1 /*- 2 * Copyright (c) 1997 Wolfgang Helbig 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #ifndef lint 28 static const char rcsid[] = 29 "$FreeBSD$"; 30 #endif /* not lint */ 31 32 #include <calendar.h> 33 #include <err.h> 34 #include <locale.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <sysexits.h> 39 #include <time.h> 40 #include <unistd.h> 41 42 /* Width of one month with backward compatibility */ 43 #define MONTH_WIDTH_B_J 27 44 #define MONTH_WIDTH_B 20 45 46 #define MONTH_WIDTH_J 24 47 #define MONTH_WIDTH 18 48 49 #define MAX_WIDTH 28 50 51 typedef struct date date; 52 53 struct monthlines { 54 char name[MAX_WIDTH + 1]; 55 char lines[7][MAX_WIDTH + 1]; 56 char weeks[MAX_WIDTH + 1]; 57 }; 58 59 struct weekdays { 60 char names[7][4]; 61 }; 62 63 /* The switches from Julian to Gregorian in some countries */ 64 static struct djswitch { 65 char *cc; /* Country code according to ISO 3166 */ 66 char *nm; /* Name of country */ 67 date dt; /* Last day of Julian calendar */ 68 } switches[] = { 69 {"AL", "Albania", {1912, 11, 30}}, 70 {"AT", "Austria", {1583, 10, 5}}, 71 {"AU", "Australia", {1752, 9, 2}}, 72 {"BE", "Belgium", {1582, 12, 14}}, 73 {"BG", "Bulgaria", {1916, 3, 18}}, 74 {"CA", "Canada", {1752, 9, 2}}, 75 {"CH", "Switzerland", {1655, 2, 28}}, 76 {"CN", "China", {1911, 12, 18}}, 77 {"CZ", "Czech Republic",{1584, 1, 6}}, 78 {"DE", "Germany", {1700, 2, 18}}, 79 {"DK", "Denmark", {1700, 2, 18}}, 80 {"ES", "Spain", {1582, 10, 4}}, 81 {"FI", "Finland", {1753, 2, 17}}, 82 {"FR", "France", {1582, 12, 9}}, 83 {"GB", "United Kingdom",{1752, 9, 2}}, 84 {"GR", "Greece", {1924, 3, 9}}, 85 {"HU", "Hungary", {1587, 10, 21}}, 86 {"IS", "Iceland", {1700, 11, 16}}, 87 {"IT", "Italy", {1582, 10, 4}}, 88 {"JP", "Japan", {1918, 12, 18}}, 89 {"LI", "Lithuania", {1918, 2, 1}}, 90 {"LN", "Latin", {9999, 05, 31}}, 91 {"LU", "Luxembourg", {1582, 12, 14}}, 92 {"LV", "Latvia", {1918, 2, 1}}, 93 {"NL", "Netherlands", {1582, 12, 14}}, 94 {"NO", "Norway", {1700, 2, 18}}, 95 {"PL", "Poland", {1582, 10, 4}}, 96 {"PT", "Portugal", {1582, 10, 4}}, 97 {"RO", "Romania", {1919, 3, 31}}, 98 {"RU", "Russia", {1918, 1, 31}}, 99 {"SI", "Slovenia", {1919, 3, 4}}, 100 {"SU", "USSR", {1920, 3, 4}}, 101 {"SW", "Sweden", {1753, 2, 17}}, 102 {"TR", "Turkey", {1926, 12, 18}}, 103 {"US", "United States", {1752, 9, 2}}, 104 {"YU", "Yugoslavia", {1919, 3, 4}} 105 }; 106 107 struct djswitch *dftswitch = 108 switches + sizeof(switches) / sizeof(struct djswitch) - 2; 109 /* default switch (should be "US") */ 110 111 /* Table used to print day of month and week numbers */ 112 char daystr[] = " 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15" 113 " 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31" 114 " 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47" 115 " 48 49 50 51 52 53"; 116 117 /* Table used to print day of year and week numbers */ 118 char jdaystr[] = " 1 2 3 4 5 6 7 8 9" 119 " 10 11 12 13 14 15 16 17 18 19" 120 " 20 21 22 23 24 25 26 27 28 29" 121 " 30 31 32 33 34 35 36 37 38 39" 122 " 40 