Constify some commands in record.c

gdb/ChangeLog
2017-09-27  Tom Tromey  <tom@tromey.com>

	* record.c (cmd_record_delete, cmd_record_stop, cmd_record_save)
	(cmd_record_goto_begin, cmd_record_goto_end, get_insn_number)
	(get_context_size, no_chunk, get_insn_history_modifiers)
	(cmd_record_insn_history, get_call_history_modifiers)
	(cmd_record_call_history): Constify.

gdb/ChangeLog

@@ -1,3 +1,11 @@
+2017-09-27  Tom Tromey  <tom@tromey.com>
+
+	* record.c (cmd_record_delete, cmd_record_stop, cmd_record_save)
+	(cmd_record_goto_begin, cmd_record_goto_end, get_insn_number)
+	(get_context_size, no_chunk, get_insn_history_modifiers)
+	(cmd_record_insn_history, get_call_history_modifiers)
+	(cmd_record_call_history): Constify.
+
 2017-09-27  Tom Tromey  <tom@tromey.com>
 
 	* source.c (show_substitute_path_command)

gdb/record.c

@@ -272,7 +272,7 @@ cmd_record_start (char *args, int from_tty)
    of replay until the end.  */
 
 static void
-cmd_record_delete (char *args, int from_tty)
+cmd_record_delete (const char *args, int from_tty)
 {
   require_record_target ();
 
@@ -298,7 +298,7 @@ cmd_record_delete (char *args, int from_tty)
 /* Implement the "stoprecord" or "record stop" command.  */
 
 static void
-cmd_record_stop (char *args, int from_tty)
+cmd_record_stop (const char *args, int from_tty)
 {
   struct target_ops *t;
 
@@ -352,9 +352,10 @@ info_record_command (char *args, int from_tty)
 /* The "record save" command.  */
 
 static void
-cmd_record_save (char *args, int from_tty)
+cmd_record_save (const char *args, int from_tty)
 {
-  char *recfilename, recfilename_buffer[40];
+  const char *recfilename;
+  char recfilename_buffer[40];
 
   require_record_target ();
 
@@ -401,7 +402,7 @@ cmd_record_goto (char *arg, int from_tty)
 /* The "record goto begin" command.  */
 
 static void
-cmd_record_goto_begin (char *arg, int from_tty)
+cmd_record_goto_begin (const char *arg, int from_tty)
 {
   if (arg != NULL && *arg != '\0')
     error (_("Junk after argument: %s."), arg);
@@ -413,7 +414,7 @@ cmd_record_goto_begin (char *arg, int from_tty)
 /* The "record goto end" command.  */
 
 static void
-cmd_record_goto_end (char *arg, int from_tty)
+cmd_record_goto_end (const char *arg, int from_tty)
 {
   if (arg != NULL && *arg != '\0')
     error (_("Junk after argument: %s."), arg);
@@ -425,7 +426,7 @@ cmd_record_goto_end (char *arg, int from_tty)
 /* Read an instruction number from an argument string.  */
 
 static ULONGEST
-get_insn_number (char **arg)
+get_insn_number (const char **arg)
 {
   ULONGEST number;
   const char *begin, *end, *pos;
@@ -446,9 +447,10 @@ get_insn_number (char **arg)
 /* Read a context size from an argument string.  */
 
 static int
-get_context_size (char **arg)
+get_context_size (const char **arg)
 {
-  char *pos;
+  const char *pos;
+  char *end;
   int number;
 
   pos = skip_spaces (*arg);
@@ -456,13 +458,15 @@ get_context_size (char **arg)
   if (!isdigit (*pos))
     error (_("Expected positive number, got: %s."), pos);
 
-  return strtol (pos, arg, 10);
+  long result = strtol (pos, &end, 10);
+  *arg = end;
+  return result;
 }
 
 /* Complain about junk at the end of an argument string.  */
 
 static void
-no_chunk (char *arg)
+no_chunk (const char *arg)
 {
   if (*arg != 0)
     error (_("Junk after argument: %s."), arg);
@@ -471,10 +475,10 @@ no_chunk (char *arg)
 /* Read instruction-history modifiers from an argument string.  */
 
 static gdb_disassembly_flags
-get_insn_history_modifiers (char **arg)
+get_insn_history_modifiers (const char **arg)
 {
   gdb_disassembly_flags modifiers;
-  char *args;
+  const char *args;
 
   modifiers = 0;
   args = *arg;
@@ -549,7 +553,7 @@ command_size_to_target_size (unsigned int size)
 /* The "record instruction-history" command.  */
 
 static void
-cmd_record_insn_history (char *arg, int from_tty)
+cmd_record_insn_history (const char *arg, int from_tty)
 {
   require_record_target ();
 
@@ -612,10 +616,10 @@ cmd_record_insn_history (char *arg, int from_tty)
 /* Read function-call-history modifiers from an argument string.  */
 
 static int
-get_call_history_modifiers (char **arg)
+get_call_history_modifiers (const char **arg)
 {
   int modifiers;
-  char *args;
+  const char *args;
 
   modifiers = 0;
   args = *arg;
@@ -666,7 +670,7 @@ get_call_history_modifiers (char **arg)
 /* The "record function-call-history" command.  */
 
 static void
-cmd_record_call_history (char *arg, int from_tty)
+cmd_record_call_history (const char *arg, int from_tty)
 {
   int flags, size;