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freebsd-nq/usr.bin/ncal/ncal.c
Wolfgang Helbig cf5f6adf44 Due to the switch form Julian to Gregorian calender, 
even a whole month might be missing.
This caused a bug for the LN -calender, whose switch was
on Dec 12, 9999.
1999-03-27 21:08:13 +00:00

838 lines
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/*-
* Copyright (c) 1997 Wolfgang Helbig
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char rcsid[] =
"$Id: ncal.c,v 1.6 1998/01/15 10:23:34 helbig Exp $";
#endif /* not lint */
#include <calendar.h>
#include <err.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <time.h>
#include <unistd.h>
/* Width of one month with backward compatibility */
#define MONTH_WIDTH_B_J 27
#define MONTH_WIDTH_B 20
#define MONTH_WIDTH_J 24
#define MONTH_WIDTH 18
#define MAX_WIDTH 28
typedef struct date date;
struct monthlines {
char name[MAX_WIDTH + 1];
char lines[7][MAX_WIDTH + 1];
char weeks[MAX_WIDTH + 1];
};
struct weekdays {
char names[7][4];
};
/* The switches from Julian to Gregorian in some countries */
static struct djswitch {
char *cc; /* Country code according to ISO 3166 */
char *nm; /* Name of country */
date dt; /* Last day of Julian calendar */
char *efmt; /* strftime format for printing date of easter */
} switches[] = {
{"AL", "Albania", {1912, 11, 30}, "%e %B %Y"},
{"AT", "Austria", {1583, 10, 5}, "%e. %B %Y"},
{"AU", "Australia", {1752, 9, 2}, "%B %e, %Y"},
{"BE", "Belgium", {1582, 12, 14}, "%B %e, %Y"},
{"BG", "Bulgaria", {1916, 3, 18}, "%e %B %Y"},
{"CA", "Canada", {1752, 9, 2}, "%B %e, %Y"},
{"CH", "Switzerland", {1655, 2, 28}, "%e. %B %Y"},
{"CN", "China", {1911, 12, 18}, "%e %B %Y"},
{"CZ", "Czech Republic",{1584, 1, 6}, "%e %B %Y"},
{"DE", "Germany", {1700, 2, 18}, "%e. %B %Y"},
{"DK", "Denmark", {1700, 2, 18}, "%e. %B %Y"},
{"ES", "Spain", {1582, 10, 4}, "%e de %B de %Y"},
{"FI", "Finland", {1753, 2, 17}, "%e %B %Y"},
{"FR", "France", {1582, 12, 9}, "%e. %B %Y"},
{"GB", "United Kingdom",{1752, 9, 2}, "%e %B %Y"},
{"GR", "Greece", {1924, 3, 9}, "%e %B %Y"},
{"HU", "Hungary", {1587, 10, 21}, "%e %B %Y"},
{"IS", "Iceland", {1700, 11, 16}, "%e %B %Y"},
{"IT", "Italy", {1582, 10, 4}, "%e %B %Y"},
{"JP", "Japan", {1918, 12, 18}, "%Y\x94N %B%e"},
{"LI", "Lithuania", {1918, 2, 1}, "%e %B %Y"},
{"LN", "Latin", {9999, 05, 31}, "%e %B %Y"},
{"LU", "Luxembourg", {1582, 12, 14}, "%e %B %Y"},
{"LV", "Latvia", {1918, 2, 1}, "%e %B %Y"},
{"NL", "Netherlands", {1582, 12, 14}, "%e %B %Y"},
{"NO", "Norway", {1700, 2, 18}, "%e %B %Y"},
{"PL", "Poland", {1582, 10, 4}, "%e %B %Y"},
{"PT", "Portugal", {1582, 10, 4}, "%e %B %Y"},
{"RO", "Romania", {1919, 3, 31}, "%e %B %Y"},
{"RU", "Russia", {1918, 1, 31}, "%e %B %Y"},
{"SI", "Slovenia", {1919, 3, 4}, "%e %B %Y"},
{"SU", "USSR", {1920, 3, 4}, "%e %B %Y"},
{"SW", "Sweden", {1753, 2, 17}, "%e %B %Y"},
{"TR", "Turkey", {1926, 12, 18}, "%e %B %Y"},
{"US", "United States", {1752, 9, 2}, "%B %e, %Y"},
{"YU", "Yugoslavia", {1919, 3, 4}, "%e %B %Y"}
};
struct djswitch *dftswitch =
switches + sizeof(switches) / sizeof(struct djswitch) - 2;
/* default switch (should be "US") */
/* Table used to print day of month and week numbers */
char daystr[] = " 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15"
" 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31"
" 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47"
