|
428
|
1 /* strftime - custom formatting of date and/or time
|
|
|
2 Copyright (C) 1989, 1991, 1992 Free Software Foundation, Inc.
|
|
|
3
|
|
|
4 This program is free software; you can redistribute it and/or modify
|
|
|
5 it under the terms of the GNU General Public License as published by
|
|
|
6 the Free Software Foundation; either version 2, or (at your option)
|
|
|
7 any later version.
|
|
|
8
|
|
|
9 This program is distributed in the hope that it will be useful,
|
|
|
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
12 GNU General Public License for more details.
|
|
|
13
|
|
|
14 You should have received a copy of the GNU General Public License
|
|
|
15 along with this program; see the file COPYING. If not, write to
|
|
|
16 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
|
17 Boston, MA 02111-1307, USA. */
|
|
|
18
|
|
|
19 /* Synched up with: FSF 19.30. */
|
|
|
20
|
|
771
|
21 /* This file has been ... uhhhhh ... Mule-ized. Yeah.
|
|
|
22
|
|
|
23 (Everything here is external format. This is DANGEROUS and
|
|
|
24 data-lossy, but fixing it is too much of a bother now.) --ben */
|
|
|
25
|
|
428
|
26 /* Note: this version of strftime lacks locale support,
|
|
|
27 but it is standalone.
|
|
|
28
|
|
|
29 Performs `%' substitutions similar to those in printf. Except
|
|
|
30 where noted, substituted fields have a fixed size; numeric fields are
|
|
|
31 padded if necessary. Padding is with zeros by default; for fields
|
|
|
32 that display a single number, padding can be changed or inhibited by
|
|
|
33 following the `%' with one of the modifiers described below. Unknown
|
|
|
34 field specifiers are copied as normal characters. All other
|
|
|
35 characters are copied to the output without change.
|
|
|
36
|
|
|
37 Supports a superset of the ANSI C field specifiers.
|
|
|
38
|
|
|
39 Literal character fields:
|
|
|
40 % %
|
|
|
41 n newline
|
|
|
42 t tab
|
|
|
43
|
|
|
44 Numeric modifiers (a nonstandard extension):
|
|
|
45 - do not pad the field
|
|
|
46 _ pad the field with spaces
|
|
|
47
|
|
|
48 Time fields:
|
|
|
49 %H hour (00..23)
|
|
|
50 %I hour (01..12)
|
|
|
51 %k hour ( 0..23)
|
|
|
52 %l hour ( 1..12)
|
|
|
53 %M minute (00..59)
|
|
|
54 %p locale's AM or PM
|
|
|
55 %r time, 12-hour (hh:mm:ss [AP]M)
|
|
|
56 %R time, 24-hour (hh:mm)
|
|
|
57 %s time in seconds since 00:00:00, Jan 1, 1970 (a nonstandard extension)
|
|
|
58 %S second (00..61)
|
|
|
59 %T time, 24-hour (hh:mm:ss)
|
|
|
60 %X locale's time representation (%H:%M:%S)
|
|
|
61 %Z time zone (EDT), or nothing if no time zone is determinable
|
|
|
62
|
|
|
63 Date fields:
|
|
|
64 %a locale's abbreviated weekday name (Sun..Sat)
|
|
|
65 %A locale's full weekday name, variable length (Sunday..Saturday)
|
|
|
66 %b locale's abbreviated month name (Jan..Dec)
|
|
|
67 %B locale's full month name, variable length (January..December)
|
|
|
68 %c locale's date and time (Sat Nov 04 12:02:33 EST 1989)
|
|
|
69 %C century (00..99)
|
|
|
70 %d day of month (01..31)
|
|
|
71 %e day of month ( 1..31)
|
|
|
72 %D date (mm/dd/yy)
|
|
|
73 %h same as %b
|
|
|
74 %j day of year (001..366)
|
|
|
75 %m month (01..12)
|
|
|
76 %U week number of year with Sunday as first day of week (00..53)
|
|
|
77 %w day of week (0..6)
|
|
|
78 %W week number of year with Monday as first day of week (00..53)
|
|
|
79 %x locale's date representation (mm/dd/yy)
|
|
|
80 %y last two digits of year (00..99)
|
|
|
81 %Y year (1970...)
