don't let hexify call strlen

hexify had the same issue as bin2hex; and the fix is the same.

2014-02-12  Tom Tromey  <tromey@redhat.com>

	* common/rsp-low.c (hexify): Never take strlen of argument.

2014-02-12  Tom Tromey  <tromey@redhat.com>

	* remote-utils.c (monitor_output): Pass explicit length to
	hexify.

gdb/ChangeLog

@@ -1,3 +1,7 @@
+2014-02-12  Tom Tromey  <tromey@redhat.com>
+
+	* common/rsp-low.c (hexify): Never take strlen of argument.
+
 2014-02-12  Tom Tromey  <tromey@redhat.com>
 
 	* common/rsp-low.c (bin2hex): Never take strlen of argument.

gdb/common/rsp-low.c

@@ -177,10 +177,6 @@ hexify (char *hex, const char *bin, int count)
 {
   int i;
 
-  /* May use a length, or a nul-terminated string as input. */
-  if (count == 0)
-    count = strlen (bin);
-
   for (i = 0; i < count; i++)
     {
       *hex++ = tohex ((*bin >> 4) & 0xf);

gdb/gdbserver/ChangeLog

@@ -1,3 +1,8 @@
+2014-02-12  Tom Tromey  <tromey@redhat.com>
+
+	* remote-utils.c (monitor_output): Pass explicit length to
+	hexify.
+
 2014-02-12  Tom Tromey  <tromey@redhat.com>
 
 	* tracepoint.c: Include rsp-low.h.

gdb/gdbserver/remote-utils.c

@@ -1558,10 +1558,11 @@ relocate_instruction (CORE_ADDR *to, CORE_ADDR oldloc)
 void
 monitor_output (const char *msg)
 {
-  char *buf = xmalloc (strlen (msg) * 2 + 2);
+  int len = strlen (msg);
+  char *buf = xmalloc (len * 2 + 2);
 
   buf[0] = 'O';
-  hexify (buf + 1, msg, 0);
+  hexify (buf + 1, msg, len);
 
   putpkt (buf);
   free (buf);