMAL, 2, _("&Yes"), _("&No"));
3006 
3007     /* Esc is No */
3008     if (mc_global.midnight_shutdown || (act == -1))
3009         act = 1;
3010 
3011     switch (act)
3012     {
3013     case -1:                   /* Esc */
3014         res = FALSE;
3015         break;
3016     case 0:                    /* Yes */
3017         (void) dview_save (dview);
3018         res = TRUE;
3019         break;
3020     case 1:                    /* No */
3021         if (mc_util_restore_from_backup_if_possible (dview->file[DIFF_LEFT], "~~~"))
3022             res = mc_util_unlink_backup_if_possible (dview->file[DIFF_LEFT], "~~~");
3023         if (mc_util_restore_from_backup_if_possible (dview->file[DIFF_RIGHT], "~~~"))
3024             res = mc_util_unlink_backup_if_possible (dview->file[DIFF_RIGHT], "~~~");
3025         MC_FALLTHROUGH;
3026     default:
3027         res = TRUE;
3028         break;
3029     }
3030     return res;
3031 }
3032 
3033 /* --------------------------------------------------------------------------------------------- */
3034 
3035 static cb_ret_t
3036 dview_execute_cmd (WDiff *dview, long command)
     /*   */
3037 {
3038     cb_ret_t res = MSG_HANDLED;
3039 
3040     switch (command)
3041     {
3042     case CK_ShowSymbols:
3043         dview->display_symbols = !dview->display_symbols;
3044         dview->new_frame = TRUE;
3045         break;
3046     case CK_ShowNumbers:
3047         dview->display_numbers ^= calc_nwidth ((const GArray * const *) dview->a);
3048         dview->new_frame = TRUE;
3049         break;
3050     case CK_SplitFull:
3051         dview->full = !dview->full;
3052         dview->new_frame = TRUE;
3053         break;
3054     case CK_SplitEqual:
3055         if (!dview->full)
3056         {
3057             dview->bias = 0;
3058             dview->new_frame = TRUE;
3059         }
3060         break;
3061     case CK_SplitMore:
3062         if (!dview->full)
3063         {
3064             dview_compute_split (dview, 1);
3065             dview->new_frame = TRUE;
3066         }
3067         break;
3068 
3069     case CK_SplitLess:
3070         if (!dview->full)
3071         {
3072             dview_compute_split (dview, -1);
3073             dview->new_frame = TRUE;
3074         }
3075         break;
3076     case CK_Tab2:
3077         dview->tab_size = 2;
3078         break;
3079     case CK_Tab3:
3080         dview->tab_size = 3;
3081         break;
3082     case CK_Tab4:
3083         dview->tab_size = 4;
3084         break;
3085     case CK_Tab8:
3086         dview->tab_size = 8;
3087         break;
3088     case CK_Swap:
3089         dview->ord ^= 1;
3090         break;
3091     case CK_Redo:
3092         dview_redo (dview);
3093         break;
3094     case CK_HunkNext:
3095         dview->skip_rows = dview->search.last_accessed_num_line =
3096             find_next_hunk (dview->a[DIFF_LEFT], dview->skip_rows);
3097         break;
3098     case CK_HunkPrev:
3099         dview->skip_rows = dview->search.last_accessed_num_line =
3100             find_prev_hunk (dview->a[DIFF_LEFT], dview->skip_rows);
3101         break;
3102     case CK_Goto:
3103         dview_goto_cmd (dview, DIFF_RIGHT);
3104         break;
3105     case CK_Edit:
3106         dview_edit (dview, dview->ord);
3107         break;
3108     case CK_Merge:
3109         do_merge_hunk (dview, FROM_LEFT_TO_RIGHT);
3110         dview_redo (dview);
3111         break;
3112     case CK_MergeOther:
3113         do_merge_hunk (dview, FROM_RIGHT_TO_LEFT);
3114         dview_redo (dview);
3115         break;
3116     case CK_EditOther:
3117         dview_edit (dview, dview->ord ^ 1);
3118         break;
3119     case CK_Search:
3120         dview_search_cmd (dview);
3121         break;
3122     case CK_SearchContinue:
