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 "$FreeBSD$"; 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 "namespace.h" 34 #include "private.h" 35 36 #ifndef LIBC_SCCS 37 #ifndef lint 38 static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89"; 39 #endif /* !defined lint */ 40 #endif /* !defined LIBC_SCCS */ 41 42 #include "tzfile.h" 43 #include <fcntl.h> 44 #include <sys/stat.h> 45 #include "un-namespace.h" 46 #include "timelocal.h" 47 48 static char * _add P((const char *, char *, const char *)); 49 static char * _conv P((int, const char *, char *, const char *)); 50 static char * _fmt P((const char *, const struct tm *, char *, const char *)); 51 52 size_t strftime P((char *, size_t, const char *, const struct tm *)); 53 54 extern char * tzname[]; 55 56 size_t 57 strftime(s, maxsize, format, t) 58 char *const s; 59 const size_t maxsize; 60 const char *const format; 61 const struct tm *const t; 62 { 63 char *p; 64 65 tzset(); 66 p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize); 67 if (p == s + maxsize) 68 return 0; 69 *p = '\0'; 70 return p - s; 71 } 72 73 static char * 74 _fmt(format, t, pt, ptlim) 75 const char *format; 76 const struct tm *const t; 77 char *pt; 78 const char *const ptlim; 79 { 80 int Ealternative, Oalternative; 81 82 for ( ; *format; ++format) { 83 if (*format == '%') { 84 Ealternative = 0; 85 Oalternative = 0; 86 label: 87 switch (*++format) { 88 case '\0': 89 --format; 90 break; 91 case 'A': 92 pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? 93 "?" : Locale->weekday[t->tm_wday], 94 pt, ptlim); 95 continue; 96 case 'a': 97 pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? 98 "?" : Locale->wday[t->tm_wday], 99 pt, ptlim); 100 continue; 101 case 'B': 102 pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? 103 "?" : (Oalternative ? Locale->alt_month : 104 Locale->month)[t->tm_mon], 105 pt, ptlim); 106 continue; 107 case 'b': 108 case 'h': 109 pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? 110 "?" : Locale->mon[t->tm_mon], 111 pt, ptlim); 112 continue; 113 case 'C': 114 /* 115 ** %C used to do a... 116 ** _fmt("%a %b %e %X %Y", t); 117 ** ...whereas now POSIX 1003.2 calls for 118 ** something completely different. 119 ** (ado, 5/24/93) 120 */ 121 pt = _conv((t->tm_year + TM_YEAR_BASE) / 100, 122 "%02d", pt, ptlim); 123 continue; 124 case 'c': 125 /* NOTE: c_fmt is intentionally ignored */ 126 pt = _fmt("%a %Ef %T %Y", t, pt, ptlim); 127 continue; 128 case 'D': 129 pt = _fmt("%m/%d/%y", t, pt, ptlim); 130 continue; 131 case 'd': 132 pt = _conv(t->tm_mday, "%02d", pt, ptlim); 133 continue; 134 case 'E': 135 if (Ealternative || Oalternative) 136 break; 137 Ealternative++; 138 goto label; 139 case 'O': 140 /* 141 ** POSIX locale extensions, a la 142 ** Arnold Robbins' strftime version 3.0. 143 ** The sequences 144 ** %Ec %EC %Ex %EX %Ey %EY 145 ** %Od %oe %OH %OI %Om %OM 146 ** %OS %Ou %OU %OV %Ow %OW %Oy 147 ** are supposed to provide alternate 148 ** representations. 