1: /* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
2:
3: NOTE: The canonical source of this file is maintained with the GNU C
4: Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
5:
6: This program is free software; you can redistribute it and/or modify it
7: under the terms of the GNU General Public License as published by the
8: Free Software Foundation; either version 2, or (at your option) any
9: later version.
10:
11: This program is distributed in the hope that it will be useful,
12: but WITHOUT ANY WARRANTY; without even the implied warranty of
13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: GNU General Public License for more details.
15:
16: You should have received a copy of the GNU General Public License
17: along with this program; if not, write to the Free Software Foundation,
18: Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19:
20: #ifdef HAVE_CONFIG_H
21: # include <config.h>
22: #endif
23:
24: #ifdef _LIBC
25: # define HAVE_LIMITS_H 1
26: # define HAVE_MBLEN 1
27: # define HAVE_MBRLEN 1
28: # define HAVE_STRUCT_ERA_ENTRY 1
29: # define HAVE_TM_GMTOFF 1
30: # define HAVE_TM_ZONE 1
31: # define MULTIBYTE_IS_FORMAT_SAFE 1
32: # define STDC_HEADERS 1
33: # include <ansidecl.h>
34: # include "../locale/localeinfo.h"
35: #endif
36:
37: #include <sys/types.h> /* Some systems define `time_t' here. */
38:
39: #ifdef TIME_WITH_SYS_TIME
40: # include <sys/time.h>
41: # include <time.h>
42: #else
43: # ifdef HAVE_SYS_TIME_H
44: # include <sys/time.h>
45: # else
46: # include <time.h>
47: # endif
48: #endif
49:
50: #if HAVE_TZNAME
51: extern char *tzname[];
52: #endif
53:
54: /* Do multibyte processing if multibytes are supported, unless
55: multibyte sequences are safe in formats. Multibyte sequences are
56: safe if they cannot contain byte sequences that look like format
57: conversion specifications. The GNU C Library uses UTF8 multibyte
58: encoding, which is safe for formats, but strftime.c can be used
59: with other C libraries that use unsafe encodings. */
60: #define DO_MULTIBYTE (HAVE_MBLEN && ! MULTIBYTE_IS_FORMAT_SAFE)
61:
62: #if DO_MULTIBYTE
63: # if HAVE_MBRLEN
64: # include <wchar.h>
65: # else
66: /* Simulate mbrlen with mblen as best we can. */
67: # define mbstate_t int
68: # define mbrlen(s, n, ps) mblen (s, n)
69: # define mbsinit(ps) (*(ps) == 0)
70: # endif
71: static const mbstate_t mbstate_zero;
72: #endif
73:
74: #if HAVE_LIMITS_H
75: # include <limits.h>
76: #endif
77:
78: #if STDC_HEADERS
79: # include <stddef.h>
80: # include <stdlib.h>
81: # include <string.h>
82: #else
83: # define memcpy(d, s, n) bcopy (s, d, n)
84: #endif
85:
86: #ifndef __P
87: #if defined (__GNUC__) || (defined (__STDC__) && __STDC__)
88: #define __P(args) args
89: #else
90: #define __P(args) ()
91: #endif /* GCC. */
92: #endif /* Not __P. */
93:
94: #ifndef PTR
95: #ifdef __STDC__
96: #define PTR void *
97: #else
98: #define PTR char *
99: #endif
100: #endif
101:
102: #ifndef CHAR_BIT
103: #define CHAR_BIT 8
104: #endif
105:
106: #define TYPE_SIGNED(t) ((t) -1 < 0)
107:
108: /* Bound on length of the string representing an integer value of type t.
