/*******************************************************************************
* The Elm Mail System - $Revision: 1.3 $ $State: Exp $
*
* Public-domain relatively quick-and-dirty implemenation of
* ANSI library routine for System V Unix systems.
*
* Arnold Robbins
*
*****************************************************************************
* Bug reports, patches, comments, suggestions should be sent to:
* (Note: this routine is provided as is, without support for those sites that
* do not have strftime in their library)
*
* Syd Weinstein, Elm Coordinator
* elm@DSI.COM dsinc!elm
*
*****************************************************************************
* $Log: strftime.c,v $
* Revision 1.3 1993/10/09 19:38:51 smace
* Update to elm 2.4 pl23 release version
*
* Revision 5.8 1993/08/23 02:46:51 syd
* Test ANSI_C, not __STDC__ (which is not set on e.g. AIX).
* From: decwrl!uunet.UU.NET!fin!chip (Chip Salzenberg)
*
* Revision 5.7 1993/08/03 19:28:39 syd
* Elm tries to replace the system toupper() and tolower() on current
* BSD systems, which is unnecessary. Even worse, the replacements
* collide during linking with routines in isctype.o. This patch adds
* a Configure test to determine whether replacements are really needed
* (BROKE_CTYPE definition). The <ctype.h> header file is now included
* globally through hdrs/defs.h and the BROKE_CTYPE patchup is handled
* there. Inclusion of <ctype.h> was removed from *all* the individual
* files, and the toupper() and tolower() routines in lib/opt_utils.c
* were dropped.
* From: chip@chinacat.unicom.com (Chip Rosenthal)
*
* Revision 5.6 1993/08/03 19:20:31 syd
* Implement new timezone handling. New file lib/get_tz.c with new timezone
* routines. Added new TZMINS_USE_xxxxxx and TZNAME_USE_xxxxxx configuration
* definitions. Obsoleted TZNAME, ALTCHECK, and TZ_MINUTESWEST configuration
* definitions. Updated Configure. Modified lib/getarpdate.c and
* lib/strftime.c to use new timezone routines.
* From: chip@chinacat.unicom.com (Chip Rosenthal)
*
* Revision 5.5 1993/06/10 03:17:45 syd
* Change from TZNAME_MISSING to TZNAME
* From: Syd via request from Dan Blanchard
*
* Revision 5.4 1993/05/08 19:56:45 syd
* update to newer version
* From: Syd
*
* Revision 5.3 1993/04/21 01:42:23 syd
* avoid name conflicts on min and max
*
* Revision 5.2 1993/04/16 04:29:34 syd
* attempt to bsdize a bit strftime
* From: many via syd
*
* Revision 5.1 1993/01/27 18:52:15 syd
* Initial checkin of contributed public domain routine.
* This routine is provided as is and not covered by Elm Copyright.
****************************************************************************/
/*
* strftime.c
*
* Public-domain relatively quick-and-dirty implementation of
* ANSI library routine for System V Unix systems.
*
* It's written in old-style C for maximal portability.
* However, since I'm used to prototypes, I've included them too.
*
* If you want stuff in the System V ascftime routine, add the SYSV_EXT define.
* For extensions from SunOS, add SUNOS_EXT.
* For stuff needed to implement the P1003.2 date command, add POSIX2_DATE.
* For complete POSIX semantics, add POSIX_SEMANTICS.
*
* The code for %c, %x, and %X is my best guess as to what's "appropriate".
* 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 May, 1993
*
* Fixes from ado@elsie.nci.nih.gov
* February 1991, May 1992
* Fixes from Tor Lillqvist tor@tik.vtt.fi
* May, 1993
*
* Fast-forward to July 2013...
*
* stephan@wanderinghorse.net copied these sources from:
*
* ftp://ftp-archive.freebsd.org/pub/FreeBSD-Archive/old-releases/i386/1.0-RELEASE/ports/elm/lib/strftime.c
*
* And made the following changes:
*
* Removed ancient non-ANSI decls. Added some headers to get it to
* compile for me. Renamed functions to fit into my project. Replaced
* hard tabs with 4 spaces. Added #undefs for all file-private #defines
* to safe-ify inclusion from/with other files.
