strftime.c
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上传日期:2015-12-11
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- /*
- * strftime.c --
- *
- * This file contains a modified version of the BSD 4.4 strftime
- * function.
- *
- * This file is a modified version of the strftime.c file from the BSD 4.4
- * source. See the copyright notice below for details on redistribution
- * restrictions. The "license.terms" file does not apply to this file.
- *
- * Changes 2002 Copyright (c) 2002 ActiveState Corporation.
- *
- * RCS: @(#) $Id: strftime.c,v 1.10.2.3 2005/11/04 18:18:04 kennykb Exp $
- */
- /*
- * Copyright (c) 1989 The Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #if defined(LIBC_SCCS)
- static char *rcsid = "$Id: strftime.c,v 1.10.2.3 2005/11/04 18:18:04 kennykb Exp $";
- #endif /* LIBC_SCCS */
- #include <time.h>
- #include <string.h>
- #include <locale.h>
- #include "tclInt.h"
- #include "tclPort.h"
- #define TM_YEAR_BASE 1900
- #define IsLeapYear(x) ((x % 4 == 0) && (x % 100 != 0 || x % 400 == 0))
- typedef struct {
- const char *abday[7];
- const char *day[7];
- const char *abmon[12];
- const char *mon[12];
- const char *am_pm[2];
- const char *d_t_fmt;
- const char *d_fmt;
- const char *t_fmt;
- const char *t_fmt_ampm;
- } _TimeLocale;
- /*
- * This is the C locale default. On Windows, if we wanted to make this
- * localized, we would use GetLocaleInfo to get the correct values.
- * It may be acceptable to do localization of month/day names, as the
- * numerical values would be considered the locale-independent versions.
- */
- static const _TimeLocale _DefaultTimeLocale =
- {
- {
- "Sun","Mon","Tue","Wed","Thu","Fri","Sat",
- },
- {
- "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
- "Friday", "Saturday"
- },
- {
- "Jan", "Feb", "Mar", "Apr", "May", "Jun",
- "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
- },
- {
- "January", "February", "March", "April", "May", "June", "July",
- "August", "September", "October", "November", "December"
- },
- {
- "AM", "PM"
- },
- "%a %b %d %H:%M:%S %Y",
- "%m/%d/%y",
- "%H:%M:%S",
- "%I:%M:%S %p"
- };
- static const _TimeLocale *_CurrentTimeLocale = &_DefaultTimeLocale;
- static int isGMT;
- static size_t gsize;
- static char *pt;
- static int _add _ANSI_ARGS_((const char* str));
- static int _conv _ANSI_ARGS_((int n, int digits, int pad));
- static int _secs _ANSI_ARGS_((const struct tm *t));
- static size_t _fmt _ANSI_ARGS_((const char *format,
- const struct tm *t));
- static int ISO8601Week _ANSI_ARGS_((CONST struct tm* t, int *year ));
- size_t
- TclpStrftime(s, maxsize, format, t, useGMT)
- char *s;
- size_t maxsize;
- const char *format;
- const struct tm *t;
- int useGMT;
- {
- if (format[0] == '%' && format[1] == 'Q') {
- /* Format as a stardate */
- sprintf(s, "Stardate %2d%03d.%01d",
- (((t->tm_year + TM_YEAR_BASE) + 377) - 2323),
- (((t->tm_yday + 1) * 1000) /
- (365 + IsLeapYear((t->tm_year + TM_YEAR_BASE)))),
- (((t->tm_hour * 60) + t->tm_min)/144));
- return(strlen(s));
- }
- isGMT = useGMT;
- /*
- * We may be able to skip this for useGMT, but it should be harmless.