149 ** (ado, 5/24/93) 150 ** 151 ** FreeBSD extensions 152 ** %OB %Ef %EF 153 */ 154 if (Ealternative || Oalternative) 155 break; 156 Oalternative++; 157 goto label; 158 case 'e': 159 pt = _conv(t->tm_mday, "%2d", pt, ptlim); 160 continue; 161 case 'f': 162 if (!Ealternative) 163 break; 164 pt = _fmt(Locale->Ef_fmt, t, pt, ptlim); 165 continue; 166 case 'F': 167 if (!Ealternative) 168 break; 169 pt = _fmt(Locale->EF_fmt, t, pt, ptlim); 170 continue; 171 case 'H': 172 pt = _conv(t->tm_hour, "%02d", pt, ptlim); 173 continue; 174 case 'I': 175 pt = _conv((t->tm_hour % 12) ? 176 (t->tm_hour % 12) : 12, 177 "%02d", pt, ptlim); 178 continue; 179 case 'j': 180 pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim); 181 continue; 182 case 'k': 183 /* 184 ** This used to be... 185 ** _conv(t->tm_hour % 12 ? 186 ** t->tm_hour % 12 : 12, 2, ' '); 187 ** ...and has been changed to the below to 188 ** match SunOS 4.1.1 and Arnold Robbins' 189 ** strftime version 3.0. That is, "%k" and 190 ** "%l" have been swapped. 191 ** (ado, 5/24/93) 192 */ 193 pt = _conv(t->tm_hour, "%2d", pt, ptlim); 194 continue; 195 #ifdef KITCHEN_SINK 196 case 'K': 197 /* 198 ** After all this time, still unclaimed! 199 */ 200 pt = _add("kitchen sink", pt, ptlim); 201 continue; 202 #endif /* defined KITCHEN_SINK */ 203 case 'l': 204 /* 205 ** This used to be... 206 ** _conv(t->tm_hour, 2, ' '); 207 ** ...and has been changed to the below to 208 ** match SunOS 4.1.1 and Arnold Robbin's 209 ** strftime version 3.0. That is, "%k" and 210 ** "%l" have been swapped. 211 ** (ado, 5/24/93) 212 */ 213 pt = _conv((t->tm_hour % 12) ? 214 (t->tm_hour % 12) : 12, 215 "%2d", pt, ptlim); 216 continue; 217 case 'M': 218 pt = _conv(t->tm_min, "%02d", pt, ptlim); 219 continue; 220 case 'm': 221 pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim); 222 continue; 223 case 'n': 224 pt = _add("\n", pt, ptlim); 225 continue; 226 case 'p': 227 pt = _add((t->tm_hour >= 12) ? 228 Locale->pm : 229 Locale->am, 230 pt, ptlim); 231 continue; 232 case 'R': 233 pt = _fmt("%H:%M", t, pt, ptlim); 234 continue; 235 case 'r': 236 pt = _fmt("%I:%M:%S %p", t, pt, ptlim); 237 continue; 238 case 'S': 239 pt = _conv(t->tm_sec, "%02d", pt, ptlim); 240 continue; 241 case 's': 242 { 243 struct tm tm; 244 char buf[INT_STRLEN_MAXIMUM( 245 time_t) + 1]; 246 time_t mkt; 247 248 tm = *t; 249 mkt = mktime(&tm); 250 if (TYPE_SIGNED(time_t)) 251 (void) sprintf(buf, "%ld", 252 (long) mkt); 253 else (void) sprintf(buf, "%lu", 254 (unsigned long) mkt); 255 pt = _add(buf, pt, ptlim); 256 } 257 continue; 258 case 'T': 259 pt = _fmt("%H:%M:%S", t, pt, ptlim); 260 continue; 261 case 't': 262 pt = _add("\t", pt, ptlim); 263 continue; 264 case 'U': 265 pt = _conv((t->tm_yday + 7 - t->tm_wday) / 7, 266 "%02d", pt, ptlim); 267 continue; 268 case 'u': 269 /* 270 ** From Arnold Robbins' strftime version 3.0: 271 ** "ISO 8601: Weekday as a decimal number 272 ** [1 (Monday) - 7]" 273 ** (ado, 5/24/93) 274 */ 275 pt = _conv((t->tm_wday == 0) ? 7 : t->tm_wday, 276 "%d", pt, ptlim); 277 continue; 278 case 'V': /* ISO 8601 week number */ 279 case 'G': /* ISO 8601 year (four digits) */ 280 case 'g': /* ISO 8601 year (two digits) */ 281 /* 282 ** From Arnold Robbins' strftime version 3.0: "the week number of the 283 ** year (the first Monday as the first day of week 1) as a decimal number 284 ** (01-53)." 