Add libfuse util strtol wrapper

Add a wrapper around strtol for more rigorous error checking
and convert uses of atoi and strtol to use this instead.

1 files changed, 27 insertions, 0 deletions

diff --git a/lib/util.c b/lib/util.c
new file mode 100644
index 0000000..a529d38
--- /dev/null
+++ b/lib/util.c
@@ -0,0 +1,27 @@
+#include <stdlib.h>
+#include <errno.h>
+
+#include "util.h"
+
+int libfuse_strtol(const char *str, long *res)
+{
+	char *endptr;
+	int base = 10;
+	long val;
+
+	errno = 0;
+
+	if (!str)
+		return -EINVAL;
+
+	val = strtol(str, &endptr, base);
+
+	if (errno)
+	       return -errno;
+
+	if (endptr == str || *endptr != '\0')
+		return -EINVAL;
+
+	*res = val;
+	return 0;
+}