| 1 | /* histexpand.c -- history expansion. */ |
| 2 | |
| 3 | /* Copyright (C) 1989, 1992 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file contains the GNU History Library (the Library), a set of |
| 6 | routines for managing the text of previously typed lines. |
| 7 | |
| 8 | The Library is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | The Library is distributed in the hope that it will be useful, but |
| 14 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | General Public License for more details. |
| 17 | |
| 18 | The GNU General Public License is often shipped with GNU software, and |
| 19 | is generally kept in a file called COPYING or LICENSE. If you do not |
| 20 | have a copy of the license, write to the Free Software Foundation, |
| 21 | 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
| 22 | |
| 23 | #define READLINE_LIBRARY |
| 24 | |
| 25 | #if defined (HAVE_CONFIG_H) |
| 26 | # include <config.h> |
| 27 | #endif |
| 28 | |
| 29 | #include <stdio.h> |
| 30 | |
| 31 | #if defined (HAVE_STDLIB_H) |
| 32 | # include <stdlib.h> |
| 33 | #else |
| 34 | # include "ansi_stdlib.h" |
| 35 | #endif /* HAVE_STDLIB_H */ |
| 36 | |
| 37 | #if defined (HAVE_UNISTD_H) |
| 38 | # ifndef _MINIX |
| 39 | # include <sys/types.h> |
| 40 | # endif |
| 41 | # include <unistd.h> |
| 42 | #endif |
| 43 | |
| 44 | #if defined (HAVE_STRING_H) |
| 45 | # include <string.h> |
| 46 | #else |
| 47 | # include <strings.h> |
| 48 | #endif /* !HAVE_STRING_H */ |
| 49 | |
| 50 | #include "history.h" |
| 51 | #include "histlib.h" |
| 52 | |
| 53 | #include "rlshell.h" |
| 54 | #include "xmalloc.h" |
| 55 | |
| 56 | #define HISTORY_WORD_DELIMITERS " \t\n;&()|<>" |
| 57 | #define HISTORY_QUOTE_CHARACTERS "\"'`" |
| 58 | |
| 59 | static char error_pointer; |
| 60 | |
| 61 | static char *subst_lhs; |
| 62 | static char *subst_rhs; |
| 63 | static int subst_lhs_len; |
| 64 | static int subst_rhs_len; |
| 65 | |
| 66 | static char *get_history_word_specifier __P((char *, char *, int *)); |
| 67 | static char *history_find_word __P((char *, int)); |
| 68 | |
| 69 | static char *quote_breaks __P((char *)); |
| 70 | |
| 71 | /* Variables exported by this file. */ |
| 72 | /* The character that represents the start of a history expansion |
| 73 | request. This is usually `!'. */ |
| 74 | char history_expansion_char = '!'; |
| 75 | |
| 76 | /* The character that invokes word substitution if found at the start of |
| 77 | a line. This is usually `^'. */ |
| 78 | char history_subst_char = '^'; |
| 79 | |
| 80 | /* During tokenization, if this character is seen as the first character |
| 81 | of a word, then it, and all subsequent characters upto a newline are |
| 82 | ignored. For a Bourne shell, this should be '#'. Bash special cases |
| 83 | the interactive comment character to not be a comment delimiter. */ |
| 84 | char history_comment_char = '\0'; |
| 85 | |
| 86 | /* The list of characters which inhibit the expansion of text if found |
| 87 | immediately following history_expansion_char. */ |
| 88 | char *history_no_expand_chars = " \t\n\r="; |
| 89 | |
| 90 | /* If set to a non-zero value, single quotes inhibit history expansion. |
| 91 | The default is 0. */ |
| 92 | int history_quotes_inhibit_expansion = 0; |
| 93 | |
| 94 | /* If set, this points to a function that is called to verify that a |
| 95 | particular history expansion should be performed. */ |
| 96 | Function *history_inhibit_expansion_function; |
| 97 | |
| 98 | /* **************************************************************** */ |
| 99 | /* */ |
| 100 | /* History Expansion */ |
| 101 | /* */ |
| 102 | /* **************************************************************** */ |
| 103 | |
| 104 | /* Hairy history expansion on text, not tokens. This is of general |
| 105 | use, and thus belongs in this library. */ |
| 106 | |
| 107 | /* The last string searched for by a !?string? search. */ |
| 108 | static char *search_string; |
| 109 | |
| 110 | /* The last string matched by a !?string? search. */ |
| 111 | static char *search_match; |
