1 /* input_scrub.c - Break up input buffers into whole numbers of lines.
2 Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 static char rcsid[] = "$FreeBSD$";
24 #include <errno.h> /* Need this to make errno declaration right */
26 #include "input-file.h"
29 * O/S independent module to supply buffers of sanitised source code
30 * to rest of assembler. We get sanitized input data of arbitrary length.
31 * We break these buffers on line boundaries, recombine pieces that
32 * were broken across buffers, and return a buffer of full lines to
34 * The last partial line begins the next buffer we build and return to caller.
35 * The buffer returned to caller is preceeded by BEFORE_STRING and followed
36 * by AFTER_STRING, as sentinels. The last character before AFTER_STRING
38 * Also looks after line numbers, for e.g. error messages.
42 * We don't care how filthy our buffers are, but our callers assume
43 * that the following sanitation has already been done.
45 * No comments, reduce a comment to a space.
46 * Reduce a tab to a space unless it is 1st char of line.
47 * All multiple tabs and spaces collapsed into 1 char. Tab only
48 * legal if 1st char of line.
49 * # line file statements converted to .line x;.file y; statements.
50 * Escaped newlines at end of line: remove them but add as many newlines
51 * to end of statement as you removed in the middle, to synch line numbers.
54 #define BEFORE_STRING ("\n")
55 #define AFTER_STRING ("\0") /* memcpy of 0 chars might choke. */
56 #define BEFORE_SIZE (1)
57 #define AFTER_SIZE (1)
59 static char *buffer_start; /*->1st char of full buffer area. */
60 static char *partial_where; /*->after last full line in buffer. */
61 static int partial_size; /* >=0. Number of chars in partial line in buffer. */
62 static char save_source[AFTER_SIZE];
63 /* Because we need AFTER_STRING just after last */
64 /* full line, it clobbers 1st part of partial */
65 /* line. So we preserve 1st part of partial */
67 static unsigned int buffer_length; /* What is the largest size buffer that */
68 /* input_file_give_next_buffer() could */
71 /* Saved information about the file that .include'd this one. When we hit EOF,
72 we automatically pop to that file. */
74 static char *next_saved_file;
76 /* We can have more than one source file open at once, though the info for all
77 but the latest one are saved off in a struct input_save. These files remain
78 open, so we are limited by the number of open files allowed by the
79 underlying OS. We may also sequentially read more than one source file in an
82 /* We must track the physical file and line number for error messages. We also
83 track a "logical" file and line number corresponding to (C?) compiler
84 source line numbers. Whenever we open a file we must fill in
85 physical_input_file. So if it is NULL we have not opened any files yet. */
87 static char *physical_input_file;
88 static char *logical_input_file;
90 typedef unsigned int line_numberT; /* 1-origin line number in a source file. */
91 /* A line ends in '\n' or eof. */
93 static line_numberT physical_input_line;
94 static int logical_input_line;
96 /* Struct used to save the state of the input handler during include files */
102 char save_source[AFTER_SIZE];
103 unsigned int buffer_length;
104 char *physical_input_file;
105 char *logical_input_file;
106 line_numberT physical_input_line;
107 int logical_input_line;
108 char *next_saved_file; /* Chain of input_saves */
109 char *input_file_save; /* Saved state of input routines */
110 char *saved_position; /* Caller's saved position in buf */
113 static char *input_scrub_push PARAMS ((char *saved_position));
114 static char *input_scrub_pop PARAMS ((char *arg));
115 static void as_1_char PARAMS ((unsigned int c, FILE * stream));
117 /* Push the state of input reading and scrubbing so that we can #include.
118 The return value is a 'void *' (fudged for old compilers) to a save
119 area, which can be restored by passing it to input_scrub_pop(). */
121 input_scrub_push (saved_position)
122 char *saved_position;
124 register struct input_save *saved;
126 saved = (struct input_save *) xmalloc (sizeof *saved);
128 saved->saved_position = saved_position;
129 saved->buffer_start = buffer_start;
130 saved->partial_where = partial_where;
131 saved->partial_size = partial_size;
132 saved->buffer_length = buffer_length;
133 saved->physical_input_file = physical_input_file;
134 saved->logical_input_file = logical_input_file;
135 saved->physical_input_line = physical_input_line;
136 saved->logical_input_line = logical_input_line;
137 memcpy (saved->save_source, save_source, sizeof (save_source));
138 saved->next_saved_file = next_saved_file;
139 saved->input_file_save = input_file_push ();
141 input_file_begin (); /* Reinitialize! */
142 logical_input_line = -1;
143 logical_input_file = (char *) NULL;
144 buffer_length = input_file_buffer_size ();
146 buffer_start = xmalloc ((BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE));
147 memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE);
149 return ((char *) saved);
150 } /* input_scrub_push() */
153 input_scrub_pop (arg)
156 register struct input_save *saved;
157 char *saved_position;
159 input_scrub_end (); /* Finish off old buffer */
