source: git/src/strftime.c@ 76cf7f1

RELEASE/1.2 debug-ci debug-ci-sanitisers faster-cavernlog log-select main stereo-2025 walls-data walls-data-hanging-as-warning warn-only-for-hanging-survey
Last change on this file since 76cf7f1 was 44314a0, checked in by Olly Betts <olly@…>, 15 years ago

Fix compilation error with GCC

git-svn-id: ​file:///home/survex-svn/survex/trunk@3568 4b37db11-9a0c-4f06-9ece-9ab7cdaee568
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File size: 9.7 KB
Line 
1/*
2 * strftime.c
3 *
4 * Public-domain relatively quick-and-dirty implemenation of
5 * ANSI library routine for System V Unix systems.
6 *
7 * It's written in old-style C for maximal portability.
8 * However, since I'm used to prototypes, I've included them too.
9 *
10 * If you want stuff in the System V ascftime routine, add the SYSV_EXT define.
11 * For stuff needed to implement the P1003.2 date command, add POSIX2_DATE.
12 * For complete POSIX semantics, add POSIX_SEMANTICS.
13 *
14 * The code for %c, %x, and %X is my best guess as to what's "appropriate".
15 * This version ignores LOCALE information.
16 * It also doesn't worry about multi-byte characters.
17 * So there.
18 *
19 * Arnold Robbins
20 * January, February, March, 1991
21 * Updated March 1992
22 *
23 * Fixes from ado@elsie.nci.nih.gov
24 * February 1991
25 *
26 * Fixed compiler warnings from GCC
27 * Olly Betts 2005-01-12
28 *
29 * Fix memory leak if realloc() fails
30 * Olly Betts 2010-12-21
31 *
32 * Fix compilation error with GCC
33 * Olly Betts 2010-12-21
34 */
35
36#include <stdio.h>
37#include <ctype.h>
38#include <string.h>
39#include <time.h>
40#include <sys/types.h>
41
42#ifndef __STDC__
43#define const /**/
44
45extern void *malloc();
46extern void *realloc();
47extern void free();
48extern void tzset();
49extern char *strchr();
50extern char *getenv();
51static int weeknumber();
52#else
53#include <stdlib.h>
54extern void tzset(void);
55static int weeknumber(const struct tm *timeptr, int firstweekday);
56#endif
57
58#ifdef __GNUC__
59#define inline __inline__
60#else
61#define inline /**/
62#endif
63
64#define range(low, item, hi) max(low, min(item, hi))
65
66extern char *tzname[2];
67extern int daylight;
68
69#define SYSV_EXT 1 /* stuff in System V ascftime routine */
70#define POSIX2_DATE 1 /* stuff in Posix 1003.2 date command */
71#define VMS_EXT 1 /* include %V for VMS date format */
72#define POSIX_SEMANTICS 1 /* call tzset() if TZ changes */
73
74#if defined(POSIX2_DATE) && ! defined(SYSV_EXT)
75#define SYSV_EXT 1
76#endif
77
78/* min --- return minimum of two numbers */
79
80#ifndef __STDC__
81static inline int
82min(a, b)
83int a, b;
84#else
85static inline int
86min(int a, int b)
87#endif
88{
89 return (a < b ? a : b);
90}
91
92/* max --- return maximum of two numbers */
93
94#ifndef __STDC__
95static inline int
96max(a, b)
97int a, b;
98#else
99static inline int
100max(int a, int b)
101#endif
102{
103 return (a > b ? a : b);
104}
105
106/* strftime --- produce formatted time */
107
108#ifndef __STDC__
109size_t
110strftime(s, maxsize, format, timeptr)
111char *s;
112size_t maxsize;
113const char *format;
114const struct tm *timeptr;
115#else
116size_t
117strftime(char *s, size_t maxsize, const char *format, const struct tm *timeptr)
118#endif
119{
120 char *endp = s + maxsize;
121 char *start = s;
122 char tbuf[100];
123 int i;
124 static short first = 1;
125 static char *savetz = NULL;
126 static int savetzlen = 0;
127 char *tz;
128 int tzlen;
129
130 /* various tables, useful in North America */
131 static const char *days_a[] = {
132 "Sun", "Mon", "Tue", "Wed",
133 "Thu", "Fri", "Sat",
134 };
135 static const char *days_l[] = {
136 "Sunday", "Monday", "Tuesday", "Wednesday",
137 "Thursday", "Friday", "Saturday",
138 };
