mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-17 02:52:40 +00:00
68c7c9c1e0
- Use good ELF technique in cosmo_dlopen() - Make strerror() conform more to other libc impls - Introduce __clear_cache() and use it in cosmo_dlopen() - Remove libc/fmt/fmt.h header (trying to kill off LIBC_FMT)
602 lines
16 KiB
C
602 lines
16 KiB
C
/*-*- mode:c; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=c ts=8 tw=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/inttypes.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/locale.h"
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#include "libc/time/time.h"
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#include "libc/time/tz.internal.h"
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// clang-format off
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// converts broken-down timestamp to string
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#define DIVISOR 100
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asm(".ident\t\"\\n\\n\
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strftime (BSD-3)\\n\
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Copyright 1989 The Regents of the University of California\"");
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asm(".include \"libc/disclaimer.inc\"");
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/*
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** Based on the UCB version with the copyright notice appearing above.
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**
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** This is ANSIish only when "multibyte character == plain character".
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*/
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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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#define Locale (&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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** 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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strftime_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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strftime_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 strftime_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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strftime_yconv(
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int a,
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int b,
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bool convert_top,
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bool convert_yy,
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char *pt,
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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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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 = strftime_add("-0", pt, ptlim);
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else pt = strftime_conv(lead, "%02d", pt, ptlim);
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}
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if (convert_yy)
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pt = strftime_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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strftime_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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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 = strftime_add(
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(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 = strftime_add(
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(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 = strftime_add(
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(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 = strftime_add(
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(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 = strftime_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 = strftime_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 = strftime_fmt("%m/%d/%y", t, pt, ptlim, warnp);
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continue;
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case 'd':
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pt = strftime_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 = strftime_conv(t->tm_mday, "%2d", pt, ptlim);
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continue;
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case 'F':
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pt = strftime_fmt("%Y-%m-%d", t, pt, ptlim, warnp);
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continue;
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case 'H':
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pt = strftime_conv(t->tm_hour, "%02d", pt, ptlim);
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continue;
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case 'I':
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pt = strftime_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 = strftime_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 = strftime_conv(t->tm_hour, "%2d",
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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 = strftime_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 = strftime_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 = strftime_conv(t->tm_min, "%02d",
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pt, ptlim);
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continue;
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case 'm':
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pt = strftime_conv(t->tm_mon + 1, "%02d",
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pt, ptlim);
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continue;
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case 'n':
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pt = strftime_add("\n", pt, ptlim);
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continue;
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case 'p':
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pt = strftime_add(
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(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 = strftime_fmt("%H:%M", t, pt, ptlim, warnp);
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continue;
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case 'r':
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pt = strftime_fmt("%I:%M:%S %p", t, pt,
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ptlim, warnp);
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continue;
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case 'S':
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pt = strftime_conv(t->tm_sec, "%02d", pt,
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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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tm.tm_yday = -1;
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mkt = mktime(&tm);
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if (mkt == (time_t) -1) {
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/* Fail unless this -1 represents
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a valid time. */
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struct tm tm_1;
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if (!localtime_r(&mkt, &tm_1))
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return NULL;
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if (!(tm.tm_year == tm_1.tm_year
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&& tm.tm_yday == tm_1.tm_yday
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&& tm.tm_hour == tm_1.tm_hour
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&& tm.tm_min == tm_1.tm_min
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&& tm.tm_sec == tm_1.tm_sec))
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return NULL;
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}
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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 = strftime_add(buf, pt, ptlim);
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}
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continue;
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case 'T':
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pt = strftime_fmt("%H:%M:%S", t, pt, ptlim, warnp);
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continue;
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case 't':
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pt = strftime_add("\t", pt, ptlim);
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continue;
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case 'U':
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pt = strftime_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 = strftime_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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if (*format == 'V')
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pt = strftime_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 = strftime_yconv(year, base,
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false, true,
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pt, ptlim);
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} else pt = strftime_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 = strftime_fmt("%e-%b-%Y", t, pt, ptlim, warnp);
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continue;
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case 'W':
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pt = strftime_conv(
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(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 = strftime_conv(t->tm_wday, "%d", pt, ptlim);
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continue;
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case 'X':
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pt = strftime_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 = strftime_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 = strftime_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 = strftime_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':
|
|
pt = strftime_add(t->tm_zone, pt, ptlim);
|
|
/*
|
|
** C99 and later say that %Z must be
|
|
** replaced by the empty string if the
|
|
** time zone abbreviation is not
|
|
** determinable.
|
|
*/
|
|
continue;
|
|
case 'z':
|
|
{
|
|
long diff;
|
|
char const * sign;
|
|
bool negative;
|
|
|
|
diff = t->tm_gmtoff;
|
|
negative = diff < 0;
|
|
if (diff == 0) {
|
|
negative = t->tm_zone[0] == '-';
|
|
}
|
|
if (negative) {
|
|
sign = "-";
|
|
diff = -diff;
|
|
} else sign = "+";
|
|
pt = strftime_add(sign, pt, ptlim);
|
|
diff /= SECSPERMIN;
|
|
diff = (diff / MINSPERHOUR) * 100 +
|
|
(diff % MINSPERHOUR);
|
|
pt = strftime_conv(diff, "%04d", pt, ptlim);
|
|
}
|
|
continue;
|
|
case '+':
|
|
pt = strftime_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 *s, size_t maxsize, const char *format, const struct tm *t)
|
|
{
|
|
char * p;
|
|
int saved_errno = errno;
|
|
enum warn warn = IN_NONE;
|
|
|
|
tzset();
|
|
p = strftime_fmt(format, t, s, s + maxsize, &warn);
|
|
if (!p) {
|
|
errno = EOVERFLOW;
|
|
return 0;
|
|
}
|
|
if (p == s + maxsize) {
|
|
errno = ERANGE;
|
|
return 0;
|
|
}
|
|
*p = '\0';
|
|
errno = saved_errno;
|
|
return p - s;
|
|
}
|
|
|
|
size_t
|
|
strftime_l(char *s, size_t maxsize, char const *format, struct tm const *t,
|
|
locale_t locale)
|
|
{
|
|
/* Just call strftime, as only the C locale is supported. */
|
|
return strftime(s, maxsize, format, t);
|
|
}
|