lib/search/regex.c

lib/search/regex.c
/* */
This source file includes following definitions.
mc_search__regex_str_append_if_special
mc_search__cond_struct_new_regex_hex_add
mc_search__cond_struct_new_regex_accum_append
mc_search__cond_struct_new_regex_ci_str
mc_search__g_regex_match_full_safe
mc_search__regex_found_cond_one
mc_search__regex_found_cond
mc_search_regex__get_max_num_of_replace_tokens
mc_search_regex__get_token_by_num
mc_search_regex__replace_handle_esc_seq
mc_search_regex__process_replace_str
mc_search_regex__process_append_str
mc_search_regex__process_escape_sequence
mc_search__cond_struct_new_init_regex
mc_search__run_regex
mc_search_regex_prepare_replace_str
   1 /*
   2    Search text engine.
   3    Regex search
   4 
   5    Copyright (C) 2009-2022
   6    Free Software Foundation, Inc.
   7 
   8    Written by:
   9    Slava Zanko <slavazanko@gmail.com>, 2009, 2010, 2011, 2013
  10    Vitaliy Filippov <vitalif@yourcmc.ru>, 2011
  11    Andrew Borodin <aborodin@vmail.ru>, 2013-2015
  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 #include <config.h>
  30 
  31 #include <stdlib.h>
  32 
  33 #include "lib/global.h"
  34 #include "lib/strutil.h"
  35 #include "lib/search.h"
  36 #include "lib/strescape.h"
  37 #include "lib/util.h"           /* MC_PTR_FREE */
  38 
  39 #include "internal.h"
  40 
  41 /*** global variables ****************************************************************************/
  42 
  43 /*** file scope macro definitions ****************************************************************/
  44 
  45 #define REPLACE_PREPARE_T_NOTHING_SPECIAL -1
  46 #define REPLACE_PREPARE_T_REPLACE_FLAG    -2
  47 #define REPLACE_PREPARE_T_ESCAPE_SEQ      -3
  48 
  49 /*** file scope type declarations ****************************************************************/
  50 
  51 typedef enum
  52 {
  53     REPLACE_T_NO_TRANSFORM = 0,
  54     REPLACE_T_UPP_TRANSFORM_CHAR = 1,
  55     REPLACE_T_LOW_TRANSFORM_CHAR = 2,
  56     REPLACE_T_UPP_TRANSFORM = 4,
  57     REPLACE_T_LOW_TRANSFORM = 8
  58 } replace_transform_type_t;
  59 
  60 
  61 /*** file scope variables ************************************************************************/
  62 
  63 /*** file scope functions ************************************************************************/
  64 
  65 static gboolean
  66 mc_search__regex_str_append_if_special (GString * copy_to, const GString * regex_str,
     /*   */
  67                                         gsize * offset)
  68 {
  69     const char *special_chars[] = {
  70         "\\s", "\\S",
  71         "\\d", "\\D",
  72         "\\b", "\\B",
  73         "\\w", "\\W",
  74         "\\t", "\\n",
  75         "\\r", "\\f",
  76         "\\a", "\\e",
  77         "\\x", "\\X",
  78         "\\c", "\\C",
  79         "\\l", "\\L",
  80         "\\u", "\\U",
  81         "\\E", "\\Q",
  82         NULL
  83     };
  84 
  85     char *tmp_regex_str;
  86     const char **spec_chr;
  87 
  88     tmp_regex_str = &(regex_str->str[*offset]);
  89 
  90     for (spec_chr = special_chars; *spec_chr != NULL; spec_chr++)
  91     {
  92         gsize spec_chr_len;
  93 
  94         spec_chr_len = strlen (*spec_chr);
  95 
  96         if (strncmp (tmp_regex_str, *spec_chr, spec_chr_len) == 0
  97             && !strutils_is_char_escaped (regex_str->str, tmp_regex_str))
  98         {
  99             if (strncmp ("\\x", *spec_chr, spec_chr_len) == 0)
 100             {
 101                 if (tmp_regex_str[spec_chr_len] != '{')
 102                     spec_chr_len += 2;
 103                 else
 104                 {
 105                     while ((spec_chr_len < regex_str->len - *offset)
 106                            && tmp_regex_str[spec_chr_len] != '}')
 107                         spec_chr_len++;
 108                     if (tmp_regex_str[spec_chr_len] == '}')
 109                         spec_chr_len++;
 110                 }
 111             }
 112             g_string_append_len (copy_to, tmp_regex_str, spec_chr_len);
 113             *offset += spec_chr_len;
 114             return TRUE;
 115         }
 116     }
 117 
 118     return FALSE;
 119 }
 120 
 121 /* --------------------------------------------------------------------------------------------- */
 122 
 123 static void
 124 mc_search__cond_struct_new_regex_hex_add (const char *charset, GString * str_to,
     /*   */
 125                                           const char *one_char, gsize str_len)
 126 {
 127     GString *upp, *low;
 128     gsize loop;
 129 
 130     upp = mc_search__toupper_case_str (charset, one_char, str_len);
 131     low = mc_search__tolower_case_str (charset, one_char, str_len);
 132 
 133     for (loop = 0; loop < upp->len; loop++)
 134     {
 135         gchar tmp_str[10 + 1];  /* longest content is "[\\x%02X\\x%02X]" */
 136         gint tmp_len;
 137 
 138         if (loop >= low->len || upp->str[loop] == low->str[loop])
 139             tmp_len =
