stdtime/FreeBSD/asctime.c

   1 /*
   2 ** This file is in the public domain, so clarified as of
   3 ** June 5, 1996 by Arthur David Olson (arthur_david_olson@nih.gov).
   4 */
   5
   6 #include <sys/cdefs.h>
   7 #ifndef lint
   8 #ifndef NOID
   9 static char     elsieid[] __unused = "@(#)asctime.c     7.7";
  10 #endif /* !defined NOID */
  11 #endif /* !defined lint */
  12 __FBSDID("$FreeBSD: src/lib/libc/stdtime/asctime.c,v 1.11 2003/02/16 17:29:11 nectar Exp $");
  13
  14 /*LINTLIBRARY*/
  15
  16 #include "namespace.h"
  17 #include "private.h"
  18 #include "un-namespace.h"
  19 #include "tzfile.h"
  20
  21 /*
  22 ** A la X3J11, with core dump avoidance.
  23 */
  24
  25
  26 char *
  27 asctime(timeptr)
  28 const struct tm *       timeptr;
  29 {
  30         static char             result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
  31                                         3 + 2 + 1 + 1];
  32         return(asctime_r(timeptr, result));
  33 }
  34
  35 char *
  36 asctime_r(timeptr, result)
  37 const struct tm *       timeptr;
  38 char *result;
  39 {
  40         static const char       wday_name[][3] = {
  41                 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  42         };
  43         static const char       mon_name[][3] = {
  44                 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  45                 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  46         };
  47         /*
  48         ** Big enough for something such as
  49         ** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
  50         ** (two three-character abbreviations, five strings denoting integers,
  51         ** three explicit spaces, two explicit colons, a newline,
  52         ** and a trailing ASCII nul).
  53         */
  54         const char *    wn;
  55         const char *    mn;
  56
  57         if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
  58                 wn = "???";
  59         else    wn = wday_name[timeptr->tm_wday];
  60         if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
  61                 mn = "???";
  62         else    mn = mon_name[timeptr->tm_mon];
  63         /*
  64         ** The X3J11-suggested format is
  65         **      "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n"
  66         ** Since the .2 in 02.2d is ignored, we drop it.
  67         */
  68         (void) sprintf(result, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
  69                 wn, mn,
  70                 timeptr->tm_mday, timeptr->tm_hour,
  71                 timeptr->tm_min, timeptr->tm_sec,
  72                 TM_YEAR_BASE + timeptr->tm_year);
  73         return result;
  74 }