428 lines
11 KiB
C
428 lines
11 KiB
C
/*-
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* This code is derived from software copyrighted by the Free Software
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* Foundation.
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*
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* Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)input-scrub.c 6.4 (Berkeley) 5/8/91";
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#endif /* not lint */
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/* input_scrub.c - layer between app and the rest of the world
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Copyright (C) 1987 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "as.h"
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#include "read.h"
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#include "input-file.h"
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/*
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* O/S independent module to supply buffers of sanitised source code
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* to rest of assembler. We get raw input data of some length.
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* Also looks after line numbers, for e.g. error messages.
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* This module used to do the sanitising, but now a pre-processor program
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* (app) does that job so this module is degenerate.
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* Now input is pre-sanitised, so we only worry about finding the
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* last partial line. A buffer of full lines is returned to caller.
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* The last partial line begins the next buffer we build and return to caller.
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* The buffer returned to caller is preceeded by BEFORE_STRING and followed
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* by AFTER_STRING. The last character before AFTER_STRING is a newline.
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*/
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/*
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* We expect the following sanitation has already been done.
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*
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* No comments, reduce a comment to a space.
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* Reduce a tab to a space unless it is 1st char of line.
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* All multiple tabs and spaces collapsed into 1 char. Tab only
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* legal if 1st char of line.
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* # line file statements converted to .line x;.file y; statements.
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* Escaped newlines at end of line: remove them but add as many newlines
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* to end of statement as you removed in the middle, to synch line numbers.
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*/
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#define BEFORE_STRING ("\n")
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#define AFTER_STRING ("\0") /* bcopy of 0 chars might choke. */
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#define BEFORE_SIZE (1)
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#define AFTER_SIZE (1)
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static char * buffer_start; /* -> 1st char of full buffer area. */
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static char * partial_where; /* -> after last full line in buffer. */
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static int partial_size; /* >=0. Number of chars in partial line in buffer. */
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static char save_source [AFTER_SIZE];
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/* Because we need AFTER_STRING just after last */
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/* full line, it clobbers 1st part of partial */
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/* line. So we preserve 1st part of partial */
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/* line here. */
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static int buffer_length; /* What is the largest size buffer that */
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/* input_file_give_next_buffer() could */
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/* return to us? */
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static void as_1_char ();
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/*
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We never have more than one source file open at once.
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We may, however, read more than 1 source file in an assembly.
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NULL means we have no file open right now.
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*/
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/*
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We must track the physical file and line number for error messages.
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We also track a "logical" file and line number corresponding to (C?)
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compiler source line numbers.
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Whenever we open a file we must fill in physical_input_file. So if it is NULL
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we have not opened any files yet.
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*/
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static
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char * physical_input_file,
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* logical_input_file;
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typedef unsigned int line_numberT; /* 1-origin line number in a source file. */
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/* A line ends in '\n' or eof. */
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static
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line_numberT physical_input_line,
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logical_input_line;
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void
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input_scrub_begin ()
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{
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know( strlen(BEFORE_STRING) == BEFORE_SIZE );
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know( strlen( AFTER_STRING) == AFTER_SIZE );
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input_file_begin ();
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buffer_length = input_file_buffer_size ();
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buffer_start = xmalloc ((long)(BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE));
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bcopy (BEFORE_STRING, buffer_start, (int)BEFORE_SIZE);
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/* Line number things. */
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logical_input_line = 0;
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logical_input_file = (char *)NULL;
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physical_input_file = NULL; /* No file read yet. */
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do_scrub_begin();
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}
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void
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input_scrub_end ()
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{
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input_file_end ();
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}
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char * /* Return start of caller's part of buffer. */
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input_scrub_new_file (filename)
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char * filename;
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{
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input_file_open (filename, !flagseen['f']);
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physical_input_file = filename[0] ? filename : "{standard input}";
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physical_input_line = 0;
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partial_size = 0;
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return (buffer_start + BEFORE_SIZE);
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}
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char *
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input_scrub_next_buffer (bufp)
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char **bufp;
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{
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register char * limit; /* -> just after last char of buffer. */
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#ifdef DONTDEF
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if(preprocess) {
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if(save_buffer) {
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*bufp = save_buffer;
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save_buffer = 0;
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}
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limit = input_file_give_next_buffer(buffer_start+BEFORE_SIZE);
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if (!limit) {
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partial_where = 0;
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if(partial_size)
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as_warn("Partial line at end of file ignored");
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return partial_where;
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}
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if(partial_size)
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bcopy(save_source, partial_where,(int)AFTER_SIZE);
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do_scrub(partial_where,partial_size,buffer_start+BEFORE_SIZE,limit-(buffer_start+BEFORE_SIZE),&out_string,&out_length);
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limit=out_string + out_length;
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for(p=limit;*--p!='\n';)
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;
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p++;
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if(p<=buffer_start+BEFORE_SIZE)
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as_fatal("Source line too long. Please change file '%s' and re-make the assembler.",__FILE__);
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partial_where = p;
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partial_size = limit-p;
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bcopy(partial_where, save_source,(int)AFTER_SIZE);
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bcopy(AFTER_STRING, partial_where, (int)AFTER_SIZE);
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save_buffer = *bufp;
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*bufp = out_string;
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return partial_where;
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}
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/* We're not preprocessing. Do the right thing */
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#endif
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if (partial_size)
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{
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bcopy (partial_where, buffer_start + BEFORE_SIZE, (int)partial_size);
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bcopy (save_source, buffer_start + BEFORE_SIZE, (int)AFTER_SIZE);
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}
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limit = input_file_give_next_buffer (buffer_start + BEFORE_SIZE + partial_size);
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if (limit)
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{
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register char * p; /* Find last newline. */
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for (p = limit; * -- p != '\n'; )
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{
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}
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++ p;
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if (p <= buffer_start + BEFORE_SIZE)
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{
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as_fatal ("Source line too long. Please change file %s then rebuild assembler.", __FILE__);
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}
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partial_where = p;
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partial_size = limit - p;
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bcopy (partial_where, save_source, (int)AFTER_SIZE);
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bcopy (AFTER_STRING, partial_where, (int)AFTER_SIZE);
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}
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else
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{
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partial_where = 0;
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if (partial_size > 0)
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{
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as_warn( "Partial line at end of file ignored" );
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}
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}
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return (partial_where);
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}
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/*
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* The remaining part of this file deals with line numbers, error
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* messages and so on.
