X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;ds=sidebyside;f=ccan%2Fmem%2Fmem.c;h=5eb15070ed3c3f9f5bf8d2dd8b0d0f060ffa1766;hb=780297d2024c0892a43b9b1b8eabb9bf385c9c7b;hp=5b4b3508090dfb10dc7eea9236eb42ed54b92834;hpb=428d3b0217b32892c2fd309358619a4877113833;p=ccan

diff --git a/ccan/mem/mem.c b/ccan/mem/mem.c
index 5b4b3508..5eb15070 100644
--- a/ccan/mem/mem.c
+++ b/ccan/mem/mem.c
@@ -88,3 +88,22 @@ void memswap(void *a, void *b, size_t n)
 		n -= m;
 	}
 }
+
+bool memeqzero(const void *data, size_t length)
+{
+	const unsigned char *p = data;
+	size_t len;
+
+	/* Check first 16 bytes manually */
+	for (len = 0; len < 16; len++) {
+		if (!length)
+			return true;
+		if (*p)
+			return false;
+		p++;
+		length--;
+	}
+
+	/* Now we know that's zero, memcmp with self. */
+	return memcmp(data, p, length) == 0;
+}