c1a6a72560
This also brings our copy of strftime.c much closer to upstream, though
we still have several GNU extensions and hacks to deal with Android32's
broken time_t.
Bug: 15765976
(cherry picked from commit 39d903aea9)
Change-Id: Ie278d3e976b7adc77bad5ce795dd4899cfbf3648
728 lines
24 KiB
C
728 lines
24 KiB
C
/*
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** Based on the UCB version with the copyright notice and sccsid
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** appearing below.
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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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#include "private.h"
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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 "tzfile.h"
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#include "fcntl.h"
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#include "locale.h"
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#if __ANDROID__
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/* LP32 had a 32-bit time_t, so we need to work around that here. */
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#if defined(__LP64__)
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#define time64_t time_t
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#define mktime64 mktime
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#else
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#include <time64.h>
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#endif
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#include <ctype.h>
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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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#ifdef LOCALE_HOME
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#include "sys/stat.h"
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static struct lc_time_T localebuf;
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static struct lc_time_T * _loc(void);
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#define Locale _loc()
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#endif /* defined LOCALE_HOME */
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#ifndef LOCALE_HOME
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#define Locale (&C_time_locale)
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#endif /* !defined LOCALE_HOME */
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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 requires 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 requires 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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static char * _add(const char *, char *, const char *, int);
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static char * _conv(int, const char *, char *, const char *);
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static char * _fmt(const char *, const struct tm *, char *, const char *,
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int *);
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static char * _yconv(int, int, int, int, char *, const char *, int);
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static char * getformat(int, char *, char *, char *, char *);
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extern char * tzname[];
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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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#define IN_NONE 0
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#define IN_SOME 1
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#define IN_THIS 2
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#define IN_ALL 3
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#define FORCE_LOWER_CASE 0x100
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size_t
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strftime(char * const s, const size_t maxsize, 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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int warn;
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tzset();
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#ifdef LOCALE_HOME
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localebuf.mon[0] = 0;
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#endif /* defined LOCALE_HOME */
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warn = IN_NONE;
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p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn);
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#ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
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if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) {
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(void) fprintf(stderr, "\n");
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if (format == NULL)
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(void) fprintf(stderr, "NULL strftime format ");
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else (void) fprintf(stderr, "strftime format \"%s\" ",
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format);
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(void) fprintf(stderr, "yields only two digits of years in ");
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if (warn == IN_SOME)
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(void) fprintf(stderr, "some locales");
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else if (warn == IN_THIS)
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(void) fprintf(stderr, "the current locale");
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else (void) fprintf(stderr, "all locales");
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(void) fprintf(stderr, "\n");
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}
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#endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */
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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 *getformat(int modifier, char *normal, char *underscore,
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char *dash, char *zero) {
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switch (modifier) {
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case '_':
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return underscore;
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case '-':
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return dash;
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case '0':
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return zero;
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}
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return normal;
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}
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static char *
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_fmt(const char *format, const struct tm *const t, char * pt,
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const char *const ptlim, int *warnp)
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{
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for ( ; *format; ++format) {
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if (*format == '%') {
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int modifier = 0;
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label:
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switch (*++format) {
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case '\0':
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--format;
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break;
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case 'A':
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pt = _add((t->tm_wday < 0 ||
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t->tm_wday >= DAYSPERWEEK) ?
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"?" : Locale->weekday[t->tm_wday],
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pt, ptlim, modifier);
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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, modifier);
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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, modifier);
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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, modifier);
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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, 1, 0,
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pt, ptlim, modifier);
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continue;
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case 'c':
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{
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int 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,
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getformat(modifier, "%02d",
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"%2d", "%d", "%02d"),
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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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** C99 locale modifiers.
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** The sequences
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** %Ec %EC %Ex %EX %Ey %EY
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** %Od %oe %OH %OI %Om %OM
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** %OS %Ou %OU %OV %Ow %OW %Oy
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** are supposed to provide alternate
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** representations.