- * -- hobbs
- */
- tzset();
- pt = s;
- if ((gsize = maxsize) < 1)
- return(0);
- if (_fmt(format, t)) {
- *pt = ' ';
- return(maxsize - gsize);
- }
- return(0);
- }
- #define SUN_WEEK(t) (((t)->tm_yday + 7 -
- ((t)->tm_wday)) / 7)
- #define MON_WEEK(t) (((t)->tm_yday + 7 -
- ((t)->tm_wday ? (t)->tm_wday - 1 : 6)) / 7)
- static size_t
- _fmt(format, t)
- const char *format;
- const struct tm *t;
- {
- #ifdef WIN32
- #define BUF_SIZ 256
- TCHAR buf[BUF_SIZ];
- SYSTEMTIME syst = {
- t->tm_year + 1900,
- t->tm_mon + 1,
- t->tm_wday,
- t->tm_mday,
- t->tm_hour,
- t->tm_min,
- t->tm_sec,
- 0,
- };
- #endif
- for (; *format; ++format) {
- if (*format == '%') {
- ++format;
- if (*format == 'E') {
- /* Alternate Era */
- ++format;
- } else if (*format == 'O') {
- /* Alternate numeric symbols */
- ++format;
- }
- switch(*format) {
- case ' ':
- --format;
- break;
- case 'A':
- if (t->tm_wday < 0 || t->tm_wday > 6)
- return(0);
- if (!_add(_CurrentTimeLocale->day[t->tm_wday]))
- return(0);
- continue;
- case 'a':
- if (t->tm_wday < 0 || t->tm_wday > 6)
- return(0);
- if (!_add(_CurrentTimeLocale->abday[t->tm_wday]))
- return(0);
- continue;
- case 'B':
- if (t->tm_mon < 0 || t->tm_mon > 11)
- return(0);
- if (!_add(_CurrentTimeLocale->mon[t->tm_mon]))
- return(0);
- continue;
- case 'b':
- case 'h':
- if (t->tm_mon < 0 || t->tm_mon > 11)
- return(0);
- if (!_add(_CurrentTimeLocale->abmon[t->tm_mon]))
- return(0);
- continue;
- case 'C':
- if (!_conv((t->tm_year + TM_YEAR_BASE) / 100,
- 2, '0'))
- return(0);
- continue;
- case 'D':
- if (!_fmt("%m/%d/%y", t))
- return(0);
- continue;
- case 'd':
- if (!_conv(t->tm_mday, 2, '0'))
- return(0);
- continue;
- case 'e':
- if (!_conv(t->tm_mday, 2, ' '))
- return(0);
- continue;
- case 'g':
- {
- int year;
- ISO8601Week( t, &year );
- if ( !_conv( year%100, 2, '0' ) ) {
- return( 0 );
- }
- continue;
- }
- case 'G':
- {
- int year;
- ISO8601Week( t, &year );
- if ( !_conv( year, 4, '0' ) ) {
- return( 0 );
- }
- continue;
- }
- case 'H':
- if (!_conv(t->tm_hour, 2, '0'))
- return(0);
- continue;
- case 'I':
- if (!_conv(t->tm_hour % 12 ?
- t->tm_hour % 12 : 12, 2, '0'))
- return(0);
- continue;
- case 'j':
- if (!_conv(t->tm_yday + 1, 3, '0'))
- return(0);
- continue;
- case 'k':
- if (!_conv(t->tm_hour, 2, ' '))
- return(0);
- continue;
- case 'l':
- if (!_conv(t->tm_hour % 12 ?
- t->tm_hour % 12: 12, 2, ' '))
- return(0);
- continue;
- case 'M':
- if (!_conv(t->tm_min, 2, '0'))
- return(0);
- continue;
- case 'm':
- if (!_conv(t->tm_mon + 1, 2, '0'))
- return(0);
- continue;
- case 'n':
- if (!_add("n"))
- return(0);
- continue;
- case 'p':
- if (!_add(_CurrentTimeLocale->am_pm[t->tm_hour >= 12]))
- return(0);
- continue;
- case 'R':
- if (!_fmt("%H:%M", t))
- return(0);
- continue;
- case 'r':
- if (!_fmt(_CurrentTimeLocale->t_fmt_ampm, t))
- return(0);
- continue;
- case 'S':
- if (!_conv(t->tm_sec, 2, '0'))
- return(0);
- continue;
- case 's':
- if (!_secs(t))
- return(0);
- continue;
- case 'T':
- if (!_fmt("%H:%M:%S", t))
- return(0);
- continue;
- case 't':
- if (!_add("t"))
- return(0);
- continue;
- case 'U':
- if (!_conv(SUN_WEEK(t), 2, '0'))
- return(0);
- continue;
- case 'u':
- if (!_conv(t->tm_wday ? t->tm_wday : 7, 1, '0'))
- return(0);
- continue;
- case 'V':
- {
- int week = ISO8601Week( t, NULL );
- if (!_conv(week, 2, '0'))
- return(0);
- continue;
- }
- case 'W':
- if (!_conv(MON_WEEK(t), 2, '0'))
- return(0);
- continue;
- case 'w':
- if (!_conv(t->tm_wday, 1, '0'))
- return(0);
- continue;
- #ifdef WIN32
- /*
- * To properly handle the localized time routines on Windows,
- * we must make use of the special localized calls.
