1 /* input_file.c - Deal with Input Files -
2 Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001
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! */
30 #include "input-file.h"
31 #include "safe-ctype.h"
33 static int input_file_get
PARAMS ((char *, int));
35 /* This variable is non-zero if the file currently being read should be
36 preprocessed by app. It is zero if the file can be read straight in. */
39 /* This code opens a file, then delivers BUFFER_SIZE character
40 chunks of the file on demand.
41 BUFFER_SIZE is supposed to be a number chosen for speed.
42 The caller only asks once what BUFFER_SIZE is, and asks before
43 the nature of the input files (if any) is known. */
45 #define BUFFER_SIZE (32 * 1024)
47 /* We use static data: the data area is not sharable. */
50 static char *file_name
;
52 /* Struct for saving the state of this module for file includes. */
61 /* These hooks accomodate most operating systems. */
74 /* Return BUFFER_SIZE. */
76 input_file_buffer_size ()
84 return f_in
!= (FILE *) 0;
87 /* Push the state of our input, returning a pointer to saved info that
88 can be restored with input_file_pop (). */
93 register struct saved_file
*saved
;
95 saved
= (struct saved_file
*) xmalloc (sizeof *saved
);
98 saved
->file_name
= file_name
;
99 saved
->preprocess
= preprocess
;
101 saved
->app_save
= app_push ();
103 /* Initialize for new file. */
106 return (char *) saved
;
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 (filename
, pre
)
128 char *filename
; /* "" means use stdin. Must not be 0. */
136 assert (filename
!= 0); /* Filename may not be NULL. */
138 { /* We have a file name. Suck it and see. */
139 f_in
= fopen (filename
, FOPEN_RT
);
140 file_name
= filename
;
143 { /* use stdin for the input file. */
145 file_name
= _("{standard input}"); /* For error messages. */
147 if (f_in
== (FILE *) 0)
149 as_bad (_("can't open %s for reading"), file_name
);
150 as_perror ("%s", file_name
);
157 /* Begins with comment, may not want to preprocess. */
161 fgets (buf
, 80, f_in
);
162 if (!strncmp (buf
, "O_APP", 5) && ISSPACE (buf
[5]))
164 if (!strchr (buf
, '\n'))
165 ungetc ('#', f_in
); /* It was longer. */
171 fgets (buf
, 80, f_in
);
172 if (!strncmp (buf
, "PP", 2) && ISSPACE (buf
[2]))
174 if (!strchr (buf
, '\n'))
188 /* Close input file. */
193 /* Don't close a null file pointer. */
200 /* This function is passed to do_scrub_chars. */
203 input_file_get (buf
, buflen
)
209 size
= fread (buf
, sizeof (char), buflen
, f_in
);
212 as_perror (_("Can't read from %s"), file_name
);
218 /* Read a buffer from the input file. */
221 input_file_give_next_buffer (where
)
222 char *where
; /* Where to place 1st character of new buffer. */
224 char *return_value
; /* -> Last char of what we read, + 1. */
227 if (f_in
== (FILE *) 0)
229 /* fflush (stdin); could be done here if you want to synchronise
230 stdin and stdout, for the case where our input file is stdin.
231 Since the assembler shouldn't do any output to stdout, we
232 don't bother to synch output and input. */
234 size
= do_scrub_chars (input_file_get
, where
, BUFFER_SIZE
);
236 size
= fread (where
, sizeof (char), BUFFER_SIZE
, f_in
);
239 as_perror (_("Can't read from %s"), file_name
);
243 return_value
= where
+ size
;
247 as_perror (_("Can't close %s"), file_name
);
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