6e182d98 |
1 | /* |
6e182d98 |
2 | * TODO possibly after that: |
3 | * |
4 | * - Need to handle >2Gb files! Up the `filesize' type to long |
d28a4799 |
5 | * long, and use it everywhere (not just in buffer.c). |
6e182d98 |
6 | * |
7 | * - Multiple buffers, multiple on-screen windows. |
8 | * + ^X^F to open new file |
9 | * + ^X^R to open new file RO |
10 | * + ^X b to switch buffers in a window |
11 | * + ^X o to switch windows |
12 | * + ^X 2 to split a window |
13 | * + ^X 1 to destroy all windows but this |
14 | * + ^X 0 to destroy this window |
15 | * + ^X ^ to enlarge this window by one line |
16 | * + width settings vary per buffer (aha, _that's_ why I wanted |
17 | * a buffer structure surrounding the raw B-tree) |
18 | * + hex-editor-style minibuffer for entering search terms, |
19 | * rather than the current rather crap one; in particular |
20 | * this enables pasting into the search string. |
21 | * + er, how exactly do we deal with the problem of saving over |
d28a4799 |
22 | * a file which we're maintaining references to in another |
23 | * buffer? The _current_ buffer can at least be sorted out by |
24 | * replacing it with a fresh tree containing a single |
25 | * file-data block, but other buffers are in trouble. |
26 | * * if we can rely on Unix fd semantics, this isn't too |
27 | * bad; we can just keep the fd open on the original file, |
28 | * and then the data stays around even after we rename(2) |
29 | * our new version over the top. Disk space usage gets |
30 | * silly after a few iterations, but it's better than |
31 | * nothing. |
6e182d98 |
32 | * |
33 | * - Undo! |
34 | * + this actually doesn't seem _too_ horrid. For a start, one |
35 | * simple approach would be to clone the entire buffer B-tree |
36 | * every time we perform an operation! That's actually not |
37 | * _too_ expensive, if we maintain a limit on the number of |
38 | * operations we may undo. |
39 | * + I had also thought of cloning the tree we insert for each |
40 | * buf_insert_data and cloning the one removed for each |
41 | * buf_delete_data (both must be cloned for an overwrite), |
42 | * but I'm not convinced that simply cloning the entire thing |
43 | * isn't a superior option. |
d28a4799 |
44 | * + this really starts to show up the distinction between a |
45 | * `buffer' and a bare tree. A buffer is something which has |
46 | * an undo chain attached; so, in particular, the cut buffer |
47 | * shouldn't be one. Sort that out. |
6e182d98 |
48 | * |
49 | * - Reverse search. |
50 | * + need to construct a reverse DFA. |
51 | * + probably should construct both every time, so that you can |
52 | * search forward for a thing and then immediately change |
53 | * your mind and search backward for the same thing. |
54 | * |
55 | * - In-place editing. |
56 | * + this is an extra option when running in Fix mode. It |
57 | * causes a change of semantics when saving: instead of |
58 | * constructing a new backup file and writing it over the old |
59 | * one, we simply seek within the original file and write out |
60 | * all the pieces that have changed. |
61 | * + Primarily useful for editing disk devices directly |
d28a4799 |
