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strftime.c

/*
 * Modified slightly by Chet Ramey for inclusion in Bash
 */

/*
 * strftime.c
 *
 * Public-domain implementation of ISO C library routine.
 *
 * If you can't do prototypes, get GCC.
 *
 * The C99 standard now specifies just about all of the formats
 * that were additional in the earlier versions of this file.
 *
 * For extensions from SunOS, add SUNOS_EXT.
 * For extensions from HP/UX, add HPUX_EXT.
 * For VMS dates, add VMS_EXT.
 * For complete POSIX semantics, add POSIX_SEMANTICS.
 *
 * The code for %c, %x, and %X follows the C99 specification for
 * the "C" locale.
 *
 * This version ignores LOCALE information.
 * It also doesn't worry about multi-byte characters.
 * So there.
 *
 * This file is also shipped with GAWK (GNU Awk), gawk specific bits of
 * code are included if GAWK is defined.
 *
 * Arnold Robbins
 * January, February, March, 1991
 * Updated March, April 1992
 * Updated April, 1993
 * Updated February, 1994
 * Updated May, 1994
 * Updated January, 1995
 * Updated September, 1995
 * Updated January, 1996
 * Updated July, 1997
 * Updated October, 1999
 * Updated September, 2000
 *
 * Fixes from ado@elsie.nci.nih.gov,
 * February 1991, May 1992
 * Fixes from Tor Lillqvist tml@tik.vtt.fi,
 * May 1993
 * Further fixes from ado@elsie.nci.nih.gov,
 * February 1994
 * %z code from chip@chinacat.unicom.com,
 * Applied September 1995
 * %V code fixed (again) and %G, %g added,
 * January 1996
 * %v code fixed, better configuration,
 * July 1997
 * Moved to C99 specification.
 * September 2000
 */
#include <config.h>

#ifndef GAWK
#include <stdio.h>
#include <ctype.h>
#include <time.h>
#endif
#if defined(TM_IN_SYS_TIME)
#include <sys/types.h>
#include <sys/time.h>
#endif

#include <stdlib.h>
#include <string.h>

/* defaults: season to taste */
#define SUNOS_EXT 1     /* stuff in SunOS strftime routine */
#define VMS_EXT         1     /* include %v for VMS date format */
#define HPUX_EXT  1     /* non-conflicting stuff in HP-UX date */
#ifndef GAWK
#define POSIX_SEMANTICS 1     /* call tzset() if TZ changes */
#endif

#undef strchr     /* avoid AIX weirdness */

extern void tzset(void);
static int weeknumber(const struct tm *timeptr, int firstweekday);
static int iso8601wknum(const struct tm *timeptr);

#ifdef __GNUC__
#define inline    __inline__
#else
#define inline    /**/
#endif

#define range(low, item, hi)  max(low, min(item, hi))

#if !defined(OS2) && !defined(MSDOS) && defined(HAVE_TZNAME)
extern char *tzname[2];
extern int daylight;
#if defined(SOLARIS) || defined(mips)
extern long int timezone, altzone;
#else
extern int timezone, altzone;
#endif
#endif

#undef min  /* just in case */

/* min --- return minimum of two numbers */

static inline int
min(int a, int b)
{
      return (a < b ? a : b);
}

#undef max  /* also, just in case */

/* max --- return maximum of two numbers */

static inline int
max(int a, int b)
{
      return (a > b ? a : b);
}

/* strftime --- produce formatted time */

size_t
strftime(char *s, size_t maxsize, const char *format, const struct tm *timeptr)
{
      char *endp = s + maxsize;
      char *start = s;
      auto char tbuf[100];
      long off;
      int i, w, y;
      static short first = 1;
#ifdef POSIX_SEMANTICS
      static char *savetz = NULL;
      static int savetzlen = 0;
      char *tz;
#endif /* POSIX_SEMANTICS */
#ifndef HAVE_TM_ZONE
#ifndef HAVE_TM_NAME
#ifndef HAVE_TZNAME
      extern char *timezone();
      struct timeval tv;
      struct timezone zone;
#endif /* HAVE_TZNAME */
#endif /* HAVE_TM_NAME */
#endif /* HAVE_TM_ZONE */