 140                 g_snprintf (tmp_str, sizeof (tmp_str), "\\x%02X", (unsigned char) upp->str[loop]);
 141         else
 142             tmp_len =
 143                 g_snprintf (tmp_str, sizeof (tmp_str), "[\\x%02X\\x%02X]",
 144                             (unsigned char) upp->str[loop], (unsigned char) low->str[loop]);
 145 
 146         g_string_append_len (str_to, tmp_str, tmp_len);
 147     }
 148 
 149     g_string_free (upp, TRUE);
 150     g_string_free (low, TRUE);
 151 }
 152 
 153 /* --------------------------------------------------------------------------------------------- */
 154 
 155 static void
 156 mc_search__cond_struct_new_regex_accum_append (const char *charset, GString * str_to,
     /*   */
 157                                                GString * str_from)
 158 {
 159     GString *recoded_part;
 160     gsize loop = 0;
 161 
 162     recoded_part = g_string_sized_new (32);
 163 
 164     while (loop < str_from->len)
 165     {
 166         gchar *one_char;
 167         gsize one_char_len;
 168         gboolean just_letters;
 169 
 170         one_char =
 171             mc_search__get_one_symbol (charset, &(str_from->str[loop]),
 172                                        MIN (str_from->len - loop, 6), &just_letters);
 173         one_char_len = strlen (one_char);
 174 
 175         if (one_char_len == 0)
 176             loop++;
 177         else
 178         {
 179             loop += one_char_len;
 180 
 181             if (just_letters)
 182                 mc_search__cond_struct_new_regex_hex_add (charset, recoded_part, one_char,
 183                                                           one_char_len);
 184             else
 185                 g_string_append_len (recoded_part, one_char, one_char_len);
 186         }
 187 
 188         g_free (one_char);
 189     }
 190 
 191     g_string_append_len (str_to, recoded_part->str, recoded_part->len);
 192     g_string_free (recoded_part, TRUE);
 193     g_string_set_size (str_from, 0);
 194 }
 195 
 196 /* --------------------------------------------------------------------------------------------- */
 197 
 198 /**
 199  * Creates a case-insensitive version of a regex pattern.
 200  *
 201  * For example (assuming ASCII charset): given "\\bHello!\\xAB", returns
 202  * "\\b[Hh][Ee][Ll][Ll][Oo]!\\xAB" (this example is for easier reading; in
 203  * reality hex codes are used instead of letters).
 204  *
 205  * This function knows not to ruin special regex symbols.
 206  *
 207  * This function is used when working with non-UTF-8 charsets: GLib's
 208  * regex engine doesn't understand such charsets and therefore can't do
 209  * this job itself.
 210  */
 211 static GString *
 212 mc_search__cond_struct_new_regex_ci_str (const char *charset, const GString * astr)
     /*   */
 213 {
 214     GString *accumulator, *spec_char, *ret_str;
 215     gsize loop;
 216 
 217     ret_str = g_string_sized_new (64);
 218     accumulator = g_string_sized_new (64);
 219     spec_char = g_string_sized_new (64);
 220     loop = 0;
 221 
 222     while (loop <= astr->len)
 223     {
 224         if (mc_search__regex_str_append_if_special (spec_char, astr, &loop))
 225         {
 226             mc_search__cond_struct_new_regex_accum_append (charset, ret_str, accumulator);
 227             g_string_append_len (ret_str, spec_char->str, spec_char->len);
 228             g_string_set_size (spec_char, 0);
 229             continue;
 230         }
 231 
 232         if (astr->str[loop] == '[' && !strutils_is_char_escaped (astr->str, &(astr->str[loop])))
 233         {
 234             mc_search__cond_struct_new_regex_accum_append (charset, ret_str, accumulator);
 235 
 236             while (loop < astr->len && !(astr->str[loop] == ']'
 237                                          && !strutils_is_char_escaped (astr->str,
 238                                                                        &(astr->str[loop]))))
 239             {
 240                 g_string_append_c (ret_str, astr->str[loop]);
 241                 loop++;
 242             }
 243 
 244             g_string_append_c (ret_str, astr->str[loop]);
 245             loop++;
 246             continue;
 247         }
 248         /*
 249            TODO: handle [ and ]
 250          */
 251         g_string_append_c (accumulator, astr->str[loop]);
 252         loop++;
 253     }
 254     mc_search__cond_struct_new_regex_accum_append (charset, ret_str, accumulator);
 255 
 256     g_string_free (accumulator, TRUE);
 257     g_string_free (spec_char, TRUE);
 258 
 259     return ret_str;
 260 }
 261 
 262 /* --------------------------------------------------------------------------------------------- */
 263 
 264 #ifdef SEARCH_TYPE_GLIB
 265 /* A thin wrapper above g_regex_match_full that makes sure the string passed
 266  * to it is valid UTF-8 (unless G_REGEX_RAW compile flag was set), as it is a
 267  * requirement by glib and it might crash otherwise. See: mc ticket 3449.