62 | * (yikes!), or other situations where you actually cannot |
63 | * create a fresh copy of the file and rename(2) it into |
64 | * place. |
6e182d98 |
65 | * + I had intended to suggest that in Fix mode this would be |
66 | * nice and easy, since every element of the buffer tree is |
67 | * either a literal block (needs writing) or a from-file |
68 | * block denoting the same file _in the same position_. |
69 | * However, this is not in fact the case because you can cut |
70 | * and paste, so it's not that easy. |
71 | * + So I'm forced to the conclusion that when operating in |
72 | * this mode, it becomes illegal to cut and paste from-file |
73 | * blocks: they must be loaded in full at some point. |
74 | * * Thinking ahead about multiple-buffer operation: it |
75 | * would be a bad idea to keep a from-file block |
76 | * referencing /dev/hda and paste it into another ordinary |
77 | * buffer. But _also_ it would be a bad idea to paste a |
78 | * from-file block referencing a file stored _on_ /dev/hda |
79 | * into the in-place buffer dealing with /dev/hda itself. |
80 | * * So I'm forced to another odd conclusion, which is that |
81 | * from-file blocks must be eliminated in _two_ places: |
82 | * when copying a cut buffer _from_ an in-place buffer, |
83 | * _and_ when pasting a cut buffer _into_ one. |
84 | */ |
85 | |
86 | #include <stdio.h> |
87 | #include <stdlib.h> |
88 | #include <string.h> |
89 | #include <ctype.h> |
90 | #include <assert.h> |
91 | |
92 | #if defined(unix) && !defined(GO32) |
93 | #include <signal.h> |
94 | #include <sys/ioctl.h> |
95 | #include <termios.h> |
96 | #elif defined(MSDOS) |
97 | #include <dos.h> |
98 | #include <process.h> |
99 | #endif |
100 | |
101 | #include "tweak.h" |
102 | |
103 | static void init(void); |
104 | static void done(void); |
105 | static void load_file (char *); |
106 | |
107 | char toprint[256]; /* LUT: printable versions of chars */ |
108 | char hex[256][3]; /* LUT: binary to hex, 1 byte */ |
109 | |
110 | char message[80]; |
111 | |
112 | char decstatus[] = "%s TWEAK "VER": %-18.18s %s posn=%-10d size=%-10d"; |
113 | char hexstatus[] = "%s TWEAK "VER": %-18.18s %s posn=0x%-8X size=0x%-8X"; |
114 | char *statfmt = hexstatus; |
115 | |
116 | char last_char; |
117 | char *pname; |
118 | char *filename = NULL; |
119 | buffer *filedata, *cutbuffer = NULL; |
120 | int fix_mode = FALSE; |
121 | int look_mode = FALSE; |
122 | int eager_mode = FALSE; |
123 | int insert_mode = FALSE; |
124 | int edit_type = 1; /* 1,2 are hex digits, 0=ascii */ |
125 | int finished = FALSE; |
126 | int marking = FALSE; |
127 | int modified = FALSE; |
128 | int new_file = FALSE; /* shouldn't need initialisation - |
129 | * but let's not take chances :-) */ |
130 | int width = 16; |
131 | int realoffset = 0, offset = 16; |
132 | |
133 | int ascii_enabled = TRUE; |
134 | |
135 | long file_size = 0, top_pos = 0, cur_pos = 0, mark_point = 0; |
136 | |
137 | int scrlines; |
138 | |
139 | /* |
140 | * Main program |
141 | */ |
142 | int main(int argc, char **argv) { |
143 | int newoffset = -1, newwidth = -1; |
144 | |
145 | /* |
146 | * Parse command line arguments |
147 | */ |
148 | pname = *argv; /* program name */ |
