mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
b0df6c1fce
Cosmopolitan now supports 104 time zones. They're embedded inside any binary that links the localtime() function. Doing so adds about 100kb to the binary size. This change also gets time zones working properly on Windows for the first time. It's not needed to have /etc/localtime exist on Windows, since we can get this information from WIN32. We're also now updated to the latest version of Paul Eggert's TZ library.
646 lines
16 KiB
C
646 lines
16 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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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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#include "libc/str/locale.h"
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#include "libc/time.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/inttypes.h"
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#include "private.h"
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__notice(strftime_notice, "strftime (BSD-3)\n\
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Copyright 1989 The Regents of the University of California");
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#ifndef DEPRECATE_TWO_DIGIT_YEARS
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# define DEPRECATE_TWO_DIGIT_YEARS false
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#endif
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struct lc_time_T {
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const char * mon[MONSPERYEAR];
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const char * month[MONSPERYEAR];
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const char * wday[DAYSPERWEEK];
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const char * weekday[DAYSPERWEEK];
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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 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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** C99 and later require this format.
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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
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** C99 and later require this format.
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** Previously this code used "%D %X", but we now conform to C99.
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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 %T %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 %H:%M:%S %Z %Y"
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};
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enum warn { IN_NONE, IN_SOME, IN_THIS, IN_ALL };
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#ifndef YEAR_2000_NAME
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# define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS"
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#endif /* !defined YEAR_2000_NAME */
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static char *
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_add(const char *str, char *pt, const char *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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static char *
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_conv(int n, const char *format, char *pt, const char *ptlim)
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{
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char buf[INT_STRLEN_MAXIMUM(int) + 1];
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sprintf(buf, format, n);
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return _add(buf, pt, ptlim);
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}
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/*
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** POSIX and the C Standard are unclear or inconsistent about
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** what %C and %y do if the year is negative or exceeds 9999.
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** Use the convention that %C concatenated with %y yields the
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** same output as %Y, and that %Y contains at least 4 bytes,
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** with more only if necessary.
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*/
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static char *
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_yconv(int a, int b, bool convert_top, bool convert_yy,
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char *pt, const char *ptlim)
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{
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register int lead;
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register int trail;
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int DIVISOR = 100;
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trail = a % DIVISOR + b % DIVISOR;
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lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
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trail %= DIVISOR;
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if (trail < 0 && lead > 0) {
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trail += DIVISOR;
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--lead;
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} else if (lead < 0 && trail > 0) {
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trail -= DIVISOR;
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++lead;
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}
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if (convert_top) {
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if (lead == 0 && trail < 0)
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pt = _add("-0", pt, ptlim);
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else pt = _conv(lead, "%02d", pt, ptlim);
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}
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if (convert_yy)
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pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim);
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return pt;
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}
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static char *
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_fmt(const char *format, const struct tm *t, char *pt,
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const char *ptlim, enum warn *warnp)
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{
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struct lc_time_T const *Locale = &C_time_locale;
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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 ||
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t->tm_wday >= DAYSPERWEEK) ?
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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 ||
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t->tm_wday >= DAYSPERWEEK) ?
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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 ||
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t->tm_mon >= MONSPERYEAR) ?
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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 ||
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t->tm_mon >= MONSPERYEAR) ?
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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, 1993-05-24)
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*/
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pt = _yconv(t->tm_year, TM_YEAR_BASE,
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true, false, pt, ptlim);
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continue;
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case 'c':
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{
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enum warn warn2 = IN_SOME;
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pt = _fmt(Locale->c_fmt, t, pt, ptlim, &warn2);
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if (warn2 == IN_ALL)
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warn2 = IN_THIS;
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if (warn2 > *warnp)
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*warnp = warn2;
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}
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continue;
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case 'D':
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pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp);
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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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** Locale modifiers of C99 and later.
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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 alternative
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** representations.
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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 'F':
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pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp);
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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, 1993-05-24)
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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, 1993-05-24)
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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 >= (HOURSPERDAY / 2)) ?