 268  * Be careful: there might be embedded NULs in the strings. */
 269 static gboolean
 270 mc_search__g_regex_match_full_safe (const GRegex * regex,
     /*   */
 271                                     const gchar * string,
 272                                     gssize string_len,
 273                                     gint start_position,
 274                                     GRegexMatchFlags match_options,
 275                                     GMatchInfo ** match_info, GError ** error)
 276 {
 277     char *string_safe, *p, *end;
 278     gboolean ret;
 279 
 280     if (string_len < 0)
 281         string_len = strlen (string);
 282 
 283     if ((g_regex_get_compile_flags (regex) & G_REGEX_RAW)
 284         || g_utf8_validate (string, string_len, NULL))
 285     {
 286         return g_regex_match_full (regex, string, string_len, start_position, match_options,
 287                                    match_info, error);
 288     }
 289 
 290     /* Correctly handle embedded NULs while copying */
 291     p = string_safe = g_malloc (string_len + 1);
 292     memcpy (string_safe, string, string_len);
 293     string_safe[string_len] = '\0';
 294     end = p + string_len;
 295 
 296     while (p < end)
 297     {
 298         gunichar c = g_utf8_get_char_validated (p, -1);
 299         if (c != (gunichar) (-1) && c != (gunichar) (-2))
 300         {
 301             p = g_utf8_next_char (p);
 302         }
 303         else
 304         {
 305             /* U+FFFD would be the proper choice, but then we'd have to
 306                maintain mapping between old and new offsets.
 307                So rather do a byte by byte replacement. */
 308             *p++ = '\0';
 309         }
 310     }
 311 
 312     ret =
 313         g_regex_match_full (regex, string_safe, string_len, start_position, match_options,
 314                             match_info, error);
 315     g_free (string_safe);
 316     return ret;
 317 }
 318 #endif /* SEARCH_TYPE_GLIB */
 319 
 320 /* --------------------------------------------------------------------------------------------- */
 321 
 322 static mc_search__found_cond_t
 323 mc_search__regex_found_cond_one (mc_search_t * lc_mc_search, mc_search_regex_t * regex,
     /*   */
 324                                  GString * search_str)
 325 {
 326 #ifdef SEARCH_TYPE_GLIB
 327     GError *mcerror = NULL;
 328 
 329     if (!mc_search__g_regex_match_full_safe
 330         (regex, search_str->str, search_str->len, 0, G_REGEX_MATCH_NEWLINE_ANY,
 331          &lc_mc_search->regex_match_info, &mcerror))
 332     {
 333         g_match_info_free (lc_mc_search->regex_match_info);
 334         lc_mc_search->regex_match_info = NULL;
 335         if (mcerror != NULL)
 336         {
 337             lc_mc_search->error = MC_SEARCH_E_REGEX;
 338             g_free (lc_mc_search->error_str);
 339             lc_mc_search->error_str =
 340                 str_conv_gerror_message (mcerror, _("Regular expression error"));
 341             g_error_free (mcerror);
 342             return COND__FOUND_ERROR;
 343         }
 344         return COND__NOT_FOUND;
 345     }
 346     lc_mc_search->num_results = g_match_info_get_match_count (lc_mc_search->regex_match_info);
 347 #else /* SEARCH_TYPE_GLIB */
 348     lc_mc_search->num_results = pcre_exec (regex, lc_mc_search->regex_match_info,
 349                                            search_str->str, search_str->len, 0, 0,
 350                                            lc_mc_search->iovector, MC_SEARCH__NUM_REPLACE_ARGS);
 351     if (lc_mc_search->num_results < 0)
 352     {
 353         return COND__NOT_FOUND;
 354     }
 355 #endif /* SEARCH_TYPE_GLIB */
 356     return COND__FOUND_OK;
 357 
 358 }
 359 
 360 /* --------------------------------------------------------------------------------------------- */
 361 
 362 static mc_search__found_cond_t
 363 mc_search__regex_found_cond (mc_search_t * lc_mc_search, GString * search_str)
     /*   */
 364 {
 365     gsize loop1;
 366 
 367     for (loop1 = 0; loop1 < lc_mc_search->prepared.conditions->len; loop1++)
 368     {
 369         mc_search_cond_t *mc_search_cond;
 370         mc_search__found_cond_t ret;
 371 
 372         mc_search_cond =
 373             (mc_search_cond_t *) g_ptr_array_index (lc_mc_search->prepared.conditions, loop1);
 374 
 375         if (!mc_search_cond->regex_handle)
 376             continue;
 377 
 378         ret =
 379             mc_search__regex_found_cond_one (lc_mc_search, mc_search_cond->regex_handle,
 380                                              search_str);
 381         if (ret != COND__NOT_FOUND)
 382             return ret;
 383     }
 384     return COND__NOT_ALL_FOUND;
 385 }
 386 
 387 /* --------------------------------------------------------------------------------------------- */
 388 
 389 static int
 390 mc_search_regex__get_max_num_of_replace_tokens (const gchar * str, gsize len)
