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Add date(1) -drs options.

This commit is contained in:
Jonas 'Sortie' Termansen 2023-03-25 14:26:10 +01:00
parent e9e57dc9af
commit 2799f04cad
1 changed files with 47 additions and 8 deletions
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55
utils/date.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2013, 2021 Jonas 'Sortie' Termansen.
* Copyright (c) 2013, 2021, 2023 Jonas 'Sortie' Termansen.
* Copyright (c) 2022 Juhani 'nortti' Krekelä.
* Copyright (c) 2022 Dennis Wölfing.
*
@ -19,6 +19,8 @@
* Print or set system date and time.
*/
#include <sys/stat.h>
#include <err.h>
#include <stdbool.h>
#include <stdint.h>
@ -50,13 +52,18 @@ static char* astrftime(const char* format, const struct tm* tm)
int main(int argc, char* argv[])
{
const char* format = "+%a %b %e %H:%M:%S %Z %Y";
const char* date = NULL;
bool set = false;
const char* reference = NULL;
int opt;
while ( (opt = getopt(argc, argv, "u")) != -1 )
while ( (opt = getopt(argc, argv, "d:r:s:u")) != -1 )
{
switch ( opt )
{
case 'd': date = optarg; break;
case 'r': reference = optarg; break;
case 's': date = optarg; set = true; break;
case 'u':
if ( setenv("TZ", "UTC0", 1) )
err(1, "setenv");
@ -65,20 +72,52 @@ int main(int argc, char* argv[])
}
}
if ( date && reference )
errx(1, "the -d and -r options are mutually incompatible");
if ( set && reference )
errx(1, "the -s and -r options are mutually incompatible");
const char* format = "+%a %b %e %H:%M:%S %Z %Y";
if ( 1 <= argc - optind )
{
if ( argv[optind][0] != '+' )
errx(1, "setting the system time is not implemented");
errx(1, "the format specifier must start with a +");
format = argv[optind];
}
if ( 2 <= argc - optind )
errx(1, "unexpected extra operand: %s", argv[optind + 1]);
time_t current_time = time(NULL);
struct timespec moment = {0};
struct tm tm = {0};
struct tm tm;
if ( !localtime_r(&current_time, &tm) )
err(1, "localtime_r(%ji)", (intmax_t) current_time);
if ( date )
{
memset(&tm, 0, sizeof(tm));
if ( !strptime(date, format + 1, &tm) )
errx(1, "date didn't match %s: %s", format + 1, date);
moment.tv_sec = timegm(&tm); // TODO: timelocal
}
else
{
if ( reference )
{
struct stat st;
if ( stat(reference, &st) < 0 )
err(1, "%s", reference);
moment = st.st_mtim;
}
else
clock_gettime(CLOCK_REALTIME, &moment);
if ( !localtime_r(&moment.tv_sec, &tm) )
err(1, "localtime_r(%ji)", (intmax_t) moment.tv_sec);
}
if ( set )
{
if ( clock_settime(CLOCK_REALTIME, &moment) < 0 )
err(1, "clock_settime: CLOCK_REALTIME");
return 0;
}
char* string = astrftime(format, &tm);
if ( !string )