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-rw-r--r--parsing.c2
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';