1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #ifdef LIBC_RCS 19 static const char rcsid[] = 20 "$Id: strftime.c,v 1.5 1995/08/07 23:35:41 ache Exp $"; 21 #endif 22 23 #ifndef lint 24 #ifndef NOID 25 static const char elsieid[] = "@(#)strftime.c 7.38"; 26 /* 27 ** Based on the UCB version with the ID appearing below. 28 ** This is ANSIish only when "multibyte character == plain character". 29 */ 30 #endif /* !defined NOID */ 31 #endif /* !defined lint */ 32 33 #include "private.h" 34 35 #ifndef LIBC_SCCS 36 #ifndef lint 37 static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89"; 38 #endif /* !defined lint */ 39 #endif /* !defined LIBC_SCCS */ 40 41 #include "tzfile.h" 42 #include <fcntl.h> 43 #include <locale.h> 44 #include <rune.h> /* for _PATH_LOCALE */ 45 #include <sys/stat.h> 46 47 #define LOCALE_HOME _PATH_LOCALE 48 49 struct lc_time_T { 50 const char * mon[12]; 51 const char * month[12]; 52 const char * wday[7]; 53 const char * weekday[7]; 54 const char * X_fmt; 55 const char * x_fmt; 56 const char * c_fmt; 57 const char * am; 58 const char * pm; 59 const char * date_fmt; 60 }; 61 62 static struct lc_time_T localebuf; 63 static struct lc_time_T * _loc P((void)); 64 static int using_locale; 65 66 #define Locale (using_locale ? &localebuf : &C_time_locale) 67 68 static const struct lc_time_T C_time_locale = { 69 { 70 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 71 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 72 }, { 73 "January", "February", "March", "April", "May", "June", 74 "July", "August", "September", "October", "November", "December" 75 }, { 76 "Sun", "Mon", "Tue", "Wed", 77 "Thu", "Fri", "Sat" 78 }, { 79 "Sunday", "Monday", "Tuesday", "Wednesday", 80 "Thursday", "Friday", "Saturday" 81 }, 82 83 /* X_fmt */ 84 "%H:%M:%S", 85 86 /* 87 ** x_fmt 88 ** Since the C language standard calls for 89 ** "date, using locale's date format," anything goes. 90 ** Using just numbers (as here) makes Quakers happier; 91 ** it's also compatible with SVR4. 92 */ 93 "%m/%d/%y", 94 95 /* 96 ** c_fmt (ctime-compatible) 97 ** Note that 98 ** "%a %b %d %H:%M:%S %Y" 99 ** is used by Solaris 2.3. 100 */ 101 "%a %b %e %X %Y", 102 103 /* am */ 104 "AM", 105 106 /* pm */ 107 "PM", 108 109 /* date_fmt */ 110 "%a %b %e %X %Z %Y" 111 }; 112 113 static char * _add P((const char *, char *, const char *)); 114 static char * _conv P((int, const char *, char *, const char *)); 115 static char * _fmt P((const char *, const struct tm *, char *, const char *)); 116 static char * _secs P((const struct tm *, char *, const char *)); 117 118 size_t strftime P((char *, size_t, const char *, const struct tm *)); 119 120 extern char * tzname[]; 121 122 size_t 123 strftime(s, maxsize, format, t) 124 char *const s; 125 const size_t maxsize; 126 const char *const format; 127 const struct tm *const t; 128 { 129 char *p; 130 131 tzset(); 132 p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize); 133 if (p == s + maxsize) 134 return 0; 135 *p = '\0'; 136 return p - s; 137 } 138 139 static char * 140 _fmt(format, t, pt, ptlim) 141 const char *format; 142 const struct tm *const t; 143 char *pt; 144 const char *const ptlim; 145 { 146 for ( ; *format; ++format) { 147 if (*format == '%') { 148 label: 149 switch (*++format) { 150 case '\0': 151 --format; 152 break; 153 case 'A': 154 pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? 