| 112 | |
| 113 | /* Return the event specified at TEXT + OFFSET modifying OFFSET to |
| 114 | point to after the event specifier. Just a pointer to the history |
| 115 | line is returned; NULL is returned in the event of a bad specifier. |
| 116 | You pass STRING with *INDEX equal to the history_expansion_char that |
| 117 | begins this specification. |
| 118 | DELIMITING_QUOTE is a character that is allowed to end the string |
| 119 | specification for what to search for in addition to the normal |
| 120 | characters `:', ` ', `\t', `\n', and sometimes `?'. |
| 121 | So you might call this function like: |
| 122 | line = get_history_event ("!echo:p", &index, 0); */ |
| 123 | char * |
| 124 | get_history_event (string, caller_index, delimiting_quote) |
| 125 | char *string; |
| 126 | int *caller_index; |
| 127 | int delimiting_quote; |
| 128 | { |
| 129 | register int i; |
| 130 | register char c; |
| 131 | HIST_ENTRY *entry; |
| 132 | int which, sign, local_index, substring_okay; |
| 133 | Function *search_func; |
| 134 | char *temp; |
| 135 | |
| 136 | /* The event can be specified in a number of ways. |
| 137 | |
| 138 | !! the previous command |
| 139 | !n command line N |
| 140 | !-n current command-line minus N |
| 141 | !str the most recent command starting with STR |
| 142 | !?str[?] |
| 143 | the most recent command containing STR |
| 144 | |
| 145 | All values N are determined via HISTORY_BASE. */ |
| 146 | |
| 147 | i = *caller_index; |
| 148 | |
| 149 | if (string[i] != history_expansion_char) |
| 150 | return ((char *)NULL); |
| 151 | |
| 152 | /* Move on to the specification. */ |
| 153 | i++; |
| 154 | |
| 155 | sign = 1; |
| 156 | substring_okay = 0; |
| 157 | |
| 158 | #define RETURN_ENTRY(e, w) \ |
| 159 | return ((e = history_get (w)) ? e->line : (char *)NULL) |
| 160 | |
| 161 | /* Handle !! case. */ |
| 162 | if (string[i] == history_expansion_char) |
| 163 | { |
| 164 | i++; |
| 165 | which = history_base + (history_length - 1); |
| 166 | *caller_index = i; |
| 167 | RETURN_ENTRY (entry, which); |
| 168 | } |
| 169 | |
| 170 | /* Hack case of numeric line specification. */ |
| 171 | if (string[i] == '-') |
| 172 | { |
| 173 | sign = -1; |
| 174 | i++; |
| 175 | } |
| 176 | |
| 177 | if (_rl_digit_p (string[i])) |
| 178 | { |
| 179 | /* Get the extent of the digits and compute the value. */ |
| 180 | for (which = 0; _rl_digit_p (string[i]); i++) |
| 181 | which = (which * 10) + _rl_digit_value (string[i]); |
| 182 | |
| 183 | *caller_index = i; |
| 184 | |
| 185 | if (sign < 0) |
| 186 | which = (history_length + history_base) - which; |
| 187 | |
| 188 | RETURN_ENTRY (entry, which); |
| 189 | } |
| 190 | |
| 191 | /* This must be something to search for. If the spec begins with |
| 192 | a '?', then the string may be anywhere on the line. Otherwise, |
| 193 | the string must be found at the start of a line. */ |
| 194 | if (string[i] == '?') |
| 195 | { |
| 196 | substring_okay++; |
| 197 | i++; |
| 198 | } |
| 199 | |
| 200 | /* Only a closing `?' or a newline delimit a substring search string. */ |
| 201 | for (local_index = i; c = string[i]; i++) |
| 202 | if ((!substring_okay && (whitespace (c) || c == ':' || |
| 203 | (history_search_delimiter_chars && member (c, history_search_delimiter_chars)) || |
| 204 | string[i] == delimiting_quote)) || |
| 205 | string[i] == '\n' || |
| 206 | (substring_okay && string[i] == '?')) |
| 207 | break; |
| 208 | |
| 209 | which = i - local_index; |
| 210 | temp = xmalloc (1 + which); |
| 211 | if (which) |
| 212 | strncpy (temp, string + local_index, which); |
| 213 | temp[which] = '\0'; |
| 214 | |
| 215 | if (substring_okay && string[i] == '?') |
| 216 | i++; |
| 217 | |
| 218 | *caller_index = i; |
| 219 | |
| 220 | #define FAIL_SEARCH() \ |
| 221 | do { \ |
| 222 | history_offset = history_length; free (temp) ; return (char *)NULL; \ |
| 223 | } while (0) |
| 224 | |
| 225 | /* If there is no search string, try to use the previous search string, |
| 226 | if one exists. If not, fail immediately. */ |
