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Add -u option to date(1).

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Co-authored-by: Dennis Wölfing <denniswoelfing@gmx.de>
This commit is contained in:
Juhani Krekelä 2022-06-16 18:53:28 +03:00
parent 5679b74675
commit 184f99e1ee
1 changed files with 23 additions and 6 deletions
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29
utils/date.c
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@ -1,5 +1,7 @@
/*
* Copyright (c) 2013, 2021 Jonas 'Sortie' Termansen.
* Copyright (c) 2022 Juhani 'nortti' Krekelä.
* Copyright (c) 2022 Dennis Wölfing.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@ -24,6 +26,7 @@
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
// Note: There's no way to discern whether the format string was too long for
// the output buffer or if the output was simply empty, so don't call this
@ -49,14 +52,27 @@ int main(int argc, char* argv[])
{
const char* format = "+%a %b %e %H:%M:%S %Z %Y";
if ( 2 <= argc )
int opt;
while ( (opt = getopt(argc, argv, "u")) != -1 )
{
if ( argv[1][0] != '+' )
errx(1, "setting the system time is not implemented");
format = argv[1];
switch ( opt )
{
case 'u':
if ( setenv("TZ", "UTC0", 1) )
err(1, "setenv");
break;
default: return 1;
}
if ( 3 <= argc )
errx(1, "unexpected extra operand: %s", argv[2]);
}
if ( 1 <= argc - optind )
{
if ( argv[optind][0] != '+' )
errx(1, "setting the system time is not implemented");
format = argv[optind];
}
if ( 2 <= argc - optind )
errx(1, "unexpected extra operand: %s", argv[optind + 1]);
time_t current_time = time(NULL);
@ -69,6 +85,7 @@ int main(int argc, char* argv[])
err(1, "malloc");
if ( printf("%s\n", string + 1) == EOF )
err(1, "stdout");
free(string);
if ( ferror(stdout) || fflush(stdout) == EOF )
err(1, "stdout");
return 0;