      /* various tables, useful in North America */
      static const char *days_a[] = {
            "Sun", "Mon", "Tue", "Wed",
            "Thu", "Fri", "Sat",
      };
      static const char *days_l[] = {
            "Sunday", "Monday", "Tuesday", "Wednesday",
            "Thursday", "Friday", "Saturday",
      };
      static const char *months_a[] = {
            "Jan", "Feb", "Mar", "Apr", "May", "Jun",
            "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
      };
      static const char *months_l[] = {
            "January", "February", "March", "April",
            "May", "June", "July", "August", "September",
            "October", "November", "December",
      };
      static const char *ampm[] = { "AM", "PM", };

      if (s == NULL || format == NULL || timeptr == NULL || maxsize == 0)
            return 0;

      /* quick check if we even need to bother */
      if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize)
            return 0;

#ifndef POSIX_SEMANTICS
      if (first) {
            tzset();
            first = 0;
      }
#else /* POSIX_SEMANTICS */
#if defined (SHELL)
      tz = get_string_value ("TZ");
#else
      tz = getenv("TZ");
#endif
      if (first) {
            if (tz != NULL) {
                  int tzlen = strlen(tz);

                  savetz = (char *) malloc(tzlen + 1);
                  if (savetz != NULL) {
                        savetzlen = tzlen + 1;
                        strcpy(savetz, tz);
                  }
            }
            tzset();
            first = 0;
      }
      /* if we have a saved TZ, and it is different, recapture and reset */
      if (tz && savetz && (tz[0] != savetz[0] || strcmp(tz, savetz) != 0)) {
            i = strlen(tz) + 1;
            if (i > savetzlen) {
                  savetz = (char *) realloc(savetz, i);
                  if (savetz) {
                        savetzlen = i;
                        strcpy(savetz, tz);
                  }
            } else
                  strcpy(savetz, tz);
            tzset();
      }
#endif      /* POSIX_SEMANTICS */

      for (; *format && s < endp - 1; format++) {
            tbuf[0] = '\0';
            if (*format != '%') {
                  *s++ = *format;
                  continue;
            }
      again:
            switch (*++format) {
            case '\0':
                  *s++ = '%';
                  goto out;

            case '%':
                  *s++ = '%';
                  continue;

            case 'a':   /* abbreviated weekday name */
                  if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6)
                        strcpy(tbuf, "?");
                  else
                        strcpy(tbuf, days_a[timeptr->tm_wday]);
                  break;

            case 'A':   /* full weekday name */
                  if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6)
                        strcpy(tbuf, "?");
                  else
                        strcpy(tbuf, days_l[timeptr->tm_wday]);
                  break;

            case 'b':   /* abbreviated month name */
            short_month:
                  if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11)
                        strcpy(tbuf, "?");
                  else
                        strcpy(tbuf, months_a[timeptr->tm_mon]);
                  break;

            case 'B':   /* full month name */
                  if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11)
                        strcpy(tbuf, "?");
                  else
                        strcpy(tbuf, months_l[timeptr->tm_mon]);
                  break;

            case 'c':   /* appropriate date and time representation */
                  /*
                   * This used to be:
                   *
                   * strftime(tbuf, sizeof tbuf, "%a %b %e %H:%M:%S %Y", timeptr);
                   *
                   * Now, per the ISO 1999 C standard, it this:
                   */
                  strftime(tbuf, sizeof tbuf, "%A %B %d %T %Y", timeptr);
                  break;

            case 'C':
            century:
                  sprintf(tbuf, "%02d", (timeptr->tm_year + 1900) / 100);
                  break;

            case 'd':   /* day of the month, 01 - 31 */
                  i = range(1, timeptr->tm_mday, 31);
                  sprintf(tbuf, "%02d", i);
                  break;

            case 'D':   /* date as %m/%d/%y */
                  strftime(tbuf, sizeof tbuf, "%m/%d/%y", timeptr);
                  break;

            case 'e':   /* day of month, blank padded */
                  sprintf(tbuf, "%2d", range(1, timeptr->tm_mday, 31));
                  break;

            case 'E':
                  /* POSIX (now C99) locale extensions, ignored for now */
                  goto again;

            case 'F':   /* ISO 8601 date representation */
                  strftime(tbuf, sizeof tbuf, "%Y-%m-%d", timeptr);
                  break;

            case 'g':
            case 'G':
                  /*
                   * Year of ISO week.
                   *
                   * If it's December but the ISO week number is one,
                   * that week is in next year.
                   * If it's January but the ISO week number is 52 or
                   * 53, that week is in last year.
                   * Otherwise, it's this year.
                   */
                  w = iso8601wknum(timeptr);
                  if (timeptr->tm_mon == 11 && w == 1)
                        y = 1900 + timeptr->tm_year + 1;
                  else if (timeptr->tm_mon == 0 && w >= 52)
                        y = 1900 + timeptr->tm_year - 1;
                  else
                        y = 1900 + timeptr->tm_year;

