Source

xemacs-beta / src / strftime.c

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
/* strftime - custom formatting of date and/or time
   Copyright (C) 1989, 1991, 1992 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; see the file COPYING.  If not, write to
   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* Synched up with: FSF 19.30. */

/* Note: this version of strftime lacks locale support,
   but it is standalone.

   Performs `%' substitutions similar to those in printf.  Except
   where noted, substituted fields have a fixed size; numeric fields are
   padded if necessary.  Padding is with zeros by default; for fields
   that display a single number, padding can be changed or inhibited by
   following the `%' with one of the modifiers described below.  Unknown
   field specifiers are copied as normal characters.  All other
   characters are copied to the output without change.

   Supports a superset of the ANSI C field specifiers.

   Literal character fields:
   %	%
   n	newline
   t	tab

   Numeric modifiers (a nonstandard extension):
   -	do not pad the field
   _	pad the field with spaces

   Time fields:
   %H	hour (00..23)
   %I	hour (01..12)
   %k	hour ( 0..23)
   %l	hour ( 1..12)
   %M	minute (00..59)
   %p	locale's AM or PM
   %r	time, 12-hour (hh:mm:ss [AP]M)
   %R	time, 24-hour (hh:mm)
   %s	time in seconds since 00:00:00, Jan 1, 1970 (a nonstandard extension)
   %S	second (00..61)
   %T	time, 24-hour (hh:mm:ss)
   %X	locale's time representation (%H:%M:%S)
   %Z	time zone (EDT), or nothing if no time zone is determinable

   Date fields:
   %a	locale's abbreviated weekday name (Sun..Sat)
   %A	locale's full weekday name, variable length (Sunday..Saturday)
   %b	locale's abbreviated month name (Jan..Dec)
   %B	locale's full month name, variable length (January..December)
   %c	locale's date and time (Sat Nov 04 12:02:33 EST 1989)
   %C	century (00..99)
   %d	day of month (01..31)
   %e	day of month ( 1..31)
   %D	date (mm/dd/yy)
   %h	same as %b
   %j	day of year (001..366)
   %m	month (01..12)
   %U	week number of year with Sunday as first day of week (00..53)
   %w	day of week (0..6)
   %W	week number of year with Monday as first day of week (00..53)
   %x	locale's date representation (mm/dd/yy)
   %y	last two digits of year (00..99)
   %Y	year (1970...)

   David MacKenzie <djm@gnu.ai.mit.edu> */

#ifdef HAVE_CONFIG_H
#include <config.h>
#include "lisp.h"
#endif

#include <stdio.h>
#include <sys/types.h>
#if defined(TM_IN_SYS_TIME) || (!defined(HAVE_TM_ZONE) && !defined(HAVE_TZNAME))
#include <sys/time.h>
#else
#include <time.h>
#endif

#ifndef STDC_HEADERS
time_t mktime ();
#endif

#if defined(WINDOWSNT)
#include <time.h>
#else
#if defined(HAVE_TZNAME)
extern char *tzname[2];
#endif
#endif /* WINDOWSNT */

#ifdef emacs
#define strftime emacs_strftime
#endif

/* Types of padding for numbers in date and time. */
enum padding
{
  none, blank, zero
};

static char CONST* CONST days[] =
{
  "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
};

static char CONST * CONST months[] =
{
  "January", "February", "March", "April", "May", "June",
  "July", "August", "September", "October", "November", "December"
};

/* Add character C to STRING and increment LENGTH,
   unless LENGTH would exceed MAX. */

#define add_char(c) do		\
{				\
  if (length + 1 <= max)	\
    string[length++] = (c);	\
} while (0)

/* Add a 2 digit number to STRING, padding if specified.
   Return the number of characters added, up to MAX. */

static int
add_num2 (char *string, int num, int max, enum padding pad)
{
  int top = num / 10;
  int length = 0;

  if (top == 0 && pad == blank)
    add_char (' ');
  else if (top != 0 || pad == zero)
    add_char (top + '0');
  add_char (num % 10 + '0');
  return length;
}

