]> git.ipfire.org Git - thirdparty/bash.git/blame - lib/sh/strftime.c
projects / thirdparty / bash.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
commit bash-20080814 snapshot
[thirdparty/bash.git] / lib / sh / strftime.c
CommitLineData
2e4498b3 1/* strftime - formatted time and date to a string */
7117c2d2
JA		 2/*
3 * Modified slightly by Chet Ramey for inclusion in Bash
4 */
7117c2d2
JA		 5/*
6 * strftime.c
7 *
8 * Public-domain implementation of ISO C library routine.
9 *
10 * If you can't do prototypes, get GCC.
11 *
12 * The C99 standard now specifies just about all of the formats
13 * that were additional in the earlier versions of this file.
14 *
15 * For extensions from SunOS, add SUNOS_EXT.
16 * For extensions from HP/UX, add HPUX_EXT.
17 * For VMS dates, add VMS_EXT.
18 * For complete POSIX semantics, add POSIX_SEMANTICS.
19 *
20 * The code for %c, %x, and %X follows the C99 specification for
21 * the "C" locale.
22 *
23 * This version ignores LOCALE information.
24 * It also doesn't worry about multi-byte characters.
25 * So there.
26 *
27 * This file is also shipped with GAWK (GNU Awk), gawk specific bits of
28 * code are included if GAWK is defined.
29 *
30 * Arnold Robbins
31 * January, February, March, 1991
32 * Updated March, April 1992
33 * Updated April, 1993
34 * Updated February, 1994
35 * Updated May, 1994
36 * Updated January, 1995
37 * Updated September, 1995
38 * Updated January, 1996
39 * Updated July, 1997
40 * Updated October, 1999
41 * Updated September, 2000
42 *
43 * Fixes from ado@elsie.nci.nih.gov,
44 * February 1991, May 1992
45 * Fixes from Tor Lillqvist tml@tik.vtt.fi,
46 * May 1993
47 * Further fixes from ado@elsie.nci.nih.gov,
48 * February 1994
49 * %z code from chip@chinacat.unicom.com,
50 * Applied September 1995
51 * %V code fixed (again) and %G, %g added,
52 * January 1996
53 * %v code fixed, better configuration,
54 * July 1997
55 * Moved to C99 specification.
56 * September 2000
57 */
58#include <config.h>
59
60#ifndef GAWK
61#include <stdio.h>
62#include <ctype.h>
63#include <time.h>
64#endif
65#if defined(TM_IN_SYS_TIME)
66#include <sys/types.h>
67#include <sys/time.h>
68#endif
69
70#include <stdlib.h>
71#include <string.h>
72
73/* defaults: season to taste */
74#define SUNOS_EXT 1 /* stuff in SunOS strftime routine */
75#define VMS_EXT 1 /* include %v for VMS date format */
76#define HPUX_EXT 1 /* non-conflicting stuff in HP-UX date */
77#ifndef GAWK
78#define POSIX_SEMANTICS 1 /* call tzset() if TZ changes */
79#endif
80
81#undef strchr /* avoid AIX weirdness */
82
de3341d1
CR		 83#if defined (SHELL)
84extern char *get_string_value (const char *);
85#endif
86
7117c2d2
JA		 87extern void tzset(void);
88static int weeknumber(const struct tm *timeptr, int firstweekday);
89static int iso8601wknum(const struct tm *timeptr);
90
54cdd75a 91#ifndef inline
7117c2d2
JA		 92#ifdef __GNUC__
93#define inline __inline__
94#else
95#define inline /**/
96#endif
54cdd75a 97#endif
7117c2d2
JA		 98
99#define range(low, item, hi) max(low, min(item, hi))
100
101#if !defined(OS2) && !defined(MSDOS) && defined(HAVE_TZNAME)
102extern char *tzname[2];
103extern int daylight;
5565fb1a 104#if defined(SOLARIS) || defined(mips) || defined (M_UNIX)
7117c2d2
JA		 105extern long int timezone, altzone;
106#else
de3341d1
CR		 107# if defined (HPUX)
108extern long int timezone;