139 static const char *months_a[] = {
140 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
141 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
142 };
143 static const char *months_l[] = {
144 "January", "February", "March", "April",
145 "May", "June", "July", "August", "September",
146 "October", "November", "December",
147 };
148 static const char *ampm[] = { "AM", "PM", };
149
150 if (s == NULL || format == NULL || timeptr == NULL || maxsize == 0)
151 return 0;
152
153 if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize)
154 return 0;
155
156#ifndef POSIX_SEMANTICS
157 if (first) {
158 tzset();
159 first = 0;
160 }
161#else /* POSIX_SEMANTICS */
162 tz = getenv("TZ");
163 tzlen = strlen(tz);
164 if (first) {
165 if (tz != NULL) {
166 savetz = (char *) malloc(tzlen + 1);
167 if (savetz != NULL) {
168 savetzlen = tzlen + 1;
169 strcpy(savetz, tz);
170 }
171 }
172 tzset();
173 first = 0;
174 }
175 /* if we have a saved TZ, and it is different, recapture and reset */
176 if (tz && savetz && (tz[0] != savetz[0] || strcmp(tz, savetz) != 0)) {
177 i = strlen(tz) + 1;
178 if (i > savetzlen) {
179 char * newsavetz = (char *) realloc(savetz, i);
180 if (newsavetz) {
181 savetzlen = i;
182 strcpy(newsavetz, tz);
183 } else {
184 free(savetz);
185 }
186 savetz = newsavetz;
187 } else
188 strcpy(savetz, tz);
189 tzset();
190 }
191#endif /* POSIX_SEMANTICS */
192
193 for (; *format && s < endp - 1; format++) {
194 tbuf[0] = '\0';
195 if (*format != '%') {
196 *s++ = *format;
197 continue;
198 }
199 again:
200 switch (*++format) {
201 case '\0':
202 *s++ = '%';
203 goto out;
204
205 case '%':
206 *s++ = '%';
207 continue;
208
209 case 'a': /* abbreviated weekday name */
210 if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6)
211 strcpy(tbuf, "?");
212 else
213 strcpy(tbuf, days_a[timeptr->tm_wday]);
214 break;
215
216 case 'A': /* full weekday name */
217 if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6)
218 strcpy(tbuf, "?");
219 else
220 strcpy(tbuf, days_l[timeptr->tm_wday]);
221 break;
222
223#ifdef SYSV_EXT
224 case 'h': /* abbreviated month name */
225#endif
226 case 'b': /* abbreviated month name */
227 if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11)
228 strcpy(tbuf, "?");
229 else
230 strcpy(tbuf, months_a[timeptr->tm_mon]);
231 break;
232
233 case 'B': /* full month name */
234 if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11)
235 strcpy(tbuf, "?");
236 else
237 strcpy(tbuf, months_l[timeptr->tm_mon]);
238 break;
239
240 case 'c': /* appropriate date and time representation */
241 sprintf(tbuf, "%s %s %2d %02d:%02d:%02d %d",
242 days_a[range(0, timeptr->tm_wday, 6)],
243 months_a[range(0, timeptr->tm_mon, 11)],
244 range(1, timeptr->tm_mday, 31),
245 range(0, timeptr->tm_hour, 23),
246 range(0, timeptr->tm_min, 59),
247 range(0, timeptr->tm_sec, 61),
248 timeptr->tm_year + 1900);
249 break;
250
251 case 'd': /* day of the month, 01 - 31 */
252 i = range(1, timeptr->tm_mday, 31);
253 sprintf(tbuf, "%02d", i);
254 break;
255
256 case 'H': /* hour, 24-hour clock, 00 - 23 */
257 i = range(0, timeptr->tm_hour, 23);
258 sprintf(tbuf, "%02d", i);
259 break;
260
261 case 'I': /* hour, 12-hour clock, 01 - 12 */
262 i = range(0, timeptr->tm_hour, 23);
263 if (i == 0)
264 i = 12;
265 else if (i > 12)
266 i -= 12;
267 sprintf(tbuf, "%02d", i);
268 break;
269
270 case 'j': /* day of the year, 001 - 366 */
271 sprintf(tbuf, "%03d", timeptr->tm_yday + 1);
272 break;
273
274 case 'm': /* month, 01 - 12 */
275 i = range(0, timeptr->tm_mon, 11);
276 sprintf(tbuf, "%02d", i + 1);
277 break;
278
279 case 'M': /* minute, 00 - 59 */
280 i = range(0, timeptr->tm_min, 59);
281 sprintf(tbuf, "%02d", i);
282 break;
283
284 case 'p': /* am or pm based on 12-hour clock */
285 i = range(0, timeptr->tm_hour, 23);
