[binutils.git] / gas / input-file.c

/* input_file.c - Deal with Input Files -
   Copyright (C) 1987, 1990, 1991 Free Software Foundation, Inc.

This file is part of GAS, the GNU Assembler.

GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.

GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* static const char rcsid[] = "$Id$"; */

/*
 * Confines all details of reading source bytes to this module.
 * All O/S specific crocks should live here.
 * What we lose in "efficiency" we gain in modularity.
 * Note we don't need to #include the "as.h" file. No common coupling!
 */

#ifdef USG
#define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size))
#endif

#include <stdio.h>
#include <assert.h>
#include <string.h>

#include "as.h"
#include "input-file.h"

/* This variable is non-zero if the file currently being read should be
   preprocessed by app.  It is zero if the file can be read straight in.
 */
int preprocess = 0;

/*
 * This code opens a file, then delivers BUFFER_SIZE character
 * chunks of the file on demand.
 * BUFFER_SIZE is supposed to be a number chosen for speed.
 * The caller only asks once what BUFFER_SIZE is, and asks before
 * the nature of the input files (if any) is known.
 */

#define BUFFER_SIZE (32 * 1024)

/*
 * We use static data: the data area is not sharable.
 */

FILE *f_in;
/* static JF remove static so app.c can use file_name */
char *	file_name;

/* Struct for saving the state of this module for file includes.  */
struct saved_file {
  FILE *f_in;
  char *file_name;
  int	preprocess;
  char *app_save;
};
\f
/* These hooks accomodate most operating systems. */

void input_file_begin() {
  f_in = (FILE *)0;
}

void input_file_end () { }

 /* Return BUFFER_SIZE. */
int input_file_buffer_size() {
  return (BUFFER_SIZE);
}

int input_file_is_open() {
  return f_in!=(FILE *)0;
}

/* Push the state of our input, returning a pointer to saved info that
   can be restored with input_file_pop ().  */
char *input_file_push () {
  register struct saved_file *saved;

  saved = (struct saved_file *)xmalloc (sizeof *saved);

  saved->f_in		= f_in;
  saved->file_name	= file_name;
  saved->preprocess	= preprocess;
  if (preprocess)
    saved->app_save	= app_push ();

  input_file_begin ();	/* Initialize for new file */

  return (char *)saved;
}

void
input_file_pop (arg)
     char *arg;
{
  register struct saved_file *saved = (struct saved_file *)arg;

  input_file_end ();	/* Close out old file */

  f_in			= saved->f_in;
  file_name		= saved->file_name;
  preprocess		= saved->preprocess;
  if (preprocess)
    app_pop	 	 (saved->app_save);

  free(arg);
}
\f
#ifdef DONTDEF		/* JF save old version in case we need it */
void
input_file_open (filename, preprocess, debugging)
     char *	filename;	/* "" means use stdin. Must not be 0. */
     int	preprocess;	/* TRUE if needs app. */
     int	debugging;	/* TRUE if we are debugging assembler. */
{
  assert( filename != 0 );	/* Filename may not be NULL. */
  if (filename [0])
    {				/* We have a file name. Suck it and see. */
      file_handle = open (filename, O_RDONLY, 0);
      file_name = filename;
    }
  else
    {				/* use stdin for the input file. */
      file_handle = fileno (stdin);
      file_name = "{standard input}"; /* For error messages. */
    }
  if (file_handle < 0)
      as_perror ("Can't open %s for reading", file_name);
  if ( preprocess )
    {
/*
 * This code was written in haste for a frobbed BSD 4.2.
 * I have a flight to catch: will someone please do proper
 * error checks? - Dean.
 */
      int	pid;
      char temporary_file_name [12];
      int	fd;
      union wait	status;

      (void)strcpy (temporary_file_name, "#appXXXXXX");
      (void)mktemp (temporary_file_name);
      pid = vfork ();
      if (pid == -1)
	{
	  as_perror ("Vfork failed", file_name);
	  _exit (144);
	}
      if (pid == 0)
	{
	  (void)dup2 (file_handle, fileno(stdin));
	  fd = open (temporary_file_name, O_WRONLY + O_TRUNC + O_CREAT, 0666);
	  if (fd == -1)
	    {
	      (void)write(2,"Can't open temporary\n",21);
	      _exit (99);
	    }
	  (void)dup2 (fd, fileno(stdout));
/* JF for testing #define PREPROCESSOR "/lib/app" */
#define PREPROCESSOR "./app"
	  execl (PREPROCESSOR, PREPROCESSOR, 0);
	  execl ("app","app",0);
	  (void)write(2,"Exec of app failed.  Get help.\n",31);
	  (void)unlink(temporary_file_name);
	  _exit (11);
	}
      (void)wait (& status);
      if (status.w_status & 0xFF00)		/* JF was 0xF000, was wrong */
	{
	  file_handle = -1;
	  as_bad( "Can't preprocess file \"%s\", status = %xx", file_name, status.w_status );
	}
      else
	{
	  file_handle = open (temporary_file_name, O_RDONLY, 0);
	  if ( ! debugging && unlink(temporary_file_name))
	    as_perror ("Can't delete temp file %s", temporary_file_name);
	}
      if (file_handle == -1)
	  as_perror ("Can't retrieve temp file %s", temporary_file_name);
    }
}
#else

