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[/] [or1k/] [trunk/] [insight/] [expect/] [exp_strf.c] - Rev 1767
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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; }
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