286 if (i < 12)
287 strcpy(tbuf, ampm[0]);
288 else
289 strcpy(tbuf, ampm[1]);
290 break;
291
292 case 'S': /* second, 00 - 61 */
293 i = range(0, timeptr->tm_sec, 61);
294 sprintf(tbuf, "%02d", i);
295 break;
296
297 case 'U': /* week of year, Sunday is first day of week */
298 sprintf(tbuf, "%d", weeknumber(timeptr, 0));
299 break;
300
301 case 'w': /* weekday, Sunday == 0, 0 - 6 */
302 i = range(0, timeptr->tm_wday, 6);
303 sprintf(tbuf, "%d", i);
304 break;
305
306 case 'W': /* week of year, Monday is first day of week */
307 sprintf(tbuf, "%d", weeknumber(timeptr, 1));
308 break;
309
310 case 'x': /* appropriate date representation */
311 sprintf(tbuf, "%s %s %2d %d",
312 days_a[range(0, timeptr->tm_wday, 6)],
313 months_a[range(0, timeptr->tm_mon, 11)],
314 range(1, timeptr->tm_mday, 31),
315 timeptr->tm_year + 1900);
316 break;
317
318 case 'X': /* appropriate time representation */
319 sprintf(tbuf, "%02d:%02d:%02d",
320 range(0, timeptr->tm_hour, 23),
321 range(0, timeptr->tm_min, 59),
322 range(0, timeptr->tm_sec, 61));
323 break;
324
325 case 'y': /* year without a century, 00 - 99 */
326 i = timeptr->tm_year % 100;
327 sprintf(tbuf, "%d", i);
328 break;
329
330 case 'Y': /* year with century */
331 sprintf(tbuf, "%d", 1900 + timeptr->tm_year);
332 break;
333
334 case 'Z': /* time zone name or abbrevation */
335 i = 0;
336 if (daylight && timeptr->tm_isdst)
337 i = 1;
338 strcpy(tbuf, tzname[i]);
339 break;
340
341#ifdef SYSV_EXT
342 case 'n': /* same as \n */
343 tbuf[0] = '\n';
344 tbuf[1] = '\0';
345 break;
346
347 case 't': /* same as \t */
348 tbuf[0] = '\t';
349 tbuf[1] = '\0';
350 break;
351
352 case 'D': /* date as %m/%d/%y */
353 strftime(tbuf, sizeof tbuf, "%m/%d/%y", timeptr);
354 break;
355
356 case 'e': /* day of month, blank padded */
357 sprintf(tbuf, "%2d", range(1, timeptr->tm_mday, 31));
358 break;
359
360 case 'r': /* time as %I:%M:%S %p */
361 strftime(tbuf, sizeof tbuf, "%I:%M:%S %p", timeptr);
362 break;
363
364 case 'R': /* time as %H:%M */
365 strftime(tbuf, sizeof tbuf, "%H:%M", timeptr);
366 break;
367
368 case 'T': /* time as %H:%M:%S */
369 strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr);
370 break;
371#endif
372
373
374#ifdef VMS_EXT
375 case 'V': /* date as dd-bbb-YYYY */
376 sprintf(tbuf, "%2d-%3.3s-%4d",
377 range(1, timeptr->tm_mday, 31),
378 months_a[range(0, timeptr->tm_mon, 11)],
379 timeptr->tm_year + 1900);
380 for (i = 3; i < 6; i++)
381 if (islower(tbuf[i]))
382 tbuf[i] = toupper(tbuf[i]);
383 break;
384#endif
385
386
387#ifdef POSIX2_DATE
388 case 'C':
389 sprintf(tbuf, "%02d", (timeptr->tm_year + 1900) / 100);
390 break;
391
392
393 case 'E':
394 case 'O':
395 /* POSIX locale extensions, ignored for now */
396 goto again;
397#endif
398 default:
399 tbuf[0] = '%';
400 tbuf[1] = *format;
401 tbuf[2] = '\0';
402 break;
403 }
404 i = strlen(tbuf);
405 if (i) {
406 if (s + i < endp - 1) {
407 strcpy(s, tbuf);
408 s += i;
409 } else
410 return 0;
411 }
412 }
413out:
414 if (s < endp && *format == '\0') {
415 *s = '\0';
416 return (s - start);
417 } else
418 return 0;
419}
420
421/* weeknumber --- figure how many weeks into the year */
422
423/* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */
424/* Modified byMichal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK> */
425
426#ifndef __STDC__
427static int
428weeknumber(timeptr, firstweekday)
429const struct tm *timeptr;
430int firstweekday;
431#else
432static int
433weeknumber(const struct tm *timeptr, int firstweekday)
434#endif
435/*
436 * firstweekday is 0 if starting in Sunday, non-zero if in Monday
437 */
438{
439 return (timeptr->tm_yday - timeptr->tm_wday +
440 (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7;
441}
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