Introduce gdb_argv, a class wrapper for buildargv

This introduces gdb_argv, a class wrapping an "argv" pointer; that is,
a pointer to a NULL-terminated array of char*, where both the array
and each non-NULL element in the array are xmalloc'd.

This patch then changes most users of gdb_buildargv to use gdb_argv
instead.

ChangeLog
2017-08-03  Tom Tromey  <tom@tromey.com>

	* utils.h (struct gdb_argv_deleter): New.
	(gdb_argv): New class.
	* utils.c (gdb_argv::reset): New method.
	* tracepoint.c (delete_trace_variable_command): Use gdb_argv.
	* tracefile.c (tsave_command): Use gdb_argv.
	* top.c (new_ui_command): Use gdb_argv.
	* symmisc.c (maintenance_print_symbols)
	(maintenance_print_msymbols, maintenance_expand_symtabs): Use gdb_argv.
	* symfile.c (symbol_file_command, generic_load)
	(remove_symbol_file_command): Use gdb_argv.
	* stack.c (backtrace_command): Use gdb_argv.
	* source.c (add_path, show_substitute_path_command)
	(unset_substitute_path_command, set_substitute_path_command):
	Use gdb_argv.
	* skip.c (skip_command): Use gdb_argv.  Use gdb_buildargv.
	* ser-mingw.c (pipe_windows_open): Use gdb_argv.
	* remote.c (extended_remote_run, remote_put_command)
	(remote_get_command, remote_delete_command): Use gdb_argv.
	* remote-sim.c (gdbsim_load, gdbsim_create_inferior)
	(gdbsim_open): Use gdb_argv.
	* python/py-cmd.c (gdbpy_string_to_argv): Use gdb_argv.
	* psymtab.c (maintenance_print_psymbols): Use gdb_argv.
	* procfs.c (procfs_info_proc): Use gdb_argv.
	* interps.c (interpreter_exec_cmd): Use gdb_argv.
	* infrun.c (handle_command): Use gdb_argv.
	* inferior.c (add_inferior_command, clone_inferior_command):
	Use gdb_argv.
	* guile/scm-string.c (gdbscm_string_to_argv): Use gdb_argv.
	* exec.c (exec_file_command): Use gdb_argv.
	* cli/cli-cmds.c (alias_command): Use gdb_argv.
	* compile/compile.c (build_argc_argv): Use gdb_argv.

1 files changed, 2 insertions, 11 deletions

diff --git a/gdb/interps.c b/gdb/interps.c
index 4de7c4e8be6..1e59034a5e8 100644
--- a/gdb/interps.c
+++ b/gdb/interps.c
@@ -407,21 +407,14 @@ interpreter_exec_cmd (char *args, int from_tty)
 {
   struct ui_interp_info *ui_interp = get_current_interp_info ();
   struct interp *old_interp, *interp_to_use;
-  char **prules = NULL;
-  char **trule = NULL;
   unsigned int nrules;
   unsigned int i;
-  struct cleanup *cleanup;
 
   if (args == NULL)
     error_no_arg (_("interpreter-exec command"));
 
-  prules = gdb_buildargv (args);
-  cleanup = make_cleanup_freeargv (prules);
-
-  nrules = 0;
-  for (trule = prules; *trule != NULL; trule++)
-    nrules++;
+  gdb_argv prules (args);
+  nrules = prules.count ();
 
   if (nrules < 2)
     error (_("usage: interpreter-exec <interpreter> [ <command> ... ]"));
@@ -446,8 +439,6 @@ interpreter_exec_cmd (char *args, int from_tty)
     }
 
   interp_set (old_interp, 0);
-
-  do_cleanups (cleanup);
 }
 
 /* See interps.h.  */