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/* input_scrub.c - layer between app and the rest of the world
Copyright (C) 1987 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. */
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <libc.h>
#ifdef NeXT /* .include feature */
#include <sys/file.h>
#include <sys/param.h>
#endif /* NeXT .include feature */
#include "as.h"
#include "read.h"
#include "input-file.h"
#include "input-scrub.h"
#include "app.h"
#include "xmalloc.h"
#include "messages.h"
/*
* O/S independent module to supply buffers of sanitised source code
* to rest of assembler. We get raw input data of some length.
* Also looks after line numbers, for e.g. error messages.
* This module used to do the sanitising, but now a pre-processor program
* (app) does that job so this module is degenerate.
* Now input is pre-sanitised, so we only worry about finding the
* last partial line. A buffer of full lines is returned to caller.
* The last partial line begins the next buffer we build and return to caller.
* The buffer returned to caller is preceeded by BEFORE_STRING and followed
* by AFTER_STRING. The last character before AFTER_STRING is a newline.
*/
/*
* We expect the following sanitation has already been done.
*
* No comments, reduce a comment to a space.
* Reduce a tab to a space unless it is 1st char of line.
* All multiple tabs and spaces collapsed into 1 char. Tab only
* legal if 1st char of line.
* # line file statements converted to .line x;.file y; statements.
* Escaped newlines at end of line: remove them but add as many newlines
* to end of statement as you removed in the middle, to synch line numbers.
*/
#define BEFORE_STRING ("\n")
#define AFTER_STRING ("\0") /* memcpy of 0 chars might choke. */
#define BEFORE_SIZE (1)
#define AFTER_SIZE (1) /* includes the \0 */
static char * buffer_start; /* -> 1st char of full buffer area. */
static char * partial_where; /* -> after last full line in buffer. */
static int partial_size; /* >=0. Number of chars in partial line in buffer. */
static char save_source [AFTER_SIZE];
/* Because we need AFTER_STRING just after last */
/* full line, it clobbers 1st part of partial */
/* line. So we preserve 1st part of partial */
/* line here. */
static int buffer_length; /* What is the largest size buffer that */
/* input_file_give_next_buffer() could */
/* return to us? */
/*
We never have more than one source file open at once.
We may, however, read more than 1 source file in an assembly.
NULL means we have no file open right now.
*/
/*
We must track the physical file and line number for error messages.
We also track a "logical" file and line number corresponding to (C?)
compiler source line numbers.
Whenever we open a file we must fill in physical_input_file. So if it is NULL
we have not opened any files yet.
*/
int doing_include = FALSE; /* TRUE when we are processing a .include */
char *physical_input_file = NULL;
char *logical_input_file = NULL;
line_numberT physical_input_line = 0;
line_numberT logical_input_line = 0;
void
input_scrub_begin(
void)
{
know( strlen(BEFORE_STRING) == BEFORE_SIZE );
know( strlen(AFTER_STRING) + 1 == AFTER_SIZE );
input_file_begin ();
buffer_length = input_file_buffer_size ();
buffer_start = xmalloc ((long)(BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE));
memcpy(buffer_start, BEFORE_STRING, (int)BEFORE_SIZE);
/* Line number things. */
logical_input_line = 0;
logical_input_file = (char *)NULL;
physical_input_file = NULL; /* No file read yet. */
do_scrub_begin();
}
void
input_scrub_end(
void)
{
input_file_end ();
}
char * /* Return start of caller's part of buffer. */
input_scrub_new_file(
char *filename)
{
input_file_open (filename, !flagseen['f']);
physical_input_file = filename[0] ? filename : "{standard input}";
physical_input_line = 0;
partial_size = 0;
return (buffer_start + BEFORE_SIZE);
}
char *
input_scrub_next_buffer(
char **bufp)
{
register char * limit; /* -> just after last char of buffer. */
if (partial_size)
{
memcpy(buffer_start + BEFORE_SIZE, partial_where, (int)partial_size);
memcpy(buffer_start + BEFORE_SIZE, save_source, (int)AFTER_SIZE);
}
limit = input_file_give_next_buffer (buffer_start + BEFORE_SIZE + partial_size);
if (limit)
{
register char * p; /* Find last newline. */
for (p = limit; * -- p != '\n'; )
{
}
++ p;
if (p <= buffer_start + BEFORE_SIZE)
{
as_fatal ("Source line too long. Please change file %s then rebuild assembler.", __FILE__);
}
partial_where = p;
partial_size = limit - p;
memcpy(save_source, partial_where, (int)AFTER_SIZE);
memcpy(partial_where, AFTER_STRING, (int)AFTER_SIZE);
}
else
{
partial_where = 0;
if (partial_size > 0)
{
as_warn( "Partial line at end of file ignored" );
}
}
return (partial_where);
}
/*
* The remaining part of this file deals with line numbers, error
* messages and so on.
*/
/*
* seen_at_least_1_file() returns TRUE if we opened any file.
*/
int
seen_at_least_1_file(
void)
{
return (physical_input_file != NULL);
}
void
bump_line_counters(
void)
{
++ physical_input_line;
++ logical_input_line;
}
/*
* new_logical_line()
*
* Tells us what the new logical line number and file are.
* If the line_number is <0, we don't change the current logical line number.
* If the fname is NULL, we don't change the current logical file name.
