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freebsd-skq/usr.bin/ncal/ncal.c
wollman 3dff28c944 Implement a new feature for the "-m" option: if the month number is 
followed by 'f' or 'p', use the following or preceding month of that
number, respectively.  Document this.  Also includes other minor
grammatical and punctuation fixes to the manual page (capitalize
Easter, etc.).

MFC after:	1 month
2008-12-22 21:22:42 +00:00

893 lines
22 KiB
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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[] =
"$FreeBSD$";
#endif /* not lint */
#include <calendar.h>
#include <ctype.h>
#include <err.h>
#include <langinfo.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 {
const char *cc; /* Country code according to ISO 3166 */
const char *nm; /* Name of country */
date dt; /* Last day of Julian calendar */
} switches[] = {
{"AL", "Albania", {1912, 11, 30}},
{"AT", "Austria", {1583, 10, 5}},
{"AU", "Australia", {1752, 9, 2}},
{"BE", "Belgium", {1582, 12, 14}},
{"BG", "Bulgaria", {1916, 3, 18}},
{"CA", "Canada", {1752, 9, 2}},
{"CH", "Switzerland", {1655, 2, 28}},
{"CN", "China", {1911, 12, 18}},
{"CZ", "Czech Republic",{1584, 1, 6}},
{"DE", "Germany", {1700, 2, 18}},
{"DK", "Denmark", {1700, 2, 18}},
{"ES", "Spain", {1582, 10, 4}},
{"FI", "Finland", {1753, 2, 17}},
{"FR", "France", {1582, 12, 9}},
{"GB", "United Kingdom",{1752, 9, 2}},
{"GR", "Greece", {1924, 3, 9}},
{"HU", "Hungary", {1587, 10, 21}},
{"IS", "Iceland", {1700, 11, 16}},
{"IT", "Italy", {1582, 10, 4}},
{"JP", "Japan", {1918, 12, 18}},
{"LI", "Lithuania", {1918, 2, 1}},
{"LN", "Latin", {9999, 05, 31}},
{"LU", "Luxembourg", {1582, 12, 14}},
{"LV", "Latvia", {1918, 2, 1}},
{"NL", "Netherlands", {1582, 12, 14}},
{"NO", "Norway", {1700, 2, 18}},
{"PL", "Poland", {1582, 10, 4}},
{"PT", "Portugal", {1582, 10, 4}},
{"RO", "Romania", {1919, 3, 31}},
{"RU", "Russia", {1918, 1, 31}},
{"SI", "Slovenia", {1919, 3, 4}},
{"SW", "Sweden", {1753, 2, 17}},
{"TR", "Turkey", {1926, 12, 18}},
{"US", "United States", {1752, 9, 2}},
{"YU", "Yugoslavia", {1919, 3, 4}}
};
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 *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);
int parsemonth(const char *s, int *m, int *y);
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 *flag_month = NULL; /* requested month as string */
const 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 (setlocale(LC_ALL, "") == NULL)
warn("setlocale");
locale = setlocale(LC_TIME, NULL);
if (locale == NULL ||
strcmp(locale, "C") == 0 ||
strcmp(locale, "POSIX") == 0 ||
strcmp(locale, "ASCII") == 0 ||
strcmp(locale, "US-ASCII") == 0)
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);
} else {
nswitch = ndaysj(&p->dt);
dftswitch = p;
}
/*
* Get the filename portion of argv[0] and set flag_backward if
* this program is called "cal".
*/
cp = strrchr(argv[0], '/');
cp = (cp == NULL) ? argv[0] : cp + 1;
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, "Jejm:ops: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 'm':
flag_month = optarg;
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;
switch (argc) {
case 2:
if (flag_easter)
usage();
flag_month = *argv++;
/* 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:
{
time_t t;
struct tm *tm;
t = time(NULL);
tm = localtime(&t);
y = tm->tm_year + 1900;
m = tm->tm_mon + 1;
}
break;
default:
usage();
}
if (flag_month != NULL) {
if (parsemonth(flag_month, &m, &y)) {
errx(EX_USAGE,
"%s is neither a month number (1..12) nor a name",
flag_month);
}
}
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)
{
fputs(
"usage: cal [-jy] [[month] year]\n"
" cal [-j] [-m month] [year]\n"
" ncal [-Jjpwy] [-s country_code] [[month] year]\n"
" ncal [-Jeo] [year]\n", stderr);
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];
static int d_first = -1;
if (d_first < 0)
d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
/* 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), d_first ? "%e %B %Y" : "%B %e %Y", &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), "%OB", &tm);
mlines->name[0] = toupper((unsigned char)mlines->name[0]);
/*
* 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), "%OB", &tm);
mlines->name[0] = toupper((unsigned char)mlines->name[0]);
/*
* 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, len;
struct tm tm;
char buf[20];
memset(&tm, 0, sizeof(tm));
for (i = 0; i != 7; i++) {
tm.tm_wday = (i+1) % 7;
strftime(buf, sizeof(buf), "%a", &tm);
len = strlen(buf);
if (len > 2)
len = 2;
strcpy(wds->names[i], " ");
strncpy(wds->names[i] + 2 - len, buf, len);
}
}
/*
* 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);
}
int
parsemonth(const char *s, int *m, int *y)
{
int nm, ny;
char *cp;
struct tm tm;
nm = (int)strtol(s, &cp, 10);
if (cp != s) {
ny = *y;
if (*cp == '\0') {
; /* no special action */
} else if (*cp == 'f' || *cp == 'F') {
if (nm <= *m)
ny++;
} else if (*cp == 'p' || *cp == 'P') {
if (nm >= *m)
ny--;
} else
return (1);
if (nm < 1 || nm > 12)
return 1;
*m = nm;
*y = ny;
return (0);
}
if (strptime(s, "%B", &tm) != NULL || strptime(s, "%b", &tm) != NULL) {
*m = tm.tm_mon + 1;
return (0);
}
return (1);
}
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