Audit cal(1)
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.
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README
2
README
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@ -10,7 +10,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
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UTILITY POSIX 2008 COMPLIANT MISSING OPTIONS
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------- -------------------- ---------------
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=*| basename yes none
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=* cal yes none
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=*| cal yes none
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=*| cat yes none
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=* chgrp yes none
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=*| chmod yes none
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64
cal.1
64
cal.1
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@ -1,4 +1,4 @@
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.Dd January 18, 2015
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.Dd March 8, 2015
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.Dt CAL 1
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.Os sbase
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.Sh NAME
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@ -6,53 +6,55 @@
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.Nd show calendar
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.Sh SYNOPSIS
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.Nm
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.Op Fl 1 | Fl 3 | Fl y | Fl n Ar nmonths
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.Op Fl s | Fl m | Fl f Ar firstday
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.Op Fl c Ar columns
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.Op Fl 1 | Fl 3 | Fl y | Fl n Ar num
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.Op Fl s | Fl m | Fl f Ar num
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.Op Fl c Ar num
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.Oo Oo Ar month Oc Ar year Oc
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.Sh DESCRIPTION
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Print
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.Ar nmonths
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calendars side by side beginning with
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.Nm
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writes a calendar of
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.Ar month
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and
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.Ar year .
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Each row of calendars contains at most
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.Ar columns
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calendars. The date formatting is obtained using
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.Xr localtime 3 .
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.Pp
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.Ar year
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or the current month to stdout.
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If
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.Ar year
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is given without
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.Ar month ,
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print the whole year, unless overridden by other options.
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.Nm
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writes a 3-column calendar of the whole
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year to stdout.
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The date formatting is according to
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.Xr localtime 3 .
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.Pp
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The Julian calendar is used until Sep 2, 1752. The Gregorian calendar is used
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starting the next day on Sep 14, 1752.
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl 1
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Output current month. This is the default.
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Print current month. This is the default.
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.It Fl 3
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Output previous, current and next month.
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.It Fl c Ar columns
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Set number of calendars in a row. The default is 3.
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.It Fl f Ar firstday
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Output
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.Ar firstday
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Print previous, current and next month.
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.It Fl c Ar num
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Print
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.Ar num
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calendars in a row. The default is 3.
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.It Fl f Ar num
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Set
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.Ar num
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(0 is Sunday, 6 is Saturday) as first day of week.
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.It Fl m
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Output Monday as first day of week.
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.It Fl n Ar nmonths
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Output in total
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.Ar nmonths
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starting from the current month.
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Set Monday as first day of week.
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.It Fl n Ar num
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Output
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.Ar num
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months starting from and including the current month.
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.It Fl s
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Output Sunday as first day of week.
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.It Fl y Ar year
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Output an entire
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.Ar year .
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Set Sunday as first day of week.
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.It Fl y
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Print the entire
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.Ar year
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or current year.
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.El
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.Sh SEE ALSO
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.Xr localtime 3
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@ -64,5 +66,5 @@ utility is compliant with the
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specification.
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.Pp
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The flags
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.Op Fl 13ynsmfc
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.Op Fl 13cfmnsy
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are an extension to that specification.
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61
cal.c
61
cal.c
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@ -1,5 +1,6 @@
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/* See LICENSE file for copyright and license details. */
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#include <limits.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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@ -11,7 +12,7 @@ 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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isleap(size_t year, enum caltype cal)
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{
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if (cal == GREGORIAN) {
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if (year % 400 == 0)
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@ -26,23 +27,23 @@ isleap(int year, enum caltype cal)
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}
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static int
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monthlength(int year, int month, enum caltype cal)
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monthlength(size_t 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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static int
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dayofweek(int year, int month, int dom, enum caltype cal)
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dayofweek(size_t year, int month, int dom, enum caltype cal)
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{
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int m, y, a;
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size_t y;
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int m, 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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a = (13 - 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 - 1;
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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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@ -51,22 +52,19 @@ dayofweek(int year, int month, int dom, enum caltype cal)
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}
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static void
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printgrid(int year, int month, int fday, int line)
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printgrid(size_t 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, trans; /* are we in the transition from Julian to Gregorian? */
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if (year < TRANS_YEAR || (year == TRANS_YEAR && month <= TRANS_MONTH))
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cal = JULIAN;
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else
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cal = GREGORIAN;
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cal = (year < TRANS_YEAR || (year == TRANS_YEAR && month <= TRANS_MONTH)) ? JULIAN : 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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for ( ; d < offset; ++d)
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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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@ -74,23 +72,24 @@ printgrid(int year, int month, int fday, int line)
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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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for (; d < 7 && dom <= monthlength(year, month, cal); ++d, ++dom) {
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printf("%2d ", dom);
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if (trans && dom==TRANS_DAY)
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if (trans && dom == TRANS_DAY)
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dom += 11;
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}
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for ( ; d < 7; ++d)
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for (; d < 7; ++d)
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printf(" ");
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}
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static void
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drawcal(int year, int month, int ncols, int nmons, int fday)
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drawcal(size_t year, int month, size_t ncols, size_t nmons, int fday)
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{
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char *smon[] = {" January", " February", " March", " April",
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" May", " June", " July", " August",
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"September", " October", " November", " December" };
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char *days[] = { "Su", "Mo", "Tu", "We", "Th", "Fr", "Sa", };
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int m, n, col, cur_year, cur_month, line, dow;
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size_t m, n, col, cur_year, cur_month, dow;
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int line;
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for (m = 0; m < nmons; ) {
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n = m;
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@ -101,16 +100,16 @@ drawcal(int year, int month, int ncols, int nmons, int fday)
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cur_month -= 12;
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cur_year += 1;
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}
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printf(" %s %d ", smon[cur_month], cur_year);
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printf(" %s %zu ", smon[cur_month], cur_year);
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printf(" ");
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}
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printf("\n");
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putchar('\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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printf(" ");
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}
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printf("\n");
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putchar('\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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@ -122,7 +121,7 @@ drawcal(int year, int month, int ncols, int nmons, int fday)
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printgrid(cur_year, cur_month, fday, line);
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printf(" ");
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}
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printf("\n");
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putchar('\n');
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}
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}
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}
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@ -130,16 +129,17 @@ 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 | -y | -n nmonths] "
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"[-s | -m | -f firstday] [-c columns] [[month] year]\n", argv0);
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eprintf("usage: %s [-1 | -3 | -y | -n num] "
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"[-s | -m | -f num] [-c num] [[month] year]\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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struct tm *ltime;
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int year, ncols, nmons, month, fday;
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time_t now;
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size_t year, ncols, nmons;
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int fday, month;
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now = time(NULL);
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ltime = localtime(&now);
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@ -156,14 +156,13 @@ main(int argc, char *argv[])
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break;
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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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break;
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case 'c':
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ncols = estrtonum(EARGF(usage()), 0, INT_MAX);
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ncols = estrtonum(EARGF(usage()), 0, MIN(SIZE_MAX, LLONG_MAX));
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break;
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case 'f':
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fday = estrtonum(EARGF(usage()), 0, 6);
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