Minimise bitrot: bytes.Copy -> copy

(compile tested only)

R=r, rsc
https://golang.org/cl/161069

src/pkg/exp/nacl/av/av.go

@@ -12,7 +12,6 @@
 package av
 
 import (
-	"bytes";
 	"exp/draw";
 	"exp/nacl/srpc";
 	"log";
@@ -158,7 +157,7 @@ func videoPollEvent(ev []byte) (err os.Error) {
 		if r == bridge.share.eq.wi {
 			return noEvents
 		}
-		bytes.Copy(ev, &bridge.share.eq.event[r]);
+		copy(ev, &bridge.share.eq.event[r]);
 		bridge.share.eq.ri = (r + 1) % eqsize;
 		return nil;
 	}

src/pkg/exp/nacl/av/event.go

@@ -10,8 +10,7 @@
 package av
 
 import (
-	"bytes";
-	"debug/binary";
+	"encoding/binary";
 	"exp/draw";
 	"log";
 	"os";
@@ -383,7 +382,7 @@ func (r *reader) Read(p []byte) (n int, err os.Error) {
 	if len(b) == 0 && len(p) > 0 {
 		return 0, os.EOF
 	}
-	n = bytes.Copy(p, b);
+	n = copy(p, b);
 	*r = b[n:];
 	return;
 }

src/pkg/exp/nacl/srpc/msg.go

@@ -7,7 +7,6 @@
 package srpc
 
 import (
-	"bytes";
 	"math";
 	"os";
 	"strconv";
@@ -121,7 +120,7 @@ func (r *msgReceiver) recv() (*msg, os.Error) {
 	// returned the total byte count as n.
 	m := new(msg);
 	m.rdata = make([]byte, n);
-	bytes.Copy(m.rdata, &r.data);
+	copy(m.rdata, &r.data);
 
 	// Make a copy of the desc too.
 	// The system call *did* update r.hdr.ndesc.
@@ -219,7 +218,7 @@ func (m *msg) grow(n int) []byte {
 	i := len(m.wdata);
 	if i+n > cap(m.wdata) {
 		a := make([]byte, i, (i+n)*2);
-		bytes.Copy(a, m.wdata);
+		copy(a, m.wdata);
 		m.wdata = a;
 	}
 	m.wdata = m.wdata[0 : i+n];
@@ -250,7 +249,7 @@ func (m *msg) wuint64(x uint64) {
 	b[7] = byte(hi >> 24);
 }
 
-func (m *msg) wbytes(p []byte)	{ bytes.Copy(m.grow(len(p)), p) }
+func (m *msg) wbytes(p []byte)	{ copy(m.grow(len(p)), p) }
 
 func (m *msg) wstring(s string) {
 	b := m.grow(len(s));

src/pkg/syscall/syscall_linux.go

@@ -385,17 +385,6 @@ func Sendto(fd int, p []byte, flags int, to Sockaddr) (errno int) {
 
 //sys	ptrace(request int, pid int, addr uintptr, data uintptr) (errno int)
 
-// See bytes.Copy.
-func bytesCopy(dst, src []byte) int {
-	if len(src) > len(dst) {
-		src = src[0:len(dst)]
-	}
-	for i, x := range src {
-		dst[i] = x
-	}
-	return len(src);
-}
-
 func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, errno int) {
 	// The peek requests are machine-size oriented, so we wrap it
 	// to retrieve arbitrary-length data.
@@ -416,7 +405,7 @@ func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, errno in
 		if errno != 0 {
 			return 0, errno
 		}
-		n += bytesCopy(out, buf[addr%sizeofPtr:]);
+		n += copy(out, buf[addr%sizeofPtr:]);
 		out = out[n:];
 	}
 
@@ -428,7 +417,7 @@ func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, errno in
 		if errno != 0 {
 			return n, errno
 		}
-		copied := bytesCopy(out, &buf);
+		copied := copy(out, &buf);
 		n += copied;
 		out = out[copied:];
 	}
@@ -456,7 +445,7 @@ func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (c
 		if errno != 0 {
 			return 0, errno
 		}
-		n += bytesCopy(buf[addr%sizeofPtr:], data);
+		n += copy(buf[addr%sizeofPtr:], data);
 		word := *((*uintptr)(unsafe.Pointer(&buf[0])));
 		errno = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word);
 		if errno != 0 {
@@ -483,7 +472,7 @@ func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (c
 		if errno != 0 {
 			return n, errno
 		}
-		bytesCopy(&buf, data);
+		copy(&buf, data);
 		word := *((*uintptr)(unsafe.Pointer(&buf[0])));
 		errno = ptrace(pokeReq, pid, addr+uintptr(n), word);
 		if errno != 0 {