b1520b1f70
* input-scrub.c (input_scrub_push): call input_file_begin, not input_scrub_begin. messages.c (as_perror): print ": " between the passed in error and the strerror, like perror does.
449 lines
13 KiB
C
449 lines
13 KiB
C
/* input_scrub.c - Break up input buffers into whole numbers of lines.
|
||
Copyright (C) 1987, 1990, 1991, 1992 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. */
|
||
|
||
#include <errno.h> /* Need this to make errno declaration right */
|
||
#include "as.h"
|
||
#include "input-file.h"
|
||
|
||
/*
|
||
* O/S independent module to supply buffers of sanitised source code
|
||
* to rest of assembler. We get sanitized input data of arbitrary length.
|
||
* We break these buffers on line boundaries, recombine pieces that
|
||
* were broken across buffers, and return a buffer of full lines to
|
||
* the 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, as sentinels. The last character before AFTER_STRING
|
||
* is a newline.
|
||
* Also looks after line numbers, for e.g. error messages.
|
||
*/
|
||
|
||
/*
|
||
* We don't care how filthy our buffers are, but our callers assume
|
||
* that 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)
|
||
|
||
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? */
|
||
|
||
/* Saved information about the file that .include'd this one. When we hit EOF,
|
||
we automatically pop to that file. */
|
||
|
||
static char *next_saved_file;
|
||
|
||
/* We can have more than one source file open at once, though the info for all
|
||
but the latest one are saved off in a struct input_save. These files remain
|
||
open, so we are limited by the number of open files allowed by the
|
||
underlying OS. We may also sequentially read more than one source file in an
|
||
assembly. */
|
||
|
||
/* 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. */
|
||
|
||
char *physical_input_file;
|
||
char *logical_input_file;
|
||
|
||
typedef unsigned int line_numberT; /* 1-origin line number in a source file. */
|
||
/* A line ends in '\n' or eof. */
|
||
|
||
line_numberT physical_input_line;
|
||
line_numberT logical_input_line;
|
||
|
||
/* Struct used to save the state of the input handler during include files */
|
||
struct input_save {
|
||
char *buffer_start;
|
||
char *partial_where;
|
||
int partial_size;
|
||
char save_source [AFTER_SIZE];
|
||
int buffer_length;
|
||
char *physical_input_file;
|
||
char *logical_input_file;
|
||
line_numberT physical_input_line;
|
||
line_numberT logical_input_line;
|
||
char *next_saved_file; /* Chain of input_saves */
|
||
char *input_file_save; /* Saved state of input routines */
|
||
char *saved_position; /* Caller's saved position in buf */
|
||
};
|
||
|
||
#if __STDC__ == 1
|
||
static void as_1_char(unsigned int c, FILE *stream);
|
||
#else /* __STDC__ */
|
||
static void as_1_char();
|
||
#endif /* not __STDC__ */
|
||
|
||
/* Push the state of input reading and scrubbing so that we can #include.
|
||
The return value is a 'void *' (fudged for old compilers) to a save
|
||
area, which can be restored by passing it to input_scrub_pop(). */
|
||
char *input_scrub_push(saved_position)
|
||
char *saved_position;
|
||
{
|
||
register struct input_save *saved;
|
||
|
||
saved = (struct input_save *) xmalloc(sizeof *saved);
|
||
|
||
saved->saved_position = saved_position;
|
||
saved->buffer_start = buffer_start;
|
||
saved->partial_where = partial_where;
|
||
saved->partial_size = partial_size;
|
||
saved->buffer_length = buffer_length;
|
||
saved->physical_input_file = physical_input_file;
|
||
saved->logical_input_file = logical_input_file;
|
||
saved->physical_input_line = physical_input_line;
|
||
saved->logical_input_line = logical_input_line;
|
||
memcpy(saved->save_source, save_source, sizeof(save_source));
|
||
saved->next_saved_file = next_saved_file;
|
||
saved->input_file_save = input_file_push();
|
||
|
||
input_file_begin(); /* Reinitialize! */
|
||
logical_input_line = 0;
|
||
logical_input_file = (char *)NULL;
|
||
|
||
return((char *) saved);
|
||
} /* input_scrub_push() */
|
||
|
||
char *
|
||
input_scrub_pop (arg)
|
||
char *arg;
|
||
{
|
||
register struct input_save *saved;
|
||
char *saved_position;
|
||
|
||
input_scrub_end (); /* Finish off old buffer */
|
||
|
||
saved = (struct input_save *)arg;
|
||
|
||
input_file_pop (saved->input_file_save);