|
|
|
82
|
|
|
83 David MacKenzie <djm@gnu.ai.mit.edu> */
|
|
|
84
|
|
|
85 #ifdef HAVE_CONFIG_H
|
|
|
86 #include <config.h>
|
|
|
87 #include "lisp.h"
|
|
|
88 #endif
|
|
|
89
|
|
|
90 #include <stdio.h>
|
|
|
91 #include <sys/types.h>
|
|
|
92 #if defined(TM_IN_SYS_TIME) || (!defined(HAVE_TM_ZONE) && !defined(HAVE_TZNAME))
|
|
|
93 #include <sys/time.h>
|
|
|
94 #else
|
|
|
95 #include <time.h>
|
|
|
96 #endif
|
|
|
97
|
|
|
98 #ifndef STDC_HEADERS
|
|
|
99 time_t mktime ();
|
|
|
100 #endif
|
|
|
101
|
|
442
|
102 #if defined(WIN32_NATIVE) || defined(CYGWIN)
|
|
428
|
103 #include <time.h>
|
|
|
104 #else
|
|
|
105 #if defined(HAVE_TZNAME)
|
|
|
106 extern char *tzname[2];
|
|
|
107 #endif
|
|
442
|
108 #endif /* WIN32_NATIVE */
|
|
428
|
109
|
|
|
110 #ifdef emacs
|
|
|
111 #define strftime emacs_strftime
|
|
|
112 #endif
|
|
|
113
|
|
|
114 /* Types of padding for numbers in date and time. */
|
|
|
115 enum padding
|
|
|
116 {
|
|
|
117 none, blank, zero
|
|
|
118 };
|
|
|
119
|
|
442
|
120 static char const* const days[] =
|
|
428
|
121 {
|
|
|
122 "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
|
|
|
123 };
|
|
|
124
|
|
442
|
125 static char const * const months[] =
|
|
428
|
126 {
|
|
|
127 "January", "February", "March", "April", "May", "June",
|
|
|
128 "July", "August", "September", "October", "November", "December"
|
|
|
129 };
|
|
|
130
|
|
|
131 /* Add character C to STRING and increment LENGTH,
|
|
|
132 unless LENGTH would exceed MAX. */
|
|
|
133
|
|
|
134 #define add_char(c) do \
|
|
|
135 { \
|
|
|
136 if (length + 1 <= max) \
|
|
|
137 string[length++] = (c); \
|
|
|
138 } while (0)
|
|
|
139
|
|
|
140 /* Add a 2 digit number to STRING, padding if specified.
|
|
|
141 Return the number of characters added, up to MAX. */
|
|
|
142
|
|
|
143 static int
|
|
|
144 add_num2 (char *string, int num, int max, enum padding pad)
|
|
|
145 {
|
|
|
146 int top = num / 10;
|
|
|
147 int length = 0;
|
|
|
148
|
|
|
149 if (top == 0 && pad == blank)
|
|
|
150 add_char (' ');
|
|
|
151 else if (top != 0 || pad == zero)
|
|
|
152 add_char (top + '0');
|
|
|
153 add_char (num % 10 + '0');
|
|
|
154 return length;
|
|
|
155 }
|
|
|
156
|
|
|
157 /* Add a 3 digit number to STRING, padding if specified.
