[PATCH 13/26] serial_write: change prototype to take a void-pointer buffer.

[Pedro Alves <palves@redhat.com>]

While remote.c works with "char *" buffers most of the time, other
remote targets have binary-ish-er protocols, and choose to use
"unsigned char" throughout, like e.g., remote-mips.c or
remote-m32r-sdi.c.  That results in -Wpointer-sign warnings in those
targets, unless we add casts in calls to serial_write.  Since
serial_write is only concerned about sending raw host bytes out, and
serial_ops->write_prim already works with "void *"/"size_t", a similar
interface to the "write" or "send" system calls, I find it natural to
change serial_write's prototype accordingly, avoiding the need for
casts.

Tested on x86_64 Fedora 17, and also by building a x86_64-mingw32
-hosted gdb.  I don't have a set up for testing DJGPP/go32.

gdb/
2013-04-11  Pedro Alves  <palves@redhat.com>

	* ser-base.c (ser_base_write): Change prototype -- take 'void *'
	buffer and size_t size.  Adjust.
	* ser-base.h (ser_base_write): Adjust.
	* ser-go32.c (dos_write): Change prototype -- take 'void *'
	buffer and size_t size.  Adjust.
	* serial.c (serial_write): Likewise.
	* serial.h (serial_write): Adjust.
	(struct serial_ops) <write>: Change prototype -- take 'void *'
	buffer and size_t size.  Adjust.
---
 gdb/ser-base.c |   11 ++++++-----
 gdb/ser-base.h |    2 +-
 gdb/ser-go32.c |   13 +++++++------
 gdb/serial.c   |   16 +++++++++-------
 gdb/serial.h   |    6 +++---
 5 files changed, 26 insertions(+), 22 deletions(-)

diff --git a/gdb/ser-base.c b/gdb/ser-base.c
index c602650..e471247 100644
--- a/gdb/ser-base.c
+++ b/gdb/ser-base.c
@@ -440,18 +440,19 @@ ser_base_readchar (struct serial *scb, int timeout)
 }
 
 int
-ser_base_write (struct serial *scb, const char *str, int len)
+ser_base_write (struct serial *scb, const void *buf, size_t count)
 {
+  const char *ucbuf = buf;
   int cc;
 
-  while (len > 0)
+  while (count > 0)
     {
-      cc = scb->ops->write_prim (scb, str, len); 
+      cc = scb->ops->write_prim (scb, ucbuf, count);
 
       if (cc < 0)
 	return 1;
-      len -= cc;
-      str += cc;
+      count -= cc;
+      ucbuf += cc;
     }
   return 0;
 }
diff --git a/gdb/ser-base.h b/gdb/ser-base.h
index 175bf20..e5fe9e1 100644
--- a/gdb/ser-base.h
+++ b/gdb/ser-base.h
@@ -45,7 +45,7 @@ extern int ser_base_setbaudrate (struct serial *scb, int rate);
 extern int ser_base_setstopbits (struct serial *scb, int rate);
 extern int ser_base_drain_output (struct serial *scb);
 
-extern int ser_base_write (struct serial *scb, const char *str, int len);
+extern int ser_base_write (struct serial *scb, const void *buf, size_t count);
 
 extern void ser_base_async (struct serial *scb, int async_p);
 extern int ser_base_readchar (struct serial *scb, int timeout);
diff --git a/gdb/ser-go32.c b/gdb/ser-go32.c
index 7d76720..76a2f4f 100644
--- a/gdb/ser-go32.c
+++ b/gdb/ser-go32.c
@@ -230,7 +230,7 @@ static int dos_open (struct serial *scb, const char *name);
 static void dos_raw (struct serial *scb);
 static int dos_readchar (struct serial *scb, int timeout);
 static int dos_setbaudrate (struct serial *scb, int rate);
-static int dos_write (struct serial *scb, const char *str, int len);
+static int dos_write (struct serial *scb, const void *buf, int count);
 static void dos_close (struct serial *scb);
 static serial_ttystate dos_get_tty_state (struct serial *scb);
 static int dos_set_tty_state (struct serial *scb, serial_ttystate state);
@@ -787,26 +787,27 @@ dos_setstopbits (struct serial *scb, int num)
 }
 
 static int
-dos_write (struct serial *scb, const char *str, int len)
+dos_write (struct serial *scb, const void *buf, int count)
 {
   volatile struct dos_ttystate *port = &ports[scb->fd];
   int fifosize = port->fifo ? 16 : 1;
   long then;
   int cnt;
+  const char *str = buf;
 