                  if (*format == 'G')
                        sprintf(tbuf, "%d", y);
                  else
                        sprintf(tbuf, "%02d", y % 100);
                  break;

            case 'h':   /* abbreviated month name */
                  goto short_month;

            case 'H':   /* hour, 24-hour clock, 00 - 23 */
                  i = range(0, timeptr->tm_hour, 23);
                  sprintf(tbuf, "%02d", i);
                  break;

            case 'I':   /* hour, 12-hour clock, 01 - 12 */
                  i = range(0, timeptr->tm_hour, 23);
                  if (i == 0)
                        i = 12;
                  else if (i > 12)
                        i -= 12;
                  sprintf(tbuf, "%02d", i);
                  break;

            case 'j':   /* day of the year, 001 - 366 */
                  sprintf(tbuf, "%03d", timeptr->tm_yday + 1);
                  break;

            case 'm':   /* month, 01 - 12 */
                  i = range(0, timeptr->tm_mon, 11);
                  sprintf(tbuf, "%02d", i + 1);
                  break;

            case 'M':   /* minute, 00 - 59 */
                  i = range(0, timeptr->tm_min, 59);
                  sprintf(tbuf, "%02d", i);
                  break;

            case 'n':   /* same as \n */
                  tbuf[0] = '\n';
                  tbuf[1] = '\0';
                  break;

            case 'O':
                  /* POSIX (now C99) locale extensions, ignored for now */
                  goto again;

            case 'p':   /* am or pm based on 12-hour clock */
                  i = range(0, timeptr->tm_hour, 23);
                  if (i < 12)
                        strcpy(tbuf, ampm[0]);
                  else
                        strcpy(tbuf, ampm[1]);
                  break;

            case 'r':   /* time as %I:%M:%S %p */
                  strftime(tbuf, sizeof tbuf, "%I:%M:%S %p", timeptr);
                  break;

            case 'R':   /* time as %H:%M */
                  strftime(tbuf, sizeof tbuf, "%H:%M", timeptr);
                  break;

#if defined(HAVE_MKTIME) || defined(GAWK)
            case 's':   /* time as seconds since the Epoch */
            {
                  struct tm non_const_timeptr;

                  non_const_timeptr = *timeptr;
                  sprintf(tbuf, "%ld", mktime(& non_const_timeptr));
                  break;
            }
#endif /* defined(HAVE_MKTIME) || defined(GAWK) */

            case 'S':   /* second, 00 - 60 */
                  i = range(0, timeptr->tm_sec, 60);
                  sprintf(tbuf, "%02d", i);
                  break;

            case 't':   /* same as \t */
                  tbuf[0] = '\t';
                  tbuf[1] = '\0';
                  break;

            case 'T':   /* time as %H:%M:%S */
            the_time:
                  strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr);
                  break;

            case 'u':
            /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */
                  sprintf(tbuf, "%d", timeptr->tm_wday == 0 ? 7 :
                              timeptr->tm_wday);
                  break;

            case 'U':   /* week of year, Sunday is first day of week */
                  sprintf(tbuf, "%02d", weeknumber(timeptr, 0));
                  break;

            case 'V':   /* week of year according ISO 8601 */
                  sprintf(tbuf, "%02d", iso8601wknum(timeptr));
                  break;

            case 'w':   /* weekday, Sunday == 0, 0 - 6 */
                  i = range(0, timeptr->tm_wday, 6);
                  sprintf(tbuf, "%d", i);
                  break;

            case 'W':   /* week of year, Monday is first day of week */
                  sprintf(tbuf, "%02d", weeknumber(timeptr, 1));
                  break;

            case 'x':   /* appropriate date representation */
                  strftime(tbuf, sizeof tbuf, "%A %B %d %Y", timeptr);
                  break;

            case 'X':   /* appropriate time representation */
                  goto the_time;
                  break;

            case 'y':   /* year without a century, 00 - 99 */
            year:
                  i = timeptr->tm_year % 100;
                  sprintf(tbuf, "%02d", i);
                  break;

            case 'Y':   /* year with century */
            fullyear:
                  sprintf(tbuf, "%d", 1900 + timeptr->tm_year);
                  break;

