1999-05-03 15:29:11 +08:00
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/* input_file.c - Deal with Input Files -
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2003-11-07 20:19:34 +08:00
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Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001, 2003
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1999-06-03 08:24:14 +08:00
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Free Software Foundation, Inc.
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1999-05-03 15:29:11 +08:00
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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1999-06-03 08:24:14 +08:00
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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1999-05-03 15:29:11 +08:00
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2001-07-10 17:45:50 +08:00
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/* Confines all details of reading source bytes to this module.
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All O/S specific crocks should live here.
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What we lose in "efficiency" we gain in modularity.
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Note we don't need to #include the "as.h" file. No common coupling! */
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1999-05-03 15:29:11 +08:00
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#include <stdio.h>
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#include <string.h>
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2003-11-07 20:19:34 +08:00
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#include <sys/stat.h>
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1999-05-03 15:29:11 +08:00
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#include "as.h"
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#include "input-file.h"
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2001-10-11 15:17:47 +08:00
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#include "safe-ctype.h"
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1999-05-03 15:29:11 +08:00
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1999-06-03 08:24:14 +08:00
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static int input_file_get PARAMS ((char *, int));
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1999-05-03 15:29:11 +08:00
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/* This variable is non-zero if the file currently being read should be
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2001-07-10 17:45:50 +08:00
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preprocessed by app. It is zero if the file can be read straight in. */
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1999-05-03 15:29:11 +08:00
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int preprocess = 0;
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2001-07-10 17:45:50 +08:00
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/* This code opens a file, then delivers BUFFER_SIZE character
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chunks of the file on demand.
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BUFFER_SIZE is supposed to be a number chosen for speed.
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The caller only asks once what BUFFER_SIZE is, and asks before
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the nature of the input files (if any) is known. */
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1999-05-03 15:29:11 +08:00
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#define BUFFER_SIZE (32 * 1024)
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2001-07-10 17:45:50 +08:00
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/* We use static data: the data area is not sharable. */
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1999-05-03 15:29:11 +08:00
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static FILE *f_in;
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static char *file_name;
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/* Struct for saving the state of this module for file includes. */
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2001-07-10 17:45:50 +08:00
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struct saved_file
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{
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FILE * f_in;
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char * file_name;
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int preprocess;
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char * app_save;
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};
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1999-05-03 15:29:11 +08:00
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2003-10-27 20:45:17 +08:00
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/* These hooks accommodate most operating systems. */
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1999-05-03 15:29:11 +08:00
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2000-09-10 04:23:15 +08:00
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void
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1999-05-03 15:29:11 +08:00
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input_file_begin ()
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{
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f_in = (FILE *) 0;
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}
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2000-09-10 04:23:15 +08:00
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void
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1999-05-03 15:29:11 +08:00
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input_file_end ()
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{
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}
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2000-09-10 04:23:15 +08:00
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/* Return BUFFER_SIZE. */
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unsigned int
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1999-05-03 15:29:11 +08:00
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input_file_buffer_size ()
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{
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return (BUFFER_SIZE);
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}
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2000-09-10 04:23:15 +08:00
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int
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1999-05-03 15:29:11 +08:00
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input_file_is_open ()
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{
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return f_in != (FILE *) 0;
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}
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/* Push the state of our input, returning a pointer to saved info that
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can be restored with input_file_pop (). */
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2001-07-10 17:45:50 +08:00
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1999-05-03 15:29:11 +08:00
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char *
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input_file_push ()
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{
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register struct saved_file *saved;
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saved = (struct saved_file *) xmalloc (sizeof *saved);
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saved->f_in = f_in;
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saved->file_name = file_name;
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saved->preprocess = preprocess;
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if (preprocess)
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saved->app_save = app_push ();
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2001-07-10 17:45:50 +08:00
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/* Initialize for new file. */
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input_file_begin ();
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1999-05-03 15:29:11 +08:00
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return (char *) saved;
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}
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void
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input_file_pop (arg)
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char *arg;
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{
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register struct saved_file *saved = (struct saved_file *) arg;
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2001-07-10 17:45:50 +08:00
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input_file_end (); /* Close out old file. */
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1999-05-03 15:29:11 +08:00
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f_in = saved->f_in;
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file_name = saved->file_name;
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preprocess = saved->preprocess;
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if (preprocess)
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app_pop (saved->app_save);
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free (arg);
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}
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void
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input_file_open (filename, pre)
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2000-09-10 04:23:15 +08:00
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char *filename; /* "" means use stdin. Must not be 0. */
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1999-05-03 15:29:11 +08:00
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int pre;
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{
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int c;
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char buf[80];
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preprocess = pre;
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2000-09-10 04:23:15 +08:00
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assert (filename != 0); /* Filename may not be NULL. */
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1999-05-03 15:29:11 +08:00
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if (filename[0])
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2003-11-07 20:19:34 +08:00
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{
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struct stat statbuf;
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if (stat (filename, &statbuf) < 0)
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{
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as_bad (_("%s: No such file"), filename);
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return;
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}
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else if (! S_ISREG (statbuf.st_mode))
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{
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as_bad (_("'%s' is not an ordinary file"), filename);
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return;
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}
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2001-07-10 17:45:50 +08:00
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f_in = fopen (filename, FOPEN_RT);
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1999-05-03 15:29:11 +08:00
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file_name = filename;
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}
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else
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2003-11-07 20:19:34 +08:00
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{
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/* Use stdin for the input file. */
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1999-05-03 15:29:11 +08:00
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f_in = stdin;
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2003-11-07 20:19:34 +08:00
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/* For error messages. */
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file_name = _("{standard input}");
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1999-05-03 15:29:11 +08:00
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}
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2003-11-07 20:19:34 +08:00
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1999-05-03 15:29:11 +08:00
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if (f_in == (FILE *) 0)
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{
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* read.c: Standardize error/warning messages - don't capitalise, no
final period or newline, don't say "ignored" or "zero assumed" for
as_bad messages. In some cases, change the wording to that used
elsewhere for similar messages.