/* Add a 3 digit number to STRING, padding if specified.
   Return the number of characters added, up to MAX. */

static int
add_num3 (char *string, int num, int max, enum padding pad)
{
  int top = num / 100;
  int mid = (num - top * 100) / 10;
  int length = 0;

  if (top == 0 && pad == blank)
    add_char (' ');
  else if (top != 0 || pad == zero)
    add_char (top + '0');
  if (mid == 0 && top == 0 && pad == blank)
    add_char (' ');
  else if (mid != 0 || top != 0 || pad == zero)
    add_char (mid + '0');
  add_char (num % 10 + '0');
  return length;
}

/* Like strncpy except return the number of characters copied. */

static int
add_str (char *to, CONST char *from, int max)
{
  int i;

  for (i = 0; from[i] && i <= max; ++i)
    to[i] = from[i];
  return i;
}

static int
add_num_time_t (char *string, int max, time_t num)
{
  /* This buffer is large enough to hold the character representation
     (including the trailing NUL) of any unsigned decimal quantity
     whose binary representation fits in 128 bits.  */
  char buf[40];
  int length;

  if (sizeof (num) > 16)
    abort ();
  sprintf (buf, "%lu", (unsigned long) num);
  length = add_str (string, buf, max);
  return length;
}

/* Return the week in the year of the time in TM, with the weeks
   starting on Sundays. */

static int
sun_week (CONST struct tm *tm)
{
  int dl;

  /* Set `dl' to the day in the year of the last day of the week previous
     to the one containing the day specified in TM.  If the day specified
     in TM is in the first week of the year, `dl' will be negative or 0.
     Otherwise, calculate the number of complete weeks before our week
     (dl / 7) and add any partial week at the start of the year (dl % 7). */
  dl = tm->tm_yday - tm->tm_wday;
  return dl <= 0 ? 0 : dl / 7 + (dl % 7 != 0);
}

/* Return the week in the year of the time in TM, with the weeks
   starting on Mondays. */

static int
mon_week (CONST struct tm *tm)
{
  int dl, wday;

  if (tm->tm_wday == 0)
    wday = 6;
  else
    wday = tm->tm_wday - 1;
  dl = tm->tm_yday - wday;
  return dl <= 0 ? 0 : dl / 7 + (dl % 7 != 0);
}

#if !defined(HAVE_TM_ZONE) && !defined(HAVE_TZNAME)
char *
zone_name (struct tm *tp)
{
  char *timezone ();
  struct timeval tv;
  struct timezone tz;

  gettimeofday (&tv, &tz);
  return timezone (tz.tz_minuteswest, tp->tm_isdst);
}
#endif

/* Format the time given in TM according to FORMAT, and put the
   results in STRING.
   Return the number of characters (not including terminating null)
   that were put into STRING, or 0 if the length would have
   exceeded MAX. */

size_t strftime (char *string, size_t max, CONST char *format,
		 CONST struct tm *tm);

size_t
strftime (char *string, size_t max, CONST char *format, CONST struct tm *tm)
{
  enum padding pad;		/* Type of padding to apply. */
  size_t length = 0;		/* Characters put in STRING so far. */

  for (; *format && length < max; ++format)
    {
      if (*format != '%')
	add_char (*format);
      else
	{
	  ++format;
	  /* Modifiers: */
	  if (*format == '-')
	    {
	      pad = none;
	      ++format;
	    }
	  else if (*format == '_')
	    {
	      pad = blank;
	      ++format;
	    }
	  else
	    pad = zero;

	  switch (*format)
	    {
	      /* Literal character fields: */
	    case 0:
	    case '%':
	      add_char ('%');
	      break;
	    case 'n':
	      add_char ('\n');
	      break;
	    case 't':
	      add_char ('\t');
	      break;
	    default:
	      add_char (*format);
	      break;