*
*/
#include "fossil-scm/fossil-config.h"
#include <time.h>
/* #include <sys/time.h> */
#include <string.h> /* strchr() and friends */
#include <stdio.h> /* snprintf() */
#include <ctype.h> /* toupper(), islower() */
#include "fossil-scm/fossil-util.h"
#define HAVE_GET_TZ_NAME 0
#if HAVE_GET_TZ_NAME
extern char *get_tz_name();
#endif
#if !defined(BSD) && !defined(_MSC_VER)
extern void tzset (void);
#endif
static int weeknumber (const struct tm *timeptr, int firstweekday);
/* defaults: season to taste */
#define SYSV_EXT 1 /* stuff in System V ascftime routine */
#define SUNOS_EXT 1 /* stuff in SunOS strftime routine */
#define POSIX2_DATE 1 /* stuff in Posix 1003.2 date command */
#define VMS_EXT 1 /* include %v for VMS date format */
#if 0
#define POSIX_SEMANTICS 1 /* call tzset() if TZ changes */
#endif
#ifdef POSIX_SEMANTICS
#include <stdlib.h> /* malloc() and friends */
#endif
#if defined(POSIX2_DATE)
#if ! defined(SYSV_EXT)
#define SYSV_EXT 1
#endif
#if ! defined(SUNOS_EXT)
#define SUNOS_EXT 1
#endif
#endif
#if defined(POSIX2_DATE)
static int iso8601wknum(const struct tm *timeptr);
#endif
#undef strchr /* avoid AIX weirdness */
#ifdef __GNUC__
#define inline __inline__
#else
#define inline /**/
#endif
#define range(low, item, hi) maximum(low, minimum(item, hi))
/* minimum --- return minimum of two numbers */
static inline int
minimum(int a, int b)
{
return (a < b ? a : b);
}
/* maximum --- return maximum of two numbers */
static inline int
maximum(int a, int b)
{
return (a > b ? a : b);
}
/* strftime --- produce formatted time */
fsl_size_t
fsl_strftime(char *s, fsl_size_t maxsize, const char *format, const struct tm *timeptr)
{
enum {TBufLen = 100U};
char *endp = s + maxsize;
char *start = s;
char tbuf[TBufLen];
int i;
static short first = 1;
#ifdef POSIX_SEMANTICS
enum {TZBufLen = 200U};
static char savetz[TZBufLen] = {0};
char *tz;
#endif /* POSIX_SEMANTICS */
/* various tables, useful in North America */
static char *days_a[] = {
"Sun", "Mon", "Tue", "Wed",
"Thu", "Fri", "Sat"
};
static char *days_l[] = {
"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday"
};
static char *months_a[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static char *months_l[] = {
"January", "February", "March", "April",
"May", "June", "July", "August", "September",
"October", "November", "December"
};
static char *ampm[] = { "AM", "PM" };
if (s == NULL || format == NULL || timeptr == NULL || maxsize == 0)
return 0;
if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize)
return 0;
#ifndef POSIX_SEMANTICS
if (first) {
tzset();
first = 0;
}
#else /* POSIX_SEMANTICS */
tz = getenv("TZ");
if (first) {
if (tz != NULL) {
fsl_strlcpy(savetz, tz, TZBufLen);
}
tzset();
first = 0;
}
/* if we have a saved TZ, and it is different, recapture and reset */
if(tz && (tz[0] != savetz[0] || strcmp(tz, savetz) != 0)) {
i = strlen(tz) + 1;
if (i < TZBufLen) {
fsl_strlcpy(savetz, tz, TZBufLen);
}
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)
fsl_strlcpy(tbuf, "?", TBufLen);
else
fsl_strlcpy(tbuf, days_a[timeptr->tm_wday], TBufLen);
break;
case 'A': /* full weekday name */
if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6)
fsl_strlcpy(tbuf, "?", TBufLen);
else
fsl_strlcpy(tbuf, days_l[timeptr->tm_wday], TBufLen);
break;
#ifdef SYSV_EXT
case 'h': /* abbreviated month name */
#endif
case 'b': /* abbreviated month name */
if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11)
fsl_strlcpy(tbuf, "?", TBufLen);
else
fsl_strlcpy(tbuf, months_a[timeptr->tm_mon], TBufLen);
break;
case 'B': /* full month name */
