Backport from xs.

xs.h

@@ -90,6 +90,7 @@ d_char *xs_number_new(double f);
 double xs_number_get(const char *v);
 const char *xs_number_str(const char *v);
 
+void *xs_memmem(const char *haystack, int h_size, const char *needle, int n_size);
 
 #ifdef XS_IMPLEMENTATION
 
@@ -907,6 +908,23 @@ const char *xs_number_str(const char *v)
 }
 
 
+void *xs_memmem(const char *haystack, int h_size, const char *needle, int n_size)
+/* clone of memmem */
+{
+    char *p, *r = NULL;
+    int offset = 0;
+
+    while (!r && h_size - offset > n_size && (p = strchr(haystack + offset, *needle))) {
+        if (memcmp(p, needle, n_size) == 0)
+            r = p;
+        else
+            offset = p - haystack + 1;
+    }
+
+    return r;
+}
+
+
 #endif /* XS_IMPLEMENTATION */
 
 #endif /* _XS_H */

xs_httpd.h

@@ -69,8 +69,6 @@ d_char *xs_url_vars(char *str)
 }
 
 
-void *memmem(const void *, size_t, const void *, size_t);
-
 d_char *_xs_multipart_form_data(char *payload, int p_size, char *header)
 /* parses a multipart/form-data payload */
 {
@@ -94,7 +92,7 @@ d_char *_xs_multipart_form_data(char *payload, int p_size, char *header)
     d_char *p_vars = xs_dict_new();
 
     /* iterate searching the boundaries */
-    while ((p = memmem(payload + offset, p_size - offset, boundary, bsz)) != NULL) {
+    while ((p = xs_memmem(payload + offset, p_size - offset, boundary, bsz)) != NULL) {
         xs *s1 = NULL;
         xs *l1 = NULL;
         char *vn = NULL;
@@ -133,13 +131,13 @@ d_char *_xs_multipart_form_data(char *payload, int p_size, char *header)
         }
 
         /* find the start of the part content */
-        if ((p = memmem(p, p_size - offset, "\r\n\r\n", 4)) == NULL)
+        if ((p = xs_memmem(p, p_size - offset, "\r\n\r\n", 4)) == NULL)
             break;
 
         p += 4;
 
         /* find the next boundary */
-        if ((q = memmem(p, p_size - offset, boundary, bsz)) == NULL)
+        if ((q = xs_memmem(p, p_size - offset, boundary, bsz)) == NULL)
             break;
 
         po = p - payload;

xs_version.h

@@ -1 +1 @@
-/* ad1c7ba748725abdecc1f1124d697f9130c49e87 */
+/* 3aa82bc4fc310ec95194602bed88a9767e100350 */