109: Subtract one for the sign bit if t is signed;
110: 302 / 1000 is log10 (2) rounded up;
111: add one for integer division truncation;
112: add one more for a minus sign if t is signed. */
113: #define INT_STRLEN_BOUND(t) \
114: ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 100 + 1 + TYPE_SIGNED (t))
115:
116: #define TM_YEAR_BASE 1900
117:
118: #ifndef __isleap
119: /* Nonzero if YEAR is a leap year (every 4 years,
120: except every 100th isn't, and every 400th is). */
121: #define __isleap(year) \
122: ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
123: #endif
124:
125:
126: #ifdef _LIBC
127: # define gmtime_r __gmtime_r
128: # define localtime_r __localtime_r
129: #else
130: # if ! HAVE_LOCALTIME_R
131: # if ! HAVE_TM_GMTOFF
132: /* Approximate gmtime_r as best we can in its absence. */
133: #define gmtime_r my_gmtime_r
134: static struct tm *gmtime_r __P ((const time_t *, struct tm *));
135: static struct tm *
136: gmtime_r (t, tp)
137: const time_t *t;
138: struct tm *tp;
139: {
140: struct tm *l = gmtime (t);
141: if (! l)
142: return 0;
143: *tp = *l;
144: return tp;
145: }
146: # endif /* ! HAVE_TM_GMTOFF */
147:
148: /* Approximate localtime_r as best we can in its absence. */
149: #define localtime_r my_localtime_r
150: static struct tm *localtime_r __P ((const time_t *, struct tm *));
151: static struct tm *
152: localtime_r (t, tp)
153: const time_t *t;
154: struct tm *tp;
155: {
156: struct tm *l = localtime (t);
157: if (! l)
158: return 0;
159: *tp = *l;
160: return tp;
161: }
162: # endif /* ! HAVE_LOCALTIME_R */
163: #endif /* ! defined (_LIBC) */
164:
165:
166: #define add(n, f) \
167: do \
168: { \
169: i += (n); \
170: if (i >= maxsize) \
171: return 0; \
172: else \
173: if (p) \
174: { \
175: f; \
176: p += (n); \
177: } \
178: } while (0)
179: #define cpy(n, s) add ((n), memcpy((PTR) p, (PTR) (s), (n)))
180:
181: #if ! HAVE_TM_GMTOFF
182: /* Yield the difference between *A and *B,
183: measured in seconds, ignoring leap seconds. */
184: static int tm_diff __P ((const struct tm *, const struct tm *));
185: static int
186: tm_diff (a, b)
187: const struct tm *a;
188: const struct tm *b;
189: {
190: /* Compute intervening leap days correctly even if year is negative.
191: Take care to avoid int overflow in leap day calculations,
192: but it's OK to assume that A and B are close to each other. */
193: int a4 = (a->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (a->tm_year & 3);
194: int b4 = (b->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (b->tm_year & 3);
195: int a100 = a4 / 25 - (a4 % 25 < 0);
196: int b100 = b4 / 25 - (b4 % 25 < 0);
197: int a400 = a100 >> 2;
198: int b400 = b100 >> 2;
199: int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
200: int years = a->tm_year - b->tm_year;
201: int days = (365 * years + intervening_leap_days
202: + (a->tm_yday - b->tm_yday));
203: return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
204: + (a->tm_min - b->tm_min))
205: + (a->tm_sec - b->tm_sec));
206: }
207: #endif /* ! HAVE_TM_GMTOFF */
208:
209:
210:
211: /* The number of days from the first day of the first ISO week of this
212: year to the year day YDAY with week day WDAY. ISO weeks start on
