* ada-lang.c (ada_read_renaming_var_value): Pass const

pointer to expression string to parse_exp_1.
	(create_excep_cond_exprs): Likewise.
	* ax-gdb.c (agent_eval_command_one): Likewise.
	(maint_agent_printf_command): Likewise.
	Constify much of the string handling/parsing.
	* breakpoint.c (set_breakpoint_condition): Pass const
	pointer to expression string to parse_exp_1.
	(update_watchpoint): Likewise.
	(parse_cmd_to_aexpr): Constify string handling.
	Pass const pointer to parse_exp_1.
	(init_breakpoint_sal): Pass const pointer to parse_exp_1.
	(find_condition_and_thread): Likewise.
	Make TOK const.
	(watch_command_1): Make "arg" const.
	Constify string handling.
	Copy the expression string instead of changing the input
	string.
	(update_breakpoint_location): Pass const pointer to
	parse_exp_1.
	* eval.c (parse_and_eval_address): Make "exp" const.
	(parse_to_comma_and_eval): Make "expp" const.
	(parse_and_eval): Make "exp" const.
	* expression.h (parse_expression): Make argument const.
	(parse_exp_1): Make first argument const.
	* findcmd.c (parse_find_args): Treat "args" as const.
	* linespec.c (parse_linespec): Pass const pointer to
	linespec_expression_to_pc.
	(linespec_expression_to_pc): Make "exp_ptr" const.
	* parse.c (parse_exp_1): Make "stringptr" const.
	Make a copy of the expression to pass to parse_exp_in_context until
	this whole interface can be constified.
	(parse_expression): Make "string" const.
	* printcmd.c (ui_printf): Treat "arg" as const.
	Handle const strings.
	* tracepoint.c (validate_actionline): Pass const pointer to
	all calls to parse_exp_1.
	(encode_actions_1): Likewise.
	* value.h (parse_to_comma_and_eval): Make argument const.
	(parse_and_eval_address): Likewise.
	(parse_and_eval): Likewise.
	* varobj.c (varobj_create): Pass const pointer to parse_exp_1.
	(varobj_set_value): Likewise.
	* cli/cli-cmds.c (disassemble_command): Treat "arg" as const and
	constify string handling.
	Pass const pointers to parse_and_eval_address and
	parse_to_comman_and_eval.
	* cli/cli-utils.c (skip_to_space): Rename to ...
	(skip_to_space_const): ... this. Handle const strings.
	* cli/cli-utils.h (skip_to_space): Turn into macro which invokes
	skip_to_space_const.
	(skip_to_space_const): Declare.
	* common/format.c (parse_format_string): Make "arg" const.
	Handle const strings.
	* common/format.h (parse_format_string): Make "arg" const.
	* gdbserver/ax.c (ax_printf): Make "format" const.
	* python/python.c (gdbpy_parse_and_eval): Do not make a copy
	of the expression string.

gdb/cli/cli-cmds.c

@@ -1113,20 +1113,22 @@ disassemble_command (char *arg, int from_tty)
   const char *name;
   CORE_ADDR pc;
   int flags;
+  const char *p;
 
+  p = arg;
   name = NULL;
   flags = 0;
 
-  if (arg && *arg == '/')
+  if (p && *p == '/')
     {
-      ++arg;
+      ++p;
 
-      if (*arg == '\0')
+      if (*p == '\0')
 	error (_("Missing modifier."));
 
-      while (*arg && ! isspace (*arg))
+      while (*p && ! isspace (*p))
 	{
-	  switch (*arg++)
+	  switch (*p++)
 	    {
 	    case 'm':
 	      flags |= DISASSEMBLY_SOURCE;
@@ -1139,20 +1141,20 @@ disassemble_command (char *arg, int from_tty)
 	    }
 	}
 
-      arg = skip_spaces (arg);
+      p = skip_spaces_const (p);
     }
 
-  if (! arg || ! *arg)
+  if (! p || ! *p)
     {
       flags |= DISASSEMBLY_OMIT_FNAME;
       disassemble_current_function (flags);
       return;
     }
 
-  pc = value_as_address (parse_to_comma_and_eval (&arg));
-  if (arg[0] == ',')
-    ++arg;
-  if (arg[0] == '\0')
+  pc = value_as_address (parse_to_comma_and_eval (&p));
+  if (p[0] == ',')
+    ++p;
+  if (p[0] == '\0')
     {
       /* One argument.  */
       if (find_pc_partial_function (pc, &name, &low, &high) == 0)
@@ -1172,13 +1174,13 @@ disassemble_command (char *arg, int from_tty)
       /* Two arguments.  */
       int incl_flag = 0;
       low = pc;
-      arg = skip_spaces (arg);
-      if (arg[0] == '+')
+      p = skip_spaces_const (p);
+      if (p[0] == '+')
 	{
-	  ++arg;
+	  ++p;
 	  incl_flag = 1;
 	}
-      high = parse_and_eval_address (arg);
+      high = parse_and_eval_address (p);
       if (incl_flag)
 	high += low;
     }

gdb/cli/cli-utils.c

@@ -237,8 +237,8 @@ skip_spaces_const (const char *chp)
 
 /* See documentation in cli-utils.h.  */
 
-char *
-skip_to_space (char *chp)
+const char *
+skip_to_space_const (const char *chp)
 {
   if (chp == NULL)
     return NULL;

gdb/cli/cli-utils.h

@@ -101,7 +101,11 @@ extern const char *skip_spaces_const (const char *inp);
 /* Skip leading non-whitespace characters in INP, returning an updated
    pointer.  If INP is NULL, return NULL.  */
 
-extern char *skip_to_space (char *inp);
+#define skip_to_space(INP) ((char *) skip_to_space_const (INP))
+
+/* A const-correct version of the above.  */
+
+extern const char *skip_to_space_const (const char *inp);
 
 /* Reverse S to the last non-whitespace character without skipping past
    START.  */