149 | if (argc < 2) { |
150 | fprintf(stderr, |
151 | "usage: %s [-f] [-l] [-e] filename\n" |
152 | " or %s -D to write default tweak.rc to stdout\n", |
153 | pname, pname); |
154 | return 0; |
155 | } |
156 | |
157 | while (--argc > 0) { |
158 | char c, *p = *++argv, *value; |
159 | |
160 | if (*p == '-') { |
161 | p++; |
162 | while (*p) switch (c = *p++) { |
163 | case 'o': case 'O': |
164 | case 'w': case 'W': |
165 | /* |
166 | * these parameters require arguments |
167 | */ |
168 | if (*p) |
169 | value = p, p = ""; |
170 | else if (--argc) |
171 | value = *++argv; |
172 | else { |
173 | fprintf(stderr, "%s: option `-%c' requires an argument\n", |
174 | pname, c); |
175 | return 1; |
176 | } |
177 | switch (c) { |
178 | case 'o': case 'O': |
179 | newoffset = strtol(value, NULL, 0); /* allow `0xXX' */ |
180 | break; |
181 | case 'w': case 'W': |
182 | newwidth = strtol(value, NULL, 0); |
183 | break; |
184 | } |
185 | break; |
186 | case 'f': case 'F': |
187 | fix_mode = TRUE; |
188 | break; |
189 | case 'l': case 'L': |
190 | look_mode = TRUE; |
191 | break; |
192 | case 'e': case 'E': |
193 | eager_mode = TRUE; |
194 | break; |
195 | case 'D': |
196 | write_default_rc(); |
197 | return 0; |
198 | break; |
199 | } |
200 | } else { |
201 | if (filename) { |
202 | fprintf(stderr, "%s: multiple filenames specified\n", pname); |
203 | return 1; |
204 | } |
205 | filename = p; |
206 | } |
207 | } |
208 | |
209 | if (!filename) { |
210 | fprintf(stderr, "%s: no filename specified\n", pname); |
211 | return 1; |
212 | } |
213 | |
214 | read_rc(); |
215 | if (newoffset != -1) |
216 | realoffset = newoffset; |
217 | if (newwidth != -1) |
218 | width = newwidth; |
219 | load_file (filename); |
220 | init(); |
221 | fix_offset(); |
222 | do { |
223 | draw_scr (); |
224 | proc_key (); |
225 | } while (!finished); |
226 | done(); |
227 | |
228 | return 0; |
229 | } |
230 | |
231 | /* |
232 | * Fix up `offset' to match `realoffset'. Also, while we're here, |
233 | * enable or disable ASCII mode and sanity-check the width. |
234 | */ |
235 | void fix_offset(void) { |
236 | if (3*width+11 > display_cols) { |
237 | width = (display_cols-11) / 3; |
238 | sprintf (message, "Width reduced to %d to fit on the screen", width); |
239 | } |
240 | if (4*width+14 > display_cols) { |
241 | ascii_enabled = FALSE; |
242 | if (edit_type == 0) |
243 | edit_type = 1; /* force to hex mode */ |
244 | } else |
245 | ascii_enabled = TRUE; |
246 | offset = realoffset % width; |
247 | if (!offset) |
248 | offset = width; |
249 | } |
250 | |
251 | /* |
252 | * Initialise stuff at the beginning of the program: mostly the |
253 | * display. |
254 | */ |
255 | static void init(void) { |
256 | int i; |
257 | |
258 | display_setup(); |
259 | |
260 | display_define_colour(COL_BUFFER, 7, 0); |
261 | display_define_colour(COL_SELECT, 0, 7); |
262 | display_define_colour(COL_STATUS, 11, 4); |
263 | display_define_colour(COL_ESCAPE, 9, 0); |
264 | display_define_colour(COL_INVALID, 11, 0); |
265 | |
266 | for (i=0; i<256; i++) { |
267 | sprintf(hex[i], "%02X", i); |
268 | toprint[i] = (i>=32 && i<127 ? i : '.'); |
269 | } |
270 | } |
271 | |
272 | /* |