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*/
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goto label;
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case '_':
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case '-':
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case '0':
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case '^':
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case '#':
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modifier = *format;
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goto label;
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case 'e':
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pt = _conv(t->tm_mday,
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getformat(modifier, "%2d",
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"%2d", "%d", "%02d"),
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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,
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getformat(modifier, "%02d",
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"%2d", "%d", "%02d"),
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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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getformat(modifier, "%02d",
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"%2d", "%d", "%02d"),
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pt, ptlim);
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continue;
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case 'j':
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pt = _conv(t->tm_yday + 1,
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getformat(modifier, "%03d", "%3d", "%d", "%03d"),
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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,
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getformat(modifier, "%2d",
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"%2d", "%d", "%02d"),
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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 = _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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getformat(modifier, "%2d",
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"%2d", "%d", "%02d"),
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pt, ptlim);
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continue;
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case 'M':
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pt = _conv(t->tm_min,
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getformat(modifier, "%02d",
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"%2d", "%d", "%02d"),
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pt, ptlim);
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continue;
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case 'm':
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pt = _conv(t->tm_mon + 1,
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getformat(modifier, "%02d",
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"%2d", "%d", "%02d"),
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pt, ptlim);
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continue;
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case 'n':
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pt = _add("\n", pt, ptlim, modifier);
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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, modifier);
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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, FORCE_LOWER_CASE);
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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,
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getformat(modifier, "%02d",
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"%2d", "%d", "%02d"),
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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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time64_t) + 1];
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time64_t mkt;
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tm = *t;
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mkt = mktime64(&tm);
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if (TYPE_SIGNED(time64_t))
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(void) snprintf(buf, sizeof(buf), "%lld",
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(long long) mkt);
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else (void) snprintf(buf, sizeof(buf), "%llu",
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(unsigned long long) mkt);
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pt = _add(buf, pt, ptlim, modifier);
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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, modifier);
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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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getformat(modifier, "%02d",
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"%2d", "%d", "%02d"),
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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, "%d", pt, ptlim);
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continue;
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case 'V': /* ISO 8601 week number */
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case 'G': /* ISO 8601 year (four digits) */
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case 'g': /* ISO 8601 year (two digits) */
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/*
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** From Arnold Robbins' strftime version 3.0: "the week number of the
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** year (the first Monday as the first day of week 1) as a decimal number
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** (01-53)."
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** (ado, 1993-05-24)
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**
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** From <http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html> by Markus Kuhn:
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** "Week 01 of a year is per definition the first week which has the
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** Thursday in this year, which is equivalent to the week which contains
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** the fourth day of January. In other words, the first week of a new year
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** is the week which has the majority of its days in the new year. Week 01
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** might also contain days from the previous year and the week before week
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** 01 of a year is the last week (52 or 53) of the previous year even if
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** it contains days from the new year. A week starts with Monday (day 1)
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** and ends with Sunday (day 7). For example, the first week of the year
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** 1997 lasts from 1996-12-30 to 1997-01-05..."
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** (ado, 1996-01-02)
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*/
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{
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int year;
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int 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,
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getformat(modifier, "%02d", "%2d", "%d", "%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, 0, 1,
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pt, ptlim, modifier);
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} else pt = _yconv(year, base, 1, 1,
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pt, ptlim, modifier);
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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 ?
|
|
(t->tm_wday - 1) :
|
|
(DAYSPERWEEK - 1))) / DAYSPERWEEK,
|
|
getformat(modifier, "%02d",
|
|
"%2d", "%d", "%02d"),
|
|
pt, ptlim);
|
|
continue;
|
|
case 'w':
|
|
pt = _conv(t->tm_wday, "%d", pt, ptlim);
|
|
continue;
|
|
case 'X':
|
|
pt = _fmt(Locale->X_fmt, t, pt, ptlim, warnp);
|
|
continue;
|
|
case 'x':
|
|
{
|
|
int warn2 = IN_SOME;
|
|
|
|
pt = _fmt(Locale->x_fmt, t, pt, ptlim, &warn2);
|
|
if (warn2 == IN_ALL)
|
|
warn2 = IN_THIS;
|
|
if (warn2 > *warnp)
|
|
*warnp = warn2;
|
|
}
|
|
continue;
|
|
case 'y':
|
|
*warnp = IN_ALL;
|
|
pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1,
|
|
pt, ptlim, modifier);
|
|
continue;
|
|
case 'Y':
|
|
pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1,
|
|
pt, ptlim, modifier);
|
|
continue;
|
|
case 'Z':
|
|
#ifdef TM_ZONE
|
|
if (t->TM_ZONE != NULL)
|
|
pt = _add(t->TM_ZONE, pt, ptlim,
|
|
modifier);
|
|
else
|
|
#endif /* defined TM_ZONE */
|
|
if (t->tm_isdst >= 0)
|
|
pt = _add(tzname[t->tm_isdst != 0],
|
|
pt, ptlim, modifier);
