ncal.c revision 45064
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 28static const char rcsid[] = 29 "$Id: ncal.c,v 1.6 1998/01/15 10:23:34 helbig Exp $"; 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 51typedef struct date date; 52 53struct monthlines { 54 char name[MAX_WIDTH + 1]; 55 char lines[7][MAX_WIDTH + 1]; 56 char weeks[MAX_WIDTH + 1]; 57}; 58 59struct weekdays { 60 char names[7][4]; 61}; 62 63/* The switches from Julian to Gregorian in some countries */ 64static 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 char *efmt; /* strftime format for printing date of easter */ 69} switches[] = { 70 {"AL", "Albania", {1912, 11, 30}, "%e %B %Y"}, 71 {"AT", "Austria", {1583, 10, 5}, "%e. %B %Y"}, 72 {"AU", "Australia", {1752, 9, 2}, "%B %e, %Y"}, 73 {"BE", "Belgium", {1582, 12, 14}, "%B %e, %Y"}, 74 {"BG", "Bulgaria", {1916, 3, 18}, "%e %B %Y"}, 75 {"CA", "Canada", {1752, 9, 2}, "%B %e, %Y"}, 76 {"CH", "Switzerland", {1655, 2, 28}, "%e. %B %Y"}, 77 {"CN", "China", {1911, 12, 18}, "%e %B %Y"}, 78 {"CZ", "Czech Republic",{1584, 1, 6}, "%e %B %Y"}, 79 {"DE", "Germany", {1700, 2, 18}, "%e. %B %Y"}, 80 {"DK", "Denmark", {1700, 2, 18}, "%e. %B %Y"}, 81 {"ES", "Spain", {1582, 10, 4}, "%e de %B de %Y"}, 82 {"FI", "Finland", {1753, 2, 17}, "%e %B %Y"}, 83 {"FR", "France", {1582, 12, 9}, "%e. %B %Y"}, 84 {"GB", "United Kingdom",{1752, 9, 2}, "%e %B %Y"}, 85 {"GR", "Greece", {1924, 3, 9}, "%e %B %Y"}, 86 {"HU", "Hungary", {1587, 10, 21}, "%e %B %Y"}, 87 {"IS", "Iceland", {1700, 11, 16}, "%e %B %Y"}, 88 {"IT", "Italy", {1582, 10, 4}, "%e %B %Y"}, 89 {"JP", "Japan", {1918, 12, 18}, "%Y\x94N %B%e"}, 90 {"LI", "Lithuania", {1918, 2, 1}, "%e %B %Y"}, 91 {"LN", "Latin", {9999, 05, 31}, "%e %B %Y"}, 92 {"LU", "Luxembourg", {1582, 12, 14}, "%e %B %Y"}, 93 {"LV", "Latvia", {1918, 2, 1}, "%e %B %Y"}, 94 {"NL", "Netherlands", {1582, 12, 14}, "%e %B %Y"}, 95 {"NO", "Norway", {1700, 2, 18}, "%e %B %Y"}, 96 {"PL", "Poland", {1582, 10, 4}, "%e %B %Y"}, 97 {"PT", "Portugal", {1582, 10, 4}, "%e %B %Y"}, 98 {"RO", "Romania", {1919, 3, 31}, "%e %B %Y"}, 99 {"RU", "Russia", {1918, 1, 31}, "%e %B %Y"}, 100 {"SI", "Slovenia", {1919, 3, 4}, "%e %B %Y"}, 101 {"SU", "USSR", {1920, 3, 4}, "%e %B %Y"}, 102 {"SW", "Sweden", {1753, 2, 17}, "%e %B %Y"}, 103 {"TR", "Turkey", {1926, 12, 18}, "%e %B %Y"}, 104 {"US", "United States", {1752, 9, 2}, "%B %e, %Y"}, 105 {"YU", "Yugoslavia", {1919, 3, 4}, "%e %B %Y"} 106}; 107 108struct djswitch *dftswitch = 109 switches + sizeof(switches) / sizeof(struct djswitch) - 2; 110 /* default switch (should be "US") */ 111 112/* Table used to print day of month and week numbers */ 113char daystr[] = " 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15" 114 " 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31" 115 " 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47" 116 " 48 49 50 51 52 53"; 117 118/* Table used to print day of year and week numbers */ 119char jdaystr[] = " 1 2 3 4 5 6 7 8 9" 120 " 10 11 12 13 14 15 16 