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712 lines
24 KiB
712 lines
24 KiB
/* Convert a broken-down time stamp to a string. */ |
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/* Copyright 1989 The Regents of the University of California. |
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All rights reserved. |
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions |
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are met: |
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1. Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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2. Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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3. Neither the name of the University nor the names of its contributors |
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may be used to endorse or promote products derived from this software |
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without specific prior written permission. |
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND |
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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SUCH DAMAGE. */ |
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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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#include "private.h" |
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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 defined(__BIONIC__) |
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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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#if !HAVE_POSIX_DECLS |
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extern char * tzname[]; |
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#endif |
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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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#if HAVE_STRFTIME_L |
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size_t |
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strftime_l(char *s, size_t maxsize, char const *format, struct tm const *t, |
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locale_t locale) |
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{ |
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/* Just call strftime, as only the C locale is supported. */ |
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return strftime(s, maxsize, format, t); |
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} |
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#endif |
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#define FORCE_LOWER_CASE 0x100 /* Android extension. */ |
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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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|
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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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|
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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; |
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case 'Y': |
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pt = _yconv(t->tm_year, TM_YEAR_BASE, |
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true, true, |
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pt, ptlim, modifier); |
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continue; |
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case 'Z': |
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#ifdef TM_ZONE |
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// BEGIN: Android-changed. |
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{ |
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const char* zone = t->TM_ZONE; |
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if (!zone || !*zone) { |
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// "The value of tm_isdst shall be positive if Daylight Savings Time is |
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// in effect, 0 if Daylight Savings Time is not in effect, and negative |
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// if the information is not available." |
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if (t->tm_isdst == 0) zone = tzname[0]; |
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else if (t->tm_isdst > 0) zone = tzname[1]; |
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|
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// "Replaced by the timezone name or abbreviation, or by no bytes if no |
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// timezone information exists." |
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if (!zone || !*zone) zone = ""; |
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} |
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pt = _add(zone, pt, ptlim, modifier); |
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} |
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// END: Android-changed. |
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#else |
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if (t->tm_isdst >= 0) |
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pt = _add(tzname[t->tm_isdst != 0], |
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pt, ptlim); |
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#endif |
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/* |
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** C99 says that %Z must be replaced by the |
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** empty string if the time zone is not |
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** determinable. |
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*/ |
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continue; |
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case 'z': |
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{ |
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long diff; |
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char const * sign; |
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|
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if (t->tm_isdst < 0) |
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continue; |
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#ifdef TM_GMTOFF |
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diff = t->TM_GMTOFF; |
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#else /* !defined TM_GMTOFF */ |
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/* |
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** C99 says that the UT offset must |
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** be computed by looking only at |
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** tm_isdst. This requirement is |
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** incorrect, since it means the code |
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** must rely on magic (in this case |
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** altzone and timezone), and the |
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** magic might not have the correct |
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** offset. Doing things correctly is |
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** 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; |
|
}
|
|
|