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fecd2382 | 1 | /* input_scrub.c - Break up input buffers into whole numbers of lines. |
3340f7e5 | 2 | Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc. |
a39116f1 RP |
3 | |
4 | This file is part of GAS, the GNU Assembler. | |
5 | ||
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) | |
9 | any later version. | |
10 | ||
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. | |
15 | ||
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. */ | |
fecd2382 RP |
19 | |
20 | #include <errno.h> /* Need this to make errno declaration right */ | |
21 | #include "as.h" | |
22 | #include "input-file.h" | |
23 | ||
24 | /* | |
25 | * O/S independent module to supply buffers of sanitised source code | |
26 | * to rest of assembler. We get sanitized input data of arbitrary length. | |
27 | * We break these buffers on line boundaries, recombine pieces that | |
28 | * were broken across buffers, and return a buffer of full lines to | |
29 | * the caller. | |
30 | * The last partial line begins the next buffer we build and return to caller. | |
31 | * The buffer returned to caller is preceeded by BEFORE_STRING and followed | |
32 | * by AFTER_STRING, as sentinels. The last character before AFTER_STRING | |
33 | * is a newline. | |
34 | * Also looks after line numbers, for e.g. error messages. | |
35 | */ | |
36 | ||
37 | /* | |
38 | * We don't care how filthy our buffers are, but our callers assume | |
39 | * that the following sanitation has already been done. | |
40 | * | |
41 | * No comments, reduce a comment to a space. | |
42 | * Reduce a tab to a space unless it is 1st char of line. | |
43 | * All multiple tabs and spaces collapsed into 1 char. Tab only | |
44 | * legal if 1st char of line. | |
45 | * # line file statements converted to .line x;.file y; statements. | |
46 | * Escaped newlines at end of line: remove them but add as many newlines | |
47 | * to end of statement as you removed in the middle, to synch line numbers. | |
48 | */ | |
49 | \f | |
50 | #define BEFORE_STRING ("\n") | |
51 | #define AFTER_STRING ("\0") /* bcopy of 0 chars might choke. */ | |
52 | #define BEFORE_SIZE (1) | |
53 | #define AFTER_SIZE (1) | |
54 | ||
55 | static char * buffer_start; /*->1st char of full buffer area. */ | |
56 | static char * partial_where; /*->after last full line in buffer. */ | |
57 | static int partial_size; /* >=0. Number of chars in partial line in buffer. */ | |
58 | static char save_source [AFTER_SIZE]; | |
a39116f1 RP |
59 | /* Because we need AFTER_STRING just after last */ |
60 | /* full line, it clobbers 1st part of partial */ | |
61 | /* line. So we preserve 1st part of partial */ | |
62 | /* line here. */ | |
fecd2382 | 63 | static int buffer_length; /* What is the largest size buffer that */ |
a39116f1 RP |
64 | /* input_file_give_next_buffer() could */ |
65 | /* return to us? */ | |
fecd2382 | 66 | |
a39116f1 RP |
67 | /* Saved information about the file that .include'd this one. When we hit EOF, |
68 | we automatically pop to that file. */ | |
fecd2382 RP |
69 | |
70 | static char *next_saved_file; | |
71 | ||
a39116f1 RP |
72 | /* We can have more than one source file open at once, though the info for all |
73 | but the latest one are saved off in a struct input_save. These files remain | |
74 | open, so we are limited by the number of open files allowed by the | |
75 | underlying OS. We may also sequentially read more than one source file in an | |