109# else
7117c2d2 110extern int timezone, altzone;
de3341d1
CR		 111# endif /* !HPUX */
112#endif /* !SOLARIS && !mips && !M_UNIX */
7117c2d2
JA		 113#endif
114
115#undef min /* just in case */
116
117/* min --- return minimum of two numbers */
118
119static inline int
120min(int a, int b)
121{
122 return (a < b ? a : b);
123}
124
125#undef max /* also, just in case */
126
127/* max --- return maximum of two numbers */
128
129static inline int
130max(int a, int b)
131{
132 return (a > b ? a : b);
133}
134
135/* strftime --- produce formatted time */
136
137size_t
138strftime(char *s, size_t maxsize, const char *format, const struct tm *timeptr)
139{
140 char *endp = s + maxsize;
141 char *start = s;
142 auto char tbuf[100];
143 long off;
144 int i, w, y;
145 static short first = 1;
146#ifdef POSIX_SEMANTICS
147 static char *savetz = NULL;
148 static int savetzlen = 0;
149 char *tz;
150#endif /* POSIX_SEMANTICS */
151#ifndef HAVE_TM_ZONE
152#ifndef HAVE_TM_NAME
153#ifndef HAVE_TZNAME
154 extern char *timezone();
155 struct timeval tv;
156 struct timezone zone;
157#endif /* HAVE_TZNAME */
158#endif /* HAVE_TM_NAME */
159#endif /* HAVE_TM_ZONE */
160
161 /* various tables, useful in North America */
162 static const char *days_a[] = {
163 "Sun", "Mon", "Tue", "Wed",
164 "Thu", "Fri", "Sat",
165 };
166 static const char *days_l[] = {
167 "Sunday", "Monday", "Tuesday", "Wednesday",
168 "Thursday", "Friday", "Saturday",
169 };
170 static const char *months_a[] = {
171 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
172 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
173 };
174 static const char *months_l[] = {
175 "January", "February", "March", "April",
176 "May", "June", "July", "August", "September",
177 "October", "November", "December",
178 };
179 static const char *ampm[] = { "AM", "PM", };
180
181 if (s == NULL || format == NULL || timeptr == NULL || maxsize == 0)
182 return 0;
183
184 /* quick check if we even need to bother */
185 if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize)
186 return 0;
187
188#ifndef POSIX_SEMANTICS
189 if (first) {
190 tzset();
191 first = 0;
192 }
193#else /* POSIX_SEMANTICS */
194#if defined (SHELL)
195 tz = get_string_value ("TZ");
196#else
197 tz = getenv("TZ");
198#endif
199 if (first) {
200 if (tz != NULL) {
201 int tzlen = strlen(tz);
202
203 savetz = (char *) malloc(tzlen + 1);
204 if (savetz != NULL) {
205 savetzlen = tzlen + 1;
206 strcpy(savetz, tz);
207 }
208 }
209 tzset();
210 first = 0;
211 }
212 /* if we have a saved TZ, and it is different, recapture and reset */
213 if (tz && savetz && (tz[0] != savetz[0] || strcmp(tz, savetz) != 0)) {
214 i = strlen(tz) + 1;
215 if (i > savetzlen) {
216 savetz = (char *) realloc(savetz, i);
217 if (savetz) {
218 savetzlen = i;
219 strcpy(savetz, tz);
220 }
221 } else
222 strcpy(savetz, tz);
223 tzset();
224 }
225#endif /* POSIX_SEMANTICS */
226
227 for (; *format && s < endp - 1; format++) {
228 tbuf[0] = '\0';
229 if (*format != '%') {
230 *s++ = *format;
231 continue;
232 }
233 again:
234 switch (*++format) {
235 case '\0':
236 *s++ = '%';
237 goto out;
238
239 case '%':
240 *s++ = '%';
241 continue;
242
243 case 'a': /* abbreviated weekday name */
244 if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6)
245 strcpy(tbuf, "?");
246 else
247 strcpy(tbuf, days_a[timeptr->tm_wday]);
248 break;