- */
- case 'c':
- if (!GetDateFormat(LOCALE_USER_DEFAULT,
- DATE_LONGDATE | LOCALE_USE_CP_ACP,
- &syst, NULL, buf, BUF_SIZ)
- || !_add(buf)
- || !_add(" ")) {
- return(0);
- }
- /*
- * %c is created with LONGDATE + " " + TIME on Windows,
- * so continue to %X case here.
- */
- case 'X':
- if (!GetTimeFormat(LOCALE_USER_DEFAULT,
- LOCALE_USE_CP_ACP,
- &syst, NULL, buf, BUF_SIZ)
- || !_add(buf)) {
- return(0);
- }
- continue;
- case 'x':
- if (!GetDateFormat(LOCALE_USER_DEFAULT,
- DATE_SHORTDATE | LOCALE_USE_CP_ACP,
- &syst, NULL, buf, BUF_SIZ)
- || !_add(buf)) {
- return(0);
- }
- continue;
- #else
- case 'c':
- if (!_fmt(_CurrentTimeLocale->d_t_fmt, t))
- return(0);
- continue;
- case 'x':
- if (!_fmt(_CurrentTimeLocale->d_fmt, t))
- return(0);
- continue;
- case 'X':
- if (!_fmt(_CurrentTimeLocale->t_fmt, t))
- return(0);
- continue;
- #endif
- case 'y':
- if (!_conv((t->tm_year + TM_YEAR_BASE) % 100,
- 2, '0'))
- return(0);
- continue;
- case 'Y':
- if (!_conv((t->tm_year + TM_YEAR_BASE), 4, '0'))
- return(0);
- continue;
- case 'Z': {
- char *name = (isGMT ? "GMT" : TclpGetTZName(t->tm_isdst));
- int wrote;
- Tcl_UtfToExternal(NULL, NULL, name, -1, 0, NULL,
- pt, gsize, NULL, &wrote, NULL);
- pt += wrote;
- gsize -= wrote;
- 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) does.
- */
- default:
- break;
- }
- }
- if (!gsize--)
- return(0);
- *pt++ = *format;
- }
- return(gsize);
- }
- static int
- _secs(t)
- const struct tm *t;
- {
- static char buf[15];
- register time_t s;
- register char *p;
- struct tm tmp;
- /* Make a copy, mktime(3) modifies the tm struct. */
- tmp = *t;
- s = mktime(&tmp);
- for (p = buf + sizeof(buf) - 2; s > 0 && p > buf; s /= 10)
- *p-- = (char)(s % 10 + '0');
- return(_add(++p));
- }
- static int
- _conv(n, digits, pad)
- int n, digits;
- int pad;
- {
- static char buf[10];
- register char *p;
- p = buf + sizeof( buf ) - 1;
- *p-- = ' ';
- if ( n == 0 ) {
- *p-- = '0'; --digits;
- } else {
- for (; n > 0 && p > buf; n /= 10, --digits)
- *p-- = (char)(n % 10 + '0');
- }
- while (p > buf && digits-- > 0)
- *p-- = (char) pad;
- return(_add(++p));
- }
- static int
- _add(str)
- const char *str;
- {
- for (;; ++pt, --gsize) {
- if (!gsize)
- return(0);
- if (!(*pt = *str++))
- return(1);
- }
- }
- static int
- ISO8601Week( t, year )
- CONST struct tm* t;
- int* year;
- {
- /* Find the day-of-year of the Thursday in
- * the week in question. */
-
- int ydayThursday;
- int week;
- if ( t->tm_wday == 0 ) {
- ydayThursday = t->tm_yday - 3;
- } else {
- ydayThursday = t->tm_yday - t->tm_wday + 4;
- }
-
- if ( ydayThursday < 0 ) {
-
- /* This is the last week of the previous year. */
- if ( IsLeapYear(( t->tm_year + TM_YEAR_BASE - 1 )) ) {
- ydayThursday += 366;
- } else {
- ydayThursday += 365;
- }
- week = ydayThursday / 7 + 1;
- if ( year != NULL ) {
- *year = t->tm_year + 1899;
- }
-
- } else if ( ( IsLeapYear(( t -> tm_year + TM_YEAR_BASE ))
- && ydayThursday >= 366 )
- || ( !IsLeapYear(( t -> tm_year
- + TM_YEAR_BASE ))
- && ydayThursday >= 365 ) ) {
-
- /* This is week 1 of the following year */
-
- week = 1;
- if ( year != NULL ) {
- *year = t->tm_year + 1901;
- }
-
- } else {
-
- week = ydayThursday / 7 + 1;
- if ( year != NULL ) {
- *year = t->tm_year + 1900;
- }
-
- }
- return week;
-
- }