stdtime/asctime-fbsd.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(const struct tm * __restrict timeptr, char * __restrict buf)
  27 {
  28         static const char       wday_name[][3] = {
  29                 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  30         };
  31         static const char       mon_name[][3] = {
  32                 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  33                 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  34         };
  35         const char *    wn;
  36         const char *    mn;
  37
  38         if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
  39                 wn = "???";
  40         else    wn = wday_name[timeptr->tm_wday];
  41         if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
  42                 mn = "???";
  43         else    mn = mon_name[timeptr->tm_mon];
  44         /*
  45         ** The X3J11-suggested format is
  46         **      "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n"
  47         ** Since the .2 in 02.2d is ignored, we drop it.
  48         */
  49         (void) sprintf(buf, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
  50                 wn, mn,
  51                 timeptr->tm_mday, timeptr->tm_hour,
  52                 timeptr->tm_min, timeptr->tm_sec,
  53                 TM_YEAR_BASE + timeptr->tm_year);
  54         return buf;
  55 }
  56
  57 /*
  58 ** A la X3J11, with core dump avoidance.
  59 */
  60
  61 char *
  62 asctime(timeptr)
  63 const struct tm *       timeptr;
  64 {
  65         /*
  66         ** Big enough for something such as
  67         ** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
  68         ** (two three-character abbreviations, five strings denoting integers,
  69         ** three explicit spaces, two explicit colons, a newline,
  70         ** and a trailing ASCII nul).
  71         */
  72         static char             result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
  73                                         3 + 2 + 1 + 1];
  74
  75         return asctime_r(timeptr, result);
  76 }