strftime.c revision 17141
1107120Sjulian/* 2107120Sjulian * Copyright (c) 1989 The Regents of the University of California. 3139823Simp * All rights reserved. 4139823Simp * 5139823Simp * Redistribution and use in source and binary forms are permitted 6107120Sjulian * provided that the above copyright notice and this paragraph are 7107120Sjulian * duplicated in all such forms and that any documentation, 8107120Sjulian * advertising materials, and other materials related to such 9107120Sjulian * distribution and use acknowledge that the software was developed 10107120Sjulian * by the University of California, Berkeley. The name of the 11107120Sjulian * University may not be used to endorse or promote products derived 12107120Sjulian * from this software without specific prior written permission. 13107120Sjulian * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14107120Sjulian * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15107120Sjulian * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16107120Sjulian */ 17107120Sjulian 18107120Sjulian#ifdef LIBC_RCS 19107120Sjulianstatic const char rcsid[] = 20107120Sjulian "$Id: strftime.c,v 1.8 1996/05/27 06:54:01 scrappy Exp $"; 21107120Sjulian#endif 22107120Sjulian 23107120Sjulian#ifndef lint 24107120Sjulian#ifndef NOID 25107120Sjulianstatic const char elsieid[] = "@(#)strftime.c 7.38"; 26107120Sjulian/* 27107120Sjulian** Based on the UCB version with the ID appearing below. 28107120Sjulian** This is ANSIish only when "multibyte character == plain character". 29107120Sjulian*/ 30114878Sjulian#endif /* !defined NOID */ 31107120Sjulian#endif /* !defined lint */ 32107120Sjulian 33107120Sjulian#include "private.h" 34107120Sjulian 35122634Semax#ifndef LIBC_SCCS 36107120Sjulian#ifndef lint 37107120Sjulianstatic const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89"; 38107120Sjulian#endif /* !defined lint */ 39107120Sjulian#endif /* !defined LIBC_SCCS */ 40107120Sjulian 41107120Sjulian#include "tzfile.h" 42107120Sjulian#include <fcntl.h> 43107120Sjulian#include <locale.h> 44107120Sjulian#include <rune.h> /* for _PATH_LOCALE */ 45107120Sjulian#include <sys/stat.h> 46107120Sjulian 47114878Sjulian#define LOCALE_HOME _PATH_LOCALE 48107120Sjulian 49107120Sjulianstruct lc_time_T { 50107120Sjulian const char * mon[12]; 51107120Sjulian const char * month[12]; 52107120Sjulian const char * wday[7]; 53107120Sjulian const char * weekday[7]; 54107120Sjulian const char * X_fmt; 55107120Sjulian const char * x_fmt; 56107120Sjulian const char * c_fmt; 57107120Sjulian const char * am; 58107120Sjulian const char * pm; 59107120Sjulian const char * date_fmt; 60107120Sjulian}; 61107120Sjulian 62107120Sjulianstatic struct lc_time_T localebuf; 63107120Sjulianstatic int using_locale; 64107120Sjulian 65107120Sjulian#define Locale (using_locale ? &localebuf : &C_time_locale) 66107120Sjulian 67107120Sjulianstatic const struct lc_time_T C_time_locale = { 68114878Sjulian { 69114878Sjulian "Jan", "Feb", "Mar", "Apr", "May", "Jun", 70114878Sjulian "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 71107120Sjulian }, { 72114878Sjulian "January", "February", "March", "April", "May", "June", 73107120Sjulian "July", "August", "September", "October", "November", "December" 74107120Sjulian }, { 75107120Sjulian "Sun", "Mon", "Tue", "Wed", 76107120Sjulian "Thu", "Fri", "Sat" 77107120Sjulian }, { 78114878Sjulian "Sunday", "Monday", "Tuesday", "Wednesday", 79114878Sjulian "Thursday", "Friday", "Saturday" 80107120Sjulian }, 81107120Sjulian 82107120Sjulian /* X_fmt */ 83107120Sjulian "%H:%M:%S", 84107120Sjulian 85107120Sjulian /* 86107120Sjulian ** x_fmt 87107120Sjulian ** Since the C language standard calls for 88107120Sjulian ** "date, using locale's date format," anything goes. 89107120Sjulian ** Using just numbers (as here) makes Quakers happier; 90107120Sjulian ** it's also compatible with SVR4. 91107120Sjulian */ 92107120Sjulian "%m/%d/%y", 93107120Sjulian 94107120Sjulian /* 95157366Srwatson ** c_fmt (ctime-compatible) 96160549Srwatson ** Note that 97107120Sjulian ** "%a %b %d %H:%M:%S %Y" 98107120Sjulian ** is used by Solaris 2.3. 99107120Sjulian */ 100107120Sjulian "%a %b %e %X %Y", 101107120Sjulian 102107120Sjulian /* am */ 103107120Sjulian "AM", 104157370Srwatson 105107120Sjulian /* pm */ 106107120Sjulian "PM", 107107120Sjulian 108107120Sjulian /* date_fmt */ 109107120Sjulian "%a %b %e %X %Z %Y" 110107120Sjulian}; 111107120Sjulian 112107120Sjulianstatic char * _add P((const char *, char *, const char *)); 113107120Sjulianstatic char * _conv P((int, const char *, char *, const char *)); 114107120Sjulianstatic char * _fmt P((const char *, const struct tm *, char *, const char *)); 115107120Sjulianstatic char * _secs P((const struct tm *, char *, const char *)); 116107120Sjulian 117107120Sjuliansize_t strftime P((char *, size_t, const char *, const struct tm *)); 118107120Sjulian 119107120Sjulianextern char * tzname[]; 120107120Sjulian 121107120Sjuliansize_t 122107120Sjulianstrftime(s, maxsize, format, t) 123107120Sjulian char *const s; 124107120Sjulian const size_t maxsize; 125107120Sjulian const char *const format; 126107120Sjulian const struct tm *const t; 127107120Sjulian{ 128107120Sjulian char *p; 129107120Sjulian 130107120Sjulian tzset(); 131107120Sjulian p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize); 132107120Sjulian if (p == s + maxsize) 133107120Sjulian return 0; 134107120Sjulian *p = '\0'; 135107120Sjulian return p - s; 136107120Sjulian} 137107120Sjulian 138107120Sjulianstatic char * 139107120Sjulian_fmt(format, t, pt, ptlim) 140107120Sjulian const char *format; 141107120Sjulian const struct tm *const t; 142107120Sjulian char *pt; 143107120Sjulian const char *const ptlim; 144107120Sjulian{ 145107120Sjulian for ( ; *format; ++format) { 146107120Sjulian if (*format == '%') { 147107120Sjulianlabel: 148107120Sjulian switch (*++format) { 149107120Sjulian case '\0': 150107120Sjulian --format; 151107120Sjulian break; 152107120Sjulian case 'A': 153107120Sjulian pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? 154107120Sjulian "?" : Locale->weekday[t->tm_wday], 155107120Sjulian pt, ptlim); 156107120Sjulian continue; 157107120Sjulian case 'a': 158107120Sjulian pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? 159107120Sjulian "?" : Locale->wday[t->tm_wday], 160107120Sjulian pt, ptlim); 161107120Sjulian continue; 162107120Sjulian case 'B': 163107120Sjulian pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? 164107120Sjulian "?" : Locale->month[t->tm_mon], 165107120Sjulian pt, ptlim); 166107120Sjulian continue; 167107120Sjulian case 'b': 168107120Sjulian case 'h': 169107120Sjulian pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? 