Split wildcard_cmp into its own component

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

Makefile

@@ -20,7 +20,8 @@ OBJECTS = \
 	jwt.o \
 	main.o \
 	page.o \
-	server.o
+	server.o \
+	wildcard_cmp.o \
 
 all: $(PROJECT)
 

handler.c

@@ -3,6 +3,7 @@
 #include "handler.h"
 #include "http.h"
 #include "server.h"
+#include "wildcard_cmp.h"
 #include <errno.h>
 #include <stdbool.h>
 #include <stddef.h>
@@ -47,48 +48,6 @@ static int on_write(const void *const buf, const size_t n, void *const user)
     return server_write(buf, n, c->c);
 }
 
-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;
-}
-
 static int on_payload(const struct http_payload *const p,
     struct http_response *const r, void *const user)
 {

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;
+}

wildcard_cmp.h

@@ -0,0 +1,6 @@
+#ifndef WILDCARD_CMP_H
+#define WILDCARD_CMP_H
+
+int wildcard_cmp(const char *s, const char *p);
+
+#endif /* WILDCARD_CMP_H */