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1.21 ! christos 1: /* $NetBSD: strftime.c,v 1.20 2009/12/31 22:49:16 mlelstv Exp $ */
1.1 mrg 2:
1.3 christos 3: #include <sys/cdefs.h>
1.1 mrg 4: #if defined(LIBC_SCCS) && !defined(lint)
1.3 christos 5: #if 0
1.13 kleink 6: static char elsieid[] = "@(#)strftime.c 7.64";
1.20 mlelstv 7: static char elsieid[] = "@(#)strftime.c 8.3";
1.3 christos 8: #else
1.21 ! christos 9: __RCSID("$NetBSD: strftime.c,v 1.20 2009/12/31 22:49:16 mlelstv Exp $");
1.3 christos 10: #endif
1.1 mrg 11: #endif /* LIBC_SCCS and not lint */
12:
1.4 jtc 13: #include "namespace.h"
1.12 kleink 14:
15: /*
16: ** Based on the UCB version with the ID appearing below.
17: ** This is ANSIish only when "multibyte character == plain character".
18: */
19:
1.11 taca 20: #include "private.h"
1.12 kleink 21:
1.16 kleink 22: /*
23: ** We don't use these extensions in strftime operation even when
24: ** supported by the local tzcode configuration. A strictly
25: ** conforming C application may leave them in undefined state.
26: */
27:
1.15 kleink 28: #ifdef _LIBC
29: #undef TM_ZONE
1.16 kleink 30: #undef TM_GMTOFF
1.15 kleink 31: #endif
32:
1.12 kleink 33: /*
1.14 itojun 34: ** Copyright (c) 1989, 1993
35: ** The Regents of the University of California. All rights reserved.
1.12 kleink 36: **
1.14 itojun 37: ** Redistribution and use in source and binary forms, with or without
38: ** modification, are permitted provided that the following conditions
39: ** are met:
40: ** 1. Redistributions of source code must retain the above copyright
41: ** notice, this list of conditions and the following disclaimer.
42: ** 2. Redistributions in binary form must reproduce the above copyright
43: ** notice, this list of conditions and the following disclaimer in the
44: ** documentation and/or other materials provided with the distribution.
45: ** 3. All advertising materials mentioning features or use of this software
46: ** must display the following acknowledgement:
47: ** This product includes software developed by the University of
48: ** California, Berkeley and its contributors.
49: ** 4. Neither the name of the University nor the names of its contributors
50: ** may be used to endorse or promote products derived from this software
51: ** without specific prior written permission.
52: **
53: ** THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54: ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55: ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56: ** ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57: ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58: ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59: ** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60: ** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61: ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62: ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63: ** SUCH DAMAGE.
1.12 kleink 64: */
65:
66: #ifndef LIBC_SCCS
67: #ifndef lint
68: static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89";
69: #endif /* !defined lint */
70: #endif /* !defined LIBC_SCCS */
71:
72: #include "tzfile.h"
73: #include "fcntl.h"
74: #include "locale.h"
75:
1.21 ! christos 76: #ifdef __weak_alias
! 77: __weak_alias(strftime_z, _strftime_z)
! 78: #endif
! 79:
1.12 kleink 80: #include "sys/localedef.h"
81: #define Locale _CurrentTimeLocale
1.20 mlelstv 82: #define c_fmt d_t_fmt
1.12 kleink 83:
1.20 mlelstv 84: static char * _add(const char *, char *, const char *);
85: static char * _conv(int, const char *, char *, const char *);
1.21 ! christos 86: static char * _fmt(const timezone_t, const char *, const struct tm *, char *,
! 87: const char *, int *);