170107120Sjulian "?" : Locale->mon[t->tm_mon], 171107120Sjulian pt, ptlim); 172107120Sjulian continue; 173107120Sjulian case 'C': 174107120Sjulian /* 175107120Sjulian ** %C used to do a... 176107120Sjulian ** _fmt("%a %b %e %X %Y", t); 177107120Sjulian ** ...whereas now POSIX 1003.2 calls for 178107120Sjulian ** something completely different. 179107120Sjulian ** (ado, 5/24/93) 180107120Sjulian */ 181107120Sjulian pt = _conv((t->tm_year + TM_YEAR_BASE) / 100, 182107120Sjulian "%02d", pt, ptlim); 183107120Sjulian continue; 184107120Sjulian case 'c': 185107120Sjulian pt = _fmt(Locale->c_fmt, t, pt, ptlim); 186107120Sjulian continue; 187157366Srwatson case 'D': 188160549Srwatson pt = _fmt("%m/%d/%y", t, pt, ptlim); 189107120Sjulian continue; 190107120Sjulian case 'd': 191107120Sjulian pt = _conv(t->tm_mday, "%02d", pt, ptlim); 192107120Sjulian continue; 193107120Sjulian case 'E': 194107120Sjulian case 'O': 195107120Sjulian /* 196107120Sjulian ** POSIX locale extensions, a la 197107120Sjulian ** Arnold Robbins' strftime version 3.0. 198157370Srwatson ** The sequences 199107120Sjulian ** %Ec %EC %Ex %Ey %EY 200151888Srwatson ** %Od %oe %OH %OI %Om %OM 201107120Sjulian ** %OS %Ou %OU %OV %Ow %OW %Oy 202107120Sjulian ** are supposed to provide alternate 203107120Sjulian ** representations. 204107120Sjulian ** (ado, 5/24/93) 205107120Sjulian */ 206107120Sjulian goto label; 207107120Sjulian case 'e': 208107120Sjulian pt = _conv(t->tm_mday, "%2d", pt, ptlim); 209107120Sjulian continue; 210107120Sjulian case 'H': 211 pt = _conv(t->tm_hour, "%02d", pt, ptlim); 212 continue; 213 case 'I': 214 pt = _conv((t->tm_hour % 12) ? 215 (t->tm_hour % 12) : 12, 216 "%02d", pt, ptlim); 217 continue; 218 case 'j': 219 pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim); 220 continue; 221 case 'k': 222 /* 223 ** This used to be... 224 ** _conv(t->tm_hour % 12 ? 225 ** t->tm_hour % 12 : 12, 2, ' '); 226 ** ...and has been changed to the below to 227 ** match SunOS 4.1.1 and Arnold Robbins' 228 ** strftime version 3.0. That is, "%k" and 229 ** "%l" have been swapped. 230 ** (ado, 5/24/93) 231 */ 232 pt = _conv(t->tm_hour, "%2d", pt, ptlim); 233 continue; 234#ifdef KITCHEN_SINK 235 case 'K': 236 /* 237 ** After all this time, still unclaimed! 238 */ 239 pt = _add("kitchen sink", pt, ptlim); 240 continue; 241#endif /* defined KITCHEN_SINK */ 242 case 'l': 243 /* 244 ** This used to be... 245 ** _conv(t->tm_hour, 2, ' '); 246 ** ...and has been changed to the below to 247 ** match SunOS 4.1.1 and Arnold Robbin's 248 ** strftime version 3.0. That is, "%k" and 249 ** "%l" have been swapped. 250 ** (ado, 5/24/93) 251 */ 252 pt = _conv((t->tm_hour % 12) ? 253 (t->tm_hour % 12) : 12, 254 "%2d", pt, ptlim); 255 continue; 256 case 'M': 257 pt = _conv(t->tm_min, "%02d", pt, ptlim); 258 continue; 259 case 'm': 260 pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim); 261 continue; 262 case 'n': 263 pt = _add("\n", pt, ptlim); 264 continue; 265 case 'p': 266 pt = _add((t->tm_hour >= 12) ? 