273 | * Clean up all the stuff that init() did. |
274 | */ |
275 | static void done(void) { |
276 | display_cleanup(); |
277 | } |
278 | |
279 | /* |
280 | * Load the file specified on the command line. |
281 | */ |
282 | static void load_file (char *fname) { |
283 | FILE *fp; |
284 | |
285 | file_size = 0; |
286 | if ( (fp = fopen (fname, "rb")) ) { |
287 | if (eager_mode) { |
288 | long len; |
289 | static char buffer[4096]; |
290 | |
291 | filedata = buf_new_empty(); |
292 | |
293 | file_size = 0; |
294 | |
295 | /* |
296 | * We've opened the file. Load it. |
297 | */ |
298 | while ( (len = fread (buffer, 1, sizeof(buffer), fp)) > 0 ) { |
299 | buf_insert_data (filedata, buffer, len, file_size); |
300 | file_size += len; |
301 | } |
302 | fclose (fp); |
303 | assert(file_size == buf_length(filedata)); |
304 | sprintf(message, "loaded %s (size %ld == 0x%lX).", |
305 | fname, file_size, file_size); |
306 | } else { |
307 | filedata = buf_new_from_file(fp); |
308 | file_size = buf_length(filedata); |
309 | sprintf(message, "opened %s (size %ld == 0x%lX).", |
310 | fname, file_size, file_size); |
311 | } |
312 | new_file = FALSE; |
313 | } else { |
314 | if (look_mode || fix_mode) { |
315 | fprintf(stderr, "%s: file %s not found, and %s mode active\n", |
316 | pname, fname, (look_mode ? "LOOK" : "FIX")); |
317 | exit (1); |
318 | } |
319 | filedata = buf_new_empty(); |
320 | sprintf(message, "New file %s.", fname); |
321 | new_file = TRUE; |
322 | } |
323 | } |
324 | |
325 | /* |
326 | * Save the file. Return TRUE on success, FALSE on error. |
327 | */ |
328 | int save_file (void) { |
329 | FILE *fp; |
330 | long pos = 0; |
331 | |
332 | if (look_mode) |
333 | return FALSE; /* do nothing! */ |
334 | |
335 | if ( (fp = fopen (filename, "wb")) ) { |
336 | static char buffer[SAVE_BLKSIZ]; |
337 | |
338 | while (pos < file_size) { |
339 | long size = file_size - pos; |
340 | if (size > SAVE_BLKSIZ) |
341 | size = SAVE_BLKSIZ; |
342 | |
343 | buf_fetch_data (filedata, buffer, size, pos); |
344 | if (size != fwrite (buffer, 1, size, fp)) { |
345 | fclose (fp); |
346 | return FALSE; |
347 | } |
348 | pos += size; |
349 | } |
350 | } else |
351 | return FALSE; |
352 | fclose (fp); |
353 | return TRUE; |
354 | } |
355 | |
356 | /* |
357 | * Make a backup of the file, if such has not already been done. |
358 | * Return TRUE on success, FALSE on error. |
359 | */ |
360 | int backup_file (void) { |
361 | char backup_name[FILENAME_MAX]; |
362 | |
363 | if (new_file) |
364 | return TRUE; /* unnecessary - pretend it's done */ |
365 | strcpy (backup_name, filename); |
366 | #if defined(unix) && !defined(GO32) |
367 | strcat (backup_name, ".bak"); |
368 | #elif defined(MSDOS) |
369 | { |
370 | char *p, *q; |
371 | |
372 | q = NULL; |
373 | for (p = backup_name; *p; p++) { |
374 | if (*p == '\\') |
375 | q = NULL; |
376 | else if (*p == '.') |
377 | q = p; |
378 | } |
379 | if (!q) |
380 | q = p; |
381 | strcpy (q, ".BAK"); |
382 | } |
383 | #endif |
384 | remove (backup_name); /* don't care if this fails */ |
385 | return !rename (filename, backup_name); |
386 | } |
387 | |
388 | static unsigned char *scrbuf = NULL; |
389 | static int scrbuflines = 0; |
390 | |