void
input_file_open (filename,pre)
     char *	filename;	/* "" means use stdin. Must not be 0. */
     int pre;
{
	int	c;
	char	buf[80];

	preprocess = pre;

	assert( filename != 0 );	/* Filename may not be NULL. */
	if (filename [0]) {	/* We have a file name. Suck it and see. */
		f_in=fopen(filename,"r");
		file_name=filename;
	} else {			/* use stdin for the input file. */
		f_in = stdin;
		file_name = "{standard input}"; /* For error messages. */
	}
	if (f_in==(FILE *)0) {
		as_perror ("Can't open %s for reading", file_name);
		return;
	}

#ifndef VMS
	/* Ask stdio to buffer our input at BUFFER_SIZE, with a dynamically
	   allocated buffer.  */
	setvbuf(f_in, (char *)NULL, _IOFBF, BUFFER_SIZE);
#endif /* VMS */

	c = getc(f_in);
	if (c == '#') {	/* Begins with comment, may not want to preprocess */
		c = getc(f_in);
		if (c == 'N') {
			fgets(buf,80,f_in);
			if (!strcmp(buf,"O_APP\n"))
				preprocess=0;
			if (!strchr(buf,'\n'))
				ungetc('#',f_in);	/* It was longer */
			else
				ungetc('\n',f_in);
		} else if(c=='\n')
			ungetc('\n',f_in);
		else
			ungetc('#',f_in);
	} else
		ungetc(c,f_in);

#ifdef DONTDEF
	if ( preprocess ) {
		char temporary_file_name [17];
		FILE	*f_out;

		(void)strcpy (temporary_file_name, "/tmp/#appXXXXXX");
		(void)mktemp (temporary_file_name);
		f_out=fopen(temporary_file_name,"w+");
		if(f_out==(FILE *)0)
			as_perror("Can't open temp file %s",temporary_file_name);

			/* JF this will have to be moved on any system that
			   does not support removal of open files.  */
		(void)unlink(temporary_file_name);/* JF do it NOW */
		do_scrub(f_in,f_out);
		(void)fclose(f_in);	/* All done with it */
		(void)rewind(f_out);
		f_in=f_out;
	}
#endif
}
#endif

/* Close input file.  */
void input_file_close() {
  fclose (f_in);
  f_in = 0;
}

char *
input_file_give_next_buffer (where)
     char *		where;	/* Where to place 1st character of new buffer. */
{
  char *	return_value;	/* -> Last char of what we read, + 1. */
  register int	size;

  if (f_in == (FILE *)0)
      return 0;
      /*
       * fflush (stdin); could be done here if you want to synchronise
       * stdin and stdout, for the case where our input file is stdin.
       * Since the assembler shouldn't do any output to stdout, we
       * don't bother to synch output and input.
       */
  if(preprocess) {
	char *p;
	int n;
	int ch;
	extern FILE *scrub_file;