267 Locale->pm : 268 Locale->am, 269 pt, ptlim); 270 continue; 271 case 'R': 272 pt = _fmt("%H:%M", t, pt, ptlim); 273 continue; 274 case 'r': 275 pt = _fmt("%I:%M:%S %p", t, pt, ptlim); 276 continue; 277 case 'S': 278 pt = _conv(t->tm_sec, "%02d", pt, ptlim); 279 continue; 280 case 's': 281 pt = _secs(t, pt, ptlim); 282 continue; 283 case 'T': 284 pt = _fmt("%H:%M:%S", t, pt, ptlim); 285 continue; 286 case 't': 287 pt = _add("\t", pt, ptlim); 288 continue; 289 case 'U': 290 pt = _conv((t->tm_yday + 7 - t->tm_wday) / 7, 291 "%02d", pt, ptlim); 292 continue; 293 case 'u': 294 /* 295 ** From Arnold Robbins' strftime version 3.0: 296 ** "ISO 8601: Weekday as a decimal number 297 ** [1 (Monday) - 7]" 298 ** (ado, 5/24/93) 299 */ 300 pt = _conv((t->tm_wday == 0) ? 7 : t->tm_wday, 301 "%d", pt, ptlim); 302 continue; 303 case 'V': 304 /* 305 ** From Arnold Robbins' strftime version 3.0: 306 ** "the week number of the year (the first 307 ** Monday as the first day of week 1) as a 308 ** decimal number (01-53). The method for 309 ** determining the week number is as specified 310 ** by ISO 8601 (to wit: if the week containing 311 ** January 1 has four or more days in the new 312 ** year, then it is week 1, otherwise it is 313 ** week 53 of the previous year and the next 314 ** week is week 1)." 315 ** (ado, 5/24/93) 316 */ 317 /* 318 ** XXX--If January 1 falls on a Friday, 319 ** January 1-3 are part of week 53 of the 320 ** previous year. By analogy, if January 321 ** 1 falls on a Thursday, are December 29-31 322 ** of the PREVIOUS year part of week 1??? 323 ** (ado 5/24/93) 324 */ 325 /* 326 ** You are understood not to expect this. 327 */ 328 { 329 int i; 330 331 i = (t->tm_yday + 10 - (t->tm_wday ? 332 (t->tm_wday - 1) : 6)) / 7; 333 if (i == 0) { 334 /* 335 ** What day of the week does 336 ** January 1 fall on? 337 */ 338 i = t->tm_wday - 339 (t->tm_yday - 1); 340 /* 341 ** Fri Jan 1: 53 342 ** Sun Jan 1: 52 343 ** Sat Jan 1: 53 if previous 344 ** year a leap 345 ** year, else 52 346 */ 347 if (i == TM_FRIDAY) 348 i = 53; 349 else if (i == TM_SUNDAY) 350 i = 52; 351 else i = isleap(t->tm_year + 352 TM_YEAR_BASE) ? 353 53 : 52; 354#ifdef XPG4_1994_04_09 355 /* 356 ** As of 4/9/94, though, 357 ** XPG4 calls for 53 358 ** unconditionally. 359 */ 360 i = 53; 361#endif /* defined XPG4_1994_04_09 */ 362 } 363 pt = _conv(i, "%02d", pt, ptlim); 364 } 365 continue; 366 case 'v': 367 /* 368 ** From Arnold Robbins' strftime version 3.0: 369 ** "date as dd-bbb-YYYY" 370 ** (ado, 5/24/93) 371 */ 372 pt = _fmt("%e-%b-%Y", t, pt, ptlim); 373 continue; 374 case 'W': 375 pt = _conv((t->tm_yday + 7 - 376 (t->tm_wday ? 377 (t->tm_wday - 1) : 6)) / 7, 378 "%02d", pt, ptlim); 379 continue; 380 case 'w': 381 pt = _conv(t->tm_wday, "%d", pt, ptlim); 382 continue; 383 case 'X': 384 pt = _fmt(Locale->X_fmt, t, pt, ptlim); 385 continue; 386 case 'x': 387 pt = _fmt(Locale->x_fmt, t, pt, ptlim); 388 continue; 389 case 'y': 390 pt = _conv((t->tm_year + TM_YEAR_BASE) % 100, 391 "%02d", pt, ptlim); 392 continue; 393 case 'Y': 394 pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d", 395 pt, ptlim); 396 continue; 397 case 'Z': 398 if (t->tm_zone != NULL) 399 pt = _add(t->tm_zone, pt, ptlim); 400 else 401 if (t->tm_isdst == 0 || t->tm_isdst == 1) { 402 pt = _add(tzname[t->tm_isdst], 403 pt, ptlim); 404 } else pt = _add("?", pt, ptlim); 405 continue; 406 case '+': 407 pt = _fmt(Locale->date_fmt, t, pt, ptlim); 408 continue; 409 case '%': 410 /* 411 * X311J/88-090 (4.12.3.5): if conversion char is 412 * undefined, behavior is undefined. Print out the 413 * character itself as printf(3) also does. 414 */ 415 default: 416 break; 417 } 418 } 419 if (pt == ptlim) 420 break; 421 *pt++ = *format; 422 } 423 return pt; 