Add mi_getopt_allow_unknown

This patch is to add a new function mi_getopt_allow_unknown, which
returns -1 silently (without throwing error) when unknown option is
met, and use this function to parse options for command
'-stack-list-arguments'.

gdb/
	* mi/mi-cmd-stack.c (parse_no_frames_option): Remove.
	(mi_cmd_stack_list_args): Use mi_getopt_silent to handle
	options.
	* mi/mi-getopt.c (mi_getopt): Remove.
	(mi_getopt_1): Renamed from mi_getopt.  Add one parameter
	'error_on_unknown'.
	(mi_getopt): Call mi_getopt_1.
	(mi_getopt_silent): New.
	* mi/mi-getopt.h (mi_getopt_silent): Declare.

1 files changed, 29 insertions, 6 deletions

diff --git a/gdb/mi/mi-getopt.c b/gdb/mi/mi-getopt.c
index a1e2ccc..f207249 100644
--- a/gdb/mi/mi-getopt.c
+++ b/gdb/mi/mi-getopt.c
@@ -21,11 +21,14 @@
 #include "mi-getopt.h"
 #include "gdb_string.h"
 
-int
-mi_getopt (const char *prefix,
-	   int argc, char **argv,
-	   const struct mi_opt *opts,
-	   int *oind, char **oarg)
+/* See comments about mi_getopt and mi_getopt_silent in mi-getopt.h.
+   When there is an unknown option, if ERROR_ON_UNKNOWN is true,
+   throw an error, otherwise return -1.  */
+
+static int
+mi_getopt_1 (const char *prefix, int argc, char **argv,
+	     const struct mi_opt *opts, int *oind, char **oarg,
+	     int error_on_unknown)
 {
   char *arg;
   const struct mi_opt *opt;
@@ -71,7 +74,27 @@ mi_getopt (const char *prefix,
 	  return opt->index;
 	}
     }
-  error (_("%s: Unknown option ``%s''"), prefix, arg + 1);
+
+  if (error_on_unknown)
+    error (_("%s: Unknown option ``%s''"), prefix, arg + 1);
+  else
+    return -1;
+}
+
+int
+mi_getopt (const char *prefix,
+	   int argc, char **argv,
+	   const struct mi_opt *opts,
+	   int *oind, char **oarg)
+{
+  return mi_getopt_1 (prefix, argc, argv, opts, oind, oarg, 1);
+}
+
+int
+mi_getopt_allow_unknown (const char *prefix, int argc, char **argv,
+			 const struct mi_opt *opts, int *oind, char **oarg)
+{
+  return mi_getopt_1 (prefix, argc, argv, opts, oind, oarg, 0);
 }
 
 int