     /*   */
 391 {
 392     int max_token = 0;
 393     gsize loop;
 394     for (loop = 0; loop < len - 1; loop++)
 395     {
 396         if (str[loop] == '\\' && g_ascii_isdigit (str[loop + 1]))
 397         {
 398             if (strutils_is_char_escaped (str, &str[loop]))
 399                 continue;
 400             if (max_token < str[loop + 1] - '0')
 401                 max_token = str[loop + 1] - '0';
 402             continue;
 403         }
 404         if (str[loop] == '$' && str[loop + 1] == '{')
 405         {
 406             gsize tmp_len;
 407 
 408             if (strutils_is_char_escaped (str, &str[loop]))
 409                 continue;
 410 
 411             for (tmp_len = 0;
 412                  loop + tmp_len + 2 < len && (str[loop + 2 + tmp_len] & (char) 0xf0) == 0x30;
 413                  tmp_len++);
 414 
 415             if (str[loop + 2 + tmp_len] == '}')
 416             {
 417                 int tmp_token;
 418                 char *tmp_str;
 419 
 420                 tmp_str = g_strndup (&str[loop + 2], tmp_len);
 421                 tmp_token = atoi (tmp_str);
 422                 if (max_token < tmp_token)
 423                     max_token = tmp_token;
 424                 g_free (tmp_str);
 425             }
 426         }
 427     }
 428     return max_token;
 429 }
 430 
 431 /* --------------------------------------------------------------------------------------------- */
 432 
 433 static char *
 434 mc_search_regex__get_token_by_num (const mc_search_t * lc_mc_search, gsize lc_index)
     /*   */
 435 {
 436     int fnd_start = 0, fnd_end = 0;
 437 
 438 #ifdef SEARCH_TYPE_GLIB
 439     g_match_info_fetch_pos (lc_mc_search->regex_match_info, lc_index, &fnd_start, &fnd_end);
 440 #else /* SEARCH_TYPE_GLIB */
 441     fnd_start = lc_mc_search->iovector[lc_index * 2 + 0];
 442     fnd_end = lc_mc_search->iovector[lc_index * 2 + 1];
 443 #endif /* SEARCH_TYPE_GLIB */
 444 
 445     if (fnd_end == fnd_start)
 446         return g_strdup ("");
 447 
 448     return g_strndup (lc_mc_search->regex_buffer->str + fnd_start, fnd_end - fnd_start);
 449 
 450 }
 451 
 452 /* --------------------------------------------------------------------------------------------- */
 453 
 454 static gboolean
 455 mc_search_regex__replace_handle_esc_seq (const GString * replace_str, const gsize current_pos,
     /*   */
 456                                          gsize * skip_len, int *ret)
 457 {
 458     char *curr_str = &(replace_str->str[current_pos]);
 459     char c = curr_str[1];
 460 
 461     if (replace_str->len > current_pos + 2)
 462     {
 463         if (c == '{')
 464         {
 465             for (*skip_len = 2; /* \{ */
 466                  current_pos + *skip_len < replace_str->len && curr_str[*skip_len] >= '0'
 467                  && curr_str[*skip_len] <= '7'; (*skip_len)++)
 468                 ;
 469 
 470             if (current_pos + *skip_len < replace_str->len && curr_str[*skip_len] == '}')
 471             {
 472                 (*skip_len)++;
 473                 *ret = REPLACE_PREPARE_T_ESCAPE_SEQ;
 474                 return FALSE;
 475             }
 476             else
 477             {
 478                 *ret = REPLACE_PREPARE_T_NOTHING_SPECIAL;
 479                 return TRUE;
 480             }
 481         }
 482 
 483         if (c == 'x')
 484         {
 485             *skip_len = 2;      /* \x */
 486             c = curr_str[2];
 487             if (c == '{')
 488             {
 489                 for (*skip_len = 3;     /* \x{ */
 490                      current_pos + *skip_len < replace_str->len
 491                      && g_ascii_isxdigit ((guchar) curr_str[*skip_len]); (*skip_len)++)
 492                     ;
 493 
 494                 if (current_pos + *skip_len < replace_str->len && curr_str[*skip_len] == '}')
 495                 {
 496                     (*skip_len)++;
 497                     *ret = REPLACE_PREPARE_T_ESCAPE_SEQ;
 498                     return FALSE;
 499                 }
 500                 else
 501                 {
 502                     *ret = REPLACE_PREPARE_T_NOTHING_SPECIAL;
 503                     return TRUE;
 504                 }
 505             }
 506             else if (!g_ascii_isxdigit ((guchar) c))
 507             {
 508                 *skip_len = 2;  /* \x without number behind */
 509                 *ret = REPLACE_PREPARE_T_NOTHING_SPECIAL;
 510                 return FALSE;
 511             }
 512             else
 513             {
 514                 c = curr_str[3];
 515                 if (!g_ascii_isxdigit ((guchar) c))
 516                     *skip_len = 3;      /* \xH */
 517                 else
 518                     *skip_len = 4;      /* \xHH */
 519                 *ret = REPLACE_PREPARE_T_ESCAPE_SEQ;
 520                 return FALSE;
 521             }