41 42 43 44 45 46 47 48 49" 123 " 50 51 52 53 54 55 56 57 58 59" 124 " 60 61 62 63 64 65 66 67 68 69" 125 " 70 71 72 73 74 75 76 77 78 79" 126 " 80 81 82 83 84 85 86 87 88 89" 127 " 90 91 92 93 94 95 96 97 98 99" 128 " 100 101 102 103 104 105 106 107 108 109" 129 " 110 111 112 113 114 115 116 117 118 119" 130 " 120 121 122 123 124 125 126 127 128 129" 131 " 130 131 132 133 134 135 136 137 138 139" 132 " 140 141 142 143 144 145 146 147 148 149" 133 " 150 151 152 153 154 155 156 157 158 159" 134 " 160 161 162 163 164 165 166 167 168 169" 135 " 170 171 172 173 174 175 176 177 178 179" 136 " 180 181 182 183 184 185 186 187 188 189" 137 " 190 191 192 193 194 195 196 197 198 199" 138 " 200 201 202 203 204 205 206 207 208 209" 139 " 210 211 212 213 214 215 216 217 218 219" 140 " 220 221 222 223 224 225 226 227 228 229" 141 " 230 231 232 233 234 235 236 237 238 239" 142 " 240 241 242 243 244 245 246 247 248 249" 143 " 250 251 252 253 254 255 256 257 258 259" 144 " 260 261 262 263 264 265 266 267 268 269" 145 " 270 271 272 273 274 275 276 277 278 279" 146 " 280 281 282 283 284 285 286 287 288 289" 147 " 290 291 292 293 294 295 296 297 298 299" 148 " 300 301 302 303 304 305 306 307 308 309" 149 " 310 311 312 313 314 315 316 317 318 319" 150 " 320 321 322 323 324 325 326 327 328 329" 151 " 330 331 332 333 334 335 336 337 338 339" 152 " 340 341 342 343 344 345 346 347 348 349" 153 " 350 351 352 353 354 355 356 357 358 359" 154 " 360 361 362 363 364 365 366"; 155 156 int flag_weeks; /* user wants number of week */ 157 int nswitch; /* user defined switch date */ 158 int nswitchb; /* switch date for backward compatibility */ 159 160 char *center(char *s, char *t, int w); 161 void mkmonth(int year, int month, int jd_flag, struct monthlines * monthl); 162 void mkmonthb(int year, int month, int jd_flag, struct monthlines * monthl); 163 void mkweekdays(struct weekdays * wds); 164 void printcc(void); 165 void printeaster(int year, int julian, int orthodox); 166 void printmonth(int year, int month, int jd_flag); 167 void printmonthb(int year, int month, int jd_flag); 168 void printyear(int year, int jd_flag); 169 void printyearb(int year, int jd_flag); 170 int firstday(int y, int m); 171 date *sdate(int ndays, struct date * d); 172 date *sdateb(int ndays, struct date * d); 173 int sndays(struct date * d); 174 int sndaysb(struct date * d); 175 static void usage(void); 176 int weekdayb(int nd); 177 178 int 179 main(int argc, char *argv[]) 180 { 181 struct djswitch *p, *q; /* to search user defined switch date */ 182 date never = {10000, 1, 1}; /* outside valid range of dates */ 183 date ukswitch = {1752, 9, 2};/* switch date for Great Britain */ 184 int ch; /* holds the option character */ 185 int m = 0; /* month */ 186 int y = 0; /* year */ 187 int flag_backward = 0; /* user called cal--backward compat. */ 188 int flag_hole_year = 0; /* user wants the whole year */ 189 int flag_julian_cal = 0; /* user wants Julian Calendar */ 190 int flag_julian_day = 0; /* user wants the Julian day 191 * numbers */ 192 int flag_orthodox = 0; /* use wants Orthodox easter */ 193 int flag_easter = 0; /* use wants easter date */ 194 char *cp; /* character pointer */ 195 char *locale; /* locale to get country code */ 196 197 /* 198 * Use locale to determine the country code, 199 * and use the country code to determine the default 200 * switchdate and date format from the switches table. 