[commit/Ada] delete ada-lang.c:extract_string and use target_read_string instead

[Joel Brobecker <brobecker@adacore.com>]

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Just a minor cleanup of ada-lang.c to remove a function that
duplicates another function implemented elsewhere.

2009-04-16  Joel Brobecker  <brobecker@adacore.com>
 
        * ada-lang.c (extract_string): Delete.
        (ada_main_name): Reimplement using target_read_string instead of
        extract_string.

This is exercised everytime we do a "start", which looks for the name
of the main routine.

Tested on x86_64-linux, no regression. Checked in.

-- 
Joel

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commit 04d8d0167590b9132f9a0f1e4c06476dbe892bb2
Author: Joel Brobecker <brobecker@adacore.com>
Date:   Wed Apr 8 14:55:02 2009 -0700

        * ada-lang.c (extract_string): Delete.
        (ada_main_name): Reimplement using target_read_string instead of
        extract_string.

diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 54f2590..814a793 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -679,8 +679,7 @@ char *
 ada_main_name (void)
 {
   struct minimal_symbol *msym;
-  CORE_ADDR main_program_name_addr;
-  static char main_program_name[1024];
+  static char *main_program_name = NULL;
 
   /* For Ada, the name of the main procedure is stored in a specific
      string constant, generated by the binder.  Look for that symbol,
@@ -691,11 +690,19 @@ ada_main_name (void)
 
   if (msym != NULL)
     {
+      CORE_ADDR main_program_name_addr;
+      int err_code;
+
       main_program_name_addr = SYMBOL_VALUE_ADDRESS (msym);
       if (main_program_name_addr == 0)
         error (_("Invalid address for Ada main program name."));
 
-      extract_string (main_program_name_addr, main_program_name);
+      xfree (main_program_name);
+      target_read_string (main_program_name_addr, &main_program_name,
+                          1024, &err_code);
+
+      if (err_code != 0)
+        return NULL;
       return main_program_name;
     }