213: Monday; the first ISO week has the year's first Thursday. YDAY may
214: be as small as YDAY_MINIMUM. */
215: #define ISO_WEEK_START_WDAY 1 /* Monday */
216: #define ISO_WEEK1_WDAY 4 /* Thursday */
217: #define YDAY_MINIMUM (-366)
218: static int iso_week_days __P ((int, int));
219: #ifdef __GNUC__
220: inline
221: #endif
222: static int
223: iso_week_days (yday, wday)
224: int yday;
225: int wday;
226: {
227: /* Add enough to the first operand of % to make it nonnegative. */
228: int big_enough_multiple_of_7 = (-YDAY_MINIMUM / 7 + 2) * 7;
229: return (yday
230: - (yday - wday + ISO_WEEK1_WDAY + big_enough_multiple_of_7) % 7
231: + ISO_WEEK1_WDAY - ISO_WEEK_START_WDAY);
232: }
233:
234:
235: #ifndef _NL_CURRENT
236: static char const weekday_name[][10] =
237: {
238: "Sunday", "Monday", "Tuesday", "Wednesday",
239: "Thursday", "Friday", "Saturday"
240: };
241: static char const month_name[][10] =
242: {
243: "January", "February", "March", "April", "May", "June",
244: "July", "August", "September", "October", "November", "December"
245: };
246: #endif
247:
248: /* Write information from TP into S according to the format
249: string FORMAT, writing no more that MAXSIZE characters
250: (including the terminating '\0') and returning number of
251: characters written. If S is NULL, nothing will be written
252: anywhere, so to determine how many characters would be
253: written, use NULL for S and (size_t) UINT_MAX for MAXSIZE. */
254: size_t
255: strftime (s, maxsize, format, tp)
256: char *s;
257: size_t maxsize;
258: const char *format;
259: register const struct tm *tp;
260: {
261: int hour12 = tp->tm_hour;
262: #ifdef _NL_CURRENT
263: const char *const a_wkday = _NL_CURRENT (LC_TIME, ABDAY_1 + tp->tm_wday);
264: const char *const f_wkday = _NL_CURRENT (LC_TIME, DAY_1 + tp->tm_wday);
265: const char *const a_month = _NL_CURRENT (LC_TIME, ABMON_1 + tp->tm_mon);
266: const char *const f_month = _NL_CURRENT (LC_TIME, MON_1 + tp->tm_mon);
267: const char *const ampm = _NL_CURRENT (LC_TIME,
268: hour12 > 11 ? PM_STR : AM_STR);
269: size_t aw_len = strlen (a_wkday);
270: size_t am_len = strlen (a_month);
271: size_t ap_len = strlen (ampm);
272: #else
273: const char *const f_wkday = weekday_name[tp->tm_wday];
274: const char *const f_month = month_name[tp->tm_mon];
275: const char *const a_wkday = f_wkday;
276: const char *const a_month = f_month;
277: const char *const ampm = "AMPM" + 2 * (hour12 > 11);
278: size_t aw_len = 3;
279: size_t am_len = 3;
280: size_t ap_len = 2;
281: #endif
282: size_t wkday_len = strlen (f_wkday);
283: size_t month_len = strlen (f_month);
284: const char *zone;
285: size_t zonelen;
286: register size_t i = 0;
287: register char *p = s;
288: register const char *f;
289:
290: zone = 0;
291: #if HAVE_TM_ZONE
292: zone = (const char *) tp->tm_zone;
293: #endif
294: #if HAVE_TZNAME
295: if (!(zone && *zone) && tp->tm_isdst >= 0)
296: zone = tzname[tp->tm_isdst];
297: #endif
298: if (! zone)
299: zone = ""; /* POSIX.2 requires the empty string here. */
300:
301: zonelen = strlen (zone);
302:
303: if (hour12 > 12)
304: hour12 -= 12;
305: else
306: if (hour12 == 0) hour12 = 12;
307:
308: for (f = format; *f != '\0'; ++f)
309: {
310: int pad; /* Padding for number ('-', '_', or 0). */
