[deliverable/binutils-gdb.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 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;
	}
	
#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() {
	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 RP	1	/* input_file.c - Deal with Input Files -
fecd2382 RP	2	Copyright (C) 1987, 1990, 1991 Free Software Foundation, Inc.
a39116f1 RP	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 2, 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. */
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 */
	59	char * file_name;
	60
	61	/* Struct for saving the state of this module for file includes. */
	62	struct saved_file {
a39116f1 RP	63	FILE *f_in;
	64	char *file_name;
	65	int preprocess;
	66	char *app_save;
fecd2382 RP	67	};
	68	\f
	69	/* These hooks accomodate most operating systems. */
	70
	71	void input_file_begin() {
a39116f1	72	f_in = (FILE *)0;
fecd2382 RP	73	}
	74
	75	void input_file_end () { }
	76
a39116f1	77	/* Return BUFFER_SIZE. */
fecd2382	78	int input_file_buffer_size() {
a39116f1	79	return (BUFFER_SIZE);
fecd2382 RP	80	}
	81
	82	int input_file_is_open() {
a39116f1	83	return f_in!=(FILE *)0;
fecd2382 RP	84	}
	85
	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 () {
a39116f1 RP	89	register struct saved_file *saved;
	90
	91	saved = (struct saved_file )xmalloc (sizeof saved);
	92
	93	saved->f_in = f_in;
	94	saved->file_name = file_name;
	95	saved->preprocess = preprocess;
	96	if (preprocess)
	97	saved->app_save = app_push ();
	98
	99	input_file_begin (); /* Initialize for new file */
	100
	101	return (char *)saved;
fecd2382 RP	102	}
	103
	104	void
a39116f1 RP	105	input_file_pop (arg)
a39116f1 RP	106	char *arg;
fecd2382	107	{
a39116f1 RP	108	register struct saved_file saved = (struct saved_file )arg;
	109
	110	input_file_end (); /* Close out old file */
	111
	112	f_in = saved->f_in;
	113	file_name = saved->file_name;
	114	preprocess = saved->preprocess;
	115	if (preprocess)
	116	app_pop (saved->app_save);
	117
	118	free(arg);
fecd2382 RP	119	}
	120	\f
	121	#ifdef DONTDEF /* JF save old version in case we need it */
	122	void
a39116f1 RP	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. */
fecd2382	127	{
a39116f1 RP	128	assert( filename != 0 ); /* Filename may not be NULL. */
	129	if (filename [0])
	130	{ /* We have a file name. Suck it and see. */
	131	file_handle = open (filename, O_RDONLY, 0);
	132	file_name = filename;
fecd2382	133	}
a39116f1 RP	134	else
	135	{ /* use stdin for the input file. */
	136	file_handle = fileno (stdin);
	137	file_name = "{standard input}"; /* For error messages. */
	138	}
	139	if (file_handle < 0)
	140	as_perror ("Can't open %s for reading", file_name);
	141	if ( preprocess )
	142	{
	143	/*
	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.
