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Add usage() function.

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Using arg.h, fallback to usage() if there is no value for time.
This commit is contained in:
Simon Lieb 2013-08-07 19:45:13 +02:00
parent e8e98a8c1f
commit 10619c50aa
1 changed files with 9 additions and 1 deletions
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10
slow.c
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@ -7,6 +7,11 @@
char *argv0;
void usage() {
printf("usage: %s [-t usec]\n", argv0);
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[]) {
char buffer;
size_t nread;
@ -14,7 +19,10 @@ int main(int argc, char *argv[]) {
ARGBEGIN {
case 't':
useconds = atoi(ARGF());
useconds = atoi(EARGF(usage()));
break;
default:
usage();
} ARGEND;
while((nread = fread(&buffer, 1, sizeof buffer, stdin)) > 0) {