208b582201
strftime(3), add another one. :) %z yields the local timezone's offset in hours and minutes, as used in RFC822 headers. There's a precedence for this in Lunux' libc, and Internet software (like Perl scripts) start using it. OKed by (wrt. the code freeze): jkh
459 lines
11 KiB
C
459 lines
11 KiB
C
/*
|
|
* Copyright (c) 1989 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted
|
|
* provided that the above copyright notice and this paragraph are
|
|
* duplicated in all such forms and that any documentation,
|
|
* advertising materials, and other materials related to such
|
|
* distribution and use acknowledge that the software was developed
|
|
* by the University of California, Berkeley. The name of the
|
|
* University may not be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*/
|
|
|
|
#ifdef LIBC_RCS
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif
|
|
|
|
#ifndef lint
|
|
#ifndef NOID
|
|
static const char elsieid[] = "@(#)strftime.c 7.38";
|
|
/*
|
|
** Based on the UCB version with the ID appearing below.
|
|
** This is ANSIish only when "multibyte character == plain character".
|
|
*/
|
|
#endif /* !defined NOID */
|
|
#endif /* !defined lint */
|
|
|
|
#include "private.h"
|
|
|
|
#ifndef LIBC_SCCS
|
|
#ifndef lint
|
|
static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89";
|
|
#endif /* !defined lint */
|
|
#endif /* !defined LIBC_SCCS */
|
|
|
|
#include "tzfile.h"
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
#include "timelocal.h"
|
|
|
|
static char * _add P((const char *, char *, const char *));
|
|
static char * _conv P((int, const char *, char *, const char *));
|
|
static char * _fmt P((const char *, const struct tm *, char *, const char *));
|
|
|
|
size_t strftime P((char *, size_t, const char *, const struct tm *));
|
|
|
|
extern char * tzname[];
|
|
|
|
size_t
|
|
strftime(s, maxsize, format, t)
|
|
char *const s;
|
|
const size_t maxsize;
|
|
const char *const format;
|
|
const struct tm *const t;
|
|
{
|
|
char *p;
|
|
|
|
tzset();
|
|
p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize);
|
|
if (p == s + maxsize)
|
|
return 0;
|
|
*p = '\0';
|
|
return p - s;
|
|
}
|
|
|
|
static char *
|
|
_fmt(format, t, pt, ptlim)
|
|
const char *format;
|
|
const struct tm *const t;
|
|
char *pt;
|
|
const char *const ptlim;
|
|
{
|
|
int Ealternative, Oalternative;
|
|
|
|
for ( ; *format; ++format) {
|
|
if (*format == '%') {
|
|
Ealternative = 0;
|
|
Oalternative = 0;
|
|
label:
|
|
switch (*++format) {
|
|
case '\0':
|
|
--format;
|
|
break;
|
|
case 'A':
|
|
pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ?
|
|
"?" : Locale->weekday[t->tm_wday],
|
|
pt, ptlim);
|
|
continue;
|
|
case 'a':
|
|
pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ?
|
|
"?" : Locale->wday[t->tm_wday],
|
|
pt, ptlim);
|
|
continue;
|
|
case 'B':
|
|
pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ?
|
|
"?" : (Oalternative ? Locale->alt_month :
|
|
Locale->month)[t->tm_mon],
|
|
pt, ptlim);
|
|
continue;
|
|
case 'b':
|
|
case 'h':
|
|
pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ?
|
|
"?" : Locale->mon[t->tm_mon],
|
|
pt, ptlim);
|
|
continue;
|
|
case 'C':