76 | assembly. */ | |
fecd2382 | 77 | |
a39116f1 RP |
78 | /* We must track the physical file and line number for error messages. We also |
79 | track a "logical" file and line number corresponding to (C?) compiler | |
80 | source line numbers. Whenever we open a file we must fill in | |
81 | physical_input_file. So if it is NULL we have not opened any files yet. */ | |
fecd2382 | 82 | |
a39116f1 RP |
83 | char *physical_input_file; |
84 | char *logical_input_file; | |
fecd2382 | 85 | |
a39116f1 RP |
86 | typedef unsigned int line_numberT; /* 1-origin line number in a source file. */ |
87 | /* A line ends in '\n' or eof. */ | |
fecd2382 | 88 | |
a39116f1 RP |
89 | line_numberT physical_input_line; |
90 | line_numberT logical_input_line; | |
fecd2382 RP |
91 | |
92 | /* Struct used to save the state of the input handler during include files */ | |
93 | struct input_save { | |
94 | char *buffer_start; | |
95 | char *partial_where; | |
96 | int partial_size; | |
97 | char save_source [AFTER_SIZE]; | |
98 | int buffer_length; | |
99 | char *physical_input_file; | |
100 | char *logical_input_file; | |
101 | line_numberT physical_input_line; | |
102 | line_numberT logical_input_line; | |
103 | char *next_saved_file; /* Chain of input_saves */ | |
104 | char *input_file_save; /* Saved state of input routines */ | |
105 | char *saved_position; /* Caller's saved position in buf */ | |
106 | }; | |
107 | ||
3340f7e5 | 108 | #if __STDC__ == 1 |
fecd2382 RP |
109 | static void as_1_char(unsigned int c, FILE *stream); |
110 | #else /* __STDC__ */ | |
111 | static void as_1_char(); | |
3340f7e5 | 112 | #endif /* not __STDC__ */ |
fecd2382 RP |
113 | |
114 | /* Push the state of input reading and scrubbing so that we can #include. | |
115 | The return value is a 'void *' (fudged for old compilers) to a save | |
116 | area, which can be restored by passing it to input_scrub_pop(). */ | |
a39116f1 RP |
117 | char *input_scrub_push(saved_position) |
118 | char *saved_position; | |
fecd2382 RP |
119 | { |
120 | register struct input_save *saved; | |
a39116f1 | 121 | |
fecd2382 | 122 | saved = (struct input_save *) xmalloc(sizeof *saved); |
a39116f1 | 123 | |
fecd2382 RP |
124 | saved->saved_position = saved_position; |
125 | saved->buffer_start = buffer_start; | |
126 | saved->partial_where = partial_where; | |
127 | saved->partial_size = partial_size; | |
128 | saved->buffer_length = buffer_length; | |
129 | saved->physical_input_file = physical_input_file; | |
130 | saved->logical_input_file = logical_input_file; | |
131 | saved->physical_input_line = physical_input_line; | |
132 | saved->logical_input_line = logical_input_line; | |
a39116f1 | 133 | bcopy(saved->save_source, save_source, sizeof(save_source)); |
fecd2382 | 134 | saved->next_saved_file = next_saved_file; |
a39116f1 RP |
135 | saved->input_file_save = input_file_push(); |
136 | ||
137 | input_scrub_begin(); /* Reinitialize! */ | |
138 | ||
139 | return((char *) saved); | |
140 | } /* input_scrub_push() */ | |
fecd2382 RP |
141 | |
142 | char * | |
a39116f1 RP |
143 | input_scrub_pop (arg) |
144 | char *arg; | |
fecd2382 RP |
145 | { |
146 | register struct input_save *saved; | |
147 | char *saved_position; | |
a39116f1 | 148 | |
fecd2382 | 149 | input_scrub_end (); /* Finish off old buffer */ |
a39116f1 | 150 | |
fecd2382 | 151 | saved = (struct input_save *)arg; |
a39116f1 | 152 | |
fecd2382 RP |