155 "?" : Locale->weekday[t->tm_wday], 156 pt, ptlim); 157 continue; 158 case 'a': 159 pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? 160 "?" : Locale->wday[t->tm_wday], 161 pt, ptlim); 162 continue; 163 case 'B': 164 pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? 165 "?" : Locale->month[t->tm_mon], 166 pt, ptlim); 167 continue; 168 case 'b': 169 case 'h': 170 pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? 171 "?" : Locale->mon[t->tm_mon], 172 pt, ptlim); 173 continue; 174 case 'C': 175 /* 176 ** %C used to do a... 177 ** _fmt("%a %b %e %X %Y", t); 178 ** ...whereas now POSIX 1003.2 calls for 179 ** something completely different. 180 ** (ado, 5/24/93) 181 */ 182 pt = _conv((t->tm_year + TM_YEAR_BASE) / 100, 183 "%02d", pt, ptlim); 184 continue; 185 case 'c': 186 pt = _fmt(Locale->c_fmt, t, pt, ptlim); 187 continue; 188 case 'D': 189 pt = _fmt("%m/%d/%y", t, pt, ptlim); 190 continue; 191 case 'd': 192 pt = _conv(t->tm_mday, "%02d", pt, ptlim); 193 continue; 194 case 'E': 195 case 'O': 196 /* 197 ** POSIX locale extensions, a la 198 ** Arnold Robbins' strftime version 3.0. 199 ** The sequences 200 ** %Ec %EC %Ex %Ey %EY 201 ** %Od %oe %OH %OI %Om %OM 202 ** %OS %Ou %OU %OV %Ow %OW %Oy 203 ** are supposed to provide alternate 204 ** representations. 205 ** (ado, 5/24/93) 206 */ 207 goto label; 208 case 'e': 209 pt = _conv(t->tm_mday, "%2d", pt, ptlim); 210 continue; 211 case 'H': 212 pt = _conv(t->tm_hour, "%02d", pt, ptlim); 213 continue; 214 case 'I': 215 pt = _conv((t->tm_hour % 12) ? 216 (t->tm_hour % 12) : 12, 217 "%02d", pt, ptlim); 218 continue; 219 case 'j': 220 pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim); 221 continue; 222 case 'k': 223 /* 224 ** This used to be... 225 ** _conv(t->tm_hour % 12 ? 226 ** t->tm_hour % 12 : 12, 2, ' '); 227 ** ...and has been changed to the below to 228 ** match SunOS 4.1.1 and Arnold Robbins' 229 ** strftime version 3.0. That is, "%k" and 230 ** "%l" have been swapped. 231 ** (ado, 5/24/93) 232 */ 233 pt = _conv(t->tm_hour, "%2d", pt, ptlim); 234 continue; 235 #ifdef KITCHEN_SINK 236 case 'K': 237 /* 238 ** After all this time, still unclaimed! 239 */ 240 pt = _add("kitchen sink", pt, ptlim); 241 continue; 242 #endif /* defined KITCHEN_SINK */ 243 case 'l': 244 /* 245 ** This used to be... 246 ** _conv(t->tm_hour, 2, ' '); 247 ** ...and has been changed to the below to 248 ** match SunOS 4.1.1 and Arnold Robbin's 249 ** strftime version 3.0. That is, "%k" and 250 ** "%l" have been swapped. 251 ** (ado, 5/24/93) 252 */ 253 pt = _conv((t->tm_hour % 12) ? 254 (t->tm_hour % 12) : 12, 255 "%2d", pt, ptlim); 256 continue; 257 case 'M': 258 pt = _conv(t->tm_min, "%02d", pt, ptlim); 259 continue; 260 case 'm': 261 pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim); 262 continue; 263 case 'n': 264 pt = _add("\n", pt, ptlim); 265 continue; 266 case 'p': 267 pt = _add((t->tm_hour >= 12) ? 268 Locale->pm : 269 Locale->am, 270 pt, ptlim); 271 continue; 272 case 'R': 273 pt = _fmt("%H:%M", t, pt, ptlim); 274 continue; 275 case 'r': 276 pt = _fmt("%I:%M:%S %p", t, pt, ptlim); 277 continue; 278 case 'S': 279 pt = _conv(t->tm_sec, "%02d", pt, ptlim); 280 continue; 281 case 's': 282 pt = _secs(t, pt, ptlim); 283 continue; 284 case 'T': 285 pt = _fmt("%H:%M:%S", t, pt, ptlim); 286 continue; 287 case 't': 288 pt = _add("\t", pt, ptlim); 289 continue; 290 case 'U': 291 pt = _conv((t->tm_yday + 7 - t->tm_wday) / 7, 292 "%02d", pt, ptlim); 293 continue; 294 case 'u': 295 /* 296 ** From Arnold Robbins' strftime version 3.0: 297 ** "ISO 8601: Weekday as a decimal number 298 ** [1 (Monday) - 7]" 299 ** (ado, 5/24/93) 300 */ 301 pt = _conv((t->tm_wday == 0) ? 