|
|
/*
|
|
** %C used to do a...
|
|
** _fmt("%a %b %e %X %Y", t);
|
|
** ...whereas now POSIX 1003.2 calls for
|
|
** something completely different.
|
|
** (ado, 5/24/93)
|
|
*/
|
|
pt = _conv((t->tm_year + TM_YEAR_BASE) / 100,
|
|
"%02d", pt, ptlim);
|
|
continue;
|
|
case 'c':
|
|
pt = _fmt(Locale->c_fmt, t, pt, ptlim);
|
|
continue;
|
|
case 'D':
|
|
pt = _fmt("%m/%d/%y", t, pt, ptlim);
|
|
continue;
|
|
case 'd':
|
|
pt = _conv(t->tm_mday, "%02d", pt, ptlim);
|
|
continue;
|
|
case 'E':
|
|
if (Ealternative || Oalternative)
|
|
break;
|
|
Ealternative++;
|
|
goto label;
|
|
case 'O':
|
|
/*
|
|
** POSIX locale extensions, a la
|
|
** Arnold Robbins' strftime version 3.0.
|
|
** The sequences
|
|
** %Ec %EC %Ex %EX %Ey %EY
|
|
** %Od %oe %OH %OI %Om %OM
|
|
** %OS %Ou %OU %OV %Ow %OW %Oy
|
|
** are supposed to provide alternate
|
|
** representations.
|
|
** (ado, 5/24/93)
|
|
**
|
|
** FreeBSD extensions
|
|
** %OB %Ef %EF
|
|
*/
|
|
if (Ealternative || Oalternative)
|
|
break;
|
|
Oalternative++;
|
|
goto label;
|
|
case 'e':
|
|
pt = _conv(t->tm_mday, "%2d", pt, ptlim);
|
|
continue;
|
|
case 'f':
|
|
if (!Ealternative)
|
|
break;
|
|
pt = _fmt(Locale->Ef_fmt, t, pt, ptlim);
|
|
continue;
|
|
case 'F':
|
|
if (!Ealternative)
|
|
break;
|
|
pt = _fmt(Locale->EF_fmt, t, pt, ptlim);
|
|
continue;
|
|
case 'H':
|
|
pt = _conv(t->tm_hour, "%02d", pt, ptlim);
|
|
continue;
|
|
case 'I':
|
|
pt = _conv((t->tm_hour % 12) ?
|
|
(t->tm_hour % 12) : 12,
|
|
"%02d", pt, ptlim);
|
|
continue;
|
|
case 'j':
|
|
pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim);
|
|
continue;
|
|
case 'k':
|
|
/*
|
|
** This used to be...
|
|
** _conv(t->tm_hour % 12 ?
|
|
** t->tm_hour % 12 : 12, 2, ' ');
|
|
** ...and has been changed to the below to
|
|
** match SunOS 4.1.1 and Arnold Robbins'
|
|
** strftime version 3.0. That is, "%k" and
|
|
** "%l" have been swapped.
|
|
** (ado, 5/24/93)
|
|
*/
|
|
pt = _conv(t->tm_hour, "%2d", pt, ptlim);
|
|
continue;
|
|
#ifdef KITCHEN_SINK
|
|
case 'K':
|
|
/*
|
|
** After all this time, still unclaimed!
|
|
*/
|
|
pt = _add("kitchen sink", pt, ptlim);
|
|
continue;
|
|
#endif /* defined KITCHEN_SINK */
|
|
case 'l':
|
|
/*
|
|
** This used to be...
|
|
** _conv(t->tm_hour, 2, ' ');
|
|
** ...and has been changed to the below to
|
|
** match SunOS 4.1.1 and Arnold Robbin's
|
|
** strftime version 3.0. That is, "%k" and
|
|
** "%l" have been swapped.
|
|
** (ado, 5/24/93)
|
|
*/
|
|
pt = _conv((t->tm_hour % 12) ?
|
|
(t->tm_hour % 12) : 12,
|
|
"%2d", pt, ptlim);
|
|
continue;
|
|
case 'M':
|
|
pt = _conv(t->tm_min, "%02d", pt, ptlim);
|
|
continue;
|
|
case 'm':
|
|
pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim);
|
|
continue;
|
|
case 'n':
|
|
pt = _add("\n", pt, ptlim);
|
|
continue;
|
|
case 'p':
|
|
pt = _add((t->tm_hour >= 12) ?
