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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;
+
+ /* 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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