456 lines
13 KiB
C
456 lines
13 KiB
C
/* input_scrub.c - Break up input buffers into whole numbers of lines.
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Copyright (C) 1987, 1990, 1991, 1992 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 2, 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 <errno.h> /* Need this to make errno declaration right */
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#include "as.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 sanitized input data of arbitrary length.
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* We break these buffers on line boundaries, recombine pieces that
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* were broken across buffers, and return a buffer of full lines to
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* the 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, as sentinels. The last character before AFTER_STRING
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* is a newline.
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* Also looks after line numbers, for e.g. error messages.
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*/
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/*
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* We don't care how filthy our buffers are, but our callers assume
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* that 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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/* Saved information about the file that .include'd this one. When we hit EOF,
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we automatically pop to that file. */
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static char *next_saved_file;
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/* We can have more than one source file open at once, though the info for all
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but the latest one are saved off in a struct input_save. These files remain
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open, so we are limited by the number of open files allowed by the
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underlying OS. We may also sequentially read more than one source file in an
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assembly. */
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/* We must track the physical file and line number for error messages. We also
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track a "logical" file and line number corresponding to (C?) compiler
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source line numbers. Whenever we open a file we must fill in
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physical_input_file. So if it is NULL we have not opened any files yet. */
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char *physical_input_file;
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char *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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line_numberT physical_input_line;
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line_numberT logical_input_line;
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/* Struct used to save the state of the input handler during include files */
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struct input_save {
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char *buffer_start;
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char *partial_where;
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int partial_size;
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char save_source [AFTER_SIZE];
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int buffer_length;
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char *physical_input_file;
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char *logical_input_file;
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line_numberT physical_input_line;
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line_numberT logical_input_line;
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char *next_saved_file; /* Chain of input_saves */
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char *input_file_save; /* Saved state of input routines */
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char *saved_position; /* Caller's saved position in buf */
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};
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#if __STDC__ == 1
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static void as_1_char(unsigned int c, FILE *stream);
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#else /* __STDC__ */
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static void as_1_char();
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#endif /* not __STDC__ */
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/* Push the state of input reading and scrubbing so that we can #include.
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The return value is a 'void *' (fudged for old compilers) to a save
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area, which can be restored by passing it to input_scrub_pop(). */
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char *input_scrub_push(saved_position)
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char *saved_position;
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{
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register struct input_save *saved;
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saved = (struct input_save *) xmalloc(sizeof *saved);
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saved->saved_position = saved_position;
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saved->buffer_start = buffer_start;
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saved->partial_where = partial_where;
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saved->partial_size = partial_size;
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saved->buffer_length = buffer_length;
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saved->physical_input_file = physical_input_file;
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saved->logical_input_file = logical_input_file;
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saved->physical_input_line = physical_input_line;
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saved->logical_input_line = logical_input_line;
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bcopy(saved->save_source, save_source, sizeof(save_source));
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saved->next_saved_file = next_saved_file;
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saved->input_file_save = input_file_push();
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input_scrub_begin(); /* Reinitialize! */
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return((char *) saved);
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} /* input_scrub_push() */
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char *
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input_scrub_pop (arg)
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char *arg;
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{
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register struct input_save *saved;
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char *saved_position;
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input_scrub_end (); /* Finish off old buffer */
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saved = (struct input_save *)arg;
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input_file_pop (saved->input_file_save);
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saved_position = saved->saved_position;
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buffer_start = saved->buffer_start;
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buffer_length = saved->buffer_length;
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physical_input_file = saved->physical_input_file;
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logical_input_file = saved->logical_input_file;
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physical_input_line = saved->physical_input_line;
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logical_input_line = saved->logical_input_line;
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partial_where = saved->partial_where;
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partial_size = saved->partial_size;
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next_saved_file = saved->next_saved_file;
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bcopy (save_source, saved->save_source, sizeof (save_source));
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free(arg);
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return saved_position;
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}
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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 || (AFTER_STRING[0] == '\0' && AFTER_SIZE == 1));
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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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next_saved_file = NULL; /* At EOF, don't pop to any other file */
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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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if (buffer_start)
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{
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free (buffer_start);
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buffer_start = 0;
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input_file_end ();
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}
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}
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/* Start reading input from a new file. */
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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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/* Include a file from the current file. Save our state, cause it to
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be restored on EOF, and begin handling a new file. Same result as
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input_scrub_new_file. */
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char *
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input_scrub_include_file (filename, position)
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char *filename;
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char *position;
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{
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next_saved_file = input_scrub_push(position);
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return input_scrub_new_file (filename);
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}
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void
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input_scrub_close ()
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{
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input_file_close ();
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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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*bufp = buffer_start + BEFORE_SIZE;
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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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/* If we should pop to another file at EOF, do it. */
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if (next_saved_file)
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{
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*bufp = input_scrub_pop (next_saved_file); /* Pop state */
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/* partial_where is now correct to return, since we popped it. */
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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; FIXME-now remove this. */
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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 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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logical_input_file = fname;
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} /* if we have a file name */
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if (line_number >= 0) {
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logical_input_line = line_number;
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} /* if we have a line number */
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} /* new_logical_line() */
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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 as_where() {
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char *p;
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line_numberT line;
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if (logical_input_file && (logical_input_line > 0)) {
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p = logical_input_file;
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line = logical_input_line;
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} else {
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p = physical_input_file;
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line = physical_input_line;
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} /* line number should match file name */
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fprintf(stderr, "%s:%u: ", p, line);
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#ifdef DONTDEF
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if (physical_input_file) {
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if (input_file_is_open()) { /* we can still read lines from source */
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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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fprintf(stderr, " After reading source.\n");
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} /* input file is still open */
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} else {
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fprintf(stderr, " Before reading source.\n");
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} /* we tried to read SOME source */
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#endif /* DONTDEF */
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return;
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} /* as_where() */
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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 as_1_char (c,stream)
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unsigned int 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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/*
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* Local Variables:
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* comment-column: 0
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* fill-column: 131
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* End:
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*/
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/* end of input_scrub.c */
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