| 227 | if (*temp == '\0' && substring_okay) |
| 228 | { |
| 229 | if (search_string) |
| 230 | { |
| 231 | free (temp); |
| 232 | temp = savestring (search_string); |
| 233 | } |
| 234 | else |
| 235 | FAIL_SEARCH (); |
| 236 | } |
| 237 | |
| 238 | search_func = substring_okay ? history_search : history_search_prefix; |
| 239 | while (1) |
| 240 | { |
| 241 | local_index = (*search_func) (temp, -1); |
| 242 | |
| 243 | if (local_index < 0) |
| 244 | FAIL_SEARCH (); |
| 245 | |
| 246 | if (local_index == 0 || substring_okay) |
| 247 | { |
| 248 | entry = current_history (); |
| 249 | history_offset = history_length; |
| 250 | |
| 251 | /* If this was a substring search, then remember the |
| 252 | string that we matched for word substitution. */ |
| 253 | if (substring_okay) |
| 254 | { |
| 255 | FREE (search_string); |
| 256 | search_string = temp; |
| 257 | |
| 258 | FREE (search_match); |
| 259 | search_match = history_find_word (entry->line, local_index); |
| 260 | } |
| 261 | else |
| 262 | free (temp); |
| 263 | |
| 264 | return (entry->line); |
| 265 | } |
| 266 | |
| 267 | if (history_offset) |
| 268 | history_offset--; |
| 269 | else |
| 270 | FAIL_SEARCH (); |
| 271 | } |
| 272 | #undef FAIL_SEARCH |
| 273 | #undef RETURN_ENTRY |
| 274 | } |
| 275 | |
| 276 | /* Function for extracting single-quoted strings. Used for inhibiting |
| 277 | history expansion within single quotes. */ |
| 278 | |
| 279 | /* Extract the contents of STRING as if it is enclosed in single quotes. |
| 280 | SINDEX, when passed in, is the offset of the character immediately |
| 281 | following the opening single quote; on exit, SINDEX is left pointing |
| 282 | to the closing single quote. */ |
| 283 | static void |
| 284 | hist_string_extract_single_quoted (string, sindex) |
| 285 | char *string; |
| 286 | int *sindex; |
| 287 | { |
| 288 | register int i; |
| 289 | |
| 290 | for (i = *sindex; string[i] && string[i] != '\''; i++) |
| 291 | ; |
| 292 | |
| 293 | *sindex = i; |
| 294 | } |
| 295 | |
| 296 | static char * |
| 297 | quote_breaks (s) |
| 298 | char *s; |
| 299 | { |
| 300 | register char *p, *r; |
| 301 | char *ret; |
| 302 | int len = 3; |
| 303 | |
| 304 | for (p = s; p && *p; p++, len++) |
| 305 | { |
| 306 | if (*p == '\'') |
| 307 | len += 3; |
| 308 | else if (whitespace (*p) || *p == '\n') |
| 309 | len += 2; |
| 310 | } |
| 311 | |
| 312 | r = ret = xmalloc (len); |
| 313 | *r++ = '\''; |
| 314 | for (p = s; p && *p; ) |
| 315 | { |
| 316 | if (*p == '\'') |
| 317 | { |
| 318 | *r++ = '\''; |
| 319 | *r++ = '\\'; |
| 320 | *r++ = '\''; |
| 321 | *r++ = '\''; |
| 322 | p++; |
| 323 | } |
| 324 | else if (whitespace (*p) || *p == '\n') |
| 325 | { |
| 326 | *r++ = '\''; |
| 327 | *r++ = *p++; |
| 328 | *r++ = '\''; |
| 329 | } |
| 330 | else |
| 331 | *r++ = *p++; |
| 332 | } |
| 333 | *r++ = '\''; |
| 334 | *r = '\0'; |
| 335 | return ret; |
| 336 | } |
| 337 | |
| 338 | static char * |
| 339 | hist_error(s, start, current, errtype) |
| 340 | char *s; |
| 341 | int start, current, errtype; |
| 342 | { |
| 343 | char *temp, *emsg; |
| 344 | int ll, elen; |
| 345 | |
| 346 | ll = current - start; |
| 347 | |
| 348 | switch (errtype) |
| 349 | { |
| 350 | case EVENT_NOT_FOUND: |
| 351 | emsg = "event not found"; |
| 352 | elen = 15; |
| 353 | break; |
| 354 | case BAD_WORD_SPEC: |
| 355 | emsg = "bad word specifier"; |
| 356 | elen = 18; |
| 357 | break; |
| 358 | case SUBST_FAILED: |
| 359 | emsg = "substitution failed"; |
| 360 | elen = 19; |
| 361 | break; |
| 362 | case BAD_MODIFIER: |
| 363 | emsg = "unrecognized history modifier"; |
| 364 | elen = 29; |
| 365 | break; |
| 366 | case NO_PREV_SUBST: |
| 367 | emsg = "no previous substitution"; |
| 368 | elen = 24; |
| 369 | break; |
| 370 | default: |
| 371 | emsg = "unknown expansion error"; |
| 372 | elen = 23; |
| 373 | break; |
| 374 | } |
| 375 | |
| 376 | temp = xmalloc (ll + elen + 3); |
| 377 | strncpy (temp, s + start, ll); |
| 378 | temp[ll] = ':'; |
| 379 | temp[ll + 1] = ' '; |
| 380 | strcpy (temp + ll + 2, emsg); |
