1 #ifndef lint
2 #ifndef NOID
3 static char elsieid[] = "@(#)strftime.c 8.1";
4 /*
5 ** Based on the UCB version with the ID appearing below.
6 ** This is ANSIish only when "multibyte character == plain character".
7 */
8 #endif /* !defined NOID */
9 #endif /* !defined lint */
10
11 #include <stdio.h>
12 #include <time.h>
13 #include <tzfile.h>
14 #include <limits.h>
15 #include <cutils/tztime.h>
16
17 /*
18 ** Copyright (c) 1989 The Regents of the University of California.
19 ** All rights reserved.
20 **
21 ** Redistribution and use in source and binary forms are permitted
22 ** provided that the above copyright notice and this paragraph are
23 ** duplicated in all such forms and that any documentation,
24 ** advertising materials, and other materials related to such
25 ** distribution and use acknowledge that the software was developed
26 ** by the University of California, Berkeley. The name of the
27 ** University may not be used to endorse or promote products derived
28 ** from this software without specific prior written permission.
29 ** THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
30 ** IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
31 ** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
32 */
33
34 #ifndef LIBC_SCCS
35 #ifndef lint
36 static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89";
37 #endif /* !defined lint */
38 #endif /* !defined LIBC_SCCS */
39
40 #include <ctype.h>
41
42 #define P(x) x
43
44 static char * _add P((const char *, char *, const char *, int));
45 static char * _conv P((int, const char *, char *, const char *));
46 static char * _fmt P((const char *, const struct tm *, char *, const char *,
47 int *, const struct strftime_locale *Locale));
48 static char * _yconv P((int, int, int, int, char *, const char *, int));
49 static char * getformat P((int, char *, char *, char *, char *));
50
51 extern char * tzname[];
52
53
54
55
56
57 /* from private.h */
58
59 #ifndef TYPE_BIT
60 #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT)
61 #endif /* !defined TYPE_BIT */
62
63 #ifndef TYPE_SIGNED
64 #define TYPE_SIGNED(type) (((type) -1) < 0)
65 #endif /* !defined TYPE_SIGNED */
66
67 #ifndef INT_STRLEN_MAXIMUM
68 /*
69 * ** 302 / 1000 is log10(2.0) rounded up.
70 * ** Subtract one for the sign bit if the type is signed;
71 * ** add one for integer division truncation;
72 * ** add one more for a minus sign if the type is signed.
73 * */
74 #define INT_STRLEN_MAXIMUM(type) \
75 ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \
76 1 + TYPE_SIGNED(type))
77 #endif /* !defined INT_STRLEN_MAXIMUM */
78
79 /* end of part from private.h */
80
81
82
83
84 #ifndef YEAR_2000_NAME
85 #define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS"
86 #endif /* !defined YEAR_2000_NAME */
87
88 #define IN_NONE 0
89 #define IN_SOME 1
90 #define IN_THIS 2
91 #define IN_ALL 3
92
93 #define FORCE_LOWER_CASE 0x100
94
95 size_t
strftime_tz(s,maxsize,format,t,Locale)96 strftime_tz(s, maxsize, format, t, Locale)
97 char * const s;
98 const size_t maxsize;
99 const char * const format;
100 const struct tm * const t;
101 const struct strftime_locale *Locale;
102 {
103 char * p;
104 int warn;
105
106 warn = IN_NONE;
107 p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn, Locale);