1.20 mlelstv 88: static char * _yconv(int, int, int, int, char *, const char *);
1.12 kleink 89:
1.20 mlelstv 90: extern char * tzname[];
1.12 kleink 91:
92: #ifndef YEAR_2000_NAME
93: #define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS"
94: #endif /* !defined YEAR_2000_NAME */
95:
96: #define IN_NONE 0
97: #define IN_SOME 1
98: #define IN_THIS 2
99: #define IN_ALL 3
1.1 mrg 100:
101: size_t
1.21 ! christos 102: strftime_z(const timezone_t sp, char * const s, const size_t maxsize,
! 103: const char * const format, const struct tm * const t)
1.1 mrg 104: {
1.12 kleink 105: char * p;
106: int warn;
1.5 kleink 107:
1.12 kleink 108: warn = IN_NONE;
1.21 ! christos 109: p = _fmt(sp, ((format == NULL) ? "%c" : format), t, s, s + maxsize,
! 110: &warn);
1.12 kleink 111: #ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
112: if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) {
113: (void) fprintf(stderr, "\n");
114: if (format == NULL)
115: (void) fprintf(stderr, "NULL strftime format ");
116: else (void) fprintf(stderr, "strftime format \"%s\" ",
117: format);
118: (void) fprintf(stderr, "yields only two digits of years in ");
119: if (warn == IN_SOME)
120: (void) fprintf(stderr, "some locales");
121: else if (warn == IN_THIS)
122: (void) fprintf(stderr, "the current locale");
123: else (void) fprintf(stderr, "all locales");
124: (void) fprintf(stderr, "\n");
125: }
126: #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */
127: if (p == s + maxsize)
128: return 0;
129: *p = '\0';
130: return p - s;
1.1 mrg 131: }
132:
1.12 kleink 133: static char *
1.21 ! christos 134: _fmt(const timezone_t sp, const char *format, const struct tm * const t,
! 135: char *pt, const char *const ptlim, int *warnp)
1.1 mrg 136: {
1.12 kleink 137: for ( ; *format; ++format) {
1.1 mrg 138: if (*format == '%') {
1.12 kleink 139: label:
140: switch (*++format) {
1.1 mrg 141: case '\0':
142: --format;
143: break;
144: case 'A':
1.12 kleink 145: pt = _add((t->tm_wday < 0 ||
146: t->tm_wday >= DAYSPERWEEK) ?
147: "?" : Locale->day[t->tm_wday],
148: pt, ptlim);
1.1 mrg 149: continue;
150: case 'a':
1.12 kleink 151: pt = _add((t->tm_wday < 0 ||
152: t->tm_wday >= DAYSPERWEEK) ?
153: "?" : Locale->abday[t->tm_wday],
154: pt, ptlim);
1.1 mrg 155: continue;
156: case 'B':
1.12 kleink 157: pt = _add((t->tm_mon < 0 ||
158: t->tm_mon >= MONSPERYEAR) ?
159: "?" : Locale->mon[t->tm_mon],
160: pt, ptlim);
1.1 mrg 161: continue;
162: case 'b':
163: case 'h':
1.12 kleink 164: pt = _add((t->tm_mon < 0 ||
165: t->tm_mon >= MONSPERYEAR) ?
166: "?" : Locale->abmon[t->tm_mon],
167: pt, ptlim);
1.1 mrg 168: continue;
169: case 'C':
1.12 kleink 170: /*
171: ** %C used to do a...
172: ** _fmt("%a %b %e %X %Y", t);
173: ** ...whereas now POSIX 1003.2 calls for
174: ** something completely different.
175: ** (ado, 1993-05-24)
176: */
1.20 mlelstv 177: pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0,
178: pt, ptlim);
1.1 mrg 179: continue;
180: case 'c':
1.12 kleink 181: {
182: int warn2 = IN_SOME;
183:
1.21 ! christos 184: pt = _fmt(sp, Locale->c_fmt, t, pt, ptlim, &warn2);
1.12 kleink 185: if (warn2 == IN_ALL)
186: warn2 = IN_THIS;
187: if (warn2 > *warnp)
188: *warnp = warn2;
189: }
1.1 mrg 190: continue;
191: case 'D':
1.21 ! christos 192: pt = _fmt(sp, "%m/%d/%y", t, pt, ptlim, warnp);
1.1 mrg 193: continue;
194: case 'd':
1.12 kleink 195: pt = _conv(t->tm_mday, "%02d", pt, ptlim);
1.1 mrg 196: continue;
1.12 kleink 197: case 'E':
198: case 'O':
199: /*
200: ** C99 locale modifiers.
201: ** The sequences
202: ** %Ec %EC %Ex %EX %Ey %EY
203: ** %Od %oe %OH %OI %Om %OM
204: ** %OS %Ou %OU %OV %Ow %OW %Oy
205: ** are supposed to provide alternate
206: ** representations.
