575 lines
13 KiB
C
575 lines
13 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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"$Id$";
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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 <locale.h>
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#include <sys/stat.h>
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#include "setlocale.h"
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struct lc_time_T {
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const char * mon[12];
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const char * month[12];
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const char * wday[7];
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const char * weekday[7];
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const char * X_fmt;
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const char * x_fmt;
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const char * c_fmt;
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const char * am;
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const char * pm;
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const char * date_fmt;
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};
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static struct lc_time_T localebuf;
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static int using_locale;
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#define Locale (using_locale ? &localebuf : &C_time_locale)
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static const struct lc_time_T C_time_locale = {
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{
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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}, {
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"January", "February", "March", "April", "May", "June",
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"July", "August", "September", "October", "November", "December"
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}, {
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"Sun", "Mon", "Tue", "Wed",
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"Thu", "Fri", "Sat"
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}, {
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"Sunday", "Monday", "Tuesday", "Wednesday",
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"Thursday", "Friday", "Saturday"
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},
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/* X_fmt */
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"%H:%M:%S",
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/*
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** x_fmt
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** Since the C language standard calls for
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** "date, using locale's date format," anything goes.
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** Using just numbers (as here) makes Quakers happier;
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** it's also compatible with SVR4.
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*/
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"%m/%d/%y",
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/*
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** c_fmt (ctime-compatible)
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** Note that
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** "%a %b %d %H:%M:%S %Y"
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** is used by Solaris 2.3.
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*/
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"%a %b %e %X %Y",
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/* am */
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"AM",
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/* pm */
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"PM",
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/* date_fmt */
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"%a %b %e %X %Z %Y"
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};
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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':
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/*
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** From Arnold Robbins' strftime version 3.0:
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** "the week number of the year (the first
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** Monday as the first day of week 1) as a
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** decimal number (01-53). The method for
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** determining the week number is as specified
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** by ISO 8601 (to wit: if the week containing
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** January 1 has four or more days in the new
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** year, then it is week 1, otherwise it is
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** week 53 of the previous year and the next
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** week is week 1)."
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** (ado, 5/24/93)
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*/
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/*
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** XXX--If January 1 falls on a Friday,
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** January 1-3 are part of week 53 of the
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** previous year. By analogy, if January
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** 1 falls on a Thursday, are December 29-31
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** of the PREVIOUS year part of week 1???
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** (ado 5/24/93)
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*/
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/*
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** You are understood not to expect this.
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*/
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{
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int i;
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i = (t->tm_yday + 10 - (t->tm_wday ?
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(t->tm_wday - 1) : 6)) / 7;
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if (i == 0) {
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/*
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** What day of the week does
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** January 1 fall on?
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*/
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i = t->tm_wday -
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(t->tm_yday - 1);
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/*
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** Fri Jan 1: 53
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** Sun Jan 1: 52
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** Sat Jan 1: 53 if previous
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** year a leap
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** year, else 52
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*/
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if (i == TM_FRIDAY)
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i = 53;
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else if (i == TM_SUNDAY)
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i = 52;
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else i = isleap(t->tm_year +
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TM_YEAR_BASE) ?
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53 : 52;
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#ifdef XPG4_1994_04_09
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/*
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** As of 4/9/94, though,
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** XPG4 calls for 53
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** unconditionally.
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*/
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i = 53;
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#endif /* defined XPG4_1994_04_09 */
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}
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pt = _conv(i, "%02d", 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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int
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__time_load_locale(const char *name)
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{
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static char * locale_buf;
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static char locale_buf_C[] = "C";
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int fd;
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char * lbuf;
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char * p;
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const char ** ap;
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const char * plim;
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char filename[PATH_MAX];
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struct stat st;
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size_t namesize;
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size_t bufsize;
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int save_using_locale;
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save_using_locale = using_locale;
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using_locale = 0;
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if (name == NULL)
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goto no_locale;
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if (!strcmp(name, "C") || !strcmp(name, "POSIX"))
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return 0;
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/*
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** If the locale name is the same as our cache, use the cache.
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*/
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lbuf = locale_buf;
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if (lbuf != NULL && strcmp(name, lbuf) == 0) {
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p = lbuf;
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for (ap = (const char **) &localebuf;
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ap < (const char **) (&localebuf + 1);
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++ap)
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*ap = p += strlen(p) + 1;
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using_locale = 1;
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return 0;
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}
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/*
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** Slurp the locale file into the cache.
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*/
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namesize = strlen(name) + 1;
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if (!_PathLocale)
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goto no_locale;
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/* Range checking not needed, 'name' size is limited */
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strcpy(filename, _PathLocale);
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strcat(filename, "/");
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strcat(filename, name);
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strcat(filename, "/LC_TIME");
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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goto no_locale;
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if (fstat(fd, &st) != 0)
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goto bad_locale;
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if (st.st_size <= 0)
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goto bad_locale;
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bufsize = namesize + st.st_size;
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locale_buf = NULL;
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lbuf = (lbuf == NULL || lbuf == locale_buf_C) ?
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malloc(bufsize) : realloc(lbuf, bufsize);
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if (lbuf == NULL)
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goto bad_locale;
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(void) strcpy(lbuf, name);
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p = lbuf + namesize;
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plim = p + st.st_size;
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if (read(fd, p, (size_t) st.st_size) != st.st_size)
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goto bad_lbuf;
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if (close(fd) != 0)
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goto bad_lbuf;
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/*
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** Parse the locale file into localebuf.
|
|
*/
|
|
if (plim[-1] != '\n')
|
|
goto bad_lbuf;
|
|
for (ap = (const char **) &localebuf;
|
|
ap < (const char **) (&localebuf + 1);
|
|
++ap) {
|
|
if (p == plim)
|
|
goto reset_locale;
|
|
*ap = p;
|
|
while (*p != '\n')
|
|
++p;
|
|
*p++ = '\0';
|
|
}
|
|
/*
|
|
** Record the successful parse in the cache.
|
|
*/
|
|
locale_buf = lbuf;
|
|
|
|
using_locale = 1;
|
|
return 0;
|
|
|
|
reset_locale:
|
|
/*
|
|
* XXX - This may not be the correct thing to do in this case.
|
|
* setlocale() assumes that we left the old locale alone.
|
|
*/
|
|
locale_buf = locale_buf_C;
|
|
localebuf = C_time_locale;
|
|
save_using_locale = 0;
|
|
bad_lbuf:
|
|
free(lbuf);
|
|
bad_locale:
|
|
(void) close(fd);
|
|
no_locale:
|
|
using_locale = save_using_locale;
|
|
return -1;
|
|
}
|