|
|
|
158 Return the number of characters added, up to MAX. */
|
|
|
159
|
|
|
160 static int
|
|
|
161 add_num3 (char *string, int num, int max, enum padding pad)
|
|
|
162 {
|
|
|
163 int top = num / 100;
|
|
|
164 int mid = (num - top * 100) / 10;
|
|
|
165 int length = 0;
|
|
|
166
|
|
|
167 if (top == 0 && pad == blank)
|
|
|
168 add_char (' ');
|
|
|
169 else if (top != 0 || pad == zero)
|
|
|
170 add_char (top + '0');
|
|
|
171 if (mid == 0 && top == 0 && pad == blank)
|
|
|
172 add_char (' ');
|
|
|
173 else if (mid != 0 || top != 0 || pad == zero)
|
|
|
174 add_char (mid + '0');
|
|
|
175 add_char (num % 10 + '0');
|
|
|
176 return length;
|
|
|
177 }
|
|
|
178
|
|
|
179 /* Like strncpy except return the number of characters copied. */
|
|
|
180
|
|
|
181 static int
|
|
442
|
182 add_str (char *to, const char *from, int max)
|
|
428
|
183 {
|
|
|
184 int i;
|
|
|
185
|
|
|
186 for (i = 0; from[i] && i <= max; ++i)
|
|
|
187 to[i] = from[i];
|
|
|
188 return i;
|
|
|
189 }
|
|
|
190
|
|
|
191 static int
|
|
|
192 add_num_time_t (char *string, int max, time_t num)
|
|
|
193 {
|
|
|
194 /* This buffer is large enough to hold the character representation
|
|
|
195 (including the trailing NUL) of any unsigned decimal quantity
|
|
|
196 whose binary representation fits in 128 bits. */
|
|
|
197 char buf[40];
|
|
|
198
|
|
|
199 if (sizeof (num) > 16)
|
|
2500
|
200 ABORT ();
|
|
428
|
201 sprintf (buf, "%lu", (unsigned long) num);
|
|
793
|
202 return add_str (string, buf, max);
|
|
428
|
203 }
|
|
|
204
|
|
|
205 /* Return the week in the year of the time in TM, with the weeks
|
|
|
206 starting on Sundays. */
|
|
|
207
|
|
|
208 static int
|
|
442
|
209 sun_week (const struct tm *tm)
|
|
428
|
210 {
|
|
|
211 int dl;
|
|
|
212
|
|
|
213 /* Set `dl' to the day in the year of the last day of the week previous
|
|
|
214 to the one containing the day specified in TM. If the day specified
|
|
|
215 in TM is in the first week of the year, `dl' will be negative or 0.
|
|
|
216 Otherwise, calculate the number of complete weeks before our week
|
|
|
217 (dl / 7) and add any partial week at the start of the year (dl % 7). */
|
|
|
218 dl = tm->tm_yday - tm->tm_wday;
|
|
|
219 return dl <= 0 ? 0 : dl / 7 + (dl % 7 != 0);
|
|
|
220 }
|
|
|
221
|
|
|
222 /* Return the week in the year of the time in TM, with the weeks
|
|
|
223 starting on Mondays. */
|
|
|
224
|
|
|
225 static int
|
|
442
|
226 mon_week (const struct tm *tm)
|
|
428
|
227 {
|
|
|
228 int dl, wday;
|
|
|
229
|
|
|
230 if (tm->tm_wday == 0)
|
|
|
231 wday = 6;
|
|
|
232 else
|
|
|
233 wday = tm->tm_wday - 1;
|
|
|
234 dl = tm->tm_yday - wday;
|
|
|
235 return dl <= 0 ? 0 : dl / 7 + (dl % 7 != 0);
|
|
|
236 }
|
|
|
237
|
|
|
238 #if !defined(HAVE_TM_ZONE) && !defined(HAVE_TZNAME)
|
|
442
|
239 char *zone_name (const struct tm *tp);
|
|
428
|
240 char *
|
|
442
|
241 zone_name (const struct tm *tp)
|
|
428
|
242 {
|
|
|
243 char *timezone ();
|
|
|
244 struct timeval tv;
|
|
|
245 struct timezone tz;
|
|
|
246
|
|
|
247 gettimeofday (&tv, &tz);
|
|
|
248 return timezone (tz.tz_minuteswest, tp->tm_isdst);
|
|
|
249 }
|
|
|
250 #endif
|
|
|
251
|
|
|
252 /* Format the time given in TM according to FORMAT, and put the
|
|
|
253 results in STRING.
