b9b51fb731
Added the conversion specifiers %g and %G, that are replaced by the year which contains the greater part of the week in question.
422 lines
10 KiB
C
422 lines
10 KiB
C
/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifdef LIBC_RCS
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static const char rcsid[] =
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"$Id: strftime.c,v 1.18 1997/08/09 15:43:53 joerg Exp $";
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#endif
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#ifndef lint
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#ifndef NOID
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static const char elsieid[] = "@(#)strftime.c 7.38";
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/*
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** Based on the UCB version with the ID appearing below.
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** This is ANSIish only when "multibyte character == plain character".
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*/
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#endif /* !defined NOID */
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#endif /* !defined lint */
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#include "private.h"
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#ifndef LIBC_SCCS
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#ifndef lint
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static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89";
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#endif /* !defined lint */
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#endif /* !defined LIBC_SCCS */
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#include "tzfile.h"
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#include <fcntl.h>
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#include <sys/stat.h>
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#include "timelocal.h"
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static char * _add P((const char *, char *, const char *));
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static char * _conv P((int, const char *, char *, const char *));
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static char * _fmt P((const char *, const struct tm *, char *, const char *));
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static char * _secs P((const struct tm *, char *, const char *));
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size_t strftime P((char *, size_t, const char *, const struct tm *));
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extern char * tzname[];
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size_t
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strftime(s, maxsize, format, t)
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char *const s;
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const size_t maxsize;
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const char *const format;
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const struct tm *const t;
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{
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char *p;
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tzset();
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p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize);
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if (p == s + maxsize)
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return 0;
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*p = '\0';
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return p - s;
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}
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static char *
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_fmt(format, t, pt, ptlim)
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const char *format;
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const struct tm *const t;
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char *pt;
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const char *const ptlim;
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{
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for ( ; *format; ++format) {
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if (*format == '%') {
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label:
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switch (*++format) {
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case '\0':
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--format;
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break;
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case 'A':
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pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ?
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"?" : Locale->weekday[t->tm_wday],
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pt, ptlim);
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continue;
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case 'a':
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pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ?
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"?" : Locale->wday[t->tm_wday],
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pt, ptlim);
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continue;
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case 'B':
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pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ?
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"?" : Locale->month[t->tm_mon],
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pt, ptlim);
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continue;
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case 'b':
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case 'h':
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pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ?
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"?" : Locale->mon[t->tm_mon],
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pt, ptlim);
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continue;
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case 'C':
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/*
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** %C used to do a...
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** _fmt("%a %b %e %X %Y", t);
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** ...whereas now POSIX 1003.2 calls for
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** something completely different.
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** (ado, 5/24/93)
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*/
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pt = _conv((t->tm_year + TM_YEAR_BASE) / 100,
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"%02d", pt, ptlim);
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continue;
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case 'c':
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pt = _fmt(Locale->c_fmt, t, pt, ptlim);
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continue;
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case 'D':
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pt = _fmt("%m/%d/%y", t, pt, ptlim);
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continue;
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case 'd':
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pt = _conv(t->tm_mday, "%02d", pt, ptlim);
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continue;
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case 'E':
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case 'O':
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/*
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** POSIX locale extensions, a la
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** Arnold Robbins' strftime version 3.0.
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** The sequences
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** %Ec %EC %Ex %Ey %EY
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** %Od %oe %OH %OI %Om %OM
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** %OS %Ou %OU %OV %Ow %OW %Oy
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** are supposed to provide alternate
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** representations.
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** (ado, 5/24/93)
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*/
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goto label;
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case 'e':
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pt = _conv(t->tm_mday, "%2d", pt, ptlim);
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continue;
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case 'H':
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pt = _conv(t->tm_hour, "%02d", pt, ptlim);
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continue;
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case 'I':
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pt = _conv((t->tm_hour % 12) ?
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(t->tm_hour % 12) : 12,
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"%02d", pt, ptlim);
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continue;
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case 'j':
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pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim);
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continue;
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case 'k':
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/*
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** This used to be...