207: */
208: goto label;
1.1 mrg 209: case 'e':
1.12 kleink 210: pt = _conv(t->tm_mday, "%2d", pt, ptlim);
1.10 kleink 211: continue;
212: case 'F':
1.21 ! christos 213: pt = _fmt(sp, "%Y-%m-%d", t, pt, ptlim, warnp);
1.1 mrg 214: continue;
215: case 'H':
1.12 kleink 216: pt = _conv(t->tm_hour, "%02d", pt, ptlim);
1.1 mrg 217: continue;
218: case 'I':
1.12 kleink 219: pt = _conv((t->tm_hour % 12) ?
220: (t->tm_hour % 12) : 12,
221: "%02d", pt, ptlim);
1.1 mrg 222: continue;
223: case 'j':
1.12 kleink 224: pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim);
1.1 mrg 225: continue;
226: case 'k':
1.12 kleink 227: /*
228: ** This used to be...
229: ** _conv(t->tm_hour % 12 ?
230: ** t->tm_hour % 12 : 12, 2, ' ');
231: ** ...and has been changed to the below to
232: ** match SunOS 4.1.1 and Arnold Robbins'
1.20 mlelstv 233: ** strftime version 3.0. That is, "%k" and
1.12 kleink 234: ** "%l" have been swapped.
235: ** (ado, 1993-05-24)
236: */
237: pt = _conv(t->tm_hour, "%2d", pt, ptlim);
238: continue;
239: #ifdef KITCHEN_SINK
240: case 'K':
241: /*
242: ** After all this time, still unclaimed!
243: */
244: pt = _add("kitchen sink", pt, ptlim);
1.1 mrg 245: continue;
1.12 kleink 246: #endif /* defined KITCHEN_SINK */
1.1 mrg 247: case 'l':
1.12 kleink 248: /*
249: ** This used to be...
250: ** _conv(t->tm_hour, 2, ' ');
251: ** ...and has been changed to the below to
252: ** match SunOS 4.1.1 and Arnold Robbin's
1.20 mlelstv 253: ** strftime version 3.0. That is, "%k" and
1.12 kleink 254: ** "%l" have been swapped.
255: ** (ado, 1993-05-24)
256: */
257: pt = _conv((t->tm_hour % 12) ?
258: (t->tm_hour % 12) : 12,
259: "%2d", pt, ptlim);
1.1 mrg 260: continue;
261: case 'M':
1.12 kleink 262: pt = _conv(t->tm_min, "%02d", pt, ptlim);
1.1 mrg 263: continue;
264: case 'm':
1.12 kleink 265: pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim);
1.1 mrg 266: continue;
267: case 'n':
1.12 kleink 268: pt = _add("\n", pt, ptlim);
1.1 mrg 269: continue;
270: case 'p':
1.12 kleink 271: pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
272: Locale->am_pm[1] :
273: Locale->am_pm[0],
274: pt, ptlim);
1.1 mrg 275: continue;
276: case 'R':
1.21 ! christos 277: pt = _fmt(sp, "%H:%M", t, pt, ptlim, warnp);
1.1 mrg 278: continue;
279: case 'r':
1.21 ! christos 280: pt = _fmt(sp, Locale->t_fmt_ampm, t, pt, ptlim,
1.18 ginsbach 281: warnp);
1.1 mrg 282: continue;
283: case 'S':
1.12 kleink 284: pt = _conv(t->tm_sec, "%02d", pt, ptlim);
1.1 mrg 285: continue;
286: case 's':
1.12 kleink 287: {
288: struct tm tm;
289: char buf[INT_STRLEN_MAXIMUM(
290: time_t) + 1];
291: time_t mkt;
292:
293: tm = *t;
294: mkt = mktime(&tm);
295: /* CONSTCOND */
296: if (TYPE_SIGNED(time_t))
1.19 christos 297: (void) snprintf(buf, sizeof(buf),
298: "%lld", (long long) mkt);
299: else (void) snprintf(buf, sizeof(buf),
300: "%llu", (unsigned long long)
301: mkt);
1.12 kleink 302: pt = _add(buf, pt, ptlim);
303: }
1.1 mrg 304: continue;
305: case 'T':
1.21 ! christos 306: pt = _fmt(sp, "%H:%M:%S", t, pt, ptlim, warnp);
1.1 mrg 307: continue;
308: case 't':
1.12 kleink 309: pt = _add("\t", pt, ptlim);
1.1 mrg 310: continue;
311: case 'U':
1.12 kleink 312: pt = _conv((t->tm_yday + DAYSPERWEEK -
313: t->tm_wday) / DAYSPERWEEK,
314: "%02d", pt, ptlim);
1.1 mrg 315: continue;
316: case 'u':
1.12 kleink 317: /*
318: ** From Arnold Robbins' strftime version 3.0:
319: ** "ISO 8601: Weekday as a decimal number
320: ** [1 (Monday) - 7]"
321: ** (ado, 1993-05-24)
322: */
323: pt = _conv((t->tm_wday == 0) ?