	scrub_file=f_in;
	for (p = where, n = BUFFER_SIZE; n; --n) {

		ch = do_scrub_next_char(scrub_from_file, scrub_to_file);
		if (ch == EOF)
			break;
		*p++=ch;
	}
	size=BUFFER_SIZE-n;
  } else
	size= fread(where,sizeof(char),BUFFER_SIZE,f_in);
  if (size < 0)
    {
      as_perror ("Can't read from %s", file_name);
      size = 0;
    }
  if (size)
    return_value = where + size;
  else
    {
      if (fclose (f_in))
	as_perror ("Can't close %s", file_name);
      f_in = (FILE *)0;
      return_value = 0;
    }
  return (return_value);
}
Commit	Line	Data
fecd2382 RP	1	/* input_file.c - Deal with Input Files -
	2	Copyright (C) 1987, 1990, 1991 Free Software Foundation, Inc.
	3
	4	This file is part of GAS, the GNU Assembler.
	5
	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 1, or (at your option)
	9	any later version.
	10
	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.
	15
	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. */
	19
	20	/* static const char rcsid[] = "$Id$"; */
	21
	22	/*
	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!
	27	*/
	28
	29	#ifdef USG
	30	#define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size))
	31	#endif
	32
	33	#include <stdio.h>
	34	#include <assert.h>
	35	#include <string.h>
	36
	37	#include "as.h"
	38	#include "input-file.h"
	39
	40	/* This variable is non-zero if the file currently being read should be
	41	preprocessed by app. It is zero if the file can be read straight in.
	42	*/
	43	int preprocess = 0;
	44
	45	/*
	46	* This code opens a file, then delivers BUFFER_SIZE character
	47	* chunks of the file on demand.
	48	* BUFFER_SIZE is supposed to be a number chosen for speed.
	49	* The caller only asks once what BUFFER_SIZE is, and asks before
	50	* the nature of the input files (if any) is known.
	51	*/
	52
	53	#define BUFFER_SIZE (32 * 1024)
	54
	55	/*
	56	* We use static data: the data area is not sharable.
	57	*/
	58
	59	FILE *f_in;
	60	/* static JF remove static so app.c can use file_name */
	61	char * file_name;
	62
	63	/* Struct for saving the state of this module for file includes. */
	64	struct saved_file {
65	FILE *f_in;
66	char *file_name;
67	int preprocess;
68	char *app_save;
69	};
70	\f
71	/* These hooks accomodate most operating systems. */
72
73	void input_file_begin() {
74	f_in = (FILE *)0;
75	}
76
77	void input_file_end () { }
78
79	/* Return BUFFER_SIZE. */
80	int input_file_buffer_size() {
81	return (BUFFER_SIZE);
82	}
83
84	int input_file_is_open() {
85	return f_in!=(FILE *)0;
86	}
87
88	/* Push the state of our input, returning a pointer to saved info that
89	can be restored with input_file_pop (). */
90	char *input_file_push () {
91	register struct saved_file *saved;
92
93	saved = (struct saved_file )xmalloc (sizeof saved);
94
95	saved->f_in = f_in;
96	saved->file_name = file_name;
97	saved->preprocess = preprocess;
98	if (preprocess)
99	saved->app_save = app_push ();
100
101	input_file_begin (); /* Initialize for new file */
102
103	return (char *)saved;
104	}
105
106	void
107	input_file_pop (arg)
108	char *arg;
109	{
110	register struct saved_file saved = (struct saved_file )arg;
111
112	input_file_end (); /* Close out old file */
113
114	f_in = saved->f_in;
115	file_name = saved->file_name;
116	preprocess = saved->preprocess;
117	if (preprocess)
118	app_pop (saved->app_save);
119
120	free(arg);
121	}
122	\f
123	#ifdef DONTDEF /* JF save old version in case we need it */
124	void
125	input_file_open (filename, preprocess, debugging)
126	char * filename; /* "" means use stdin. Must not be 0. */
127	int preprocess; /* TRUE if needs app. */
128	int debugging; /* TRUE if we are debugging assembler. */
129	{
130	assert( filename != 0 ); /* Filename may not be NULL. */
131	if (filename [0])
132	{ /* We have a file name. Suck it and see. */
133	file_handle = open (filename, O_RDONLY, 0);
134	file_name = filename;
135	}
136	else
137	{ /* use stdin for the input file. */
138	file_handle = fileno (stdin);
139	file_name = "{standard input}"; /* For error messages. */
140	}
141	if (file_handle < 0)
142	as_perror ("Can't open %s for reading", file_name);
143	if ( preprocess )
144	{
145	/*
146	* This code was written in haste for a frobbed BSD 4.2.
147	* I have a flight to catch: will someone please do proper
148	* error checks? - Dean.
149	*/
150	int pid;