424} 425 426static char * 427_conv(n, format, pt, ptlim) 428 const int n; 429 const char *const format; 430 char *const pt; 431 const char *const ptlim; 432{ 433 char buf[INT_STRLEN_MAXIMUM(int) + 1]; 434 435 (void) sprintf(buf, format, n); 436 return _add(buf, pt, ptlim); 437} 438 439static char * 440_secs(t, pt, ptlim) 441 const struct tm *t; 442 char *pt; 443 const char *ptlim; 444{ 445 char buf[INT_STRLEN_MAXIMUM(int) + 1]; 446 register time_t s; 447 struct tm tmp; 448 449 /* Make a copy, mktime(3) modifies the tm struct. */ 450 tmp = *t; 451 s = mktime(&tmp); 452 (void) sprintf(buf, "%ld", s); 453 return _add(buf, pt, ptlim); 454} 455 456static char * 457_add(str, pt, ptlim) 458 const char *str; 459 char *pt; 460 const char *const ptlim; 461{ 462 while (pt < ptlim && (*pt = *str++) != '\0') 463 ++pt; 464 return pt; 465} 466 467extern char *_PathLocale; 468 469int 470__time_load_locale(const char *name) 471{ 472 static const char lc_time[] = "LC_TIME"; 473 static char * locale_buf; 474 static char locale_buf_C[] = "C"; 475 476 int fd; 477 char * lbuf; 478 char * p; 479 const char ** ap; 480 const char * plim; 481 char filename[FILENAME_MAX]; 482 struct stat st; 483 size_t namesize; 484 size_t bufsize; 485 int save_using_locale; 486 487 save_using_locale = using_locale; 488 using_locale = 0; 489 490 if (name == NULL) 491 goto no_locale; 492 493 if (!*name || !strcmp(name, "C") || !strcmp(name, "POSIX")) 494 return 0; 495 496 /* 497 ** If the locale name is the same as our cache, use the cache. 498 */ 499 lbuf = locale_buf; 500 if (lbuf != NULL && strcmp(name, lbuf) == 0) { 501 p = lbuf; 502 for (ap = (const char **) &localebuf; 503 ap < (const char **) (&localebuf + 1); 504 ++ap) 505 *ap = p += strlen(p) + 1; 506 using_locale = 1; 507 return 0; 508 } 509 /* 510 ** Slurp the locale file into the cache. 511 */ 512 namesize = strlen(name) + 1; 513 514 snprintf(filename, sizeof filename, 515 "%s/%s/%s", 516 _PathLocale, name, lc_time); 517 fd = open(filename, O_RDONLY); 518 if (fd < 0) 519 goto no_locale; 520 if (fstat(fd, &st) != 0) 521 goto bad_locale; 522 if (st.st_size <= 0) 523 goto bad_locale; 524 bufsize = namesize + st.st_size; 525 locale_buf = NULL; 526 lbuf = (lbuf == NULL || lbuf == locale_buf_C) ? 527 malloc(bufsize) : realloc(lbuf, bufsize); 528 if (lbuf == NULL) 529 goto bad_locale; 530 (void) strcpy(lbuf, name); 531 p = lbuf + namesize; 532 plim = p + st.st_size; 533 if (read(fd, p, (size_t) st.st_size) != st.st_size) 534 goto bad_lbuf; 535 if (close(fd) != 0) 536 goto bad_lbuf; 537 /* 538 ** Parse the locale file into localebuf. 539 */ 540 if (plim[-1] != '\n') 541 goto bad_lbuf; 542 for (ap = (const char **) &localebuf; 543 ap < (const char **) (&localebuf + 1); 544 ++ap) { 545 if (p == plim) 546 goto reset_locale; 547 *ap = p; 548 while (*p != '\n') 549 ++p; 550 *p++ = '\0'; 551 } 552 /* 553 ** Record the successful parse in the cache. 554 */ 555 locale_buf = lbuf; 556 557 using_locale = 1; 558 return 0; 559 560reset_locale: 561 /* 562 * XXX - This may not be the correct thing to do in this case. 563 * setlocale() assumes that we left the old locale alone. 564 */ 565 locale_buf = locale_buf_C; 566 localebuf = C_time_locale; 567 save_using_locale = 0; 568bad_lbuf: 569 free(lbuf); 570bad_locale: 571 (void) close(fd); 572no_locale: 573 using_locale = save_using_locale; 574 return -1; 575} 576