153 | input_file_pop (saved->input_file_save); |
154 | saved_position = saved->saved_position; | |
155 | buffer_start = saved->buffer_start; | |
156 | buffer_length = saved->buffer_length; | |
157 | physical_input_file = saved->physical_input_file; | |
158 | logical_input_file = saved->logical_input_file; | |
159 | physical_input_line = saved->physical_input_line; | |
160 | logical_input_line = saved->logical_input_line; | |
161 | partial_where = saved->partial_where; | |
162 | partial_size = saved->partial_size; | |
163 | next_saved_file = saved->next_saved_file; | |
164 | bcopy (save_source, saved->save_source, sizeof (save_source)); | |
a39116f1 | 165 | |
fecd2382 RP |
166 | free(arg); |
167 | return saved_position; | |
168 | } | |
169 | ||
170 | \f | |
171 | void | |
a39116f1 | 172 | input_scrub_begin () |
fecd2382 | 173 | { |
a39116f1 RP |
174 | know(strlen(BEFORE_STRING) == BEFORE_SIZE); |
175 | know(strlen(AFTER_STRING) == AFTER_SIZE || (AFTER_STRING[0] == '\0' && AFTER_SIZE == 1)); | |
176 | ||
177 | input_file_begin (); | |
178 | ||
179 | buffer_length = input_file_buffer_size (); | |
180 | ||
181 | buffer_start = xmalloc((long)(BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE)); | |
182 | bcopy (BEFORE_STRING, buffer_start, (int)BEFORE_SIZE); | |
183 | ||
184 | /* Line number things. */ | |
185 | logical_input_line = 0; | |
186 | logical_input_file = (char *)NULL; | |
187 | physical_input_file = NULL; /* No file read yet. */ | |
188 | next_saved_file = NULL; /* At EOF, don't pop to any other file */ | |
189 | do_scrub_begin(); | |
fecd2382 RP |
190 | } |
191 | ||
192 | void | |
a39116f1 | 193 | input_scrub_end () |
fecd2382 | 194 | { |
a39116f1 RP |
195 | if (buffer_start) |
196 | { | |
197 | free (buffer_start); | |
198 | buffer_start = 0; | |
199 | input_file_end (); | |
200 | } | |
fecd2382 RP |
201 | } |
202 | ||
203 | /* Start reading input from a new file. */ | |
204 | ||
205 | char * /* Return start of caller's part of buffer. */ | |
a39116f1 RP |
206 | input_scrub_new_file (filename) |
207 | char * filename; | |
fecd2382 | 208 | { |
a39116f1 RP |
209 | input_file_open (filename, !flagseen['f']); |
210 | physical_input_file = filename[0] ? filename : "{standard input}"; | |
211 | physical_input_line = 0; | |
212 | ||
213 | partial_size = 0; | |
214 | return (buffer_start + BEFORE_SIZE); | |
fecd2382 RP |
215 | } |
216 | ||
217 | ||
218 | /* Include a file from the current file. Save our state, cause it to | |
219 | be restored on EOF, and begin handling a new file. Same result as | |
220 | input_scrub_new_file. */ | |
221 | ||
222 | char * | |
a39116f1 RP |
223 | input_scrub_include_file (filename, position) |
224 | char *filename; | |
225 | char *position; | |
fecd2382 | 226 | { |
a39116f1 RP |
227 | next_saved_file = input_scrub_push(position); |
228 | return input_scrub_new_file (filename); | |
fecd2382 RP |
229 | } |
230 | ||
231 | void | |
a39116f1 | 232 | input_scrub_close () |
fecd2382 | 233 | { |
a39116f1 | 234 | input_file_close (); |
fecd2382 RP |
235 | } |
236 | char * | |
a39116f1 | 237 | input_scrub_next_buffer (bufp) |
fecd2382 RP |
238 | char **bufp; |
239 | { | |
a39116f1 RP |
240 | register char * limit; /*->just after last char of buffer. */ |
241 | ||
242 | *bufp = buffer_start + BEFORE_SIZE; | |
243 | ||
fecd2382 | 244 | #ifdef DONTDEF |
a39116f1 RP |
245 | if(preprocess) { |
246 | if(save_buffer) { | |
247 | *bufp = save_buffer; | |
248 | save_buffer = 0; | |
249 | } | |
