| 1 | /* input_file.c - Deal with Input Files -
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| 2 | Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001
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| 3 | Free Software Foundation, Inc.
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| 4 |
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| 5 | This file is part of GAS, the GNU Assembler.
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| 6 |
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| 7 | GAS is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2, or (at your option)
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| 10 | any later version.
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| 11 |
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| 12 | GAS is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with GAS; see the file COPYING. If not, write to the Free
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| 19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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| 20 | 02111-1307, USA. */
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| 21 |
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| 22 | /* Confines all details of reading source bytes to this module.
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| 23 | All O/S specific crocks should live here.
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| 24 | What we lose in "efficiency" we gain in modularity.
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| 25 | Note we don't need to #include the "as.h" file. No common coupling! */
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| 26 |
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| 27 | #include <stdio.h>
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| 28 | #include <string.h>
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| 29 | #include "as.h"
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| 30 | #include "input-file.h"
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| 31 | #include "safe-ctype.h"
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| 32 |
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| 33 | static int input_file_get PARAMS ((char *, int));
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| 34 |
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| 35 | /* This variable is non-zero if the file currently being read should be
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| 36 | preprocessed by app. It is zero if the file can be read straight in. */
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| 37 | int preprocess = 0;
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| 38 |
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| 39 | /* This code opens a file, then delivers BUFFER_SIZE character
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| 40 | chunks of the file on demand.
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| 41 | BUFFER_SIZE is supposed to be a number chosen for speed.
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| 42 | The caller only asks once what BUFFER_SIZE is, and asks before
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| 43 | the nature of the input files (if any) is known. */
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| 44 |
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| 45 | #define BUFFER_SIZE (32 * 1024)
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| 46 |
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| 47 | /* We use static data: the data area is not sharable. */
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| 48 |
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| 49 | static FILE *f_in;
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| 50 | static char *file_name;
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| 51 |
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| 52 | /* Struct for saving the state of this module for file includes. */
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| 53 | struct saved_file
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| 54 | {
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| 55 | FILE * f_in;
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| 56 | char * file_name;
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| 57 | int preprocess;
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| 58 | char * app_save;
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| 59 | };
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| 60 | |
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| 61 |
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| 62 | /* These hooks accomodate most operating systems. */
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| 63 |
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| 64 | void
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| 65 | input_file_begin ()
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