/*
* Modified slightly by Chet Ramey for inclusion in Bash
*/
/*
* strftime.c
*
* Public-domain implementation of ISO C library routine.
*
* If you can't do prototypes, get GCC.
*
* The C99 standard now specifies just about all of the formats
* that were additional in the earlier versions of this file.
*
* For extensions from SunOS, add SUNOS_EXT.
* For extensions from HP/UX, add HPUX_EXT.
* For VMS dates, add VMS_EXT.
* For complete POSIX semantics, add POSIX_SEMANTICS.
*
* The code for %c, %x, and %X follows the C99 specification for
* the "C" locale.
*
* This version ignores LOCALE information.
* It also doesn't worry about multi-byte characters.
* So there.
*
* This file is also shipped with GAWK (GNU Awk), gawk specific bits of
* code are included if GAWK is defined.
*
* Arnold Robbins
* January, February, March, 1991
* Updated March, April 1992
* Updated April, 1993
* Updated February, 1994
* Updated May, 1994
* Updated January, 1995
* Updated September, 1995
* Updated January, 1996
* Updated July, 1997
* Updated October, 1999
* Updated September, 2000
*
* Fixes from ado@elsie.nci.nih.gov,
* February 1991, May 1992
* Fixes from Tor Lillqvist tml@tik.vtt.fi,
* May 1993
* Further fixes from ado@elsie.nci.nih.gov,
* February 1994
* %z code from chip@chinacat.unicom.com,
* Applied September 1995
* %V code fixed (again) and %G, %g added,
* January 1996
* %v code fixed, better configuration,
* July 1997
* Moved to C99 specification.
* September 2000
*/
#include <config.h>
#ifndef GAWK
#include <stdio.h>
#include <ctype.h>
#include <time.h>
#endif
#if defined(TM_IN_SYS_TIME)
#include <sys/types.h>
#include <sys/time.h>
#endif
#include <stdlib.h>
#include <string.h>
/* defaults: season to taste */
#define SUNOS_EXT 1 /* stuff in SunOS strftime routine */
#define VMS_EXT 1 /* include %v for VMS date format */
#define HPUX_EXT 1 /* non-conflicting stuff in HP-UX date */
#ifndef GAWK
#define POSIX_SEMANTICS 1 /* call tzset() if TZ changes */
#endif
#undef strchr /* avoid AIX weirdness */
#if defined (SHELL)
extern char *get_string_value (const char *);
#endif
extern void tzset(void);
static int weeknumber(const struct tm *timeptr, int firstweekday);
static int iso8601wknum(const struct tm *timeptr);
#ifndef inline
#ifdef __GNUC__
#define inline __inline__
#else
#define inline /**/
#endif
#endif
#define range(low, item, hi) max(low, min(item, hi))
#if !defined(OS2) && !defined(MSDOS) && defined(HAVE_TZNAME)
extern char *tzname[2];
extern int daylight;
#if defined(SOLARIS) || defined(mips) || defined (M_UNIX)
extern long int timezone, altzone;
#else
# if defined (HPUX)
extern long int timezone;
# else
extern int timezone, altzone;
# endif /* !HPUX */
#endif /* !SOLARIS && !mips && !M_UNIX */
#endif
#undef min /* just in case */
/* min --- return minimum of two numbers */
static inline int
min(int a, int b)
{
return (a < b ? a : b);
}
#undef max /* also, just in case */
/* max --- return maximum of two numbers */
static inline int
max(int a, int b)
{
return (a > b ? a : b);
}
/* strftime --- produce formatted time */
size_t
strftime(char *s, size_t maxsize, const char *format, const struct tm *timeptr)
{
char *endp = s + maxsize;
char *start = s;
auto char tbuf[100];
long off;
int i, w, y;
static short first = 1;
#ifdef POSIX_SEMANTICS
static char *savetz = NULL;
static int savetzlen = 0;
char *tz;
#endif /* POSIX_SEMANTICS */
#ifndef HAVE_TM_ZONE
#ifndef HAVE_TM_NAME
#ifndef HAVE_TZNAME
extern char *timezone();
struct timeval tv;
struct timezone zone;
#endif /* HAVE_TZNAME */
#endif /* HAVE_TM_NAME */
#endif /* HAVE_TM_ZONE */
/* various tables, useful in North America */
static const char *days_a[] = {
"Sun", "Mon", "Tue", "Wed",
"Thu", "Fri", "Sat",
};
static const char *days_l[] = {
"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday",
};
static const char *months_a[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
};
static const char *months_l[] = {
"January", "February", "March", "April",
"May", "June", "July", "August", "September",
