From ed1794ffbf6a1ab1dfe40147776a616b054b3170 Mon Sep 17 00:00:00 2001
From: Quinn <quinnthepigeon@proton.me>
Date: Wed, 20 Aug 2025 13:18:45 +0200
Subject: [PATCH] improve number parsing in `opts.c`

---
 src/opts.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/opts.c b/src/opts.c
index 0674e7d..7129201 100644
--- a/src/opts.c
+++ b/src/opts.c
@@ -1,5 +1,6 @@
 #include "opts.h"
 
+#include <errno.h>
 #include <getopt.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ -36,8 +37,11 @@ u8 getoptions(int argc, char *const *argv, int *ncpus) {
 	}
 
 	if (optind < argc) {
+		char *end;
 		char *num = argv[optind];
-		*ncpus = atoi(num);
+		*ncpus = strtol(num, &end, 0);
+		if (errno || end == num || *end != '\0')
+			fatal("failed to parse numeric value from string '%s'", num);
 	} else if (opts & OPT_LIST_CORES) {
 		*ncpus = -1;
 	} else