| 381 | return (temp); |
| 382 | } |
| 383 | |
| 384 | /* Get a history substitution string from STR starting at *IPTR |
| 385 | and return it. The length is returned in LENPTR. |
| 386 | |
| 387 | A backslash can quote the delimiter. If the string is the |
| 388 | empty string, the previous pattern is used. If there is |
| 389 | no previous pattern for the lhs, the last history search |
| 390 | string is used. |
| 391 | |
| 392 | If IS_RHS is 1, we ignore empty strings and set the pattern |
| 393 | to "" anyway. subst_lhs is not changed if the lhs is empty; |
| 394 | subst_rhs is allowed to be set to the empty string. */ |
| 395 | |
| 396 | static char * |
| 397 | get_subst_pattern (str, iptr, delimiter, is_rhs, lenptr) |
| 398 | char *str; |
| 399 | int *iptr, delimiter, is_rhs, *lenptr; |
| 400 | { |
| 401 | register int si, i, j, k; |
| 402 | char *s = (char *) NULL; |
| 403 | |
| 404 | i = *iptr; |
| 405 | |
| 406 | for (si = i; str[si] && str[si] != delimiter; si++) |
| 407 | if (str[si] == '\\' && str[si + 1] == delimiter) |
| 408 | si++; |
| 409 | |
| 410 | if (si > i || is_rhs) |
| 411 | { |
| 412 | s = xmalloc (si - i + 1); |
| 413 | for (j = 0, k = i; k < si; j++, k++) |
| 414 | { |
| 415 | /* Remove a backslash quoting the search string delimiter. */ |
| 416 | if (str[k] == '\\' && str[k + 1] == delimiter) |
| 417 | k++; |
| 418 | s[j] = str[k]; |
| 419 | } |
| 420 | s[j] = '\0'; |
| 421 | if (lenptr) |
| 422 | *lenptr = j; |
| 423 | } |
| 424 | |
| 425 | i = si; |
| 426 | if (str[i]) |
| 427 | i++; |
| 428 | *iptr = i; |
| 429 | |
| 430 | return s; |
| 431 | } |
| 432 | |
| 433 | static void |
| 434 | postproc_subst_rhs () |
| 435 | { |
| 436 | char *new; |
| 437 | int i, j, new_size; |
| 438 | |
| 439 | new = xmalloc (new_size = subst_rhs_len + subst_lhs_len); |
| 440 | for (i = j = 0; i < subst_rhs_len; i++) |
| 441 | { |
| 442 | if (subst_rhs[i] == '&') |
| 443 | { |
| 444 | if (j + subst_lhs_len >= new_size) |
| 445 | new = xrealloc (new, (new_size = new_size * 2 + subst_lhs_len)); |
| 446 | strcpy (new + j, subst_lhs); |
| 447 | j += subst_lhs_len; |
| 448 | } |
| 449 | else |
| 450 | { |
| 451 | /* a single backslash protects the `&' from lhs interpolation */ |
| 452 | if (subst_rhs[i] == '\\' && subst_rhs[i + 1] == '&') |
| 453 | i++; |
| 454 | if (j >= new_size) |
| 455 | new = xrealloc (new, new_size *= 2); |
| 456 | new[j++] = subst_rhs[i]; |
| 457 | } |
| 458 | } |
| 459 | new[j] = '\0'; |
| 460 | free (subst_rhs); |
| 461 | subst_rhs = new; |
| 462 | subst_rhs_len = j; |
| 463 | } |
| 464 | |
| 465 | /* Expand the bulk of a history specifier starting at STRING[START]. |
| 466 | Returns 0 if everything is OK, -1 if an error occurred, and 1 |
| 467 | if the `p' modifier was supplied and the caller should just print |
| 468 | the returned string. Returns the new index into string in |
| 469 | *END_INDEX_PTR, and the expanded specifier in *RET_STRING. */ |
| 470 | static int |
| 471 | history_expand_internal (string, start, end_index_ptr, ret_string, current_line) |
| 472 | char *string; |
| 473 | int start, *end_index_ptr; |
| 474 | char **ret_string; |
| 475 | char *current_line; /* for !# */ |
| 476 | { |
| 477 | int i, n, starting_index; |
| 478 | int substitute_globally, want_quotes, print_only; |
| 479 | char *event, *temp, *result, *tstr, *t, c, *word_spec; |
| 480 | int result_len; |
| 481 | |
| 482 | result = xmalloc (result_len = 128); |
| 483 | |
| 484 | i = start; |
| 485 | |
| 486 | /* If it is followed by something that starts a word specifier, |
| 487 | then !! is implied as the event specifier. */ |
| 488 | |
| 489 | if (member (string[i + 1], ":$*%^")) |
| 490 | { |
| 491 | char fake_s[3]; |
| 492 | int fake_i = 0; |
| 493 | i++; |
| 494 | fake_s[0] = fake_s[1] = history_expansion_char; |
| 495 | fake_s[2] = '\0'; |
| 496 | event = get_history_event (fake_s, &fake_i, 0); |
| 497 | } |
| 498 | else if (string[i + 1] == '#') |
| 499 | { |
| 500 | i += 2; |
| 501 | event = current_line; |
| 502 | } |
| 503 | else |
| 504 | { |
