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

/* input_file.c - Deal with Input Files -
   Copyright (C) 1987, 1990, 1991, 1992 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 2, 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.  */

/*
 * 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;
    }

#ifdef _IOFBF
  /* 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 ()
{
  if (f_in != NULL)
    {
      fclose (f_in);
    }				/* don't close a null file pointer */
  f_in = 0;
}				/* input_file_close() */

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);
}

/* end of input-file.c */
Commit	Line	Data
fecd2382	1	/* input_file.c - Deal with Input Files -
6efd877d KR	2	Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc.
6efd877d KR	3
a39116f1	4	This file is part of GAS, the GNU Assembler.
6efd877d	5
a39116f1 RP	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)
	9	any later version.
6efd877d	10
a39116f1 RP	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.
6efd877d	15
a39116f1 RP	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. */
fecd2382 RP	19
	20	/*
	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!
	25	*/
	26
	27	#ifdef USG
	28	#define setbuffer(stream, buf, size) setvbuf((stream), (buf), _IOFBF, (size))
	29	#endif
	30
	31	#include <stdio.h>
	32	#include <assert.h>
	33	#include <string.h>
	34
	35	#include "as.h"
	36	#include "input-file.h"
	37
	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.
a39116f1	40	*/
fecd2382 RP	41	int preprocess = 0;
	42
	43	/*
	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.
	49	*/
	50
	51	#define BUFFER_SIZE (32 * 1024)
	52
	53	/*
	54	* We use static data: the data area is not sharable.
	55	*/
	56
	57	FILE *f_in;
	58	/* static JF remove static so app.c can use file_name */
6efd877d	59	char *file_name;
fecd2382 RP	60
fecd2382 RP	61	/* Struct for saving the state of this module for file includes. */
6efd877d KR	62	struct saved_file
	63	{
	64	FILE *f_in;
	65	char *file_name;
	66	int preprocess;
	67	char *app_save;
	68	};
fecd2382 RP	69	\f
	70	/* These hooks accomodate most operating systems. */
	71
6efd877d KR	72	void
	73	input_file_begin ()
	74	{
	75	f_in = (FILE *) 0;
fecd2382 RP	76	}
fecd2382 RP	77
6efd877d KR	78	void
	79	input_file_end ()
	80	{
	81	}
fecd2382	82
a39116f1	83	/* Return BUFFER_SIZE. */
6efd877d KR	84	int
	85	input_file_buffer_size ()
	86	{
	87	return (BUFFER_SIZE);
fecd2382 RP	88	}
fecd2382 RP	89
6efd877d KR	90	int
	91	input_file_is_open ()
	92	{
	93	return f_in != (FILE *) 0;
fecd2382 RP	94	}
	95
	96	/* Push the state of our input, returning a pointer to saved info that
	97	can be restored with input_file_pop (). */
6efd877d KR	98	char *
	99	input_file_push ()
	100	{
	101	register struct saved_file *saved;
	102
	103	saved = (struct saved_file ) xmalloc (sizeof saved);
	104
	105	saved->f_in = f_in;
	106	saved->file_name = file_name;
	107	saved->preprocess = preprocess;
	108	if (preprocess)
	109	saved->app_save = app_push ();
	110
	111	input_file_begin (); /* Initialize for new file */
	112
	113	return (char *) saved;
fecd2382 RP	114	}
	115
	116	void
6efd877d KR	117	input_file_pop (arg)
6efd877d KR	118	char *arg;
fecd2382	119	{
6efd877d KR	120	register struct saved_file saved = (struct saved_file ) arg;
	121
	122	input_file_end (); /* Close out old file */
	123
	124	f_in = saved->f_in;
	125	file_name = saved->file_name;
	126	preprocess = saved->preprocess;
	127	if (preprocess)
	128	app_pop (saved->app_save);
	129
	130	free (arg);
fecd2382 RP	131	}
fecd2382 RP	132	\f
6efd877d	133	#ifdef DONTDEF /* JF save old version in case we need it */
fecd2382	134	void
6efd877d KR	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. */
fecd2382	139	{
6efd877d KR	140	assert (filename != 0); /* Filename may not be NULL. */
	141	if (filename[0])
	142	{ /* We have a file name. Suck it and see. */
	143	file_handle = open (filename, O_RDONLY, 0);
	144	file_name = filename;
	145	}
	146	else
	147	{ /* use stdin for the input file. */
	148	file_handle = fileno (stdin);
	149	file_name = "{standard input}"; /* For error messages. */
	150	}
	151	if (file_handle < 0)
	152	as_perror ("Can't open %s for reading", file_name);
	153	if (preprocess)
	154	{
	155	/*
a39116f1 RP	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.
	159	*/
6efd877d KR	160	int pid;
	161	char temporary_file_name[12];
	162	int fd;