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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, warnp);
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continue;
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case 'r':
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pt = _fmt("%I:%M:%S %p", t, pt, ptlim, warnp);
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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.tm_sec = t->tm_sec;
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tm.tm_min = t->tm_min;
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tm.tm_hour = t->tm_hour;
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tm.tm_mday = t->tm_mday;
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tm.tm_mon = t->tm_mon;
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tm.tm_year = t->tm_year;
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#ifdef TM_GMTOFF
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mkt = timeoff(&tm, t->TM_GMTOFF);
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#else
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tm.tm_isdst = t->tm_isdst;
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mkt = mktime(&tm);
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#endif
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/* If mktime fails, %s expands to the
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value of (time_t) -1 as a failure
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marker; this is better in practice
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than strftime failing. */
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if (TYPE_SIGNED(time_t)) {
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intmax_t n = mkt;
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sprintf(buf, "%"PRIdMAX, n);
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} else {
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uintmax_t n = mkt;
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sprintf(buf, "%"PRIuMAX, n);
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}
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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, warnp);
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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 + DAYSPERWEEK -
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t->tm_wday) / DAYSPERWEEK,
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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, 1993-05-24)
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*/
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pt = _conv((t->tm_wday == 0) ?
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DAYSPERWEEK : 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 <https://www.cl.cam.ac.uk/~mgk25/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 base;
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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;
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base = 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_sum(year, base) ?
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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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++base;
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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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--base;
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yday += isleap_sum(year, base) ?
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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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*warnp = IN_ALL;
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pt = _yconv(year, base,
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false, true,
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pt, ptlim);
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} else pt = _yconv(year, base,
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true, true,
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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, 1993-05-24)
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*/
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pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp);
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continue;
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case 'W':
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pt = _conv((t->tm_yday + DAYSPERWEEK -
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(t->tm_wday ?
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(t->tm_wday - 1) :
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(DAYSPERWEEK - 1))) / DAYSPERWEEK,
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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, warnp);
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continue;
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case 'x':
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{
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enum warn warn2 = IN_SOME;
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pt = _fmt(Locale->x_fmt, t, pt, ptlim, &warn2);
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if (warn2 == IN_ALL)
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warn2 = IN_THIS;
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if (warn2 > *warnp)
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*warnp = warn2;
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}
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continue;
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case 'y':
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*warnp = IN_ALL;
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pt = _yconv(t->tm_year, TM_YEAR_BASE,
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false, true,
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pt, ptlim);
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continue;
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case 'Y':
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pt = _yconv(t->tm_year, TM_YEAR_BASE,
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true, true,
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pt, ptlim);
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continue;
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case 'Z':
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#ifdef TM_ZONE
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pt = _add(t->TM_ZONE, pt, ptlim);
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#elif HAVE_TZNAME
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if (t->tm_isdst >= 0)
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pt = _add(tzname[t->tm_isdst != 0],
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pt, ptlim);
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#endif
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/*
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|
** C99 and later say that %Z must be
|
|
** replaced by the empty string if the
|
|
** time zone abbreviation is not
|
|
** determinable.
|
|
*/
|
|
continue;
|
|
case 'z':
|
|
#if defined TM_GMTOFF || USG_COMPAT || ALTZONE
|
|
{
|
|
long diff;
|
|
char const * sign;
|
|
bool negative;
|
|
|
|
# ifdef TM_GMTOFF
|
|
diff = t->TM_GMTOFF;