249
250 case 'A': /* full weekday name */
251 if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6)
252 strcpy(tbuf, "?");
253 else
254 strcpy(tbuf, days_l[timeptr->tm_wday]);
255 break;
256
257 case 'b': /* abbreviated month name */
258 short_month:
259 if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11)
260 strcpy(tbuf, "?");
261 else
262 strcpy(tbuf, months_a[timeptr->tm_mon]);
263 break;
264
265 case 'B': /* full month name */
266 if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11)
267 strcpy(tbuf, "?");
268 else
269 strcpy(tbuf, months_l[timeptr->tm_mon]);
270 break;
271
272 case 'c': /* appropriate date and time representation */
273 /*
274 * This used to be:
275 *
276 * strftime(tbuf, sizeof tbuf, "%a %b %e %H:%M:%S %Y", timeptr);
277 *
278 * Now, per the ISO 1999 C standard, it this:
279 */
280 strftime(tbuf, sizeof tbuf, "%A %B %d %T %Y", timeptr);
281 break;
282
283 case 'C':
284 century:
285 sprintf(tbuf, "%02d", (timeptr->tm_year + 1900) / 100);
286 break;
287
288 case 'd': /* day of the month, 01 - 31 */
289 i = range(1, timeptr->tm_mday, 31);
290 sprintf(tbuf, "%02d", i);
291 break;
292
293 case 'D': /* date as %m/%d/%y */
294 strftime(tbuf, sizeof tbuf, "%m/%d/%y", timeptr);
295 break;
296
297 case 'e': /* day of month, blank padded */
298 sprintf(tbuf, "%2d", range(1, timeptr->tm_mday, 31));
299 break;
300
301 case 'E':
302 /* POSIX (now C99) locale extensions, ignored for now */
303 goto again;
304
305 case 'F': /* ISO 8601 date representation */
306 strftime(tbuf, sizeof tbuf, "%Y-%m-%d", timeptr);
307 break;
308
309 case 'g':
310 case 'G':
311 /*
312 * Year of ISO week.
313 *
314 * If it's December but the ISO week number is one,
315 * that week is in next year.
316 * If it's January but the ISO week number is 52 or
317 * 53, that week is in last year.
318 * Otherwise, it's this year.
319 */
320 w = iso8601wknum(timeptr);
321 if (timeptr->tm_mon == 11 && w == 1)
322 y = 1900 + timeptr->tm_year + 1;
323 else if (timeptr->tm_mon == 0 && w >= 52)
324 y = 1900 + timeptr->tm_year - 1;
325 else
326 y = 1900 + timeptr->tm_year;
327
328 if (*format == 'G')
329 sprintf(tbuf, "%d", y);
330 else
331 sprintf(tbuf, "%02d", y % 100);
332 break;
333
334 case 'h': /* abbreviated month name */
335 goto short_month;
336
337 case 'H': /* hour, 24-hour clock, 00 - 23 */
338 i = range(0, timeptr->tm_hour, 23);
339 sprintf(tbuf, "%02d", i);
340 break;
341
342 case 'I': /* hour, 12-hour clock, 01 - 12 */
343 i = range(0, timeptr->tm_hour, 23);
344 if (i == 0)
345 i = 12;
346 else if (i > 12)
347 i -= 12;
348 sprintf(tbuf, "%02d", i);
349 break;
350
351 case 'j': /* day of the year, 001 - 366 */
352 sprintf(tbuf, "%03d", timeptr->tm_yday + 1);
353 break;
354
355 case 'm': /* month, 01 - 12 */
356 i = range(0, timeptr->tm_mon, 11);
357 sprintf(tbuf, "%02d", i + 1);
358 break;
359
360 case 'M': /* minute, 00 - 59 */
361 i = range(0, timeptr->tm_min, 59);
362 sprintf(tbuf, "%02d", i);
363 break;
364
365 case 'n': /* same as \n */
366 tbuf[0] = '\n';
367 tbuf[1] = '\0';
368 break;
369
370 case 'O':
371 /* POSIX (now C99) locale extensions, ignored for now */
372 goto again;
373
374 case 'p': /* am or pm based on 12-hour clock */
375 i = range(0, timeptr->tm_hour, 23);
376 if (i < 12)
377 strcpy(tbuf, ampm[0]);
378 else
379 strcpy(tbuf, ampm[1]);
380 break;
381
382 case 'r': /* time as %I:%M:%S %p */