|
|
Locale->pm :
|
|
Locale->am,
|
|
pt, ptlim);
|
|
continue;
|
|
case 'R':
|
|
pt = _fmt("%H:%M", t, pt, ptlim);
|
|
continue;
|
|
case 'r':
|
|
pt = _fmt("%I:%M:%S %p", t, pt, ptlim);
|
|
continue;
|
|
case 'S':
|
|
pt = _conv(t->tm_sec, "%02d", pt, ptlim);
|
|
continue;
|
|
case 's':
|
|
{
|
|
struct tm tm;
|
|
char buf[INT_STRLEN_MAXIMUM(
|
|
time_t) + 1];
|
|
time_t mkt;
|
|
|
|
tm = *t;
|
|
mkt = mktime(&tm);
|
|
if (TYPE_SIGNED(time_t))
|
|
(void) sprintf(buf, "%ld",
|
|
(long) mkt);
|
|
else (void) sprintf(buf, "%lu",
|
|
(unsigned long) mkt);
|
|
pt = _add(buf, pt, ptlim);
|
|
}
|
|
continue;
|
|
case 'T':
|
|
pt = _fmt("%H:%M:%S", t, pt, ptlim);
|
|
continue;
|
|
case 't':
|
|
pt = _add("\t", pt, ptlim);
|
|
continue;
|
|
case 'U':
|
|
pt = _conv((t->tm_yday + 7 - t->tm_wday) / 7,
|
|
"%02d", pt, ptlim);
|
|
continue;
|
|
case 'u':
|
|
/*
|
|
** From Arnold Robbins' strftime version 3.0:
|
|
** "ISO 8601: Weekday as a decimal number
|
|
** [1 (Monday) - 7]"
|
|
** (ado, 5/24/93)
|
|
*/
|
|
pt = _conv((t->tm_wday == 0) ? 7 : t->tm_wday,
|
|
"%d", pt, ptlim);
|
|
continue;
|
|
case 'V': /* ISO 8601 week number */
|
|
case 'G': /* ISO 8601 year (four digits) */
|
|
case 'g': /* ISO 8601 year (two digits) */
|
|
/*
|
|
** From Arnold Robbins' strftime version 3.0: "the week number of the
|
|
** year (the first Monday as the first day of week 1) as a decimal number
|
|
** (01-53)."
|
|
** (ado, 1993-05-24)
|
|
**
|
|
** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn:
|
|
** "Week 01 of a year is per definition the first week which has the
|
|
** Thursday in this year, which is equivalent to the week which contains
|
|
** the fourth day of January. In other words, the first week of a new year
|
|
** is the week which has the majority of its days in the new year. Week 01
|
|
** might also contain days from the previous year and the week before week
|
|
** 01 of a year is the last week (52 or 53) of the previous year even if
|
|
** it contains days from the new year. A week starts with Monday (day 1)
|
|
** and ends with Sunday (day 7). For example, the first week of the year
|
|
** 1997 lasts from 1996-12-30 to 1997-01-05..."
|
|
** (ado, 1996-01-02)
|
|
*/
|
|
{
|
|
int year;
|
|
int yday;
|
|
int wday;
|
|
int w;
|
|
|
|
year = t->tm_year + TM_YEAR_BASE;
|
|
yday = t->tm_yday;
|
|
wday = t->tm_wday;
|
|
for ( ; ; ) {
|
|
int len;
|
|
int bot;
|
|
int top;
|
|
|
|
len = isleap(year) ?
|
|
DAYSPERLYEAR :
|
|
DAYSPERNYEAR;
|
|
/*
|
|
** What yday (-3 ... 3) does
|
|
** the ISO year begin on?
|
|
*/
|
|
bot = ((yday + 11 - wday) %
|
|
DAYSPERWEEK) - 3;
|
|
/*
|
|
** What yday does the NEXT
|
|
** ISO year begin on?
|
|
*/
|
|
top = bot -
|
|
(len % DAYSPERWEEK);
|
|
if (top < -3)
|
|
top += DAYSPERWEEK;
|
|
top += len;
|
|
if (yday >= top) {
|
|
++year;
|
|
w = 1;
|
|
break;
|
|
}
|
|
if (yday >= bot) {
|
|
w = 1 + ((yday - bot) /
|
|
DAYSPERWEEK);
|
|
break;
|
|
}
|
|
--year;
|
|
yday += isleap(year) ?
