* process.c (allocate_pty): Let PTY_ITERATION declare iteration vars.

That way, the code declares only the vars that it needs.
* s/aix4-2.h (PTY_ITERATION): Declare iteration vars.
* s/cygwin.h (PTY_ITERATION): Likewise.
* s/darwin.h (PTY_ITERATION): Likewise.
* s/gnu-linux.h (PTY_ITERATION): Likewise.

src/ChangeLog

 2011-03-17  Paul Eggert  <eggert@cs.ucla.edu>
+	* process.c (allocate_pty): Let PTY_ITERATION declare iteration vars.
+	That way, the code declares only the vars that it needs.
+	* s/aix4-2.h (PTY_ITERATION): Declare iteration vars.
+	* s/cygwin.h (PTY_ITERATION): Likewise.
+	* s/darwin.h (PTY_ITERATION): Likewise.
+	* s/gnu-linux.h (PTY_ITERATION): Likewise.
+
 	* s/irix6-5.h (PTY_OPEN): Declare stb, to loosen coupling.
 	* process.c (allocate_pty): Don't declare stb unless it's needed.

src/process.c

@@ -535,12 +535,12 @@ static char pty_name[24];
 static int
 allocate_pty (void)
 {
-  register int c, i;
   int fd;
 
 #ifdef PTY_ITERATION
   PTY_ITERATION
 #else
+  register int c, i;
   for (c = FIRST_PTY_LETTER; c <= 'z'; c++)
     for (i = 0; i < 16; i++)
 #endif

src/s/aix4-2.h

@@ -32,7 +32,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* In AIX, you allocate a pty by opening /dev/ptc to get the master side.
    To get the name of the slave side, you just ttyname() the master side.  */
-#define PTY_ITERATION for (c = 0; !c ; c++)
+#define PTY_ITERATION int c; for (c = 0; !c ; c++)
 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptc");
 #define PTY_TTY_NAME_SPRINTF strcpy (pty_name, ttyname (fd));
 

src/s/cygwin.h

@@ -46,7 +46,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Define HAVE_PTYS if the system supports pty devices.  */
 #define HAVE_PTYS
-#define PTY_ITERATION		for (i = 0; i < 1; i++) /* ick */
+#define PTY_ITERATION		int i; for (i = 0; i < 1; i++) /* ick */
 #define PTY_NAME_SPRINTF	/* none */
 #define PTY_TTY_NAME_SPRINTF	/* none */
 #define PTY_OPEN					\
@@ -102,4 +102,3 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Send signals to subprocesses by "typing" special chars at them.  */
 #define SIGNALS_VIA_CHARACTERS
-

src/s/darwin.h

@@ -68,7 +68,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
    Note: PTYs are broken on darwin <6.  Use at your own risk.  */
 #define HAVE_PTYS
 /* Run only once.  We need a `for'-loop because the code uses `continue'.  */
-#define PTY_ITERATION	for (i = 0; i < 1; i++)
+#define PTY_ITERATION	int i; for (i = 0; i < 1; i++)
 #define PTY_NAME_SPRINTF	/* none */
 #define PTY_TTY_NAME_SPRINTF	/* none */
 /* Note that openpty may fork via grantpt on Mac OS X 10.4/Darwin 8.
@@ -148,4 +148,3 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Use the GC_MAKE_GCPROS_NOOPS (see lisp.h) method for marking the stack.  */
 #define GC_MARK_STACK   GC_MAKE_GCPROS_NOOPS
-

src/s/gnu-linux.h

@@ -44,7 +44,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #define UNIX98_PTYS
 
 /* Run only once.  We need a `for'-loop because the code uses `continue'.  */
-#define PTY_ITERATION	for (i = 0; i < 1; i++)
+#define PTY_ITERATION	int i; for (i = 0; i < 1; i++)
 
 #ifdef HAVE_GETPT
 #define PTY_NAME_SPRINTF