1/* 2 * Modified slightly by Chet Ramey for inclusion in Bash 3 */ 4 5/* 6 * strftime.c 7 * 8 * Public-domain implementation of ISO C library routine. 9 * 10 * If you can't do prototypes, get GCC. 11 * 12 * The C99 standard now specifies just about all of the formats 13 * that were additional in the earlier versions of this file. 14 * 15 * For extensions from SunOS, add SUNOS_EXT. 16 * For extensions from HP/UX, add HPUX_EXT. 17 * For VMS dates, add VMS_EXT. 18 * For complete POSIX semantics, add POSIX_SEMANTICS. 19 * 20 * The code for %c, %x, and %X follows the C99 specification for 21 * the "C" locale. 22 * 23 * This version ignores LOCALE information. 24 * It also doesn't worry about multi-byte characters. 25 * So there. 26 * 27 * This file is also shipped with GAWK (GNU Awk), gawk specific bits of 28 * code are included if GAWK is defined. 29 * 30 * Arnold Robbins 31 * January, February, March, 1991 32 * Updated March, April 1992 33 * Updated April, 1993 34 * Updated February, 1994 35 * Updated May, 1994 36 * Updated January, 1995 37 * Updated September, 1995 38 * Updated January, 1996 39 * Updated July, 1997 40 * Updated October, 1999 41 * Updated September, 2000 42 * 43 * Fixes from ado@elsie.nci.nih.gov, 44 * February 1991, May 1992 45 * Fixes from Tor Lillqvist tml@tik.vtt.fi, 46 * May 1993 47 * Further fixes from ado@elsie.nci.nih.gov, 48 * February 1994 49 * %z code from chip@chinacat.unicom.com, 50 * Applied September 1995 51 * %V code fixed (again) and %G, %g added, 52 * January 1996 53 * %v code fixed, better configuration, 54 * July 1997 55 * Moved to C99 specification. 56 * September 2000 57 */ 58#include <config.h> 59 60#ifndef GAWK 61#include <stdio.h> 62#include <ctype.h> 63#include <time.h> 64#endif 65#if defined(TM_IN_SYS_TIME) 66#include <sys/types.h> 67#include <sys/time.h> 68#endif 69 70#include <stdlib.h> 71#include <string.h> 72 73/* defaults: season to taste */ 74#define SUNOS_EXT 1 /* stuff in SunOS strftime routine */ 75#define VMS_EXT 1 /* include %v for VMS date format */ 76#define HPUX_EXT 1 /* non-conflicting stuff in HP-UX date */ 77#ifndef GAWK 78#define POSIX_SEMANTICS 1 /* call tzset() if TZ changes */ 79#endif 80 81#undef strchr /* avoid AIX weirdness */ 82 83#if defined (SHELL) 84extern char *get_string_value (const char *); 85#endif 86 87extern void tzset(void); 88static int weeknumber(const struct tm *timeptr, int firstweekday); 89static int iso8601wknum(const struct tm *timeptr); 90 91#ifndef inline 92#ifdef __GNUC__ 93#define inline __inline__ 94#else 95#define inline /**/ 96#endif 97#endif 98 99#define range(low, item, hi) max(low, min(item, hi)) 100 101#if !defined(OS2) && !defined(MSDOS) && defined(HAVE_TZNAME) 102extern char *tzname[2]; 103extern int daylight; 104#if defined(SOLARIS) || defined(mips) || defined (M_UNIX) 105extern long int timezone, altzone; 106#else 107# if defined (HPUX) 108extern long int timezone; 109# else 110extern int timezone, altzone; 111# endif /* !HPUX */ 112#endif /* !SOLARIS && !mips && !M_UNIX */ 113#endif 114 115#undef min /* just in case */ 116 117/* min --- return minimum of two numbers */ 118 119static inline int 120min(int a, int b) 121{ 122 return (a < b ? a : b); 123} 124 125#undef max /* also, just in case */ 126 