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620035ef89
strftime(3) for IEEE Std 1003.1-2001 compliance and remove excessive usage of the 'const' qualifier that was neither present in the prototype in the publice header, nor in the local prototype just above the function definition. - Replace the K&R function definition with a ANSI-C one. - Update the prototype of strftime(3) in its manual page.
448 lines
11 KiB
C
448 lines
11 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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#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 "namespace.h"
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#include "private.h"
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#if defined(LIBC_SCCS) && !defined(lint)
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static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 "un-namespace.h"
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#include "timelocal.h"
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static char * _add(const char *, char *, const char *);
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static char * _conv(int, const char *, char *, const char *);
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static char * _fmt(const char *, const struct tm *, char *, const char *);
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size_t strftime(char *__restrict, size_t, const char *__restrict,
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const struct tm *__restrict);
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extern char * tzname[];
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size_t
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strftime(char *__restrict s, size_t maxsize, const char *__restrict format,
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const struct tm *__restrict 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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int Ealternative, Oalternative;
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struct lc_time_T *tptr = __get_current_time_locale();
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for ( ; *format; ++format) {
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if (*format == '%') {
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Ealternative = 0;
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Oalternative = 0;
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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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"?" : tptr->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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"?" : tptr->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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"?" : (Oalternative ? tptr->alt_month :
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tptr->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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"?" : tptr->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(tptr->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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if (Ealternative || Oalternative)
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break;
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Ealternative++;
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goto label;
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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 %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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** FreeBSD extensions
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** %OB %Ef %EF
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*/
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if (Ealternative || Oalternative)
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break;
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Oalternative++;
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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 'F':
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pt = _fmt("%Y-%m-%d", t, 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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tptr->pm :
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tptr->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(tptr->ampm_fmt, 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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{
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struct tm tm;
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char buf[INT_STRLEN_MAXIMUM(
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time_t) + 1];
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time_t mkt;
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tm = *t;
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mkt = mktime(&tm);
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if (TYPE_SIGNED(time_t))
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(void) sprintf(buf, "%ld",
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(long) mkt);
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else (void) sprintf(buf, "%lu",
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(unsigned long) mkt);
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pt = _add(buf, pt, ptlim);
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}
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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(tptr->X_fmt, t, pt, ptlim);
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continue;
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case 'x':
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pt = _fmt(tptr->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 'z':
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{
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long absoff;
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if (t->tm_gmtoff >= 0) {
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absoff = t->tm_gmtoff;
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pt = _add("+", pt, ptlim);
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} else {
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absoff = -t->tm_gmtoff;
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pt = _add("-", pt, ptlim);
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}
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pt = _conv(absoff / 3600, "%02d",
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pt, ptlim);
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pt = _conv((absoff % 3600) / 60, "%02d",
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pt, ptlim);
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};
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continue;
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case '+':
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pt = _fmt(tptr->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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_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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