Add parameter forcing flush after each bytes.

slow.c

@@ -8,7 +8,7 @@
 char *argv0;
 
 void usage() {
-	printf("usage: %s [-t usec]\n", argv0);
+	printf("usage: %s [-t usec] [-F]\n", argv0);
 	exit(EXIT_FAILURE);
 }
 
@@ -16,11 +16,15 @@ int main(int argc, char *argv[]) {
 	char		buffer;
 	size_t		nread;
 	useconds_t	useconds	= 1000000; // default 1 second
+	unsigned int	flush		= 0;
 
 	ARGBEGIN {
 	case 't':
 		useconds = atoi(EARGF(usage()));
 		break;
+	case 'F':
+		flush = 1;
+		break;
 	default:
 		usage();
 	} ARGEND;
@@ -28,6 +32,9 @@ int main(int argc, char *argv[]) {
 	while((nread = fread(&buffer, 1, sizeof buffer, stdin)) > 0) {
 		usleep(useconds);
 		fwrite(&buffer, 1, nread, stdout);
+		if(flush) {
+			fflush(stdout);
+		}
 	}
 
 	return 0;

todo.txt

@@ -1,4 +1,4 @@
-- [ ] Add forced flush option. -f ? -F ?
+- [x] Add forced flush option. -f ? -F ?
 - [ ] Write man page
 - [ ] Send errors to sderr
 - [ ] Release v1