4.4BSD/usr/src/contrib/gas-1.38/input-scrub.c
/*-
* This code is derived from software copyrighted by the Free Software
* Foundation.
*
* Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
*/
#ifndef lint
static char sccsid[] = "@(#)input-scrub.c 6.4 (Berkeley) 5/8/91";
#endif /* not lint */
/* 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 "as.h"
#include "read.h"
#include "input-file.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") /* bcopy of 0 chars might choke. */
#define BEFORE_SIZE (1)
#define AFTER_SIZE (1)
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? */
static void as_1_char ();
/*
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.
*/
static
char * physical_input_file,
* logical_input_file;
typedef unsigned int line_numberT; /* 1-origin line number in a source file. */
/* A line ends in '\n' or eof. */
static
line_numberT physical_input_line,
logical_input_line;
void
input_scrub_begin ()
{
know( strlen(BEFORE_STRING) == BEFORE_SIZE );
know( strlen( AFTER_STRING) == AFTER_SIZE );
input_file_begin ();
buffer_length = input_file_buffer_size ();
buffer_start = xmalloc ((long)(BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE));
bcopy (BEFORE_STRING, buffer_start, (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 ()
{
input_file_end ();
}
char * /* Return start of caller's part of buffer. */
input_scrub_new_file (filename)
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 (bufp)
char **bufp;
{
register char * limit; /* -> just after last char of buffer. */
#ifdef DONTDEF
if(preprocess) {
if(save_buffer) {
*bufp = save_buffer;
save_buffer = 0;
}
limit = input_file_give_next_buffer(buffer_start+BEFORE_SIZE);
if (!limit) {
partial_where = 0;
if(partial_size)
as_warn("Partial line at end of file ignored");
return partial_where;
}
if(partial_size)
bcopy(save_source, partial_where,(int)AFTER_SIZE);
do_scrub(partial_where,partial_size,buffer_start+BEFORE_SIZE,limit-(buffer_start+BEFORE_SIZE),&out_string,&out_length);
limit=out_string + out_length;
for(p=limit;*--p!='\n';)
;
p++;
if(p<=buffer_start+BEFORE_SIZE)
as_fatal("Source line too long. Please change file '%s' and re-make the assembler.",__FILE__);
partial_where = p;
partial_size = limit-p;
bcopy(partial_where, save_source,(int)AFTER_SIZE);
bcopy(AFTER_STRING, partial_where, (int)AFTER_SIZE);
save_buffer = *bufp;
*bufp = out_string;
return partial_where;
}
/* We're not preprocessing. Do the right thing */
#endif
if (partial_size)
{
bcopy (partial_where, buffer_start + BEFORE_SIZE, (int)partial_size);
bcopy (save_source, buffer_start + BEFORE_SIZE, (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;
bcopy (partial_where, save_source, (int)AFTER_SIZE);
bcopy (AFTER_STRING, partial_where, (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.
*/
int
seen_at_least_1_file () /* TRUE if we opened any file. */
{
return (physical_input_file != NULL);
}
void
bump_line_counters ()
{
++ 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 (fname, line_number)
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()
{
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 */
#ifdef DONTDEF
fprintf (stderr," @ physical line %ld., file \"%s\"",
(long) physical_input_line, physical_input_file);
fprintf (stderr," @ logical line %ld., file \"%s\"\n",
(long) logical_input_line, logical_input_file);
(void)putc(' ', stderr);
as_howmuch (stderr);
(void)putc('\n', stderr);
#else
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);
#endif
}
else
{
#ifdef DONTDEF
fprintf (stderr," After reading source.\n");
#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);
#endif
}
}
else
{
#ifdef DONTDEF
fprintf (stderr," Before reading source.\n");
#else
#endif
}
}
/*
* Support for source file debugging. These functions handle
* logical lines and logical files.
*/
static char *saved_file;
static int saved_len;
static line_numberT saved_line;
void
filestab()
{
char *file;
int len;
if (!physical_input_file ||
!input_file_is_open())
return;
file = logical_input_file ? logical_input_file : physical_input_file;
if (saved_file == 0 || strcmp(file, saved_file) != 0)
{
stabs(file);
len = strlen(file) + 1;
if (len > saved_len)
{
if (saved_file == 0)
saved_file = xmalloc(len);
else
saved_file = xrealloc(saved_file, len);
memcpy(saved_file, file, len);
saved_len = len;
}
else
strcpy(saved_file, file);
saved_line = 0;
}
}
void
funcstab(func)
char *func;
{
if (now_seg != SEG_TEXT)
return;
filestab();
stabf(func);
}
void
linestab()
{
line_numberT line;
if (now_seg != SEG_TEXT)
return;
filestab();
line = logical_input_line ? logical_input_line : physical_input_line;
if (saved_line == 0 || line != saved_line)
{
stabd(line);
saved_line = line;
}
}
/*
* a s _ h o w m u c h ( )
*
* Output to given stream how much of line we have scanned so far.
* Assumes we have scanned up to and including input_line_pointer.
* No free '\n' at end of line.
*/
void
as_howmuch (stream)
FILE * stream; /* Opened for write please. */
{
register char * p; /* Scan input line. */
/* register char c; JF unused */
for (p = input_line_pointer - 1; * p != '\n'; --p)
{
}
++ p; /* p -> 1st char of line. */
for (; p <= input_line_pointer; p++)
{
/* Assume ASCII. EBCDIC & other micro-computer char sets ignored. */
/* c = *p & 0xFF; JF unused */
as_1_char (*p, stream);
}
}
static void
as_1_char (c,stream)
unsigned char c;
FILE * stream;
{
if ( c > 127 )
{
(void)putc( '%', stream);
c -= 128;
}
if ( c < 32 )
{
(void)putc( '^', stream);
c += '@';
}
(void)putc( c, stream);
}
/* end: input_scrub.c */