usr/src/lib/libast/common/comp/strftime.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23 /*
  24  * strftime implementation
  25  */
  26
  27 #define strftime        ______strftime
  28
  29 #include <ast.h>
  30 #include <tm.h>
  31
  32 #undef  strftime
  33
  34 #undef  _def_map_ast
  35 #include <ast_map.h>
  36
  37 #undef  _lib_strftime   /* we can pass X/Open */
  38
  39 #if _lib_strftime
  40
  41 NoN(strftime)
  42
  43 #else
  44
  45 #if defined(__EXPORT__)
  46 #define extern  __EXPORT__
  47 #endif
  48
  49 extern size_t
  50 strftime(char* buf, size_t len, const char* format, const struct tm* tm)
  51 {
  52         register char*  s;
  53         time_t          t;
  54         Tm_t            tl;
  55
  56         memset(&tl, 0, sizeof(tl));
  57
  58         /*
  59          * nl_langinfo() may call strftime() with bogus tm except for
  60          * one value -- what a way to go
  61          */
  62
  63         if (tm->tm_sec < 0 || tm->tm_sec > 60 ||
  64             tm->tm_min < 0 || tm->tm_min > 59 ||
  65             tm->tm_hour < 0 || tm->tm_hour > 23 ||
  66             tm->tm_wday < 0 || tm->tm_wday > 6 ||
  67             tm->tm_mday < 1 || tm->tm_mday > 31 ||
  68             tm->tm_mon < 0 || tm->tm_mon > 11 ||
  69             tm->tm_year < 0 || tm->tm_year > (2138 - 1900))
  70         {
  71                 if (tm->tm_sec >= 0 && tm->tm_sec <= 60)
  72                         tl.tm_sec = tm->tm_sec;
  73                 if (tm->tm_min >= 0 && tm->tm_min <= 59)
  74                         tl.tm_min = tm->tm_min;
  75                 if (tm->tm_hour >= 0 && tm->tm_hour <= 23)
  76                         tl.tm_hour = tm->tm_hour;
  77                 if (tm->tm_wday >= 0 && tm->tm_wday <= 6)
  78                         tl.tm_wday = tm->tm_wday;
  79                 if (tm->tm_mday >= 0 && tm->tm_mday <= 31)
  80                         tl.tm_mday = tm->tm_mday;
  81                 if (tm->tm_mon >= 0 && tm->tm_mon <= 11)
  82                         tl.tm_mon = tm->tm_mon;
  83                 if (tm->tm_year >= 0 && tm->tm_year <= (2138 - 1900))
  84                         tl.tm_year = tm->tm_year;
  85         }
  86         else
  87         {
  88                 tl.tm_sec = tm->tm_sec;
  89                 tl.tm_min = tm->tm_min;
  90                 tl.tm_hour = tm->tm_hour;
  91                 tl.tm_mday = tm->tm_mday;
  92                 tl.tm_mon = tm->tm_mon;
  93                 tl.tm_year = tm->tm_year;
  94                 tl.tm_wday = tm->tm_wday;
  95                 tl.tm_yday = tm->tm_yday;
  96                 tl.tm_isdst = tm->tm_isdst;
  97         }
  98         t = tmtime(&tl, TM_LOCALZONE);
  99         if (!(s = tmfmt(buf, len, format, &t)))
 100                 return 0;
 101         return s - buf;
 102 }
 103
 104 #endif