| 505 | int quoted_search_delimiter = 0; |
| 506 | |
| 507 | /* If the character before this `!' is a double or single |
| 508 | quote, then this expansion takes place inside of the |
| 509 | quoted string. If we have to search for some text ("!foo"), |
| 510 | allow the delimiter to end the search string. */ |
| 511 | if (i && (string[i - 1] == '\'' || string[i - 1] == '"')) |
| 512 | quoted_search_delimiter = string[i - 1]; |
| 513 | event = get_history_event (string, &i, quoted_search_delimiter); |
| 514 | } |
| 515 | |
| 516 | if (event == 0) |
| 517 | { |
| 518 | *ret_string = hist_error (string, start, i, EVENT_NOT_FOUND); |
| 519 | free (result); |
| 520 | return (-1); |
| 521 | } |
| 522 | |
| 523 | /* If a word specifier is found, then do what that requires. */ |
| 524 | starting_index = i; |
| 525 | word_spec = get_history_word_specifier (string, event, &i); |
| 526 | |
| 527 | /* There is no such thing as a `malformed word specifier'. However, |
| 528 | it is possible for a specifier that has no match. In that case, |
| 529 | we complain. */ |
| 530 | if (word_spec == (char *)&error_pointer) |
| 531 | { |
| 532 | *ret_string = hist_error (string, starting_index, i, BAD_WORD_SPEC); |
| 533 | free (result); |
| 534 | return (-1); |
| 535 | } |
| 536 | |
| 537 | /* If no word specifier, than the thing of interest was the event. */ |
| 538 | temp = word_spec ? savestring (word_spec) : savestring (event); |
| 539 | FREE (word_spec); |
| 540 | |
| 541 | /* Perhaps there are other modifiers involved. Do what they say. */ |
| 542 | want_quotes = substitute_globally = print_only = 0; |
| 543 | starting_index = i; |
| 544 | |
| 545 | while (string[i] == ':') |
| 546 | { |
| 547 | c = string[i + 1]; |
| 548 | |
| 549 | if (c == 'g') |
| 550 | { |
| 551 | substitute_globally = 1; |
| 552 | i++; |
| 553 | c = string[i + 1]; |
| 554 | } |
| 555 | |
| 556 | switch (c) |
| 557 | { |
| 558 | default: |
| 559 | *ret_string = hist_error (string, i+1, i+2, BAD_MODIFIER); |
| 560 | free (result); |
| 561 | free (temp); |
| 562 | return -1; |
| 563 | |
| 564 | case 'q': |
| 565 | want_quotes = 'q'; |
| 566 | break; |
| 567 | |
| 568 | case 'x': |
| 569 | want_quotes = 'x'; |
| 570 | break; |
| 571 | |
| 572 | /* :p means make this the last executed line. So we |
| 573 | return an error state after adding this line to the |
| 574 | history. */ |
| 575 | case 'p': |
| 576 | print_only++; |
| 577 | break; |
| 578 | |
| 579 | /* :t discards all but the last part of the pathname. */ |
| 580 | case 't': |
| 581 | tstr = strrchr (temp, '/'); |
| 582 | if (tstr) |
| 583 | { |
| 584 | tstr++; |
| 585 | t = savestring (tstr); |
| 586 | free (temp); |
| 587 | temp = t; |
| 588 | } |
| 589 | break; |
| 590 | |
| 591 | /* :h discards the last part of a pathname. */ |
| 592 | case 'h': |
| 593 | tstr = strrchr (temp, '/'); |
| 594 | if (tstr) |
| 595 | *tstr = '\0'; |
| 596 | break; |
| 597 | |
| 598 | /* :r discards the suffix. */ |
| 599 | case 'r': |
| 600 | tstr = strrchr (temp, '.'); |
| 601 | if (tstr) |
| 602 | *tstr = '\0'; |
| 603 | break; |
| 604 | |
| 605 | /* :e discards everything but the suffix. */ |
| 606 | case 'e': |
| 607 | tstr = strrchr (temp, '.'); |
| 608 | if (tstr) |
| 609 | { |
| 610 | t = savestring (tstr); |
| 611 | free (temp); |
| 612 | temp = t; |
| 613 | } |
| 614 | break; |
| 615 | |
| 616 | /* :s/this/that substitutes `that' for the first |
| 617 | occurrence of `this'. :gs/this/that substitutes `that' |
| 618 | for each occurrence of `this'. :& repeats the last |
| 619 | substitution. :g& repeats the last substitution |
| 620 | globally. */ |
| 621 | |
| 622 | case '&': |
| 623 | case 's': |
| 624 | { |
| 625 | char *new_event, *t; |
| 626 | int delimiter, failed, si, l_temp; |
| 627 | |
| 628 | if (c == 's') |
| 629 | { |
| 630 | if (i + 2 < (int)strlen (string)) |
| 631 | delimiter = string[i + 2]; |
| 632 | else |
| 633 | break; /* no search delimiter */ |
| 634 | |
| 635 | i += 3; |
| 636 | |
| 637 | t = get_subst_pattern (string, &i, delimiter, 0, &subst_lhs_len); |