127/* max --- return maximum of two numbers */ 128 129static inline int 130max(int a, int b) 131{ 132 return (a > b ? a : b); 133} 134 135/* strftime --- produce formatted time */ 136 137size_t 138strftime(char *s, size_t maxsize, const char *format, const struct tm *timeptr) 139{ 140 char *endp = s + maxsize; 141 char *start = s; 142 auto char tbuf[100]; 143 long off; 144 int i, w, y; 145 static short first = 1; 146#ifdef POSIX_SEMANTICS 147 static char *savetz = NULL; 148 static int savetzlen = 0; 149 char *tz; 150#endif /* POSIX_SEMANTICS */ 151#ifndef HAVE_TM_ZONE 152#ifndef HAVE_TM_NAME 153#ifndef HAVE_TZNAME 154 extern char *timezone(); 155 struct timeval tv; 156 struct timezone zone; 157#endif /* HAVE_TZNAME */ 158#endif /* HAVE_TM_NAME */ 159#endif /* HAVE_TM_ZONE */ 160 161 /* various tables, useful in North America */ 162 static const char *days_a[] = { 163 "Sun", "Mon", "Tue", "Wed", 164 "Thu", "Fri", "Sat", 165 }; 166 static const char *days_l[] = { 167 "Sunday", "Monday", "Tuesday", "Wednesday", 168 "Thursday", "Friday", "Saturday", 169 }; 170 static const char *months_a[] = { 171 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 172 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", 173 }; 174 static const char *months_l[] = { 175 "January", "February", "March", "April", 176 "May", "June", "July", "August", "September", 177 "October", "November", "December", 178 }; 179 static const char *ampm[] = { "AM", "PM", }; 180 181 if (s == NULL || format == NULL || timeptr == NULL || maxsize == 0) 182 return 0; 183 184 /* quick check if we even need to bother */ 185 if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize) 186 return 0; 187 188#ifndef POSIX_SEMANTICS 189 if (first) { 190 tzset(); 191 first = 0; 192 } 193#else /* POSIX_SEMANTICS */ 194#if defined (SHELL) 195 tz = get_string_value ("TZ"); 196#else 197 tz = getenv("TZ"); 198#endif 199 if (first) { 200 if (tz != NULL) { 201 int tzlen = strlen(tz); 202 203 savetz = (char *) malloc(tzlen + 1); 204 if (savetz != NULL) { 205 savetzlen = tzlen + 1; 206 strcpy(savetz, tz); 207 } 208 } 209 tzset(); 210 first = 0; 211 } 212 /* if we have a saved TZ, and it is different, recapture and reset */ 213 if (tz && savetz && (tz[0] != savetz[0] || strcmp(tz, savetz) != 0)) { 214 i = strlen(tz) + 1; 215 if (i > savetzlen) { 216 savetz = (char *) realloc(savetz, i); 217 if (savetz) { 218 savetzlen = i; 219 strcpy(savetz, tz); 220 } 221 } else 222 strcpy(savetz, tz); 223 tzset(); 224 } 225#endif /* POSIX_SEMANTICS */ 226 227 for (; *format && s < endp - 1; format++) { 228 tbuf[0] = '\0'; 229 if (*format != '%') { 230 *s++ = *format; 231 continue; 232 } 233 again: 234 switch (*++format) { 235 case '\0': 236 *s++ = '%'; 237 goto out; 238 239 case '%': 240 *s++ = '%'; 241 continue; 242 243 case 'a': /* abbreviated weekday name */ 244 if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6) 245 strcpy(tbuf, "?"); 246 else 247 strcpy(tbuf, days_a[timeptr->tm_wday]); 248 break; 249 250 case 'A': /* full weekday name */ 251 if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6) 252 strcpy(tbuf, "?"); 253 else 254 strcpy(tbuf, days_l[timeptr->tm_wday]); 255 break; 256 257 case 'b': /* abbreviated month name */ 258 short_month: 259 