1 /* input_file.c - Deal with Input Files -
2 Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001, 2003
3 Free Software Foundation, Inc.
5 This file is part of GAS, the GNU Assembler.
7 GAS is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GAS is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GAS; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Confines all details of reading source bytes to this module.
23 All O/S specific crocks should live here.
24 What we lose in "efficiency" we gain in modularity.
25 Note we don't need to #include the "as.h" file. No common coupling! */
31 #include "input-file.h"
32 #include "safe-ctype.h"
34 static int input_file_get (char *, int);
36 /* This variable is non-zero if the file currently being read should be
37 preprocessed by app. It is zero if the file can be read straight in. */
40 /* This code opens a file, then delivers BUFFER_SIZE character
41 chunks of the file on demand.
42 BUFFER_SIZE is supposed to be a number chosen for speed.
43 The caller only asks once what BUFFER_SIZE is, and asks before
44 the nature of the input files (if any) is known. */
46 #define BUFFER_SIZE (32 * 1024)
48 /* We use static data: the data area is not sharable. */
51 static char *file_name
;
53 /* Struct for saving the state of this module for file includes. */
62 /* These hooks accommodate most operating systems. */
65 input_file_begin (void)
75 /* Return BUFFER_SIZE. */
77 input_file_buffer_size (void)
83 input_file_is_open (void)
85 return f_in
!= (FILE *) 0;
88 /* Push the state of our input, returning a pointer to saved info that
89 can be restored with input_file_pop (). */
92 input_file_push (void)
94 register struct saved_file
*saved
;
96 saved
= (struct saved_file
*) xmalloc (sizeof *saved
);
99 saved
->file_name
= file_name
;
100 saved
->preprocess
= preprocess
;
102 saved
->app_save
= app_push ();
104 /* Initialize for new file. */
107 return (char *) saved
;
111 input_file_pop (char *arg
)
113 register struct saved_file
*saved
= (struct saved_file
*) arg
;
115 input_file_end (); /* Close out old file. */
118 file_name
= saved
->file_name
;
119 preprocess
= saved
->preprocess
;
121 app_pop (saved
->app_save
);
127 input_file_open (char *filename
, /* "" means use stdin. Must not be 0. */
135 assert (filename
!= 0); /* Filename may not be NULL. */
138 f_in
= fopen (filename
, FOPEN_RT
);
139 file_name
= filename
;
143 /* Use stdin for the input file. */
145 /* For error messages. */
146 file_name
= _("{standard input}");
152 if (f_in
== NULL
|| ferror (f_in
))
155 bfd_set_error (bfd_error_system_call
);
157 as_perror (_("Can't open %s for reading"), file_name
);
169 /* Begins with comment, may not want to preprocess. */
173 fgets (buf
, 80, f_in
);
174 if (!strncmp (buf
, "O_APP", 5) && ISSPACE (buf
[5]))
176 if (!strchr (buf
, '\n'))
177 ungetc ('#', f_in
); /* It was longer. */
183 fgets (buf
, 80, f_in
);
184 if (!strncmp (buf
, "PP", 2) && ISSPACE (buf
[2]))
186 if (!strchr (buf
, '\n'))
200 /* Close input file. */
203 input_file_close (void)
205 /* Don't close a null file pointer. */
212 /* This function is passed to do_scrub_chars. */
215 input_file_get (char *buf
, int buflen
)
219 size
= fread (buf
, sizeof (char), buflen
, f_in
);
223 bfd_set_error (bfd_error_system_call
);
225 as_perror (_("Can't read from %s"), file_name
);
231 /* Read a buffer from the input file. */
234 input_file_give_next_buffer (char *where
/* Where to place 1st character of new buffer. */)
236 char *return_value
; /* -> Last char of what we read, + 1. */
239 if (f_in
== (FILE *) 0)
241 /* fflush (stdin); could be done here if you want to synchronise
242 stdin and stdout, for the case where our input file is stdin.
243 Since the assembler shouldn't do any output to stdout, we
244 don't bother to synch output and input. */
246 size
= do_scrub_chars (input_file_get
, where
, BUFFER_SIZE
);
248 size
= fread (where
, sizeof (char), BUFFER_SIZE
, f_in
);
252 bfd_set_error (bfd_error_system_call
);
254 as_perror (_("Can't read from %s"), file_name
);
258 return_value
= where
+ size
;
264 bfd_set_error (bfd_error_system_call
);
266 as_perror (_("Can't close %s"), file_name
);
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