324: DAYSPERWEEK : t->tm_wday,
325: "%d", pt, ptlim);
1.1 mrg 326: continue;
1.8 augustss 327: case 'V': /* ISO 8601 week number */
328: case 'G': /* ISO 8601 year (four digits) */
329: case 'g': /* ISO 8601 year (two digits) */
330: /*
1.20 mlelstv 331: ** From Arnold Robbins' strftime version 3.0: "the week number of the
1.8 augustss 332: ** year (the first Monday as the first day of week 1) as a decimal number
333: ** (01-53)."
334: ** (ado, 1993-05-24)
335: **
336: ** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn:
337: ** "Week 01 of a year is per definition the first week which has the
338: ** Thursday in this year, which is equivalent to the week which contains
339: ** the fourth day of January. In other words, the first week of a new year
340: ** is the week which has the majority of its days in the new year. Week 01
341: ** might also contain days from the previous year and the week before week
342: ** 01 of a year is the last week (52 or 53) of the previous year even if
343: ** it contains days from the new year. A week starts with Monday (day 1)
1.20 mlelstv 344: ** and ends with Sunday (day 7). For example, the first week of the year
1.8 augustss 345: ** 1997 lasts from 1996-12-30 to 1997-01-05..."
346: ** (ado, 1996-01-02)
347: */
1.1 mrg 348: {
1.8 augustss 349: int year;
1.20 mlelstv 350: int base;
1.8 augustss 351: int yday;
352: int wday;
353: int w;
354:
1.20 mlelstv 355: year = t->tm_year;
356: base = TM_YEAR_BASE;
1.8 augustss 357: yday = t->tm_yday;
358: wday = t->tm_wday;
359: for ( ; ; ) {
360: int len;
361: int bot;
362: int top;
363:
1.20 mlelstv 364: len = isleap_sum(year, base) ?
1.8 augustss 365: DAYSPERLYEAR :
366: DAYSPERNYEAR;
367: /*
368: ** What yday (-3 ... 3) does
369: ** the ISO year begin on?
370: */
371: bot = ((yday + 11 - wday) %
372: DAYSPERWEEK) - 3;
373: /*
374: ** What yday does the NEXT
375: ** ISO year begin on?
376: */
377: top = bot -
378: (len % DAYSPERWEEK);
379: if (top < -3)
380: top += DAYSPERWEEK;
381: top += len;
382: if (yday >= top) {
1.20 mlelstv 383: ++base;
1.8 augustss 384: w = 1;
385: break;
386: }
387: if (yday >= bot) {
388: w = 1 + ((yday - bot) /
389: DAYSPERWEEK);
390: break;
391: }
1.20 mlelstv 392: --base;
393: yday += isleap_sum(year, base) ?
1.8 augustss 394: DAYSPERLYEAR :
395: DAYSPERNYEAR;
396: }
397: #ifdef XPG4_1994_04_09
1.20 mlelstv 398: if ((w == 52 &&
399: t->tm_mon == TM_JANUARY) ||
400: (w == 1 &&
401: t->tm_mon == TM_DECEMBER))
402: w = 53;
1.8 augustss 403: #endif /* defined XPG4_1994_04_09 */
1.12 kleink 404: if (*format == 'V')
405: pt = _conv(w, "%02d",
406: pt, ptlim);
407: else if (*format == 'g') {
408: *warnp = IN_ALL;
1.20 mlelstv 409: pt = _yconv(year, base, 0, 1,
1.12 kleink 410: pt, ptlim);
1.20 mlelstv 411: } else pt = _yconv(year, base, 1, 1,
1.12 kleink 412: pt, ptlim);
1.1 mrg 413: }
414: continue;
1.12 kleink 415: case 'v':
416: /*
417: ** From Arnold Robbins' strftime version 3.0:
418: ** "date as dd-bbb-YYYY"
419: ** (ado, 1993-05-24)
420: */
1.21 ! christos 421: pt = _fmt(sp, "%e-%b-%Y", t, pt, ptlim, warnp);
1.12 kleink 422: continue;
1.1 mrg 423: case 'W':
1.12 kleink 424: pt = _conv((t->tm_yday + DAYSPERWEEK -
425: (t->tm_wday ?