17 18 19" 121 " 20 21 22 23 24 25 26 27 28 29" 122 " 30 31 32 33 34 35 36 37 38 39" 123 " 40 41 42 43 44 45 46 47 48 49" 124 " 50 51 52 53 54 55 56 57 58 59" 125 " 60 61 62 63 64 65 66 67 68 69" 126 " 70 71 72 73 74 75 76 77 78 79" 127 " 80 81 82 83 84 85 86 87 88 89" 128 " 90 91 92 93 94 95 96 97 98 99" 129 " 100 101 102 103 104 105 106 107 108 109" 130 " 110 111 112 113 114 115 116 117 118 119" 131 " 120 121 122 123 124 125 126 127 128 129" 132 " 130 131 132 133 134 135 136 137 138 139" 133 " 140 141 142 143 144 145 146 147 148 149" 134 " 150 151 152 153 154 155 156 157 158 159" 135 " 160 161 162 163 164 165 166 167 168 169" 136 " 170 171 172 173 174 175 176 177 178 179" 137 " 180 181 182 183 184 185 186 187 188 189" 138 " 190 191 192 193 194 195 196 197 198 199" 139 " 200 201 202 203 204 205 206 207 208 209" 140 " 210 211 212 213 214 215 216 217 218 219" 141 " 220 221 222 223 224 225 226 227 228 229" 142 " 230 231 232 233 234 235 236 237 238 239" 143 " 240 241 242 243 244 245 246 247 248 249" 144 " 250 251 252 253 254 255 256 257 258 259" 145 " 260 261 262 263 264 265 266 267 268 269" 146 " 270 271 272 273 274 275 276 277 278 279" 147 " 280 281 282 283 284 285 286 287 288 289" 148 " 290 291 292 293 294 295 296 297 298 299" 149 " 300 301 302 303 304 305 306 307 308 309" 150 " 310 311 312 313 314 315 316 317 318 319" 151 " 320 321 322 323 324 325 326 327 328 329" 152 " 330 331 332 333 334 335 336 337 338 339" 153 " 340 341 342 343 344 345 346 347 348 349" 154 " 350 351 352 353 354 355 356 357 358 359" 155 " 360 361 362 363 364 365 366"; 156 157int flag_weeks; /* user wants number of week */ 158int nswitch; /* user defined switch date */ 159int nswitchb; /* switch date for backward compatibility */ 160char *efmt; /* strftime format string for printeaster() */ 161 162char *center(char *s, char *t, int w); 163void mkmonth(int year, int month, int jd_flag, struct monthlines * monthl); 164void mkmonthb(int year, int month, int jd_flag, struct monthlines * monthl); 165void mkweekdays(struct weekdays * wds); 166void printcc(void); 167void printeaster(int year, int julian, int orthodox); 168void printmonth(int year, int month, int jd_flag); 169void printmonthb(int year, int month, int jd_flag); 170void printyear(int year, int jd_flag); 171void printyearb(int year, int jd_flag); 172int firstday(int y, int m); 173date *sdate(int ndays, struct date * d); 174date *sdateb(int ndays, struct date * d); 175int sndays(struct date * d); 176int sndaysb(struct date * d); 177static void usage(void); 178int weekdayb(int nd); 179 180int 181main(int argc, char *argv[]) 182{ 183 struct djswitch *p, *q; /* to search user defined switch date */ 184 date never = {10000, 1, 1}; /* outside valid range of dates */ 185 date ukswitch = {1752, 9, 2};/* switch date for Great Britain */ 186 int ch; /* holds the option character */ 187 int m = 0; /* month */ 188 int y = 0; /* year */ 189 int flag_backward = 0; /* user called cal--backward compat. */ 190 int flag_hole_year = 0; /* user