add hg and python

1 files changed, 25 insertions, 0 deletions

diff --git a/sys/src/cmd/python/Python/memmove.c b/sys/src/cmd/python/Python/memmove.c
new file mode 100644
index 000000000..6fb0dad93
--- /dev/null
+++ b/sys/src/cmd/python/Python/memmove.c
@@ -0,0 +1,25 @@
+
+/* A perhaps slow but I hope correct implementation of memmove */
+
+extern char *memcpy(char *, char *, int);
+
+char *
+memmove(char *dst, char *src, int n)
+{
+	char *realdst = dst;
+	if (n <= 0)
+		return dst;
+	if (src >= dst+n || dst >= src+n)
+		return memcpy(dst, src, n);
+	if (src > dst) {
+		while (--n >= 0)
+			*dst++ = *src++;
+	}
+	else if (src < dst) {
+		src += n;
+		dst += n;
+		while (--n >= 0)
+			*--dst = *--src;
+	}
+	return realdst;
+}