more cleaning

sleep/sleep.c

@@ -0,0 +1,25 @@
+#include <ctype.h> /* isdigit(3) */
+#include <stdlib.h> /* atoi(3) */
+#include <sysexits.h> /* EX_USAGE */
+#include <unistd.h> /* sleep(3) */
+#include "libio.h"
+
+static char *program_name = "sleep";
+
+int main(int argc, char **argv){
+	int s;
+	if(argc != 2){
+usage:		write(2, "Usage: ", 7);
+		fdprint(2, argv[0] == NULL ? program_name : argv[0]);
+		write(2, " [seconds]\n", 11);
+		return EX_USAGE;
+	}
+	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;
+}