if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11) 260 strcpy(tbuf, "?"); 261 else 262 strcpy(tbuf, months_a[timeptr->tm_mon]); 263 break; 264 265 case 'B': /* full month name */ 266 if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11) 267 strcpy(tbuf, "?"); 268 else 269 strcpy(tbuf, months_l[timeptr->tm_mon]); 270 break; 271 272 case 'c': /* appropriate date and time representation */ 273 /* 274 * This used to be: 275 * 276 * strftime(tbuf, sizeof tbuf, "%a %b %e %H:%M:%S %Y", timeptr); 277 * 278 * Now, per the ISO 1999 C standard, it this: 279 */ 280 strftime(tbuf, sizeof tbuf, "%A %B %d %T %Y", timeptr); 281 break; 282 283 case 'C': 284 century: 285 sprintf(tbuf, "%02d", (timeptr->tm_year + 1900) / 100); 286 break; 287 288 case 'd': /* day of the month, 01 - 31 */ 289 i = range(1, timeptr->tm_mday, 31); 290 sprintf(tbuf, "%02d", i); 291 break; 292 293 case 'D': /* date as %m/%d/%y */ 294 strftime(tbuf, sizeof tbuf, "%m/%d/%y", timeptr); 295 break; 296 297 case 'e': /* day of month, blank padded */ 298 sprintf(tbuf, "%2d", range(1, timeptr->tm_mday, 31)); 299 break; 300 301 case 'E': 302 /* POSIX (now C99) locale extensions, ignored for now */ 303 goto again; 304 305 case 'F': /* ISO 8601 date representation */ 306 strftime(tbuf, sizeof tbuf, "%Y-%m-%d", timeptr); 307 break; 308 309 case 'g': 310 case 'G': 311 /* 312 * Year of ISO week. 313 * 314 * If it's December but the ISO week number is one, 315 * that week is in next year. 316 * If it's January but the ISO week number is 52 or 317 * 53, that week is in last year. 318 * Otherwise, it's this year. 319 */ 320 w = iso8601wknum(timeptr); 321 if (timeptr->tm_mon == 11 && w == 1) 322 y = 1900 + timeptr->tm_year + 1; 323 else if (timeptr->tm_mon == 0 && w >= 52) 324 y = 1900 + timeptr->tm_year - 1; 325 else 326 y = 1900 + timeptr->tm_year; 327 328 if (*format == 'G') 329 sprintf(tbuf, "%d", y); 330 else 331 sprintf(tbuf, "%02d", y % 100); 332 break; 333 334 case 'h': /* abbreviated month name */ 335 goto short_month; 336 337 case 'H': /* hour, 24-hour clock, 00 - 23 */ 338 i = range(0, timeptr->tm_hour, 23); 339 sprintf(tbuf, "%02d", i); 340 break; 341 342 case 'I': /* hour, 12-hour clock, 01 - 12 */ 343 i = range(0, timeptr->tm_hour, 23); 344 if (i == 0) 345 i = 12; 346 else if (i > 12) 347 i -= 12; 348 sprintf(tbuf, "%02d", i); 349 break; 350 351 case 'j': /* day of the year, 001 - 366 */ 352 sprintf(tbuf, "%03d", timeptr->tm_yday + 1); 353 break; 354 355 case 'm': /* month, 01 - 12 */ 356 i = range(0, timeptr->tm_mon, 11); 357 sprintf(tbuf, "%02d", i + 1); 358 break; 359 360 case 'M': /* minute, 00 - 59 */ 361 i = range(0, timeptr->tm_min, 59); 362 sprintf(tbuf, "%02d", i); 363 break; 364 365 case 'n': /* same as \n */ 366 tbuf[0] = '\n'; 367 tbuf[1] = '\0'; 368 break; 369 370 case 'O': 371 /* POSIX (now C99) locale extensions, ignored for now */ 372 goto again; 373 374 case 'p': /* am or pm based on 12-hour clock */ 375 i = range(0, timeptr->tm_hour, 23); 376 if (i < 12) 377 strcpy(tbuf, ampm[0]); 378 else 379 strcpy(tbuf, ampm[1]); 380 break; 381 382 case 'r': /* time as %I:%M:%S %p */ 383 strftime(tbuf, sizeof tbuf, "%I:%M:%S %p", timeptr); 384 break; 385 386 case 'R': /* time as %H:%M */ 387 strftime(tbuf, sizeof tbuf, "%H:%M", timeptr); 