util: strtotime: stricter time parsing

as input: an empty string or non-digit characters are digits are considered an
error now. Still, for the format tools output the formatted time string as
time_t 0 on a parse error.

1 files changed, 3 insertions, 2 deletions

diff --git a/util.c b/util.c
index a22b235..6f4b04e 100644
--- a/util.c
+++ b/util.c
@@ -188,10 +188,11 @@ int
 strtotime(const char *s, time_t *t)
 {
 	long l;
+	char *e;
 
 	errno = 0;
-	l = strtol(s, NULL, 10);
-	if (errno != 0)
+	l = strtol(s, &e, 10);
+	if (*s == '\0' || *e != '\0')
 		return -1;
 	if (t)
 		*t = (time_t)l;