108 #if 0
109 if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) {
110 (void) fprintf(stderr, "\n");
111 if (format == NULL)
112 (void) fprintf(stderr, "NULL strftime format ");
113 else (void) fprintf(stderr, "strftime format \"%s\" ",
114 format);
115 (void) fprintf(stderr, "yields only two digits of years in ");
116 if (warn == IN_SOME)
117 (void) fprintf(stderr, "some locales");
118 else if (warn == IN_THIS)
119 (void) fprintf(stderr, "the current locale");
120 else (void) fprintf(stderr, "all locales");
121 (void) fprintf(stderr, "\n");
122 }
123 #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */
124 if (p == s + maxsize)
125 return 0;
126 *p = '\0';
127 return p - s;
128 }
129
getformat(int modifier,char * normal,char * underscore,char * dash,char * zero)130 static char *getformat(int modifier, char *normal, char *underscore,
131 char *dash, char *zero) {
132 switch (modifier) {
133 case '_':
134 return underscore;
135
136 case '-':
137 return dash;
138
139 case '0':
140 return zero;
141 }
142
143 return normal;
144 }
145
146 static char *
_fmt(format,t,pt,ptlim,warnp,Locale)147 _fmt(format, t, pt, ptlim, warnp, Locale)
148 const char * format;
149 const struct tm * const t;
150 char * pt;
151 const char * const ptlim;
152 int * warnp;
153 const struct strftime_locale *Locale;
154 {
155 for ( ; *format; ++format) {
156 if (*format == '%') {
157 int modifier = 0;
158 label:
159 switch (*++format) {
160 case '\0':
161 --format;
162 break;
163 case 'A':
164 pt = _add((t->tm_wday < 0 ||
165 t->tm_wday >= DAYSPERWEEK) ?
166 "?" : Locale->weekday[t->tm_wday],
167 pt, ptlim, modifier);
168 continue;
169 case 'a':
170 pt = _add((t->tm_wday < 0 ||
171 t->tm_wday >= DAYSPERWEEK) ?
172 "?" : Locale->wday[t->tm_wday],
173 pt, ptlim, modifier);
174 continue;
175 case 'B':
176 if (modifier == '-') {
177 pt = _add((t->tm_mon < 0 ||
178 t->tm_mon >= MONSPERYEAR) ?
179 "?" : Locale->standalone_month[t->tm_mon],
180 pt, ptlim, modifier);
181 } else {
182 pt = _add((t->tm_mon < 0 ||
183 t->tm_mon >= MONSPERYEAR) ?
184 "?" : Locale->month[t->tm_mon],
185 pt, ptlim, modifier);
186 }
187 continue;
188 case 'b':
189 case 'h':
190 pt = _add((t->tm_mon < 0 ||
191 t->tm_mon >= MONSPERYEAR) ?
192 "?" : Locale->mon[t->tm_mon],
193 pt, ptlim, modifier);
194 continue;
195 case 'C':
196 /*
197 ** %C used to do a...
198 ** _fmt("%a %b %e %X %Y", t);
199 ** ...whereas now POSIX 1003.2 calls for
200 ** something completely different.
201 ** (ado, 1993-05-24)
202 */
203 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0,
204 pt, ptlim, modifier);
205 continue;
206 case 'c':
207 {
208 int warn2 = IN_SOME;
209
210 pt = _fmt(Locale->c_fmt, t, pt, ptlim, warnp, Locale);
211 if (warn2 == IN_ALL)
212 warn2 = IN_THIS;
213 if (warn2 > *warnp)
214 *warnp = warn2;
215 }
216 continue;
217 case 'D':
218 pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp, Locale);
219 continue;
220 case 'd':
221 pt = _conv(t->tm_mday,
222 getformat(modifier, "%02d",
223 "%2d", "%d", "%02d"),
224 pt, ptlim);
225 continue;
226 case 'E':
227 case 'O':
228 /*
229 ** C99 locale modifiers.
230 ** The sequences
231 ** %Ec %EC %Ex %EX %Ey %EY
232 ** %Od %oe %OH %OI %Om %OM
233 ** %OS %Ou %OU %OV %Ow %OW %Oy
234 ** are supposed to provide alternate
235 ** representations.