" 48 49 50 51 52 53";
/* Table used to print day of year and week numbers */
char jdaystr[] = " 1 2 3 4 5 6 7 8 9"
" 10 11 12 13 14 15 16 17 18 19"
" 20 21 22 23 24 25 26 27 28 29"
" 30 31 32 33 34 35 36 37 38 39"
" 40 41 42 43 44 45 46 47 48 49"
" 50 51 52 53 54 55 56 57 58 59"
" 60 61 62 63 64 65 66 67 68 69"
" 70 71 72 73 74 75 76 77 78 79"
" 80 81 82 83 84 85 86 87 88 89"
" 90 91 92 93 94 95 96 97 98 99"
" 100 101 102 103 104 105 106 107 108 109"
" 110 111 112 113 114 115 116 117 118 119"
" 120 121 122 123 124 125 126 127 128 129"
" 130 131 132 133 134 135 136 137 138 139"
" 140 141 142 143 144 145 146 147 148 149"
" 150 151 152 153 154 155 156 157 158 159"
" 160 161 162 163 164 165 166 167 168 169"
" 170 171 172 173 174 175 176 177 178 179"
" 180 181 182 183 184 185 186 187 188 189"
" 190 191 192 193 194 195 196 197 198 199"
" 200 201 202 203 204 205 206 207 208 209"
" 210 211 212 213 214 215 216 217 218 219"
" 220 221 222 223 224 225 226 227 228 229"
" 230 231 232 233 234 235 236 237 238 239"
" 240 241 242 243 244 245 246 247 248 249"
" 250 251 252 253 254 255 256 257 258 259"
" 260 261 262 263 264 265 266 267 268 269"
" 270 271 272 273 274 275 276 277 278 279"
" 280 281 282 283 284 285 286 287 288 289"
" 290 291 292 293 294 295 296 297 298 299"
" 300 301 302 303 304 305 306 307 308 309"
" 310 311 312 313 314 315 316 317 318 319"
" 320 321 322 323 324 325 326 327 328 329"
" 330 331 332 333 334 335 336 337 338 339"
" 340 341 342 343 344 345 346 347 348 349"
" 350 351 352 353 354 355 356 357 358 359"
" 360 361 362 363 364 365 366";
int flag_weeks; /* user wants number of week */
int nswitch; /* user defined switch date */
int nswitchb; /* switch date for backward compatibility */
char *efmt; /* strftime format string for printeaster() */
char *center(char *s, char *t, int w);
void mkmonth(int year, int month, int jd_flag, struct monthlines * monthl);
void mkmonthb(int year, int month, int jd_flag, struct monthlines * monthl);
void mkweekdays(struct weekdays * wds);
void printcc(void);
void printeaster(int year, int julian, int orthodox);
void printmonth(int year, int month, int jd_flag);
void printmonthb(int year, int month, int jd_flag);
void printyear(int year, int jd_flag);
void printyearb(int year, int jd_flag);
int firstday(int y, int m);
date *sdate(int ndays, struct date * d);
date *sdateb(int ndays, struct date * d);
int sndays(struct date * d);
int sndaysb(struct date * d);
static void usage(void);
int weekdayb(int nd);
int
main(int argc, char *argv[])
{
struct djswitch *p, *q; /* to search user defined switch date */
date never = {10000, 1, 1}; /* outside valid range of dates */
date ukswitch = {1752, 9, 2};/* switch date for Great Britain */
int ch; /* holds the option character */
int m = 0; /* month */
int y = 0; /* year */
int flag_backward = 0; /* user called cal--backward compat. */
int flag_hole_year = 0; /* user wants the whole year */
int flag_julian_cal = 0; /* user wants Julian Calendar */
int flag_julian_day = 0; /* user wants the Julian day
* numbers */
int flag_orthodox = 0; /* use wants Orthodox easter */
int flag_easter = 0; /* use wants easter date */
char *cp; /* character pointer */
char *locale; /* locale to get country code */
/*
* Use locale to determine the country code,
* and use the country code to determine the default
* switchdate and date format from the switches table.