250 | limit = input_file_give_next_buffer(buffer_start+BEFORE_SIZE); | |
251 | if (!limit) { | |
252 | partial_where = 0; | |
253 | if(partial_size) | |
254 | as_warn("Partial line at end of file ignored"); | |
255 | return partial_where; | |
256 | } | |
257 | ||
258 | if(partial_size) | |
259 | bcopy(save_source, partial_where,(int)AFTER_SIZE); | |
260 | do_scrub(partial_where,partial_size,buffer_start+BEFORE_SIZE,limit-(buffer_start+BEFORE_SIZE),&out_string,&out_length); | |
261 | limit=out_string + out_length; | |
262 | for(p=limit;*--p!='\n';) | |
263 | ; | |
264 | p++; | |
265 | if(p<=buffer_start+BEFORE_SIZE) | |
266 | as_fatal("Source line too long. Please change file '%s' and re-make the assembler.", __FILE__); | |
267 | ||
268 | partial_where = p; | |
269 | partial_size = limit-p; | |
270 | bcopy(partial_where, save_source,(int)AFTER_SIZE); | |
271 | bcopy(AFTER_STRING, partial_where, (int)AFTER_SIZE); | |
272 | ||
273 | save_buffer = *bufp; | |
274 | *bufp = out_string; | |
275 | ||
276 | return partial_where; | |
fecd2382 | 277 | } |
a39116f1 RP |
278 | |
279 | /* We're not preprocessing. Do the right thing */ | |
280 | #endif | |
281 | if (partial_size) | |
282 | { | |
283 | bcopy (partial_where, buffer_start + BEFORE_SIZE, (int)partial_size); | |
284 | bcopy (save_source, buffer_start + BEFORE_SIZE, (int)AFTER_SIZE); | |
285 | } | |
286 | limit = input_file_give_next_buffer (buffer_start + BEFORE_SIZE + partial_size); | |
287 | if (limit) | |
288 | { | |
289 | register char * p; /* Find last newline. */ | |
290 | ||
291 | for (p = limit; * -- p != '\n';) | |
292 | { | |
293 | } | |
294 | ++ p; | |
295 | if (p <= buffer_start + BEFORE_SIZE) | |
296 | { | |
297 | as_fatal("Source line too long. Please change file %s then rebuild assembler.", __FILE__); | |
298 | } | |
299 | partial_where = p; | |
300 | partial_size = limit - p; | |
301 | bcopy (partial_where, save_source, (int)AFTER_SIZE); | |
302 | bcopy (AFTER_STRING, partial_where, (int)AFTER_SIZE); | |
303 | } | |
304 | else | |
305 | { | |
306 | partial_where = 0; | |
307 | if (partial_size > 0) | |
308 | { | |
309 | as_warn("Partial line at end of file ignored"); | |
310 | } | |
311 | /* If we should pop to another file at EOF, do it. */ | |
312 | if (next_saved_file) | |
313 | { | |
314 | *bufp = input_scrub_pop (next_saved_file); /* Pop state */ | |
315 | /* partial_where is now correct to return, since we popped it. */ | |
316 | } | |
317 | } | |
318 | return (partial_where); | |
fecd2382 RP |
319 | } |
320 | \f | |
321 | /* | |
322 | * The remaining part of this file deals with line numbers, error | |
323 | * messages and so on. | |
324 | */ | |
325 | ||
326 | ||
327 | int | |
a39116f1 | 328 | seen_at_least_1_file () /* TRUE if we opened any file. */ |
fecd2382 | 329 | { |
a39116f1 | 330 | return (physical_input_file != NULL); |
fecd2382 RP |
331 | } |
332 | ||
333 | void | |
a39116f1 | 334 | bump_line_counters () |
fecd2382 | 335 | { |
a39116f1 RP |
336 | ++ physical_input_line; |
337 | /* ++ logical_input_line; FIXME-now remove this. */ | |
fecd2382 RP |
338 | } |
339 | \f | |
340 | /* | |
341 | * new_logical_line() | |
342 | * | |
343 | * Tells us what the new logical line number and file are. | |
344 | * If the line_number is <0, we don't change the current logical line number. | |
345 | * If the fname is NULL, we don't change the current logical file name. | |
346 | */ | |
347 | void new_logical_line(fname, line_number) | |