wants the whole year */ 191 int flag_julian_cal = 0; /* user wants Julian Calendar */ 192 int flag_julian_day = 0; /* user wants the Julian day 193 * numbers */ 194 int flag_orthodox = 0; /* use wants Orthodox easter */ 195 int flag_easter = 0; /* use wants easter date */ 196 char *cp; /* character pointer */ 197 char *locale; /* locale to get country code */ 198 199 /* 200 * Use locale to determine the country code, 201 * and use the country code to determine the default 202 * switchdate and date format from the switches table. 203 */ 204 if ((locale = setlocale(LC_TIME, "")) == NULL) 205 warn("setlocale"); 206 if (locale == NULL || locale == "C") 207 locale = "_US"; 208 q = switches + sizeof(switches) / sizeof(struct djswitch); 209 for (p = switches; p != q; p++) 210 if ((cp = strstr(locale, p->cc)) != NULL && *(cp - 1) == '_') 211 break; 212 if (p == q) { 213 nswitch = ndaysj(&dftswitch->dt); 214 efmt = dftswitch->efmt; 215 } else { 216 nswitch = ndaysj(&p->dt); 217 efmt = p->efmt; 218 dftswitch = p; 219 } 220 221 222 /* 223 * Get the filename portion of argv[0] and set flag_backward if 224 * this program is called "cal". 225 */ 226 for (cp = argv[0]; *cp; cp++) 227 ; 228 while (cp >= argv[0] && *cp != '/') 229 cp--; 230 if (strcmp("cal", ++cp) == 0) 231 flag_backward = 1; 232 233 /* Set the switch date to United Kingdom if backwards compatible */ 234 if (flag_backward) 235 nswitchb = ndaysj(&ukswitch); 236 237 while ((ch = getopt(argc, argv, "Jejops:wy")) != -1) 238 switch (ch) { 239 case 'J': 240 if (flag_backward) 241 usage(); 242 nswitch = ndaysj(&never); 243 flag_julian_cal = 1; 244 break; 245 case 'e': 246 if (flag_backward) 247 usage(); 248 flag_easter = 1; 249 break; 250 case 'j': 251 flag_julian_day = 1; 252 break; 253 case 'o': 254 if (flag_backward) 255 usage(); 256 flag_orthodox = 1; 257 flag_easter = 1; 258 break; 259 case 'p': 260 if (flag_backward) 261 usage(); 262 printcc(); 263 return (0); 264 break; 265 case 's': 266 if (flag_backward) 267 usage(); 268 q = switches + 269 sizeof(switches) / sizeof(struct djswitch); 270 for (p = switches; 271 p != q && strcmp(p->cc, optarg) != 0; p++) 272 ; 273 if (p == q) 274 errx(EX_USAGE, 275 "%s: invalid country code", optarg); 276 nswitch = ndaysj(&(p->dt)); 277 break; 278 case 'w': 279 if (flag_backward) 280 usage(); 281 flag_weeks = 1; 282 break; 283 case 'y': 284 flag_hole_year = 1; 285 break; 286 default: 287 usage(); 288 } 289 290 argc -= optind; 291 argv += optind; 292 293 if (argc == 0) { 294 time_t t; 295 struct tm *tm; 296 297 t = time(NULL); 298 tm = localtime(&t); 299 y = tm->tm_year + 1900; 300 m = tm->tm_mon + 1; 301 } 302 303 switch (argc) { 304 case 2: 305 if (flag_easter) 306 usage(); 307 m = atoi(*argv++); 308 if (m < 1 || m > 12) 309 errx(EX_USAGE, "month %d not in range 1..12", m); 310 /* FALLTHROUGH */ 311 case 1: 312 y = atoi(*argv++); 313 if (y < 1 || y > 9999) 314 errx(EX_USAGE, "year %d not in range 1..9999", y); 315 break; 316 case 0: 317 break; 318 default: 319 