|
|
# else
|
|
/*
|
|
** C99 and later say that the UT offset must
|
|
** be computed by looking only at
|
|
** tm_isdst. This requirement is
|
|
** incorrect, since it means the code
|
|
** must rely on magic (in this case
|
|
** altzone and timezone), and the
|
|
** magic might not have the correct
|
|
** offset. Doing things correctly is
|
|
** tricky and requires disobeying the standard;
|
|
** see GNU C strftime for details.
|
|
** For now, punt and conform to the
|
|
** standard, even though it's incorrect.
|
|
**
|
|
** C99 and later say that %z must be replaced by
|
|
** the empty string if the time zone is not
|
|
** determinable, so output nothing if the
|
|
** appropriate variables are not available.
|
|
*/
|
|
if (t->tm_isdst < 0)
|
|
continue;
|
|
if (t->tm_isdst == 0)
|
|
# if USG_COMPAT
|
|
diff = -timezone;
|
|
# else
|
|
continue;
|
|
# endif
|
|
else
|
|
# if ALTZONE
|
|
diff = -altzone;
|
|
# else
|
|
continue;
|
|
# endif
|
|
# endif
|
|
negative = diff < 0;
|
|
if (diff == 0) {
|
|
# ifdef TM_ZONE
|
|
negative = t->TM_ZONE[0] == '-';
|
|
# else
|
|
negative = t->tm_isdst < 0;
|
|
# if HAVE_TZNAME
|
|
if (tzname[t->tm_isdst != 0][0] == '-')
|
|
negative = true;
|
|
# endif
|
|
# endif
|
|
}
|
|
if (negative) {
|
|
sign = "-";
|
|
diff = -diff;
|
|
} else sign = "+";
|
|
pt = _add(sign, pt, ptlim);
|
|
diff /= SECSPERMIN;
|
|
diff = (diff / MINSPERHOUR) * 100 +
|
|
(diff % MINSPERHOUR);
|
|
pt = _conv(diff, "%04d", pt, ptlim);
|
|
}
|
|
#endif
|
|
continue;
|
|
case '+':
|
|
pt = _fmt(Locale->date_fmt, t, pt, ptlim,
|
|
warnp);
|
|
continue;
|
|
case '%':
|
|
/*
|
|
** X311J/88-090 (4.12.3.5): if conversion char is
|
|
** undefined, behavior is undefined. Print out the
|
|
** character itself as printf(3) also does.
|
|
*/
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
if (pt == ptlim)
|
|
break;
|
|
*pt++ = *format;
|
|
}
|
|
return pt;
|
|
}
|
|
|
|
/**
|
|
* Converts time to string, e.g.
|
|
*
|
|
* char b[64];
|
|
* int64_t sec;
|
|
* struct tm tm;
|
|
* time(&sec);
|
|
* localtime_r(&sec, &tm);
|
|
* strftime(b, sizeof(b), "%Y-%m-%dT%H:%M:%S%z", &tm); // ISO8601
|
|
* strftime(b, sizeof(b), "%a, %d %b %Y %H:%M:%S %Z", &tm); // RFC1123
|
|
*
|
|
* @return bytes copied excluding nul, or 0 on error
|
|
* @see FormatHttpDateTime()
|
|
*/
|
|
size_t
|
|
strftime(char *restrict s, size_t maxsize, char const *restrict format,
|
|
struct tm const *restrict t)
|
|
{
|
|
char * p;
|
|
int saved_errno = errno;
|
|
enum warn warn = IN_NONE;
|
|
|
|
tzset();
|
|
p = _fmt(format, t, s, s + maxsize, &warn);
|
|
if (!p) {
|
|
errno = EOVERFLOW;
|
|
return 0;
|
|
}
|
|
if (DEPRECATE_TWO_DIGIT_YEARS
|
|
&& warn != IN_NONE && getenv(YEAR_2000_NAME)) {
|
|
fprintf(stderr, "\n");
|
|
fprintf(stderr, "strftime format \"%s\" ", format);
|
|
fprintf(stderr, "yields only two digits of years in ");
|
|
if (warn == IN_SOME)
|
|
fprintf(stderr, "some locales");
|
|
else if (warn == IN_THIS)
|
|
fprintf(stderr, "the current locale");
|
|
else fprintf(stderr, "all locales");
|
|
fprintf(stderr, "\n");
|
|
}
|
|
if (p == s + maxsize) {
|
|
errno = ERANGE;
|
|
return 0;
|
|
}
|
|
*p = '\0';
|
|
errno = saved_errno;
|
|
return p - s;
|
|
}
|
|
|
|
__weak_reference(strftime, strftime_l);
|