*/
if ((locale = setlocale(LC_TIME, "")) == NULL)
warn("setlocale");
if (locale == NULL || locale == "C")
locale = "_US";
q = switches + sizeof(switches) / sizeof(struct djswitch);
for (p = switches; p != q; p++)
if ((cp = strstr(locale, p->cc)) != NULL && *(cp - 1) == '_')
break;
if (p == q) {
nswitch = ndaysj(&dftswitch->dt);
efmt = dftswitch->efmt;
} else {
nswitch = ndaysj(&p->dt);
efmt = p->efmt;
dftswitch = p;
}
/*
* Get the filename portion of argv[0] and set flag_backward if
* this program is called "cal".
*/
for (cp = argv[0]; *cp; cp++)
;
while (cp >= argv[0] && *cp != '/')
cp--;
if (strcmp("cal", ++cp) == 0)
flag_backward = 1;
/* Set the switch date to United Kingdom if backwards compatible */
if (flag_backward)
nswitchb = ndaysj(&ukswitch);
while ((ch = getopt(argc, argv, "Jejops:wy")) != -1)
switch (ch) {
case 'J':
if (flag_backward)
usage();
nswitch = ndaysj(&never);
flag_julian_cal = 1;
break;
case 'e':
if (flag_backward)
usage();
flag_easter = 1;
break;
case 'j':
flag_julian_day = 1;
break;
case 'o':
if (flag_backward)
usage();
flag_orthodox = 1;
flag_easter = 1;
break;
case 'p':
if (flag_backward)
usage();
printcc();
return (0);
break;
case 's':
if (flag_backward)
usage();
q = switches +
sizeof(switches) / sizeof(struct djswitch);
for (p = switches;
p != q && strcmp(p->cc, optarg) != 0; p++)
;
if (p == q)
errx(EX_USAGE,
"%s: invalid country code", optarg);
nswitch = ndaysj(&(p->dt));
break;
case 'w':
if (flag_backward)
usage();
flag_weeks = 1;
break;
case 'y':
flag_hole_year = 1;
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (argc == 0) {
time_t t;
struct tm *tm;
t = time(NULL);
tm = localtime(&t);
y = tm->tm_year + 1900;
m = tm->tm_mon + 1;
}
switch (argc) {
case 2:
if (flag_easter)
usage();
m = atoi(*argv++);
if (m < 1 || m > 12)
errx(EX_USAGE, "month %d not in range 1..12", m);
/* FALLTHROUGH */
case 1:
y = atoi(*argv++);
if (y < 1 || y > 9999)
errx(EX_USAGE, "year %d not in range 1..9999", y);
break;
case 0:
break;
default:
usage();
}
if (flag_easter)
printeaster(y, flag_julian_cal, flag_orthodox);
else if (argc == 1 || flag_hole_year)
if (flag_backward)
printyearb(y, flag_julian_day);
else
printyear(y, flag_julian_day);
else
if (flag_backward)
printmonthb(y, m, flag_julian_day);
else
printmonth(y, m, flag_julian_day);
return (0);
}
static void
usage(void)
{
fprintf(stderr, "%s\n%s\n%s\n",
"usage: cal [-jy] [[month] year]",
" ncal [-Jjpwy] [-s country_code] [[month] year]",
" ncal [-Jeo] [year]");
exit(EX_USAGE);
}
/* print the assumed switches for all countries */
void
printcc(void)
{
struct djswitch *p;
int n; /* number of lines to print */
int m; /* offset from left to right table entry on the same line */
#define FSTR "%c%s %-15s%4d-%02d-%02d"
#define DFLT(p) ((p) == dftswitch ? '*' : ' ')
#define FSTRARG(p) DFLT(p), (p)->cc, (p)->nm, (p)->dt.y, (p)->dt.m, (p)->dt.d
n = sizeof(switches) / sizeof(struct djswitch);
m = (n + 1) / 2;
n /= 2;
for (p = switches; p != switches + n; p++)
printf(FSTR" "FSTR"\n", FSTRARG(p), FSTRARG(p+m));
if (m != n)
printf(FSTR"\n", FSTRARG(p));
}
/* print the date of easter sunday */
void
printeaster(int y, int julian, int orthodox)
{
date dt;
struct tm tm;
char buf[80];
/* force orthodox easter for years before 1583 */
if (y < 1583)