"October", "November", "December",
};
static const char *ampm[] = { "AM", "PM", };
if (s == NULL || format == NULL || timeptr == NULL || maxsize == 0)
return 0;
/* quick check if we even need to bother */
if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize)
return 0;
#ifndef POSIX_SEMANTICS
if (first) {
tzset();
first = 0;
}
#else /* POSIX_SEMANTICS */
#if defined (SHELL)
tz = get_string_value ("TZ");
#else
tz = getenv("TZ");
#endif
if (first) {
if (tz != NULL) {
int tzlen = strlen(tz);
savetz = (char *) malloc(tzlen + 1);
if (savetz != NULL) {
savetzlen = tzlen + 1;
strcpy(savetz, tz);
}
}
tzset();
first = 0;
}
/* if we have a saved TZ, and it is different, recapture and reset */
if (tz && savetz && (tz[0] != savetz[0] || strcmp(tz, savetz) != 0)) {
i = strlen(tz) + 1;
if (i > savetzlen) {
savetz = (char *) realloc(savetz, i);
if (savetz) {
savetzlen = i;
strcpy(savetz, tz);
}
} else
strcpy(savetz, tz);
tzset();
}
#endif /* POSIX_SEMANTICS */
for (; *format && s < endp - 1; format++) {
tbuf[0] = '\0';
if (*format != '%') {
*s++ = *format;
continue;
}
again:
switch (*++format) {
case '\0':
*s++ = '%';
goto out;
case '%':
*s++ = '%';
continue;
case 'a': /* abbreviated weekday name */
if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6)
strcpy(tbuf, "?");
else
strcpy(tbuf, days_a[timeptr->tm_wday]);
break;
case 'A': /* full weekday name */
if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6)
strcpy(tbuf, "?");
else
strcpy(tbuf, days_l[timeptr->tm_wday]);
break;
case 'b': /* abbreviated month name */
short_month:
if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11)
strcpy(tbuf, "?");
else
strcpy(tbuf, months_a[timeptr->tm_mon]);
break;
case 'B': /* full month name */
if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11)
strcpy(tbuf, "?");
else
strcpy(tbuf, months_l[timeptr->tm_mon]);
break;
case 'c': /* appropriate date and time representation */
/*
* This used to be:
*
* strftime(tbuf, sizeof tbuf, "%a %b %e %H:%M:%S %Y", timeptr);
*
* Now, per the ISO 1999 C standard, it this:
*/
strftime(tbuf, sizeof tbuf, "%A %B %d %T %Y", timeptr);
break;
case 'C':
century:
sprintf(tbuf, "%02d", (timeptr->tm_year + 1900) / 100);
break;
case 'd': /* day of the month, 01 - 31 */
i = range(1, timeptr->tm_mday, 31);
sprintf(tbuf, "%02d", i);
break;
case 'D': /* date as %m/%d/%y */
strftime(tbuf, sizeof tbuf, "%m/%d/%y", timeptr);
break;
case 'e': /* day of month, blank padded */
sprintf(tbuf, "%2d", range(1, timeptr->tm_mday, 31));
break;
case 'E':
/* POSIX (now C99) locale extensions, ignored for now */
goto again;
case 'F': /* ISO 8601 date representation */
strftime(tbuf, sizeof tbuf, "%Y-%m-%d", timeptr);
break;
case 'g':
case 'G':
/*
* Year of ISO week.
*
* If it's December but the ISO week number is one,
* that week is in next year.
* If it's January but the ISO week number is 52 or
* 53, that week is in last year.
* Otherwise, it's this year.
*/
w = iso8601wknum(timeptr);
if (timeptr->tm_mon == 11 && w == 1)
y = 1900 + timeptr->tm_year + 1;
else if (timeptr->tm_mon == 0 && w >= 52)
y = 1900 + timeptr->tm_year - 1;
else
y = 1900 + timeptr->tm_year;
if (*format == 'G')
sprintf(tbuf, "%d", y);
else
sprintf(tbuf, "%02d", y % 100);
break;
case 'h': /* abbreviated month name */
goto short_month;
case 'H': /* hour, 24-hour clock, 00 - 23 */
i = range(0, timeptr->tm_hour, 23);
sprintf(tbuf, "%02d", i);
break;
case 'I': /* hour, 12-hour clock, 01 - 12 */
i = range(0, timeptr->tm_hour, 23);
if (i == 0)
i = 12;
else if (i > 12)
i -= 12;
sprintf(tbuf, "%02d", i);
break;
case 'j': /* day of the year, 001 - 366 */
sprintf(tbuf, "%03d", timeptr->tm_yday + 1);
break;
case 'm': /* month, 01 - 12 */
i = range(0, timeptr->tm_mon, 11);
sprintf(tbuf, "%02d", i + 1);
break;
case 'M': /* minute, 00 - 59 */
i = range(0, timeptr->tm_min, 59);
sprintf(tbuf, "%02d", i);
break;
case 'n': /* same as \n */
tbuf[0] = '\n';
tbuf[1] = '\0';
break;
case 'O':
/* POSIX (now C99) locale extensions, ignored for now */
goto again;