236 */
237 goto label;
238 case '_':
239 case '-':
240 case '0':
241 case '^':
242 case '#':
243 modifier = *format;
244 goto label;
245 case 'e':
246 pt = _conv(t->tm_mday,
247 getformat(modifier, "%2d",
248 "%2d", "%d", "%02d"),
249 pt, ptlim);
250 continue;
251 case 'F':
252 pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp, Locale);
253 continue;
254 case 'H':
255 pt = _conv(t->tm_hour,
256 getformat(modifier, "%02d",
257 "%2d", "%d", "%02d"),
258 pt, ptlim);
259 continue;
260 case 'I':
261 pt = _conv((t->tm_hour % 12) ?
262 (t->tm_hour % 12) : 12,
263 getformat(modifier, "%02d",
264 "%2d", "%d", "%02d"),
265 pt, ptlim);
266 continue;
267 case 'j':
268 pt = _conv(t->tm_yday + 1,
269 getformat(modifier, "%03d", "%3d", "%d", "%03d"),
270 pt, ptlim);
271 continue;
272 case 'k':
273 /*
274 ** This used to be...
275 ** _conv(t->tm_hour % 12 ?
276 ** t->tm_hour % 12 : 12, 2, ' ');
277 ** ...and has been changed to the below to
278 ** match SunOS 4.1.1 and Arnold Robbins'
279 ** strftime version 3.0. That is, "%k" and
280 ** "%l" have been swapped.
281 ** (ado, 1993-05-24)
282 */
283 pt = _conv(t->tm_hour,
284 getformat(modifier, "%2d",
285 "%2d", "%d", "%02d"),
286 pt, ptlim);
287 continue;
288 #ifdef KITCHEN_SINK
289 case 'K':
290 /*
291 ** After all this time, still unclaimed!
292 */
293 pt = _add("kitchen sink", pt, ptlim, modifier);
294 continue;
295 #endif /* defined KITCHEN_SINK */
296 case 'l':
297 /*
298 ** This used to be...
299 ** _conv(t->tm_hour, 2, ' ');
300 ** ...and has been changed to the below to
301 ** match SunOS 4.1.1 and Arnold Robbin's
302 ** strftime version 3.0. That is, "%k" and
303 ** "%l" have been swapped.
304 ** (ado, 1993-05-24)
305 */
306 pt = _conv((t->tm_hour % 12) ?
307 (t->tm_hour % 12) : 12,
308 getformat(modifier, "%2d",
309 "%2d", "%d", "%02d"),
310 pt, ptlim);
311 continue;
312 case 'M':
313 pt = _conv(t->tm_min,
314 getformat(modifier, "%02d",
315 "%2d", "%d", "%02d"),
316 pt, ptlim);
317 continue;
318 case 'm':
319 pt = _conv(t->tm_mon + 1,
320 getformat(modifier, "%02d",
321 "%2d", "%d", "%02d"),
322 pt, ptlim);
323 continue;
324 case 'n':
325 pt = _add("\n", pt, ptlim, modifier);
326 continue;
327 case 'p':
328 pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
329 Locale->pm :
330 Locale->am,
331 pt, ptlim, modifier);
332 continue;
333 case 'P':
334 pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
335 Locale->pm :
336 Locale->am,
337 pt, ptlim, FORCE_LOWER_CASE);
338 continue;
339 case 'R':
340 pt = _fmt("%H:%M", t, pt, ptlim, warnp, Locale);
341 continue;
342 case 'r':
343 pt = _fmt("%I:%M:%S %p", t, pt, ptlim, warnp, Locale);
344 continue;
345 case 'S':
346 pt = _conv(t->tm_sec,
347 getformat(modifier, "%02d",
348 "%2d", "%d", "%02d"),
349 pt, ptlim);
350 continue;
351 case 's':
352 {
353 struct tm tm;
354 char buf[INT_STRLEN_MAXIMUM(
355 time_t) + 1];
356 time_t mkt;
357
358 tm = *t;
359 mkt = mktime(&tm);
360 if (TYPE_SIGNED(time_t))
361 (void) sprintf(buf, "%ld",
362 (long) mkt);
363 else (void) sprintf(buf, "%lu",
364 (unsigned long) mkt);
365 pt = _add(buf, pt, ptlim, modifier);
366 }
367 continue;
368 case 'T':
369 pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp, Locale);
370 continue;
371 case 't':
372 pt = _add("\t", pt, ptlim, modifier);
373 continue;
374 case 'U':
375 pt = _conv((t->tm_yday + DAYSPERWEEK -
376 t->tm_wday) / DAYSPERWEEK,
377 getformat(modifier, "%02d",
378 "%2d", "%d", "%02d"),
379 pt, ptlim);
380 continue;
381 case 'u':
382 /*
383 ** From Arnold Robbins' strftime version 3.0:
384 ** "ISO 8601: Weekday as a decimal number
385 ** [1 (Monday) - 7]"
386 ** (ado, 1993-05-24)
387 */
388 pt = _conv((t->tm_wday == 0) ?