 522         }
 523     }
 524 
 525     if (strchr ("ntvbrfa", c) != NULL)
 526     {
 527         *skip_len = 2;
 528         *ret = REPLACE_PREPARE_T_ESCAPE_SEQ;
 529         return FALSE;
 530     }
 531     return TRUE;
 532 }
 533 
 534 /* --------------------------------------------------------------------------------------------- */
 535 
 536 static int
 537 mc_search_regex__process_replace_str (const GString * replace_str, const gsize current_pos,
     /*   */
 538                                       gsize * skip_len, replace_transform_type_t * replace_flags)
 539 {
 540     int ret = -1;
 541     const char *curr_str = &(replace_str->str[current_pos]);
 542 
 543     if (current_pos > replace_str->len)
 544         return REPLACE_PREPARE_T_NOTHING_SPECIAL;
 545 
 546     *skip_len = 0;
 547 
 548     if (replace_str->len > current_pos + 2 && curr_str[0] == '$' && curr_str[1] == '{'
 549         && (curr_str[2] & (char) 0xf0) == 0x30)
 550     {
 551         char *tmp_str;
 552 
 553         if (strutils_is_char_escaped (replace_str->str, curr_str))
 554         {
 555             *skip_len = 1;
 556             return REPLACE_PREPARE_T_NOTHING_SPECIAL;
 557         }
 558 
 559         for (*skip_len = 0;
 560              current_pos + *skip_len + 2 < replace_str->len
 561              && (curr_str[2 + *skip_len] & (char) 0xf0) == 0x30; (*skip_len)++)
 562             ;
 563 
 564         if (curr_str[2 + *skip_len] != '}')
 565             return REPLACE_PREPARE_T_NOTHING_SPECIAL;
 566 
 567         tmp_str = g_strndup (curr_str + 2, *skip_len);
 568         if (tmp_str == NULL)
 569             return REPLACE_PREPARE_T_NOTHING_SPECIAL;
 570 
 571         ret = atoi (tmp_str);
 572         g_free (tmp_str);
 573 
 574         *skip_len += 3;         /* ${} */
 575         return ret;             /* capture buffer index >= 0 */
 576     }
 577 
 578     if (curr_str[0] == '\\' && replace_str->len > current_pos + 1)
 579     {
 580         if (strutils_is_char_escaped (replace_str->str, curr_str))
 581         {
 582             *skip_len = 1;
 583             return REPLACE_PREPARE_T_NOTHING_SPECIAL;
 584         }
 585 
 586         if (g_ascii_isdigit (curr_str[1]))
 587         {
 588             ret = g_ascii_digit_value (curr_str[1]);    /* capture buffer index >= 0 */
 589             *skip_len = 2;      /* \\ and one digit */
 590             return ret;
 591         }
 592 
 593         if (!mc_search_regex__replace_handle_esc_seq (replace_str, current_pos, skip_len, &ret))
 594             return ret;
 595 
 596         ret = REPLACE_PREPARE_T_REPLACE_FLAG;
 597         *skip_len += 2;
 598 
 599         switch (curr_str[1])
 600         {
 601         case 'U':
 602             *replace_flags |= REPLACE_T_UPP_TRANSFORM;
 603             *replace_flags &= ~REPLACE_T_LOW_TRANSFORM;
 604             break;
 605         case 'u':
 606             *replace_flags |= REPLACE_T_UPP_TRANSFORM_CHAR;
 607             break;
 608         case 'L':
 609             *replace_flags |= REPLACE_T_LOW_TRANSFORM;
 610             *replace_flags &= ~REPLACE_T_UPP_TRANSFORM;
 611             break;
 612         case 'l':
 613             *replace_flags |= REPLACE_T_LOW_TRANSFORM_CHAR;
 614             break;
 615         case 'E':
 616             *replace_flags = REPLACE_T_NO_TRANSFORM;
 617             break;
 618         default:
 619             ret = REPLACE_PREPARE_T_NOTHING_SPECIAL;
 620             break;
 621         }
 622     }
 623     return ret;
 624 }
 625 
 626 /* --------------------------------------------------------------------------------------------- */
 627 
 628 static void
 629 mc_search_regex__process_append_str (GString * dest_str, const char *from, gsize len,
     /*   */
 630                                      replace_transform_type_t * replace_flags)
 631 {
 632     gsize loop;
 633     gsize char_len;
 634 
 635     if (len == (gsize) (-1))
 636         len = strlen (from);
 637 
 638     if (*replace_flags == REPLACE_T_NO_TRANSFORM)
 639     {
 640         g_string_append_len (dest_str, from, len);
 641         return;
 642     }
 643 
 644     for (loop = 0; loop < len; loop += char_len)
 645     {
 646         GString *tmp_string = NULL;
 647         char *tmp_str;
 648 
 649         tmp_str = mc_search__get_one_symbol (NULL, from + loop, len - loop, NULL);
 650         char_len = strlen (tmp_str);
 651 
 652         if ((*replace_flags & REPLACE_T_UPP_TRANSFORM_CHAR) != 0)
 653         {
 654             *replace_flags &= ~REPLACE_T_UPP_TRANSFORM_CHAR;
 655             tmp_string = mc_search__toupper_case_str (NULL, tmp_str, char_len);
 656             g_string_append_len (dest_str, tmp_string->str, tmp_string->len);
 657             g_string_free (tmp_string, TRUE);
 658         }
 659         else if ((*replace_flags & REPLACE_T_LOW_TRANSFORM_CHAR) != 0)
 660         {
