lib/timefmt.c

   1 /*
   2    Time formatting functions
   3
   4    Copyright (C) 1994-2016
   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
  41 #include "lib/global.h"
  42 #include "lib/strutil.h"
  43
  44 #include "lib/timefmt.h"
  45
  46 /*** global variables ****************************************************************************/
  47
  48 char *user_recent_timeformat = NULL;    /* time format string for recent dates */
  49 char *user_old_timeformat = NULL;       /* time format string for older dates */
  50
  51 /*** file scope macro definitions ****************************************************************/
  52
  53 /*** file scope type declarations ****************************************************************/
  54
  55 /*** file scope variables ************************************************************************/
  56
  57 /*
  58  * Cache variable for the i18n_checktimelength function,
  59  * initially set to a clearly invalid value to show that
  60  * it hasn't been initialized yet.
  61  */
  62 static size_t i18n_timelength_cache = MAX_I18NTIMELENGTH + 1;
  63
  64 /*** file scope functions ************************************************************************/
  65
  66 /*** public functions ****************************************************************************/
  67
  68 /* --------------------------------------------------------------------------------------------- */
  69 /**
  70  * Check strftime() results. Some systems (i.e. Solaris) have different
  71  *  short-month and month name sizes for different locales
  72  */
  73 size_t
  74 i18n_checktimelength (void)
  75 {
  76     size_t length = 0;
  77     time_t testtime;
  78     struct tm *lt;
  79
  80     if (i18n_timelength_cache <= MAX_I18NTIMELENGTH)
  81         return i18n_timelength_cache;
  82
  83     testtime = time (NULL);
  84     lt = localtime (&testtime);
  85
  86     if (lt == NULL)
  87     {
  88         /* huh, localtime() doesnt seem to work ... falling back to "(invalid)" */
  89         length = str_term_width1 (_(INVALID_TIME_TEXT));
  90     }
  91     else
  92     {
  93         char buf[MB_LEN_MAX * MAX_I18NTIMELENGTH + 1];
  94         size_t tlen;
  95
  96         /* We are interested in the longest possible date */
  97         lt->tm_sec = lt->tm_min = lt->tm_hour = lt->tm_mday = 10;
  98
  99         /* Loop through all months to find out the longest one */
 100         for (lt->tm_mon = 0; lt->tm_mon < 12; lt->tm_mon++)
 101         {
 102             strftime (buf, sizeof (buf) - 1, user_recent_timeformat, lt);
 103             tlen = (size_t) str_term_width1 (buf);
 104             length = MAX (tlen, length);
 105             strftime (buf, sizeof (buf) - 1, user_old_timeformat, lt);
 106             tlen = (size_t) str_term_width1 (buf);
 107             length = MAX (tlen, length);
 108         }
 109
 110         tlen = (size_t) str_term_width1 (_(INVALID_TIME_TEXT));
 111         length = MAX (tlen, length);
 112     }
 113
 114     /* Don't handle big differences. Use standard value (email bug, please) */
 115     if (length > MAX_I18NTIMELENGTH || length < MIN_I18NTIMELENGTH)
 116         length = STD_I18NTIMELENGTH;
 117
 118     /* Save obtained value to the cache */
 119     i18n_timelength_cache = length;
 120
 121     return i18n_timelength_cache;
 122 }
 123
 124 /* --------------------------------------------------------------------------------------------- */
 125
 126 const char *
 127 file_date (time_t when)
 128 {
 129     static char timebuf[MB_LEN_MAX * MAX_I18NTIMELENGTH + 1];
 130     time_t current_time = time (NULL);
 131     const char *fmt;
 132
 133     if (current_time > when + 6L * 30L * 24L * 60L * 60L        /* Old. */
 134         || current_time < when - 60L * 60L)     /* In the future. */
 135         /* The file is fairly old or in the future.
 136            POSIX says the cutoff is 6 months old;
 137            approximate this by 6*30 days.
 138            Allow a 1 hour slop factor for what is considered "the future",
 139            to allow for NFS server/client clock disagreement.
 140            Show the year instead of the time of day.  */
 141
 142         fmt = user_old_timeformat;
 143     else
 144         fmt = user_recent_timeformat;
 145
 146     FMT_LOCALTIME (timebuf, sizeof (timebuf), fmt, when);
 147
 148     return timebuf;
 149 }
 150
 151 /* --------------------------------------------------------------------------------------------- */