orthodox = 1;
if (orthodox)
if (julian)
easteroj(y, &dt);
else
easterog(y, &dt);
else
easterg(y, &dt);
memset(&tm, 0, sizeof(tm));
tm.tm_year = dt.y - 1900;
tm.tm_mon = dt.m - 1;
tm.tm_mday = dt.d;
strftime(buf, sizeof(buf), efmt, &tm);
printf("%s\n", buf);
}
void
printmonth(int y, int m, int jd_flag)
{
struct monthlines month;
struct weekdays wds;
int i;
mkmonth(y, m - 1, jd_flag, &month);
mkweekdays(&wds);
printf(" %s %d\n", month.name, y);
for (i = 0; i != 7; i++)
printf("%.2s%s\n", wds.names[i], month.lines[i]);
if (flag_weeks)
printf(" %s\n", month.weeks);
}
void
printmonthb(int y, int m, int jd_flag)
{
struct monthlines month;
struct weekdays wds;
char s[MAX_WIDTH], t[MAX_WIDTH];
int i;
int mw;
mkmonthb(y, m - 1, jd_flag, &month);
mkweekdays(&wds);
mw = jd_flag ? MONTH_WIDTH_B_J : MONTH_WIDTH_B;
sprintf(s, "%s %d", month.name, y);
printf("%s\n", center(t, s, mw));
if (jd_flag)
printf(" %s %s %s %s %s %s %.2s\n", wds.names[6], wds.names[0],
wds.names[1], wds.names[2], wds.names[3],
wds.names[4], wds.names[5]);
else
printf("%s%s%s%s%s%s%.2s\n", wds.names[6], wds.names[0],
wds.names[1], wds.names[2], wds.names[3],
wds.names[4], wds.names[5]);
for (i = 0; i != 6; i++)
printf("%s\n", month.lines[i]+1);
}
void
printyear(int y, int jd_flag)
{
struct monthlines year[12];
struct weekdays wds;
char s[80], t[80];
int i, j;
int mpl;
int mw;
for (i = 0; i != 12; i++)
mkmonth(y, i, jd_flag, year + i);
mkweekdays(&wds);
mpl = jd_flag ? 3 : 4;
mw = jd_flag ? MONTH_WIDTH_J : MONTH_WIDTH;
sprintf(s, "%d", y);
printf("%s\n", center(t, s, mpl * mw));
for (j = 0; j != 12; j += mpl) {
printf(" %-*s%-*s",
mw, year[j].name,
mw, year[j + 1].name);
if (mpl == 3)
printf("%s\n", year[j + 2].name);
else
printf("%-*s%s\n",
mw, year[j + 2].name,
year[j + 3].name);
for (i = 0; i != 7; i++) {
printf("%.2s%-*s%-*s",
wds.names[i],
mw, year[j].lines[i],
mw, year[j + 1].lines[i]);
if (mpl == 3)
printf("%s\n", year[j + 2].lines[i]);
else
printf("%-*s%s\n",
mw, year[j + 2].lines[i],
year[j + 3].lines[i]);
}
if (flag_weeks)
if (mpl == 3)
printf(" %-*s%-*s%-s\n",
mw, year[j].weeks,
mw, year[j + 1].weeks,
year[j + 2].weeks);
else
printf(" %-*s%-*s%-*s%-s\n",
mw, year[j].weeks,
mw, year[j + 1].weeks,
mw, year[j + 2].weeks,
year[j + 3].weeks);
}
}
void
printyearb(int y, int jd_flag)
{
struct monthlines year[12];
struct weekdays wds;
char s[80], t[80];
int i, j;
int mpl;
int mw;
for (i = 0; i != 12; i++)
mkmonthb(y, i, jd_flag, year + i);
mkweekdays(&wds);
mpl = jd_flag ? 2 : 3;
mw = jd_flag ? MONTH_WIDTH_B_J : MONTH_WIDTH_B;
sprintf(s, "%d", y);
printf("%s\n\n", center(t, s, mw * mpl + mpl));
for (j = 0; j != 12; j += mpl) {
printf("%-*s ", mw, center(s, year[j].name, mw));
if (mpl == 2)
printf("%s\n", center(s, year[j + 1].name, mw));
else
printf("%-*s %s\n", mw,
center(s, year[j + 1].name, mw),
center(t, year[j + 2].name, mw));
if (mpl == 2)
printf(" %s %s %s %s %s %s %s "
" %s %s %s %s %s %s %.2s\n",
wds.names[6], wds.names[0], wds.names[1],
wds.names[2], wds.names[3], wds.names[4],
wds.names[5],
wds.names[6], wds.names[0], wds.names[1],
wds.names[2], wds.names[3], wds.names[4],
wds.names[5]);
else
printf("%s%s%s%s%s%s%s "
"%s%s%s%s%s%s%s "
"%s%s%s%s%s%s%.2s\n",
wds.names[6], wds.names[0], wds.names[1],
wds.names[2], wds.names[3], wds.names[4],