            /*
             * From: Chip Rosenthal <chip@chinacat.unicom.com>
             * Date: Sun, 19 Mar 1995 00:33:29 -0600 (CST)
             * 
             * Warning: the %z [code] is implemented by inspecting the
             * timezone name conditional compile settings, and
             * inferring a method to get timezone offsets. I've tried
             * this code on a couple of machines, but I don't doubt
             * there is some system out there that won't like it.
             * Maybe the easiest thing to do would be to bracket this
             * with an #ifdef that can turn it off. The %z feature
             * would be an admittedly obscure one that most folks can
             * live without, but it would be a great help to those of
             * us that muck around with various message processors.
             */
            case 'z':   /* time zone offset east of GMT e.g. -0600 */
#ifdef HAVE_TM_NAME
                  /*
                   * Systems with tm_name probably have tm_tzadj as
                   * secs west of GMT.  Convert to mins east of GMT.
                   */
                  off = -timeptr->tm_tzadj / 60;
#else /* !HAVE_TM_NAME */
#ifdef HAVE_TM_ZONE
                  /*
                   * Systems with tm_zone probably have tm_gmtoff as
                   * secs east of GMT.  Convert to mins east of GMT.
                   */
                  off = timeptr->tm_gmtoff / 60;
#else /* !HAVE_TM_ZONE */
#if HAVE_TZNAME
                  /*
                   * Systems with tzname[] probably have timezone as
                   * secs west of GMT.  Convert to mins east of GMT.
                   */
                  off = -(daylight ? timezone : altzone) / 60;
#else /* !HAVE_TZNAME */
                  off = -zone.tz_minuteswest;
#endif /* !HAVE_TZNAME */
#endif /* !HAVE_TM_ZONE */
#endif /* !HAVE_TM_NAME */
                  if (off < 0) {
                        tbuf[0] = '-';
                        off = -off;
                  } else {
                        tbuf[0] = '+';
                  }
                  sprintf(tbuf+1, "%02d%02d", off/60, off%60);
                  break;

            case 'Z':   /* time zone name or abbrevation */
#ifdef HAVE_TZNAME
                  i = (daylight && timeptr->tm_isdst > 0); /* 0 or 1 */
                  strcpy(tbuf, tzname[i]);
#else
#ifdef HAVE_TM_ZONE
                  strcpy(tbuf, timeptr->tm_zone);
#else
#ifdef HAVE_TM_NAME
                  strcpy(tbuf, timeptr->tm_name);
#else
                  gettimeofday(& tv, & zone);
                  strcpy(tbuf, timezone(zone.tz_minuteswest,
                                    timeptr->tm_isdst > 0));
#endif /* HAVE_TM_NAME */
#endif /* HAVE_TM_ZONE */
#endif /* HAVE_TZNAME */
                  break;

#ifdef SUNOS_EXT
            case 'k':   /* hour, 24-hour clock, blank pad */
                  sprintf(tbuf, "%2d", range(0, timeptr->tm_hour, 23));
                  break;

            case 'l':   /* hour, 12-hour clock, 1 - 12, blank pad */
                  i = range(0, timeptr->tm_hour, 23);
                  if (i == 0)
                        i = 12;
                  else if (i > 12)
                        i -= 12;
                  sprintf(tbuf, "%2d", i);
                  break;
#endif

#ifdef HPUX_EXT
            case 'N':   /* Emperor/Era name */
                  /* this is essentially the same as the century */
                  goto century;     /* %C */

            case 'o':   /* Emperor/Era year */
                  goto year;  /* %y */
#endif /* HPUX_EXT */


#ifdef VMS_EXT
            case 'v':   /* date as dd-bbb-YYYY */
                  sprintf(tbuf, "%2d-%3.3s-%4d",
                        range(1, timeptr->tm_mday, 31),
                        months_a[range(0, timeptr->tm_mon, 11)],
                        timeptr->tm_year + 1900);
                  for (i = 3; i < 6; i++)
                        if (islower(tbuf[i]))
                              tbuf[i] = toupper(tbuf[i]);
                  break;
#endif

            default:
                  tbuf[0] = '%';
                  tbuf[1] = *format;
                  tbuf[2] = '\0';
                  break;
            }
            i = strlen(tbuf);
            if (i) {
                  if (s + i < endp - 1) {
                        strcpy(s, tbuf);
                        s += i;
                  } else
                        return 0;
            }
      }
out:
      if (s < endp && *format == '\0') {
            *s = '\0';
            return (s - start);
      } else
            return 0;
}