311: int modifier; /* Field modifier ('E', 'O', or 0). */
312: int digits; /* Max digits for numeric format. */
313: int number_value; /* Numeric value to be printed. */
314: int negative_number; /* 1 if the number is negative. */
315: const char *subfmt;
316: char *bufp;
317: char buf[1 + (sizeof (int) < sizeof (time_t)
318: ? INT_STRLEN_BOUND (time_t)
319: : INT_STRLEN_BOUND (int))];
320:
321: #if DO_MULTIBYTE
322:
323: switch (*f)
324: {
325: case '%':
326: break;
327:
328: case '\a': case '\b': case '\t': case '\n':
329: case '\v': case '\f': case '\r':
330: case ' ': case '!': case '"': case '#': case '&': case'\'':
331: case '(': case ')': case '*': case '+': case ',': case '-':
332: case '.': case '/': case '0': case '1': case '2': case '3':
333: case '4': case '5': case '6': case '7': case '8': case '9':
334: case ':': case ';': case '<': case '=': case '>': case '?':
335: case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
336: case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
337: case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
338: case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
339: case 'Y': case 'Z': case '[': case'\\': case ']': case '^':
340: case '_': case 'a': case 'b': case 'c': case 'd': case 'e':
341: case 'f': case 'g': case 'h': case 'i': case 'j': case 'k':
342: case 'l': case 'm': case 'n': case 'o': case 'p': case 'q':
343: case 'r': case 's': case 't': case 'u': case 'v': case 'w':
344: case 'x': case 'y': case 'z': case '{': case '|': case '}':
345: case '~':
346: /* The C Standard requires these 98 characters (plus '%') to
347: be in the basic execution character set. None of these
348: characters can start a multibyte sequence, so they need
349: not be analyzed further. */
350: add (1, *p = *f);
351: continue;
352:
353: default:
354: /* Copy this multibyte sequence until we reach its end, find
355: an error, or come back to the initial shift state. */
356: {
357: mbstate_t mbstate = mbstate_zero;
358: size_t len = 0;
359:
360: do
361: {
362: size_t bytes = mbrlen (f + len, (size_t) -1, &mbstate);
363:
364: if (bytes == 0)
365: break;
366:
367: if (bytes == (size_t) -2 || bytes == (size_t) -1)
368: {
369: len++;
370: break;
371: }
372:
373: len += bytes;
374: }
375: while (! mbsinit (&mbstate));
376:
377: cpy (len, f);
378: continue;
379: }
380: }
381:
382: #else /* ! DO_MULTIBYTE */
383:
384: /* Either multibyte encodings are not supported, or they are
385: safe for formats, so any non-'%' byte can be copied through. */
386: if (*f != '%')
387: {
388: add (1, *p = *f);
389: continue;
390: }
391:
392: #endif /* ! DO_MULTIBYTE */
393:
394: /* Check for flags that can modify a number format. */
395: ++f;
396: switch (*f)
397: {
398: case '_':
399: case '-':
400: pad = *f++;
401: break;
402:
403: default:
404: pad = 0;
405: break;
406: }
407:
408: /* Check for modifiers. */
409: switch (*f)
410: {
411: case 'E':
412: case 'O':
413: modifier = *f++;
414: break;
415:
416: default:
417: modifier = 0;
418: break;
419: }
420:
421: /* Now do the specified format. */
422: switch (*f)
423: {
424: #define DO_NUMBER(d, v) \
425: digits = d; number_value = v; goto do_number
426: #define DO_NUMBER_SPACEPAD(d, v) \
427: digits = d; number_value = v; goto do_number_spacepad
