1 /* input_file.c - Deal with Input Files -
2 Copyright (C) 1987, 1990, 1991, 1992 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. */
70 /* These hooks accomodate most operating systems. */
83 /* Return BUFFER_SIZE. */
85 input_file_buffer_size ()
93 return f_in != (FILE *) 0;
96 /* Push the state of our input, returning a pointer to saved info that
97 can be restored with input_file_pop (). */
101 register struct saved_file *saved;
103 saved = (struct saved_file *) xmalloc (sizeof *saved);
106 saved->file_name = file_name;
107 saved->preprocess = preprocess;
109 saved->app_save = app_push ();
111 input_file_begin (); /* Initialize for new file */
113 return (char *) saved;
120 register struct saved_file *saved = (struct saved_file *) arg;
122 input_file_end (); /* Close out old file */
125 file_name = saved->file_name;
126 preprocess = saved->preprocess;
128 app_pop (saved->app_save);
133 #ifdef DONTDEF /* JF save old version in case we need it */
135 input_file_open (filename, preprocess, debugging)
136 char *filename; /* "" means use stdin. Must not be 0. */
137 int preprocess; /* TRUE if needs app. */
138 int debugging; /* TRUE if we are debugging assembler. */
140 assert (filename != 0); /* Filename may not be NULL. */
142 { /* We have a file name. Suck it and see. */
143 file_handle = open (filename, O_RDONLY, 0);
144 file_name = filename;
147 { /* use stdin for the input file. */
148 file_handle = fileno (stdin);
149 file_name = "{standard input}"; /* For error messages. */
152 as_perror ("Can't open %s for reading", file_name);
156 * This code was written in haste for a frobbed BSD 4.2.
157 * I have a flight to catch: will someone please do proper
158 * error checks? - Dean.
161 char temporary_file_name[12];
165 (void) strcpy (temporary_file_name, "#appXXXXXX");
166 (void) mktemp (temporary_file_name);
170 as_perror ("Vfork failed", file_name);
175 (void) dup2 (file_handle, fileno (stdin));
176 fd = open (temporary_file_name, O_WRONLY + O_TRUNC + O_CREAT, 0666);
179 (void) write (2, "Can't open temporary\n", 21);
182 (void) dup2 (fd, fileno (stdout));
183 /* JF for testing #define PREPROCESSOR "/lib/app" */
184 #define PREPROCESSOR "./app"
185 execl (PREPROCESSOR, PREPROCESSOR, 0);
186 execl ("app", "app", 0);
187 (void) write (2, "Exec of app failed. Get help.\n", 31);
188 (void) unlink (temporary_file_name);
191 (void) wait (&status);
192 if (status.w_status & 0xFF00) /* JF was 0xF000, was wrong */
195 as_bad ("Can't preprocess file \"%s\", status = %xx", file_name, status.w_status);
199 file_handle = open (temporary_file_name, O_RDONLY, 0);
200 if (!debugging && unlink (temporary_file_name))
201 as_perror ("Can't delete temp file %s", temporary_file_name);
203 if (file_handle == -1)
204 as_perror ("Can't retrieve temp file %s", temporary_file_name);
211 input_file_open (filename, pre)
212 char *filename; /* "" means use stdin. Must not be 0. */
220 assert (filename != 0); /* Filename may not be NULL. */
222 { /* We have a file name. Suck it and see. */
223 f_in = fopen (filename, "r");
224 file_name = filename;
227 { /* use stdin for the input file. */
229 file_name = "{standard input}"; /* For error messages. */
231 if (f_in == (FILE *) 0)
233 as_perror ("Can't open %s for reading", file_name);
238 /* Ask stdio to buffer our input at BUFFER_SIZE, with a dynamically
240 setvbuf (f_in, (char *) NULL, _IOFBF, BUFFER_SIZE);
245 { /* Begins with comment, may not want to preprocess */
249 fgets (buf, 80, f_in);
250 if (!strcmp (buf, "O_APP\n"))
252 if (!strchr (buf, '\n'))
253 ungetc ('#', f_in); /* It was longer */
268 char temporary_file_name[17];
271 (void) strcpy (temporary_file_name, "/tmp/#appXXXXXX");
272 (void) mktemp (temporary_file_name);
273 f_out = fopen (temporary_file_name, "w+");
274 if (f_out == (FILE *) 0)
275 as_perror ("Can't open temp file %s", temporary_file_name);
277 /* JF this will have to be moved on any system that
278 does not support removal of open files. */
279 (void) unlink (temporary_file_name); /* JF do it NOW */
280 do_scrub (f_in, f_out);
281 (void) fclose (f_in); /* All done with it */
282 (void) rewind (f_out);
290 /* Close input file. */
297 } /* don't close a null file pointer */
299 } /* input_file_close() */
302 input_file_give_next_buffer (where)
303 char *where; /* Where to place 1st character of new buffer. */
305 char *return_value; /* -> Last char of what we read, + 1. */
308 if (f_in == (FILE *) 0)
311 * fflush (stdin); could be done here if you want to synchronise
312 * stdin and stdout, for the case where our input file is stdin.
313 * Since the assembler shouldn't do any output to stdout, we
314 * don't bother to synch output and input.
321 extern FILE *scrub_file;
324 for (p = where, n = BUFFER_SIZE; n; --n)
327 ch = do_scrub_next_char (scrub_from_file, scrub_to_file);
332 size = BUFFER_SIZE - n;
335 size = fread (where, sizeof (char), BUFFER_SIZE, f_in);
338 as_perror ("Can't read from %s", file_name);
342 return_value = where + size;
346 as_perror ("Can't close %s", file_name);
350 return (return_value);
353 /* end of input-file.c */