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Audit cal(1)

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1) Update manpage with the num-syntax.
2) Use size_t for years and derivatives.
3) Use putchar instead of printf wherever possible.
4) Update usage().
5) Style changes.
This commit is contained in:
FRIGN
2015-03-08 21:28:32 +01:00
parent f140403fca
commit 76ad86b2a3
3 changed files with 64 additions and 63 deletions
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61
cal.c
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@@ -1,5 +1,6 @@
/* See LICENSE file for copyright and license details. */
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
@@ -11,7 +12,7 @@ enum caltype { JULIAN, GREGORIAN };
enum { TRANS_YEAR = 1752, TRANS_MONTH = SEP, TRANS_DAY = 2 };
static int
isleap(int year, enum caltype cal)
isleap(size_t year, enum caltype cal)
{
if (cal == GREGORIAN) {
if (year % 400 == 0)
@@ -26,23 +27,23 @@ isleap(int year, enum caltype cal)
}
static int
monthlength(int year, int month, enum caltype cal)
monthlength(size_t year, int month, enum caltype cal)
{
int mdays[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
return (month == FEB && isleap(year,cal)) ? 29 : mdays[month];
return (month == FEB && isleap(year, cal)) ? 29 : mdays[month];
}
/* From http://www.tondering.dk/claus/cal/chrweek.php#calcdow */
static int
dayofweek(int year, int month, int dom, enum caltype cal)
dayofweek(size_t year, int month, int dom, enum caltype cal)
{
int m, y, a;
size_t y;
int m, a;
month += 1; /* in this formula, 1 <= month <= 12 */
a = (14 - month) / 12;
a = (13 - month) / 12;
y = year - a;
m = month + 12 * a - 2;
m = month + 12 * a - 1;
if (cal == GREGORIAN)
return (dom + y + y / 4 - y / 100 + y / 400 + (31 * m) / 12) % 7;
@@ -51,22 +52,19 @@ dayofweek(int year, int month, int dom, enum caltype cal)
}
static void
printgrid(int year, int month, int fday, int line)
printgrid(size_t year, int month, int fday, int line)
{
enum caltype cal;
int trans; /* are we in the transition from Julian to Gregorian? */
int offset, dom, d = 0;
int offset, dom, d = 0, trans; /* are we in the transition from Julian to Gregorian? */
if (year < TRANS_YEAR || (year == TRANS_YEAR && month <= TRANS_MONTH))
cal = JULIAN;
else
cal = GREGORIAN;
cal = (year < TRANS_YEAR || (year == TRANS_YEAR && month <= TRANS_MONTH)) ? JULIAN : GREGORIAN;
trans = (year == TRANS_YEAR && month == TRANS_MONTH);
offset = dayofweek(year, month, 1, cal) - fday;
if (offset < 0)
offset += 7;
if (line == 1) {
for ( ; d < offset; ++d)
for (; d < offset; ++d)
printf(" ");
dom = 1;
} else {
@@ -74,23 +72,24 @@ printgrid(int year, int month, int fday, int line)
if (trans && !(line == 2 && fday == 3))
dom += 11;
}
for ( ; d < 7 && dom <= monthlength(year, month, cal); ++d, ++dom) {
for (; d < 7 && dom <= monthlength(year, month, cal); ++d, ++dom) {
printf("%2d ", dom);
if (trans && dom==TRANS_DAY)
if (trans && dom == TRANS_DAY)
dom += 11;
}
for ( ; d < 7; ++d)
for (; d < 7; ++d)
printf(" ");
}
static void
drawcal(int year, int month, int ncols, int nmons, int fday)
drawcal(size_t year, int month, size_t ncols, size_t nmons, int fday)
{
char *smon[] = {" January", " February", " March", " April",
" May", " June", " July", " August",
"September", " October", " November", " December" };
char *days[] = { "Su", "Mo", "Tu", "We", "Th", "Fr", "Sa", };
int m, n, col, cur_year, cur_month, line, dow;
size_t m, n, col, cur_year, cur_month, dow;
int line;
for (m = 0; m < nmons; ) {
n = m;
@@ -101,16 +100,16 @@ drawcal(int year, int month, int ncols, int nmons, int fday)
cur_month -= 12;
cur_year += 1;
}
printf(" %s %d ", smon[cur_month], cur_year);
printf(" %s %zu ", smon[cur_month], cur_year);
printf(" ");
}
printf("\n");
putchar('\n');
for (col = 0, m = n; m < nmons && col < ncols; ++col, ++m) {
for (dow = fday; dow < (fday + 7); ++dow)
printf("%s ", days[dow % 7]);
printf(" ");
}
printf("\n");
putchar('\n');
for (line = 1; line <= 6; ++line) {
for (col = 0, m = n; m < nmons && col < ncols; ++col, ++m) {
cur_year = year + m / 12;
@@ -122,7 +121,7 @@ drawcal(int year, int month, int ncols, int nmons, int fday)
printgrid(cur_year, cur_month, fday, line);
printf(" ");
}
printf("\n");
putchar('\n');
}
}
}
@@ -130,16 +129,17 @@ drawcal(int year, int month, int ncols, int nmons, int fday)
static void
usage(void)
{
eprintf("usage: %s [-1 | -3 | -y | -n nmonths] "
"[-s | -m | -f firstday] [-c columns] [[month] year]\n", argv0);
eprintf("usage: %s [-1 | -3 | -y | -n num] "
"[-s | -m | -f num] [-c num] [[month] year]\n", argv0);
}
int
main(int argc, char *argv[])
{
struct tm *ltime;
int year, ncols, nmons, month, fday;
time_t now;
size_t year, ncols, nmons;
int fday, month;
now = time(NULL);
ltime = localtime(&now);
@@ -156,14 +156,13 @@ main(int argc, char *argv[])
break;
case '3':
nmons = 3;
month -= 1;
if (month == 0) {
if (--month == 0) {
month = 12;
year--;
}
break;
case 'c':
ncols = estrtonum(EARGF(usage()), 0, INT_MAX);
ncols = estrtonum(EARGF(usage()), 0, MIN(SIZE_MAX, LLONG_MAX));
break;
case 'f':
fday = estrtonum(EARGF(usage()), 0, 6);