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-rw-r--r--binutils-2.17/gas/input-scrub.c477
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diff --git a/binutils-2.17/gas/input-scrub.c b/binutils-2.17/gas/input-scrub.c
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--- a/binutils-2.17/gas/input-scrub.c
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-/* input_scrub.c - Break up input buffers into whole numbers of lines.
- Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 2000, 2001, 2003
- 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, 51 Franklin Street - Fifth Floor, Boston, MA
- 02110-1301, USA. */
-
-#include <errno.h> /* Need this to make errno declaration right */
-#include "as.h"
-#include "input-file.h"
-#include "sb.h"
-#include "listing.h"
-
-/*
- * O/S independent module to supply buffers of sanitised source code
- * to rest of assembler. We get sanitised 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 preceded 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. */
-
-/* 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 char save_source[AFTER_SIZE];
-
-/* What is the largest size buffer that input_file_give_next_buffer()
- could return to us? */
-static unsigned int buffer_length;
-
-/* The index into an sb structure we are reading from. -1 if none. */
-static int sb_index = -1;
-
-/* If we are reading from an sb structure, this is it. */
-static sb from_sb;
-
-/* Should we do a conditional check on from_sb? */
-static int from_sb_is_expansion = 1;
-
-/* The number of nested sb structures we have included. */
-int macro_nest;
-
-/* 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. */
-
-static char *physical_input_file;
-static char *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;
-static int 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];
- unsigned int buffer_length;
- char * physical_input_file;
- char * logical_input_file;
- line_numberT physical_input_line;
- int logical_input_line;
- int sb_index;
- sb from_sb;
- int from_sb_is_expansion; /* Should we do a conditional check? */
- struct input_save * 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. */
-};
-
-static struct input_save *input_scrub_push (char *saved_position);
-static char *input_scrub_pop (struct input_save *arg);
-
-/* Saved information about the file that .include'd this one. When we hit EOF,
- we automatically pop to that file. */
-
-static struct input_save *next_saved_file;
-
-/* 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(). */
-
-static struct input_save *
-input_scrub_push (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;
- saved->sb_index = sb_index;
- saved->from_sb = from_sb;
- saved->from_sb_is_expansion = from_sb_is_expansion;
- 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 = -1;
- logical_input_file = (char *) NULL;
- buffer_length = input_file_buffer_size ();
- sb_index = -1;
-
- buffer_start = xmalloc ((BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE));
- memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE);
-
- return saved;
-}
-
-static char *
-input_scrub_pop (struct input_save *saved)
-{
- char *saved_position;
-
- input_scrub_end (); /* Finish off old buffer */
-
- 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;
- sb_index = saved->sb_index;
- from_sb = saved->from_sb;
- from_sb_is_expansion = saved->from_sb_is_expansion;
- 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 (saved);
- return saved_position;
-}
-
-void
-input_scrub_begin (void)
-{
- 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 ((BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE));
- memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE);
-
- /* Line number things. */
- logical_input_line = -1;
- 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 (flag_m68k_mri);
-}
-
-void
-input_scrub_end (void)
-{
- if (buffer_start)
- {
- free (buffer_start);
- buffer_start = 0;
- input_file_end ();
- }
-}
-
-/* Start reading input from a new file.