201 */ 202 if ((locale = setlocale(LC_TIME, "")) == NULL) 203 warn("setlocale"); 204 if (locale == NULL || locale == "C") 205 locale = "_US"; 206 q = switches + sizeof(switches) / sizeof(struct djswitch); 207 for (p = switches; p != q; p++) 208 if ((cp = strstr(locale, p->cc)) != NULL && *(cp - 1) == '_') 209 break; 210 if (p == q) { 211 nswitch = ndaysj(&dftswitch->dt); 212 } else { 213 nswitch = ndaysj(&p->dt); 214 dftswitch = p; 215 } 216 217 218 /* 219 * Get the filename portion of argv[0] and set flag_backward if 220 * this program is called "cal". 221 */ 222 for (cp = argv[0]; *cp; cp++) 223 ; 224 while (cp >= argv[0] && *cp != '/') 225 cp--; 226 if (strcmp("cal", ++cp) == 0) 227 flag_backward = 1; 228 229 /* Set the switch date to United Kingdom if backwards compatible */ 230 if (flag_backward) 231 nswitchb = ndaysj(&ukswitch); 232 233 while ((ch = getopt(argc, argv, "Jejops:wy")) != -1) 234 switch (ch) { 235 case 'J': 236 if (flag_backward) 237 usage(); 238 nswitch = ndaysj(&never); 239 flag_julian_cal = 1; 240 break; 241 case 'e': 242 if (flag_backward) 243 usage(); 244 flag_easter = 1; 245 break; 246 case 'j': 247 flag_julian_day = 1; 248 break; 249 case 'o': 250 if (flag_backward) 251 usage(); 252 flag_orthodox = 1; 253 flag_easter = 1; 254 break; 255 case 'p': 256 if (flag_backward) 257 usage(); 258 printcc(); 259 return (0); 260 break; 261 case 's': 262 if (flag_backward) 263 usage(); 264 q = switches + 265 sizeof(switches) / sizeof(struct djswitch); 266 for (p = switches; 267 p != q && strcmp(p->cc, optarg) != 0; p++) 268 ; 269 if (p == q) 270 errx(EX_USAGE, 271 "%s: invalid country code", optarg); 272 nswitch = ndaysj(&(p->dt)); 273 break; 274 case 'w': 275 if (flag_backward) 276 usage(); 277 flag_weeks = 1; 278 break; 279 case 'y': 280 flag_hole_year = 1; 281 break; 282 default: 283 usage(); 284 } 285 286 argc -= optind; 287 argv += optind; 288 289 if (argc == 0) { 290 time_t t; 291 struct tm *tm; 292 293 t = time(NULL); 294 tm = localtime(&t); 295 y = tm->tm_year + 1900; 296 m = tm->tm_mon + 1; 297 } 298 299 switch (argc) { 300 case 2: 301 if (flag_easter) 302 usage(); 303 m = atoi(*argv++); 304 if (m < 1 || m > 12) 305 errx(EX_USAGE, "month %d not in range 1..12", m); 306 /* FALLTHROUGH */ 307 case 1: 308 y = atoi(*argv++); 309 if (y < 1 || y > 9999) 310 errx(EX_USAGE, "year %d not in range 1..9999", y); 311 break; 312 case 0: 313 break; 314 default: 315 usage(); 316 } 317 318 if (flag_easter) 319 printeaster(y, flag_julian_cal, flag_orthodox); 320 else if (argc == 1 || flag_hole_year) 321 if (flag_backward) 322 printyearb(y, flag_julian_day); 323 else 324 printyear(y, flag_julian_day); 325 else 326 if (flag_backward) 327 printmonthb(y, m, flag_julian_day); 328 else 329 printmonth(y, m, flag_julian_day); 330 331 return (0); 332 } 333 334 static void 335 usage(void) 336 { 337 338 fprintf(stderr, "%s\n%s\n%s\n", 339 "usage: cal [-jy] [[month] year]", 340 " ncal [-Jjpwy] [-s country_code] [[month] year]", 341 " ncal [-Jeo] [year]"); 342 exit(EX_USAGE); 343 } 344 345 /* print the assumed switches for all countries */ 346 void 347 printcc(void) 348 { 349 struct djswitch *p; 350 int n; /* number of lines to print */ 351 int m; /* offset from left to right table entry on the same line */ 352 353 #define FSTR "%c%s %-15s%4d-%02d-%02d" 354 #define DFLT(p) ((p) == dftswitch ? '*' : ' ') 355 #define FSTRARG(p) DFLT(p), (p)->cc, (p)->nm, (p)->dt.y, (p)->dt.m, (p)->dt.d 356 357 n = sizeof(switches) / sizeof(struct djswitch); 358 m = (n + 1) / 2; 359 n /= 2; 360 for (p = switches; p != switches + n; p++) 361 printf(FSTR" "FSTR"\n", FSTRARG(p), FSTRARG(p+m)); 362 if (m != n) 363 printf(FSTR"\n", FSTRARG(p)); 364 } 365 366 /* print the date of easter sunday */ 367 void 368 printeaster(int y, int julian, int orthodox) 369 { 370 date dt; 371 struct tm tm; 372 char buf[80]; 373 374 /* force orthodox easter for years before 1583 */ 375 if (y < 1583) 376 orthodox = 1; 377 378 if (orthodox) 379 if (julian) 380 easteroj(y, &dt); 381 else 382 easterog(y, &dt); 383 else 384 easterg(y, &dt); 385 386 memset(&tm, 0, sizeof(tm)); 387 tm.tm_year = dt.y - 1900; 388 tm.tm_mon = dt.m - 1; 389 tm.tm_mday = dt.d; 390 strftime(buf, sizeof(buf), "%EF %Y", &tm); 391 printf("%s\n", buf); 392 } 393 394 void 395 printmonth(int y, int m, int jd_flag) 396 { 397 struct monthlines month; 398 struct weekdays wds; 399 int i; 400 401 mkmonth(y, m - 1, jd_flag, &month); 402 mkweekdays(&wds); 403 printf(" %s %d\n", month.name, y); 404 for (i = 0; i != 7; i++) 405 printf("%.2s%s\n", wds.names[i], month.lines[i]); 406 if (flag_weeks) 407 printf(" %s\n", month.weeks); 408 } 409 410 void 411 printmonthb(int y, int m, int jd_flag) 412 { 413 struct monthlines month; 414 struct weekdays wds; 415 char s[MAX_WIDTH], t[MAX_WIDTH]; 416 int i; 417 int mw; 418 419 mkmonthb(y, m - 1, jd_flag, &month); 420 mkweekdays(&wds); 421 422 mw = jd_flag ? MONTH_WIDTH_B_J : MONTH_WIDTH_B; 423 424 sprintf(s, "%s %d", month.name, y); 425 printf("%s\n", center(t, s, mw)); 426 427 if (jd_flag) 428 printf(" %s %s %s %s %s %s %.2s\n", wds.names[6], wds.names[0], 429 wds.names[1], wds.names[2], wds.names[3], 430 wds.names[4], wds.names[5]); 431 else 432 printf("%s%s%s%s%s%s%.2s\n", wds.names[6], wds.names[0], 433 wds.names[1], wds.names[2], wds.names[3], 434 wds.names[4], wds.names[5]); 435 436 for (i = 0; i != 6; i++) 437 printf("%s\n", month.lines[i]+1); 438 } 439 440 void 441 printyear(int y, int jd_flag) 442 { 443 struct monthlines year[12]; 444 struct weekdays wds; 445 char s[80], t[80]; 446 int i, j; 447 int mpl; 448 int mw; 449 450 for (i = 0; i != 12; i++) 451 mkmonth(y, i, jd_flag, year + i); 452 mkweekdays(&wds); 453 mpl = jd_flag ? 