426: (t->tm_wday - 1) :
427: (DAYSPERWEEK - 1))) / DAYSPERWEEK,
428: "%02d", pt, ptlim);
1.1 mrg 429: continue;
430: case 'w':
1.12 kleink 431: pt = _conv(t->tm_wday, "%d", pt, ptlim);
432: continue;
433: case 'X':
1.21 ! christos 434: pt = _fmt(sp, Locale->t_fmt, t, pt, ptlim, warnp);
1.1 mrg 435: continue;
436: case 'x':
1.12 kleink 437: {
438: int warn2 = IN_SOME;
439:
1.21 ! christos 440: pt = _fmt(sp, Locale->d_fmt, t, pt, ptlim, &warn2);
1.12 kleink 441: if (warn2 == IN_ALL)
442: warn2 = IN_THIS;
443: if (warn2 > *warnp)
444: *warnp = warn2;
445: }
1.1 mrg 446: continue;
447: case 'y':
1.12 kleink 448: *warnp = IN_ALL;
1.20 mlelstv 449: pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1,
450: pt, ptlim);
1.1 mrg 451: continue;
452: case 'Y':
1.20 mlelstv 453: pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1,
1.12 kleink 454: pt, ptlim);
1.1 mrg 455: continue;
456: case 'Z':
1.11 taca 457: #ifdef TM_ZONE
1.12 kleink 458: if (t->TM_ZONE != NULL)
459: pt = _add(t->TM_ZONE, pt, ptlim);
460: else
461: #endif /* defined TM_ZONE */
462: if (t->tm_isdst >= 0)
1.21 ! christos 463: pt = _add((sp ?
! 464: tzgetname(sp, t->tm_isdst) :
! 465: tzname[t->tm_isdst != 0]),
! 466: pt, ptlim);
1.12 kleink 467: /*
468: ** C99 says that %Z must be replaced by the
469: ** empty string if the time zone is not
470: ** determinable.
471: */
472: continue;
473: case 'z':
474: {
475: int diff;
476: char const * sign;
477:
478: if (t->tm_isdst < 0)
479: continue;
480: #ifdef TM_GMTOFF
481: diff = (int)t->TM_GMTOFF;
482: #else /* !defined TM_GMTOFF */
483: /*
484: ** C99 says that the UTC offset must
485: ** be computed by looking only at
1.20 mlelstv 486: ** tm_isdst. This requirement is
1.12 kleink 487: ** incorrect, since it means the code
488: ** must rely on magic (in this case
489: ** altzone and timezone), and the
490: ** magic might not have the correct
1.20 mlelstv 491: ** offset. Doing things correctly is
1.12 kleink 492: ** tricky and requires disobeying C99;
493: ** see GNU C strftime for details.
494: ** For now, punt and conform to the
495: ** standard, even though it's incorrect.
496: **
497: ** C99 says that %z must be replaced by the
498: ** empty string if the time zone is not
499: ** determinable, so output nothing if the
500: ** appropriate variables are not available.
501: */
1.16 kleink 502: #ifndef STD_INSPIRED
1.12 kleink 503: if (t->tm_isdst == 0)
504: #ifdef USG_COMPAT
505: diff = -timezone;
1.13 kleink 506: #else /* !defined USG_COMPAT */
1.12 kleink 507: continue;
508: #endif /* !defined USG_COMPAT */
509: else
510: #ifdef ALTZONE
511: diff = -altzone;
512: #else /* !defined ALTZONE */
513: continue;
514: #endif /* !defined ALTZONE */
1.16 kleink 515: #else /* defined STD_INSPIRED */
516: {
517: struct tm tmp;
518: time_t lct, gct;
519:
520: /*
521: ** Get calendar time from t
522: ** being treated as local.
