/* exp_strp.c - functions for exp_timestamp */
/*
* strftime.c
*
* Public-domain implementation of ANSI C library routine.
*
* 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 VMS dates, add VMS_EXT.
* For complete POSIX semantics, add POSIX_SEMANTICS.
*
* The code for %c, %x, and %X now follows the 1003.2 specification for
* the POSIX 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 <arnold@skeeve.atl.ga.us>
* January, February, March, 1991
* Updated March, April 1992
* Updated April, 1993
* Updated February, 1994
* Updated May, 1994
* Updated January 1995
* Updated September 1995
*
* 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
*
*
* Modified by Don Libes for Expect, 10/93 and 12/95.
* Forced POSIX semantics.
* Replaced inline/min/max stuff with a single range function.
* Removed tzset stuff.
* Commented out tzname stuff.
*
* According to Arnold, the current version of this code can ftp'd from
* ftp.mathcs.emory.edu:/pub/arnold/strftime.shar.gz
*
*/
#include "expect_cf.h"
#include "tcl.h"
#include <stdio.h>
#include <ctype.h>
#include "string.h"
/* according to Karl Vogel, time.h is insufficient on Pyramid */
/* following is recommended by autoconf */
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#include <sys/types.h>
#define SYSV_EXT 1 /* stuff in System V ascftime routine */
#define POSIX2_DATE 1 /* stuff in Posix 1003.2 date command */
#if defined(POSIX2_DATE) && ! defined(SYSV_EXT)
#define SYSV_EXT 1
#endif
#if defined(POSIX2_DATE)
#define adddecl(stuff) stuff
#else
#define adddecl(stuff)
#endif
#ifndef __STDC__
#define const
extern char *getenv();
static int weeknumber();
adddecl(static int iso8601wknum();)
#else
#ifndef strchr
extern char *strchr(const char *str, int ch);
#endif
extern char *getenv(const char *v);
static int weeknumber(const struct tm *timeptr, int firstweekday);
adddecl(static int iso8601wknum(const struct tm *timeptr);)
#endif
/* attempt to use strftime to compute timezone, else fallback to */
/* less portable ways */
#if !defined(HAVE_STRFTIME)
# if defined(HAVE_SV_TIMEZONE)
extern char *tzname[2];
extern int daylight;
# else
# if defined(HAVE_TIMEZONE)
char *
zone_name (tp)
struct tm *tp;
{
char *timezone ();
struct timeval tv;
struct timezone tz;
gettimeofday (&tv, &tz);
return timezone (tz.tz_minuteswest, tp->tm_isdst);
}
# endif /* HAVE_TIMEZONE */
# endif /* HAVE_SV_TIMEZONE */
#endif /* HAVE_STRFTIME */
static int
range(low,item,hi)
int low, item, hi;
{
if (item < low) return low;
if (item > hi) return hi;
return item;
}
/* strftime --- produce formatted time */
void
/*size_t*/
#ifndef __STDC__
exp_strftime(/*s,*/ format, timeptr, dstring)
/*char *s;*/
char *format;
const struct tm *timeptr;
Tcl_DString *dstring;
#else
/*exp_strftime(char *s, size_t maxsize, const char *format, const struct tm *timeptr)*/
exp_strftime(char *format, const struct tm *timeptr,Tcl_DString *dstring)
#endif
{
int copied; /* used to suppress copying when called recursively */
#if 0
char *endp = s + maxsize;
char *start = s;
#endif
char *percentptr;
char tbuf[100];
int i;
/* 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", };
/* for (; *format && s < endp - 1; format++) {*/
for (; *format ; format++) {
tbuf[0] = '\0';
copied = 0; /* has not been copied yet */
percentptr = strchr(format,'%');
if (percentptr == 0) {
Tcl_DStringAppend(dstring,format,-1);
goto out;
} else if (percentptr != format) {
Tcl_DStringAppend(dstring,format,percentptr - format);
format = percentptr;
}
#if 0
if (*format != '%') {
*s++ = *format;
continue;
}
#endif
again:
switch (*++format) {
case '\0':
Tcl_DStringAppend(dstring,"%",1);
#if 0
*s++ = '%';
#endif
goto out;
case '%':
Tcl_DStringAppend(dstring,"%",1);
copied = 1;
break;
#if 0
*s++ = '%';
continue;
#endif
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;
#ifdef SYSV_EXT
case 'h': /* abbreviated month name */
#endif
case 'b': /* abbreviated month name */
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 */
sprintf(tbuf, "%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);
sprintf(tbuf, "%02d", i);
break;
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 '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 'S': /* second, 00 - 61 */
i = range(0, timeptr->tm_sec, 61);
sprintf(tbuf, "%02d", i);
break;
case 'U': /* week of year, Sunday is first day of week */
sprintf(tbuf, "%02d", weeknumber(timeptr, 0));
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 */
sprintf(tbuf, "%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 */
sprintf(tbuf, "%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;
sprintf(tbuf, "%02d", i);