151	char temporary_file_name [12];
152	int fd;
153	union wait status;
154
155	(void)strcpy (temporary_file_name, "#appXXXXXX");
156	(void)mktemp (temporary_file_name);
157	pid = vfork ();
158	if (pid == -1)
159	{
160	as_perror ("Vfork failed", file_name);
161	_exit (144);
162	}
163	if (pid == 0)
164	{
165	(void)dup2 (file_handle, fileno(stdin));
166	fd = open (temporary_file_name, O_WRONLY + O_TRUNC + O_CREAT, 0666);
167	if (fd == -1)
168	{
169	(void)write(2,"Can't open temporary\n",21);
170	_exit (99);
171	}
172	(void)dup2 (fd, fileno(stdout));
173	/* JF for testing #define PREPROCESSOR "/lib/app" */
174	#define PREPROCESSOR "./app"
175	execl (PREPROCESSOR, PREPROCESSOR, 0);
176	execl ("app","app",0);
177	(void)write(2,"Exec of app failed. Get help.\n",31);
178	(void)unlink(temporary_file_name);
179	_exit (11);
180	}
181	(void)wait (& status);
182	if (status.w_status & 0xFF00) /* JF was 0xF000, was wrong */
183	{
184	file_handle = -1;
185	as_bad( "Can't preprocess file \"%s\", status = %xx", file_name, status.w_status );
186	}
187	else
188	{
189	file_handle = open (temporary_file_name, O_RDONLY, 0);
190	if ( ! debugging && unlink(temporary_file_name))
191	as_perror ("Can't delete temp file %s", temporary_file_name);
192	}
193	if (file_handle == -1)
194	as_perror ("Can't retrieve temp file %s", temporary_file_name);
195	}
196	}
197	#else
198
199	void
200	input_file_open (filename,pre)
201	char * filename; /* "" means use stdin. Must not be 0. */
202	int pre;
203	{
204	int c;
205	char buf[80];
206
207	preprocess = pre;
208
209	assert( filename != 0 ); /* Filename may not be NULL. */
210	if (filename [0]) { /* We have a file name. Suck it and see. */
211	f_in=fopen(filename,"r");
212	file_name=filename;
213	} else { /* use stdin for the input file. */
214	f_in = stdin;
215	file_name = "{standard input}"; /* For error messages. */
216	}
217	if (f_in==(FILE *)0) {
218	as_perror ("Can't open %s for reading", file_name);
219	return;
220	}
221
222	#ifndef VMS
223	/* Ask stdio to buffer our input at BUFFER_SIZE, with a dynamically
224	allocated buffer. */
225	setvbuf(f_in, (char *)NULL, _IOFBF, BUFFER_SIZE);
226	#endif /* VMS */
227
228	c = getc(f_in);
229	if (c == '#') { /* Begins with comment, may not want to preprocess */
230	c = getc(f_in);
231	if (c == 'N') {
232	fgets(buf,80,f_in);
233	if (!strcmp(buf,"O_APP\n"))
234	preprocess=0;
235	if (!strchr(buf,'\n'))
236	ungetc('#',f_in); /* It was longer */
237	else
238	ungetc('\n',f_in);
239	} else if(c=='\n')
240	ungetc('\n',f_in);
241	else
242	ungetc('#',f_in);
243	} else
244	ungetc(c,f_in);
245
246	#ifdef DONTDEF
247	if ( preprocess ) {
248	char temporary_file_name [17];
249	FILE *f_out;
250
251	(void)strcpy (temporary_file_name, "/tmp/#appXXXXXX");
252	(void)mktemp (temporary_file_name);
253	f_out=fopen(temporary_file_name,"w+");
254	if(f_out==(FILE *)0)
255	as_perror("Can't open temp file %s",temporary_file_name);
256
257	/* JF this will have to be moved on any system that
258	does not support removal of open files. */
259	(void)unlink(temporary_file_name);/* JF do it NOW */
260	do_scrub(f_in,f_out);
261	(void)fclose(f_in); /* All done with it */
262	(void)rewind(f_out);
263	f_in=f_out;
264	}
265	#endif
266	}
267	#endif
268
269	/* Close input file. */
270	void input_file_close() {
271	fclose (f_in);
272	f_in = 0;
273	}
274
275	char *
276	input_file_give_next_buffer (where)
277	char * where; /* Where to place 1st character of new buffer. */
278	{
279	char * return_value; /* -> Last char of what we read, + 1. */
280	register int size;
281
282	if (f_in == (FILE *)0)
283	return 0;
284	/*
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.
289	*/
290	if(preprocess) {
291	char *p;
292	int n;
293	int ch;
294	extern FILE *scrub_file;
295
296	scrub_file=f_in;
297	for (p = where, n = BUFFER_SIZE; n; --n) {
298
299	ch = do_scrub_next_char(scrub_from_file, scrub_to_file);
300	if (ch == EOF)
301	break;
302	*p++=ch;
303	}
304	size=BUFFER_SIZE-n;
305	} else
306	size= fread(where,sizeof(char),BUFFER_SIZE,f_in);
307	if (size < 0)
308	{
309	as_perror ("Can't read from %s", file_name);
310	size = 0;
311	}
312	if (size)
313	return_value = where + size;
314	else
315	{
316	if (fclose (f_in))
317	as_perror ("Can't close %s", file_name);
318	f_in = (FILE *)0;
319	return_value = 0;
320	}
321	return (return_value);
322	}