1 files changed, 2 insertions, 0 deletions
diff --git a/parsing.c b/parsing.c
index 602e3de..1b2a551 100644
--- a/parsing.c
+++ b/parsing.c

@@ -56,6 +56,8 @@ char *substr(const char *head, const char *tail)
 {
        char *buf;
+        if (tail < head)
+                return xstrdup("");
        buf = xmalloc(tail - head + 1);
        strncpy(buf, head, tail - head);
        buf[tail - head] = '\0';

diff --git a/parsing.c b/parsing.c index 602e3de..1b2a551 100644 --- a/parsing.c +++ b/parsing.c
@@ -56,6 +56,8 @@ char substr(const char head, const char *tail)
56	{	56	{
57	char *buf;	57	char *buf;
58		58
		59	if (tail < head)
		60	return xstrdup("");
59	buf = xmalloc(tail - head + 1);	61	buf = xmalloc(tail - head + 1);
60	strncpy(buf, head, tail - head);	62	strncpy(buf, head, tail - head);
61	buf[tail - head] = '\0';	63	buf[tail - head] = '\0';