3123         dview_continue_search_cmd (dview);
3124         break;
3125     case CK_Top:
3126         dview->skip_rows = dview->search.last_accessed_num_line = 0;
3127         break;
3128     case CK_Bottom:
3129         dview->skip_rows = dview->search.last_accessed_num_line = dview->a[DIFF_LEFT]->len - 1;
3130         break;
3131     case CK_Up:
3132         if (dview->skip_rows > 0)
3133         {
3134             dview->skip_rows--;
3135             dview->search.last_accessed_num_line = dview->skip_rows;
3136         }
3137         break;
3138     case CK_Down:
3139         dview->skip_rows++;
3140         dview->search.last_accessed_num_line = dview->skip_rows;
3141         break;
3142     case CK_PageDown:
3143         if (dview->height > 2)
3144         {
3145             dview->skip_rows += dview->height - 2;
3146             dview->search.last_accessed_num_line = dview->skip_rows;
3147         }
3148         break;
3149     case CK_PageUp:
3150         if (dview->height > 2)
3151         {
3152             dview->skip_rows -= dview->height - 2;
3153             dview->search.last_accessed_num_line = dview->skip_rows;
3154         }
3155         break;
3156     case CK_Left:
3157         dview->skip_cols--;
3158         break;
3159     case CK_Right:
3160         dview->skip_cols++;
3161         break;
3162     case CK_LeftQuick:
3163         dview->skip_cols -= 8;
3164         break;
3165     case CK_RightQuick:
3166         dview->skip_cols += 8;
3167         break;
3168     case CK_Home:
3169         dview->skip_cols = 0;
3170         break;
3171     case CK_Shell:
3172         toggle_subshell ();
3173         break;
3174     case CK_Quit:
3175         dview->view_quit = TRUE;
3176         break;
3177     case CK_Save:
3178         dview_do_save (dview);
3179         break;
3180     case CK_Options:
3181         dview_diff_options (dview);
3182         break;
3183 #ifdef HAVE_CHARSET
3184     case CK_SelectCodepage:
3185         dview_select_encoding (dview);
3186         break;
3187 #endif
3188     case CK_Cancel:
3189         /* don't close diffviewer due to SIGINT */
3190         break;
3191     default:
3192         res = MSG_NOT_HANDLED;
3193     }
3194     return res;
3195 }
3196 
3197 /* --------------------------------------------------------------------------------------------- */
3198 
3199 static cb_ret_t
3200 dview_handle_key (WDiff *dview, int key)
     /*   */
3201 {
3202     long command;
3203 
3204 #ifdef HAVE_CHARSET
3205     key = convert_from_input_c (key);
3206 #endif
3207 
3208     command = widget_lookup_key (WIDGET (dview), key);
3209     if (command == CK_IgnoreKey)
3210         return MSG_NOT_HANDLED;
3211 
3212     return dview_execute_cmd (dview, command);
3213 }
3214 
3215 /* --------------------------------------------------------------------------------------------- */
3216 
3217 static cb_ret_t
3218 dview_callback (Widget *w, Widget *sender, widget_msg_t msg, int parm, void *data)
     /*   */
3219 {
3220     WDiff *dview = (WDiff *) w;
3221     WDialog *h = DIALOG (w->owner);
3222     cb_ret_t i;
3223 
3224     switch (msg)
3225     {
3226     case MSG_INIT:
3227         dview_labels (dview);
3228         dview_update (dview);
3229         return MSG_HANDLED;
3230 
3231     case MSG_DRAW:
3232         dview->new_frame = TRUE;
3233         dview_update (dview);
3234         return MSG_HANDLED;
3235 
3236     case MSG_KEY:
3237         i = dview_handle_key (dview, parm);
3238         if (dview->view_quit)
3239             dlg_close (h);
3240         else
3241             dview_update (dview);
3242         return i;
3243 
3244     case MSG_ACTION:
3245         i = dview_execute_cmd (dview, parm);
3246         if (dview->view_quit)
3247             dlg_close (h);