-  while (len > 0)
+  while (count > 0)
     {
       /* Send the data, fifosize bytes at a time.  */
-      cnt = fifosize > len ? len : fifosize;
+      cnt = fifosize > count ? count : fifosize;
       port->txbusy = 1;
       /* Francisco Pastor <fpastor.etra-id@etra.es> says OUTSB messes
 	 up the communications with UARTs with FIFOs.  */
 #ifdef UART_FIFO_WORKS
       outportsb (port->base + com_data, str, cnt);
       str += cnt;
-      len -= cnt;
+      count -= cnt;
 #else
-      for ( ; cnt > 0; cnt--, len--)
+      for ( ; cnt > 0; cnt--, count--)
 	outportb (port->base + com_data, *str++);
 #endif
 #ifdef DOS_STATS
diff --git a/gdb/serial.c b/gdb/serial.c
index 3202b0f..ee3f1ea 100644
--- a/gdb/serial.c
+++ b/gdb/serial.c
@@ -398,14 +398,15 @@ serial_readchar (struct serial *scb, int timeout)
 }
 
 int
-serial_write (struct serial *scb, const char *str, int len)
+serial_write (struct serial *scb, const void *buf, size_t count)
 {
   if (serial_logfp != NULL)
     {
-      int count;
+      const char *str = buf;
+      size_t c;
 
-      for (count = 0; count < len; count++)
-	serial_logchar (serial_logfp, 'w', str[count] & 0xff, 0);
+      for (c = 0; c < count; c++)
+	serial_logchar (serial_logfp, 'w', str[c] & 0xff, 0);
 
       /* Make sure that the log file is as up-to-date as possible,
          in case we are getting ready to dump core or something.  */
@@ -413,9 +414,10 @@ serial_write (struct serial *scb, const char *str, int len)
     }
   if (serial_debug_p (scb))
     {
-      int count;
+      const char *str = buf;
+      size_t c;
 
-      for (count = 0; count < len; count++)
+      for (c = 0; c < count; c++)
 	{
 	  fprintf_unfiltered (gdb_stdlog, "[");
 	  serial_logchar (gdb_stdlog, 'w', str[count] & 0xff, 0);
@@ -424,7 +426,7 @@ serial_write (struct serial *scb, const char *str, int len)
       gdb_flush (gdb_stdlog);
     }
 
-  return (scb->ops->write (scb, str, len));
+  return (scb->ops->write (scb, buf, count));
 }
 
 void
diff --git a/gdb/serial.h b/gdb/serial.h
index a91c8b8..7a97e28 100644
--- a/gdb/serial.h
+++ b/gdb/serial.h
@@ -104,10 +104,10 @@ enum serial_rc {
 
 extern int serial_readchar (struct serial *scb, int timeout);
 
-/* Write LEN chars from STRING to the port SCB.  Returns 0 for
+/* Write COUNT bytes from BUF to the port SCB.  Returns 0 for
    success, non-zero for failure.  */
 
-extern int serial_write (struct serial *scb, const char *str, int len);
+extern int serial_write (struct serial *scb, const void *buf, size_t count);
 
 /* Write a printf style string onto the serial port.  */
 
@@ -256,7 +256,7 @@ struct serial_ops
     void (*close) (struct serial *);
     int (*fdopen) (struct serial *, int fd);
     int (*readchar) (struct serial *, int timeout);
-    int (*write) (struct serial *, const char *str, int len);
+    int (*write) (struct serial *, const void *buf, size_t count);
     /* Discard pending output */
     int (*flush_output) (struct serial *);
     /* Discard pending input */