|
|
DAYSPERLYEAR :
|
|
DAYSPERNYEAR;
|
|
}
|
|
#ifdef XPG4_1994_04_09
|
|
if ((w == 52
|
|
&& t->tm_mon == TM_JANUARY)
|
|
|| (w == 1
|
|
&& t->tm_mon == TM_DECEMBER))
|
|
w = 53;
|
|
#endif /* defined XPG4_1994_04_09 */
|
|
if (*format == 'V')
|
|
pt = _conv(w, "%02d",
|
|
pt, ptlim);
|
|
else if (*format == 'g') {
|
|
pt = _conv(year % 100, "%02d",
|
|
pt, ptlim);
|
|
} else pt = _conv(year, "%04d",
|
|
pt, ptlim);
|
|
}
|
|
continue;
|
|
case 'v':
|
|
/*
|
|
** From Arnold Robbins' strftime version 3.0:
|
|
** "date as dd-bbb-YYYY"
|
|
** (ado, 5/24/93)
|
|
*/
|
|
pt = _fmt("%e-%b-%Y", t, pt, ptlim);
|
|
continue;
|
|
case 'W':
|
|
pt = _conv((t->tm_yday + 7 -
|
|
(t->tm_wday ?
|
|
(t->tm_wday - 1) : 6)) / 7,
|
|
"%02d", pt, ptlim);
|
|
continue;
|
|
case 'w':
|
|
pt = _conv(t->tm_wday, "%d", pt, ptlim);
|
|
continue;
|
|
case 'X':
|
|
pt = _fmt(Locale->X_fmt, t, pt, ptlim);
|
|
continue;
|
|
case 'x':
|
|
pt = _fmt(Locale->x_fmt, t, pt, ptlim);
|
|
continue;
|
|
case 'y':
|
|
pt = _conv((t->tm_year + TM_YEAR_BASE) % 100,
|
|
"%02d", pt, ptlim);
|
|
continue;
|
|
case 'Y':
|
|
pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d",
|
|
pt, ptlim);
|
|
continue;
|
|
case 'Z':
|
|
if (t->tm_zone != NULL)
|
|
pt = _add(t->tm_zone, pt, ptlim);
|
|
else
|
|
if (t->tm_isdst == 0 || t->tm_isdst == 1) {
|
|
pt = _add(tzname[t->tm_isdst],
|
|
pt, ptlim);
|
|
} else pt = _add("?", pt, ptlim);
|
|
continue;
|
|
case 'z':
|
|
{
|
|
long absoff;
|
|
if (t->tm_gmtoff >= 0) {
|
|
absoff = t->tm_gmtoff;
|
|
pt = _add("+", pt, ptlim);
|
|
} else {
|
|
absoff = -t->tm_gmtoff;
|
|
pt = _add("-", pt, ptlim);
|
|
}
|
|
pt = _conv(absoff / 3600, "%02d",
|
|
pt, ptlim);
|
|
pt = _conv((absoff % 3600) / 60, "%02d",
|
|
pt, ptlim);
|
|
};
|
|
continue;
|
|
case '+':
|
|
pt = _fmt(Locale->date_fmt, t, pt, ptlim);
|
|
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(n, format, pt, ptlim)
|
|
const int n;
|
|
const char *const format;
|
|
char *const pt;
|
|
const char *const ptlim;
|
|
{
|
|
char buf[INT_STRLEN_MAXIMUM(int) + 1];
|
|
|
|
(void) sprintf(buf, format, n);
|
|
return _add(buf, pt, ptlim);
|
|
}
|
|
|
|
static char *
|
|
_add(str, pt, ptlim)
|
|
const char *str;
|
|
char *pt;
|
|
const char *const ptlim;
|
|
{
|
|
while (pt < ptlim && (*pt = *str++) != '\0')
|
|
++pt;
|
|
return pt;
|
|
}
|