wildcard_cmp.c: Fix out-of-bounds cmp

When the distance between '*' on a wildcard expression was larger than
the string to compare with, this would cause an out-of-bounds read
because `n` was not being limited to the strlen(3) from the input
string.

Example:

- s="c", p="*cc*", casecmp=false

Here, the distance between the first and second '*' is 2 bytes, which is
longer than the input string itself (1 byte, not counting the
terminating null byte '\0').

1 files changed, 2 insertions, 1 deletions

diff --git a/wildcard_cmp.c b/wildcard_cmp.c
index dd19d6c..fe0b3e1 100644
--- a/wildcard_cmp.c
+++ b/wildcard_cmp.c
@@ -30,7 +30,8 @@ int wildcard_cmp(const char *s, const char *p, const bool casecmp)
                 return r;
         }
 
-        const size_t n = wc - p;
+        const size_t auxn = wc - p, rem = strlen(s),
+            n = auxn > rem ? rem : auxn;
 
         if (n)
         {