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** _conv(t->tm_hour % 12 ?
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** t->tm_hour % 12 : 12, 2, ' ');
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** ...and has been changed to the below to
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** match SunOS 4.1.1 and Arnold Robbins'
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** strftime version 3.0. That is, "%k" and
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** "%l" have been swapped.
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** (ado, 5/24/93)
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*/
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pt = _conv(t->tm_hour, "%2d", pt, ptlim);
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continue;
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#ifdef KITCHEN_SINK
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case 'K':
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/*
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** After all this time, still unclaimed!
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*/
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pt = _add("kitchen sink", pt, ptlim);
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continue;
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#endif /* defined KITCHEN_SINK */
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case 'l':
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/*
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** This used to be...
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** _conv(t->tm_hour, 2, ' ');
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** ...and has been changed to the below to
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** match SunOS 4.1.1 and Arnold Robbin's
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** strftime version 3.0. That is, "%k" and
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** "%l" have been swapped.
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** (ado, 5/24/93)
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*/
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pt = _conv((t->tm_hour % 12) ?
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(t->tm_hour % 12) : 12,
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"%2d", pt, ptlim);
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continue;
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case 'M':
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pt = _conv(t->tm_min, "%02d", pt, ptlim);
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continue;
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case 'm':
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pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim);
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continue;
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case 'n':
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pt = _add("\n", pt, ptlim);
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continue;
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case 'p':
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pt = _add((t->tm_hour >= 12) ?
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Locale->pm :
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Locale->am,
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pt, ptlim);
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continue;
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case 'R':
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pt = _fmt("%H:%M", t, pt, ptlim);
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continue;
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case 'r':
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pt = _fmt("%I:%M:%S %p", t, pt, ptlim);
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continue;
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case 'S':
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pt = _conv(t->tm_sec, "%02d", pt, ptlim);
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continue;
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case 's':
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pt = _secs(t, pt, ptlim);
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continue;
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case 'T':
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pt = _fmt("%H:%M:%S", t, pt, ptlim);
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continue;
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case 't':
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pt = _add("\t", pt, ptlim);
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continue;
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case 'U':
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pt = _conv((t->tm_yday + 7 - t->tm_wday) / 7,
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"%02d", pt, ptlim);
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continue;
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case 'u':
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/*
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** From Arnold Robbins' strftime version 3.0:
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** "ISO 8601: Weekday as a decimal number
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** [1 (Monday) - 7]"
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** (ado, 5/24/93)
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*/
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pt = _conv((t->tm_wday == 0) ? 7 : t->tm_wday,
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"%d", pt, ptlim);
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continue;
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case 'V': /* ISO 8601 week number */
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case 'G': /* ISO 8601 year (four digits) */
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case 'g': /* ISO 8601 year (two digits) */
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/*
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** From Arnold Robbins' strftime version 3.0: "the week number of the
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** year (the first Monday as the first day of week 1) as a decimal number
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** (01-53)."
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** (ado, 1993-05-24)
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**
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** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn:
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** "Week 01 of a year is per definition the first week which has the
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** Thursday in this year, which is equivalent to the week which contains
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** the fourth day of January. In other words, the first week of a new year
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** is the week which has the majority of its days in the new year. Week 01
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** might also contain days from the previous year and the week before week
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** 01 of a year is the last week (52 or 53) of the previous year even if
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** it contains days from the new year. A week starts with Monday (day 1)
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** and ends with Sunday (day 7). For example, the first week of the year
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** 1997 lasts from 1996-12-30 to 1997-01-05..."
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** (ado, 1996-01-02)
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*/
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{
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int year;
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int yday;
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int wday;
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int w;
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year = t->tm_year + TM_YEAR_BASE;
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yday = t->tm_yday;
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wday = t->tm_wday;
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for ( ; ; ) {
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int len;
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int bot;
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int top;
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len = isleap(year) ?
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DAYSPERLYEAR :
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DAYSPERNYEAR;
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/*
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** What yday (-3 ... 3) does
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** the ISO year begin on?