523: */
524: tmp = *t; /* mktime discards const */
525: lct = mktime(&tmp);
526:
527: if (lct == (time_t)-1)
528: continue;
529:
530: /*
531: ** Get calendar time from t
532: ** being treated as GMT.
533: **/
534: tmp = *t; /* mktime discards const */
535: gct = timegm(&tmp);
536:
537: if (gct == (time_t)-1)
538: continue;
539:
540: /* LINTED difference will fit int */
541: diff = (intmax_t)gct - (intmax_t)lct;
542: }
543: #endif /* defined STD_INSPIRED */
1.12 kleink 544: #endif /* !defined TM_GMTOFF */
545: if (diff < 0) {
546: sign = "-";
547: diff = -diff;
548: } else sign = "+";
549: pt = _add(sign, pt, ptlim);
1.20 mlelstv 550: diff /= SECSPERMIN;
551: diff = (diff / MINSPERHOUR) * 100 +
552: (diff % MINSPERHOUR);
553: pt = _conv(diff, "%04d", pt, ptlim);
1.12 kleink 554: }
1.1 mrg 555: continue;
1.12 kleink 556: #if 0
557: case '+':
1.21 ! christos 558: pt = _fmt(sp, Locale->date_fmt, t, pt, ptlim,
1.12 kleink 559: warnp);
560: continue;
561: #endif
1.1 mrg 562: case '%':
563: /*
1.12 kleink 564: ** X311J/88-090 (4.12.3.5): if conversion char is
1.20 mlelstv 565: ** undefined, behavior is undefined. Print out the
1.12 kleink 566: ** character itself as printf(3) also does.
567: */
1.1 mrg 568: default:
569: break;
570: }
571: }
1.12 kleink 572: if (pt == ptlim)
573: break;
574: *pt++ = *format;
1.1 mrg 575: }
1.12 kleink 576: return pt;
1.1 mrg 577: }
578:
1.21 ! christos 579: size_t
! 580: strftime(char * const s, const size_t maxsize,
! 581: const char * const format, const struct tm * const t)
! 582: {
! 583: tzset();
! 584: return strftime_z(NULL, s, maxsize, format, t);
! 585: }
! 586:
1.12 kleink 587: static char *
588: _conv(n, format, pt, ptlim)
589: const int n;
590: const char * const format;
591: char * const pt;
592: const char * const ptlim;
1.1 mrg 593: {
1.12 kleink 594: char buf[INT_STRLEN_MAXIMUM(int) + 1];
1.1 mrg 595:
1.19 christos 596: (void) snprintf(buf, sizeof(buf), format, n);
1.12 kleink 597: return _add(buf, pt, ptlim);
1.1 mrg 598: }
599:
1.12 kleink 600: static char *
1.5 kleink 601: _add(str, pt, ptlim)
1.12 kleink 602: const char * str;
603: char * pt;
604: const char * const ptlim;
1.1 mrg 605: {
1.12 kleink 606: while (pt < ptlim && (*pt = *str++) != '\0')
607: ++pt;
608: return pt;
1.1 mrg 609: }
1.20 mlelstv 610:
611: /*
612: ** POSIX and the C Standard are unclear or inconsistent about
613: ** what %C and %y do if the year is negative or exceeds 9999.
614: ** Use the convention that %C concatenated with %y yields the
615: ** same output as %Y, and that %Y contains at least 4 bytes,
616: ** with more only if necessary.