428:
429: case '%':
430: if (modifier != 0)
431: goto bad_format;
432: add (1, *p = *f);
433: break;
434:
435: case 'a':
436: if (modifier != 0)
437: goto bad_format;
438: cpy (aw_len, a_wkday);
439: break;
440:
441: case 'A':
442: if (modifier != 0)
443: goto bad_format;
444: cpy (wkday_len, f_wkday);
445: break;
446:
447: case 'b':
448: case 'h': /* POSIX.2 extension. */
449: if (modifier != 0)
450: goto bad_format;
451: cpy (am_len, a_month);
452: break;
453:
454: case 'B':
455: if (modifier != 0)
456: goto bad_format;
457: cpy (month_len, f_month);
458: break;
459:
460: case 'c':
461: if (modifier == 'O')
462: goto bad_format;
463: #ifdef _NL_CURRENT
464: if (! (modifier == 'E'
465: && *(subfmt = _NL_CURRENT (LC_TIME, ERA_D_T_FMT)) != '\0'))
466: subfmt = _NL_CURRENT (LC_TIME, D_T_FMT);
467: #else
468: subfmt = "%a %b %e %H:%M:%S %Y";
469: #endif
470:
471: subformat:
472: {
473: size_t len = strftime (p, maxsize - i, subfmt, tp);
474: if (len == 0 && *subfmt)
475: return 0;
476: add (len, ;);
477: }
478: break;
479:
480: case 'C': /* POSIX.2 extension. */
481: if (modifier == 'O')
482: goto bad_format;
483: #if HAVE_STRUCT_ERA_ENTRY
484: if (modifier == 'E')
485: {
486: struct era_entry *era = _nl_get_era_entry (tp);
487: if (era)
488: {
489: size_t len = strlen (era->name_fmt);
490: cpy (len, era->name_fmt);
491: break;
492: }
493: }
494: #endif
495: {
496: int year = tp->tm_year + TM_YEAR_BASE;
497: DO_NUMBER (1, year / 100 - (year % 100 < 0));
498: }
499:
500: case 'x':
501: if (modifier == 'O')
502: goto bad_format;
503: #ifdef _NL_CURRENT
504: if (! (modifier == 'E'
505: && *(subfmt = _NL_CURRENT (LC_TIME, ERA_D_FMT)) != '\0'))
506: subfmt = _NL_CURRENT (LC_TIME, D_FMT);
507: goto subformat;
508: #endif
509: /* Fall through. */
510: case 'D': /* POSIX.2 extension. */
511: if (modifier != 0)
512: goto bad_format;
513: subfmt = "%m/%d/%y";
514: goto subformat;
515:
516: case 'd':
517: if (modifier == 'E')
518: goto bad_format;
519:
520: DO_NUMBER (2, tp->tm_mday);
521:
522: case 'e': /* POSIX.2 extension. */
523: if (modifier == 'E')
524: goto bad_format;
525:
526: DO_NUMBER_SPACEPAD (2, tp->tm_mday);
527:
528: /* All numeric formats set DIGITS and NUMBER_VALUE and then
529: jump to one of these two labels. */
530:
531: do_number_spacepad:
532: /* Force `_' flag. */
533: pad = '_';
534:
535: do_number:
536: /* Format the number according to the MODIFIER flag. */
537:
538: #ifdef _NL_CURRENT
539: if (modifier == 'O' && 0 <= number_value)
540: {
541: /* Get the locale specific alternate representation of
542: the number NUMBER_VALUE. If none exist NULL is returned. */
543: const char *cp = _nl_get_alt_digit (number_value);
544:
545: if (cp != NULL)
546: {
547: size_t digitlen = strlen (cp);
548: if (digitlen != 0)
549: {
550: cpy (digitlen, cp);
551: break;
552: }
553: }
554: }
555: #endif
556: {
557: unsigned int u = number_value;
558:
559: bufp = buf + sizeof (buf);
560: negative_number = number_value < 0;
561:
562: if (negative_number)
563: u = -u;
564:
565: do
566: *--bufp = u % 10 + '0';
567: while ((u /= 10) != 0);
568: }
569:
570: do_number_sign_and_padding:
571: if (negative_number)
572: *--bufp = '-';
573:
574: if (pad != '-')
575: {
