1 /* input_file.c - Deal with Input Files -
2 Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001,
4 Free Software Foundation, Inc.
6 This file is part of GAS, the GNU Assembler.
8 GAS is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GAS is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GAS; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
23 /* Confines all details of reading source bytes to this module.
24 All O/S specific crocks should live here.
25 What we lose in "efficiency" we gain in modularity.
26 Note we don't need to #include the "as.h" file. No common coupling! */
32 #include "input-file.h"
33 #include "safe-ctype.h"
35 static int input_file_get (char *, int);
37 /* This variable is non-zero if the file currently being read should be
38 preprocessed by app. It is zero if the file can be read straight in. */
41 /* This code opens a file, then delivers BUFFER_SIZE character
42 chunks of the file on demand.
43 BUFFER_SIZE is supposed to be a number chosen for speed.
44 The caller only asks once what BUFFER_SIZE is, and asks before
45 the nature of the input files (if any) is known. */
47 #define BUFFER_SIZE (32 * 1024)
49 /* We use static data: the data area is not sharable. */
52 static char *file_name
;
54 /* Struct for saving the state of this module for file includes. */
63 /* These hooks accommodate most operating systems. */
66 input_file_begin (void)
76 /* Return BUFFER_SIZE. */
78 input_file_buffer_size (void)
83 /* Push the state of our input, returning a pointer to saved info that
84 can be restored with input_file_pop (). */
87 input_file_push (void)
89 register struct saved_file
*saved
;
91 saved
= (struct saved_file
*) xmalloc (sizeof *saved
);
94 saved
->file_name
= file_name
;
95 saved
->preprocess
= preprocess
;
97 saved
->app_save
= app_push ();
99 /* Initialize for new file. */
102 return (char *) saved
;
106 input_file_pop (char *arg
)
108 register struct saved_file
*saved
= (struct saved_file
*) arg
;
110 input_file_end (); /* Close out old file. */
113 file_name
= saved
->file_name
;
114 preprocess
= saved
->preprocess
;
116 app_pop (saved
->app_save
);
122 input_file_open (char *filename
, /* "" means use stdin. Must not be 0. */
130 assert (filename
!= 0); /* Filename may not be NULL. */
133 f_in
= fopen (filename
, FOPEN_RT
);
134 file_name
= filename
;
138 /* Use stdin for the input file. */
140 /* For error messages. */
141 file_name
= _("{standard input}");
146 bfd_set_error (bfd_error_system_call
);
147 as_perror (_("Can't open %s for reading"), file_name
);
155 bfd_set_error (bfd_error_system_call
);
156 as_perror (_("Can't open %s for reading"), file_name
);
165 /* Begins with comment, may not want to preprocess. */
169 fgets (buf
, 80, f_in
);
170 if (!strncmp (buf
, "O_APP", 5) && ISSPACE (buf
[5]))
172 if (!strchr (buf
, '\n'))
173 ungetc ('#', f_in
); /* It was longer. */
179 fgets (buf
, 80, f_in
);
180 if (!strncmp (buf
, "PP", 2) && ISSPACE (buf
[2]))
182 if (!strchr (buf
, '\n'))
196 /* Close input file. */
199 input_file_close (void)
201 /* Don't close a null file pointer. */
208 /* This function is passed to do_scrub_chars. */
211 input_file_get (char *buf
, int buflen
)
215 size
= fread (buf
, sizeof (char), buflen
, f_in
);
218 bfd_set_error (bfd_error_system_call
);
219 as_perror (_("Can't read from %s"), file_name
);
225 /* Read a buffer from the input file. */
228 input_file_give_next_buffer (char *where
/* Where to place 1st character of new buffer. */)
230 char *return_value
; /* -> Last char of what we read, + 1. */
233 if (f_in
== (FILE *) 0)
235 /* fflush (stdin); could be done here if you want to synchronise
236 stdin and stdout, for the case where our input file is stdin.
237 Since the assembler shouldn't do any output to stdout, we
238 don't bother to synch output and input. */
240 size
= do_scrub_chars (input_file_get
, where
, BUFFER_SIZE
);
242 size
= fread (where
, sizeof (char), BUFFER_SIZE
, f_in
);
245 bfd_set_error (bfd_error_system_call
);
246 as_perror (_("Can't read from %s"), file_name
);
250 return_value
= where
+ size
;
255 bfd_set_error (bfd_error_system_call
);
256 as_perror (_("Can't close %s"), file_name
);
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