391 | /* |
392 | * Draw the screen, for normal usage. |
393 | */ |
394 | void draw_scr (void) { |
395 | int scrsize, scroff, llen, i, j; |
396 | long currpos; |
397 | int marktop, markbot, mark; |
398 | char *p; |
399 | unsigned char c, *q; |
400 | char *linebuf; |
401 | |
402 | scrlines = display_rows - 2; |
403 | if (scrlines > scrbuflines) { |
404 | scrbuf = (scrbuf ? |
405 | realloc(scrbuf, scrlines*width) : |
406 | malloc(scrlines*width)); |
407 | if (!scrbuf) { |
408 | done(); |
409 | fprintf(stderr, "%s: out of memory!\n", pname); |
410 | exit (2); |
411 | } |
412 | scrbuflines = scrlines; |
413 | } |
414 | |
415 | linebuf = malloc(width*4+20); |
416 | if (!linebuf) { |
417 | done(); |
418 | fprintf(stderr, "%s: out of memory!\n", pname); |
419 | exit (2); |
420 | } |
421 | memset (linebuf, ' ', width*4+13); |
422 | linebuf[width*4+13] = '\0'; |
423 | |
424 | if (top_pos == 0) |
425 | scroff = width - offset; |
426 | else |
427 | scroff = 0; |
428 | scrsize = scrlines * width - scroff; |
429 | if (scrsize > file_size - top_pos) |
430 | scrsize = file_size - top_pos; |
431 | |
432 | buf_fetch_data (filedata, scrbuf, scrsize, top_pos); |
433 | |
434 | scrsize += scroff; /* hack but it'll work */ |
435 | |
436 | mark = marking && (cur_pos != mark_point); |
437 | if (mark) { |
438 | if (cur_pos > mark_point) |
439 | marktop = mark_point, markbot = cur_pos; |
440 | else |
441 | marktop = cur_pos, markbot = mark_point; |
442 | } else |
443 | marktop = markbot = 0; /* placate gcc */ |
444 | |
445 | currpos = top_pos; |
446 | q = scrbuf; |
447 | |
448 | for (i=0; i<scrlines; i++) { |
449 | display_moveto (i, 0); |
450 | if (currpos<=cur_pos || currpos<file_size) { |
451 | p = hex[(currpos >> 24) & 0xFF]; |
452 | linebuf[0]=p[0]; |
453 | linebuf[1]=p[1]; |
454 | p = hex[(currpos >> 16) & 0xFF]; |
455 | linebuf[2]=p[0]; |
456 | linebuf[3]=p[1]; |
457 | p = hex[(currpos >> 8) & 0xFF]; |
458 | linebuf[4]=p[0]; |
459 | linebuf[5]=p[1]; |
460 | p = hex[currpos & 0xFF]; |
461 | linebuf[6]=p[0]; |
462 | linebuf[7]=p[1]; |
463 | for (j=0; j<width; j++) { |
464 | if (scrsize > 0) { |
465 | if (currpos == 0 && j < width-offset) |
466 | p = " ", c = ' '; |
467 | else |
468 | p = hex[*q], c = *q++; |
469 | scrsize--; |
470 | } else { |
471 | p = " ", c = ' '; |
472 | } |
473 | linebuf[11+3*j]=p[0]; |
474 | linebuf[12+3*j]=p[1]; |
475 | linebuf[13+3*width+j]=toprint[c]; |
476 | } |
477 | llen = (currpos ? width : offset); |
478 | if (mark && currpos<markbot && currpos+llen>marktop) { |
479 | /* |
480 | * Some of this line is marked. Maybe all. Whatever |
481 | * the precise details, there will be two regions |
482 | * requiring highlighting: a hex bit and an ascii |
483 | * bit. |
484 | */ |
485 | int localstart= (currpos<marktop?marktop:currpos) - currpos; |
486 | int localstop = (currpos+llen>markbot ? markbot : |
487 | currpos+llen) - currpos; |
488 | localstart += width-llen; |
489 | localstop += width-llen; |
490 | display_write_chars(linebuf, 11+3*localstart); |
491 | display_set_colour(COL_SELECT); |
492 | display_write_chars(linebuf+11+3*localstart, |
493 | 3*(localstop-localstart)-1); |
494 | display_set_colour(COL_BUFFER); |