 661             *replace_flags &= ~REPLACE_T_LOW_TRANSFORM_CHAR;
 662             tmp_string = mc_search__tolower_case_str (NULL, tmp_str, char_len);
 663             g_string_append_len (dest_str, tmp_string->str, tmp_string->len);
 664             g_string_free (tmp_string, TRUE);
 665         }
 666         else if ((*replace_flags & REPLACE_T_UPP_TRANSFORM) != 0)
 667         {
 668             tmp_string = mc_search__toupper_case_str (NULL, tmp_str, char_len);
 669             g_string_append_len (dest_str, tmp_string->str, tmp_string->len);
 670             g_string_free (tmp_string, TRUE);
 671         }
 672         else if ((*replace_flags & REPLACE_T_LOW_TRANSFORM) != 0)
 673         {
 674             tmp_string = mc_search__tolower_case_str (NULL, tmp_str, char_len);
 675             g_string_append_len (dest_str, tmp_string->str, tmp_string->len);
 676             g_string_free (tmp_string, TRUE);
 677         }
 678 
 679         g_free (tmp_str);
 680     }
 681 }
 682 
 683 /* --------------------------------------------------------------------------------------------- */
 684 
 685 static void
 686 mc_search_regex__process_escape_sequence (GString * dest_str, const char *from, gsize len,
     /*   */
 687                                           replace_transform_type_t * replace_flags,
 688                                           gboolean is_utf8)
 689 {
 690     gsize i = 0;
 691     unsigned int c = 0;
 692     char b;
 693 
 694     if (len == (gsize) (-1))
 695         len = strlen (from);
 696     if (len == 0)
 697         return;
 698 
 699     if (from[i] == '{')
 700         i++;
 701     if (i >= len)
 702         return;
 703 
 704     if (from[i] == 'x')
 705     {
 706         i++;
 707         if (i < len && from[i] == '{')
 708             i++;
 709         for (; i < len; i++)
 710         {
 711             if (from[i] >= '0' && from[i] <= '9')
 712                 c = c * 16 + from[i] - '0';
 713             else if (from[i] >= 'a' && from[i] <= 'f')
 714                 c = c * 16 + 10 + from[i] - 'a';
 715             else if (from[i] >= 'A' && from[i] <= 'F')
 716                 c = c * 16 + 10 + from[i] - 'A';
 717             else
 718                 break;
 719         }
 720     }
 721     else if (from[i] >= '0' && from[i] <= '7')
 722         for (; i < len && from[i] >= '0' && from[i] <= '7'; i++)
 723             c = c * 8 + from[i] - '0';
 724     else
 725     {
 726         switch (from[i])
 727         {
 728         case 'n':
 729             c = '\n';
 730             break;
 731         case 't':
 732             c = '\t';
 733             break;
 734         case 'v':
 735             c = '\v';
 736             break;
 737         case 'b':
 738             c = '\b';
 739             break;
 740         case 'r':
 741             c = '\r';
 742             break;
 743         case 'f':
 744             c = '\f';
 745             break;
 746         case 'a':
 747             c = '\a';
 748             break;
 749         default:
 750             mc_search_regex__process_append_str (dest_str, from, len, replace_flags);
 751             return;
 752         }
 753     }
 754 
 755     if (c < 0x80 || !is_utf8)
 756         g_string_append_c (dest_str, (char) c);
 757     else if (c < 0x800)
 758     {
 759         b = 0xC0 | (c >> 6);
 760         g_string_append_c (dest_str, b);
 761         b = 0x80 | (c & 0x3F);
 762         g_string_append_c (dest_str, b);
 763     }
 764     else if (c < 0x10000)
 765     {
 766         b = 0xE0 | (c >> 12);
 767         g_string_append_c (dest_str, b);
 768         b = 0x80 | ((c >> 6) & 0x3F);
 769         g_string_append_c (dest_str, b);
 770         b = 0x80 | (c & 0x3F);
 771         g_string_append_c (dest_str, b);
 772     }
 773     else if (c < 0x10FFFF)
 774     {
 775         b = 0xF0 | (c >> 16);
 776         g_string_append_c (dest_str, b);
 777         b = 0x80 | ((c >> 12) & 0x3F);
 778         g_string_append_c (dest_str, b);
 779         b = 0x80 | ((c >> 6) & 0x3F);
 780         g_string_append_c (dest_str, b);
 781         b = 0x80 | (c & 0x3F);
 782         g_string_append_c (dest_str, b);
 783     }
 784 }
 785 
 786 /* --------------------------------------------------------------------------------------------- */
 787 /*** public functions ****************************************************************************/
 788 /* --------------------------------------------------------------------------------------------- */
 789 
 790 void
 791 mc_search__cond_struct_new_init_regex (const char *charset, mc_search_t * lc_mc_search,
     /*   */
 792                                        mc_search_cond_t * mc_search_cond)
 793 {
 794     if (lc_mc_search->whole_words && !lc_mc_search->is_entire_line)
 795     {
 796         /* NOTE: \b as word boundary doesn't allow search
 797          * whole words with non-ASCII symbols.