383 strftime(tbuf, sizeof tbuf, "%I:%M:%S %p", timeptr);
384 break;
385
386 case 'R': /* time as %H:%M */
387 strftime(tbuf, sizeof tbuf, "%H:%M", timeptr);
388 break;
389
390#if defined(HAVE_MKTIME) || defined(GAWK)
391 case 's': /* time as seconds since the Epoch */
392 {
393 struct tm non_const_timeptr;
394
395 non_const_timeptr = *timeptr;
396 sprintf(tbuf, "%ld", mktime(& non_const_timeptr));
397 break;
398 }
399#endif /* defined(HAVE_MKTIME) || defined(GAWK) */
400
401 case 'S': /* second, 00 - 60 */
402 i = range(0, timeptr->tm_sec, 60);
403 sprintf(tbuf, "%02d", i);
404 break;
405
406 case 't': /* same as \t */
407 tbuf[0] = '\t';
408 tbuf[1] = '\0';
409 break;
410
411 case 'T': /* time as %H:%M:%S */
412 the_time:
413 strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr);
414 break;
415
416 case 'u':
417 /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */
418 sprintf(tbuf, "%d", timeptr->tm_wday == 0 ? 7 :
419 timeptr->tm_wday);
420 break;
421
422 case 'U': /* week of year, Sunday is first day of week */
423 sprintf(tbuf, "%02d", weeknumber(timeptr, 0));
424 break;
425
426 case 'V': /* week of year according ISO 8601 */
427 sprintf(tbuf, "%02d", iso8601wknum(timeptr));
428 break;
429
430 case 'w': /* weekday, Sunday == 0, 0 - 6 */
431 i = range(0, timeptr->tm_wday, 6);
432 sprintf(tbuf, "%d", i);
433 break;
434
435 case 'W': /* week of year, Monday is first day of week */
436 sprintf(tbuf, "%02d", weeknumber(timeptr, 1));
437 break;
438
439 case 'x': /* appropriate date representation */
440 strftime(tbuf, sizeof tbuf, "%A %B %d %Y", timeptr);
441 break;
442
443 case 'X': /* appropriate time representation */
444 goto the_time;
445 break;
446
447 case 'y': /* year without a century, 00 - 99 */
448 year:
449 i = timeptr->tm_year % 100;
450 sprintf(tbuf, "%02d", i);
451 break;
452
453 case 'Y': /* year with century */
454 fullyear:
455 sprintf(tbuf, "%d", 1900 + timeptr->tm_year);
456 break;
457
458 /*
459 * From: Chip Rosenthal <chip@chinacat.unicom.com>
460 * Date: Sun, 19 Mar 1995 00:33:29 -0600 (CST)
461 *
462 * Warning: the %z [code] is implemented by inspecting the
463 * timezone name conditional compile settings, and
464 * inferring a method to get timezone offsets. I've tried
465 * this code on a couple of machines, but I don't doubt
466 * there is some system out there that won't like it.
467 * Maybe the easiest thing to do would be to bracket this
468 * with an #ifdef that can turn it off. The %z feature
469 * would be an admittedly obscure one that most folks can
470 * live without, but it would be a great help to those of
471 * us that muck around with various message processors.
472 */
473 case 'z': /* time zone offset east of GMT e.g. -0600 */
c184f645
CR		 474 if (timeptr->tm_isdst < 0)
475 break;
7117c2d2
JA		 476#ifdef HAVE_TM_NAME
477 /*
478 * Systems with tm_name probably have tm_tzadj as
479 * secs west of GMT. Convert to mins east of GMT.
480 */
481 off = -timeptr->tm_tzadj / 60;
482#else /* !HAVE_TM_NAME */
483#ifdef HAVE_TM_ZONE
484 /*
485 * Systems with tm_zone probably have tm_gmtoff as
486 * secs east of GMT. Convert to mins east of GMT.
487 */
488 off = timeptr->tm_gmtoff / 60;
489#else /* !HAVE_TM_ZONE */
490#if HAVE_TZNAME
491 /*
492 * Systems with tzname[] probably have timezone as
493 * secs west of GMT. Convert to mins east of GMT.