495 | if (ascii_enabled) { |
496 | display_write_chars(linebuf+10+3*localstop, |
497 | 3+3*width+localstart-3*localstop); |
498 | display_set_colour(COL_SELECT); |
499 | display_write_chars(linebuf+13+3*width+localstart, |
500 | localstop-localstart); |
501 | display_set_colour(COL_BUFFER); |
502 | display_write_chars(linebuf+13+3*width+localstop, |
503 | width-localstop); |
504 | } else { |
505 | display_write_chars(linebuf+10+3*localstop, |
506 | 2+3*width-3*localstop); |
507 | } |
508 | } else |
509 | display_write_chars(linebuf, |
510 | ascii_enabled ? 13+4*width : 10+3*width); |
511 | } |
512 | currpos += (currpos ? width : offset); |
513 | display_clear_to_eol(); |
514 | } |
515 | |
516 | { |
517 | char status[80]; |
518 | int slen; |
519 | display_moveto (display_rows-2, 0); |
520 | display_set_colour(COL_STATUS); |
521 | sprintf(status, statfmt, |
522 | (modified ? "**" : " "), |
523 | filename, |
524 | (insert_mode ? "(Insert)" : |
525 | look_mode ? "(LOOK) " : |
526 | fix_mode ? "(FIX) " : "(Ovrwrt)"), |
527 | cur_pos, file_size); |
528 | slen = strlen(status); |
529 | if (slen > display_cols) |
530 | slen = display_cols; |
531 | display_write_chars(status, slen); |
532 | while (slen++ < display_cols) |
533 | display_write_str(" "); |
534 | display_set_colour(COL_BUFFER); |
535 | } |
536 | |
537 | display_moveto (display_rows-1, 0); |
538 | display_write_str (message); |
539 | display_clear_to_eol(); |
540 | message[0] = '\0'; |
541 | |
542 | i = cur_pos - top_pos; |
543 | if (top_pos == 0) |
544 | i += width - offset; |
545 | j = (edit_type ? (i%width)*3+10+edit_type : (i%width)+13+3*width); |
546 | if (j >= display_cols) |
547 | j = display_cols-1; |
548 | free (linebuf); |
549 | display_moveto (i/width, j); |
550 | display_refresh (); |
551 | } |
552 | |
553 | /* |
554 | * Get a string, in the "minibuffer". Return TRUE on success, FALSE |
555 | * on break. Possibly syntax-highlight the entered string for |
556 | * backslash-escapes, depending on the "highlight" parameter. |
557 | */ |
558 | int get_str (char *prompt, char *buf, int highlight) { |
559 | int maxlen = 79 - strlen(prompt); /* limit to 80 - who cares? :) */ |
560 | int len = 0; |
561 | int c; |
562 | |
563 | for (EVER) { |
564 | display_moveto (display_rows-1, 0); |
565 | display_set_colour (COL_MINIBUF); |
566 | display_write_str (prompt); |
567 | if (highlight) { |
568 | char *q, *p = buf, *r = buf+len; |
569 | while (p<r) { |
570 | q = p; |
571 | if (*p == '\\') { |
572 | p++; |
573 | if (p<r && *p == '\\') |
574 | p++, display_set_colour(COL_ESCAPE); |
575 | else if (p>=r || !isxdigit (*p)) |
576 | display_set_colour(COL_INVALID); |
577 | else if (p+1>=r || !isxdigit (p[1])) |
578 | p++, display_set_colour(COL_INVALID); |
579 | else |
580 | p+=2, display_set_colour(COL_ESCAPE); |
581 | } else { |
582 | while (p<r && *p != '\\') |
583 | p++; |
584 | display_set_colour (COL_MINIBUF); |
585 | } |
586 | display_write_chars (q, p-q); |
587 | } |
588 | } else |
589 | display_write_chars (buf, len); |
590 | display_set_colour (COL_MINIBUF); |
591 | display_clear_to_eol(); |
592 | display_refresh(); |
593 | if (update_required) |
594 | update(); |
595 | safe_update = TRUE; |