* app.c, as.c, atof-generic.c, cgen.c, cond.c, depend.c, dwarf2dbg.c,
ecoff.c, expr.c, frags.c, input-file.c, input-scrub.c, listing.c,
output-file.c, stabs.c, subsegs.c, symbols.c, write.c: Likewise.
* ecoff.c (ecoff_directive_end): Test for missing name by
comparing input line pointers rather than reading string.
(ecoff_directive_ent): Likewise.
* read.c (s_set): Likewise.
(s_align): Report a warning rather than an error for
alignment too large.
(s_comm): Check for missing symbol name.
(s_lcomm_internal): Likewise.
(s_lsym): Likewise.
(s_globl): Use is_end_of_line instead of looking for '\n'.
(s_lcomm_internal): Likewise.
(ignore_rest_of_line): Report a warning rather than an error.
2001-08-01 09:44:25 +08:00
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as_bad (_("can't open %s for reading"), file_name);
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1999-05-03 15:29:11 +08:00
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as_perror ("%s", file_name);
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return;
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}
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c = getc (f_in);
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if (c == '#')
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2001-07-10 17:45:50 +08:00
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{
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/* Begins with comment, may not want to preprocess. */
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1999-05-03 15:29:11 +08:00
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c = getc (f_in);
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if (c == 'N')
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2002-05-18 20:53:30 +08:00
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{
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fgets (buf, 80, f_in);
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if (!strncmp (buf, "O_APP", 5) && ISSPACE (buf[5]))
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preprocess = 0;
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if (!strchr (buf, '\n'))
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ungetc ('#', f_in); /* It was longer. */
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else
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ungetc ('\n', f_in);
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}
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2001-09-27 04:32:17 +08:00
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else if (c == 'A')
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2002-05-18 20:53:30 +08:00
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{
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fgets (buf, 80, f_in);
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if (!strncmp (buf, "PP", 2) && ISSPACE (buf[2]))
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preprocess = 1;
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if (!strchr (buf, '\n'))
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ungetc ('#', f_in);
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else
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ungetc ('\n', f_in);
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}
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1999-05-03 15:29:11 +08:00
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else if (c == '\n')
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2002-05-18 20:53:30 +08:00
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ungetc ('\n', f_in);
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1999-05-03 15:29:11 +08:00
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else
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2002-05-18 20:53:30 +08:00
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ungetc ('#', f_in);
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1999-05-03 15:29:11 +08:00
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}
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else
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ungetc (c, f_in);
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}
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/* Close input file. */
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2001-07-10 17:45:50 +08:00
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2000-09-10 04:23:15 +08:00
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void
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1999-05-03 15:29:11 +08:00
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input_file_close ()
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{
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2001-07-10 17:45:50 +08:00
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/* Don't close a null file pointer. */
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1999-05-03 15:29:11 +08:00
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if (f_in != NULL)
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2001-07-10 17:45:50 +08:00
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fclose (f_in);
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1999-05-03 15:29:11 +08:00
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f_in = 0;
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2000-11-07 05:55:46 +08:00
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}
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1999-05-03 15:29:11 +08:00
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/* This function is passed to do_scrub_chars. */
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static int
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1999-06-03 08:24:14 +08:00
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input_file_get (buf, buflen)
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char *buf;
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int buflen;
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1999-05-03 15:29:11 +08:00
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{
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int size;
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1999-06-03 08:24:14 +08:00
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size = fread (buf, sizeof (char), buflen, f_in);
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1999-05-03 15:29:11 +08:00
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if (size < 0)
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{
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as_perror (_("Can't read from %s"), file_name);
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size = 0;
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}
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return size;
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}
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/* Read a buffer from the input file. */
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char *
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input_file_give_next_buffer (where)
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2000-09-10 04:23:15 +08:00
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char *where; /* Where to place 1st character of new buffer. */
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1999-05-03 15:29:11 +08:00
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{
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2000-09-10 04:23:15 +08:00
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char *return_value; /* -> Last char of what we read, + 1. */
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1999-05-03 15:29:11 +08:00
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register int size;
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if (f_in == (FILE *) 0)
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return 0;
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2001-07-10 17:45:50 +08:00
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/* fflush (stdin); could be done here if you want to synchronise
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stdin and stdout, for the case where our input file is stdin.
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Since the assembler shouldn't do any output to stdout, we
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don't bother to synch output and input. */
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1999-05-03 15:29:11 +08:00
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if (preprocess)
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size = do_scrub_chars (input_file_get, where, BUFFER_SIZE);
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else
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size = fread (where, sizeof (char), BUFFER_SIZE, f_in);
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if (size < 0)
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{
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as_perror (_("Can't read from %s"), file_name);
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size = 0;
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}
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if (size)
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return_value = where + size;
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else
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{
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if (fclose (f_in))
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as_perror (_("Can't close %s"), file_name);
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f_in = (FILE *) 0;
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return_value = 0;
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}
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2001-07-10 17:45:50 +08:00
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return return_value;
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1999-05-03 15:29:11 +08:00
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}
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