494 */
de3341d1
CR		 495# ifdef HPUX
496 off = -timezone / 60;
497# else
c184f645 498 off = -(daylight ? altzone : timezone) / 60;
de3341d1 499# endif /* !HPUX */
7117c2d2 500#else /* !HAVE_TZNAME */
de3341d1 501 gettimeofday(& tv, & zone);
7117c2d2
JA		 502 off = -zone.tz_minuteswest;
503#endif /* !HAVE_TZNAME */
504#endif /* !HAVE_TM_ZONE */
505#endif /* !HAVE_TM_NAME */
506 if (off < 0) {
507 tbuf[0] = '-';
508 off = -off;
509 } else {
510 tbuf[0] = '+';
511 }
512 sprintf(tbuf+1, "%02d%02d", off/60, off%60);
513 break;
514
515 case 'Z': /* time zone name or abbrevation */
516#ifdef HAVE_TZNAME
517 i = (daylight && timeptr->tm_isdst > 0); /* 0 or 1 */
518 strcpy(tbuf, tzname[i]);
519#else
520#ifdef HAVE_TM_ZONE
521 strcpy(tbuf, timeptr->tm_zone);
522#else
523#ifdef HAVE_TM_NAME
524 strcpy(tbuf, timeptr->tm_name);
525#else
526 gettimeofday(& tv, & zone);
527 strcpy(tbuf, timezone(zone.tz_minuteswest,
528 timeptr->tm_isdst > 0));
529#endif /* HAVE_TM_NAME */
530#endif /* HAVE_TM_ZONE */
531#endif /* HAVE_TZNAME */
532 break;
533
534#ifdef SUNOS_EXT
535 case 'k': /* hour, 24-hour clock, blank pad */
536 sprintf(tbuf, "%2d", range(0, timeptr->tm_hour, 23));
537 break;
538
539 case 'l': /* hour, 12-hour clock, 1 - 12, blank pad */
540 i = range(0, timeptr->tm_hour, 23);
541 if (i == 0)
542 i = 12;
543 else if (i > 12)
544 i -= 12;
545 sprintf(tbuf, "%2d", i);
546 break;
547#endif
548
549#ifdef HPUX_EXT
550 case 'N': /* Emperor/Era name */
551 /* this is essentially the same as the century */
552 goto century; /* %C */
553
554 case 'o': /* Emperor/Era year */
555 goto year; /* %y */
556#endif /* HPUX_EXT */
557
558
559#ifdef VMS_EXT
560 case 'v': /* date as dd-bbb-YYYY */
561 sprintf(tbuf, "%2d-%3.3s-%4d",
562 range(1, timeptr->tm_mday, 31),
563 months_a[range(0, timeptr->tm_mon, 11)],
564 timeptr->tm_year + 1900);
565 for (i = 3; i < 6; i++)
566 if (islower(tbuf[i]))
567 tbuf[i] = toupper(tbuf[i]);
568 break;
569#endif
570
571 default:
572 tbuf[0] = '%';
573 tbuf[1] = *format;
574 tbuf[2] = '\0';
575 break;
576 }
577 i = strlen(tbuf);
578 if (i) {
579 if (s + i < endp - 1) {
580 strcpy(s, tbuf);
581 s += i;
582 } else
583 return 0;
584 }
585 }
586out:
587 if (s < endp && *format == '\0') {
588 *s = '\0';
589 return (s - start);
590 } else
591 return 0;
592}
593
594/* isleap --- is a year a leap year? */
595
596static int
597isleap(int year)
598{
599 return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
600}
601
602
603/* iso8601wknum --- compute week number according to ISO 8601 */
604
605static int
606iso8601wknum(const struct tm *timeptr)
607{
608 /*
609 * From 1003.2:
610 * If the week (Monday to Sunday) containing January 1
611 * has four or more days in the new year, then it is week 1;
612 * otherwise it is the highest numbered week of the previous
613 * year (52 or 53), and the next week is week 1.
614 *
615 * ADR: This means if Jan 1 was Monday through Thursday,
616 * it was week 1, otherwise week 52 or 53.
617 *
618 * XPG4 erroneously included POSIX.2 rationale text in the
619 * main body of the standard. Thus it requires week 53.