|
||
saved_position = saved->saved_position;
|
||
buffer_start = saved->buffer_start;
|
||
buffer_length = saved->buffer_length;
|
||
physical_input_file = saved->physical_input_file;
|
||
logical_input_file = saved->logical_input_file;
|
||
physical_input_line = saved->physical_input_line;
|
||
logical_input_line = saved->logical_input_line;
|
||
partial_where = saved->partial_where;
|
||
partial_size = saved->partial_size;
|
||
next_saved_file = saved->next_saved_file;
|
||
memcpy(save_source, saved->save_source, sizeof (save_source));
|
||
|
||
free(arg);
|
||
return saved_position;
|
||
}
|
||
|
||
|
||
void
|
||
input_scrub_begin ()
|
||
{
|
||
know(strlen(BEFORE_STRING) == BEFORE_SIZE);
|
||
know(strlen(AFTER_STRING) == AFTER_SIZE || (AFTER_STRING[0] == '\0' && AFTER_SIZE == 1));
|
||
|
||
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. */
|
||
next_saved_file = NULL; /* At EOF, don't pop to any other file */
|
||
do_scrub_begin();
|
||
}
|
||
|
||
void
|
||
input_scrub_end ()
|
||
{
|
||
if (buffer_start)
|
||
{
|
||
free (buffer_start);
|
||
buffer_start = 0;
|
||
input_file_end ();
|
||
}
|
||
}
|
||
|
||
/* Start reading input from a new file. */
|
||
|
||
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);
|
||
}
|
||
|
||
|
||
/* Include a file from the current file. Save our state, cause it to
|
||
be restored on EOF, and begin handling a new file. Same result as
|
||
input_scrub_new_file. */
|
||
|
||
char *
|
||
input_scrub_include_file (filename, position)
|
||
char *filename;
|
||
char *position;
|
||
{
|
||
next_saved_file = input_scrub_push(position);
|
||
return input_scrub_new_file (filename);
|
||
}
|
||
|
||
void
|
||
input_scrub_close ()
|
||
{
|
||
input_file_close ();
|
||
}
|
||
char *
|
||
input_scrub_next_buffer (bufp)
|
||
char **bufp;
|
||
{
|
||
register char * limit; /*->just after last char of buffer. */
|
||
|
||
*bufp = buffer_start + BEFORE_SIZE;
|
||
|
||
#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)
|
||
memcpy(partial_where, save_source, (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;
|
||
memcpy(save_source, partial_where, (int) AFTER_SIZE);
|
||
memcpy(partial_where, AFTER_STRING, (int) AFTER_SIZE);
|
||
|
||
save_buffer = *bufp;
|
||
*bufp = out_string;
|
||
|
||
return partial_where;
|
||
}
|
||
|
||
/* We're not preprocessing. Do the right thing */
|
||
#endif
|
||
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");
|
||
}
|
||
/* If we should pop to another file at EOF, do it. */
|
||
if (next_saved_file) {
|
||
*bufp = input_scrub_pop (next_saved_file); /* Pop state */
|
||
/* partial_where is now correct to return, since we popped it. */
|
||
}
|
||
}
|
||
return(partial_where);
|
||
} /* input_scrub_next_buffer() */
|
||
|
||
/*
|
||
* 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; FIXME-now remove this. */
|
||
}
|
||
|
||
/*
|
||
* 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 we have a file name */
|
||
|
||
if (line_number >= 0) {
|
||
logical_input_line = line_number;
|
||
} /* if we have a line number */
|
||
} /* new_logical_line() */
|
||
|
||
/*
|
||
* 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 (logical_input_file && (logical_input_line > 0)) {
|
||
p = logical_input_file;
|
||
line = logical_input_line;
|
||
} else {
|
||
p = physical_input_file;
|
||
line = physical_input_line;
|
||
} /* line number should match file name */
|
||
|
||
fprintf(stderr, "%s:%u: ", p, line);
|
||
|
||
#ifdef DONTDEF
|
||
if (physical_input_file) {
|
||
if (input_file_is_open()) { /* we can still read lines from source */
|
||
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 {
|
||
fprintf(stderr, " After reading source.\n");
|
||
} /* input file is still open */
|
||
} else {
|
||
fprintf(stderr, " Before reading source.\n");
|
||
} /* we tried to read SOME source */
|
||
#endif /* DONTDEF */
|
||
|
||
return;
|
||
} /* as_where() */
|
||
|
||
|
||
|
||
|
||
/*
|
||
* 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 int c;
|
||
FILE *stream;
|
||
{
|
||
if (c > 127)
|
||
{
|
||
(void)putc('%', stream);
|
||
c -= 128;
|
||
}
|
||
if (c < 32)
|
||
{
|
||
(void)putc('^', stream);
|
||
c += '@';
|
||
}
|
||
(void)putc(c, stream);
|
||
}
|
||
|
||
/*
|
||
* Local Variables:
|
||
* comment-column: 0
|
||
* fill-column: 131
|
||
* End:
|
||
*/
|
||
|
||
/* end of input_scrub.c */
|