usage(); 320 } 321 322 if (flag_easter) 323 printeaster(y, flag_julian_cal, flag_orthodox); 324 else if (argc == 1 || flag_hole_year) 325 if (flag_backward) 326 printyearb(y, flag_julian_day); 327 else 328 printyear(y, flag_julian_day); 329 else 330 if (flag_backward) 331 printmonthb(y, m, flag_julian_day); 332 else 333 printmonth(y, m, flag_julian_day); 334 335 return (0); 336} 337 338static void 339usage(void) 340{ 341 342 fprintf(stderr, "%s\n%s\n%s\n", 343 "usage: cal [-jy] [[month] year]", 344 " ncal [-Jjpwy] [-s country_code] [[month] year]", 345 " ncal [-Jeo] [year]"); 346 exit(EX_USAGE); 347} 348 349/* print the assumed switches for all countries */ 350void 351printcc(void) 352{ 353 struct djswitch *p; 354 int n; /* number of lines to print */ 355 int m; /* offset from left to right table entry on the same line */ 356 357#define FSTR "%c%s %-15s%4d-%02d-%02d" 358#define DFLT(p) ((p) == dftswitch ? '*' : ' ') 359#define FSTRARG(p) DFLT(p), (p)->cc, (p)->nm, (p)->dt.y, (p)->dt.m, (p)->dt.d 360 361 n = sizeof(switches) / sizeof(struct djswitch); 362 m = (n + 1) / 2; 363 n /= 2; 364 for (p = switches; p != switches + n; p++) 365 printf(FSTR" "FSTR"\n", FSTRARG(p), FSTRARG(p+m)); 366 if (m != n) 367 printf(FSTR"\n", FSTRARG(p)); 368} 369 370/* print the date of easter sunday */ 371void 372printeaster(int y, int julian, int orthodox) 373{ 374 date dt; 375 struct tm tm; 376 char buf[80]; 377 378 /* force orthodox easter for years before 1583 */ 379 if (y < 1583) 380 orthodox = 1; 381 382 if (orthodox) 383 if (julian) 384 easteroj(y, &dt); 385 else 386 easterog(y, &dt); 387 else 388 easterg(y, &dt); 389 390 memset(&tm, 0, sizeof(tm)); 391 tm.tm_year = dt.y - 1900; 392 tm.tm_mon = dt.m - 1; 393 tm.tm_mday = dt.d; 394 strftime(buf, sizeof(buf), efmt, &tm); 395 printf("%s\n", buf); 396} 397 398void 399printmonth(int y, int m, int jd_flag) 400{ 401 struct monthlines month; 402 struct weekdays wds; 403 int i; 404 405 mkmonth(y, m - 1, jd_flag, &month); 406 mkweekdays(&wds); 407 printf(" %s %d\n", month.name, y); 408 for (i = 0; i != 7; i++) 409 printf("%.2s%s\n", wds.names[i], month.lines[i]); 410 if (flag_weeks) 411 printf(" %s\n", month.weeks); 412} 413 414void 415printmonthb(int y, int m, int jd_flag) 416{ 417 struct monthlines month; 418 struct weekdays wds; 419 char s[MAX_WIDTH], t[MAX_WIDTH]; 420 int i; 421 int mw; 422 423 mkmonthb(y, m - 1, jd_flag, &month); 424 mkweekdays(&wds); 425 426 mw = jd_flag ? MONTH_WIDTH_B_J : MONTH_WIDTH_B; 427 428 sprintf(s, "%s %d", month.name, y); 429 printf("%s\n", center(t, s, mw)); 430 431 if (jd_flag) 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 else 436 printf("%s%s%s%s%s%s%.2s\n", wds.names[6], wds.names[0], 437 wds.names[1], wds.names[2], wds.names[3], 438 wds.names[4], wds.names[5]); 439 440 for (i = 0; i != 6; i++) 441 printf("%s\n", month.lines[i]+1); 442} 443 444void 445printyear(int y, int jd_flag) 446{ 447 struct monthlines year[12]; 448 struct weekdays wds; 449 char s[80], t[80]; 450 int i, j; 451 int mpl; 452 int mw; 453 454 for (i = 0; i != 12; i++) 455 mkmonth(y, i, jd_flag, year + i); 456 mkweekdays(&wds); 457 mpl = jd_flag ? 