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beep: help text

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This commit is contained in:
K. Lange 2018-11-29 20:56:16 +09:00
parent 7bd41a3157
commit 27b9fe5fd1
1 changed files with 19 additions and 1 deletions
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20
apps/beep.c
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@ -53,8 +53,26 @@ int main(int argc, char * argv[]) {
}
int opt;
while ((opt = getopt(argc, argv, "?r:f:l:d:D:n")) != -1) {
while ((opt = getopt(argc, argv, "?hr:f:l:d:D:n")) != -1) {
switch (opt) {
case 'h':
case '?':
fprintf(stderr, "usage: %s BEEP...\n"
"Where BEEP consists of:\n"
" -r REPS \033[3mNumber of repetitions.\033[0m\n"
" -f FREQ \033[3mFrequency in Hz. 440 is A4. Supports fractional values.\033[0m\n"
" -l TIME \033[3mDuration in milliseconds.\033[0m\n"
" -d TIME \033[3mDelay between repetitions in milliseconds.\033[0m\n"
" -D TIME \033[3mDelay between, and after, repetitions.\033[0m\n"
" -n \033[3mStart a new beep.\033[0m\n"
"\n"
"The default values are:\n"
" -r 1 -l %d -f %.2f -d %d\n"
"\n"
"A length of -1 will start a sustained beep without blocking.\n"
"A length of 0 will stop a currently playing sustained beep.\n",
argv[0], DEFAULT_LEN, DEFAULT_FREQ, DEFAULT_DELAY);
return 1;
case 'r':
repetitions = atoi(optarg);
break;