From 38b4853cf566b119140434de8bf0c7cfb31beb9e Mon Sep 17 00:00:00 2001
From: DTB <trinity@trinity.moe>
Date: Sat, 19 Aug 2023 11:02:19 -0400
Subject: [PATCH] no longer reliant on libio

---
 sleep/Makefile |  7 +++++++
 sleep/sleep.c  | 18 +++++++++---------
 2 files changed, 16 insertions(+), 9 deletions(-)
 create mode 100644 sleep/Makefile

diff --git a/sleep/Makefile b/sleep/Makefile
new file mode 100644
index 0000000..00fc381
--- /dev/null
+++ b/sleep/Makefile
@@ -0,0 +1,7 @@
+sleep: sleep.c
+	$(CC) -g -o sleep sleep.c
+
+clean:
+	rm -f sleep
+
+.PHONY: clean
diff --git a/sleep/sleep.c b/sleep/sleep.c
index 6c0cdf3..75a6681 100644
--- a/sleep/sleep.c
+++ b/sleep/sleep.c
@@ -1,23 +1,23 @@
 #include <ctype.h> /* isdigit(3) */
-#include <stdlib.h> /* atoi(3) */
+#include <errno.h> /* errno */
+#include <stdio.h> /* fprintf(3), stderr */
+#include <stdlib.h> /* strtol(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;
+	extern int errno;
+
 	if(argc != 2){
-usage:		write(2, "Usage: ", 7);
-		fdprint(2, argv[0] == NULL ? program_name : argv[0]);
-		write(2, " [seconds]\n", 11);
+usage:		fprintf(stderr, "Usage: %s [seconds]\n", argv[0] == NULL ? program_name : argv[0]);
 		return EX_USAGE;
 	}
-	s = parse_uint(argv[1]);
-	while(isdigit(*argv[1]))
-		++argv[1];
-	if(*argv[1] != '\0')
+	errno = 0;
+	s = strtol(argv[1], &argv[1], 10);
+	if(*argv[1] != '\0' || errno != 0)
 		goto usage;
 	while(s > 0)
 		s = sleep(s);