3 : 4; 458 mw = jd_flag ? MONTH_WIDTH_J : MONTH_WIDTH; 459 460 sprintf(s, "%d", y); 461 printf("%s\n", center(t, s, mpl * mw)); 462 463 for (j = 0; j != 12; j += mpl) { 464 printf(" %-*s%-*s", 465 mw, year[j].name, 466 mw, year[j + 1].name); 467 if (mpl == 3) 468 printf("%s\n", year[j + 2].name); 469 else 470 printf("%-*s%s\n", 471 mw, year[j + 2].name, 472 year[j + 3].name); 473 for (i = 0; i != 7; i++) { 474 printf("%.2s%-*s%-*s", 475 wds.names[i], 476 mw, year[j].lines[i], 477 mw, year[j + 1].lines[i]); 478 if (mpl == 3) 479 printf("%s\n", year[j + 2].lines[i]); 480 else 481 printf("%-*s%s\n", 482 mw, year[j + 2].lines[i], 483 year[j + 3].lines[i]); 484 } 485 if (flag_weeks) 486 if (mpl == 3) 487 printf(" %-*s%-*s%-s\n", 488 mw, year[j].weeks, 489 mw, year[j + 1].weeks, 490 year[j + 2].weeks); 491 else 492 printf(" %-*s%-*s%-*s%-s\n", 493 mw, year[j].weeks, 494 mw, year[j + 1].weeks, 495 mw, year[j + 2].weeks, 496 year[j + 3].weeks); 497 } 498} 499 500void 501printyearb(int y, int jd_flag) 502{ 503 struct monthlines year[12]; 504 struct weekdays wds; 505 char s[80], t[80]; 506 int i, j; 507 int mpl; 508 int mw; 509 510 for (i = 0; i != 12; i++) 511 mkmonthb(y, i, jd_flag, year + i); 512 mkweekdays(&wds); 513 mpl = jd_flag ? 2 : 3; 514 mw = jd_flag ? MONTH_WIDTH_B_J : MONTH_WIDTH_B; 515 516 sprintf(s, "%d", y); 517 printf("%s\n\n", center(t, s, mw * mpl + mpl)); 518 519 for (j = 0; j != 12; j += mpl) { 520 printf("%-*s ", mw, center(s, year[j].name, mw)); 521 if (mpl == 2) 522 printf("%s\n", center(s, year[j + 1].name, mw)); 523 else 524 printf("%-*s %s\n", mw, 525 center(s, year[j + 1].name, mw), 526 center(t, year[j + 2].name, mw)); 527 528 if (mpl == 2) 529 printf(" %s %s %s %s %s %s %s " 530 " %s %s %s %s %s %s %.2s\n", 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 wds.names[6], wds.names[0], wds.names[1], 535 wds.names[2], wds.names[3], wds.names[4], 536 wds.names[5]); 537 else 538 printf("%s%s%s%s%s%s%s " 539 "%s%s%s%s%s%s%s " 540 "%s%s%s%s%s%s%.2s\n", 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 wds.names[6], wds.names[0], wds.names[1], 548 wds.names[2], wds.names[3], wds.names[4], 549 wds.names[5]); 550 for (i = 0; i != 6; i++) { 551 if (mpl == 2) 552 printf("%-*s %s\n", 553 mw, year[j].lines[i]+1, 554 year[j + 1].lines[i]+1); 555 else 556 printf("%-*s %-*s %s\n", 557 mw, year[j].lines[i]+1, 558 mw, year[j + 1].lines[i]+1, 559 year[j + 2].lines[i]+1); 560 561 } 562 } 563} 564 565void 566mkmonth(int y, int m, int jd_flag, struct monthlines *mlines) 567{ 568 569 struct tm tm; /* for strftime printing local names of 570 * months */ 571 date dt; /* handy date */ 572 int dw; /* width of numbers */ 573 int first; /* first day of month */ 574 int firstm; /* first day of first week of month */ 575 int i, j, k; /* just indices */ 576 int last; /* the first day of next month */ 577 int jan1 = 