break;
case 'Y': /* year with century */
sprintf(tbuf, "%d", 1900 + timeptr->tm_year);
break;
case 'Z': /* time zone name or abbrevation */
#if defined(HAVE_STRFTIME)
strftime(tbuf,sizeof tbuf,"%Z",timeptr);
#else
# if defined(HAVE_SV_TIMEZONE)
i = 0;
if (daylight && timeptr->tm_isdst)
i = 1;
strcpy(tbuf, tzname[i]);
# else
strcpy(tbuf, zone_name (timeptr));
# if defined(HAVE_TIMEZONE)
# endif /* HAVE_TIMEZONE */
/* no timezone available */
/* feel free to add others here */
# endif /* HAVE_SV_TIMEZONE */
#endif /* HAVE STRFTIME */
break;
#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 */
exp_strftime("%m/%d/%y", timeptr, dstring);
copied = 1;
/* exp_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 'r': /* time as %I:%M:%S %p */
exp_strftime("%I:%M:%S %p", timeptr, dstring);
copied = 1;
/* exp_strftime(tbuf, sizeof tbuf, "%I:%M:%S %p", timeptr);*/
break;
case 'R': /* time as %H:%M */
exp_strftime("%H:%M", timeptr, dstring);
copied = 1;
/* exp_strftime(tbuf, sizeof tbuf, "%H:%M", timeptr);*/
break;
case 'T': /* time as %H:%M:%S */
exp_strftime("%H:%M:%S", timeptr, dstring);
copied = 1;
/* exp_strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr);*/
break;
#endif
#ifdef POSIX2_DATE
case 'C':
sprintf(tbuf, "%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 */
sprintf(tbuf, "%02d", iso8601wknum(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;
#endif /* POSIX2_DATE */
default:
tbuf[0] = '%';
tbuf[1] = *format;
tbuf[2] = '\0';
break;
}
if (!copied)
Tcl_DStringAppend(dstring,tbuf,-1);
#if 0
i = strlen(tbuf);
if (i) {
if (s + i < endp - 1) {
strcpy(s, tbuf);
s += i;
} else
return 0;
#endif
}
out:;
#if 0
if (s < endp && *format == '\0') {
*s = '\0';
return (s - start);
} else
return 0;
#endif
}
/* isleap --- is a year a leap year? */
#ifndef __STDC__
static int
isleap(year)
int year;
#else
static int
isleap(int year)
#endif
{
return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
}
#ifdef POSIX2_DATE
/* iso8601wknum --- compute week number according to ISO 8601 */
#ifndef __STDC__
static int
iso8601wknum(timeptr)
const struct tm *timeptr;
#else
static int
iso8601wknum(const struct tm *timeptr)
#endif
{
/*
* From 1003.2:
* 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 the highest numbered week of the previous
* (52 or 53) 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.
*
* XPG4 erroneously included POSIX.2 rationale text in the
* main body of the standard. Thus it requires week 53.
*/
int weeknum, jan1day;
/* get week number, Monday as first day of the week */
weeknum = weeknumber(timeptr, 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 highest week, which is
* this year's week 0.
*
* What does that mean?
* If Jan 1 was Monday, the week number is exactly right, it can
* never be 0.
* If it was Tuesday through Thursday, the weeknumber is one
* less than it should be, so we add one.
* Otherwise, Friday, Saturday or Sunday, the week number is
* OK, but if it is 0, it needs to be 52 or 53.
*/
switch (jan1day) {
case 1: /* Monday */
break;
case 2: /* Tuesday */
case 3: /* Wednesday */
case 4: /* Thursday */
weeknum++;
break;
case 5: /* Friday */
case 6: /* Saturday */
case 0: /* Sunday */
if (weeknum == 0) {
#ifdef USE_BROKEN_XPG4
/* XPG4 (as of March 1994) says 53 unconditionally */
weeknum = 53;
#else
/* get week number of last week of last year */
struct tm dec31ly; /* 12/31 last year */
dec31ly = *timeptr;
dec31ly.tm_year--;
dec31ly.tm_mon = 11;
dec31ly.tm_mday = 31;
dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1;
dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900);
weeknum = iso8601wknum(& dec31ly);
#endif
}
break;
}
if (timeptr->tm_mon == 11) {
/*
* The last week of the year
* can be in week 1 of next year.
* Sigh.
*
* This can only happen if
* M T W
* 29 30 31
* 30 31
* 31
*/
int wday, mday;
wday = timeptr->tm_wday;
mday = timeptr->tm_mday;
if ( (wday == 1 && (mday >= 29 && mday <= 31))
|| (wday == 2 && (mday == 30 || mday == 31))
|| (wday == 3 && mday == 31))
weeknum = 1;
}
return weeknum;
}
#endif
/* weeknumber --- figure how many weeks into the year */
/* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */
#ifndef __STDC__
static int
weeknumber(timeptr, firstweekday)
const struct tm *timeptr;
int firstweekday;
#else
static int
weeknumber(const struct tm *timeptr, int firstweekday)
#endif
{
int wday = timeptr->tm_wday;
int ret;
if (firstweekday == 1) {
if (wday == 0) /* sunday */
wday = 6;
else
wday--;
}
ret = ((timeptr->tm_yday + 7 - wday) / 7);
if (ret < 0)
ret = 0;
return ret;
}
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