[RFC 9/9] update rsp-low comments

[Tom Tromey <tromey@redhat.com>]

This updates all the comments in rsp-low.[ch], now that the
unification has been completed.

2014-01-20  Tom Tromey  <tromey@redhat.com>

	* common/rsp-low.c: Update comments.
	* common/rsp-low.h: Update comments.
---
 gdb/ChangeLog        |  5 +++++
 gdb/common/rsp-low.c | 18 +++++++++++++++++-
 gdb/common/rsp-low.h | 21 +++++++++++++++++++++
 3 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/gdb/common/rsp-low.c b/gdb/common/rsp-low.c
index d7a1280..d085bd7 100644
--- a/gdb/common/rsp-low.c
+++ b/gdb/common/rsp-low.c
@@ -27,7 +27,7 @@
 
 #include "rsp-low.h"
 
-/* Convert hex digit A to a number.  */
+/* See rsp-low.h.  */
 
 int
 fromhex (int a)
@@ -42,6 +42,8 @@ fromhex (int a)
     error (_("Reply contains invalid hex digit %d"), a);
 }
 
+/* See rsp-low.h.  */
+
 int
 tohex (int nib)
 {
@@ -76,6 +78,8 @@ ishex (int ch, int *val)
   return 0;
 }
 
+/* See rsp-low.h.  */
+
 char *
 pack_nibble (char *buf, int nibble)
 {
@@ -83,6 +87,8 @@ pack_nibble (char *buf, int nibble)
   return buf;
 }
 
+/* See rsp-low.h.  */
+
 char *
 pack_hex_byte (char *pkt, int byte)
 {
@@ -91,6 +97,8 @@ pack_hex_byte (char *pkt, int byte)
   return pkt;
 }
 
+/* See rsp-low.h.  */
+
 char *
 unpack_varlen_hex (char *buff,	/* packet to parse */
 		   ULONGEST *result)
@@ -108,6 +116,8 @@ unpack_varlen_hex (char *buff,	/* packet to parse */
   return buff;
 }
 
+/* See rsp-low.h.  */
+
 int
 hex2bin (const char *hex, gdb_byte *bin, int count)
 {
@@ -127,6 +137,8 @@ hex2bin (const char *hex, gdb_byte *bin, int count)
   return i;
 }
 
+/* See rsp-low.h.  */
+
 int
 bin2hex (const gdb_byte *bin, char *hex, int count)
 {
@@ -141,6 +153,8 @@ bin2hex (const gdb_byte *bin, char *hex, int count)
   return i;
 }
 
+/* See rsp-low.h.  */
+
 int
 remote_escape_output (const gdb_byte *buffer, int len,
 		      gdb_byte *out_buf, int *out_len,
@@ -173,6 +187,8 @@ remote_escape_output (const gdb_byte *buffer, int len,
   return output_index;
 }
 
+/* See rsp-low.h.  */
+
 int
 remote_unescape_input (const gdb_byte *buffer, int len,
 		       gdb_byte *out_buf, int out_maxlen)
diff --git a/gdb/common/rsp-low.h b/gdb/common/rsp-low.h
index 611dba3..71d9dbc 100644
--- a/gdb/common/rsp-low.h
+++ b/gdb/common/rsp-low.h
@@ -28,14 +28,35 @@ extern int fromhex (int a);
 
 extern int tohex (int nib);
 
+/* Write a character representing the low order four bits of NIBBLE in
+   hex to *BUF.  Returns BUF+1.  */
+
 extern char *pack_nibble (char *buf, int nibble);
 
+/* Write the low byte of BYTE in hex to *BUF.  Returns BUF+2.  */
+
 extern char *pack_hex_byte (char *pkt, int byte);
 
+/* Read hex digits from BUFF and convert to a number, which is stored
+   in RESULT.  Reads until a non-hex digit is seen.  Returns a pointer
+   to the terminating character.  */
+
 extern char *unpack_varlen_hex (char *buff, ULONGEST *result);
 
+/* HEX is a string of characters representing hexadecimal digits.
+   Convert pairs of hex digits to bytes and store sequentially into
+   BIN.  COUNT is the maximum number of characters to convert.  This
+   will convert fewer characters if the number of hex characters
+   actually seen is odd, or if HEX terminates before COUNT characters.
+   Returns the number of characters actually converted.  */
+
 extern int hex2bin (const char *hex, gdb_byte *bin, int count);
 
+/* Convert some bytes to a hexadecimal representation.  BIN holds the
+   bytes to convert.  COUNT says how many bytes to convert.  The
+   resulting characters are stored in HEX, followed by a NUL
+   character.  Returns the number of bytes actually converted.  */
+
 extern int bin2hex (const gdb_byte *bin, char *hex, int count);
 
 /* Convert BUFFER, binary data at least LEN bytes long, into escaped
-- 
1.8.1.4