1 /* 2 Time formatting functions 3 4 Copyright (C) 1994-2022 5 Free Software Foundation, Inc. 6 7 Written by: 8 Miguel de Icaza, 1994, 1995, 1996 9 Janne Kukonlehto, 1994, 1995, 1996 10 Dugan Porter, 1994, 1995, 1996 11 Jakub Jelinek, 1994, 1995, 1996 12 Mauricio Plaza, 1994, 1995, 1996 13 14 The file_date routine is mostly from GNU's fileutils package, 15 written by Richard Stallman and David MacKenzie. 16 17 This file is part of the Midnight Commander. 18 19 The Midnight Commander is free software: you can redistribute it 20 and/or modify it under the terms of the GNU General Public License as 21 published by the Free Software Foundation, either version 3 of the License, 22 or (at your option) any later version. 23 24 The Midnight Commander is distributed in the hope that it will be useful, 25 but WITHOUT ANY WARRANTY; without even the implied warranty of 26 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 27 GNU General Public License for more details. 28 29 You should have received a copy of the GNU General Public License 30 along with this program. If not, see <http://www.gnu.org/licenses/>. 31 */ 32 33 /** \file 34 * \brief Source: time formatting functions 35 */ 36 37 #include <config.h> 38 39 #include <stdlib.h> 40 #include <limits.h> /* MB_LEN_MAX */ 41 42 #include "lib/global.h" 43 #include "lib/strutil.h" 44 45 #include "lib/timefmt.h" 46 47 /*** global variables ****************************************************************************/ 48 49 char *user_recent_timeformat = NULL; /* time format string for recent dates */ 50 char *user_old_timeformat = NULL; /* time format string for older dates */ 51 52 /*** file scope macro definitions ****************************************************************/ 53 54 /*** file scope type declarations ****************************************************************/ 55 56 /*** file scope variables ************************************************************************/ 57 58 /* 59 * Cache variable for the i18n_checktimelength function, 60 * initially set to a clearly invalid value to show that 61 * it hasn't been initialized yet. 62 */ 63 static size_t i18n_timelength_cache = MAX_I18NTIMELENGTH + 1; 64 65 /*** file scope functions ************************************************************************/ 66 67 /*** public functions ****************************************************************************/ 68 69 /* --------------------------------------------------------------------------------------------- */ 70 /** 71 * Check strftime() results. Some systems (i.e. Solaris) have different 72 * short-month and month name sizes for different locales 73 */ 74 size_t 75 i18n_checktimelength (void) /**/ 76 { 77 size_t length = 0; 78 time_t testtime; 79 struct tm *lt; 80 81 if (i18n_timelength_cache <= MAX_I18NTIMELENGTH) 82 return i18n_timelength_cache; 83 84 testtime = time (NULL); 85 lt = localtime (&testtime); 86 87 if (lt == NULL) 88 { 89 /* huh, localtime() doesnt seem to work ... falling back to "(invalid)" */ 90 length = str_term_width1 (_(INVALID_TIME_TEXT)); 91 } 92 else 93 { 94 char buf[MB_LEN_MAX * MAX_I18NTIMELENGTH + 1]; 95 size_t tlen; 96 97 /* We are interested in the longest possible date */ 98 lt->tm_sec = lt->tm_min = lt->tm_hour = lt->tm_mday = 10; 99 100 /* Loop through all months to find out the longest one */ 101 for (lt->tm_mon = 0; lt->tm_mon < 12; lt->tm_mon++) 102 { 103 strftime (buf, sizeof (buf) - 1, user_recent_timeformat, lt); 104 tlen = (size_t) str_term_width1 (buf); 105 length = MAX (tlen, length); 106 strftime (buf, sizeof (buf) - 1, user_old_timeformat, lt); 107 tlen = (size_t) str_term_width1 (buf); 108 length = MAX (tlen, length); 109 } 110 111 tlen = (size_t) str_term_width1 (_(INVALID_TIME_TEXT)); 112 length = MAX (tlen, length); 113 } 114 115 /* Don't handle big differences. Use standard value (email bug, please) */ 116 if (length > MAX_I18NTIMELENGTH || length < MIN_I18NTIMELENGTH) 117 length = STD_I18NTIMELENGTH; 118 119 /* Save obtained value to the cache */ 120 i18n_timelength_cache = length; 121 122 return i18n_timelength_cache; 123 } 124 125 /* --------------------------------------------------------------------------------------------- */ 126 127 const char * 128 file_date (time_t when) /*
*/ 129 { 130 static char timebuf[MB_LEN_MAX * MAX_I18NTIMELENGTH + 1]; 131 time_t current_time = time (NULL); 132 const char *fmt; 133 134 if (current_time > when + 6L * 30L * 24L * 60L * 60L /* Old. */ 135 || current_time < when - 60L * 60L) /* In the future. */ 136 /* The file is fairly old or in the future. 137 POSIX says the cutoff is 6 months old; 138 approximate this by 6*30 days. 139 Allow a 1 hour slop factor for what is considered "the future", 140 to allow for NFS server/client clock disagreement. 141 Show the year instead of the time of day. */ 142 143 fmt = user_old_timeformat; 144 else 145 fmt = user_recent_timeformat; 146 147 FMT_LOCALTIME (timebuf, sizeof (timebuf), fmt, when); 148 149 return timebuf; 150 } 151 152 /* --------------------------------------------------------------------------------------------- */