use libio

src/sleep.c

@@ -1,20 +1,26 @@
+#include <ctype.h> /* isdigit(3) */
 #include <stdlib.h> /* atoi(3) */
 #include <sysexits.h> /* EX_USAGE */
 #include <unistd.h> /* sleep(3) */
-#include "libstris.h" /* stris(3) */
-#include "noargvzero.h"
+#include "libio.h"
+
+static char *program_name = "sleep";
 
 int main(int argc, char **argv){
 	int s;
-	NOARGVZERO(argv);
-	if(argc != 2 || !stris(STRIS_TYPE_INT, argv[1])){
-		write(2, "Usage: ", 7);
-		for(s = 0; argv[0][s] != '\0'; ++s);
-		write(2, argv[0], s);
+	if(argc != 2){
+usage:		write(2, "Usage: ", 7);
+		if(argv[0] == NULL)
+			argv[0] = program_name;
+		fdprint(2, argv[0]);
 		write(2, " [seconds]\n", 11);
 		return EX_USAGE;
 	}
-	s = atoi(argv[1]);
+	s = parse_uint(argv[1]);
+	while(isdigit(*argv[1]))
+		++argv[1];
+	if(*argv[1] != '\0')
+		goto usage;
 	while(s > 0)
 		s = sleep(s);
 	return s;