|
|
/*
|
|
** C99 says that %Z must be replaced by the
|
|
** empty string if the time zone is not
|
|
** determinable.
|
|
*/
|
|
continue;
|
|
case 'z':
|
|
{
|
|
long diff;
|
|
char const * sign;
|
|
|
|
if (t->tm_isdst < 0)
|
|
continue;
|
|
#ifdef TM_GMTOFF
|
|
diff = t->TM_GMTOFF;
|
|
#else /* !defined TM_GMTOFF */
|
|
/*
|
|
** C99 says 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 C99;
|
|
** see GNU C strftime for details.
|
|
** For now, punt and conform to the
|
|
** standard, even though it's incorrect.
|
|
**
|
|
** C99 says 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)
|
|
#ifdef USG_COMPAT
|
|
diff = -timezone;
|
|
#else /* !defined USG_COMPAT */
|
|
continue;
|
|
#endif /* !defined USG_COMPAT */
|
|
else
|
|
#ifdef ALTZONE
|
|
diff = -altzone;
|
|
#else /* !defined ALTZONE */
|
|
continue;
|
|
#endif /* !defined ALTZONE */
|
|
#endif /* !defined TM_GMTOFF */
|
|
if (diff < 0) {
|
|
sign = "-";
|
|
diff = -diff;
|
|
} else sign = "+";
|
|
pt = _add(sign, pt, ptlim, modifier);
|
|
diff /= SECSPERMIN;
|
|
diff = (diff / MINSPERHOUR) * 100 +
|
|
(diff % MINSPERHOUR);
|
|
pt = _conv(diff,
|
|
getformat(modifier, "%04d",
|
|
"%4d", "%d", "%04d"),
|
|
pt, ptlim);
|
|
}
|
|
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;
|
|
}
|
|
|
|
static char *
|
|
_conv(const int n, const char *const format, char *const pt,
|
|
const char *const ptlim)
|
|
{
|
|
char buf[INT_STRLEN_MAXIMUM(int) + 1];
|
|
|
|
(void) snprintf(buf, sizeof(buf), format, n);
|
|
return _add(buf, pt, ptlim, 0);
|
|
}
|
|
|
|
static char *
|
|
_add(const char *str, char *pt, const char *const ptlim, int modifier)
|
|
{
|
|
int c;
|
|
|
|
switch (modifier) {
|
|
case FORCE_LOWER_CASE:
|
|
while (pt < ptlim && (*pt = tolower(*str++)) != '\0') {
|
|
++pt;
|
|
}
|
|
break;
|
|
|
|
case '^':
|
|
while (pt < ptlim && (*pt = toupper(*str++)) != '\0') {
|
|
++pt;
|
|
}
|
|
break;
|
|
|
|
case '#':
|
|
while (pt < ptlim && (c = *str++) != '\0') {
|
|
if (isupper(c)) {
|
|
c = tolower(c);
|
|
} else if (islower(c)) {
|
|
c = toupper(c);
|
|
}
|
|
*pt = c;
|
|
++pt;
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
while (pt < ptlim && (*pt = *str++) != '\0') {
|
|
++pt;
|
|
}
|
|
}
|
|
|
|
return pt;
|
|
}
|
|
|
|
/*
|
|
** POSIX and the C Standard are unclear or inconsistent about
|
|
** what %C and %y do if the year is negative or exceeds 9999.
|
|
** Use the convention that %C concatenated with %y yields the
|
|
** same output as %Y, and that %Y contains at least 4 bytes,
|
|
** with more only if necessary.
|
|
*/
|
|
|
|
static char *
|
|
_yconv(const int a, const int b, const int convert_top, const int convert_yy,
|
|
char *pt, const char *const ptlim, int modifier)
|
|
{
|
|
register int lead;
|
|
register int trail;
|
|
|
|
#define DIVISOR 100
|
|
trail = a % DIVISOR + b % DIVISOR;
|
|
lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
|
|
trail %= DIVISOR;
|
|
if (trail < 0 && lead > 0) {
|
|
trail += DIVISOR;
|
|
--lead;
|
|
} else if (lead < 0 && trail > 0) {
|
|
trail -= DIVISOR;
|
|
++lead;
|
|
}
|
|
if (convert_top) {
|
|
if (lead == 0 && trail < 0)
|
|
pt = _add("-0", pt, ptlim, modifier);
|
|
else pt = _conv(lead, getformat(modifier, "%02d", "%2d", "%d", "%02d"), pt, ptlim);
|
|
}
|
|
if (convert_yy)
|
|
pt = _conv(((trail < 0) ? -trail : trail), getformat(modifier, "%02d", "%2d", "%d", "%02d"), pt, ptlim);
|
|
return pt;
|
|
}
|