389 DAYSPERWEEK : t->tm_wday, "%d", pt, ptlim);
390 continue;
391 case 'V': /* ISO 8601 week number */
392 case 'G': /* ISO 8601 year (four digits) */
393 case 'g': /* ISO 8601 year (two digits) */
394 /*
395 ** From Arnold Robbins' strftime version 3.0: "the week number of the
396 ** year (the first Monday as the first day of week 1) as a decimal number
397 ** (01-53)."
398 ** (ado, 1993-05-24)
399 **
400 ** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn:
401 ** "Week 01 of a year is per definition the first week which has the
402 ** Thursday in this year, which is equivalent to the week which contains
403 ** the fourth day of January. In other words, the first week of a new year
404 ** is the week which has the majority of its days in the new year. Week 01
405 ** might also contain days from the previous year and the week before week
406 ** 01 of a year is the last week (52 or 53) of the previous year even if
407 ** it contains days from the new year. A week starts with Monday (day 1)
408 ** and ends with Sunday (day 7). For example, the first week of the year
409 ** 1997 lasts from 1996-12-30 to 1997-01-05..."
410 ** (ado, 1996-01-02)
411 */
412 {
413 int year;
414 int base;
415 int yday;
416 int wday;
417 int w;
418
419 year = t->tm_year;
420 base = TM_YEAR_BASE;
421 yday = t->tm_yday;
422 wday = t->tm_wday;
423 for ( ; ; ) {
424 int len;
425 int bot;
426 int top;
427
428 len = isleap_sum(year, base) ?
429 DAYSPERLYEAR :
430 DAYSPERNYEAR;
431 /*
432 ** What yday (-3 ... 3) does
433 ** the ISO year begin on?
434 */
435 bot = ((yday + 11 - wday) %
436 DAYSPERWEEK) - 3;
437 /*
438 ** What yday does the NEXT
439 ** ISO year begin on?
440 */
441 top = bot -
442 (len % DAYSPERWEEK);
443 if (top < -3)
444 top += DAYSPERWEEK;
445 top += len;
446 if (yday >= top) {
447 ++base;
448 w = 1;
449 break;
450 }
451 if (yday >= bot) {
452 w = 1 + ((yday - bot) /
453 DAYSPERWEEK);
454 break;
455 }
456 --base;
457 yday += isleap_sum(year, base) ?
458 DAYSPERLYEAR :
459 DAYSPERNYEAR;
460 }
461 #ifdef XPG4_1994_04_09
462 if ((w == 52 &&
463 t->tm_mon == TM_JANUARY) ||
464 (w == 1 &&
465 t->tm_mon == TM_DECEMBER))
466 w = 53;
467 #endif /* defined XPG4_1994_04_09 */
468 if (*format == 'V')
469 pt = _conv(w,
470 getformat(modifier,
471 "%02d",
472 "%2d",
473 "%d",
474 "%02d"),
475 pt, ptlim);
476 else if (*format == 'g') {
477 *warnp = IN_ALL;
478 pt = _yconv(year, base, 0, 1,
479 pt, ptlim, modifier);
480 } else pt = _yconv(year, base, 1, 1,
481 pt, ptlim, modifier);
482 }
483 continue;
484 case 'v':
485 /*
486 ** From Arnold Robbins' strftime version 3.0:
487 ** "date as dd-bbb-YYYY"
488 ** (ado, 1993-05-24)
489 */
490 pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp, Locale);
491 continue;
492 case 'W':
493 pt = _conv((t->tm_yday + DAYSPERWEEK -
494 (t->tm_wday ?