3248         else
3249             dview_update (dview);
3250         return i;
3251 
3252     case MSG_RESIZE:
3253         widget_default_callback (w, NULL, MSG_RESIZE, 0, data);
3254         dview_compute_areas (dview);
3255         return MSG_HANDLED;
3256 
3257     case MSG_DESTROY:
3258         dview_save_options (dview);
3259         dview_fini (dview);
3260         return MSG_HANDLED;
3261 
3262     default:
3263         return widget_default_callback (w, sender, msg, parm, data);
3264     }
3265 }
3266 
3267 /* --------------------------------------------------------------------------------------------- */
3268 
3269 static void
3270 dview_mouse_callback (Widget *w, mouse_msg_t msg, mouse_event_t *event)
     /*   */
3271 {
3272     WDiff *dview = (WDiff *) w;
3273 
3274     (void) event;
3275 
3276     switch (msg)
3277     {
3278     case MSG_MOUSE_SCROLL_UP:
3279     case MSG_MOUSE_SCROLL_DOWN:
3280         if (msg == MSG_MOUSE_SCROLL_UP)
3281             dview->skip_rows -= 2;
3282         else
3283             dview->skip_rows += 2;
3284 
3285         dview->search.last_accessed_num_line = dview->skip_rows;
3286         dview_update (dview);
3287         break;
3288 
3289     default:
3290         break;
3291     }
3292 }
3293 
3294 /* --------------------------------------------------------------------------------------------- */
3295 
3296 static cb_ret_t
3297 dview_dialog_callback (Widget *w, Widget *sender, widget_msg_t msg, int parm, void *data)
     /*   */
3298 {
3299     WDiff *dview;
3300     WDialog *h = DIALOG (w);
3301 
3302     switch (msg)
3303     {
3304     case MSG_ACTION:
3305         /* Handle shortcuts. */
3306 
3307         /* Note: the buttonbar sends messages directly to the the WDiff, not to
3308          * here, which is why we can pass NULL in the following call. */
3309         return dview_execute_cmd (NULL, parm);
3310 
3311     case MSG_VALIDATE:
3312         dview = (WDiff *) widget_find_by_type (CONST_WIDGET (h), dview_callback);
3313         /* don't stop the dialog before final decision */
3314         widget_set_state (w, WST_ACTIVE, TRUE);
3315         if (dview_ok_to_exit (dview))
3316             dlg_close (h);
3317         return MSG_HANDLED;
3318 
3319     default:
3320         return dlg_default_callback (w, sender, msg, parm, data);
3321     }
3322 }
3323 
3324 /* --------------------------------------------------------------------------------------------- */
3325 
3326 static char *
3327 dview_get_title (const WDialog *h, size_t len)
     /*   */
3328 {
3329     const WDiff *dview;
3330     const char *modified = " (*) ";
3331     const char *notmodified = "     ";
3332     size_t len1;
3333     GString *title;
3334 
3335     dview = (const WDiff *) widget_find_by_type (CONST_WIDGET (h), dview_callback);
3336     len1 = (len - str_term_width1 (_("Diff:")) - strlen (modified) - 3) / 2;
3337 
3338     title = g_string_sized_new (len);
3339     g_string_append (title, _("Diff:"));
3340     g_string_append (title, dview->merged[DIFF_LEFT] ? modified : notmodified);
3341     g_string_append (title, str_term_trim (dview->label[DIFF_LEFT], len1));
3342     g_string_append (title, " | ");
3343     g_string_append (title, dview->merged[DIFF_RIGHT] ? modified : notmodified);
3344     g_string_append (title, str_term_trim (dview->label[DIFF_RIGHT], len1));
3345 
3346     return g_string_free (title, FALSE);
3347 }
3348 
3349 /* --------------------------------------------------------------------------------------------- */
3350 
3351 static int
3352 diff_view (const char *file1, const char *file2, const char *label1, const char *label2)
     /*   */
3353 {
3354     int error;
3355     WDiff *dview;
3356     Widget *w;
3357     WDialog *dview_dlg;