0; /* the first day of this year */ 578 char *ds; /* pointer to day strings (daystr or 579 * jdaystr) */ 580 581 /* Set name of month. */ 582 memset(&tm, 0, sizeof(tm)); 583 tm.tm_mon = m; 584 strftime(mlines->name, sizeof(mlines->name), "%B", &tm); 585 586 /* 587 * Set first and last to the day number of the first day of this 588 * month and the first day of next month respectively. Set jan1 to 589 * the day number of the first day of this year. 590 */ 591 first = firstday(y, m + 1); 592 if (m == 11) 593 last = firstday(y + 1, 1); 594 else 595 last = firstday(y, m + 2); 596 597 if (jd_flag) 598 jan1 = firstday(y, 1); 599 600 /* 601 * Set firstm to the day number of monday of the first week of 602 * this month. (This might be in the last month) 603 */ 604 firstm = first - weekday(first); 605 606 /* Set ds (daystring) and dw (daywidth) according to the jd_flag */ 607 if (jd_flag) { 608 ds = jdaystr; 609 dw = 4; 610 } else { 611 ds = daystr; 612 dw = 3; 613 } 614 615 /* 616 * Fill the lines with day of month or day of year (julian day) 617 * line index: i, each line is one weekday. column index: j, each 618 * column is one day number. print column index: k. 619 */ 620 for (i = 0; i != 7; i++) { 621 for (j = firstm + i, k = 0; j < last; j += 7, k += dw) 622 if (j >= first) { 623 if (jd_flag) 624 dt.d = j - jan1 + 1; 625 else 626 sdate(j, &dt); 627 memcpy(mlines->lines[i] + k, 628 ds + dt.d * dw, dw); 629 } else 630 memcpy(mlines->lines[i] + k, " ", dw); 631 mlines->lines[i][k] = '\0'; 632 633 } 634 635 /* fill the weeknumbers */ 636 if (flag_weeks) { 637 for (j = firstm, k = 0; j < last; k += dw, j += 7) 638 if (j <= nswitch) 639 memset(mlines->weeks + k, ' ', dw); 640 else 641 memcpy(mlines->weeks + k, 642 ds + week(j, &i)*dw, dw); 643 mlines->weeks[k] = '\0'; 644 } 645} 646 647void 648mkmonthb(int y, int m, int jd_flag, struct monthlines *mlines) 649{ 650 651 struct tm tm; /* for strftime printing local names of 652 * months */ 653 date dt; /* handy date */ 654 int dw; /* width of numbers */ 655 int first; /* first day of month */ 656 int firsts; /* sunday of first week of month */ 657 int i, j, k; /* just indices */ 658 int jan1 = 0; /* the first day of this year */ 659 int last; /* the first day of next month */ 660 char *ds; /* pointer to day strings (daystr or 661 * jdaystr) */ 662 663 /* Set ds (daystring) and dw (daywidth) according to the jd_flag */ 664 if (jd_flag) { 665 ds = jdaystr; 666 dw = 4; 667 } else { 668 ds = daystr; 669 dw = 3; 670 } 671 672 /* Set name of month centered */ 673 memset(&tm, 0, sizeof(tm)); 674 tm.tm_mon = m; 675 strftime(mlines->name, sizeof(mlines->name), "%B", &tm); 676 677 /* 678 * Set first and last to the day number of the first day of this 679 * month and the first day of next month respectively. Set jan1 to 680 * the day number of Jan 1st of this year. 681 */ 682 dt.y = y; 683 dt.m = m + 1; 684 dt.d = 1; 685 first = sndaysb(&dt); 686 if (m == 11) { 687 dt.y = y + 1; 688 dt.m = 1; 689 dt.d = 1; 690 } else { 691 