576: int padding = digits - (buf + sizeof (buf) - bufp);
577:
578: if (pad == '_')
579: {
580: while (0 < padding--)
581: *--bufp = ' ';
582: }
583: else
584: {
585: bufp += negative_number;
586: while (0 < padding--)
587: *--bufp = '0';
588: if (negative_number)
589: *--bufp = '-';
590: }
591: }
592:
593: cpy (buf + sizeof (buf) - bufp, bufp);
594: break;
595:
596:
597: case 'H':
598: if (modifier == 'E')
599: goto bad_format;
600:
601: DO_NUMBER (2, tp->tm_hour);
602:
603: case 'I':
604: if (modifier == 'E')
605: goto bad_format;
606:
607: DO_NUMBER (2, hour12);
608:
609: case 'k': /* GNU extension. */
610: if (modifier == 'E')
611: goto bad_format;
612:
613: DO_NUMBER_SPACEPAD (2, tp->tm_hour);
614:
615: case 'l': /* GNU extension. */
616: if (modifier == 'E')
617: goto bad_format;
618:
619: DO_NUMBER_SPACEPAD (2, hour12);
620:
621: case 'j':
622: if (modifier == 'E')
623: goto bad_format;
624:
625: DO_NUMBER (3, 1 + tp->tm_yday);
626:
627: case 'M':
628: if (modifier == 'E')
629: goto bad_format;
630:
631: DO_NUMBER (2, tp->tm_min);
632:
633: case 'm':
634: if (modifier == 'E')
635: goto bad_format;
636:
637: DO_NUMBER (2, tp->tm_mon + 1);
638:
639: case 'n': /* POSIX.2 extension. */
640: add (1, *p = '\n');
641: break;
642:
643: case 'p':
644: cpy (ap_len, ampm);
645: break;
646:
647: case 'R': /* GNU extension. */
648: subfmt = "%H:%M";
649: goto subformat;
650:
651: case 'r': /* POSIX.2 extension. */
652: #ifdef _NL_CURRENT
653: if (*(subfmt = _NL_CURRENT (LC_TIME, T_FMT_AMPM)) == '\0')
654: #endif
655: subfmt = "%I:%M:%S %p";
656: goto subformat;
657:
658: case 'S':
659: if (modifier == 'E')
660: goto bad_format;
661:
662: DO_NUMBER (2, tp->tm_sec);
663:
664: case 's': /* GNU extension. */
665: {
666: struct tm ltm;
667: time_t t;
668:
669: ltm = *tp;
670: t = mktime (<m);
671:
672: /* Generate string value for T using time_t arithmetic;
673: this works even if sizeof (long) < sizeof (time_t). */
674:
675: bufp = buf + sizeof (buf);
676: negative_number = t < 0;
677:
678: do
679: {
680: int d = t % 10;
681: t /= 10;
682:
683: if (negative_number)
684: {
685: d = -d;
686:
687: /* Adjust if division truncates to minus infinity. */
688: if (0 < -1 % 10 && d < 0)
689: {
690: t++;
691: d += 10;
692: }
693: }
694:
695: *--bufp = d + '0';
696: }
697: while (t != 0);
698:
699: digits = 1;
700: goto do_number_sign_and_padding;
701: }
702:
703: case 'X':
704: if (modifier == 'O')
705: goto bad_format;
706: #ifdef _NL_CURRENT
707: if (! (modifier == 'E'
708: && *(subfmt = _NL_CURRENT (LC_TIME, ERA_T_FMT)) != '\0'))
709: subfmt = _NL_CURRENT (LC_TIME, T_FMT);
710: goto subformat;
711: #endif
712: /* Fall through. */
713: case 'T': /* POSIX.2 extension. */
714: subfmt = "%H:%M:%S";
715: goto subformat;
716:
717: case 't': /* POSIX.2 extension. */
718: add (1, *p = '\t');
719: break;
720:
721: case 'u': /* POSIX.2 extension. */
722: DO_NUMBER (1, (tp->tm_wday - 1 + 7) % 7 + 1);
723:
724: case 'U':
725: if (modifier == 'E')
726: goto bad_format;
727:
728: DO_NUMBER (2, (tp->tm_yday - tp->tm_wday + 7) / 7);
729:
730: case 'V':
731: case 'g': /* GNU extension. */
732: case 'G': /* GNU extension. */
733: if (modifier == 'E')
734: goto bad_format;
735: {
736: int year = tp->tm_year + TM_YEAR_BASE;