161 saved = (struct input_save *) arg;
163 input_file_pop (saved->input_file_save);
164 saved_position = saved->saved_position;
165 buffer_start = saved->buffer_start;
166 buffer_length = saved->buffer_length;
167 physical_input_file = saved->physical_input_file;
168 logical_input_file = saved->logical_input_file;
169 physical_input_line = saved->physical_input_line;
170 logical_input_line = saved->logical_input_line;
171 partial_where = saved->partial_where;
172 partial_size = saved->partial_size;
173 next_saved_file = saved->next_saved_file;
174 memcpy (save_source, saved->save_source, sizeof (save_source));
177 return saved_position;
184 know (strlen (BEFORE_STRING) == BEFORE_SIZE);
185 know (strlen (AFTER_STRING) == AFTER_SIZE || (AFTER_STRING[0] == '\0' && AFTER_SIZE == 1));
189 buffer_length = input_file_buffer_size ();
191 buffer_start = xmalloc ((BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE));
192 memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE);
194 /* Line number things. */
195 logical_input_line = -1;
196 logical_input_file = (char *) NULL;
197 physical_input_file = NULL; /* No file read yet. */
198 next_saved_file = NULL; /* At EOF, don't pop to any other file */
213 /* Start reading input from a new file. */
215 char * /* Return start of caller's part of buffer. */
216 input_scrub_new_file (filename)
219 input_file_open (filename, !flagseen['f']);
220 physical_input_file = filename[0] ? filename : "{standard input}";
221 physical_input_line = 0;
224 return (buffer_start + BEFORE_SIZE);
228 /* Include a file from the current file. Save our state, cause it to
229 be restored on EOF, and begin handling a new file. Same result as
230 input_scrub_new_file. */
233 input_scrub_include_file (filename, position)
237 next_saved_file = input_scrub_push (position);
238 return input_scrub_new_file (filename);
248 input_scrub_next_buffer (bufp)
251 register char *limit; /*->just after last char of buffer. */
253 *bufp = buffer_start + BEFORE_SIZE;
257 memcpy (buffer_start + BEFORE_SIZE, partial_where,
258 (unsigned int) partial_size);
259 memcpy (buffer_start + BEFORE_SIZE, save_source, AFTER_SIZE);
261 limit = input_file_give_next_buffer (buffer_start + BEFORE_SIZE + partial_size);
264 register char *p; /* Find last newline. */
266 for (p = limit; *--p != '\n';);;
268 if (p <= buffer_start + BEFORE_SIZE)
270 as_fatal ("Source line too long. Please change file %s then rebuild assembler.", __FILE__);
273 partial_size = limit - p;
274 memcpy (save_source, partial_where, (int) AFTER_SIZE);
275 memcpy (partial_where, AFTER_STRING, (int) AFTER_SIZE);
280 if (partial_size > 0)
282 as_warn ("Partial line at end of file ignored");
284 /* If we should pop to another file at EOF, do it. */
287 *bufp = input_scrub_pop (next_saved_file); /* Pop state */
288 /* partial_where is now correct to return, since we popped it. */
291 return (partial_where);
292 } /* input_scrub_next_buffer() */
295 * The remaining part of this file deals with line numbers, error
296 * messages and so on.
301 seen_at_least_1_file () /* TRUE if we opened any file. */
303 return (physical_input_file != NULL);
307 bump_line_counters ()
309 ++physical_input_line;
310 if (logical_input_line >= 0)
311 ++logical_input_line;
317 * Tells us what the new logical line number and file are.
318 * If the line_number is -1, we don't change the current logical line
319 * number. If it is -2, we decrement the logical line number (this is
320 * to support the .appfile pseudo-op inserted into the stream by
321 * do_scrub_next_char).
322 * If the fname is NULL, we don't change the current logical file name.
325 new_logical_line (fname, line_number)
326 char *fname; /* DON'T destroy it! We point to it! */
331 logical_input_file = fname;
332 } /* if we have a file name */
334 if (line_number >= 0)
335 logical_input_line = line_number;
336 else if (line_number == -2 && logical_input_line > 0)
337 --logical_input_line;
338 } /* new_logical_line() */
343 * Return the current file name and line number.
344 * namep should be char * const *, but there are compilers which screw
345 * up declarations like that, and it's easier to avoid it.
348 as_where (namep, linep)
352 if (logical_input_file != NULL
353 && (linep == NULL || logical_input_line >= 0))
355 *namep = logical_input_file;
357 *linep = logical_input_line;
359 else if (physical_input_file != NULL)
361 *namep = physical_input_file;
363 *linep = physical_input_line;
367 *namep = (char *) "*unknown*";
377 * a s _ h o w m u c h ()
379 * Output to given stream how much of line we have scanned so far.
380 * Assumes we have scanned up to and including input_line_pointer.
381 * No free '\n' at end of line.
385 FILE *stream; /* Opened for write please. */
387 register char *p; /* Scan input line. */
388 /* register char c; JF unused */
390 for (p = input_line_pointer - 1; *p != '\n'; --p)
393 ++p; /* p->1st char of line. */
394 for (; p <= input_line_pointer; p++)
396 /* Assume ASCII. EBCDIC & other micro-computer char sets ignored. */
397 /* c = *p & 0xFF; JF unused */
398 as_1_char ((unsigned char) *p, stream);
403 as_1_char (c, stream)
409 (void) putc ('%', stream);
414 (void) putc ('^', stream);
417 (void) putc (c, stream);
420 /* end of input_scrub.c */