dt.y = y; 692 dt.m = m + 2; 693 dt.d = 1; 694 } 695 last = sndaysb(&dt); 696 697 if (jd_flag) { 698 dt.y = y; 699 dt.m = 1; 700 dt.d = 1; 701 jan1 = sndaysb(&dt); 702 } 703 704 /* 705 * Set firsts to the day number of sunday of the first week of 706 * this month. (This might be in the last month) 707 */ 708 firsts = first - (weekday(first)+1) % 7; 709 710 /* 711 * Fill the lines with day of month or day of year (Julian day) 712 * line index: i, each line is one week. column index: j, each 713 * column is one day number. print column index: k. 714 */ 715 for (i = 0; i != 6; i++) { 716 for (j = firsts + 7 * i, k = 0; j < last && k != dw * 7; 717 j++, k += dw) 718 if (j >= first) { 719 if (jd_flag) 720 dt.d = j - jan1 + 1; 721 else 722 sdateb(j, &dt); 723 memcpy(mlines->lines[i] + k, 724 ds + dt.d * dw, dw); 725 } else 726 memcpy(mlines->lines[i] + k, " ", dw); 727 if (k == 0) 728 mlines->lines[i][1] = '\0'; 729 else 730 mlines->lines[i][k] = '\0'; 731 } 732} 733 734/* Put the local names of weekdays into the wds */ 735void 736mkweekdays(struct weekdays *wds) 737{ 738 int i; 739 struct tm tm; 740 741 memset(&tm, 0, sizeof(tm)); 742 743 for (i = 0; i != 7; i++) { 744 tm.tm_wday = (i+1) % 7; 745 strftime(wds->names[i], 4, "%a", &tm); 746 wds->names[i][2] = ' '; 747 } 748} 749 750/* 751 * Compute the day number of the first 752 * existing date after the first day in month. 753 * (the first day in month and even the month might not exist!) 754 */ 755int 756firstday(int y, int m) 757{ 758 date dt; 759 int nd; 760 761 dt.y = y; 762 dt.m = m; 763 dt.d = 1; 764 nd = sndays(&dt); 765 for (;;) { 766 sdate(nd, &dt); 767 if ((dt.m >= m && dt.y == y) || dt.y > y) 768 return (nd); 769 else 770 nd++; 771 } 772 /* NEVER REACHED */ 773} 774 775/* 776 * Compute the number of days from date, obey the local switch from 777 * Julian to Gregorian if specified by the user. 778 */ 779int 780sndays(struct date *d) 781{ 782 783 if (nswitch != 0) 784 if (nswitch < ndaysj(d)) 785 return (ndaysg(d)); 786 else 787 return (ndaysj(d)); 788 else 789 return ndaysg(d); 790} 791 792/* 793 * Compute the number of days from date, obey the switch from 794 * Julian to Gregorian as used by UK and her colonies. 795 */ 796int 797sndaysb(struct date *d) 798{ 799 800 if (nswitchb < ndaysj(d)) 801 return (ndaysg(d)); 802 else 803 return (ndaysj(d)); 804} 805 806/* Inverse of sndays */ 807struct date * 808sdate(int nd, struct date *d) 809{ 810 811 if (nswitch < nd) 812 return (gdate(nd, d)); 813 else 814 return (jdate(nd, d)); 815} 816 817/* Inverse of sndaysb */ 818struct date * 819sdateb(int nd, struct date *d) 820{ 821 822 if (nswitchb < nd) 823 return (gdate(nd, d)); 824 else 825 return (jdate(nd, d)); 826} 827 828/* Center string t in string s of length w by putting enough leading blanks */ 829char * 830center(char *s, char *t, int w) 831{ 832 char blanks[80]; 833 834 memset(blanks, ' ', sizeof(blanks)); 835 sprintf(s, "%.*s%s", (int)(w - strlen(t)) / 2, blanks, t); 836 return (s); 837} 838