a39116f1 RP |
348 | char *fname; /* DON'T destroy it! We point to it! */ |
349 | int line_number; | |
fecd2382 RP |
350 | { |
351 | if (fname) { | |
352 | logical_input_file = fname; | |
353 | } /* if we have a file name */ | |
354 | ||
355 | if (line_number >= 0) { | |
356 | logical_input_line = line_number; | |
357 | } /* if we have a line number */ | |
358 | } /* new_logical_line() */ | |
359 | \f | |
360 | /* | |
361 | * a s _ w h e r e () | |
362 | * | |
363 | * Write a line to stderr locating where we are in reading | |
364 | * input source files. | |
365 | * As a sop to the debugger of AS, pretty-print the offending line. | |
366 | */ | |
a39116f1 RP |
367 | void as_where() { |
368 | char *p; | |
369 | line_numberT line; | |
370 | ||
371 | if (logical_input_file && (logical_input_line > 0)) { | |
372 | p = logical_input_file; | |
373 | line = logical_input_line; | |
374 | } else { | |
375 | p = physical_input_file; | |
376 | line = physical_input_line; | |
377 | } /* line number should match file name */ | |
378 | ||
379 | fprintf(stderr, "%s:%u: ", p, line); | |
380 | ||
fecd2382 | 381 | #ifdef DONTDEF |
a39116f1 RP |
382 | if (physical_input_file) { |
383 | if (input_file_is_open()) { /* we can still read lines from source */ | |
384 | fprintf (stderr," @ physical line %ld., file \"%s\"", | |
385 | (long) physical_input_line, physical_input_file); | |
386 | fprintf (stderr," @ logical line %ld., file \"%s\"\n", | |
387 | (long) logical_input_line, logical_input_file); | |
388 | (void)putc(' ', stderr); | |
389 | as_howmuch (stderr); | |
390 | (void)putc('\n', stderr); | |
391 | } else { | |
392 | fprintf(stderr, " After reading source.\n"); | |
393 | } /* input file is still open */ | |
394 | } else { | |
395 | fprintf(stderr, " Before reading source.\n"); | |
396 | } /* we tried to read SOME source */ | |
397 | #endif /* DONTDEF */ | |
398 | ||
399 | return; | |
400 | } /* as_where() */ | |
fecd2382 RP |
401 | |
402 | ||
403 | ||
404 | \f | |
405 | /* | |
406 | * a s _ h o w m u c h () | |
407 | * | |
408 | * Output to given stream how much of line we have scanned so far. | |
409 | * Assumes we have scanned up to and including input_line_pointer. | |
410 | * No free '\n' at end of line. | |
411 | */ | |
412 | void | |
a39116f1 RP |
413 | as_howmuch (stream) |
414 | FILE * stream; /* Opened for write please. */ | |
fecd2382 | 415 | { |
a39116f1 RP |
416 | register char * p; /* Scan input line. */ |
417 | /* register char c; JF unused */ | |
418 | ||
419 | for (p = input_line_pointer - 1; * p != '\n'; --p) | |
420 | { | |
421 | } | |
422 | ++ p; /* p->1st char of line. */ | |
423 | for (; p <= input_line_pointer; p++) | |
424 | { | |
425 | /* Assume ASCII. EBCDIC & other micro-computer char sets ignored. */ | |
426 | /* c = *p & 0xFF; JF unused */ | |
427 | as_1_char(*p, stream); | |
428 | } | |
fecd2382 RP |
429 | } |
430 | ||
431 | static void as_1_char (c,stream) | |
432 | unsigned int c; | |
433 | FILE *stream; | |
434 | { | |
a39116f1 RP |
435 | if (c > 127) |
436 | { | |
437 | (void)putc('%', stream); | |
438 | c -= 128; | |
439 | } | |
440 | if (c < 32) | |
441 | { | |
442 | (void)putc('^', stream); | |
443 | c += '@'; | |
444 | } | |
445 | (void)putc(c, stream); | |
fecd2382 RP |
446 | } |
447 | ||
448 | /* | |
449 | * Local Variables: | |
450 | * comment-column: 0 | |
451 | * fill-column: 131 | |
452 | * End: | |
453 | */ | |
454 | ||
8b228fe9 | 455 | /* end of input_scrub.c */ |