285 ** (ado, 1993-05-24) 286 ** 287 ** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn: 288 ** "Week 01 of a year is per definition the first week which has the 289 ** Thursday in this year, which is equivalent to the week which contains 290 ** the fourth day of January. In other words, the first week of a new year 291 ** is the week which has the majority of its days in the new year. Week 01 292 ** might also contain days from the previous year and the week before week 293 ** 01 of a year is the last week (52 or 53) of the previous year even if 294 ** it contains days from the new year. A week starts with Monday (day 1) 295 ** and ends with Sunday (day 7). For example, the first week of the year 296 ** 1997 lasts from 1996-12-30 to 1997-01-05..." 297 ** (ado, 1996-01-02) 298 */ 299 { 300 int year; 301 int yday; 302 int wday; 303 int w; 304 305 year = t->tm_year + TM_YEAR_BASE; 306 yday = t->tm_yday; 307 wday = t->tm_wday; 308 for ( ; ; ) { 309 int len; 310 int bot; 311 int top; 312 313 len = isleap(year) ? 314 DAYSPERLYEAR : 315 DAYSPERNYEAR; 316 /* 317 ** What yday (-3 ... 3) does 318 ** the ISO year begin on? 319 */ 320 bot = ((yday + 11 - wday) % 321 DAYSPERWEEK) - 3; 322 /* 323 ** What yday does the NEXT 324 ** ISO year begin on? 325 */ 326 top = bot - 327 (len % DAYSPERWEEK); 328 if (top < -3) 329 top += DAYSPERWEEK; 330 top += len; 331 if (yday >= top) { 332 ++year; 333 w = 1; 334 break; 335 } 336 if (yday >= bot) { 337 w = 1 + ((yday - bot) / 338 DAYSPERWEEK); 339 break; 340 } 341 --year; 342 yday += isleap(year) ? 343 DAYSPERLYEAR : 344 DAYSPERNYEAR; 345 } 346 #ifdef XPG4_1994_04_09 347 if ((w == 52 348 && t->tm_mon == TM_JANUARY) 349 || (w == 1 350 && t->tm_mon == TM_DECEMBER)) 351 w = 53; 352 #endif /* defined XPG4_1994_04_09 */ 353 if (*format == 'V') 354 pt = _conv(w, "%02d", 355 pt, ptlim); 356 else if (*format == 'g') { 357 pt = _conv(year % 100, "%02d", 358 pt, ptlim); 359 } else pt = _conv(year, "%04d", 360 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 'z': 404 { 405 long absoff; 406 if (t->tm_gmtoff >= 0) { 407 absoff = t->tm_gmtoff; 408 pt = _add("+", pt, ptlim); 409 } else { 410 absoff = -t->tm_gmtoff; 411 pt = _add("-", pt, ptlim); 412 } 413 pt = _conv(absoff / 3600, "%02d", 414 pt, ptlim); 415 pt = _conv((absoff % 3600) / 60, "%02d", 416 pt, ptlim); 417 }; 418 continue; 419 case '+': 420 pt = _fmt(Locale->date_fmt, t, pt, ptlim); 421 continue; 422 case '%': 423 /* 424 * X311J/88-090 (4.12.3.5): if conversion char is 425 * undefined, behavior is undefined. Print out the 426 * character itself as printf(3) also does. 427 */ 428 default: 429 break; 430 } 431 } 432 if (pt == ptlim) 433 break; 434 *pt++ = *format; 435 } 436 return pt; 437 } 438 439 static char * 440 _conv(n, format, pt, ptlim) 441 const int n; 442 const char *const format; 443 char *const pt; 444 const char *const ptlim; 445 { 446 char buf[INT_STRLEN_MAXIMUM(int) + 1]; 447 448 (void) snprintf(buf, sizeof(buf), format, n); 449 return _add(buf, pt, ptlim); 450 } 451 452 static char * 453 _add(str, pt, ptlim) 454 const char *str; 455 char *pt; 456 const char *const ptlim; 457 { 458 while (pt < ptlim && (*pt = *str++) != '\0') 459 ++pt; 460 return pt; 461 } 462