495 (t->tm_wday - 1) :
496 (DAYSPERWEEK - 1))) / DAYSPERWEEK,
497 getformat(modifier, "%02d",
498 "%2d", "%d", "%02d"),
499 pt, ptlim);
500 continue;
501 case 'w':
502 pt = _conv(t->tm_wday, "%d", pt, ptlim);
503 continue;
504 case 'X':
505 pt = _fmt(Locale->X_fmt, t, pt, ptlim, warnp, Locale);
506 continue;
507 case 'x':
508 {
509 int warn2 = IN_SOME;
510
511 pt = _fmt(Locale->x_fmt, t, pt, ptlim, &warn2, Locale);
512 if (warn2 == IN_ALL)
513 warn2 = IN_THIS;
514 if (warn2 > *warnp)
515 *warnp = warn2;
516 }
517 continue;
518 case 'y':
519 *warnp = IN_ALL;
520 pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1,
521 pt, ptlim, modifier);
522 continue;
523 case 'Y':
524 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1,
525 pt, ptlim, modifier);
526 continue;
527 case 'Z':
528 #ifdef TM_ZONE
529 if (t->TM_ZONE != NULL)
530 pt = _add(t->TM_ZONE, pt, ptlim,
531 modifier);
532 else
533 #endif /* defined TM_ZONE */
534 if (t->tm_isdst >= 0)
535 pt = _add(tzname[t->tm_isdst != 0],
536 pt, ptlim, modifier);
537 /*
538 ** C99 says that %Z must be replaced by the
539 ** empty string if the time zone is not
540 ** determinable.
541 */
542 continue;
543 case 'z':
544 {
545 int diff;
546 char const * sign;
547
548 if (t->tm_isdst < 0)
549 continue;
550 #ifdef TM_GMTOFF
551 diff = t->TM_GMTOFF;
552 #else /* !defined TM_GMTOFF */
553 /*
554 ** C99 says that the UTC offset must
555 ** be computed by looking only at
556 ** tm_isdst. This requirement is
557 ** incorrect, since it means the code
558 ** must rely on magic (in this case
559 ** altzone and timezone), and the
560 ** magic might not have the correct
561 ** offset. Doing things correctly is
562 ** tricky and requires disobeying C99;
563 ** see GNU C strftime for details.
564 ** For now, punt and conform to the
565 ** standard, even though it's incorrect.
566 **
567 ** C99 says that %z must be replaced by the
568 ** empty string if the time zone is not
569 ** determinable, so output nothing if the
570 ** appropriate variables are not available.
571 */
572 if (t->tm_isdst == 0)
573 #ifdef USG_COMPAT
574 diff = -timezone;
575 #else /* !defined USG_COMPAT */
576 continue;
577 #endif /* !defined USG_COMPAT */
578 else
579 #ifdef ALTZONE
580 diff = -altzone;
581 #else /* !defined ALTZONE */
582 continue;
583 #endif /* !defined ALTZONE */
584 #endif /* !defined TM_GMTOFF */
585 if (diff < 0) {
586 sign = "-";
587 diff = -diff;
588 } else sign = "+";
589 pt = _add(sign, pt, ptlim, modifier);
590 diff /= SECSPERMIN;
591 diff = (diff / MINSPERHOUR) * 100 +
592 (diff % MINSPERHOUR);
593 pt = _conv(diff,
594 getformat(modifier, "%04d",
595 "%4d", "%d", "%04d"),
596 pt, ptlim);
597 }
598 continue;
599 case '+':
600 pt = _fmt(Locale->date_fmt, t, pt, ptlim,
601 warnp, Locale);
602 continue;
603 case '%':
604 /*
605 ** X311J/88-090 (4.12.3.5): if conversion char is
606 ** undefined, behavior is undefined. Print out the
607 ** character itself as printf(3) also does.
