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/* 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, diff;

        /* 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;

}