	163	union wait status;
	164
	165	(void) strcpy (temporary_file_name, "#appXXXXXX");
	166	(void) mktemp (temporary_file_name);
	167	pid = vfork ();
	168	if (pid == -1)
	169	{
	170	as_perror ("Vfork failed", file_name);
	171	_exit (144);
	172	}
	173	if (pid == 0)
	174	{
	175	(void) dup2 (file_handle, fileno (stdin));
	176	fd = open (temporary_file_name, O_WRONLY + O_TRUNC + O_CREAT, 0666);
	177	if (fd == -1)
	178	{
	179	(void) write (2, "Can't open temporary\n", 21);
	180	_exit (99);
a39116f1	181	}
6efd877d KR	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);
	189	_exit (11);
	190	}
	191	(void) wait (&status);
	192	if (status.w_status & 0xFF00) /* JF was 0xF000, was wrong */
	193	{
	194	file_handle = -1;
	195	as_bad ("Can't preprocess file \"%s\", status = %xx", file_name, status.w_status);
	196	}
	197	else
	198	{
	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);
	202	}
	203	if (file_handle == -1)
	204	as_perror ("Can't retrieve temp file %s", temporary_file_name);
	205	}
fecd2382	206	}
6efd877d	207
fecd2382 RP	208	#else
	209
	210	void
6efd877d KR	211	input_file_open (filename, pre)
	212	char filename; / "" means use stdin. Must not be 0. */
	213	int pre;
fecd2382	214	{
6efd877d KR	215	int c;
	216	char buf[80];
	217
	218	preprocess = pre;
	219
	220	assert (filename != 0); /* Filename may not be NULL. */
	221	if (filename[0])
	222	{ /* We have a file name. Suck it and see. */
	223	f_in = fopen (filename, "r");
	224	file_name = filename;
	225	}
	226	else
	227	{ /* use stdin for the input file. */
	228	f_in = stdin;
	229	file_name = "{standard input}"; /* For error messages. */
	230	}
	231	if (f_in == (FILE *) 0)
	232	{
	233	as_perror ("Can't open %s for reading", file_name);
	234	return;
	235	}
	236
	237	#ifdef _IOFBF
	238	/* Ask stdio to buffer our input at BUFFER_SIZE, with a dynamically
fecd2382	239	allocated buffer. */
6efd877d	240	setvbuf (f_in, (char *) NULL, _IOFBF, BUFFER_SIZE);
fecd2382	241	#endif /* VMS */
6efd877d KR	242
	243	c = getc (f_in);
	244	if (c == '#')
	245	{ /* Begins with comment, may not want to preprocess */
	246	c = getc (f_in);
	247	if (c == 'N')
	248	{
	249	fgets (buf, 80, f_in);
	250	if (!strcmp (buf, "O_APP\n"))
	251	preprocess = 0;
	252	if (!strchr (buf, '\n'))
	253	ungetc ('#', f_in); /* It was longer */
	254	else
	255	ungetc ('\n', f_in);
	256	}
	257	else if (c == '\n')
	258	ungetc ('\n', f_in);
	259	else
	260	ungetc ('#', f_in);
	261	}
	262	else
	263	ungetc (c, f_in);
	264
fecd2382	265	#ifdef DONTDEF
6efd877d KR	266	if (preprocess)
	267	{
	268	char temporary_file_name[17];
	269	FILE *f_out;
	270
	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);
	276
	277	/* JF this will have to be moved on any system that
a39116f1	278	does not support removal of open files. */
6efd877d KR	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);
	283	f_in = f_out;
	284	}
fecd2382 RP	285	#endif
fecd2382 RP	286	}
6efd877d	287
fecd2382 RP	288	#endif
	289
	290	/* Close input file. */
6efd877d KR	291	void
	292	input_file_close ()
	293	{
	294	if (f_in != NULL)
	295	{
	296	fclose (f_in);
	297	} /* don't close a null file pointer */
	298	f_in = 0;
	299	} /* input_file_close() */
fecd2382 RP	300
fecd2382 RP	301	char *
6efd877d KR	302	input_file_give_next_buffer (where)
6efd877d KR	303	char where; / Where to place 1st character of new buffer. */
fecd2382	304	{
6efd877d KR	305	char return_value; / -> Last char of what we read, + 1. */
	306	register int size;
	307
	308	if (f_in == (FILE *) 0)
	309	return 0;
	310	/*
a39116f1 RP	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.
	315	*/
6efd877d KR	316	if (preprocess)
	317	{
	318	char *p;
	319	int n;
	320	int ch;
	321	extern FILE *scrub_file;
	322
	323	scrub_file = f_in;
	324	for (p = where, n = BUFFER_SIZE; n; --n)
	325	{
	326
	327	ch = do_scrub_next_char (scrub_from_file, scrub_to_file);
	328	if (ch == EOF)
	329	break;
	330	*p++ = ch;
	331	}
	332	size = BUFFER_SIZE - n;
	333	}
	334	else
	335	size = fread (where, sizeof (char), BUFFER_SIZE, f_in);
	336	if (size < 0)
	337	{
	338	as_perror ("Can't read from %s", file_name);
	339	size = 0;
	340	}
	341	if (size)
	342	return_value = where + size;
	343	else
	344	{
	345	if (fclose (f_in))
	346	as_perror ("Can't close %s", file_name);
	347	f_in = (FILE *) 0;
	348	return_value = 0;
	349	}
	350	return (return_value);
fecd2382	351	}
8b228fe9 RP	352
8b228fe9 RP	353	/* end of input-file.c */