wds.names[5],
wds.names[6], wds.names[0], wds.names[1],
wds.names[2], wds.names[3], wds.names[4],
wds.names[5],
wds.names[6], wds.names[0], wds.names[1],
wds.names[2], wds.names[3], wds.names[4],
wds.names[5]);
for (i = 0; i != 6; i++) {
if (mpl == 2)
printf("%-*s %s\n",
mw, year[j].lines[i]+1,
year[j + 1].lines[i]+1);
else
printf("%-*s %-*s %s\n",
mw, year[j].lines[i]+1,
mw, year[j + 1].lines[i]+1,
year[j + 2].lines[i]+1);
}
}
}
void
mkmonth(int y, int m, int jd_flag, struct monthlines *mlines)
{
struct tm tm; /* for strftime printing local names of
* months */
date dt; /* handy date */
int dw; /* width of numbers */
int first; /* first day of month */
int firstm; /* first day of first week of month */
int i, j, k; /* just indices */
int last; /* the first day of next month */
int jan1 = 0; /* the first day of this year */
char *ds; /* pointer to day strings (daystr or
* jdaystr) */
/* Set name of month. */
memset(&tm, 0, sizeof(tm));
tm.tm_mon = m;
strftime(mlines->name, sizeof(mlines->name), "%B", &tm);
/*
* Set first and last to the day number of the first day of this
* month and the first day of next month respectively. Set jan1 to
* the day number of the first day of this year.
*/
first = firstday(y, m + 1);
if (m == 11)
last = firstday(y + 1, 1);
else
last = firstday(y, m + 2);
if (jd_flag)
jan1 = firstday(y, 1);
/*
* Set firstm to the day number of monday of the first week of
* this month. (This might be in the last month)
*/
firstm = first - weekday(first);
/* Set ds (daystring) and dw (daywidth) according to the jd_flag */
if (jd_flag) {
ds = jdaystr;
dw = 4;
} else {
ds = daystr;
dw = 3;
}
/*
* Fill the lines with day of month or day of year (julian day)
* line index: i, each line is one weekday. column index: j, each
* column is one day number. print column index: k.
*/
for (i = 0; i != 7; i++) {
for (j = firstm + i, k = 0; j < last; j += 7, k += dw)
if (j >= first) {
if (jd_flag)
dt.d = j - jan1 + 1;
else
sdate(j, &dt);
memcpy(mlines->lines[i] + k,
ds + dt.d * dw, dw);
} else
memcpy(mlines->lines[i] + k, " ", dw);
mlines->lines[i][k] = '\0';
}
/* fill the weeknumbers */
if (flag_weeks) {
for (j = firstm, k = 0; j < last; k += dw, j += 7)
if (j <= nswitch)
memset(mlines->weeks + k, ' ', dw);
else
memcpy(mlines->weeks + k,
ds + week(j, &i)*dw, dw);
mlines->weeks[k] = '\0';
}
}
void
mkmonthb(int y, int m, int jd_flag, struct monthlines *mlines)
{
struct tm tm; /* for strftime printing local names of
* months */
date dt; /* handy date */
int dw; /* width of numbers */
int first; /* first day of month */
int firsts; /* sunday of first week of month */
int i, j, k; /* just indices */
int jan1 = 0; /* the first day of this year */
int last; /* the first day of next month */
char *ds; /* pointer to day strings (daystr or
* jdaystr) */
/* Set ds (daystring) and dw (daywidth) according to the jd_flag */
if (jd_flag) {
ds = jdaystr;
dw = 4;
} else {
ds = daystr;
dw = 3;
}
/* Set name of month centered */
memset(&tm, 0, sizeof(tm));
tm.tm_mon = m;
strftime(mlines->name, sizeof(mlines->name), "%B", &tm);
/*
* Set first and last to the day number of the first day of this
* month and the first day of next month respectively. Set jan1 to
* the day number of Jan 1st of this year.