 798          * Update: Is it still true nowadays? Probably not. #2396, #3524 */
 799         g_string_prepend (mc_search_cond->str, "(?<![\\p{L}\\p{N}_])");
 800         g_string_append (mc_search_cond->str, "(?![\\p{L}\\p{N}_])");
 801     }
 802 
 803     {
 804 #ifdef SEARCH_TYPE_GLIB
 805         GError *mcerror = NULL;
 806         GRegexCompileFlags g_regex_options = G_REGEX_OPTIMIZE | G_REGEX_DOTALL;
 807 
 808         if (str_isutf8 (charset) && mc_global.utf8_display)
 809         {
 810             if (!lc_mc_search->is_case_sensitive)
 811                 g_regex_options |= G_REGEX_CASELESS;
 812         }
 813         else
 814         {
 815             g_regex_options |= G_REGEX_RAW;
 816 
 817             if (!lc_mc_search->is_case_sensitive)
 818             {
 819                 GString *tmp;
 820 
 821                 tmp = mc_search_cond->str;
 822                 mc_search_cond->str = mc_search__cond_struct_new_regex_ci_str (charset, tmp);
 823                 g_string_free (tmp, TRUE);
 824             }
 825         }
 826 
 827         mc_search_cond->regex_handle =
 828             g_regex_new (mc_search_cond->str->str, g_regex_options, 0, &mcerror);
 829 
 830         if (mcerror != NULL)
 831         {
 832             lc_mc_search->error = MC_SEARCH_E_REGEX_COMPILE;
 833             g_free (lc_mc_search->error_str);
 834             lc_mc_search->error_str =
 835                 str_conv_gerror_message (mcerror, _("Regular expression error"));
 836             g_error_free (mcerror);
 837             return;
 838         }
 839 #else /* SEARCH_TYPE_GLIB */
 840         const char *error;
 841         int erroffset;
 842         int pcre_options = PCRE_EXTRA | PCRE_MULTILINE;
 843 
 844         if (str_isutf8 (charset) && mc_global.utf8_display)
 845         {
 846             pcre_options |= PCRE_UTF8;
 847             if (!lc_mc_search->is_case_sensitive)
 848                 pcre_options |= PCRE_CASELESS;
 849         }
 850         else if (!lc_mc_search->is_case_sensitive)
 851         {
 852             GString *tmp;
 853 
 854             tmp = mc_search_cond->str;
 855             mc_search_cond->str = mc_search__cond_struct_new_regex_ci_str (charset, tmp);
 856             g_string_free (tmp, TRUE);
 857         }
 858 
 859         mc_search_cond->regex_handle =
 860             pcre_compile (mc_search_cond->str->str, pcre_options, &error, &erroffset, NULL);
 861         if (mc_search_cond->regex_handle == NULL)
 862         {
 863             mc_search_set_error (lc_mc_search, MC_SEARCH_E_REGEX_COMPILE, "%s", error);
 864             return;
 865         }
 866         lc_mc_search->regex_match_info = pcre_study (mc_search_cond->regex_handle, 0, &error);
 867         if (lc_mc_search->regex_match_info == NULL && error != NULL)
 868         {
 869             mc_search_set_error (lc_mc_search, MC_SEARCH_E_REGEX_COMPILE, "%s", error);
 870             MC_PTR_FREE (mc_search_cond->regex_handle);
 871             return;
 872         }
 873 #endif /* SEARCH_TYPE_GLIB */
 874     }
 875 
 876     lc_mc_search->is_utf8 = str_isutf8 (charset);
 877 }
 878 
 879 /* --------------------------------------------------------------------------------------------- */
 880 
 881 gboolean
 882 mc_search__run_regex (mc_search_t * lc_mc_search, const void *user_data,
     /*   */
 883                       gsize start_search, gsize end_search, gsize * found_len)
 884 {
 885     mc_search_cbret_t ret = MC_SEARCH_CB_NOTFOUND;
 886     gsize current_pos, virtual_pos;
 887     gint start_pos;
 888     gint end_pos;
 889 
 890     if (lc_mc_search->regex_buffer != NULL)
 891         g_string_set_size (lc_mc_search->regex_buffer, 0);
 892     else
 893         lc_mc_search->regex_buffer = g_string_sized_new (64);
 894 
 895     virtual_pos = current_pos = start_search;
 896     while (virtual_pos <= end_search)
 897     {
 898         g_string_set_size (lc_mc_search->regex_buffer, 0);
 899         lc_mc_search->start_buffer = current_pos;
 900 
 901         if (lc_mc_search->search_fn != NULL)
 902         {
 903             while (TRUE)
 904             {
 905                 int current_chr = '\n'; /* stop search symbol */
 906 
 907                 ret = lc_mc_search->search_fn (user_data, current_pos, &current_chr);
 908 
 909                 if (ret == MC_SEARCH_CB_ABORT)
 910                     break;
 911 
 912                 if (ret == MC_SEARCH_CB_INVALID)
 913                     continue;
 914 
 915                 current_pos++;
 916 
 917                 if (ret == MC_SEARCH_CB_SKIP)
 918                     continue;
 919 
 920                 virtual_pos++;
 921 
 922                 g_string_append_c (lc_mc_search->regex_buffer, (char) current_chr);
 923 
 924                 if ((char) current_chr == '\n' || virtual_pos > end_search)
 925                     break;
 926             }
 927         }
 928         else
 929         {
 930             /* optimization for standard case (for search from file manager)
 931              *  where there is no MC_SEARCH_CB_INVALID or MC_SEARCH_CB_SKIP
 932              *  return codes, so we can copy line at regex buffer all at once
 933              */
 934             while (TRUE)
 935             {
 936                 const char current_chr = ((const char *) user_data)[current_pos];
 937 
 938                 if (current_chr == '\0')
 939                     break;
 940 
 941                 current_pos++;
 942 
 943                 if (current_chr == '\n' || current_pos > end_search)
 944                     break;
 945             }
 946 
 947             /* use virtual_pos as index of start of current chunk */
 948             g_string_append_len (lc_mc_search->regex_buffer, (const char *) user_data + virtual_pos,
 949                                  current_pos - virtual_pos);