620 */
621
622 int weeknum, jan1day, diff;
623
624 /* get week number, Monday as first day of the week */
625 weeknum = weeknumber(timeptr, 1);
626
627 /*
628 * With thanks and tip of the hatlo to tml@tik.vtt.fi
629 *
630 * What day of the week does January 1 fall on?
631 * We know that
632 * (timeptr->tm_yday - jan1.tm_yday) MOD 7 ==
633 * (timeptr->tm_wday - jan1.tm_wday) MOD 7
634 * and that
635 * jan1.tm_yday == 0
636 * and that
637 * timeptr->tm_wday MOD 7 == timeptr->tm_wday
638 * from which it follows that. . .
639 */
640 jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7);
641 if (jan1day < 0)
642 jan1day += 7;
643
644 /*
645 * If Jan 1 was a Monday through Thursday, it was in
646 * week 1. Otherwise it was last year's highest week, which is
647 * this year's week 0.
648 *
649 * What does that mean?
650 * If Jan 1 was Monday, the week number is exactly right, it can
651 * never be 0.
652 * If it was Tuesday through Thursday, the weeknumber is one
653 * less than it should be, so we add one.
654 * Otherwise, Friday, Saturday or Sunday, the week number is
655 * OK, but if it is 0, it needs to be 52 or 53.
656 */
657 switch (jan1day) {
658 case 1: /* Monday */
659 break;
660 case 2: /* Tuesday */
661 case 3: /* Wednesday */
662 case 4: /* Thursday */
663 weeknum++;
664 break;
665 case 5: /* Friday */
666 case 6: /* Saturday */
667 case 0: /* Sunday */
668 if (weeknum == 0) {
669#ifdef USE_BROKEN_XPG4
670 /* XPG4 (as of March 1994) says 53 unconditionally */
671 weeknum = 53;
672#else
673 /* get week number of last week of last year */
674 struct tm dec31ly; /* 12/31 last year */
675 dec31ly = *timeptr;
676 dec31ly.tm_year--;
677 dec31ly.tm_mon = 11;
678 dec31ly.tm_mday = 31;
679 dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1;
680 dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900);
681 weeknum = iso8601wknum(& dec31ly);
682#endif
683 }
684 break;
685 }
686
687 if (timeptr->tm_mon == 11) {
688 /*
689 * The last week of the year
690 * can be in week 1 of next year.
691 * Sigh.
692 *
693 * This can only happen if
694 * M T W
695 * 29 30 31
696 * 30 31
697 * 31
698 */
699 int wday, mday;
700
701 wday = timeptr->tm_wday;
702 mday = timeptr->tm_mday;
703 if ( (wday == 1 && (mday >= 29 && mday <= 31))
704 || (wday == 2 && (mday == 30 || mday == 31))
705 || (wday == 3 && mday == 31))
706 weeknum = 1;
707 }
708
709 return weeknum;
710}
711
712/* weeknumber --- figure how many weeks into the year */
713
714/* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */
715
716static int
717weeknumber(const struct tm *timeptr, int firstweekday)
718{
719 int wday = timeptr->tm_wday;
720 int ret;
721
722 if (firstweekday == 1) {
723 if (wday == 0) /* sunday */
724 wday = 6;
725 else
726 wday--;
727 }
728 ret = ((timeptr->tm_yday + 7 - wday) / 7);
729 if (ret < 0)
730 ret = 0;
731 return ret;
732}
733
734#if 0
735/* ADR --- I'm loathe to mess with ado's code ... */
736
737Date: Wed, 24 Apr 91 20:54:08 MDT
738From: Michal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK>
739To: arnold@audiofax.com
740
741Hi Arnold,
742in a process of fixing of strftime() in libraries on Atari ST I grabbed
743some pieces of code from your own strftime. When doing that it came
744to mind that your weeknumber() function compiles a little bit nicer
745in the following form:
746/*
747 * firstweekday is 0 if starting in Sunday, non-zero if in Monday
748 */
749{
750 return (timeptr->tm_yday - timeptr->tm_wday +
751 (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7;
752}
753How nicer it depends on a compiler, of course, but always a tiny bit.