388 break; 389 390#if defined(HAVE_MKTIME) || defined(GAWK) 391 case 's': /* time as seconds since the Epoch */ 392 { 393 struct tm non_const_timeptr; 394 395 non_const_timeptr = *timeptr; 396 sprintf(tbuf, "%ld", mktime(& non_const_timeptr)); 397 break; 398 } 399#endif /* defined(HAVE_MKTIME) || defined(GAWK) */ 400 401 case 'S': /* second, 00 - 60 */ 402 i = range(0, timeptr->tm_sec, 60); 403 sprintf(tbuf, "%02d", i); 404 break; 405 406 case 't': /* same as \t */ 407 tbuf[0] = '\t'; 408 tbuf[1] = '\0'; 409 break; 410 411 case 'T': /* time as %H:%M:%S */ 412 the_time: 413 strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr); 414 break; 415 416 case 'u': 417 /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */ 418 sprintf(tbuf, "%d", timeptr->tm_wday == 0 ? 7 : 419 timeptr->tm_wday); 420 break; 421 422 case 'U': /* week of year, Sunday is first day of week */ 423 sprintf(tbuf, "%02d", weeknumber(timeptr, 0)); 424 break; 425 426 case 'V': /* week of year according ISO 8601 */ 427 sprintf(tbuf, "%02d", iso8601wknum(timeptr)); 428 break; 429 430 case 'w': /* weekday, Sunday == 0, 0 - 6 */ 431 i = range(0, timeptr->tm_wday, 6); 432 sprintf(tbuf, "%d", i); 433 break; 434 435 case 'W': /* week of year, Monday is first day of week */ 436 sprintf(tbuf, "%02d", weeknumber(timeptr, 1)); 437 break; 438 439 case 'x': /* appropriate date representation */ 440 strftime(tbuf, sizeof tbuf, "%A %B %d %Y", timeptr); 441 break; 442 443 case 'X': /* appropriate time representation */ 444 goto the_time; 445 break; 446 447 case 'y': /* year without a century, 00 - 99 */ 448 year: 449 i = timeptr->tm_year % 100; 450 sprintf(tbuf, "%02d", i); 451 break; 452 453 case 'Y': /* year with century */ 454 fullyear: 455 sprintf(tbuf, "%d", 1900 + timeptr->tm_year); 456 break; 457 458 /* 459 * From: Chip Rosenthal <chip@chinacat.unicom.com> 460 * Date: Sun, 19 Mar 1995 00:33:29 -0600 (CST) 461 * 462 * Warning: the %z [code] is implemented by inspecting the 463 * timezone name conditional compile settings, and 464 * inferring a method to get timezone offsets. I've tried 465 * this code on a couple of machines, but I don't doubt 466 * there is some system out there that won't like it. 467 * Maybe the easiest thing to do would be to bracket this 468 * with an #ifdef that can turn it off. The %z feature 469 * would be an admittedly obscure one that most folks can 470 * live without, but it would be a great help to those of 471 * us that muck around with various message processors. 472 */ 473 case 'z': /* time zone offset east of GMT e.g. -0600 */ 474#ifdef HAVE_TM_NAME 475 /* 476 * Systems with tm_name probably have tm_tzadj as 477 * secs west of GMT. Convert to mins east of GMT. 478 */ 479 off = -timeptr->tm_tzadj / 60; 480#else /* !HAVE_TM_NAME */ 481#ifdef HAVE_TM_ZONE 482 /* 483 * Systems with tm_zone probably have tm_gmtoff as 484 * secs east of GMT. Convert to mins east of GMT. 485 */ 486 off = timeptr->tm_gmtoff / 60; 487#else /* !HAVE_TM_ZONE */ 488#if HAVE_TZNAME 489 /* 490 * Systems with tzname[] probably have timezone as 491 * secs west of GMT. Convert to mins east of GMT. 492 */ 493# ifdef HPUX 494 off = -timezone / 60; 495# else 496 off = -(daylight ? timezone : altzone) / 60; 497# endif /* !HPUX */ 498#else /* !HAVE_TZNAME */ 499 gettimeofday(& tv, & zone); 500 off = -zone.tz_minuteswest; 501#endif /* !HAVE_TZNAME */ 502#endif /* !HAVE_TM_ZONE */ 503#endif /* !HAVE_TM_NAME */ 504 if (off < 0) { 505 tbuf[0] = '-'; 506 off = -off; 507 } else { 508 tbuf[0] = '+'; 509 } 510 sprintf(tbuf+1, "%02d%02d", off/60, off%60); 511 break; 512 513 case 'Z': /* time zone name or abbrevation */ 514#ifdef HAVE_TZNAME 515 i = (daylight && timeptr->tm_isdst > 0); /* 0 or 1 */ 516 strcpy(tbuf, tzname[i]); 517#else 518#ifdef HAVE_TM_ZONE 519 strcpy(tbuf, timeptr->tm_zone); 520#else 521#ifdef HAVE_TM_NAME 522 strcpy(tbuf, timeptr->tm_name); 523#else 524 gettimeofday(& tv, & zone); 525 strcpy(tbuf, timezone(zone.tz_minuteswest, 526 timeptr->tm_isdst > 0)); 527#endif /* HAVE_TM_NAME */ 528#endif /* HAVE_TM_ZONE */ 529#endif /* HAVE_TZNAME */ 530 break; 531 532#ifdef SUNOS_EXT 533 case 'k': /* hour, 24-hour clock, blank pad */ 534 sprintf(tbuf, "%2d", range(0, timeptr->tm_hour, 23)); 535 break; 536 537 case 'l': /* hour, 12-hour clock, 1 - 12, blank pad */ 538 i = range(0, timeptr->tm_hour, 23); 539 if (i == 0) 540 i = 12; 541 else if (i > 12) 542 i -= 12; 543 sprintf(tbuf, "%2d", i); 544 break; 545#endif 546 547#ifdef HPUX_EXT 548 case 'N': /* Emperor/Era name */ 549 /* this is essentially the same as the century */ 550 goto century; /* %C */ 551 552 case 'o': /* Emperor/Era year */ 553 goto year; /* %y */ 554#endif /* HPUX_EXT */ 555 556 557#ifdef VMS_EXT 558 case 'v': /* date as dd-bbb-YYYY */ 559 sprintf(tbuf, "%2d-%3.3s-%4d", 560 range(1, timeptr->tm_mday, 31), 561 months_a[range(0, timeptr->tm_mon, 11)], 562 timeptr->tm_year + 1900); 563 for (i = 3; i < 6; i++) 564 if (islower(tbuf[i])) 565 tbuf[i] = toupper(tbuf[i]); 566 break; 567#endif 568 569 default: 570 tbuf[0] = '%'; 571 tbuf[1] = *format; 572 tbuf[2] = '\0'; 573 break; 574 } 575 i = strlen(tbuf); 576 if (i) { 577 if (s + i < endp - 1) { 578 strcpy(s, tbuf); 579 s += i; 580 } else 581 return 0; 582 } 583 } 584out: 585 if (s < endp && *format == '\0') { 586 *s = '\0'; 587 return (s - start); 588 } else 589 return 0; 590} 591 592/* isleap --- is a year a leap year? */ 593 594static int 595isleap(int year) 596{ 597 return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0); 598} 599 600 601/* iso8601wknum --- compute week number according to ISO 8601 */ 602 603static int 604iso8601wknum(const struct tm *timeptr) 605{ 606 /* 607 * From 1003.2: 608 * If the week (Monday to Sunday) containing January 1 609 * has four or more days in the new year, then it is week 1; 610 * otherwise it is the highest numbered week of the previous 611 * year (52 or 53), and the next week is week 1. 612 * 613 * ADR: This means if Jan 1 was Monday through Thursday, 614 * it was week 1, otherwise week 52 or 53. 615 * 616 * XPG4 erroneously included POSIX.2 rationale text in the 617 * main body of the standard. Thus it requires week 53. 618 */ 619 620 int weeknum, jan1day, diff; 621 622 /* get week number, Monday as first day of the week */ 623 weeknum = weeknumber(timeptr, 1); 624 625 /* 626 * With thanks and tip of the hatlo to tml@tik.vtt.fi 627 * 628 * What day of the week does January 1 fall on? 629 * We know that 630 * (timeptr->tm_yday - jan1.tm_yday) MOD 7 == 631 * (timeptr->tm_wday - jan1.tm_wday) MOD 7 632 * and that 633 * jan1.tm_yday == 0 634 * and that 635 * timeptr->tm_wday MOD 7 == timeptr->tm_wday 636 * from which it follows that. . . 