*/
void
new_logical_line(
char *fname, /* DON'T destroy it! We point to it! */
int line_number)
{
if ( fname )
{
logical_input_file = fname;
}
if ( line_number >= 0 )
{
logical_input_line = line_number;
}
}
/*
* a s _ w h e r e ( )
*
* Write a line to stderr locating where we are in reading
* input source files.
* As a sop to the debugger of AS, pretty-print the offending line.
*/
void
as_where(
void)
{
char *p;
line_numberT line;
if (physical_input_file)
{ /* we tried to read SOME source */
if (input_file_is_open())
{ /* we can still read lines from source */
p = logical_input_file ? logical_input_file : physical_input_file;
line = logical_input_line ? logical_input_line : physical_input_line;
fprintf(stderr,"%s:%u:", p, line);
}
else
{
p = logical_input_file ? logical_input_file : physical_input_file;
line = logical_input_line ? logical_input_line : physical_input_line;
fprintf (stderr,"%s:unknown:", p);
}
}
else
{
}
}
/*
* a s _ p e r r o r
*
* Like perror(3), but with more info.
*/
void
as_perror(
char *gripe, /* Unpunctuated error theme. */
char *filename)
{
fprintf (stderr,"as:file(%s) %s! ",
filename, gripe
);
if (errno > sys_nerr)
{
fprintf (stderr, "Unknown error #%d.", errno);
}
else
{
fprintf (stderr, "%s.", sys_errlist [errno]);
}
(void)putc('\n', stderr);
errno = 0; /* After reporting, clear it. */
if (input_file_is_open()) /* RMS says don't mention line # if not needed. */
{
as_where();
}
}
#ifdef NeXT /* .include feature */
/* DJA -- added for .include pseudo op support */
void
read_an_include_file(
char *no_path_name)
{
char * buffer;
char * last_buffer_limit;
char * last_buffer_start;
int last_doing_include;
FILE * last_f_in;
char * last_file_name;
char * last_input_line_pointer;
char * last_logical_input_file;
line_numberT last_logical_input_line;
int last_partial_size;
char * last_partial_where;
char * last_physical_input_file;
line_numberT last_physical_input_line;
char last_save_source [AFTER_SIZE];
#if 0
char * last_save_buffer;
#endif
char name_buffer [MAXPATHLEN];
scrub_context_data scrub_context;
register struct directory_stack * the_path_pointer;
register char * whole_file_name;
/*
* figure out what directory the file name is in.
*/
whole_file_name = no_path_name;
if (access(whole_file_name, R_OK))
{
whole_file_name = name_buffer;
the_path_pointer = include;
while (the_path_pointer)
{
if (strlen (the_path_pointer->fname) + (strlen (no_path_name)) >= MAXPATHLEN)
as_warn ("include file name too long: \"%s%s\"", the_path_pointer->fname, no_path_name);
else
{
*whole_file_name = '\0';
strcpy (whole_file_name, the_path_pointer->fname);
strcat (whole_file_name, "/");
strcat (whole_file_name, no_path_name);
if (!access(whole_file_name, R_OK))
goto found;
}
the_path_pointer = the_path_pointer->next;
}
the_path_pointer = include_defaults;
while (the_path_pointer->fname != NULL)
{
if (strlen (the_path_pointer->fname) + (strlen (no_path_name)) >= MAXPATHLEN)
as_warn ("include file name too long: \"%s%s\"", the_path_pointer->fname, no_path_name);
else
{
*whole_file_name = '\0';
strcpy (whole_file_name, the_path_pointer->fname);
strcat (whole_file_name, "/");
strcat (whole_file_name, no_path_name);
if (!access(whole_file_name, R_OK))
goto found;
}
the_path_pointer++;
}
as_fatal ("Couldn't find the include file: \"%s\"", no_path_name);
return;
}
found:
/*
* save a copy of the file state for a recursive call to read a file
*/
last_buffer_limit = buffer_limit;
last_buffer_start = buffer_start;
last_doing_include = doing_include;
last_f_in = f_in;
last_file_name = file_name;
last_input_line_pointer = input_line_pointer;
last_logical_input_file = logical_input_file;
last_logical_input_line = logical_input_line;
last_partial_size = partial_size;
last_partial_where = partial_where;
last_physical_input_file = physical_input_file;
last_physical_input_line = physical_input_line;
memcpy(last_save_source, save_source, sizeof (save_source));
save_scrub_context (&scrub_context);
/*
* set up for another file
*/
partial_size = 0;
doing_include = TRUE;
input_scrub_begin ();
buffer = input_scrub_new_file (whole_file_name);
if (f_in != (FILE *)0)
read_a_source_file(buffer);
xfree (buffer_start);
/*
* restore the file state
*/
buffer_limit = last_buffer_limit;
buffer_start = last_buffer_start;
doing_include = last_doing_include;
f_in = last_f_in;
file_name = last_file_name;
input_line_pointer = last_input_line_pointer;
logical_input_file = last_logical_input_file;
logical_input_line = last_logical_input_line;
partial_size = last_partial_size;
partial_where = last_partial_where;
physical_input_file = last_physical_input_file;
physical_input_line = last_physical_input_line;
memcpy(save_source, last_save_source, sizeof (save_source));
restore_scrub_context (&scrub_context);
} /* read_an_include_file */
#endif /* NeXT .include feature */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.