1 /* input_file.c - Deal with Input Files -
2 Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001,
3 2002, 2003, 2005, 2006, 2007
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 3, 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! */
29 #include "input-file.h"
30 #include "safe-ctype.h"
32 static int input_file_get (char *, int);
34 /* This variable is non-zero if the file currently being read should be
35 preprocessed by app. It is zero if the file can be read straight in. */
38 /* This code opens a file, then delivers BUFFER_SIZE character
39 chunks of the file on demand.
40 BUFFER_SIZE is supposed to be a number chosen for speed.
41 The caller only asks once what BUFFER_SIZE is, and asks before
42 the nature of the input files (if any) is known. */
44 #define BUFFER_SIZE (32 * 1024)
46 /* We use static data: the data area is not sharable. */
49 static char *file_name
;
51 /* Struct for saving the state of this module for file includes. */
60 /* These hooks accommodate most operating systems. */
63 input_file_begin (void)
73 /* Return BUFFER_SIZE. */
75 input_file_buffer_size (void)
80 /* Push the state of our input, returning a pointer to saved info that
81 can be restored with input_file_pop (). */
84 input_file_push (void)
86 register struct saved_file
*saved
;
88 saved
= (struct saved_file
*) xmalloc (sizeof *saved
);
91 saved
->file_name
= file_name
;
92 saved
->preprocess
= preprocess
;
94 saved
->app_save
= app_push ();
96 /* Initialize for new file. */
99 return (char *) saved
;
103 input_file_pop (char *arg
)
105 register struct saved_file
*saved
= (struct saved_file
*) arg
;
107 input_file_end (); /* Close out old file. */
110 file_name
= saved
->file_name
;
111 preprocess
= saved
->preprocess
;
113 app_pop (saved
->app_save
);
119 input_file_open (char *filename
, /* "" means use stdin. Must not be 0. */
127 assert (filename
!= 0); /* Filename may not be NULL. */
130 f_in
= fopen (filename
, FOPEN_RT
);
131 file_name
= filename
;
135 /* Use stdin for the input file. */
137 /* For error messages. */
138 file_name
= _("{standard input}");
143 as_bad (_("can't open %s for reading: %s"),
144 file_name
, xstrerror (errno
));
152 as_bad (_("can't read from %s: %s"),
153 file_name
, xstrerror (errno
));
162 /* Begins with comment, may not want to preprocess. */
166 if (fgets (buf
, sizeof (buf
), f_in
)
167 && !strncmp (buf
, "O_APP", 5) && ISSPACE (buf
[5]))
169 if (!strchr (buf
, '\n'))
170 ungetc ('#', f_in
); /* It was longer. */
176 if (fgets (buf
, sizeof (buf
), f_in
)
177 && !strncmp (buf
, "PP", 2) && ISSPACE (buf
[2]))
179 if (!strchr (buf
, '\n'))
193 /* Close input file. */
196 input_file_close (void)
198 /* Don't close a null file pointer. */
205 /* This function is passed to do_scrub_chars. */
208 input_file_get (char *buf
, int buflen
)
212 size
= fread (buf
, sizeof (char), buflen
, f_in
);
215 as_bad (_("can't read from %s: %s"), file_name
, xstrerror (errno
));
221 /* Read a buffer from the input file. */
224 input_file_give_next_buffer (char *where
/* Where to place 1st character of new buffer. */)
226 char *return_value
; /* -> Last char of what we read, + 1. */
229 if (f_in
== (FILE *) 0)
231 /* fflush (stdin); could be done here if you want to synchronise
232 stdin and stdout, for the case where our input file is stdin.
233 Since the assembler shouldn't do any output to stdout, we
234 don't bother to synch output and input. */
236 size
= do_scrub_chars (input_file_get
, where
, BUFFER_SIZE
);
238 size
= fread (where
, sizeof (char), BUFFER_SIZE
, f_in
);
241 as_bad (_("can't read from %s: %s"), file_name
, xstrerror (errno
));
245 return_value
= where
+ size
;
249 as_warn (_("can't close %s: %s"), file_name
, xstrerror (errno
));
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