	      /* Time fields: */
	    case 'H':
	    case 'k':
	      length +=
		add_num2 (&string[length], tm->tm_hour, max - length,
			  *format == 'H' ? pad : blank);
	      break;
	    case 'I':
	    case 'l':
	      {
		int hour12;

		if (tm->tm_hour == 0)
		  hour12 = 12;
		else if (tm->tm_hour > 12)
		  hour12 = tm->tm_hour - 12;
		else
		  hour12 = tm->tm_hour;
		length +=
		  add_num2 (&string[length], hour12, max - length,
			    *format == 'I' ? pad : blank);
	      }
	      break;
	    case 'M':
	      length +=
		add_num2 (&string[length], tm->tm_min, max - length, pad);
	      break;
	    case 'p':
	      if (tm->tm_hour < 12)
		add_char ('A');
	      else
		add_char ('P');
	      add_char ('M');
	      break;
	    case 'r':
	      length +=
		strftime (&string[length], max - length, "%I:%M:%S %p", tm);
	      break;
	    case 'R':
	      length +=
		strftime (&string[length], max - length, "%H:%M", tm);
	      break;

	    case 's':
	      {
		struct tm writable_tm;
		writable_tm = *tm;
		length += add_num_time_t (&string[length], max - length,
					  mktime (&writable_tm));
	      }
	      break;

	    case 'S':
	      length +=
		add_num2 (&string[length], tm->tm_sec, max - length, pad);
	      break;
	    case 'T':
	      length +=
		strftime (&string[length], max - length, "%H:%M:%S", tm);
	      break;
	    case 'X':
	      length +=
		strftime (&string[length], max - length, "%H:%M:%S", tm);
	      break;
	    case 'Z':
#ifdef HAVE_TM_ZONE
	      length += add_str (&string[length], tm->tm_zone, max - length);
#else
#ifdef HAVE_TZNAME
	      if (tm->tm_isdst && tzname[1] && *tzname[1])
		length += add_str (&string[length], tzname[1], max - length);
	      else
		length += add_str (&string[length], tzname[0], max - length);
#else
	      length += add_str (&string[length], zone_name (tm), max - length);
#endif
#endif
	      break;

	      /* Date fields: */
	    case 'a':
	      add_char (days[tm->tm_wday][0]);
	      add_char (days[tm->tm_wday][1]);
	      add_char (days[tm->tm_wday][2]);
	      break;
	    case 'A':
	      length +=
		add_str (&string[length], days[tm->tm_wday], max - length);
	      break;
	    case 'b':
	    case 'h':
	      add_char (months[tm->tm_mon][0]);
	      add_char (months[tm->tm_mon][1]);
	      add_char (months[tm->tm_mon][2]);
	      break;
	    case 'B':
	      length +=
		add_str (&string[length], months[tm->tm_mon], max - length);
	      break;
	    case 'c':
	      length +=
		strftime (&string[length], max - length,
			  "%a %b %d %H:%M:%S %Z %Y", tm);
	      break;
	    case 'C':
	      length +=
		add_num2 (&string[length], (tm->tm_year + 1900) / 100,
			  max - length, pad);
	      break;
	    case 'd':
	      length +=
		add_num2 (&string[length], tm->tm_mday, max - length, pad);
	      break;
	    case 'e':
	      length +=
		add_num2 (&string[length], tm->tm_mday, max - length, blank);
	      break;
	    case 'D':
	      length +=
		strftime (&string[length], max - length, "%m/%d/%y", tm);
	      break;
	    case 'j':
	      length +=
		add_num3 (&string[length], tm->tm_yday + 1, max - length, pad);
	      break;
	    case 'm':
	      length +=
		add_num2 (&string[length], tm->tm_mon + 1, max - length, pad);
	      break;
	    case 'U':
	      length +=
		add_num2 (&string[length], sun_week (tm), max - length, pad);
	      break;
	    case 'w':
	      add_char (tm->tm_wday + '0');
	      break;
	    case 'W':
	      length +=
		add_num2 (&string[length], mon_week (tm), max - length, pad);
	      break;
	    case 'x':
	      length +=
		strftime (&string[length], max - length, "%m/%d/%y", tm);
	      break;
	    case 'y':
	      length +=
		add_num2 (&string[length], tm->tm_year % 100,
			  max - length, pad);
	      break;
	    case 'Y':
	      add_char ((tm->tm_year + 1900) / 1000 + '0');
	      length +=
		add_num3 (&string[length],
			  (1900 + tm->tm_year) % 1000, max - length, zero);
	      break;
	    }
	}
    }
  add_char (0);
  return length - 1;
}
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.