| 638 | /* An empty substitution lhs with no previous substitution |
| 639 | uses the last search string as the lhs. */ |
| 640 | if (t) |
| 641 | { |
| 642 | FREE (subst_lhs); |
| 643 | subst_lhs = t; |
| 644 | } |
| 645 | else if (!subst_lhs) |
| 646 | { |
| 647 | if (search_string && *search_string) |
| 648 | { |
| 649 | subst_lhs = savestring (search_string); |
| 650 | subst_lhs_len = strlen (subst_lhs); |
| 651 | } |
| 652 | else |
| 653 | { |
| 654 | subst_lhs = (char *) NULL; |
| 655 | subst_lhs_len = 0; |
| 656 | } |
| 657 | } |
| 658 | |
| 659 | FREE (subst_rhs); |
| 660 | subst_rhs = get_subst_pattern (string, &i, delimiter, 1, &subst_rhs_len); |
| 661 | |
| 662 | /* If `&' appears in the rhs, it's supposed to be replaced |
| 663 | with the lhs. */ |
| 664 | if (member ('&', subst_rhs)) |
| 665 | postproc_subst_rhs (); |
| 666 | } |
| 667 | else |
| 668 | i += 2; |
| 669 | |
| 670 | /* If there is no lhs, the substitution can't succeed. */ |
| 671 | if (subst_lhs_len == 0) |
| 672 | { |
| 673 | *ret_string = hist_error (string, starting_index, i, NO_PREV_SUBST); |
| 674 | free (result); |
| 675 | free (temp); |
| 676 | return -1; |
| 677 | } |
| 678 | |
| 679 | l_temp = strlen (temp); |
| 680 | /* Ignore impossible cases. */ |
| 681 | if (subst_lhs_len > l_temp) |
| 682 | { |
| 683 | *ret_string = hist_error (string, starting_index, i, SUBST_FAILED); |
| 684 | free (result); |
| 685 | free (temp); |
| 686 | return (-1); |
| 687 | } |
| 688 | |
| 689 | /* Find the first occurrence of THIS in TEMP. */ |
| 690 | si = 0; |
| 691 | for (failed = 1; (si + subst_lhs_len) <= l_temp; si++) |
| 692 | if (STREQN (temp+si, subst_lhs, subst_lhs_len)) |
| 693 | { |
| 694 | int len = subst_rhs_len - subst_lhs_len + l_temp; |
| 695 | new_event = xmalloc (1 + len); |
| 696 | strncpy (new_event, temp, si); |
| 697 | strncpy (new_event + si, subst_rhs, subst_rhs_len); |
| 698 | strncpy (new_event + si + subst_rhs_len, |
| 699 | temp + si + subst_lhs_len, |
| 700 | l_temp - (si + subst_lhs_len)); |
| 701 | new_event[len] = '\0'; |
| 702 | free (temp); |
| 703 | temp = new_event; |
| 704 | |
| 705 | failed = 0; |
| 706 | |
| 707 | if (substitute_globally) |
| 708 | { |
| 709 | si += subst_rhs_len; |
| 710 | l_temp = strlen (temp); |
| 711 | substitute_globally++; |
| 712 | continue; |
| 713 | } |
| 714 | else |
| 715 | break; |
| 716 | } |
| 717 | |
| 718 | if (substitute_globally > 1) |
| 719 | { |
| 720 | substitute_globally = 0; |
| 721 | continue; /* don't want to increment i */ |
| 722 | } |
| 723 | |
| 724 | if (failed == 0) |
| 725 | continue; /* don't want to increment i */ |
| 726 | |
| 727 | *ret_string = hist_error (string, starting_index, i, SUBST_FAILED); |
| 728 | free (result); |
| 729 | free (temp); |
| 730 | return (-1); |
| 731 | } |
| 732 | } |
| 733 | i += 2; |
| 734 | } |
| 735 | /* Done with modfiers. */ |
| 736 | /* Believe it or not, we have to back the pointer up by one. */ |
| 737 | --i; |
| 738 | |
| 739 | if (want_quotes) |
| 740 | { |
| 741 | char *x; |
| 742 | |
| 743 | if (want_quotes == 'q') |
| 744 | x = single_quote (temp); |
| 745 | else if (want_quotes == 'x') |
| 746 | x = quote_breaks (temp); |
| 747 | else |
| 748 | x = savestring (temp); |
| 749 | |
| 750 | free (temp); |
| 751 | temp = x; |
| 752 | } |
| 753 | |
| 754 | n = strlen (temp); |
| 755 | if (n >= result_len) |
| 756 | result = xrealloc (result, n + 2); |
| 757 | strcpy (result, temp); |
| 758 | free (temp); |
| 759 | |
| 760 | *end_index_ptr = i; |
| 761 | *ret_string = result; |
| 762 | return (print_only); |
| 763 | } |
| 764 | |
| 765 | /* Expand the string STRING, placing the result into OUTPUT, a pointer |
| 766 | to a string. Returns: |
| 767 | |
| 768 | -1) If there was an error in expansion. |
| 769 | 0) If no expansions took place (or, if the only change in |
| 770 | the text was the de-slashifying of the history expansion |
| 771 | character) |
| 772 | 1) If expansions did take place |
| 773 | 2) If the `p' modifier was given and the caller should print the result |
| 774 | |