|
|
|
254 Return the number of characters (not including terminating null)
|
|
|
255 that were put into STRING, or 0 if the length would have
|
|
|
256 exceeded MAX. */
|
|
|
257
|
|
442
|
258 size_t strftime (char *string, size_t max, const char *format,
|
|
|
259 const struct tm *tm);
|
|
428
|
260
|
|
|
261 size_t
|
|
442
|
262 strftime (char *string, size_t max, const char *format, const struct tm *tm)
|
|
428
|
263 {
|
|
|
264 enum padding pad; /* Type of padding to apply. */
|
|
|
265 size_t length = 0; /* Characters put in STRING so far. */
|
|
|
266
|
|
|
267 for (; *format && length < max; ++format)
|
|
|
268 {
|
|
|
269 if (*format != '%')
|
|
|
270 add_char (*format);
|
|
|
271 else
|
|
|
272 {
|
|
|
273 ++format;
|
|
|
274 /* Modifiers: */
|
|
|
275 if (*format == '-')
|
|
|
276 {
|
|
|
277 pad = none;
|
|
|
278 ++format;
|
|
|
279 }
|
|
|
280 else if (*format == '_')
|
|
|
281 {
|
|
|
282 pad = blank;
|
|
|
283 ++format;
|
|
|
284 }
|
|
|
285 else
|
|
|
286 pad = zero;
|
|
|
287
|
|
|
288 switch (*format)
|
|
|
289 {
|
|
|
290 /* Literal character fields: */
|
|
|
291 case 0:
|
|
|
292 case '%':
|
|
|
293 add_char ('%');
|
|
|
294 break;
|
|
|
295 case 'n':
|
|
|
296 add_char ('\n');
|
|
|
297 break;
|
|
|
298 case 't':
|
|
|
299 add_char ('\t');
|
|
|
300 break;
|
|
|
301 default:
|
|
|
302 add_char (*format);
|
|
|
303 break;
|
|
|
304
|
|
|
305 /* Time fields: */
|
|
|
306 case 'H':
|
|
|
307 case 'k':
|
|
|
308 length +=
|
|
|
309 add_num2 (&string[length], tm->tm_hour, max - length,
|
|
|
310 *format == 'H' ? pad : blank);
|
|
|
311 break;
|
|
|
312 case 'I':
|
|
|
313 case 'l':
|
|
|
314 {
|
|
|
315 int hour12;
|
|
|
316
|
|
|
317 if (tm->tm_hour == 0)
|
|
|
318 hour12 = 12;
|
|
|
319 else if (tm->tm_hour > 12)
|
|
|
320 hour12 = tm->tm_hour - 12;
|
|
|
321 else
|
|
|
322 hour12 = tm->tm_hour;
|
|
|
323 length +=
|
|
|
324 add_num2 (&string[length], hour12, max - length,
|
|
|
325 *format == 'I' ? pad : blank);
|
|
|
326 }
|
|
|
327 break;
|
|
|
328 case 'M':
|
|
|
329 length +=
|
|
|
330 add_num2 (&string[length], tm->tm_min, max - length, pad);
|
|
|
331 break;
|
|
|
332 case 'p':
|
|
|
333 if (tm->tm_hour < 12)
|
|
|
334 add_char ('A');
|
|
|
335 else
|
|
|
336 add_char ('P');
|
|
|
337 add_char ('M');
|
|
|
338 break;
|
|
|
339 case 'r':
|
|
|
340 length +=
|
|
|
341 strftime (&string[length], max - length, "%I:%M:%S %p", tm);
|
|
|
342 break;
|
|
|
343 case 'R':
|
|
|
344 length +=
|
|
|
345 strftime (&string[length], max - length, "%H:%M", tm);
|
|
|
346 break;
|
|
|
347
|
|
|
348 case 's':
|
|
|
349 {
|
|
|
350 struct tm writable_tm;
|
|
|
351 writable_tm = *tm;
|
|
|
352 length += add_num_time_t (&string[length], max - length,
|
|
|
353 mktime (&writable_tm));
|
|
|
354 }
|
|
|
355 break;
|
|
|
356
|
|
|
357 case 'S':
|
|
|
358 length +=
|
|
|
359 add_num2 (&string[length], tm->tm_sec, max - length, pad);
|
|
|
360 break;
|
|
|
361 case 'T':
|
|
|
362 length +=
|
|
|
363 strftime (&string[length], max - length, "%H:%M:%S", tm);
|
|
|
364 break;
|
|
|
365 case 'X':
|
|
|
366 length +=
|
|
|