637 */ 638 jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7); 639 if (jan1day < 0) 640 jan1day += 7; 641 642 /* 643 * If Jan 1 was a Monday through Thursday, it was in 644 * week 1. Otherwise it was last year's highest week, which is 645 * this year's week 0. 646 * 647 * What does that mean? 648 * If Jan 1 was Monday, the week number is exactly right, it can 649 * never be 0. 650 * If it was Tuesday through Thursday, the weeknumber is one 651 * less than it should be, so we add one. 652 * Otherwise, Friday, Saturday or Sunday, the week number is 653 * OK, but if it is 0, it needs to be 52 or 53. 654 */ 655 switch (jan1day) { 656 case 1: /* Monday */ 657 break; 658 case 2: /* Tuesday */ 659 case 3: /* Wednesday */ 660 case 4: /* Thursday */ 661 weeknum++; 662 break; 663 case 5: /* Friday */ 664 case 6: /* Saturday */ 665 case 0: /* Sunday */ 666 if (weeknum == 0) { 667#ifdef USE_BROKEN_XPG4 668 /* XPG4 (as of March 1994) says 53 unconditionally */ 669 weeknum = 53; 670#else 671 /* get week number of last week of last year */ 672 struct tm dec31ly; /* 12/31 last year */ 673 dec31ly = *timeptr; 674 dec31ly.tm_year--; 675 dec31ly.tm_mon = 11; 676 dec31ly.tm_mday = 31; 677 dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1; 678 dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900); 679 weeknum = iso8601wknum(& dec31ly); 680#endif 681 } 682 break; 683 } 684 685 if (timeptr->tm_mon == 11) { 686 /* 687 * The last week of the year 688 * can be in week 1 of next year. 689 * Sigh. 690 * 691 * This can only happen if 692 * M T W 693 * 29 30 31 694 * 30 31 695 * 31 696 */ 697 int wday, mday; 698 699 wday = timeptr->tm_wday; 700 mday = timeptr->tm_mday; 701 if ( (wday == 1 && (mday >= 29 && mday <= 31)) 702 || (wday == 2 && (mday == 30 || mday == 31)) 703 || (wday == 3 && mday == 31)) 704 weeknum = 1; 705 } 706 707 return weeknum; 708} 709 710/* weeknumber --- figure how many weeks into the year */ 711 712/* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */ 713 714static int 715weeknumber(const struct tm *timeptr, int firstweekday) 716{ 717 int wday = timeptr->tm_wday; 718 int ret; 719 720 if (firstweekday == 1) { 721 if (wday == 0) /* sunday */ 722 wday = 6; 723 else 724 wday--; 725 } 726 ret = ((timeptr->tm_yday + 7 - wday) / 7); 727 if (ret < 0) 728 ret = 0; 729 return ret; 730} 731 732#if 0 733/* ADR --- I'm loathe to mess with ado's code ... */ 734 735Date: Wed, 24 Apr 91 20:54:08 MDT 736From: Michal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK> 737To: arnold@audiofax.com 738 739Hi Arnold, 740in a process of fixing of strftime() in libraries on Atari ST I grabbed 741some pieces of code from your own strftime. When doing that it came 742to mind that your weeknumber() function compiles a little bit nicer 743in the following form: 744/* 745 * firstweekday is 0 if starting in Sunday, non-zero if in Monday 746 */ 747{ 748 return (timeptr->tm_yday - timeptr->tm_wday + 749 (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7; 750} 751How nicer it depends on a compiler, of course, but always a tiny bit. 752 753 Cheers, 754 Michal 755 ntomczak@vm.ucs.ualberta.ca 756#endif 757 758#ifdef TEST_STRFTIME 759 760/* 761 * NAME: 762 * tst 763 * 764 * SYNOPSIS: 765 * tst 766 * 767 * DESCRIPTION: 768 * "tst" is a test driver for the function "strftime". 