608 */
609 default:
610 break;
611 }
612 }
613 if (pt == ptlim)
614 break;
615 *pt++ = *format;
616 }
617 return pt;
618 }
619
620 static char *
_conv(n,format,pt,ptlim)621 _conv(n, format, pt, ptlim)
622 const int n;
623 const char * const format;
624 char * const pt;
625 const char * const ptlim;
626 {
627 char buf[INT_STRLEN_MAXIMUM(int) + 1];
628
629 (void) sprintf(buf, format, n);
630 return _add(buf, pt, ptlim, 0);
631 }
632
633 static char *
_add(str,pt,ptlim,modifier)634 _add(str, pt, ptlim, modifier)
635 const char * str;
636 char * pt;
637 const char * const ptlim;
638 int modifier;
639 {
640 int c;
641
642 switch (modifier) {
643 case FORCE_LOWER_CASE:
644 while (pt < ptlim && (*pt = tolower(*str++)) != '\0') {
645 ++pt;
646 }
647 break;
648
649 case '^':
650 while (pt < ptlim && (*pt = toupper(*str++)) != '\0') {
651 ++pt;
652 }
653 break;
654
655 case '#':
656 while (pt < ptlim && (c = *str++) != '\0') {
657 if (isupper(c)) {
658 c = tolower(c);
659 } else if (islower(c)) {
660 c = toupper(c);
661 }
662 *pt = c;
663 ++pt;
664 }
665
666 break;
667
668 default:
669 while (pt < ptlim && (*pt = *str++) != '\0') {
670 ++pt;
671 }
672 }
673
674 return pt;
675 }
676
677 /*
678 ** POSIX and the C Standard are unclear or inconsistent about
679 ** what %C and %y do if the year is negative or exceeds 9999.
680 ** Use the convention that %C concatenated with %y yields the
681 ** same output as %Y, and that %Y contains at least 4 bytes,
682 ** with more only if necessary.
683 */
684
685 static char *
_yconv(a,b,convert_top,convert_yy,pt,ptlim,modifier)686 _yconv(a, b, convert_top, convert_yy, pt, ptlim, modifier)
687 const int a;
688 const int b;
689 const int convert_top;
690 const int convert_yy;
691 char * pt;
692 const char * const ptlim;
693 int modifier;
694 {
695 register int lead;
696 register int trail;
697
698 #define DIVISOR 100
699 trail = a % DIVISOR + b % DIVISOR;
700 lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
701 trail %= DIVISOR;
702 if (trail < 0 && lead > 0) {
703 trail += DIVISOR;
704 --lead;
705 } else if (lead < 0 && trail > 0) {
706 trail -= DIVISOR;
707 ++lead;
708 }
709 if (convert_top) {
710 if (lead == 0 && trail < 0)
711 pt = _add("-0", pt, ptlim, modifier);
712 else pt = _conv(lead, getformat(modifier, "%02d",
713 "%2d", "%d", "%02d"),
714 pt, ptlim);
715 }
716 if (convert_yy)
717 pt = _conv(((trail < 0) ? -trail : trail),
718 getformat(modifier, "%02d", "%2d", "%d", "%02d"),
719 pt, ptlim);
720 return pt;
721 }
722
723 #ifdef LOCALE_HOME
724 static struct lc_time_T *
725 _loc P((void))
726 {
727 static const char locale_home[] = LOCALE_HOME;
728 static const char lc_time[] = "LC_TIME";
729 static char * locale_buf;
730
731 int fd;
732 int oldsun; /* "...ain't got nothin' to do..." */
733 char * lbuf;
734 char * name;
735 char * p;
736 const char ** ap;
737 const char * plim;
738 char filename[FILENAME_MAX];
739 struct stat st;
740 size_t namesize;
741 size_t bufsize;
742
743 /*
744 ** Use localebuf.mon[0] to signal whether locale is already set up.