*/
dt.y = y;
dt.m = m + 1;
dt.d = 1;
first = sndaysb(&dt);
if (m == 11) {
dt.y = y + 1;
dt.m = 1;
dt.d = 1;
} else {
dt.y = y;
dt.m = m + 2;
dt.d = 1;
}
last = sndaysb(&dt);
if (jd_flag) {
dt.y = y;
dt.m = 1;
dt.d = 1;
jan1 = sndaysb(&dt);
}
/*
* Set firsts to the day number of sunday of the first week of
* this month. (This might be in the last month)
*/
firsts = first - (weekday(first)+1) % 7;
/*
* Fill the lines with day of month or day of year (Julian day)
* line index: i, each line is one week. column index: j, each
* column is one day number. print column index: k.
*/
for (i = 0; i != 6; i++) {
for (j = firsts + 7 * i, k = 0; j < last && k != dw * 7;
j++, k += dw)
if (j >= first) {
if (jd_flag)
dt.d = j - jan1 + 1;
else
sdateb(j, &dt);
memcpy(mlines->lines[i] + k,
ds + dt.d * dw, dw);
} else
memcpy(mlines->lines[i] + k, " ", dw);
if (k == 0)
mlines->lines[i][1] = '\0';
else
mlines->lines[i][k] = '\0';
}
}
/* Put the local names of weekdays into the wds */
void
mkweekdays(struct weekdays *wds)
{
int i;
struct tm tm;
memset(&tm, 0, sizeof(tm));
for (i = 0; i != 7; i++) {
tm.tm_wday = (i+1) % 7;
strftime(wds->names[i], 4, "%a", &tm);
wds->names[i][2] = ' ';
}
}
/*
* Compute the day number of the first
* existing date after the first day in month.
* (the first day in month and even the month might not exist!)
*/
int
firstday(int y, int m)
{
date dt;
int nd;
dt.y = y;
dt.m = m;
dt.d = 1;
nd = sndays(&dt);
for (;;) {
sdate(nd, &dt);
if ((dt.m >= m && dt.y == y) || dt.y > y)
return (nd);
else
nd++;
}
/* NEVER REACHED */
}
/*
* Compute the number of days from date, obey the local switch from
* Julian to Gregorian if specified by the user.
*/
int
sndays(struct date *d)
{
if (nswitch != 0)
if (nswitch < ndaysj(d))
return (ndaysg(d));
else
return (ndaysj(d));
else
return ndaysg(d);
}
/*
* Compute the number of days from date, obey the switch from
* Julian to Gregorian as used by UK and her colonies.
*/
int
sndaysb(struct date *d)
{
if (nswitchb < ndaysj(d))
return (ndaysg(d));
else
return (ndaysj(d));
}
/* Inverse of sndays */
struct date *
sdate(int nd, struct date *d)
{
if (nswitch < nd)
return (gdate(nd, d));
else
return (jdate(nd, d));
}
/* Inverse of sndaysb */
struct date *
sdateb(int nd, struct date *d)
{
if (nswitchb < nd)
return (gdate(nd, d));
else
return (jdate(nd, d));
}
/* Center string t in string s of length w by putting enough leading blanks */
char *
center(char *s, char *t, int w)
{
char blanks[80];
memset(blanks, ' ', sizeof(blanks));
sprintf(s, "%.*s%s", (int)(w - strlen(t)) / 2, blanks, t);
return (s);
}
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