769 * 770 * OPTIONS: 771 * None. 772 * 773 * AUTHOR: 774 * Karl Vogel 775 * Control Data Systems, Inc. 776 * vogelke@c-17igp.wpafb.af.mil 777 * 778 * BUGS: 779 * None noticed yet. 780 * 781 * COMPILE: 782 * cc -o tst -DTEST_STRFTIME strftime.c 783 */ 784 785/* ADR: I reformatted this to my liking, and deleted some unneeded code. */ 786 787#ifndef NULL 788#include <stdio.h> 789#endif 790#include <sys/time.h> 791#include <string.h> 792 793#define MAXTIME 132 794 795/* 796 * Array of time formats. 797 */ 798 799static char *array[] = 800{ 801 "(%%A) full weekday name, var length (Sunday..Saturday) %A", 802 "(%%B) full month name, var length (January..December) %B", 803 "(%%C) Century %C", 804 "(%%D) date (%%m/%%d/%%y) %D", 805 "(%%E) Locale extensions (ignored) %E", 806 "(%%F) full month name, var length (January..December) %F", 807 "(%%H) hour (24-hour clock, 00..23) %H", 808 "(%%I) hour (12-hour clock, 01..12) %I", 809 "(%%M) minute (00..59) %M", 810 "(%%N) Emporer/Era Name %N", 811 "(%%O) Locale extensions (ignored) %O", 812 "(%%R) time, 24-hour (%%H:%%M) %R", 813 "(%%S) second (00..60) %S", 814 "(%%T) time, 24-hour (%%H:%%M:%%S) %T", 815 "(%%U) week of year, Sunday as first day of week (00..53) %U", 816 "(%%V) week of year according to ISO 8601 %V", 817 "(%%W) week of year, Monday as first day of week (00..53) %W", 818 "(%%X) appropriate locale time representation (%H:%M:%S) %X", 819 "(%%Y) year with century (1970...) %Y", 820 "(%%Z) timezone (EDT), or blank if timezone not determinable %Z", 821 "(%%a) locale's abbreviated weekday name (Sun..Sat) %a", 822 "(%%b) locale's abbreviated month name (Jan..Dec) %b", 823 "(%%c) full date (Sat Nov 4 12:02:33 1989)%n%t%t%t %c", 824 "(%%d) day of the month (01..31) %d", 825 "(%%e) day of the month, blank-padded ( 1..31) %e", 826 "(%%h) should be same as (%%b) %h", 827 "(%%j) day of the year (001..366) %j", 828 "(%%k) hour, 24-hour clock, blank pad ( 0..23) %k", 829 "(%%l) hour, 12-hour clock, blank pad ( 0..12) %l", 830 "(%%m) month (01..12) %m", 831 "(%%o) Emporer/Era Year %o", 832 "(%%p) locale's AM or PM based on 12-hour clock %p", 833 "(%%r) time, 12-hour (same as %%I:%%M:%%S %%p) %r", 834 "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7] %u", 835 "(%%v) VMS date (dd-bbb-YYYY) %v", 836 "(%%w) day of week (0..6, Sunday == 0) %w", 837 "(%%x) appropriate locale date representation %x", 838 "(%%y) last two digits of year (00..99) %y", 839 "(%%z) timezone offset east of GMT as HHMM (e.g. -0500) %z", 840 (char *) NULL 841}; 842 843/* main routine. */ 844 845int 846main(argc, argv) 847int argc; 848char **argv; 849{ 850 long time(); 851 852 char *next; 853 char string[MAXTIME]; 854 855 int k; 856 int length; 857 858 struct tm *tm; 859 860 long clock; 861 862 /* Call the function. */ 863 864 clock = time((long *) 0); 865 tm = localtime(&clock); 866 867 for (k = 0; next = array[k]; k++) { 868 length = strftime(string, MAXTIME, next, tm); 869 printf("%s\n", string); 870 } 871 872 exit(0); 873} 874#endif /* TEST_STRFTIME */ 875