cal(1) cleanup
According to suckless coding guidelines.
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57
cal.c
57
cal.c
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@ -5,14 +5,14 @@
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#include "util.h"
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enum {Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec};
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enum caltype {Julian, Gregorian};
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enum {TRANS_YEAR = 1752, TRANS_MONTH = Sep, TRANS_DAY = 2};
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enum { JAN, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC };
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enum caltype { JULIAN, GREGORIAN };
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enum { TRANS_YEAR = 1752, TRANS_MONTH = SEP, TRANS_DAY = 2 };
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static int
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isleap(int year, enum caltype cal)
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{
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if (cal == Gregorian) {
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if (cal == GREGORIAN) {
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if (year % 400 == 0)
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return 1;
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if (year % 100 == 0)
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@ -28,7 +28,8 @@ static int
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monthlength(int year, int month, enum caltype cal)
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{
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int mdays[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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return (month==Feb && isleap(year,cal)) ? 29 : mdays[month];
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return (month == FEB && isleap(year,cal)) ? 29 : mdays[month];
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}
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/* From http://www.tondering.dk/claus/cal/chrweek.php#calcdow */
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@ -36,15 +37,16 @@ static int
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dayofweek(int year, int month, int dom, enum caltype cal)
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{
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int m, y, a;
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month += 1; /* in this formula, 1 <= month <= 12 */
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a = (14 - month) / 12;
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y = year - a;
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m = month + 12*a - 2;
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m = month + 12 * a - 2;
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if (cal == Gregorian)
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return (dom + y + y/4 - y/100 + y/400 + (31*m)/12) % 7;
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if (cal == GREGORIAN)
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return (dom + y + y / 4 - y / 100 + y / 400 + (31 * m) / 12) % 7;
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else /* cal == Julian */
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return (5 + dom + y + y/4 + (31*m)/12) % 7;
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return (5 + dom + y + y / 4 + (31 * m) / 12) % 7;
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}
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static void
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@ -52,23 +54,23 @@ printgrid(int year, int month, int fday, int line)
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{
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enum caltype cal;
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int trans; /* are we in the transition from Julian to Gregorian? */
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int offset, dom, d=0;
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int offset, dom, d = 0;
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if (year < TRANS_YEAR || (year == TRANS_YEAR && month <= TRANS_MONTH))
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cal = Julian;
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cal = JULIAN;
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else
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cal = Gregorian;
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cal = GREGORIAN;
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trans = (year == TRANS_YEAR && month == TRANS_MONTH);
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offset = dayofweek(year, month, 1, cal) - fday;
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if (offset < 0)
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offset += 7;
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if (line==1) {
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if (line == 1) {
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for ( ; d < offset; ++d)
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printf(" ");
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dom = 1;
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} else {
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dom = 8-offset + (line-2)*7;
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if (trans && !(line==2 && fday==3))
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dom = 8 - offset + (line - 2) * 7;
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if (trans && !(line == 2 && fday == 3))
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dom += 11;
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}
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for ( ; d < 7 && dom <= monthlength(year, month, cal); ++d, ++dom) {
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@ -92,8 +94,8 @@ drawcal(int year, int month, int ncols, int nmons, int fday)
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for (m = 0; m < nmons; ) {
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n = m;
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for (col = 0; m < nmons && col < ncols; ++col, ++m) {
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cur_year = year + m/12;
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cur_month = month + m%12;
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cur_year = year + m / 12;
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cur_month = month + m % 12;
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if (cur_month > 11) {
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cur_month -= 12;
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cur_year += 1;
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@ -103,15 +105,15 @@ drawcal(int year, int month, int ncols, int nmons, int fday)
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}
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printf("\n");
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for (col = 0, m = n; m < nmons && col < ncols; ++col, ++m) {
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for (dow = fday; dow < (fday+7); ++dow)
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printf("%s ", days[dow%7]);
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for (dow = fday; dow < (fday + 7); ++dow)
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printf("%s ", days[dow % 7]);
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printf(" ");
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}
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printf("\n");
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for (line=1; line<=6; ++line) {
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for (col=0, m=n; m<nmons && col<ncols; ++col, ++m) {
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cur_year = year + m/12;
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cur_month = month + m%12;
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for (line = 1; line <= 6; ++line) {
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for (col = 0, m = n; m < nmons && col < ncols; ++col, ++m) {
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cur_year = year + m / 12;
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cur_month = month + m % 12;
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if (cur_month > 11) {
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cur_month -= 12;
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cur_year += 1;
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@ -127,9 +129,8 @@ drawcal(int year, int month, int ncols, int nmons, int fday)
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static void
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usage(void)
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{
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eprintf("usage: %s [-1] [-3] [-m] [-s] [-y] [-c columns]"
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" [-f firstday] [-n nmonths] [ [month] year]\n",
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argv0);
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eprintf("usage: %s [-1 | -3 | -y | -n nmonths] "
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"[-s | -m | -f firstday] [-c columns] [[[day] month] year]\n", argv0);
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}
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int
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@ -155,7 +156,7 @@ main(int argc, char *argv[])
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case '3':
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nmons = 3;
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month -= 1;
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if(month == 0) {
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if (month == 0) {
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month = 12;
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year--;
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}
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@ -209,7 +210,7 @@ main(int argc, char *argv[])
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usage();
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}
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drawcal(year, month-1, ncols, nmons, fday);
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drawcal(year, month - 1, ncols, nmons, fday);
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return 0;
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}
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