case 'p': /* am or pm based on 12-hour clock */
i = range(0, timeptr->tm_hour, 23);
if (i < 12)
strcpy(tbuf, ampm[0]);
else
strcpy(tbuf, ampm[1]);
break;
case 'r': /* time as %I:%M:%S %p */
strftime(tbuf, sizeof tbuf, "%I:%M:%S %p", timeptr);
break;
case 'R': /* time as %H:%M */
strftime(tbuf, sizeof tbuf, "%H:%M", timeptr);
break;
#if defined(HAVE_MKTIME) || defined(GAWK)
case 's': /* time as seconds since the Epoch */
{
struct tm non_const_timeptr;
non_const_timeptr = *timeptr;
sprintf(tbuf, "%ld", mktime(& non_const_timeptr));
break;
}
#endif /* defined(HAVE_MKTIME) || defined(GAWK) */
case 'S': /* second, 00 - 60 */
i = range(0, timeptr->tm_sec, 60);
sprintf(tbuf, "%02d", i);
break;
case 't': /* same as \t */
tbuf[0] = '\t';
tbuf[1] = '\0';
break;
case 'T': /* time as %H:%M:%S */
the_time:
strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr);
break;
case 'u':
/* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */
sprintf(tbuf, "%d", timeptr->tm_wday == 0 ? 7 :
timeptr->tm_wday);
break;
case 'U': /* week of year, Sunday is first day of week */
sprintf(tbuf, "%02d", weeknumber(timeptr, 0));
break;
case 'V': /* week of year according ISO 8601 */
sprintf(tbuf, "%02d", iso8601wknum(timeptr));
break;
case 'w': /* weekday, Sunday == 0, 0 - 6 */
i = range(0, timeptr->tm_wday, 6);
sprintf(tbuf, "%d", i);
break;
case 'W': /* week of year, Monday is first day of week */
sprintf(tbuf, "%02d", weeknumber(timeptr, 1));
break;
case 'x': /* appropriate date representation */
strftime(tbuf, sizeof tbuf, "%A %B %d %Y", timeptr);
break;
case 'X': /* appropriate time representation */
goto the_time;
break;
case 'y': /* year without a century, 00 - 99 */
year:
i = timeptr->tm_year % 100;
sprintf(tbuf, "%02d", i);
break;
case 'Y': /* year with century */
fullyear:
sprintf(tbuf, "%d", 1900 + timeptr->tm_year);
break;
/*
* From: Chip Rosenthal <chip@chinacat.unicom.com>
* Date: Sun, 19 Mar 1995 00:33:29 -0600 (CST)
*
* Warning: the %z [code] is implemented by inspecting the
* timezone name conditional compile settings, and
* inferring a method to get timezone offsets. I've tried
* this code on a couple of machines, but I don't doubt
* there is some system out there that won't like it.
* Maybe the easiest thing to do would be to bracket this
* with an #ifdef that can turn it off. The %z feature
* would be an admittedly obscure one that most folks can
* live without, but it would be a great help to those of
* us that muck around with various message processors.
*/
case 'z': /* time zone offset east of GMT e.g. -0600 */
#ifdef HAVE_TM_NAME
/*
* Systems with tm_name probably have tm_tzadj as
* secs west of GMT. Convert to mins east of GMT.
*/
off = -timeptr->tm_tzadj / 60;
#else /* !HAVE_TM_NAME */
#ifdef HAVE_TM_ZONE
/*
* Systems with tm_zone probably have tm_gmtoff as
* secs east of GMT. Convert to mins east of GMT.
*/
off = timeptr->tm_gmtoff / 60;
#else /* !HAVE_TM_ZONE */
#if HAVE_TZNAME
/*
* Systems with tzname[] probably have timezone as
* secs west of GMT. Convert to mins east of GMT.
*/
# ifdef HPUX
off = -timezone / 60;
# else
off = -(daylight ? timezone : altzone) / 60;
# endif /* !HPUX */
#else /* !HAVE_TZNAME */
gettimeofday(& tv, & zone);
off = -zone.tz_minuteswest;
#endif /* !HAVE_TZNAME */
#endif /* !HAVE_TM_ZONE */
#endif /* !HAVE_TM_NAME */
if (off < 0) {
tbuf[0] = '-';
off = -off;
} else {
tbuf[0] = '+';
}
sprintf(tbuf+1, "%02d%02d", off/60, off%60);
break;
case 'Z': /* time zone name or abbrevation */
#ifdef HAVE_TZNAME
i = (daylight && timeptr->tm_isdst > 0); /* 0 or 1 */
strcpy(tbuf, tzname[i]);
#else
#ifdef HAVE_TM_ZONE
strcpy(tbuf, timeptr->tm_zone);
#else
#ifdef HAVE_TM_NAME
strcpy(tbuf, timeptr->tm_name);
#else
gettimeofday(& tv, & zone);
strcpy(tbuf, timezone(zone.tz_minuteswest,
timeptr->tm_isdst > 0));
#endif /* HAVE_TM_NAME */
#endif /* HAVE_TM_ZONE */
#endif /* HAVE_TZNAME */
break;
#ifdef SUNOS_EXT
case 'k': /* hour, 24-hour clock, blank pad */
sprintf(tbuf, "%2d", range(0, timeptr->tm_hour, 23));
break;
case 'l':