strftime.c revision 9912
154359Sroberto/* 254359Sroberto * Copyright (c) 1989 The Regents of the University of California. 354359Sroberto * All rights reserved. 454359Sroberto * 554359Sroberto * Redistribution and use in source and binary forms are permitted 654359Sroberto * provided that the above copyright notice and this paragraph are 754359Sroberto * duplicated in all such forms and that any documentation, 8285612Sdelphij * advertising materials, and other materials related to such 954359Sroberto * distribution and use acknowledge that the software was developed 1054359Sroberto * by the University of California, Berkeley. The name of the 1154359Sroberto * University may not be used to endorse or promote products derived 1254359Sroberto * from this software without specific prior written permission. 1354359Sroberto * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 1454359Sroberto * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 1554359Sroberto * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 1654359Sroberto */ 1754359Sroberto 1854359Sroberto#ifdef LIBC_RCS 1954359Srobertostatic const char rcsid[] = 2054359Sroberto "$Id$"; 2154359Sroberto#endif 2254359Sroberto 2354359Sroberto#ifndef lint 2454359Sroberto#ifndef NOID 2554359Srobertostatic const char elsieid[] = "@(#)strftime.c 7.38"; 26285612Sdelphij/* 2754359Sroberto** Based on the UCB version with the ID appearing below. 2854359Sroberto** This is ANSIish only when "multibyte character == plain character". 2954359Sroberto*/ 3054359Sroberto#endif /* !defined NOID */ 3154359Sroberto#endif /* !defined lint */ 3254359Sroberto 3354359Sroberto#include "private.h" 34285612Sdelphij 3554359Sroberto#ifndef LIBC_SCCS 3654359Sroberto#ifndef lint 37285612Sdelphijstatic const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89"; 38285612Sdelphij#endif /* !defined lint */ 39285612Sdelphij#endif /* !defined LIBC_SCCS */ 40285612Sdelphij 41285612Sdelphij#include "tzfile.h" 42285612Sdelphij#include <fcntl.h> 43285612Sdelphij#include <locale.h> 44285612Sdelphij#include <rune.h> /* for _PATH_LOCALE */ 45285612Sdelphij#include <sys/stat.h> 46285612Sdelphij 4754359Sroberto#define LOCALE_HOME _PATH_LOCALE 48285612Sdelphij 49285612Sdelphijstruct lc_time_T { 50285612Sdelphij const char * mon[12]; 51285612Sdelphij const char * month[12]; 52285612Sdelphij const char * wday[7]; 53285612Sdelphij const char * weekday[7]; 54285612Sdelphij const char * X_fmt; 55285612Sdelphij const char * x_fmt; 56285612Sdelphij const char * c_fmt; 57 const char * am; 58 const char * pm; 59 const char * date_fmt; 60}; 61 62static struct lc_time_T localebuf; 63static struct lc_time_T * _loc P((void)); 64static int using_locale; 65 66#define Locale (using_locale ? &localebuf : &C_time_locale) 67 68static 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 97 ** Note that 98 ** "%a %b %d %H:%M:%S %Y" 99 ** is used by Solaris 2.3. 