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uptime: new usage & fix coding style

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Coding style fixed and more readable help output.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
This commit is contained in:
Sami Kerola 2011-06-04 21:33:11 +02:00
parent 61db37d48f
commit 05765771c2
1 changed files with 40 additions and 12 deletions
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52
uptime.c
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@ -1,17 +1,45 @@
#include <errno.h>
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "proc/whattime.h"
#include "proc/version.h"
int main(int argc, char *argv[]) {
if(argc == 1) {
print_uptime();
return 0;
}
if((argc == 2) && (!strcmp(argv[1], "-V"))) {
display_version();
return 0;
}
fprintf(stderr, "usage: uptime [-V]\n -V display version\n");
return 1;
static void __attribute__ ((__noreturn__))
usage(FILE * out)
{
fprintf(out,
"\nUsage: %s [options]\n"
"\nOptions:\n", program_invocation_short_name);
fprintf(out,
" -h, --help display this help text\n"
" -V, --version display version information and exit\n");
fprintf(out, "\nFor more information see uptime(1).\n");
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
int c;
static const struct option longopts[] = {
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'V'},
{NULL, 0, NULL, 0}
};
while ((c = getopt_long(argc, argv, "hV", longopts, NULL)) != -1)
switch (c) {
case 'h':
usage(stdout);
case 'V':
display_version();
return EXIT_SUCCESS;
default:
usage(stderr);
}
print_uptime();
return EXIT_SUCCESS;
}