| 1 | /* |
| 2 | * TODO possibly after that: |
| 3 | * |
| 4 | * - Need to handle >2Gb files! Up the `filesize' type to long |
| 5 | * long, and use it everywhere (not just in buffer.c). |
| 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 |
| 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. |
| 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. |
| 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. |
| 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 |
| 62 | * (yikes!), or other situations where you actually cannot |
| 63 | * create a fresh copy of the file and rename(2) it into |
| 64 | * place. |
| 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 | } |