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New function null_stream

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This patch adds a new function null_stream, which returns a null
stream.  The null stream can be used in multiple places.  It is
used in gdb_insn_length, and the following patches will use it too.

gdb:

2017-01-26  Yao Qi  <yao.qi@linaro.org>

	* disasm.c (do_ui_file_delete): Delete.
	(gdb_insn_length): Move code creating stream to ...
	* utils.c (null_stream): ... here.  New function.
	* utils.h (null_stream): Declare.
This commit is contained in:
Yao Qi
2017-01-26 14:29:19 +00:00
parent 8e87a59348
commit 80d758749a
4 changed files with 26 additions and 16 deletions
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3
gdb/utils.h
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@@ -189,6 +189,9 @@ extern struct ui_file *gdb_stdtarg;
extern struct ui_file *gdb_stdtargerr;
extern struct ui_file *gdb_stdtargin;
/* Return a null stream. */
extern struct ui_file *null_stream (void);
/* Set the screen dimensions to WIDTH and HEIGHT. */
extern void set_screen_width_and_height (int width, int height);