100 */ 101 "%D %X", /* %m/%d/%y %H:%M:%S */ 102 103 /* am */ 104 "AM", 105 106 /* pm */ 107 "PM", 108 109 /* date_fmt */ 110 "%a %b %e %H:%M:%S %Z %Y" 111}; 112 113static char * _add P((const char *, char *, const char *)); 114static char * _conv P((int, const char *, char *, const char *)); 115static char * _fmt P((const char *, const struct tm *, char *, const char *)); 116 117size_t strftime P((char *, size_t, const char *, const struct tm *)); 118 119extern char * tzname[]; 120 121size_t 122strftime(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 138static 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 == '%') { 147label: 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 'T': 281 pt = _fmt("%H:%M:%S", t, pt, ptlim); 282 continue; 283 case 't': 284 pt = _add("\t", pt, ptlim); 285 continue; 286 case 'U': 287 pt = _conv((t->tm_yday + 7 - t->tm_wday) / 7, 288 "%02d", pt, ptlim); 289 continue; 290 case 'u': 291 /* 292 ** From Arnold Robbins' strftime version 3.0: 293 ** "ISO 8601: Weekday as a decimal number 294 ** [1 (Monday) - 7]" 295 ** (ado, 5/24/93) 296 */ 297 pt = _conv((t->tm_wday == 0) ? 7 : t->tm_wday, 298 "%d", pt, ptlim); 299 continue; 300 case 'V': 301 /* 302 ** From Arnold Robbins' strftime version 3.0: 303 ** "the week number of the year (the first 304 ** Monday as the first day of week 1) as a 305 ** decimal number (01-53). The method for 306 ** determining the week number is as specified 307 ** by ISO 8601 (to wit: if the week containing 308 ** January 1 has four or more days in the new 309 ** year, then it is week 1, otherwise it is 310 ** week 53 of the previous year and the next 311 ** week is week 1)." 312 ** (ado, 5/24/93) 313 */ 314 /* 315 ** XXX--If January 1 falls on a Friday, 316 ** January 1-3 are part of week 53 of the 317 ** previous year. By analogy, if January 318 ** 1 falls on a Thursday, are December 29-31 319 ** of the PREVIOUS year part of week 1??? 320 ** (ado 5/24/93) 321 */ 322 /* 323 ** You are understood not to expect this. 324 */ 325 { 326 int i; 327 328 i = (t->tm_yday + 10 - (t->tm_wday ? 329 (t->tm_wday - 1) : 6)) / 7; 330 if (i == 0) { 331 /* 332 ** What day of the week does 333 ** January 1 fall on? 334 */ 335 i = t->tm_wday - 336 (t->tm_yday - 1); 337 /* 338 ** Fri Jan 1: 53 339 ** Sun Jan 1: 52 340 ** Sat Jan 1: 53 if previous 341 ** year a leap 342 ** year, else 52 343 */ 344 if (i == TM_FRIDAY) 345 i = 53; 346 else if (i == TM_SUNDAY) 347 i = 52; 348 else i = isleap(t->tm_year + 349 TM_YEAR_BASE) ? 350 53 : 52; 351#ifdef XPG4_1994_04_09 352 /* 353 ** As of 4/9/94, though, 354 ** XPG4 calls for 53 355 ** unconditionally. 356 */ 357 i = 53; 358#endif /* defined XPG4_1994_04_09 */ 359 } 360 pt = _conv(i, "%02d", pt, ptlim); 361 } 362 continue; 363 case 'v': 364 /* 365 ** From Arnold Robbins' strftime version 3.0: 366 ** "date as dd-bbb-YYYY" 367 ** (ado, 5/24/93) 368 */ 369 pt = _fmt("%e-%b-%Y", t, pt, ptlim); 370 continue; 371 case 'W': 372 pt = _conv((t->tm_yday + 7 - 373 (t->tm_wday ? 374 (t->tm_wday - 1) : 6)) / 7, 375 "%02d", pt, ptlim); 376 continue; 377 case 'w': 378 pt = _conv(t->tm_wday, "%d", pt, ptlim); 379 continue; 380 case 'X': 381 pt = _fmt(Locale->X_fmt, t, pt, ptlim); 382 continue; 383 case 'x': 384 pt = _fmt(Locale->x_fmt, t, pt, ptlim); 385 continue; 386 case 'y': 387 pt = _conv((t->tm_year + TM_YEAR_BASE) % 100, 388 "%02d", pt, ptlim); 389 continue; 390 case 'Y': 391 pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d", 392 pt, ptlim); 393 continue; 394 case 'Z': 395 if (t->tm_zone != NULL) 396 pt = _add(t->tm_zone, pt, ptlim); 397 else 398 if (t->tm_isdst == 0 || t->tm_isdst == 1) { 399 pt = _add(tzname[t->tm_isdst], 400 pt, ptlim); 