3 : 4; 454 mw = jd_flag ? MONTH_WIDTH_J : MONTH_WIDTH; 455 456 sprintf(s, "%d", y); 457 printf("%s\n", center(t, s, mpl * mw)); 458 459 for (j = 0; j != 12; j += mpl) { 460 printf(" %-*s%-*s", 461 mw, year[j].name, 462 mw, year[j + 1].name); 463 if (mpl == 3) 464 printf("%s\n", year[j + 2].name); 465 else 466 printf("%-*s%s\n", 467 mw, year[j + 2].name, 468 year[j + 3].name); 469 for (i = 0; i != 7; i++) { 470 printf("%.2s%-*s%-*s", 471 wds.names[i], 472 mw, year[j].lines[i], 473 mw, year[j + 1].lines[i]); 474 if (mpl == 3) 475 printf("%s\n", year[j + 2].lines[i]); 476 else 477 printf("%-*s%s\n", 478 mw, year[j + 2].lines[i], 479 year[j + 3].lines[i]); 480 } 481 if (flag_weeks) { 482 if (mpl == 3) 483 printf(" %-*s%-*s%-s\n", 484 mw, year[j].weeks, 485 mw, year[j + 1].weeks, 486 year[j + 2].weeks); 487 else 488 printf(" %-*s%-*s%-*s%-s\n", 489 mw, year[j].weeks, 490 mw, year[j + 1].weeks, 491 mw, year[j + 2].weeks, 492 year[j + 3].weeks); 493 } 494 } 495 } 496 497 void 498 printyearb(int y, int jd_flag) 499 { 500 struct monthlines year[12]; 501 struct weekdays wds; 502 char s[80], t[80]; 503 int i, j; 504 int mpl; 505 int mw; 506 507 for (i = 0; i != 12; i++) 508 mkmonthb(y, i, jd_flag, year + i); 509 mkweekdays(&wds); 510 mpl = jd_flag ? 2 : 3; 511 mw = jd_flag ? MONTH_WIDTH_B_J : MONTH_WIDTH_B; 512 513 sprintf(s, "%d", y); 514 printf("%s\n\n", center(t, s, mw * mpl + mpl)); 515 516 for (j = 0; j != 12; j += mpl) { 517 printf("%-*s ", mw, center(s, year[j].name, mw)); 518 if (mpl == 2) 519 printf("%s\n", center(s, year[j + 1].name, mw)); 520 else 521 printf("%-*s %s\n", mw, 522 center(s, year[j + 1].name, mw), 523 center(t, year[j + 2].name, mw)); 524 525 if (mpl == 2) 526 printf(" %s %s %s %s %s %s %s " 527 " %s %s %s %s %s %s %.2s\n", 528 wds.names[6], wds.names[0], wds.names[1], 529 wds.names[2], wds.names[3], wds.names[4], 530 wds.names[5], 531 wds.names[6], wds.names[0], wds.names[1], 532 wds.names[2], wds.names[3], wds.names[4], 533 wds.names[5]); 534 else 535 printf("%s%s%s%s%s%s%s " 536 "%s%s%s%s%s%s%s " 537 "%s%s%s%s%s%s%.2s\n", 538 wds.names[6], wds.names[0], wds.names[1], 539 wds.names[2], wds.names[3], wds.names[4], 540 wds.names[5], 541 wds.names[6], wds.names[0], wds.names[1], 542 wds.names[2], wds.names[3], wds.names[4], 543 wds.names[5], 544 wds.names[6], wds.names[0], wds.names[1], 545 wds.names[2], wds.names[3], wds.names[4], 546 wds.names[5]); 547 for (i = 0; i != 6; i++) { 548 if (mpl == 2) 549 printf("%-*s %s\n", 550 mw, year[j].lines[i]+1, 551 year[j + 1].lines[i]+1); 552 else 553 printf("%-*s %-*s %s\n", 554 mw, year[j].lines[i]+1, 555 mw, year[j + 1].lines[i]+1, 556 year[j + 2].lines[i]+1); 557 558 } 559 } 560 } 561 562 void 563 mkmonth(int y, int m, int jd_flag, struct monthlines *mlines) 564 { 565 566 struct tm tm; /* for strftime printing local names of 567 * months */ 568 date dt; /* handy date */ 569 int dw; /* width of numbers */ 570 int first; /* first day of month */ 571 int firstm; /* first day of first week of month */ 572 int i, j, k; /* just indices */ 573 int last; /* the first