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