401 } else pt = _add("?", pt, ptlim); 402 continue; 403 case '+': 404 pt = _fmt(Locale->date_fmt, t, pt, ptlim); 405 continue; 406 case '%': 407 /* 408 * X311J/88-090 (4.12.3.5): if conversion char is 409 * undefined, behavior is undefined. Print out the 410 * character itself as printf(3) also does. 411 */ 412 default: 413 break; 414 } 415 } 416 if (pt == ptlim) 417 break; 418 *pt++ = *format; 419 } 420 return pt; 421} 422 423static char * 424_conv(n, format, pt, ptlim) 425 const int n; 426 const char *const format; 427 char *const pt; 428 const char *const ptlim; 429{ 430 char buf[INT_STRLEN_MAXIMUM(int) + 1]; 431 432 (void) sprintf(buf, format, n); 433 return _add(buf, pt, ptlim); 434} 435 436static char * 437_add(str, pt, ptlim) 438 const char *str; 439 char *pt; 440 const char *const ptlim; 441{ 442 while (pt < ptlim && (*pt = *str++) != '\0') 443 ++pt; 444 return pt; 445} 446 447extern char *_PathLocale; 448 449int 450__time_load_locale(const char *name) 451{ 452 static const char lc_time[] = "LC_TIME"; 453 static char * locale_buf; 454 static char locale_buf_C[] = "C"; 455 456 int fd; 457 char * lbuf; 458 char * p; 459 const char ** ap; 460 const char * plim; 461 char filename[FILENAME_MAX]; 462 struct stat st; 463 size_t namesize; 464 size_t bufsize; 465 466 using_locale = 0; 467 468 if (!strcmp(name, "C") || !strcmp(name, "POSIX")) 469 return 0; 470 471 if (name == NULL || *name == '\0') { 472 goto no_locale; 473 } 474 /* 475 ** If the locale name is the same as our cache, use the cache. 476 */ 477 lbuf = locale_buf; 478 if (lbuf != NULL && strcmp(name, lbuf) == 0) { 479 p = lbuf; 480 for (ap = (const char **) &localebuf; 481 ap < (const char **) (&localebuf + 1); 482 ++ap) 483 *ap = p += strlen(p) + 1; 484 using_locale = 1; 485 return 0; 486 } 487 /* 488 ** Slurp the locale file into the cache. 489 */ 490 namesize = strlen(name) + 1; 491 492 snprintf(filename, sizeof filename, 493 "%s/%s/%s", 494 _PathLocale, name, lc_time); 495 fd = open(filename, O_RDONLY); 496 if (fd < 0) { 497 goto no_locale; 498 } 499 if (fstat(fd, &st) != 0) 500 goto bad_locale; 501 if (st.st_size <= 0) 502 goto bad_locale; 503 bufsize = namesize + st.st_size; 504 locale_buf = NULL; 505 lbuf = (lbuf == NULL || lbuf == locale_buf_C) ? 506 malloc(bufsize) : realloc(lbuf, bufsize); 507 if (lbuf == NULL) 508 goto bad_locale; 509 (void) strcpy(lbuf, name); 510 p = lbuf + namesize; 511 plim = p + st.st_size; 512 if (read(fd, p, (size_t) st.st_size) != st.st_size) 513 goto bad_lbuf; 514 if (close(fd) != 0) 515 goto bad_lbuf; 516 /* 517 ** Parse the locale file into localebuf. 518 */ 519 if (plim[-1] != '\n') 520 goto bad_lbuf; 521 for (ap = (const char **) &localebuf; 522 ap < (const char **) (&localebuf + 1); 523 ++ap) { 524 if (p == plim) 525 goto bad_lbuf; 526 *ap = p; 527 while (*p != '\n') 528 ++p; 529 *p++ = '\0'; 530 } 531 /* 532 ** Record the successful parse in the cache. 533 */ 534 locale_buf = lbuf; 535 536 using_locale = 1; 537 return 0; 538 539bad_lbuf: 540 free(lbuf); 541bad_locale: 542 (void) close(fd); 543no_locale: 544 /* 545 * XXX - This may not be the correct thing to do in this case. 546 * setlocale() assumes that we left the old locale alone. 547 */ 548 locale_buf = locale_buf_C; 549 localebuf = C_time_locale; 550 return -1; 551} 552