/* isleap --- is a year a leap year? */

static int
isleap(int year)
{
      return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
}


/* iso8601wknum --- compute week number according to ISO 8601 */

static int
iso8601wknum(const struct tm *timeptr)
{
      /*
       * From 1003.2:
       *    If the week (Monday to Sunday) containing January 1
       *    has four or more days in the new year, then it is week 1;
       *    otherwise it is the highest numbered week of the previous
       *    year (52 or 53), and the next week is week 1.
       *
       * ADR: This means if Jan 1 was Monday through Thursday,
       *    it was week 1, otherwise week 52 or 53.
       *
       * XPG4 erroneously included POSIX.2 rationale text in the
       * main body of the standard. Thus it requires week 53.
       */

      int weeknum, jan1day, diff;

      /* get week number, Monday as first day of the week */
      weeknum = weeknumber(timeptr, 1);

      /*
       * With thanks and tip of the hatlo to tml@tik.vtt.fi
       *
       * What day of the week does January 1 fall on?
       * We know that
       *    (timeptr->tm_yday - jan1.tm_yday) MOD 7 ==
       *          (timeptr->tm_wday - jan1.tm_wday) MOD 7
       * and that
       *    jan1.tm_yday == 0
       * and that
       *    timeptr->tm_wday MOD 7 == timeptr->tm_wday
       * from which it follows that. . .
       */
      jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7);
      if (jan1day < 0)
            jan1day += 7;

      /*
       * If Jan 1 was a Monday through Thursday, it was in
       * week 1.  Otherwise it was last year's highest week, which is
       * this year's week 0.
       *
       * What does that mean?
       * If Jan 1 was Monday, the week number is exactly right, it can
       *    never be 0.
       * If it was Tuesday through Thursday, the weeknumber is one
       *    less than it should be, so we add one.
       * Otherwise, Friday, Saturday or Sunday, the week number is
       * OK, but if it is 0, it needs to be 52 or 53.
       */
      switch (jan1day) {
      case 1:           /* Monday */
            break;
      case 2:           /* Tuesday */
      case 3:           /* Wednesday */
      case 4:           /* Thursday */
            weeknum++;
            break;
      case 5:           /* Friday */
      case 6:           /* Saturday */
      case 0:           /* Sunday */
            if (weeknum == 0) {
#ifdef USE_BROKEN_XPG4
                  /* XPG4 (as of March 1994) says 53 unconditionally */
                  weeknum = 53;
#else
                  /* get week number of last week of last year */
                  struct tm dec31ly;      /* 12/31 last year */
                  dec31ly = *timeptr;
                  dec31ly.tm_year--;
                  dec31ly.tm_mon = 11;
                  dec31ly.tm_mday = 31;
                  dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1;
                  dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900);
                  weeknum = iso8601wknum(& dec31ly);
#endif
            }
            break;
      }

      if (timeptr->tm_mon == 11) {
            /*
             * The last week of the year
             * can be in week 1 of next year.
             * Sigh.
             *
             * This can only happen if
             *    M   T  W
             *    29  30 31
             *    30  31
             *    31
             */
            int wday, mday;

            wday = timeptr->tm_wday;
            mday = timeptr->tm_mday;
            if (   (wday == 1 && (mday >= 29 && mday <= 31))
                || (wday == 2 && (mday == 30 || mday == 31))
                || (wday == 3 &&  mday == 31))
                  weeknum = 1;
      }

      return weeknum;
}

/* weeknumber --- figure how many weeks into the year */

/* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */

static int
weeknumber(const struct tm *timeptr, int firstweekday)
{
      int wday = timeptr->tm_wday;
      int ret;

      if (firstweekday == 1) {
            if (wday == 0)    /* sunday */
                  wday = 6;
            else
                  wday--;
      }
      ret = ((timeptr->tm_yday + 7 - wday) / 7);
      if (ret < 0)
            ret = 0;
      return ret;
}

#if 0
/* ADR --- I'm loathe to mess with ado's code ... */

Date:         Wed, 24 Apr 91 20:54:08 MDT
From: Michal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK>
To: arnold@audiofax.com

Hi Arnold,
in a process of fixing of strftime() in libraries on Atari ST I grabbed
some pieces of code from your own strftime.  When doing that it came
to mind that your weeknumber() function compiles a little bit nicer
in the following form:
/*
 * firstweekday is 0 if starting in Sunday, non-zero if in Monday
 */
{
    return (timeptr->tm_yday - timeptr->tm_wday +
          (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7;
}
How nicer it depends on a compiler, of course, but always a tiny bit.

