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