3358     Widget *dw;
3359     WRect r;
3360     WGroup *g;
3361 
3362     /* Create dialog and widgets, put them on the dialog */
3363     dview_dlg =
3364         dlg_create (FALSE, 0, 0, 1, 1, WPOS_FULLSCREEN, FALSE, NULL, dview_dialog_callback, NULL,
3365                     "[Diff Viewer]", NULL);
3366     dw = WIDGET (dview_dlg);
3367     widget_want_tab (dw, TRUE);
3368     r = dw->rect;
3369 
3370     g = GROUP (dview_dlg);
3371 
3372     dview = g_new0 (WDiff, 1);
3373     w = WIDGET (dview);
3374     r.lines--;
3375     widget_init (w, &r, dview_callback, dview_mouse_callback);
3376     w->options |= WOP_SELECTABLE;
3377     w->keymap = diff_map;
3378     group_add_widget_autopos (g, w, WPOS_KEEP_ALL, NULL);
3379 
3380     w = WIDGET (buttonbar_new ());
3381     group_add_widget_autopos (g, w, w->pos_flags, NULL);
3382 
3383     dview_dlg->get_title = dview_get_title;
3384 
3385     error = dview_init (dview, "-a", file1, file2, label1, label2, DATA_SRC_MEM);       /* XXX binary diff? */
3386     if (error >= 0)
3387         error = redo_diff (dview);
3388     if (error >= 0)
3389     {
3390         dview->ndiff = error;
3391         dview_compute_areas (dview);
3392         error = 0;
3393     }
3394 
3395     if (error == 0)
3396         dlg_run (dview_dlg);
3397 
3398     if (error != 0 || widget_get_state (dw, WST_CLOSED))
3399         widget_destroy (dw);
3400 
3401     return error == 0 ? 1 : 0;
3402 }
3403 
3404 /*** public functions ****************************************************************************/
3405 /* --------------------------------------------------------------------------------------------- */
3406 
3407 #define GET_FILE_AND_STAMP(n) \
3408 do \
3409 { \
3410     use_copy##n = 0; \
3411     real_file##n = file##n; \
3412     if (!vfs_file_is_local (file##n)) \
3413     { \
3414         real_file##n = mc_getlocalcopy (file##n); \
3415         if (real_file##n != NULL) \
3416         { \
3417             use_copy##n = 1; \
3418             if (mc_stat (real_file##n, &st##n) != 0) \
3419                 use_copy##n = -1; \
3420         } \
3421     } \
3422 } \
3423 while (0)
3424 
3425 #define UNGET_FILE(n) \
3426 do \
3427 { \
3428     if (use_copy##n != 0) \
3429     { \
3430         gboolean changed = FALSE; \
3431         if (use_copy##n > 0) \
3432         { \
3433             time_t mtime; \
3434             mtime = st##n.st_mtime; \
3435             if (mc_stat (real_file##n, &st##n) == 0) \
3436                 changed = (mtime != st##n.st_mtime); \
3437         } \
3438         mc_ungetlocalcopy (file##n, real_file##n, changed); \
3439         vfs_path_free (real_file##n, TRUE); \
3440     } \
3441 } \
3442 while (0)
3443 
3444 gboolean
3445 dview_diff_cmd (const void *f0, const void *f1)
     /*   */
3446 {
3447     int rv = 0;
3448     vfs_path_t *file0 = NULL;
3449     vfs_path_t *file1 = NULL;
3450     gboolean is_dir0 = FALSE;
3451     gboolean is_dir1 = FALSE;
3452 
3453     switch (mc_global.mc_run_mode)
3454     {
3455     case MC_RUN_FULL:
3456         {
3457             /* run from panels */
3458             const WPanel *panel0 = (const WPanel *) f0;
3459             const WPanel *panel1 = (const WPanel *) f1;
3460             const file_entry_t *fe0, *fe1;
3461 
3462             fe0 = panel_current_entry (panel0);
3463             if (fe0 == NULL)
3464             {
3465                 message (D_ERROR, MSG_ERROR, "%s", _("File name is empty!"));
3466                 goto ret;
3467             }
3468 
3469             file0 = vfs_path_append_new (panel0->cwd_vpath, fe0->fname->str, (char *) NULL);
3470             is_dir0 = S_ISDIR (fe0->st.st_mode);
3471             if (is_dir0)
3472             {
3473                 message (D_ERROR, MSG_ERROR, _("\"%s\" is a directory"),