737: int days = iso_week_days (tp->tm_yday, tp->tm_wday);
738:
739: if (days < 0)
740: {
741: /* This ISO week belongs to the previous year. */
742: year--;
743: days = iso_week_days (tp->tm_yday + (365 + __isleap (year)),
744: tp->tm_wday);
745: }
746: else
747: {
748: int d = iso_week_days (tp->tm_yday - (365 + __isleap (year)),
749: tp->tm_wday);
750: if (0 <= d)
751: {
752: /* This ISO week belongs to the next year. */
753: year++;
754: days = d;
755: }
756: }
757:
758: switch (*f)
759: {
760: case 'g':
761: DO_NUMBER (2, (year % 100 + 100) % 100);
762:
763: case 'G':
764: DO_NUMBER (1, year);
765:
766: default:
767: DO_NUMBER (2, days / 7 + 1);
768: }
769: }
770:
771: case 'W':
772: if (modifier == 'E')
773: goto bad_format;
774:
775: DO_NUMBER (2, (tp->tm_yday - (tp->tm_wday - 1 + 7) % 7 + 7) / 7);
776:
777: case 'w':
778: if (modifier == 'E')
779: goto bad_format;
780:
781: DO_NUMBER (1, tp->tm_wday);
782:
783: case 'Y':
784: #if HAVE_STRUCT_ERA_ENTRY
785: if (modifier == 'E')
786: {
787: struct era_entry *era = _nl_get_era_entry (tp);
788: if (era)
789: {
790: subfmt = strchr (era->name_fmt, '\0') + 1;
791: goto subformat;
792: }
793: }
794: #endif
795: if (modifier == 'O')
796: goto bad_format;
797: else
798: DO_NUMBER (1, tp->tm_year + TM_YEAR_BASE);
799:
800: case 'y':
801: #if HAVE_STRUCT_ERA_ENTRY
802: if (modifier == 'E')
803: {
804: struct era_entry *era = _nl_get_era_entry (tp);
805: if (era)
806: {
807: int delta = tp->tm_year - era->start_date[0];
808: DO_NUMBER (1, (era->offset
809: + (era->direction == '-' ? -delta : delta)));
810: }
811: }
812: #endif
813: DO_NUMBER (2, (tp->tm_year % 100 + 100) % 100);
814:
815: case 'Z':
816: cpy (zonelen, zone);
817: break;
818:
819: case 'z': /* GNU extension. */
820: if (tp->tm_isdst < 0)
821: break;
822:
823: {
824: int diff;
825: #if HAVE_TM_GMTOFF
826: diff = tp->tm_gmtoff;
827: #else
828: struct tm gtm;
829: struct tm ltm;
830: time_t lt;
831:
832: ltm = *tp;
833: lt = mktime (<m);
834:
835: if (lt == (time_t) -1)
836: {
837: /* mktime returns -1 for errors, but -1 is also a
838: valid time_t value. Check whether an error really
839: occurred. */
840: struct tm tm;
841: localtime_r (<, &tm);
842:
843: if ((ltm.tm_sec ^ tm.tm_sec)
844: | (ltm.tm_min ^ tm.tm_min)
845: | (ltm.tm_hour ^ tm.tm_hour)
846: | (ltm.tm_mday ^ tm.tm_mday)
847: | (ltm.tm_mon ^ tm.tm_mon)
848: | (ltm.tm_year ^ tm.tm_year))
849: break;
850: }
851:
852: if (! gmtime_r (<, >m))
853: break;
854:
855: diff = tm_diff (<m, >m);
856: #endif
857:
858: if (diff < 0)
859: {
860: add (1, *p = '-');
861: diff = -diff;
862: }
863: else
864: add (1, *p = '+');
865:
866: diff /= 60;
867: DO_NUMBER (4, (diff / 60) * 100 + diff % 60);
868: }
869:
870: case '\0': /* GNU extension: % at end of format. */
871: --f;
872: /* Fall through. */
873: default:
874: /* Unknown format; output the format, including the '%',
875: since this is most likely the right thing to do if a
876: multibyte string has been misparsed. */
877: bad_format:
878: {
879: int flen;
880: for (flen = 1; f[1 - flen] != '%'; flen++)
881: continue;
882: cpy (flen, &f[1 - flen]);
883: }
884: break;
885: }
886: }
887:
888: if (p)
889: *p = '\0';
890: return i;
891: }
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