	147	*/
	148	int pid;
	149	char temporary_file_name [12];
	150	int fd;
	151	union wait status;
	152
	153	(void)strcpy (temporary_file_name, "#appXXXXXX");
	154	(void)mktemp (temporary_file_name);
	155	pid = vfork ();
	156	if (pid == -1)
	157	{
	158	as_perror ("Vfork failed", file_name);
	159	_exit (144);
	160	}
	161	if (pid == 0)
	162	{
	163	(void)dup2 (file_handle, fileno(stdin));
	164	fd = open (temporary_file_name, O_WRONLY + O_TRUNC + O_CREAT, 0666);
	165	if (fd == -1)
	166	{
	167	(void)write(2,"Can't open temporary\n",21);
	168	_exit (99);
	169	}
	170	(void)dup2 (fd, fileno(stdout));
	171	/* JF for testing #define PREPROCESSOR "/lib/app" */
fecd2382	172	#define PREPROCESSOR "./app"
a39116f1 RP	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);
	177	_exit (11);
	178	}
	179	(void)wait (& status);
	180	if (status.w_status & 0xFF00) /* JF was 0xF000, was wrong */
	181	{
	182	file_handle = -1;
	183	as_bad( "Can't preprocess file \"%s\", status = %xx", file_name, status.w_status );
	184	}
	185	else
	186	{
	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);
	190	}
	191	if (file_handle == -1)
	192	as_perror ("Can't retrieve temp file %s", temporary_file_name);
	193	}
fecd2382 RP	194	}
	195	#else
	196
	197	void
a39116f1 RP	198	input_file_open (filename,pre)
	199	char * filename; /* "" means use stdin. Must not be 0. */
	200	int pre;
fecd2382 RP	201	{
	202	int c;
	203	char buf[80];
a39116f1	204
fecd2382	205	preprocess = pre;
a39116f1	206
fecd2382 RP	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");
	210	file_name=filename;
	211	} else { /* use stdin for the input file. */
	212	f_in = stdin;
	213	file_name = "{standard input}"; /* For error messages. */
	214	}
	215	if (f_in==(FILE *)0) {
	216	as_perror ("Can't open %s for reading", file_name);
	217	return;
	218	}
a39116f1	219
fecd2382 RP	220	#ifndef VMS
	221	/* Ask stdio to buffer our input at BUFFER_SIZE, with a dynamically
	222	allocated buffer. */
	223	setvbuf(f_in, (char *)NULL, _IOFBF, BUFFER_SIZE);
	224	#endif /* VMS */
a39116f1	225
fecd2382 RP	226	c = getc(f_in);
	227	if (c == '#') { /* Begins with comment, may not want to preprocess */
	228	c = getc(f_in);
	229	if (c == 'N') {
	230	fgets(buf,80,f_in);
	231	if (!strcmp(buf,"O_APP\n"))
a39116f1	232	preprocess=0;
fecd2382	233	if (!strchr(buf,'\n'))
a39116f1	234	ungetc('#',f_in); /* It was longer */
fecd2382	235	else
a39116f1	236	ungetc('\n',f_in);
fecd2382	237	} else if(c=='\n')
a39116f1	238	ungetc('\n',f_in);
fecd2382	239	else
a39116f1	240	ungetc('#',f_in);
fecd2382	241	} else
a39116f1 RP	242	ungetc(c,f_in);
a39116f1 RP	243
fecd2382 RP	244	#ifdef DONTDEF
	245	if ( preprocess ) {
	246	char temporary_file_name [17];
	247	FILE *f_out;
a39116f1	248
fecd2382 RP	249	(void)strcpy (temporary_file_name, "/tmp/#appXXXXXX");
	250	(void)mktemp (temporary_file_name);
	251	f_out=fopen(temporary_file_name,"w+");
	252	if(f_out==(FILE *)0)
a39116f1 RP	253	as_perror("Can't open temp file %s",temporary_file_name);
	254
	255	/* JF this will have to be moved on any system that
	256	does not support removal of open files. */
fecd2382 RP	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 */
	260	(void)rewind(f_out);
	261	f_in=f_out;
	262	}
	263	#endif
	264	}
	265	#endif
	266
	267	/* Close input file. */
	268	void input_file_close() {
a39116f1 RP	269	if (f_in != NULL) {
	270	fclose (f_in);
	271	} /* don't close a null file pointer */
	272	f_in = 0;
	273	} /* input_file_close() */
fecd2382 RP	274
fecd2382 RP	275	char *
a39116f1 RP	276	input_file_give_next_buffer (where)
a39116f1 RP	277	char * where; /* Where to place 1st character of new buffer. */
fecd2382	278	{
a39116f1 RP	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);
fecd2382	322	}
8b228fe9 RP	323
8b228fe9 RP	324	/* end of input-file.c */