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strftime.c

/*
 * Copyright (c) 1989, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strftime.c    8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/time.h>
#include <tzfile.h>
#include <limits.h>
#include <stdio.h>

/*
** 302 / 1000 is log10(2.0) rounded up.
** Subtract one for the sign bit;
** add one for integer division truncation;
** add one more for a minus sign.
*/
#define INT_STRLEN_MAXIMUM(type) \
      ((sizeof(type) * CHAR_BIT - 1) * 302 / 1000 + 2)

/*
** Based on elsieid[] = "@(#)strftime.c   7.15"
**
** This is ANSIish only when time is treated identically in all locales and
** when "multibyte character == plain character".
*/

static const char afmt[][4] = {
      "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static const char Afmt[][10] = {
      "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday",
      "Saturday"
};
static const char bfmt[][4] = {
      "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
      "Oct", "Nov", "Dec"
};
static const char Bfmt[][10] = {
      "January", "February", "March", "April", "May", "June", "July",
      "August", "September", "October", "November", "December"
};

static char *_add __P((const char *, char *, const char *));
static char *_conv __P((int, const char *, char *, const char *));
static char *_secs __P((const struct tm *, char *, const char *));
static char *_fmt __P((const char *, const struct tm *, char *, const char *));

extern char *tzname[];

size_t
strftime(s, maxsize, format, t)
      char *s;
      size_t maxsize;
      const char *format;
      const struct tm *t;
{
      char *p;

      p = _fmt(format, t, s, s + maxsize);
      if (p == s + maxsize)
            return (0);
      *p = '\0';
      return (p - s);
}

