a9cac4c87a
Upstream tzcode said "On platforms with tm_zone, strftime.c now assumes it is not NULL". Which is fine for any struct tm generated by tzcode, but not necessarily true of a struct tm constructed by arbitrary code. In particular, Netflix on Nexus Player was failing to start because they format "%Z" with a struct tm whose tm_zone is null (the other fields are valid, but, yeah, that's probably not intentional). glibc takes a null tm_zone to mean "the current time zone", so let's do that too. (Historically Android would use the empty string, and POSIX doesn't clarify which of this is the appropriate behavior when tm_zone is null.) Bug: http://b/25170306 Change-Id: Idbf68bfe90d143aca7dada8607742905188b1d33
690 lines
23 KiB
C
690 lines
23 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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#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 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, bool, bool, 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 *s, size_t maxsize, const char *format, const struct tm *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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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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fprintf(stderr, "\n");
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if (format == NULL)
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fprintf(stderr, "NULL strftime format ");
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else fprintf(stderr, "strftime format \"%s\" ",
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format);
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fprintf(stderr, "yields only two digits of years in ");
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if (warn == IN_SOME)
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fprintf(stderr, "some locales");
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else if (warn == IN_THIS)
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fprintf(stderr, "the current locale");
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else fprintf(stderr, "all locales");
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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 *t, char *pt,
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const char *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,
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true, false, 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, getformat(modifier, "%02d", "%2d", "%d", "%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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** 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, getformat(modifier, "%2d", "%2d", "%d", "%02d"), 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, getformat(modifier, "%02d", "%2d", "%d", "%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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getformat(modifier, "%02d", "%2d", "%d", "%02d"), pt, ptlim);
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continue;
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case 'j':
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pt = _conv(t->tm_yday + 1, getformat(modifier, "%03d", "%3d", "%d", "%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, getformat(modifier, "%2d", "%2d", "%d", "%02d"), 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", "%2d", "%d", "%02d"), pt, ptlim);
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continue;
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case 'M':
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pt = _conv(t->tm_min, getformat(modifier, "%02d", "%2d", "%d", "%02d"), pt, ptlim);
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continue;
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case 'm':
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pt = _conv(t->tm_mon + 1, getformat(modifier, "%02d", "%2d", "%d", "%02d"), 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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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, (*format == 'P') ? FORCE_LOWER_CASE : modifier);
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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, getformat(modifier, "%02d", "%2d", "%d", "%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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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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snprintf(buf, sizeof(buf), "%"PRIdMAX,
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(intmax_t) mkt);
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else snprintf(buf, sizeof(buf), "%"PRIuMAX,
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(uintmax_t) 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", "%2d", "%d", "%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 <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, 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,
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false, true,
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pt, ptlim, modifier);
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} else pt = _yconv(year, base,
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true, true,
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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 ?
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(t->tm_wday - 1) :
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(DAYSPERWEEK - 1))) / DAYSPERWEEK,
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getformat(modifier, "%02d", "%2d", "%d", "%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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int 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, modifier);
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continue;
|
|
case 'Y':
|
|
pt = _yconv(t->tm_year, TM_YEAR_BASE,
|
|
true, true,
|
|
pt, ptlim, modifier);
|
|
continue;
|
|
case 'Z':
|
|
#ifdef TM_ZONE
|
|
// BEGIN: Android-changed.
|
|
{
|
|
const char* zone = t->TM_ZONE;
|
|
if (!zone || !*zone) {
|
|
// "The value of tm_isdst shall be positive if Daylight Savings Time is
|
|
// in effect, 0 if Daylight Savings Time is not in effect, and negative
|
|
// if the information is not available."
|
|
if (t->tm_isdst == 0) zone = tzname[0];
|
|
else if (t->tm_isdst > 0) zone = tzname[1];
|
|
|
|
// "Replaced by the timezone name or abbreviation, or by no bytes if no
|
|
// timezone information exists."
|
|
if (!zone || !*zone) zone = "";
|
|
}
|
|
pt = _add(zone, pt, ptlim, modifier);
|
|
}
|
|
// END: Android-changed.
|
|
#else
|
|
if (t->tm_isdst >= 0)
|
|
pt = _add(tzname[t->tm_isdst != 0],
|
|
pt, ptlim);
|
|
#endif
|
|
/*
|
|
** 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(int n, const char *format, char *pt, const char *ptlim)
|
|
{
|
|
char buf[INT_STRLEN_MAXIMUM(int) + 1];
|
|
|
|
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(int a, int b, bool convert_top, bool convert_yy,
|
|
char *pt, const char *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;
|
|
}
|