[PATCH 07/13] input-file: make some file name variables const

[tbsaunde+binutils@tbsaunde.org]

From: Trevor Saunders <tbsaunde+binutils@tbsaunde.org>

gas/ChangeLog:

2016-02-21  Trevor Saunders  <tbsaunde+binutils@tbsaunde.org>

	* input-file.c (file_name): Change type to const char *.
	(saved_file::file_name): Likewise.
	(input_file_open): Change type of argument to const char *.
	* input-file.h (input_file_open): Adjust.
---
 gas/input-file.c | 8 +++++---
 gas/input-file.h | 2 +-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/gas/input-file.c b/gas/input-file.c
index 08ffa46..a3dcd9d 100644
--- a/gas/input-file.c
+++ b/gas/input-file.c
@@ -42,13 +42,13 @@ int preprocess = 0;
 /* We use static data: the data area is not sharable.  */
 
 static FILE *f_in;
-static char *file_name;
+static const char *file_name;
 
 /* Struct for saving the state of this module for file includes.  */
 struct saved_file
   {
     FILE * f_in;
-    char * file_name;
+    const char * file_name;
     int    preprocess;
     char * app_save;
   };
@@ -111,8 +111,10 @@ input_file_pop (char *arg)
   free (arg);
 }
 
+/* Open the specified file, "" means stdin.  Filename must not be null.  */
+
 void
-input_file_open (char *filename, /* "" means use stdin. Must not be 0.  */
+input_file_open (const char *filename,
 		 int pre)
 {
   int c;
diff --git a/gas/input-file.h b/gas/input-file.h
index cedaa9b..3581046 100644
--- a/gas/input-file.h
+++ b/gas/input-file.h
@@ -61,5 +61,5 @@ size_t input_file_buffer_size (void);
 void input_file_begin (void);
 void input_file_close (void);
 void input_file_end (void);
-void input_file_open (char *filename, int pre);
+void input_file_open (const char *filename, int pre);
 void input_file_pop (char *arg);
-- 
2.7.0