X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fmem%2Fmem.c;h=5b4b3508090dfb10dc7eea9236eb42ed54b92834;hb=428d3b0217b32892c2fd309358619a4877113833;hp=91c9961a52ecd92d1372dae98b07f54902e25f22;hpb=1c9eb9fb3e8d3f44b03a621166058dbff25610d1;p=ccan

diff --git a/ccan/mem/mem.c b/ccan/mem/mem.c
index 91c9961a..5b4b3508 100644
--- a/ccan/mem/mem.c
+++ b/ccan/mem/mem.c
@@ -2,6 +2,7 @@
 
 #include "config.h"
 
+#include <assert.h>
 #include <string.h>
 #include <ccan/mem/mem.h>
 
@@ -64,3 +65,26 @@ void *memcchr(void const *data, int c, size_t data_len)
 
 	return NULL;
 }
+
+#define MEMSWAP_TMP_SIZE	256
+
+void memswap(void *a, void *b, size_t n)
+{
+	char *ap = a;
+	char *bp = b;
+	char tmp[MEMSWAP_TMP_SIZE];
+
+	assert(!memoverlaps(a, n, b, n));
+
+	while (n) {
+		size_t m = n > MEMSWAP_TMP_SIZE ? MEMSWAP_TMP_SIZE : n;
+
+		memcpy(tmp, bp, m);
+		memcpy(bp, ap, m);
+		memcpy(ap, tmp, m);
+
+		ap += m;
+		bp += m;
+		n -= m;
+	}
+}