| 775 | If an error ocurred in expansion, then OUTPUT contains a descriptive |
| 776 | error message. */ |
| 777 | |
| 778 | #define ADD_STRING(s) \ |
| 779 | do \ |
| 780 | { \ |
| 781 | int sl = strlen (s); \ |
| 782 | j += sl; \ |
| 783 | if (j >= result_len) \ |
| 784 | { \ |
| 785 | while (j >= result_len) \ |
| 786 | result_len += 128; \ |
| 787 | result = xrealloc (result, result_len); \ |
| 788 | } \ |
| 789 | strcpy (result + j - sl, s); \ |
| 790 | } \ |
| 791 | while (0) |
| 792 | |
| 793 | #define ADD_CHAR(c) \ |
| 794 | do \ |
| 795 | { \ |
| 796 | if (j >= result_len - 1) \ |
| 797 | result = xrealloc (result, result_len += 64); \ |
| 798 | result[j++] = c; \ |
| 799 | result[j] = '\0'; \ |
| 800 | } \ |
| 801 | while (0) |
| 802 | |
| 803 | int |
| 804 | history_expand (hstring, output) |
| 805 | char *hstring; |
| 806 | char **output; |
| 807 | { |
| 808 | register int j; |
| 809 | int i, r, l, passc, cc, modified, eindex, only_printing; |
| 810 | char *string; |
| 811 | |
| 812 | /* The output string, and its length. */ |
| 813 | int result_len; |
| 814 | char *result; |
| 815 | |
| 816 | /* Used when adding the string. */ |
| 817 | char *temp; |
| 818 | |
| 819 | /* Setting the history expansion character to 0 inhibits all |
| 820 | history expansion. */ |
| 821 | if (history_expansion_char == 0) |
| 822 | { |
| 823 | *output = savestring (hstring); |
| 824 | return (0); |
| 825 | } |
| 826 | |
| 827 | /* Prepare the buffer for printing error messages. */ |
| 828 | result = xmalloc (result_len = 256); |
| 829 | result[0] = '\0'; |
| 830 | |
| 831 | only_printing = modified = 0; |
| 832 | l = strlen (hstring); |
| 833 | |
| 834 | /* Grovel the string. Only backslash and single quotes can quote the |
| 835 | history escape character. We also handle arg specifiers. */ |
| 836 | |
| 837 | /* Before we grovel forever, see if the history_expansion_char appears |
| 838 | anywhere within the text. */ |
| 839 | |
| 840 | /* The quick substitution character is a history expansion all right. That |
| 841 | is to say, "^this^that^" is equivalent to "!!:s^this^that^", and in fact, |
| 842 | that is the substitution that we do. */ |
| 843 | if (hstring[0] == history_subst_char) |
| 844 | { |
| 845 | string = xmalloc (l + 5); |
| 846 | |
| 847 | string[0] = string[1] = history_expansion_char; |
| 848 | string[2] = ':'; |
| 849 | string[3] = 's'; |
| 850 | strcpy (string + 4, hstring); |
| 851 | l += 4; |
| 852 | } |
| 853 | else |
| 854 | { |
| 855 | string = hstring; |
| 856 | /* If not quick substitution, still maybe have to do expansion. */ |
| 857 | |
| 858 | /* `!' followed by one of the characters in history_no_expand_chars |
| 859 | is NOT an expansion. */ |
| 860 | for (i = 0; string[i]; i++) |
| 861 | { |
| 862 | cc = string[i + 1]; |
| 863 | /* The history_comment_char, if set, appearing that the beginning |
| 864 | of a word signifies that the rest of the line should not have |
| 865 | history expansion performed on it. |
| 866 | Skip the rest of the line and break out of the loop. */ |
| 867 | if (history_comment_char && string[i] == history_comment_char && |
| 868 | (i == 0 || member (string[i - 1], HISTORY_WORD_DELIMITERS))) |
| 869 | { |
| 870 | while (string[i]) |
| 871 | i++; |
| 872 | break; |
| 873 | } |
| 874 | else if (string[i] == history_expansion_char) |
| 875 | { |
| 876 | if (!cc || member (cc, history_no_expand_chars)) |
| 877 | continue; |
| 878 | /* If the calling application has set |
| 879 | history_inhibit_expansion_function to a function that checks |
| 880 | for special cases that should not be history expanded, |
| 881 | call the function and skip the expansion if it returns a |
| 882 | non-zero value. */ |
| 883 | else if (history_inhibit_expansion_function && |
| 884 | (*history_inhibit_expansion_function) (string, i)) |
| 885 | continue; |
| 886 | else |
| 887 | break; |
| 888 | } |
| 889 | /* XXX - at some point, might want to extend this to handle |
| 890 | double quotes as well. */ |
| 891 | else if (history_quotes_inhibit_expansion && string[i] == '\'') |