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*/
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bot = ((yday + 11 - wday) %
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DAYSPERWEEK) - 3;
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/*
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** What yday does the NEXT
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** ISO year begin on?
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*/
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top = bot -
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(len % DAYSPERWEEK);
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if (top < -3)
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top += DAYSPERWEEK;
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top += len;
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if (yday >= top) {
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++year;
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w = 1;
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break;
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}
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if (yday >= bot) {
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w = 1 + ((yday - bot) /
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DAYSPERWEEK);
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break;
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}
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--year;
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yday += isleap(year) ?
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DAYSPERLYEAR :
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DAYSPERNYEAR;
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}
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#ifdef XPG4_1994_04_09
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if ((w == 52
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&& t->tm_mon == TM_JANUARY)
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|| (w == 1
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&& t->tm_mon == TM_DECEMBER))
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w = 53;
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#endif /* defined XPG4_1994_04_09 */
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if (*format == 'V')
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pt = _conv(w, "%02d",
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pt, ptlim);
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else if (*format == 'g') {
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pt = _conv(year % 100, "%02d",
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pt, ptlim);
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} else pt = _conv(year, "%04d",
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pt, ptlim);
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}
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continue;
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case 'v':
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/*
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** From Arnold Robbins' strftime version 3.0:
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** "date as dd-bbb-YYYY"
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** (ado, 5/24/93)
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*/
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pt = _fmt("%e-%b-%Y", t, pt, ptlim);
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continue;
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case 'W':
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pt = _conv((t->tm_yday + 7 -
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(t->tm_wday ?
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(t->tm_wday - 1) : 6)) / 7,
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"%02d", pt, ptlim);
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continue;
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case 'w':
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pt = _conv(t->tm_wday, "%d", pt, ptlim);
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continue;
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case 'X':
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pt = _fmt(Locale->X_fmt, t, pt, ptlim);
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continue;
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case 'x':
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pt = _fmt(Locale->x_fmt, t, pt, ptlim);
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continue;
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case 'y':
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pt = _conv((t->tm_year + TM_YEAR_BASE) % 100,
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"%02d", pt, ptlim);
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continue;
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case 'Y':
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pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d",
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pt, ptlim);
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continue;
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case 'Z':
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if (t->tm_zone != NULL)
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pt = _add(t->tm_zone, pt, ptlim);
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else
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if (t->tm_isdst == 0 || t->tm_isdst == 1) {
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pt = _add(tzname[t->tm_isdst],
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pt, ptlim);
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} else pt = _add("?", pt, ptlim);
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continue;
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case '+':
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pt = _fmt(Locale->date_fmt, t, pt, ptlim);
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continue;
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case '%':
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/*
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* X311J/88-090 (4.12.3.5): if conversion char is
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* undefined, behavior is undefined. Print out the
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* character itself as printf(3) also does.
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*/
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default:
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break;
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}
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}
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if (pt == ptlim)
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break;
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*pt++ = *format;
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}
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return pt;
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}
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static char *
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_conv(n, format, pt, ptlim)
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const int n;
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const char *const format;
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char *const pt;
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const char *const ptlim;
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{
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char buf[INT_STRLEN_MAXIMUM(int) + 1];
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(void) sprintf(buf, format, n);
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return _add(buf, pt, ptlim);
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}
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static char *
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_secs(t, pt, ptlim)
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const struct tm *t;
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char *pt;
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const char *ptlim;
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{
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char buf[INT_STRLEN_MAXIMUM(int) + 1];
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register time_t s;
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struct tm tmp;
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/* Make a copy, mktime(3) modifies the tm struct. */
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tmp = *t;
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s = mktime(&tmp);
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(void) sprintf(buf, "%ld", s);
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return _add(buf, pt, ptlim);
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}
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static char *
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_add(str, pt, ptlim)
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const char *str;
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char *pt;
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const char *const ptlim;
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{
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while (pt < ptlim && (*pt = *str++) != '\0')
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++pt;
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return pt;
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}
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