- Return start of caller's part of buffer. */
-
-char *
-input_scrub_new_file (char *filename)
-{
- input_file_open (filename, !flag_no_comments);
- 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 (char *filename, char *position)
-{
- next_saved_file = input_scrub_push (position);
- return input_scrub_new_file (filename);
-}
-
-/* Start getting input from an sb structure. This is used when
- expanding a macro. */
-
-void
-input_scrub_include_sb (sb *from, char *position, int is_expansion)
-{
- if (macro_nest > max_macro_nest)
- as_fatal (_("macros nested too deeply"));
- ++macro_nest;
-
-#ifdef md_macro_start
- if (is_expansion)
- {
- md_macro_start ();
- }
-#endif
-
- next_saved_file = input_scrub_push (position);
-
- sb_new (&from_sb);
- from_sb_is_expansion = is_expansion;
- if (from->len >= 1 && from->ptr[0] != '\n')
- {
- /* Add the sentinel required by read.c. */
- sb_add_char (&from_sb, '\n');
- }
- sb_scrub_and_add_sb (&from_sb, from);
- sb_index = 1;
-
- /* These variables are reset by input_scrub_push. Restore them
- since we are, after all, still at the same point in the file. */
- logical_input_line = next_saved_file->logical_input_line;
- logical_input_file = next_saved_file->logical_input_file;
-}
-
-void
-input_scrub_close (void)
-{
- input_file_close ();
-}
-
-char *
-input_scrub_next_buffer (char **bufp)
-{
- register char *limit; /*->just after last char of buffer. */
-
- if (sb_index >= 0)
- {
- if (sb_index >= from_sb.len)
- {
- sb_kill (&from_sb);
- if (from_sb_is_expansion
- )
- {
- cond_finish_check (macro_nest);
-#ifdef md_macro_end
- /* Allow the target to clean up per-macro expansion
- data. */
- md_macro_end ();
-#endif
- }
- --macro_nest;
- partial_where = NULL;
- if (next_saved_file != NULL)
- *bufp = input_scrub_pop (next_saved_file);
- return partial_where;
- }
-
- partial_where = from_sb.ptr + from_sb.len;
- partial_size = 0;
- *bufp = from_sb.ptr + sb_index;
- sb_index = from_sb.len;
- return partial_where;
- }
-
- *bufp = buffer_start + BEFORE_SIZE;
-
- if (partial_size)
- {
- memcpy (buffer_start + BEFORE_SIZE, partial_where,
- (unsigned int) partial_size);
- memcpy (buffer_start + BEFORE_SIZE, save_source, 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 - 1; *p != '\n'; --p)
- ;
- ++p;
-
- while (p <= buffer_start + BEFORE_SIZE)
- {
- int limoff;
-
- limoff = limit - buffer_start;
- buffer_length += input_file_buffer_size ();
- buffer_start = xrealloc (buffer_start,
- (BEFORE_SIZE
- + 2 * buffer_length
- + AFTER_SIZE));
- *bufp = buffer_start + BEFORE_SIZE;
- limit = input_file_give_next_buffer (buffer_start + limoff);
-
- if (limit == NULL)
- {
- as_warn (_("partial line at end of file ignored"));
- partial_where = NULL;
- if (next_saved_file)
- *bufp = input_scrub_pop (next_saved_file);
- return NULL;
- }
-
- for (p = limit - 1; *p != '\n'; --p)
- ;
- ++p;
- }
-
- 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"));
- }
-
- /* Tell the listing we've finished the file. */
- LISTING_EOF ();
-
- /* 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);
-}
-
-/* The remaining part of this file deals with line numbers, error
- messages and so on. Return TRUE if we opened any file. */
-
-int
-seen_at_least_1_file (void)
-{
- return (physical_input_file != NULL);
-}
-
-void
-bump_line_counters (void)
-{
- if (sb_index < 0)
- {
- ++physical_input_line;
- if (logical_input_line >= 0)
- ++logical_input_line;
- }
-}
-
-/* Tells us what the new logical line number and file are.
- If the line_number is -1, we don't change the current logical line
- number. If it is -2, we decrement the logical line number (this is
- to support the .appfile pseudo-op inserted into the stream by
- do_scrub_chars).
- If the fname is NULL, we don't change the current logical file name.
- Returns nonzero if the filename actually changes. */
-
-int
-new_logical_line (char *fname, /* DON'T destroy it! We point to it! */
- int line_number)
-{
- if (line_number >= 0)
- logical_input_line = line_number;
- else if (line_number == -2 && logical_input_line > 0)
- --logical_input_line;
-
- if (fname
- && (logical_input_file == NULL
- || strcmp (logical_input_file, fname)))
- {
- logical_input_file = fname;
- return 1;
- }
- else
- return 0;
-}
-
-/* Return the current file name and line number.
- namep should be char * const *, but there are compilers which screw
- up declarations like that, and it's easier to avoid it. */
-
-void
-as_where (char **namep, unsigned int *linep)
-{
- if (logical_input_file != NULL
- && (linep == NULL || logical_input_line >= 0))
- {
- *namep = logical_input_file;
- if (linep != NULL)
- *linep = logical_input_line;
- }
- else if (physical_input_file != NULL)
- {
- *namep = physical_input_file;
- if (linep != NULL)
- *linep = physical_input_line;
- }
- else
- {
- *namep = 0;
- if (linep != NULL)
- *linep = 0;
- }
-}