367 strftime (&string[length], max - length, "%H:%M:%S", tm);
|
|
|
368 break;
|
|
|
369 case 'Z':
|
|
|
370 #ifdef HAVE_TM_ZONE
|
|
|
371 length += add_str (&string[length], tm->tm_zone, max - length);
|
|
|
372 #else
|
|
|
373 #ifdef HAVE_TZNAME
|
|
|
374 if (tm->tm_isdst && tzname[1] && *tzname[1])
|
|
|
375 length += add_str (&string[length], tzname[1], max - length);
|
|
|
376 else
|
|
|
377 length += add_str (&string[length], tzname[0], max - length);
|
|
|
378 #else
|
|
|
379 length += add_str (&string[length], zone_name (tm), max - length);
|
|
|
380 #endif
|
|
|
381 #endif
|
|
|
382 break;
|
|
|
383
|
|
|
384 /* Date fields: */
|
|
|
385 case 'a':
|
|
|
386 add_char (days[tm->tm_wday][0]);
|
|
|
387 add_char (days[tm->tm_wday][1]);
|
|
|
388 add_char (days[tm->tm_wday][2]);
|
|
|
389 break;
|
|
|
390 case 'A':
|
|
|
391 length +=
|
|
|
392 add_str (&string[length], days[tm->tm_wday], max - length);
|
|
|
393 break;
|
|
|
394 case 'b':
|
|
|
395 case 'h':
|
|
|
396 add_char (months[tm->tm_mon][0]);
|
|
|
397 add_char (months[tm->tm_mon][1]);
|
|
|
398 add_char (months[tm->tm_mon][2]);
|
|
|
399 break;
|
|
|
400 case 'B':
|
|
|
401 length +=
|
|
|
402 add_str (&string[length], months[tm->tm_mon], max - length);
|
|
|
403 break;
|
|
|
404 case 'c':
|
|
|
405 length +=
|
|
|
406 strftime (&string[length], max - length,
|
|
|
407 "%a %b %d %H:%M:%S %Z %Y", tm);
|
|
|
408 break;
|
|
|
409 case 'C':
|
|
|
410 length +=
|
|
|
411 add_num2 (&string[length], (tm->tm_year + 1900) / 100,
|
|
|
412 max - length, pad);
|
|
|
413 break;
|
|
|
414 case 'd':
|
|
|
415 length +=
|
|
|
416 add_num2 (&string[length], tm->tm_mday, max - length, pad);
|
|
|
417 break;
|
|
|
418 case 'e':
|
|
|
419 length +=
|
|
|
420 add_num2 (&string[length], tm->tm_mday, max - length, blank);
|
|
|
421 break;
|
|
|
422 case 'D':
|
|
|
423 length +=
|
|
|
424 strftime (&string[length], max - length, "%m/%d/%y", tm);
|
|
|
425 break;
|
|
|
426 case 'j':
|
|
|
427 length +=
|
|
|
428 add_num3 (&string[length], tm->tm_yday + 1, max - length, pad);
|
|
|
429 break;
|
|
|
430 case 'm':
|
|
|
431 length +=
|
|
|
432 add_num2 (&string[length], tm->tm_mon + 1, max - length, pad);
|
|
|
433 break;
|
|
|
434 case 'U':
|
|
|
435 length +=
|
|
|
436 add_num2 (&string[length], sun_week (tm), max - length, pad);
|
|
|
437 break;
|
|
|
438 case 'w':
|
|
|
439 add_char (tm->tm_wday + '0');
|
|
|
440 break;
|
|
|
441 case 'W':
|
|
|
442 length +=
|
|
|
443 add_num2 (&string[length], mon_week (tm), max - length, pad);
|
|
|
444 break;
|
|
|
445 case 'x':
|
|
|
446 length +=
|
|
|
447 strftime (&string[length], max - length, "%m/%d/%y", tm);
|
|
|
448 break;
|
|
|
449 case 'y':
|
|
|
450 length +=
|
|
|
451 add_num2 (&string[length], tm->tm_year % 100,
|
|
|
452 max - length, pad);
|
|
|
453 break;
|
|
|
454 case 'Y':
|
|
|
455 add_char ((tm->tm_year + 1900) / 1000 + '0');
|
|
|
456 length +=
|
|
|
457 add_num3 (&string[length],
|
|
|
458 (1900 + tm->tm_year) % 1000, max - length, zero);
|
|
|
459 break;
|
|
|
460 }
|
|
|
461 }
|
|
|
462 }
|
|
|
463 add_char (0);
|
|
|
464 return length - 1;
|
|
|
465 }
|
