[PATCH v2 1/3] Add zero-padded hexadecimal format support for varobj's

[Luis Machado <lgustavo@codesourcery.com>]

This patch changes things so that we can support zero-padded hexadecimal
formats for varobj's. The new type is "zero-hexadecimal" and maps to GDB's 'z'
print format.

Ideally we would share all the formats we currently support with the MI/varobj
layer, but this requires a bit more work. Meanwhile, adding a new mapping seems
to work.

gdb/ChangeLog:

2015-05-07  Luis Machado  <lgustavo@codesourcery.com>

	* gdb/mi/mi-cmd-var.c (mi_parse_format): Handle new "zero-hexadecimal"
	format.
	* gdb/varobj.c (varobj_format_string): Add "zero-hexadecimal" entry.
	(format_code): Add 'z' entry.
	(varobj_set_display_format): Handle FORMAT_ZHEXADECIMAL.
	* gdb/varobj.h (varobj_display_formats) <FORMAT_ZHEXADECIMAL>: New enum
	field.
---
 gdb/mi/mi-cmd-var.c | 4 +++-
 gdb/varobj.c        | 5 +++--
 gdb/varobj.h        | 3 ++-
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/gdb/mi/mi-cmd-var.c b/gdb/mi/mi-cmd-var.c
index ee0bbc6..5554e3c 100644
--- a/gdb/mi/mi-cmd-var.c
+++ b/gdb/mi/mi-cmd-var.c
@@ -233,10 +233,12 @@ mi_parse_format (const char *arg)
 	return FORMAT_HEXADECIMAL;
       else if (strncmp (arg, "octal", len) == 0)
 	return FORMAT_OCTAL;
+      else if (strncmp (arg, "zero-hexadecimal", len) == 0)
+	return FORMAT_ZHEXADECIMAL;
     }
 
   error (_("Must specify the format as: \"natural\", "
-	   "\"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
+	   "\"binary\", \"decimal\", \"hexadecimal\", \"octal\" or \"zero-hexadecimal\""));
 }
 
 void
diff --git a/gdb/varobj.c b/gdb/varobj.c
index b220fd8..2f2939e 100644
--- a/gdb/varobj.c
+++ b/gdb/varobj.c
@@ -50,7 +50,7 @@ show_varobjdebug (struct ui_file *file, int from_tty,
 
 /* String representations of gdb's format codes.  */
 char *varobj_format_string[] =
-  { "natural", "binary", "decimal", "hexadecimal", "octal" };
+  { "natural", "binary", "decimal", "hexadecimal", "octal", "zero-hexadecimal" };
 
 /* True if we want to allow Python-based pretty-printing.  */
 static int pretty_printing = 0;
@@ -214,7 +214,7 @@ static struct varobj *varobj_add_child (struct varobj *var,
 /* Private data */
 
 /* Mappings of varobj_display_formats enums to gdb's format codes.  */
-static int format_code[] = { 0, 't', 'd', 'x', 'o' };
+static int format_code[] = { 0, 't', 'd', 'x', 'o', 'z' };
 
 /* Header of the list of root variable objects.  */
 static struct varobj_root *rootlist;
@@ -583,6 +583,7 @@ varobj_set_display_format (struct varobj *var,
     case FORMAT_DECIMAL:
     case FORMAT_HEXADECIMAL:
     case FORMAT_OCTAL:
+    case FORMAT_ZHEXADECIMAL:
       var->format = format;
       break;
 
diff --git a/gdb/varobj.h b/gdb/varobj.h
index 8860526..179b2a5 100644
--- a/gdb/varobj.h
+++ b/gdb/varobj.h
@@ -28,7 +28,8 @@ enum varobj_display_formats
     FORMAT_BINARY,		/* Binary display                    */
     FORMAT_DECIMAL,		/* Decimal display                   */
     FORMAT_HEXADECIMAL,		/* Hex display                       */
-    FORMAT_OCTAL		/* Octal display                     */
+    FORMAT_OCTAL,		/* Octal display                     */
+    FORMAT_ZHEXADECIMAL		/* Zero padded hexadecimal	     */
   };
 
 enum varobj_type
-- 
1.9.1