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cal: implement -m

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Some people prefer the week to start on Monday.  Add the '-m'
option to support this.

function                                             old     new   delta
cal_main                                             926     966     +40
day_array                                            316     337     +21
packed_usage                                       34151   34158      +7
.rodata                                            99224   99225      +1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/0 up/down: 69/0)               Total: 69 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Ron Yorston 2021-09-21 08:42:58 +01:00 committed by Denys Vlasenko
parent f27a6a94a7
commit 56f0e886db
1 changed files with 25 additions and 13 deletions
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38
util-linux/cal.c
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@ -27,10 +27,11 @@
/* http://www.opengroup.org/onlinepubs/007904975/utilities/cal.html */
//usage:#define cal_trivial_usage
//usage: "[-jy] [[MONTH] YEAR]"
//usage: "[-jmy] [[MONTH] YEAR]"
//usage:#define cal_full_usage "\n\n"
//usage: "Display a calendar\n"
//usage: "\n -j Use julian dates"
//usage: "\n -m Week starts on Monday"
//usage: "\n -y Display the entire year"
#include "libbb.h"
@ -38,6 +39,8 @@
/* We often use "unsigned" instead of "int", it's easier to div on most CPUs */
#define SUNDAY 0
#define MONDAY 1
#define THURSDAY 4 /* for reformation */
#define SATURDAY 6 /* 1 Jan 1 was a Saturday */
@ -81,7 +84,7 @@ static int leap_year(unsigned yr)
((yr) / 4 - centuries_since_1700(yr) + quad_centuries_since_1700(yr))
static void center(char *, unsigned, unsigned);
static void day_array(unsigned, unsigned, unsigned *);
static void day_array(unsigned, unsigned, unsigned, unsigned *);
static void trim_trailing_spaces_and_print(char *);
static void blank_string(char *buf, size_t buflen);
@ -93,12 +96,18 @@ static char *build_row(char *p, unsigned *dp);
#define J_WEEK_LEN (WEEK_LEN + 7)
#define HEAD_SEP 2 /* spaces between day headings */
enum {
OPT_JULIAN = (1 << 0),
OPT_MONDAY = (1 << 1),
OPT_YEAR = (1 << 2),
};
int cal_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int cal_main(int argc UNUSED_PARAM, char **argv)
{
struct tm zero_tm;
time_t now;
unsigned month, year, flags, i;
unsigned month, year, flags, i, weekstart;
char *month_names[12];
/* normal heading: */
/* "Su Mo Tu We Th Fr Sa" */
@ -110,10 +119,11 @@ int cal_main(int argc UNUSED_PARAM, char **argv)
init_unicode();
flags = getopt32(argv, "jy");
/* This sets julian = flags & 1: */
option_mask32 &= 1;
flags = getopt32(argv, "jmy");
/* This sets julian = flags & OPT_JULIAN: */
option_mask32 &= OPT_JULIAN;
month = 0;
weekstart = (flags & OPT_MONDAY) ? MONDAY : SUNDAY;
argv += optind;
if (!argv[0]) {
@ -122,7 +132,7 @@ int cal_main(int argc UNUSED_PARAM, char **argv)
time(&now);
ptm = localtime(&now);
year = ptm->tm_year + 1900;
if (!(flags & 2)) { /* no -y */
if (!(flags & OPT_YEAR)) { /* no -y */
month = ptm->tm_mon + 1;
}
} else {
@ -130,7 +140,7 @@ int cal_main(int argc UNUSED_PARAM, char **argv)
if (argv[2]) {
bb_show_usage();
}
if (!(flags & 2)) { /* no -y */
if (!(flags & OPT_YEAR)) { /* no -y */
month = xatou_range(*argv, 1, 12);
}
argv++;
@ -148,7 +158,7 @@ int cal_main(int argc UNUSED_PARAM, char **argv)
month_names[i] = xstrdup(buf);
if (i < 7) {
zero_tm.tm_wday = i;
zero_tm.tm_wday = (i + weekstart) % 7;
/* abbreviated weekday name according to locale */
strftime(buf, sizeof(buf), "%a", &zero_tm);
#if ENABLE_UNICODE_SUPPORT
@ -173,7 +183,7 @@ int cal_main(int argc UNUSED_PARAM, char **argv)
unsigned *dp = days;
char lineout[30];
day_array(month, year, dp);
day_array(month, year, weekstart, dp);
len = sprintf(lineout, "%s %u", month_names[month - 1], year);
printf("%*s%s\n%s\n",
((7*julian + WEEK_LEN) - len) / 2, "",
@ -197,7 +207,7 @@ int cal_main(int argc UNUSED_PARAM, char **argv)
);
puts("\n"); /* two \n's */
for (i = 0; i < 12; i++) {
day_array(i + 1, year, days[i]);
day_array(i + 1, year, weekstart, days[i]);
}
blank_string(lineout, sizeof(lineout));
week_len = WEEK_LEN + julian * (J_WEEK_LEN - WEEK_LEN);
@ -233,7 +243,8 @@ int cal_main(int argc UNUSED_PARAM, char **argv)
* out end to end. You would have 42 numbers or spaces. This routine
* builds that array for any month from Jan. 1 through Dec. 9999.
*/
static void day_array(unsigned month, unsigned year, unsigned *days)
static void day_array(unsigned month, unsigned year, unsigned weekstart,
unsigned *days)
{
unsigned long temp;
unsigned i;
@ -249,7 +260,7 @@ static void day_array(unsigned month, unsigned year, unsigned *days)
size_t oday = 0;
do {
days[oday+2] = sep1752[oday] + j_offset;
days[oday+2-weekstart] = sep1752[oday] + j_offset;
} while (++oday < sizeof(sep1752));
return;
@ -280,6 +291,7 @@ static void day_array(unsigned month, unsigned year, unsigned *days)
} else {
dw = (((temp - 1 + SATURDAY) - NUMBER_MISSING_DAYS) % 7);
}
dw = (dw - weekstart + 7) % 7;
if (!julian) {
day = 1;