day of next month */ 574 int jan1 = 0; /* the first day of this year */ 575 char *ds; /* pointer to day strings (daystr or 576 * jdaystr) */ 577 578 /* Set name of month. */ 579 memset(&tm, 0, sizeof(tm)); 580 tm.tm_mon = m; 581 strftime(mlines->name, sizeof(mlines->name), "%OB", &tm); 582 583 /* 584 * Set first and last to the day number of the first day of this 585 * month and the first day of next month respectively. Set jan1 to 586 * the day number of the first day of this year. 587 */ 588 first = firstday(y, m + 1); 589 if (m == 11) 590 last = firstday(y + 1, 1); 591 else 592 last = firstday(y, m + 2); 593 594 if (jd_flag) 595 jan1 = firstday(y, 1); 596 597 /* 598 * Set firstm to the day number of monday of the first week of 599 * this month. (This might be in the last month) 600 */ 601 firstm = first - weekday(first); 602 603 /* Set ds (daystring) and dw (daywidth) according to the jd_flag */ 604 if (jd_flag) { 605 ds = jdaystr; 606 dw = 4; 607 } else { 608 ds = daystr; 609 dw = 3; 610 } 611 612 /* 613 * Fill the lines with day of month or day of year (julian day) 614 * line index: i, each line is one weekday. column index: j, each 615 * column is one day number. print column index: k. 616 */ 617 for (i = 0; i != 7; i++) { 618 for (j = firstm + i, k = 0; j < last; j += 7, k += dw) 619 if (j >= first) { 620 if (jd_flag) 621 dt.d = j - jan1 + 1; 622 else 623 sdate(j, &dt); 624 memcpy(mlines->lines[i] + k, 625 ds + dt.d * dw, dw); 626 } else 627 memcpy(mlines->lines[i] + k, " ", dw); 628 mlines->lines[i][k] = '\0'; 629 630 } 631 632 /* fill the weeknumbers */ 633 if (flag_weeks) { 634 for (j = firstm, k = 0; j < last; k += dw, j += 7) 635 if (j <= nswitch) 636 memset(mlines->weeks + k, ' ', dw); 637 else 638 memcpy(mlines->weeks + k, 639 ds + week(j, &i)*dw, dw); 640 mlines->weeks[k] = '\0'; 641 } 642 } 643 644 void 645 mkmonthb(int y, int m, int jd_flag, struct monthlines *mlines) 646 { 647 648 struct tm tm; /* for strftime printing local names of 649 * months */ 650 date dt; /* handy date */ 651 int dw; /* width of numbers */ 652 int first; /* first day of month */ 653 int firsts; /* sunday of first week of month */ 654 int i, j, k; /* just indices */ 655 int jan1 = 0; /* the first day of this year */ 656 int last; /* the first day of next month */ 657 char *ds; /* pointer to day strings (daystr or 658 * jdaystr) */ 659 660 /* Set ds (daystring) and dw (daywidth) according to the jd_flag */ 661 if (jd_flag) { 662 ds = jdaystr; 663 dw = 4; 664 } else { 665 ds = daystr; 666 dw = 3; 667 } 668 669 /* Set name of month centered */ 670 memset(&tm, 0, sizeof(tm)); 671 tm.tm_mon = m; 672 strftime(mlines->name, sizeof(mlines->name), "%OB", &tm); 673 674 /* 675 * Set first and last to the day number of the first day of this 676 * month and the first day of next month respectively. Set jan1 to 677 * the day number of Jan 1st of this year. 678 */ 679 dt.y = y; 680 dt.m = m + 1; 681 dt.d = 1; 682 first = sndaysb(&dt); 683 if (m == 11) { 684 dt.y = y + 1; 685 dt.m = 1; 686 dt.d = 1; 687 } else { 688 dt.y = y; 689 dt.m = m + 2; 690 dt.d = 1; 691 } 692 last = sndaysb(&dt); 693 694 if (jd_flag) { 695 dt.y = y; 696 dt.m = 1; 697 dt.d = 1; 698 jan1 = sndaysb(&dt); 699 } 700 701 /* 702 * Set firsts to the day number of sunday of the first week of 703 * this month. (This might be in the last month) 704 */ 705 firsts = first - (weekday(first)+1) % 7; 706 707 /* 708 * Fill the lines with day of month or day of year (Julian day) 709 * line index: i, each line is one week. column index: j, each 710 * column is one day number. print column index: k. 711 */ 712 for (i = 0; i != 6; i++) { 713 for (j = firsts + 7 * i, k = 0; j < last && k != dw * 7; 714 j++, k += dw) 715 if (j >= first) { 716 if (jd_flag) 717 dt.d = j - jan1 + 1; 718 else 719 sdateb(j, &dt); 720 memcpy(mlines->lines[i] + k, 721 ds + dt.d * dw, dw); 722 } else 723 memcpy(mlines->lines[i] + k, " ", dw); 724 if (k == 0) 725 mlines->lines[i][1] = '\0'; 726 else 727 mlines->lines[i][k] = '\0'; 728 } 729 } 730 731 /* Put the local names of weekdays into the wds */ 732 void 733 mkweekdays(struct weekdays *wds) 734 { 735 int i; 736 struct tm tm; 737 738 memset(&tm, 0, sizeof(tm)); 739 740 for (i = 0; i != 7; i++) { 741 tm.tm_wday = (i+1) % 7; 742 strftime(wds->names[i], 4, "%a", &tm); 743 wds->names[i][2] = ' '; 744 } 745 } 746 747 /* 748 * Compute the day number of the first 749 * existing date after the first day in month. 750 * (the first day in month and even the month might not exist!) 751 */ 752 int 753 firstday(int y, int m) 754 { 755 date dt; 756 int nd; 757 758 dt.y = y; 759 dt.m = m; 760 dt.d = 1; 761 nd = sndays(&dt); 762 for (;;) { 763 sdate(nd, &dt); 764 if ((dt.m >= m && dt.y == y) || dt.y > y) 765 return (nd); 766 else 767 nd++; 768 } 769 /* NEVER REACHED */ 770 } 771 772 /* 773 * Compute the number of days from date, obey the local switch from 774 * Julian to Gregorian if specified by the user. 775 */ 776 int 777 sndays(struct date *d) 778 { 779 780 if (nswitch != 0) 781 if (nswitch < ndaysj(d)) 782 return (ndaysg(d)); 783 else 784 return (ndaysj(d)); 785 else 786 return ndaysg(d); 787 } 788 789 /* 790 * Compute the number of days from date, obey the switch from 791 * Julian to Gregorian as used by UK and her colonies. 792 */ 793 int 794 sndaysb(struct date *d) 795 { 796 797 if (nswitchb < ndaysj(d)) 798 return (ndaysg(d)); 799 else 800 return (ndaysj(d)); 801 } 802 803 /* Inverse of sndays */ 804 struct date * 805 sdate(int nd, struct date *d) 806 { 807 808 if (nswitch < nd) 809 return (gdate(nd, d)); 810 else 811 return (jdate(nd, d)); 812 } 813 814 /* Inverse of sndaysb */ 815 struct date * 816 sdateb(int nd, struct date *d) 817 { 818 819 if (nswitchb < nd) 820 return (gdate(nd, d)); 821 else 822 return (jdate(nd, d)); 823 } 824 825 /* Center string t in string s of length w by putting enough leading blanks */ 826 char * 827 center(char *s, char *t, int w) 828 { 829 char blanks[80]; 830 831 memset(blanks, ' ', sizeof(blanks)); 832 sprintf(s, "%.*s%s", (int)(w - strlen(t)) / 2, blanks, t); 833 return (s); 834 } 835