if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11)
fsl_strlcpy(tbuf, "?", TBufLen);
else
fsl_strlcpy(tbuf, months_l[timeptr->tm_mon], TBufLen);
break;
case 'c': /* appropriate date and time representation */
snprintf(tbuf, TBufLen, "%s %s %2d %02d:%02d:%02d %d",
days_a[range(0, timeptr->tm_wday, 6)],
months_a[range(0, timeptr->tm_mon, 11)],
range(1, timeptr->tm_mday, 31),
range(0, timeptr->tm_hour, 23),
range(0, timeptr->tm_min, 59),
range(0, timeptr->tm_sec, 61),
timeptr->tm_year + 1900);
break;
case 'd': /* day of the month, 01 - 31 */
i = range(1, timeptr->tm_mday, 31);
snprintf(tbuf, TBufLen, "%02d", i);
break;
case 'H': /* hour, 24-hour clock, 00 - 23 */
i = range(0, timeptr->tm_hour, 23);
snprintf(tbuf, TBufLen, "%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;
snprintf(tbuf, TBufLen, "%02d", i);
break;
case 'j': /* day of the year, 001 - 366 */
snprintf(tbuf, TBufLen, "%03d", timeptr->tm_yday + 1);
break;
case 'm': /* month, 01 - 12 */
i = range(0, timeptr->tm_mon, 11);
snprintf(tbuf, TBufLen, "%02d", i + 1);
break;
case 'M': /* minute, 00 - 59 */
i = range(0, timeptr->tm_min, 59);
snprintf(tbuf, TBufLen, "%02d", i);
break;
case 'p': /* am or pm based on 12-hour clock */
i = range(0, timeptr->tm_hour, 23);
if (i < 12)
fsl_strlcpy(tbuf, ampm[0], TBufLen);
else
fsl_strlcpy(tbuf, ampm[1], TBufLen);
break;
case 'S': /* second, 00 - 61 */
i = range(0, timeptr->tm_sec, 61);
snprintf(tbuf, TBufLen, "%02d", i);
break;
case 'U': /* week of year, Sunday is first day of week */
snprintf(tbuf, TBufLen, "%d", weeknumber(timeptr, 0));
break;
case 'w': /* weekday, Sunday == 0, 0 - 6 */
i = range(0, timeptr->tm_wday, 6);
snprintf(tbuf, TBufLen, "%d", i);
break;
case 'W': /* week of year, Monday is first day of week */
snprintf(tbuf, TBufLen, "%d", weeknumber(timeptr, 1));
break;
case 'x': /* appropriate date representation */
snprintf(tbuf, TBufLen, "%s %s %2d %d",
days_a[range(0, timeptr->tm_wday, 6)],
months_a[range(0, timeptr->tm_mon, 11)],
range(1, timeptr->tm_mday, 31),
timeptr->tm_year + 1900);
break;
case 'X': /* appropriate time representation */
snprintf(tbuf, TBufLen, "%02d:%02d:%02d",
range(0, timeptr->tm_hour, 23),
range(0, timeptr->tm_min, 59),
range(0, timeptr->tm_sec, 61));
break;
case 'y': /* year without a century, 00 - 99 */
i = timeptr->tm_year % 100;
snprintf(tbuf, TBufLen, "%d", i);
break;
case 'Y': /* year with century */
snprintf(tbuf, TBufLen, "%d", 1900 + timeptr->tm_year);
break;
#if HAVE_GET_TZ_NAME
case 'Z': /* time zone name or abbrevation */
fsl_strlcpy(tbuf, get_tz_name(timeptr), TBufLen);
break;
#endif
#ifdef SYSV_EXT
case 'n': /* same as \n */
tbuf[0] = '\n';
tbuf[1] = '\0';
break;
case 't': /* same as \t */
tbuf[0] = '\t';
tbuf[1] = '\0';
break;
case 'D': /* date as %m/%d/%y */
fsl_strftime(tbuf, sizeof tbuf, "%m/%d/%y", timeptr);
break;
case 'e': /* day of month, blank padded */
snprintf(tbuf, TBufLen, "%2d", range(1, timeptr->tm_mday, 31));
break;
case 'r': /* time as %I:%M:%S %p */
fsl_strftime(tbuf, sizeof tbuf, "%I:%M:%S %p", timeptr);
break;
case 'R': /* time as %H:%M */
fsl_strftime(tbuf, sizeof tbuf, "%H:%M", timeptr);
break;
case 'T': /* time as %H:%M:%S */
fsl_strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr);
break;
#endif
#ifdef SUNOS_EXT
case 'k': /* hour, 24-hour clock, blank pad */
snprintf(tbuf, TBufLen, "%2d", range(0, timeptr->tm_hour, 23));
break;
case 'l': /* hour, 12-hour clock, 1 - 12, blank pad */
i = range(0, timeptr->tm_hour, 23);
if (i == 0)
i = 12;
else if (i > 12)
i -= 12;
snprintf(tbuf, TBufLen, "%2d", i);
break;
#endif
#ifdef VMS_EXT
case 'v': /* date as dd-bbb-YYYY */
