1 /* input_file.c - Deal with Input Files -
2 Copyright (C) 1987, 1990, 1991 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 * Confines all details of reading source bytes to this module.
22 * All O/S specific crocks should live here.
23 * What we lose in "efficiency" we gain in modularity.
24 * Note we don't need to #include the "as.h" file. No common coupling!
28 #define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size))
36 #include "input-file.h"
38 /* This variable is non-zero if the file currently being read should be
39 preprocessed by app. It is zero if the file can be read straight in.
44 * This code opens a file, then delivers BUFFER_SIZE character
45 * chunks of the file on demand.
46 * BUFFER_SIZE is supposed to be a number chosen for speed.
47 * The caller only asks once what BUFFER_SIZE is, and asks before
48 * the nature of the input files (if any) is known.
51 #define BUFFER_SIZE (32 * 1024)
54 * We use static data: the data area is not sharable.
58 /* static JF remove static so app.c can use file_name */
61 /* Struct for saving the state of this module for file includes. */
69 /* These hooks accomodate most operating systems. */
71 void input_file_begin() {
75 void input_file_end () { }
77 /* Return BUFFER_SIZE. */
78 int input_file_buffer_size() {
82 int input_file_is_open() {
83 return f_in!=(FILE *)0;
86 /* Push the state of our input, returning a pointer to saved info that
87 can be restored with input_file_pop (). */
88 char *input_file_push () {
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 input_file_begin (); /* Initialize for new file */
101 return (char *)saved;
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);
121 #ifdef DONTDEF /* JF save old version in case we need it */
123 input_file_open (filename, preprocess, debugging)
124 char * filename; /* "" means use stdin. Must not be 0. */
125 int preprocess; /* TRUE if needs app. */
126 int debugging; /* TRUE if we are debugging assembler. */
128 assert( filename != 0 ); /* Filename may not be NULL. */
130 { /* We have a file name. Suck it and see. */
131 file_handle = open (filename, O_RDONLY, 0);
132 file_name = filename;
135 { /* use stdin for the input file. */
136 file_handle = fileno (stdin);
137 file_name = "{standard input}"; /* For error messages. */
140 as_perror ("Can't open %s for reading", file_name);
144 * This code was written in haste for a frobbed BSD 4.2.
145 * I have a flight to catch: will someone please do proper
146 * error checks? - Dean.
149 char temporary_file_name [12];
153 (void)strcpy (temporary_file_name, "#appXXXXXX");
154 (void)mktemp (temporary_file_name);
158 as_perror ("Vfork failed", file_name);
163 (void)dup2 (file_handle, fileno(stdin));
164 fd = open (temporary_file_name, O_WRONLY + O_TRUNC + O_CREAT, 0666);
167 (void)write(2,"Can't open temporary\n",21);
170 (void)dup2 (fd, fileno(stdout));
171 /* JF for testing #define PREPROCESSOR "/lib/app" */
172 #define PREPROCESSOR "./app"
173 execl (PREPROCESSOR, PREPROCESSOR, 0);
174 execl ("app","app",0);
175 (void)write(2,"Exec of app failed. Get help.\n",31);
176 (void)unlink(temporary_file_name);
179 (void)wait (& status);
180 if (status.w_status & 0xFF00) /* JF was 0xF000, was wrong */
183 as_bad( "Can't preprocess file \"%s\", status = %xx", file_name, status.w_status );
187 file_handle = open (temporary_file_name, O_RDONLY, 0);
188 if ( ! debugging && unlink(temporary_file_name))
189 as_perror ("Can't delete temp file %s", temporary_file_name);
191 if (file_handle == -1)
192 as_perror ("Can't retrieve temp file %s", temporary_file_name);
198 input_file_open (filename,pre)
199 char * filename; /* "" means use stdin. Must not be 0. */
207 assert( filename != 0 ); /* Filename may not be NULL. */
208 if (filename [0]) { /* We have a file name. Suck it and see. */
209 f_in=fopen(filename,"r");
211 } else { /* use stdin for the input file. */
213 file_name = "{standard input}"; /* For error messages. */
215 if (f_in==(FILE *)0) {
216 as_perror ("Can't open %s for reading", file_name);
221 /* Ask stdio to buffer our input at BUFFER_SIZE, with a dynamically
223 setvbuf(f_in, (char *)NULL, _IOFBF, BUFFER_SIZE);
227 if (c == '#') { /* Begins with comment, may not want to preprocess */
231 if (!strcmp(buf,"O_APP\n"))
233 if (!strchr(buf,'\n'))
234 ungetc('#',f_in); /* It was longer */
246 char temporary_file_name [17];
249 (void)strcpy (temporary_file_name, "/tmp/#appXXXXXX");
250 (void)mktemp (temporary_file_name);
251 f_out=fopen(temporary_file_name,"w+");
253 as_perror("Can't open temp file %s",temporary_file_name);
255 /* JF this will have to be moved on any system that
256 does not support removal of open files. */
257 (void)unlink(temporary_file_name);/* JF do it NOW */
258 do_scrub(f_in,f_out);
259 (void)fclose(f_in); /* All done with it */
267 /* Close input file. */
268 void input_file_close() {
271 } /* don't close a null file pointer */
273 } /* input_file_close() */
276 input_file_give_next_buffer (where)
277 char * where; /* Where to place 1st character of new buffer. */
279 char * return_value; /* -> Last char of what we read, + 1. */
282 if (f_in == (FILE *)0)
285 * fflush (stdin); could be done here if you want to synchronise
286 * stdin and stdout, for the case where our input file is stdin.
287 * Since the assembler shouldn't do any output to stdout, we
288 * don't bother to synch output and input.
294 extern FILE *scrub_file;
297 for (p = where, n = BUFFER_SIZE; n; --n) {
299 ch = do_scrub_next_char(scrub_from_file, scrub_to_file);
306 size= fread(where,sizeof(char),BUFFER_SIZE,f_in);
309 as_perror ("Can't read from %s", file_name);
313 return_value = where + size;
317 as_perror ("Can't close %s", file_name);
321 return (return_value);
324 /* end of input-file.c */