lib/ansi/asctime.c

   1 /*
   2  * asctime - print a date
   3  */
   4 /* $Header$ */
   5
   6 #include        <string.h>
   7 #include        <time.h>
   8 #include        "loc_time.h"
   9
  10 #define DATE_STR        "??? ??? ?? ??:??:?? ????\n"
  11
  12 static char *
  13 two_digits(register char *pb, int i, int nospace)
  14 {
  15         *pb = (i / 10) % 10 + '0';
  16         if (!nospace && *pb == '0') *pb = ' ';
  17         pb++;
  18         *pb++ = (i % 10) + '0';
  19         return ++pb;
  20 }
  21
  22 static char *
  23 four_digits(register char *pb, int i)
  24 {
  25         i %= 10000;
  26         *pb++ = (i / 1000) + '0';
  27         i %= 1000;
  28         *pb++ = (i / 100) + '0';
  29         i %= 100;
  30         *pb++ = (i / 10) + '0';
  31         *pb++ = (i % 10) + '0';
  32         return ++pb;
  33 }
  34
  35 char *asctime(const struct tm *timeptr)
  36 {
  37         static char buf[26];
  38         register char *pb = buf;
  39         register const char *ps;
  40         register int n;
  41
  42         strcpy(pb, DATE_STR);
  43         ps = _days[timeptr->tm_wday];
  44         n = ABB_LEN;
  45         while(--n >= 0) *pb++ = *ps++;
  46         pb++;
  47         ps = _months[timeptr->tm_mon];
  48         n = ABB_LEN;
  49         while(--n >= 0) *pb++ = *ps++;
  50         pb++;
  51         pb = two_digits(
  52                     two_digits(
  53                             two_digits(two_digits(pb, timeptr->tm_mday, 0)
  54                                         , timeptr->tm_hour, 1)
  55                             , timeptr->tm_min, 1)
  56                     , timeptr->tm_sec, 1);
  57
  58         four_digits(pb, timeptr->tm_year + 1900);
  59         return buf;
  60 }