3474                          path_trunc (fe0->fname->str, 30));
3475                 goto ret;
3476             }
3477 
3478             fe1 = panel_current_entry (panel1);
3479             if (fe1 == NULL)
3480             {
3481                 message (D_ERROR, MSG_ERROR, "%s", _("File name is empty!"));
3482                 goto ret;
3483             }
3484             file1 = vfs_path_append_new (panel1->cwd_vpath, fe1->fname->str, (char *) NULL);
3485             is_dir1 = S_ISDIR (fe1->st.st_mode);
3486             if (is_dir1)
3487             {
3488                 message (D_ERROR, MSG_ERROR, _("\"%s\" is a directory"),
3489                          path_trunc (fe1->fname->str, 30));
3490                 goto ret;
3491             }
3492             break;
3493         }
3494 
3495     case MC_RUN_DIFFVIEWER:
3496         {
3497             /* run from command line */
3498             const char *p0 = (const char *) f0;
3499             const char *p1 = (const char *) f1;
3500             struct stat st;
3501 
3502             file0 = vfs_path_from_str (p0);
3503             if (mc_stat (file0, &st) == 0)
3504             {
3505                 is_dir0 = S_ISDIR (st.st_mode);
3506                 if (is_dir0)
3507                 {
3508                     message (D_ERROR, MSG_ERROR, _("\"%s\" is a directory"), path_trunc (p0, 30));
3509                     goto ret;
3510                 }
3511             }
3512             else
3513             {
3514                 message (D_ERROR, MSG_ERROR, _("Cannot stat \"%s\"\n%s"),
3515                          path_trunc (p0, 30), unix_error_string (errno));
3516                 goto ret;
3517             }
3518 
3519             file1 = vfs_path_from_str (p1);
3520             if (mc_stat (file1, &st) == 0)
3521             {
3522                 is_dir1 = S_ISDIR (st.st_mode);
3523                 if (is_dir1)
3524                 {
3525                     message (D_ERROR, MSG_ERROR, _("\"%s\" is a directory"), path_trunc (p1, 30));
3526                     goto ret;
3527                 }
3528             }
3529             else
3530             {
3531                 message (D_ERROR, MSG_ERROR, _("Cannot stat \"%s\"\n%s"),
3532                          path_trunc (p1, 30), unix_error_string (errno));
3533                 goto ret;
3534             }
3535             break;
3536         }
3537 
3538     default:
3539         /* this should not happened */
3540         message (D_ERROR, MSG_ERROR, _("Diff viewer: invalid mode"));
3541         return FALSE;
3542     }
3543 
3544     if (rv == 0)
3545     {
3546         rv = -1;
3547         if (file0 != NULL && file1 != NULL)
3548         {
3549             int use_copy0, use_copy1;
3550             struct stat st0, st1;
3551             vfs_path_t *real_file0, *real_file1;
3552 
3553             GET_FILE_AND_STAMP (0);
3554             GET_FILE_AND_STAMP (1);
3555 
3556             if (real_file0 != NULL && real_file1 != NULL)
3557                 rv = diff_view (vfs_path_as_str (real_file0), vfs_path_as_str (real_file1),
3558                                 vfs_path_as_str (file0), vfs_path_as_str (file1));
3559 
3560             UNGET_FILE (1);
3561             UNGET_FILE (0);
3562         }
3563     }
3564 
3565     if (rv == 0)
3566         message (D_ERROR, MSG_ERROR, _("Two files are needed to compare"));
3567 
3568   ret:
3569     vfs_path_free (file1, TRUE);
3570     vfs_path_free (file0, TRUE);
3571 
3572     return (rv != 0);
3573 }
3574 
3575 #undef GET_FILE_AND_STAMP
3576 #undef UNGET_FILE
3577 
3578 /* --------------------------------------------------------------------------------------------- */
/* */
root/src/diffviewer/ydiff.c

DEFINITIONS