596 | c = display_getkey(); |
597 | safe_update = FALSE; |
598 | if (c == 13 || c == 10) { |
599 | buf[len] = '\0'; |
600 | return TRUE; |
601 | } else if (c == 27 || c == 7) { |
602 | display_beep(); |
603 | display_post_error(); |
604 | strcpy (message, "User Break!"); |
605 | return FALSE; |
606 | } |
607 | |
608 | if (c >= 32 && c <= 126) { |
609 | if (len < maxlen) |
610 | buf[len++] = c; |
611 | else |
612 | display_beep(); |
613 | } |
614 | |
615 | if ((c == 127 || c == 8) && len > 0) |
616 | len--; |
617 | |
618 | if (c == 'U'-'@') /* ^U kill line */ |
619 | len = 0; |
620 | } |
621 | } |
622 | |
623 | /* |
624 | * Take a buffer containing possible backslash-escapes, and return |
625 | * a buffer containing a (binary!) string. Since the string is |
626 | * binary, it cannot be null terminated: hence the length is |
627 | * returned from the function. The string is processed in place. |
628 | * |
629 | * Escapes are simple: a backslash followed by two hex digits |
630 | * represents that character; a doubled backslash represents a |
631 | * backslash itself; a backslash followed by anything else is |
632 | * invalid. (-1 is returned if an invalid sequence is detected.) |
633 | */ |
634 | int parse_quoted (char *buffer) { |
635 | char *p, *q; |
636 | |
637 | p = q = buffer; |
638 | while (*p) { |
639 | while (*p && *p != '\\') |
640 | *q++ = *p++; |
641 | if (*p == '\\') { |
642 | p++; |
643 | if (*p == '\\') |
644 | *q++ = *p++; |
645 | else if (p[1] && isxdigit(*p) && isxdigit(p[1])) { |
646 | char buf[3]; |
647 | buf[0] = *p++; |
648 | buf[1] = *p++; |
649 | buf[2] = '\0'; |
650 | *q++ = strtol(buf, NULL, 16); |
651 | } else |
652 | return -1; |
653 | } |
654 | } |
655 | return q - buffer; |
656 | } |
657 | |
658 | /* |
659 | * Suspend program. (Or shell out, depending on OS, of course.) |
660 | */ |
661 | void suspend(void) { |
662 | #if defined(unix) && !defined(GO32) |
663 | done(); |
664 | raise (SIGTSTP); |
665 | init(); |
666 | #elif defined(MSDOS) |
667 | done(); |
668 | spawnl (P_WAIT, getenv("COMSPEC"), "", NULL); |
669 | init(); |
670 | #else |
671 | display_beep(); |
672 | strcpy(message, "Suspend function not yet implemented."); |
673 | #endif |
674 | } |
675 | |
676 | volatile int safe_update, update_required; |
677 | |
678 | void update (void) { |
679 | display_recheck_size(); |
680 | fix_offset (); |
681 | draw_scr (); |
682 | } |
683 | |
684 | void schedule_update(void) { |
685 | if (safe_update) |
686 | update(); |
687 | else |
688 | update_required = TRUE; |
689 | } |
690 | |
691 | long parse_num (char *buffer, int *error) { |
692 | if (error) |
693 | *error = FALSE; |
694 | if (!buffer[strspn(buffer, "0123456789")]) { |
695 | /* interpret as decimal */ |
696 | return atoi(buffer); |
697 | } else if (buffer[0]=='0' && (buffer[1]=='X' || buffer[1]=='x') && |
698 | !buffer[2+strspn(buffer+2,"0123456789ABCDEFabcdef")]) { |
699 | return strtol(buffer+2, NULL, 16); |
700 | } else if (buffer[0]=='$' && |
701 | !buffer[1+strspn(buffer+1,"0123456789ABCDEFabcdef")]) { |
702 | return strtol(buffer+1, NULL, 16); |
703 | } else { |
704 | return 0; |
705 | if (error) |
706 | *error = TRUE; |
707 | } |
708 | } |