stdtime/FreeBSD/asctime.c

   1 /*
   2 ** This file is in the public domain, so clarified as of
   3 ** 1996-06-05 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     7.9";
  10 #endif /* !defined NOID */
  11 #endif /* !defined lint */
  12 __FBSDID("$FreeBSD: src/lib/libc/stdtime/asctime.c,v 1.12 2004/06/14 10:31:52 stefanf 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 ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, Second Edition, 1996-07-12.
  23 */
  24
  25 char *
  26 asctime_r(timeptr, buf)
  27 const struct tm *       timeptr;
  28 char *                  buf;
  29 {
  30         static const char       wday_name[][3] = {
  31                 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  32         };
  33         static const char       mon_name[][3] = {
  34                 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  35                 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  36         };
  37         const char *    wn;
  38         const char *    mn;
  39
  40         if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
  41                 wn = "???";
  42         else    wn = wday_name[timeptr->tm_wday];
  43         if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
  44                 mn = "???";
  45         else    mn = mon_name[timeptr->tm_mon];
  46         /*
  47         ** The X3J11-suggested format is
  48         **      "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n"
  49         ** Since the .2 in 02.2d is ignored, we drop it.
  50         */
  51         (void) sprintf(buf, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
  52                 wn, mn,
  53                 timeptr->tm_mday, timeptr->tm_hour,
  54                 timeptr->tm_min, timeptr->tm_sec,
  55                 TM_YEAR_BASE + timeptr->tm_year);
  56         return buf;
  57 }
  58
  59 /*
  60 ** A la X3J11, with core dump avoidance.
  61 */
  62
  63 char *
  64 asctime(timeptr)
  65 const struct tm *       timeptr;
  66 {
  67         /*
  68         ** Big enough for something such as
  69         ** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
  70         ** (two three-character abbreviations, five strings denoting integers,
  71         ** three explicit spaces, two explicit colons, a newline,
  72         ** and a trailing ASCII nul).
  73         */
  74         static char             result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
  75                                         3 + 2 + 1 + 1];
  76
  77         return asctime_r(timeptr, result);
  78 }