7 : t->tm_wday, 302 "%d", pt, ptlim); 303 continue; 304 case 'V': 305 /* 306 ** From Arnold Robbins' strftime version 3.0: 307 ** "the week number of the year (the first 308 ** Monday as the first day of week 1) as a 309 ** decimal number (01-53). The method for 310 ** determining the week number is as specified 311 ** by ISO 8601 (to wit: if the week containing 312 ** January 1 has four or more days in the new 313 ** year, then it is week 1, otherwise it is 314 ** week 53 of the previous year and the next 315 ** week is week 1)." 316 ** (ado, 5/24/93) 317 */ 318 /* 319 ** XXX--If January 1 falls on a Friday, 320 ** January 1-3 are part of week 53 of the 321 ** previous year. By analogy, if January 322 ** 1 falls on a Thursday, are December 29-31 323 ** of the PREVIOUS year part of week 1??? 324 ** (ado 5/24/93) 325 */ 326 /* 327 ** You are understood not to expect this. 328 */ 329 { 330 int i; 331 332 i = (t->tm_yday + 10 - (t->tm_wday ? 333 (t->tm_wday - 1) : 6)) / 7; 334 if (i == 0) { 335 /* 336 ** What day of the week does 337 ** January 1 fall on? 338 */ 339 i = t->tm_wday - 340 (t->tm_yday - 1); 341 /* 342 ** Fri Jan 1: 53 343 ** Sun Jan 1: 52 344 ** Sat Jan 1: 53 if previous 345 ** year a leap 346 ** year, else 52 347 */ 348 if (i == TM_FRIDAY) 349 i = 53; 350 else if (i == TM_SUNDAY) 351 i = 52; 352 else i = isleap(t->tm_year + 353 TM_YEAR_BASE) ? 354 53 : 52; 355 #ifdef XPG4_1994_04_09 356 /* 357 ** As of 4/9/94, though, 358 ** XPG4 calls for 53 359 ** unconditionally. 360 */ 361 i = 53; 362 #endif /* defined XPG4_1994_04_09 */ 363 } 364 pt = _conv(i, "%02d", pt, ptlim); 365 } 366 continue; 367 case 'v': 368 /* 369 ** From Arnold Robbins' strftime version 3.0: 370 ** "date as dd-bbb-YYYY" 371 ** (ado, 5/24/93) 372 */ 373 pt = _fmt("%e-%b-%Y", t, pt, ptlim); 374 continue; 375 case 'W': 376 pt = _conv((t->tm_yday + 7 - 377 (t->tm_wday ? 378 (t->tm_wday - 1) : 6)) / 7, 379 "%02d", pt, ptlim); 380 continue; 381 case 'w': 382 pt = _conv(t->tm_wday, "%d", pt, ptlim); 383 continue; 384 case 'X': 385 pt = _fmt(Locale->X_fmt, t, pt, ptlim); 386 continue; 387 case 'x': 388 pt = _fmt(Locale->x_fmt, t, pt, ptlim); 389 continue; 390 case 'y': 391 pt = _conv((t->tm_year + TM_YEAR_BASE) % 100, 392 "%02d", pt, ptlim); 393 continue; 394 case 'Y': 395 pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d", 396 pt, ptlim); 397 continue; 398 case 'Z': 399 if (t->tm_zone != NULL) 400 pt = _add(t->tm_zone, pt, ptlim); 401 else 402 if (t->tm_isdst == 0 || t->tm_isdst == 1) { 403 pt = _add(tzname[t->tm_isdst], 404 pt, ptlim); 405 } else pt = _add("?", pt, ptlim); 406 continue; 407 case '+': 408 pt = _fmt(Locale->date_fmt, t, pt, ptlim); 409 continue; 410 case '%': 411 /* 412 * X311J/88-090 (4.12.3.5): if conversion char is 413 * undefined, behavior is undefined. Print out the 414 * character itself as printf(3) also does. 415 */ 416 default: 417 break; 418 } 419 } 420 if (pt == ptlim) 421 break; 422 *pt++ = *format; 423 } 424 return pt; 425 } 426 427 static char * 