static char *
_fmt(format, t, pt, ptlim)
      const char *format;
      const struct tm *t;
      char *pt;
      const char *ptlim;
{
      for (; *format; ++format) {
            if (*format == '%') {
label:
                  switch(*++format) {
                  case '\0':
                        --format;
                        break;
                  case 'A':
                        pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ?
                              "?" : Afmt[t->tm_wday], pt, ptlim);
                        continue;
                  case 'a':
                        pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ?
                              "?" : afmt[t->tm_wday], pt, ptlim);
                        continue;
                  case 'B':
                        pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ?
                              "?" : Bfmt[t->tm_mon], pt, ptlim);
                        continue;
                  case 'b':
                  case 'h':
                        pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ?
                              "?" : bfmt[t->tm_mon], pt, ptlim);
                        continue;
                  case 'c':
                        pt = _fmt("%D %X", t, pt, ptlim);
                        continue;
                  case 'C':
                        /*
                        ** %C used to do a...
                        **    _fmt("%a %b %e %X %Y", t);
                        ** ...whereas now POSIX 1003.2 calls for
                        ** something completely different.
                        ** (ado, 5/24/93)
                        */
                        pt = _conv((t->tm_year + TM_YEAR_BASE) / 100,
                              "%02d", pt, ptlim);
                        continue;
                  case 'D':
                        pt = _fmt("%m/%d/%y", t, pt, ptlim);
                        continue;
                  case 'x':
                        /*
                        ** Version 3.0 of strftime from Arnold Robbins
                        ** (arnold@skeeve.atl.ga.us) does the
                        ** equivalent of...
                        **    _fmt("%a %b %e %Y");
                        ** ...for %x; since the X3J11 C language
                        ** standard calls for "date, using locale's
                        ** date format," anything goes.  Using just
                        ** numbers (as here) makes Quakers happier.
                        ** Word from Paul Eggert (eggert@twinsun.com)
                        ** is that %Y-%m-%d is the ISO standard date
                        ** format, specified in ISO 2014 and later
                        ** ISO 8601:1988, with a summary available in
                        ** pub/doc/ISO/english/ISO8601.ps.Z on
                        ** ftp.uni-erlangen.de.
                        ** (ado, 5/30/93)
                        */
                        pt = _fmt("%m/%d/%y", t, pt, ptlim);
                        continue;
                  case 'd':
                        pt = _conv(t->tm_mday, "%02d", pt, ptlim);
                        continue;
                  case 'E':
                  case 'O':
                        /*
                        ** POSIX locale extensions, a la
                        ** Arnold Robbins' strftime version 3.0.
                        ** The sequences
                        **    %Ec %EC %Ex %Ey %EY
                        **    %Od %oe %OH %OI %Om %OM
                        **    %OS %Ou %OU %OV %Ow %OW %Oy
                        ** are supposed to provide alternate
                        ** representations.
                        ** (ado, 5/24/93)
                        */
                        goto label;
                  case 'e':
                        pt = _conv(t->tm_mday, "%2d", pt, ptlim);
                        continue;
                  case 'H':
                        pt = _conv(t->tm_hour, "%02d", pt, ptlim);
                        continue;
                  case 'I':
                        pt = _conv((t->tm_hour % 12) ?
                              (t->tm_hour % 12) : 12,
                              "%02d", pt, ptlim);
                        continue;
                  case 'j':
                        pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim);
                        continue;
                  case 'k':
                        /*
                        ** This used to be...
                        **    _conv(t->tm_hour % 12 ?
                        **          t->tm_hour % 12 : 12, 2, ' ');
                        ** ...and has been changed to the below to
                        ** match SunOS 4.1.1 and Arnold Robbins'
                        ** strftime version 3.0.  That is, "%k" and
                        ** "%l" have been swapped.
                        ** (ado, 5/24/93)
                        */
                        pt = _conv(t->tm_hour, "%2d", pt, ptlim);
                        continue;
#ifdef KITCHEN_SINK
                  case 'K':
                        /*
                        ** After all this time, still unclaimed!
                        */
                        pt = _add("kitchen sink", pt, ptlim);
                        continue;
#endif /* defined KITCHEN_SINK */
                  case 'l':
                        /*
                        ** This used to be...
                        **    _conv(t->tm_hour, 2, ' ');
                        ** ...and has been changed to the below to
                        ** match SunOS 4.1.1 and Arnold Robbin's
                        ** strftime version 3.0.  That is, "%k" and
                        ** "%l" have been swapped.
                        ** (ado, 5/24/93)
                        */
                        pt = _conv((t->tm_hour % 12) ?
                              (t->tm_hour % 12) : 12,
                              "%2d", pt, ptlim);
                        continue;
                  case 'M':
                        pt = _conv(t->tm_min, "%02d", pt, ptlim);
                        continue;
                  case 'm':
                        pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim);
                        continue;
                  case 'n':
                        pt = _add("\n", pt, ptlim);
                        continue;
                  case 'p':
                        pt = _add(t->tm_hour >= 12 ? "PM" : "AM",
                              pt, ptlim);
                        continue;
                  case 'R':
                        pt = _fmt("%H:%M", t, pt, ptlim);
                        continue;
                  case 'r':
                        pt = _fmt("%I:%M:%S %p", t, pt, ptlim);
                        continue;
                  case 'S':
                        pt = _conv(t->tm_sec, "%02d", pt, ptlim);
                        continue;
                  case 's':
                        pt = _secs(t, pt, ptlim);
                        continue;
                  case 'T':
                  case 'X':
                        pt = _fmt("%H:%M:%S", t, pt, ptlim);
                        continue;
                  case 't':
                        pt = _add("\t", pt, ptlim);
                        continue;
                  case 'U':
                        pt = _conv((t->tm_yday + 7 - t->tm_wday) / 7,
                              "%02d", pt, ptlim);
                        continue;
                  case 'u':
                        /*
                        ** From Arnold Robbins' strftime version 3.0:
                        ** "ISO 8601: Weekday as a decimal number
                        ** [1 (Monday) - 7]"
                        ** (ado, 5/24/93)
                        */
                        pt = _conv((t->tm_wday == 0) ? 7 : t->tm_wday,
                              "%d", pt, ptlim);
                        continue;
                  case 'V':
                        /*
                        ** From Arnold Robbins' strftime version 3.0:
                        ** "the week number of the year (the first
                        ** Monday as the first day of week 1) as a
                        ** decimal number (01-53).  The method for
                        ** determining the week number is as specified
                        ** by ISO 8601 (to wit: if the week containing
                        ** January 1 has four or more days in the new
                        ** year, then it is week 1, otherwise it is
                        ** week 53 of the previous year and the next
                        ** week is week 1)."
                        ** (ado, 5/24/93)
                        */
                        /*
                        ** XXX--If January 1 falls on a Friday,
                        ** January 1-3 are part of week 53 of the
                        ** previous year.  By analogy, if January
                        ** 1 falls on a Thursday, are December 29-31
                        ** of the PREVIOUS year part of week 1???
                        ** (ado 5/24/93)
                        **
                        ** You are understood not to expect this.
                        */
                        {
                              int i;