   Cheers,
   Michal
   ntomczak@vm.ucs.ualberta.ca
#endif

#ifdef      TEST_STRFTIME

/*
 * NAME:
 *    tst
 *
 * SYNOPSIS:
 *    tst
 *
 * DESCRIPTION:
 *    "tst" is a test driver for the function "strftime".
 *
 * OPTIONS:
 *    None.
 *
 * AUTHOR:
 *    Karl Vogel
 *    Control Data Systems, Inc.
 *    vogelke@c-17igp.wpafb.af.mil
 *
 * BUGS:
 *    None noticed yet.
 *
 * COMPILE:
 *    cc -o tst -DTEST_STRFTIME strftime.c
 */

/* ADR: I reformatted this to my liking, and deleted some unneeded code. */

#ifndef NULL
#include    <stdio.h>
#endif
#include    <sys/time.h>
#include    <string.h>

#define           MAXTIME           132

/*
 * Array of time formats.
 */

static char *array[] =
{
      "(%%A)      full weekday name, var length (Sunday..Saturday)  %A",
      "(%%B)       full month name, var length (January..December)  %B",
      "(%%C)                                               Century  %C",
      "(%%D)                                       date (%%m/%%d/%%y)  %D",
      "(%%E)                           Locale extensions (ignored)  %E",
      "(%%F)       full month name, var length (January..December)  %F",
      "(%%H)                          hour (24-hour clock, 00..23)  %H",
      "(%%I)                          hour (12-hour clock, 01..12)  %I",
      "(%%M)                                       minute (00..59)  %M",
      "(%%N)                                      Emporer/Era Name  %N",
      "(%%O)                           Locale extensions (ignored)  %O",
      "(%%R)                                 time, 24-hour (%%H:%%M)  %R",
      "(%%S)                                       second (00..60)  %S",
      "(%%T)                              time, 24-hour (%%H:%%M:%%S)  %T",
      "(%%U)    week of year, Sunday as first day of week (00..53)  %U",
      "(%%V)                    week of year according to ISO 8601  %V",
      "(%%W)    week of year, Monday as first day of week (00..53)  %W",
      "(%%X)     appropriate locale time representation (%H:%M:%S)  %X",
      "(%%Y)                           year with century (1970...)  %Y",
      "(%%Z) timezone (EDT), or blank if timezone not determinable  %Z",
      "(%%a)          locale's abbreviated weekday name (Sun..Sat)  %a",
      "(%%b)            locale's abbreviated month name (Jan..Dec)  %b",
      "(%%c)           full date (Sat Nov  4 12:02:33 1989)%n%t%t%t  %c",
      "(%%d)                             day of the month (01..31)  %d",
      "(%%e)               day of the month, blank-padded ( 1..31)  %e",
      "(%%h)                                should be same as (%%b)  %h",
      "(%%j)                            day of the year (001..366)  %j",
      "(%%k)               hour, 24-hour clock, blank pad ( 0..23)  %k",
      "(%%l)               hour, 12-hour clock, blank pad ( 0..12)  %l",
      "(%%m)                                        month (01..12)  %m",
      "(%%o)                                      Emporer/Era Year  %o",
      "(%%p)              locale's AM or PM based on 12-hour clock  %p",
      "(%%r)                   time, 12-hour (same as %%I:%%M:%%S %%p)  %r",
      "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7]   %u",
      "(%%v)                                VMS date (dd-bbb-YYYY)  %v",
      "(%%w)                       day of week (0..6, Sunday == 0)  %w",
      "(%%x)                appropriate locale date representation  %x",
      "(%%y)                      last two digits of year (00..99)  %y",
      "(%%z)      timezone offset east of GMT as HHMM (e.g. -0500)  %z",
      (char *) NULL
};

/* main routine. */

int
main(argc, argv)
int argc;
char **argv;
{
      long time();

      char *next;
      char string[MAXTIME];

      int k;
      int length;

      struct tm *tm;

      long clock;

      /* Call the function. */

      clock = time((long *) 0);
      tm = localtime(&clock);

      for (k = 0; next = array[k]; k++) {
            length = strftime(string, MAXTIME, next, tm);
            printf("%s\n", string);
      }

      exit(0);
}
#endif      /* TEST_STRFTIME */

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