From 0337c71cf45e9b646c1cd4cb39426073623267f2 Mon Sep 17 00:00:00 2001
From: default <nobody@localhost>
Date: Sun, 11 Dec 2022 09:46:27 +0100
Subject: Backport from xs.

---
 xs.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'xs.h')

diff --git a/xs.h b/xs.h
index 63342db..3758c8d 100644
--- a/xs.h
+++ b/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 */
-- 
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