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*/
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int
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seen_at_least_1_file () /* TRUE if we opened any file. */
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{
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return (physical_input_file != NULL);
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}
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void
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bump_line_counters ()
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{
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++ physical_input_line;
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++ logical_input_line;
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}
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/*
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* new_logical_line()
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*
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* Tells us what the new logical line number and file are.
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* If the line_number is <0, we don't change the current logical line number.
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* If the fname is NULL, we don't change the current logical file name.
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*/
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void
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new_logical_line (fname, line_number)
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char * fname; /* DON'T destroy it! We point to it! */
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int line_number;
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{
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if ( fname )
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{
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logical_input_file = fname;
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}
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if ( line_number >= 0 )
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{
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logical_input_line = line_number;
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}
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}
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/*
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* a s _ w h e r e ( )
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*
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* Write a line to stderr locating where we are in reading
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* input source files.
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* As a sop to the debugger of AS, pretty-print the offending line.
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*/
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void
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as_where()
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{
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char *p;
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line_numberT line;
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if (physical_input_file)
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{ /* we tried to read SOME source */
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if (input_file_is_open())
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{ /* we can still read lines from source */
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#ifdef DONTDEF
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fprintf (stderr," @ physical line %ld., file \"%s\"",
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(long) physical_input_line, physical_input_file);
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fprintf (stderr," @ logical line %ld., file \"%s\"\n",
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(long) logical_input_line, logical_input_file);
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(void)putc(' ', stderr);
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as_howmuch (stderr);
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(void)putc('\n', stderr);
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#else
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p = logical_input_file ? logical_input_file : physical_input_file;
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line = logical_input_line ? logical_input_line : physical_input_line;
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fprintf(stderr,"%s:%u:", p, line);
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#endif
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}
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else
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{
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#ifdef DONTDEF
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fprintf (stderr," After reading source.\n");
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#else
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p = logical_input_file ? logical_input_file : physical_input_file;
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line = logical_input_line ? logical_input_line : physical_input_line;
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fprintf (stderr,"%s:unknown:", p);
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#endif
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}
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}
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else
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{
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#ifdef DONTDEF
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fprintf (stderr," Before reading source.\n");
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#else
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#endif
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}
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}
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/*
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* Support for source file debugging. These functions handle
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* logical lines and logical files.
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*/
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static char *saved_file;
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static int saved_len;
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static line_numberT saved_line;
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void
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filestab()
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{
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char *file;
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int len;
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if (!physical_input_file ||
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!input_file_is_open())
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return;
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file = logical_input_file ? logical_input_file : physical_input_file;
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if (saved_file == 0 || strcmp(file, saved_file) != 0)
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{
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stabs(file);
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len = strlen(file) + 1;
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if (len > saved_len)
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{
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if (saved_file == 0)
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saved_file = xmalloc(len);
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else
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saved_file = xrealloc(saved_file, len);
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memcpy(saved_file, file, len);
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saved_len = len;
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}
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else
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strcpy(saved_file, file);
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saved_line = 0;
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}
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}
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void
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funcstab(func)
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char *func;
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{
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if (now_seg != SEG_TEXT)
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return;
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filestab();
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stabf(func);
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}
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void
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linestab()
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{
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line_numberT line;
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if (now_seg != SEG_TEXT)
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return;
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filestab();
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line = logical_input_line ? logical_input_line : physical_input_line;
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if (saved_line == 0 || line != saved_line)
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{
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stabd(line);
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saved_line = line;
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}
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}
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/*
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* a s _ h o w m u c h ( )
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*
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* Output to given stream how much of line we have scanned so far.
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* Assumes we have scanned up to and including input_line_pointer.
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* No free '\n' at end of line.
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*/
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void
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as_howmuch (stream)
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FILE * stream; /* Opened for write please. */
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{
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register char * p; /* Scan input line. */
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/* register char c; JF unused */
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for (p = input_line_pointer - 1; * p != '\n'; --p)
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{
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}
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++ p; /* p -> 1st char of line. */
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for (; p <= input_line_pointer; p++)
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{
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/* Assume ASCII. EBCDIC & other micro-computer char sets ignored. */
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/* c = *p & 0xFF; JF unused */
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as_1_char (*p, stream);
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}
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}
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static void
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as_1_char (c,stream)
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unsigned char c;
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FILE * stream;
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{
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if ( c > 127 )
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{
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(void)putc( '%', stream);
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c -= 128;
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}
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if ( c < 32 )
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{
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(void)putc( '^', stream);
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c += '@';
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}
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(void)putc( c, stream);
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}
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/* end: input_scrub.c */
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