 950             virtual_pos = current_pos;
 951         }
 952 
 953         switch (mc_search__regex_found_cond (lc_mc_search, lc_mc_search->regex_buffer))
 954         {
 955         case COND__FOUND_OK:
 956 #ifdef SEARCH_TYPE_GLIB
 957             g_match_info_fetch_pos (lc_mc_search->regex_match_info, 0, &start_pos, &end_pos);
 958 #else /* SEARCH_TYPE_GLIB */
 959             start_pos = lc_mc_search->iovector[0];
 960             end_pos = lc_mc_search->iovector[1];
 961 #endif /* SEARCH_TYPE_GLIB */
 962             if (found_len != NULL)
 963                 *found_len = end_pos - start_pos;
 964             lc_mc_search->normal_offset = lc_mc_search->start_buffer + start_pos;
 965             return TRUE;
 966         case COND__NOT_ALL_FOUND:
 967             break;
 968         default:
 969             g_string_free (lc_mc_search->regex_buffer, TRUE);
 970             lc_mc_search->regex_buffer = NULL;
 971             return FALSE;
 972         }
 973 
 974         if ((lc_mc_search->update_fn != NULL) &&
 975             ((lc_mc_search->update_fn) (user_data, current_pos) == MC_SEARCH_CB_ABORT))
 976             ret = MC_SEARCH_CB_ABORT;
 977 
 978         if (ret == MC_SEARCH_CB_ABORT || ret == MC_SEARCH_CB_NOTFOUND)
 979             break;
 980     }
 981 
 982     g_string_free (lc_mc_search->regex_buffer, TRUE);
 983     lc_mc_search->regex_buffer = NULL;
 984 
 985     MC_PTR_FREE (lc_mc_search->error_str);
 986     lc_mc_search->error = ret == MC_SEARCH_CB_ABORT ? MC_SEARCH_E_ABORT : MC_SEARCH_E_NOTFOUND;
 987 
 988     return FALSE;
 989 }
 990 
 991 /* --------------------------------------------------------------------------------------------- */
 992 
 993 GString *
 994 mc_search_regex_prepare_replace_str (mc_search_t * lc_mc_search, GString * replace_str)
     /*   */
 995 {
 996     GString *ret;
 997 
 998     int num_replace_tokens;
 999     gsize loop;
1000     gsize prev = 0;
1001     replace_transform_type_t replace_flags = REPLACE_T_NO_TRANSFORM;
1002 
1003     num_replace_tokens =
1004         mc_search_regex__get_max_num_of_replace_tokens (replace_str->str, replace_str->len);
1005 
1006     if (lc_mc_search->num_results < 0)
1007         return mc_g_string_dup (replace_str);
1008 
1009     if (num_replace_tokens > lc_mc_search->num_results - 1
1010         || num_replace_tokens > MC_SEARCH__NUM_REPLACE_ARGS)
1011     {
1012         mc_search_set_error (lc_mc_search, MC_SEARCH_E_REGEX_REPLACE, "%s",
1013                              _(STR_E_RPL_NOT_EQ_TO_FOUND));
1014         return NULL;
1015     }
1016 
1017     ret = g_string_sized_new (64);
1018 
1019     for (loop = 0; loop < replace_str->len - 1; loop++)
1020     {
1021         int lc_index;
1022         gchar *tmp_str;
1023         gsize len = 0;
1024 
1025         lc_index = mc_search_regex__process_replace_str (replace_str, loop, &len, &replace_flags);
1026 
1027         if (lc_index == REPLACE_PREPARE_T_NOTHING_SPECIAL)
1028         {
1029             if (len != 0)
1030             {
1031                 mc_search_regex__process_append_str (ret, replace_str->str + prev, loop - prev,
1032                                                      &replace_flags);
1033                 mc_search_regex__process_append_str (ret, replace_str->str + loop + 1, len - 1,
1034                                                      &replace_flags);
1035                 prev = loop + len;
1036                 loop = prev - 1;        /* prepare to loop++ */
1037             }
1038 
1039             continue;
1040         }
1041 
1042         if (lc_index == REPLACE_PREPARE_T_REPLACE_FLAG)
1043         {
1044             if (loop != 0)
1045                 mc_search_regex__process_append_str (ret, replace_str->str + prev, loop - prev,
1046                                                      &replace_flags);
1047             prev = loop + len;
1048             loop = prev - 1;    /* prepare to loop++ */
1049             continue;
1050         }
1051 
1052         /* escape sequence */
1053         if (lc_index == REPLACE_PREPARE_T_ESCAPE_SEQ)
1054         {
1055             mc_search_regex__process_append_str (ret, replace_str->str + prev, loop - prev,
1056                                                  &replace_flags);
1057             /* call process_escape_sequence without starting '\\' */
1058             mc_search_regex__process_escape_sequence (ret, replace_str->str + loop + 1, len - 1,
1059                                                       &replace_flags, lc_mc_search->is_utf8);
1060             prev = loop + len;
1061             loop = prev - 1;    /* prepare to loop++ */
1062             continue;
1063         }
1064 
1065         /* invalid capture buffer number */
1066         if (lc_index > lc_mc_search->num_results)
1067         {
1068             g_string_free (ret, TRUE);
1069             mc_search_set_error (lc_mc_search, MC_SEARCH_E_REGEX_REPLACE,
1070                                  _(STR_E_RPL_INVALID_TOKEN), lc_index);
1071             return NULL;
1072         }
1073 
1074         tmp_str = mc_search_regex__get_token_by_num (lc_mc_search, lc_index);
1075 
1076         if (loop != 0)
1077             mc_search_regex__process_append_str (ret, replace_str->str + prev, loop - prev,
1078                                                  &replace_flags);
1079 
1080         mc_search_regex__process_append_str (ret, tmp_str, -1, &replace_flags);
1081         g_free (tmp_str);
1082 
1083         prev = loop + len;
1084         loop = prev - 1;        /* prepare to loop++ */
1085     }
1086 
1087     mc_search_regex__process_append_str (ret, replace_str->str + prev, replace_str->len - prev,
1088                                          &replace_flags);
1089 
1090     return ret;
1091 }
/* */
root/lib/search/regex.c

DEFINITIONS