617: */
618:
619: static char *
620: _yconv(a, b, convert_top, convert_yy, pt, ptlim)
621: const int a;
622: const int b;
623: const int convert_top;
624: const int convert_yy;
625: char * pt;
626: const char * const ptlim;
627: {
628: register int lead;
629: register int trail;
630:
631: #define DIVISOR 100
632: trail = a % DIVISOR + b % DIVISOR;
633: lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
634: trail %= DIVISOR;
635: if (trail < 0 && lead > 0) {
636: trail += DIVISOR;
637: --lead;
638: } else if (lead < 0 && trail > 0) {
639: trail -= DIVISOR;
640: ++lead;
641: }
642: if (convert_top) {
643: if (lead == 0 && trail < 0)
644: pt = _add("-0", pt, ptlim);
645: else pt = _conv(lead, "%02d", pt, ptlim);
646: }
647: if (convert_yy)
648: pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim);
649: return pt;
650: }
651:
652: #ifdef LOCALE_HOME
653: static struct lc_time_T *
654: _loc(void)
655: {
656: static const char locale_home[] = LOCALE_HOME;
657: static const char lc_time[] = "LC_TIME";
658: static char * locale_buf;
659:
660: int fd;
661: int oldsun; /* "...ain't got nothin' to do..." */
662: char * lbuf;
663: char * name;
664: char * p;
665: const char ** ap;
666: const char * plim;
667: char filename[FILENAME_MAX];
668: struct stat st;
669: size_t namesize;
670: size_t bufsize;
671:
672: /*
673: ** Use localebuf.mon[0] to signal whether locale is already set up.
674: */
675: if (localebuf.mon[0])
676: return &localebuf;
677: name = setlocale(LC_TIME, (char *) NULL);
678: if (name == NULL || *name == '\0')
679: goto no_locale;
680: /*
681: ** If the locale name is the same as our cache, use the cache.
682: */
683: lbuf = locale_buf;
684: if (lbuf != NULL && strcmp(name, lbuf) == 0) {
685: p = lbuf;
686: for (ap = (const char **) &localebuf;
687: ap < (const char **) (&localebuf + 1);
688: ++ap)
689: *ap = p += strlen(p) + 1;
690: return &localebuf;
691: }
692: /*
693: ** Slurp the locale file into the cache.
694: */
695: namesize = strlen(name) + 1;
696: if (sizeof filename <
697: ((sizeof locale_home) + namesize + (sizeof lc_time)))
698: goto no_locale;
699: oldsun = 0;
700: (void) sprintf(filename, "%s/%s/%s", locale_home, name, lc_time);
701: fd = open(filename, O_RDONLY);
702: if (fd < 0) {
703: /*
704: ** Old Sun systems have a different naming and data convention.
705: */
706: oldsun = 1;
707: (void) sprintf(filename, "%s/%s/%s", locale_home,
708: lc_time, name);
709: fd = open(filename, O_RDONLY);
710: if (fd < 0)
711: goto no_locale;
712: }
713: if (fstat(fd, &st) != 0)
714: goto bad_locale;
715: if (st.st_size <= 0)
716: goto bad_locale;
717: bufsize = namesize + st.st_size;
718: locale_buf = NULL;
719: lbuf = (lbuf == NULL) ? malloc(bufsize) : realloc(lbuf, bufsize);
720: if (lbuf == NULL)
721: goto bad_locale;
722: (void) strcpy(lbuf, name);
723: p = lbuf + namesize;
724: plim = p + st.st_size;
725: if (read(fd, p, (size_t) st.st_size) != st.st_size)
726: goto bad_lbuf;
727: if (close(fd) != 0)
728: goto bad_lbuf;
729: /*
730: ** Parse the locale file into localebuf.
731: */
732: if (plim[-1] != '\n')
733: goto bad_lbuf;
734: for (ap = (const char **) &localebuf;
735: ap < (const char **) (&localebuf + 1);
736: ++ap) {
737: if (p == plim)
738: goto bad_lbuf;
739: *ap = p;
740: while (*p != '\n')
741: ++p;
742: *p++ = '\0';
743: }
744: if (oldsun) {
745: /*
746: ** SunOS 4 used an obsolescent format; see localdtconv(3).
747: ** c_fmt had the ``short format for dates and times together''
748: ** (SunOS 4 date, "%a %b %e %T %Z %Y" in the C locale);
749: ** date_fmt had the ``long format for dates''
750: ** (SunOS 4 strftime %C, "%A, %B %e, %Y" in the C locale).
751: ** Discard the latter in favor of the former.
752: */
753: localebuf.date_fmt = localebuf.c_fmt;
754: }
755: /*
756: ** Record the successful parse in the cache.
757: */
758: locale_buf = lbuf;
759:
760: return &localebuf;
761:
762: bad_lbuf:
763: free(lbuf);
764: bad_locale:
765: (void) close(fd);
766: no_locale:
767: localebuf = C_time_locale;
768: locale_buf = NULL;
769: return &localebuf;
770: }
771: #endif /* defined LOCALE_HOME */