Split wildcard_cmp into its own component

Future commits will make use of this function outside handler.c.

1 files changed, 44 insertions, 0 deletions

diff --git a/wildcard_cmp.c b/wildcard_cmp.c
new file mode 100644
index 0000000..8f7c7c1
--- /dev/null
+++ b/wildcard_cmp.c
@@ -0,0 +1,44 @@
+#include "wildcard_cmp.h"
+#include <string.h>
+
+static int wildcard_cmp(const char *s, const char *p)
+{
+    while (*p && *s)
+    {
+        const char *const wc = strchr(p, '*');
+
+        if (!wc)
+            return strcmp(s, p);
+
+        const size_t n = wc - p;
+
+        if (n)
+        {
+            const int r = strncmp(s, p, n);
+
+            if (r)
+                return r;
+
+            p += n;
+            s += n;
+        }
+        else if (*(wc + 1) == *s)
+        {
+            p = wc + 1;
+            s += n;
+        }
+        else if (*(wc + 1) == '*')
+            p++;
+        else
+        {
+            s++;
+            p += n;
+        }
+    }
+
+    while (*p)
+        if (*p++ != '*')
+            return -1;
+
+    return 0;
+}