745 */
746 if (localebuf.mon[0])
747 return &localebuf;
748 name = setlocale(LC_TIME, (char *) NULL);
749 if (name == NULL || *name == '\0')
750 goto no_locale;
751 /*
752 ** If the locale name is the same as our cache, use the cache.
753 */
754 lbuf = locale_buf;
755 if (lbuf != NULL && strcmp(name, lbuf) == 0) {
756 p = lbuf;
757 for (ap = (const char **) &localebuf;
758 ap < (const char **) (&localebuf + 1);
759 ++ap)
760 *ap = p += strlen(p) + 1;
761 return &localebuf;
762 }
763 /*
764 ** Slurp the locale file into the cache.
765 */
766 namesize = strlen(name) + 1;
767 if (sizeof filename <
768 ((sizeof locale_home) + namesize + (sizeof lc_time)))
769 goto no_locale;
770 oldsun = 0;
771 (void) sprintf(filename, "%s/%s/%s", locale_home, name, lc_time);
772 fd = open(filename, O_RDONLY);
773 if (fd < 0) {
774 /*
775 ** Old Sun systems have a different naming and data convention.
776 */
777 oldsun = 1;
778 (void) sprintf(filename, "%s/%s/%s", locale_home,
779 lc_time, name);
780 fd = open(filename, O_RDONLY);
781 if (fd < 0)
782 goto no_locale;
783 }
784 if (fstat(fd, &st) != 0)
785 goto bad_locale;
786 if (st.st_size <= 0)
787 goto bad_locale;
788 bufsize = namesize + st.st_size;
789 locale_buf = NULL;
790 lbuf = (lbuf == NULL) ? malloc(bufsize) : realloc(lbuf, bufsize);
791 if (lbuf == NULL)
792 goto bad_locale;
793 (void) strcpy(lbuf, name);
794 p = lbuf + namesize;
795 plim = p + st.st_size;
796 if (read(fd, p, (size_t) st.st_size) != st.st_size)
797 goto bad_lbuf;
798 if (close(fd) != 0)
799 goto bad_lbuf;
800 /*
801 ** Parse the locale file into localebuf.
802 */
803 if (plim[-1] != '\n')
804 goto bad_lbuf;
805 for (ap = (const char **) &localebuf;
806 ap < (const char **) (&localebuf + 1);
807 ++ap) {
808 if (p == plim)
809 goto bad_lbuf;
810 *ap = p;
811 while (*p != '\n')
812 ++p;
813 *p++ = '\0';
814 }
815 if (oldsun) {
816 /*
817 ** SunOS 4 used an obsolescent format; see localdtconv(3).
818 ** c_fmt had the ``short format for dates and times together''
819 ** (SunOS 4 date, "%a %b %e %T %Z %Y" in the C locale);
820 ** date_fmt had the ``long format for dates''
821 ** (SunOS 4 strftime %C, "%A, %B %e, %Y" in the C locale).
822 ** Discard the latter in favor of the former.
823 */
824 localebuf.date_fmt = localebuf.c_fmt;
825 }
826 /*
827 ** Record the successful parse in the cache.
828 */
829 locale_buf = lbuf;
830
831 return &localebuf;
832
833 bad_lbuf:
834 free(lbuf);
835 bad_locale:
836 (void) close(fd);
837 no_locale:
838 localebuf = C_time_locale;
839 locale_buf = NULL;
840 return &localebuf;
841 }
842 #endif /* defined LOCALE_HOME */
843