snprintf(tbuf, TBufLen, "%2d-%3.3s-%4d",
range(1, timeptr->tm_mday, 31),
months_a[range(0, timeptr->tm_mon, 11)],
timeptr->tm_year + 1900);
for (i = 3; i < 6; i++)
if (islower((int)tbuf[i]))
tbuf[i] = toupper((int)tbuf[i]);
break;
#endif
#ifdef POSIX2_DATE
case 'C':
snprintf(tbuf, TBufLen, "%02d", (timeptr->tm_year + 1900) / 100);
break;
case 'E':
case 'O':
/* POSIX locale extensions, ignored for now */
goto again;
case 'V': /* week of year according ISO 8601 */
#if defined(GAWK) && defined(VMS_EXT)
{
extern int do_lint;
extern void warning();
static int warned = 0;
if (! warned && do_lint) {
warned = 1;
warning(
"conversion %%V added in P1003.2/11.3; for VMS style date, use %%v");
}
}
#endif
snprintf(tbuf, TBufLen, "%d", iso8601wknum(timeptr));
break;
case 'u':
/* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */
snprintf(tbuf, TBufLen, "%d", timeptr->tm_wday == 0 ? 7 :
timeptr->tm_wday);
break;
#endif /* POSIX2_DATE */
default:
tbuf[0] = '%';
tbuf[1] = *format;
tbuf[2] = '\0';
break;
}
i = strlen(tbuf);
if (i){
if (s + i < endp - 1) {
fsl_strlcpy(s, tbuf, TBufLen);
s += i;
} else return 0;
/* reminder: above IF originally had ambiguous else
placement (no braces). This placement _appears_ to be
correct.*/
}
}
out:
if (s < endp && *format == '\0') {
*s = '\0';
return (s - start);
} else
return 0;
}
#ifdef POSIX2_DATE
/* iso8601wknum --- compute week number according to ISO 8601 */
static int
iso8601wknum(const struct tm *timeptr)
{
/*
* From 1003.2 D11.3:
* If the week (Monday to Sunday) containing January 1
* has four or more days in the new year, then it is week 1;
* otherwise it is week 53 of the previous year, and the
* next week is week 1.
*
* ADR: This means if Jan 1 was Monday through Thursday,
* it was week 1, otherwise week 53.
*/
int simple_wknum, jan1day, diff, ret;
/* get week number, Monday as first day of the week */
simple_wknum = weeknumber(timeptr, 1) + 1;
/*
* With thanks and tip of the hatlo to tml@tik.vtt.fi
*
* What day of the week does January 1 fall on?
* We know that
* (timeptr->tm_yday - jan1.tm_yday) MOD 7 ==
* (timeptr->tm_wday - jan1.tm_wday) MOD 7
* and that
* jan1.tm_yday == 0
* and that
* timeptr->tm_wday MOD 7 == timeptr->tm_wday
* from which it follows that. . .
*/
jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7);
if (jan1day < 0)
jan1day += 7;
/*
* If Jan 1 was a Monday through Thursday, it was in
* week 1. Otherwise it was last year's week 53, which is
* this year's week 0.
*/
if (jan1day >= 1 && jan1day <= 4)
diff = 0;
else
diff = 1;
ret = simple_wknum - diff;
if (ret == 0) /* we're in the first week of the year */
ret = 53;
return ret;
}
#endif
/* weeknumber --- figure how many weeks into the year */
/* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */
static int
weeknumber(const struct tm *timeptr, int firstweekday)
{
if (firstweekday == 0)
return (timeptr->tm_yday + 7 - timeptr->tm_wday) / 7;
else
return (timeptr->tm_yday + 7 -
(timeptr->tm_wday ? (timeptr->tm_wday - 1) : 6)) / 7;
}
#undef SYSV_EXT
#undef SUNOS_EXT
#undef POSIX2_DATE
#undef VMS_EXT
#undef POSIX_SEMANTICS
#undef adddecl
#undef inline
#undef range
#undef maximum
#undef minimum
#undef HAVE_GET_TZ_NAME
#undef GAWK
/**
A convenience form of fsl_strftime() which takes its timestamp in
the form of a Unix Epoc time.
*/
fsl_size_t fsl_strftime_unix(char * dest, fsl_size_t destLen, char const * format,
fsl_time_t epochTime, bool convertToLocal){
time_t orig = (time_t)epochTime;
struct tm * tim = convertToLocal ? localtime(&orig) : gmtime(&orig);
return fsl_strftime( dest, destLen, format, tim );
}