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 1.9 1996/07/12 18:55:32 jkh 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 int using_locale; 64 65 #define Locale (using_locale ? &localebuf : &C_time_locale) 66 67 static const struct lc_time_T C_time_locale = { 68 { 69 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 70 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 71 }, { 72 "January", "February", "March", "April", "May", "June", 73 "July", "August", "September", "October", "November", "December" 74 }, { 75 "Sun", "Mon", "Tue", "Wed", 76 "Thu", "Fri", "Sat" 77 }, { 78 "Sunday", "Monday", "Tuesday", "Wednesday", 79 "Thursday", "Friday", "Saturday" 80 }, 81 82 /* X_fmt */ 83 "%H:%M:%S", 84 85 /* 86 ** x_fmt 87 ** Since the C language standard calls for 88 ** "date, using locale's date format," anything goes. 89 ** Using just numbers (as here) makes Quakers happier; 90 ** it's also compatible with SVR4. 91 */ 92 "%m/%d/%y", 93 94 /* 95 ** c_fmt (ctime-compatible) 96 ** Note that 97 ** "%a %b %d %H:%M:%S %Y" 98 ** is used by Solaris 2.3. 99 */ 100 "%a %b %e %X %Y", 101 102 /* am */ 103 "AM", 104 105 /* pm */ 106 "PM", 107 108 /* date_fmt */ 109 "%a %b %e %X %Z %Y" 110 }; 111 112 static char * _add P((const char *, char *, const char *)); 113 static char * _conv P((int, const char *, char *, const char *)); 114 static char * _fmt P((const char *, const struct tm *, char *, const char *)); 115 static char * _secs P((const struct tm *, char *, const char *)); 116 117 size_t strftime P((char *, size_t, const char *, const struct tm *)); 118 119 extern char * tzname[]; 120 121 size_t 122 strftime(s, maxsize, format, t) 123 char *const s; 124 const size_t maxsize; 125 const char *const format; 126 const struct tm *const t; 127 { 128 char *p; 129 130 tzset(); 131 p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize); 132 if (p == s + maxsize) 133 return 0; 134 *p = '\0'; 135 return p - s; 136 } 137 138 static char * 139 _fmt(format, t, pt, ptlim) 140 const char *format; 141 const struct tm *const t; 142 char *pt; 143 const char *const ptlim; 144 { 145 for ( ; *format; ++format) { 146 if (*format == '%') { 147 label: 148 switch (*++format) { 149 case '\0': 150 --format; 151 break; 152 case 'A': 153 pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? 154 "?" : Locale->weekday[t->tm_wday], 155 pt, ptlim); 156 continue; 157 case 'a': 158 pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? 159 "?" : Locale->wday[t->tm_wday], 160 pt, ptlim); 161 continue; 162 case 'B': 163 pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? 164 "?" : Locale->month[t->tm_mon], 165 pt, ptlim); 166 continue; 167 case 'b': 168 case 'h': 169 pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? 170 "?" : Locale->mon[t->tm_mon], 171 pt, ptlim); 172 continue; 173 case 'C': 174 /* 175 ** %C used to do a... 176 ** _fmt("%a %b %e %X %Y", t); 177 ** ...whereas now POSIX 1003.2 calls for 178 ** something completely different. 179 ** (ado, 5/24/93) 180 */ 181 pt = _conv((t->tm_year + TM_YEAR_BASE) / 100, 182 "%02d", pt, ptlim); 183 continue; 184 case 'c': 185 pt = _fmt(Locale->c_fmt, t, pt, ptlim); 186 continue; 187 case 'D': 188 pt = _fmt("%m/%d/%y", t, pt, ptlim); 189 continue; 190 case 'd': 191 pt = _conv(t->tm_mday, "%02d", pt, ptlim); 192 continue; 193 case 'E': 194 case 'O': 195 /* 196 ** POSIX locale extensions, a la 197 ** Arnold Robbins' strftime version 3.0. 198 ** The sequences 199 ** %Ec %EC %Ex %Ey %EY 200 ** %Od %oe %OH %OI %Om %OM 201 ** %OS %Ou %OU %OV %Ow %OW %Oy 202 ** are supposed to provide alternate 203 ** representations. 204 ** (ado, 5/24/93) 205 */ 206 goto label; 207 case 'e': 208 pt = _conv(t->tm_mday, "%2d", pt, ptlim); 209 continue; 210 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 } 425 426 static 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 } 438 439 static 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 } 455 456 static 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 } 466 467 extern char *_PathLocale; 468 469 int 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; 559 560 reset_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; 568 bad_lbuf: 569 free(lbuf); 570 bad_locale: 571 (void) close(fd); 572 no_locale: 573 using_locale = save_using_locale; 574 return -1; 575 } 576