754
755 Cheers,
756 Michal
757 ntomczak@vm.ucs.ualberta.ca
758#endif
759
760#ifdef TEST_STRFTIME
761
762/*
763 * NAME:
764 * tst
765 *
766 * SYNOPSIS:
767 * tst
768 *
769 * DESCRIPTION:
770 * "tst" is a test driver for the function "strftime".
771 *
772 * OPTIONS:
773 * None.
774 *
775 * AUTHOR:
776 * Karl Vogel
777 * Control Data Systems, Inc.
778 * vogelke@c-17igp.wpafb.af.mil
779 *
780 * BUGS:
781 * None noticed yet.
782 *
783 * COMPILE:
784 * cc -o tst -DTEST_STRFTIME strftime.c
785 */
786
787/* ADR: I reformatted this to my liking, and deleted some unneeded code. */
788
789#ifndef NULL
790#include <stdio.h>
791#endif
792#include <sys/time.h>
793#include <string.h>
794
795#define MAXTIME 132
796
797/*
798 * Array of time formats.
799 */
800
801static char *array[] =
802{
803 "(%%A) full weekday name, var length (Sunday..Saturday) %A",
804 "(%%B) full month name, var length (January..December) %B",
805 "(%%C) Century %C",
806 "(%%D) date (%%m/%%d/%%y) %D",
807 "(%%E) Locale extensions (ignored) %E",
808 "(%%F) full month name, var length (January..December) %F",
809 "(%%H) hour (24-hour clock, 00..23) %H",
810 "(%%I) hour (12-hour clock, 01..12) %I",
811 "(%%M) minute (00..59) %M",
812 "(%%N) Emporer/Era Name %N",
813 "(%%O) Locale extensions (ignored) %O",
814 "(%%R) time, 24-hour (%%H:%%M) %R",
815 "(%%S) second (00..60) %S",
816 "(%%T) time, 24-hour (%%H:%%M:%%S) %T",
817 "(%%U) week of year, Sunday as first day of week (00..53) %U",
818 "(%%V) week of year according to ISO 8601 %V",
819 "(%%W) week of year, Monday as first day of week (00..53) %W",
820 "(%%X) appropriate locale time representation (%H:%M:%S) %X",
821 "(%%Y) year with century (1970...) %Y",
822 "(%%Z) timezone (EDT), or blank if timezone not determinable %Z",
823 "(%%a) locale's abbreviated weekday name (Sun..Sat) %a",
824 "(%%b) locale's abbreviated month name (Jan..Dec) %b",
825 "(%%c) full date (Sat Nov 4 12:02:33 1989)%n%t%t%t %c",
826 "(%%d) day of the month (01..31) %d",
827 "(%%e) day of the month, blank-padded ( 1..31) %e",
828 "(%%h) should be same as (%%b) %h",
829 "(%%j) day of the year (001..366) %j",
830 "(%%k) hour, 24-hour clock, blank pad ( 0..23) %k",
831 "(%%l) hour, 12-hour clock, blank pad ( 0..12) %l",
832 "(%%m) month (01..12) %m",
833 "(%%o) Emporer/Era Year %o",
834 "(%%p) locale's AM or PM based on 12-hour clock %p",
835 "(%%r) time, 12-hour (same as %%I:%%M:%%S %%p) %r",
836 "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7] %u",
837 "(%%v) VMS date (dd-bbb-YYYY) %v",
838 "(%%w) day of week (0..6, Sunday == 0) %w",
839 "(%%x) appropriate locale date representation %x",
840 "(%%y) last two digits of year (00..99) %y",
841 "(%%z) timezone offset east of GMT as HHMM (e.g. -0500) %z",
842 (char *) NULL
843};
844
845/* main routine. */
846
847int
848main(argc, argv)
849int argc;
850char **argv;
851{
852 long time();
853
854 char *next;
855 char string[MAXTIME];
856
857 int k;
858 int length;
859
860 struct tm *tm;
861
862 long clock;
863
864 /* Call the function. */
865
866 clock = time((long *) 0);
867 tm = localtime(&clock);
868
869 for (k = 0; next = array[k]; k++) {
870 length = strftime(string, MAXTIME, next, tm);
871 printf("%s\n", string);
872 }
873
874 exit(0);
875}
876#endif /* TEST_STRFTIME */
Unnamed repository; edit this file 'description' to name the repository.