                              i = (t->tm_yday + 10 - (t->tm_wday ?
                                    (t->tm_wday - 1) : 6)) / 7;
                              pt = _conv((i == 0) ? 53 : i,
                                    "%02d", pt, ptlim);
                        }
                        continue;
#ifdef notdef
                        /* Not in POSIX date(1), System V or ANSI C. */
                  case 'v':
                        /*
                        ** From Arnold Robbins' strftime version 3.0:
                        ** "date as dd-bbb-YYYY"
                        ** (ado, 5/24/93)
                        */
                        pt = _fmt("%e-%b-%Y", t, pt, ptlim);
                        continue;
#endif
                  case 'W':
                        pt = _conv((t->tm_yday + 7 -
                              (t->tm_wday ?
                              (t->tm_wday - 1) : 6)) / 7,
                              "%02d", pt, ptlim);
                        continue;
                  case 'w':
                        pt = _conv(t->tm_wday, "%d", pt, ptlim);
                        continue;
                  case 'y':
                        pt = _conv((t->tm_year + TM_YEAR_BASE) % 100,
                              "%02d", pt, ptlim);
                        continue;
                  case 'Y':
                        pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d",
                              pt, ptlim);
                        continue;
                  case 'Z':
#ifdef TM_ZONE
                        if (t->TM_ZONE)
                              pt = _add(t->TM_ZONE, pt, ptlim);
                        else
#endif /* defined TM_ZONE */
                        if (t->tm_isdst == 0 || t->tm_isdst == 1) {
                              pt = _add(tzname[t->tm_isdst],
                                    pt, ptlim);
                        } else  pt = _add("?", pt, ptlim);
                        continue;
                  case '%':
                  /*
                   * X311J/88-090 (4.12.3.5): if conversion char is
                   * undefined, behavior is undefined.  Print out the
                   * character itself as printf(3) does.
                   */
                  default:
                        break;
                  }
            }
            if (pt == ptlim)
                  break;
            *pt++ = *format;
      }
      return (pt);
}

static char *
_secs(t, pt, ptlim)
      const struct tm *t;
      char *pt;
      const char *ptlim;
{
      struct tm tmp;
      time_t s;

      tmp = *t;
      s = mktime(&tmp);
      return (_conv((int)s, "%d", pt, ptlim));
}

static char *
_conv(n, format, pt, ptlim)
      int n;
      const char *format;
      char *pt;
      const char *ptlim;
{
      char buf[INT_STRLEN_MAXIMUM(int) + 1];

      (void) sprintf(buf, format, n);
      return (_add(buf, pt, ptlim));
}

static char *
_add(str, pt, ptlim)
      const char *str;
      char *pt;
      const char *ptlim;
{

      while (pt < ptlim && (*pt = *str++) != '\0')
            ++pt;
      return (pt);
}

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