428 _conv(n, format, pt, ptlim) 429 const int n; 430 const char *const format; 431 char *const pt; 432 const char *const ptlim; 433 { 434 char buf[INT_STRLEN_MAXIMUM(int) + 1]; 435 436 (void) sprintf(buf, format, n); 437 return _add(buf, pt, ptlim); 438 } 439 440 static char * 441 _secs(t, pt, ptlim) 442 const struct tm *t; 443 char *pt; 444 const char *ptlim; 445 { 446 char buf[INT_STRLEN_MAXIMUM(int) + 1]; 447 register time_t s; 448 struct tm tmp; 449 450 /* Make a copy, mktime(3) modifies the tm struct. */ 451 tmp = *t; 452 s = mktime(&tmp); 453 (void) sprintf(buf, "%ld", s); 454 return _add(buf, pt, ptlim); 455 } 456 457 static char * 458 _add(str, pt, ptlim) 459 const char *str; 460 char *pt; 461 const char *const ptlim; 462 { 463 while (pt < ptlim && (*pt = *str++) != '\0') 464 ++pt; 465 return pt; 466 } 467 468 extern char *_PathLocale; 469 470 int 471 __time_load_locale(const char *name) 472 { 473 static const char lc_time[] = "LC_TIME"; 474 static char * locale_buf; 475 static char locale_buf_C[] = "C"; 476 477 int fd; 478 char * lbuf; 479 char * p; 480 const char ** ap; 481 const char * plim; 482 char filename[FILENAME_MAX]; 483 struct stat st; 484 size_t namesize; 485 size_t bufsize; 486 int save_using_locale; 487 488 save_using_locale = using_locale; 489 using_locale = 0; 490 491 if (name == NULL) 492 goto no_locale; 493 494 if (!*name || !strcmp(name, "C") || !strcmp(name, "POSIX")) 495 return 0; 496 497 /* 498 ** If the locale name is the same as our cache, use the cache. 499 */ 500 lbuf = locale_buf; 501 if (lbuf != NULL && strcmp(name, lbuf) == 0) { 502 p = lbuf; 503 for (ap = (const char **) &localebuf; 504 ap < (const char **) (&localebuf + 1); 505 ++ap) 506 *ap = p += strlen(p) + 1; 507 using_locale = 1; 508 return 0; 509 } 510 /* 511 ** Slurp the locale file into the cache. 512 */ 513 namesize = strlen(name) + 1; 514 515 snprintf(filename, sizeof filename, 516 "%s/%s/%s", 517 _PathLocale, name, lc_time); 518 fd = open(filename, O_RDONLY); 519 if (fd < 0) 520 goto no_locale; 521 if (fstat(fd, &st) != 0) 522 goto bad_locale; 523 if (st.st_size <= 0) 524 goto bad_locale; 525 bufsize = namesize + st.st_size; 526 locale_buf = NULL; 527 lbuf = (lbuf == NULL || lbuf == locale_buf_C) ? 528 malloc(bufsize) : realloc(lbuf, bufsize); 529 if (lbuf == NULL) 530 goto bad_locale; 531 (void) strcpy(lbuf, name); 532 p = lbuf + namesize; 533 plim = p + st.st_size; 534 if (read(fd, p, (size_t) st.st_size) != st.st_size) 535 goto bad_lbuf; 536 if (close(fd) != 0) 537 goto bad_lbuf; 538 /* 539 ** Parse the locale file into localebuf. 540 */ 541 if (plim[-1] != '\n') 542 goto bad_lbuf; 543 for (ap = (const char **) &localebuf; 544 ap < (const char **) (&localebuf + 1); 545 ++ap) { 546 if (p == plim) 547 goto reset_locale; 548 *ap = p; 549 while (*p != '\n') 550 ++p; 551 *p++ = '\0'; 552 } 553 /* 554 ** Record the successful parse in the cache. 555 */ 556 locale_buf = lbuf; 557 558 using_locale = 1; 559 return 0; 560 561 reset_locale: 562 /* 563 * XXX - This may not be the correct thing to do in this case. 564 * setlocale() assumes that we left the old locale alone. 565 */ 566 locale_buf = locale_buf_C; 567 localebuf = C_time_locale; 568 save_using_locale = 0; 569 bad_lbuf: 570 free(lbuf); 571 bad_locale: 572 (void) close(fd); 573 no_locale: 574 using_locale = save_using_locale; 575 return -1; 576 } 577