| 892 | { |
| 893 | /* If this is bash, single quotes inhibit history expansion. */ |
| 894 | i++; |
| 895 | hist_string_extract_single_quoted (string, &i); |
| 896 | } |
| 897 | else if (history_quotes_inhibit_expansion && string[i] == '\\') |
| 898 | { |
| 899 | /* If this is bash, allow backslashes to quote single |
| 900 | quotes and the history expansion character. */ |
| 901 | if (cc == '\'' || cc == history_expansion_char) |
| 902 | i++; |
| 903 | } |
| 904 | } |
| 905 | |
| 906 | if (string[i] != history_expansion_char) |
| 907 | { |
| 908 | free (result); |
| 909 | *output = savestring (string); |
| 910 | return (0); |
| 911 | } |
| 912 | } |
| 913 | |
| 914 | /* Extract and perform the substitution. */ |
| 915 | for (passc = i = j = 0; i < l; i++) |
| 916 | { |
| 917 | int tchar = string[i]; |
| 918 | |
| 919 | if (passc) |
| 920 | { |
| 921 | passc = 0; |
| 922 | ADD_CHAR (tchar); |
| 923 | continue; |
| 924 | } |
| 925 | |
| 926 | if (tchar == history_expansion_char) |
| 927 | tchar = -3; |
| 928 | else if (tchar == history_comment_char) |
| 929 | tchar = -2; |
| 930 | |
| 931 | switch (tchar) |
| 932 | { |
| 933 | default: |
| 934 | ADD_CHAR (string[i]); |
| 935 | break; |
| 936 | |
| 937 | case '\\': |
| 938 | passc++; |
| 939 | ADD_CHAR (tchar); |
| 940 | break; |
| 941 | |
| 942 | case '\'': |
| 943 | { |
| 944 | /* If history_quotes_inhibit_expansion is set, single quotes |
| 945 | inhibit history expansion. */ |
| 946 | if (history_quotes_inhibit_expansion) |
| 947 | { |
| 948 | int quote, slen; |
| 949 | |
| 950 | quote = i++; |
| 951 | hist_string_extract_single_quoted (string, &i); |
| 952 | |
| 953 | slen = i - quote + 2; |
| 954 | temp = xmalloc (slen); |
| 955 | strncpy (temp, string + quote, slen); |
| 956 | temp[slen - 1] = '\0'; |
| 957 | ADD_STRING (temp); |
| 958 | free (temp); |
| 959 | } |
| 960 | else |
| 961 | ADD_CHAR (string[i]); |
| 962 | break; |
| 963 | } |
| 964 | |
| 965 | case -2: /* history_comment_char */ |
| 966 | if (i == 0 || member (string[i - 1], HISTORY_WORD_DELIMITERS)) |
| 967 | { |
| 968 | temp = xmalloc (l - i + 1); |
| 969 | strcpy (temp, string + i); |
| 970 | ADD_STRING (temp); |
| 971 | free (temp); |
| 972 | i = l; |
| 973 | } |
| 974 | else |
| 975 | ADD_CHAR (string[i]); |
| 976 | break; |
| 977 | |
| 978 | case -3: /* history_expansion_char */ |
| 979 | cc = string[i + 1]; |
| 980 | |
| 981 | /* If the history_expansion_char is followed by one of the |
| 982 | characters in history_no_expand_chars, then it is not a |
| 983 | candidate for expansion of any kind. */ |
| 984 | if (member (cc, history_no_expand_chars)) |
| 985 | { |
| 986 | ADD_CHAR (string[i]); |
| 987 | break; |
| 988 | } |
| 989 | |
| 990 | #if defined (NO_BANG_HASH_MODIFIERS) |
| 991 | /* There is something that is listed as a `word specifier' in csh |
| 992 | documentation which means `the expanded text to this point'. |
| 993 | That is not a word specifier, it is an event specifier. If we |
| 994 | don't want to allow modifiers with `!#', just stick the current |
| 995 | output line in again. */ |
| 996 | if (cc == '#') |
| 997 | { |
| 998 | if (result) |
| 999 | { |
| 1000 | temp = xmalloc (1 + strlen (result)); |
| 1001 | strcpy (temp, result); |
| 1002 | ADD_STRING (temp); |
| 1003 | free (temp); |
| 1004 | } |
| 1005 | i++; |
| 1006 | break; |
| 1007 | } |
| 1008 | #endif |
| 1009 | |
| 1010 | r = history_expand_internal (string, i, &eindex, &temp, result); |
| 1011 | if (r < 0) |
| 1012 | { |
| 1013 | *output = temp; |
| 1014 | free (result); |
| 1015 | if (string != hstring) |
| 1016 | free (string); |
| 1017 | return -1; |
| 1018 | } |
| 1019 | else |
| 1020 | { |
| 1021 | if (temp) |
| 1022 | { |
| 1023 | modified++; |
| 1024 | if (*temp) |
| 1025 | ADD_STRING (temp); |
| 1026 | free (temp); |
| 1027 | } |
| 1028 | only_printing = r == 1; |
| 1029 | i = eindex; |
| 1030 | } |
| 1031 | break; |
| 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | *output = result; |
| 1036 | if (string != hstring) |
| 1037 | free (string); |
| 1038 | |
| 1039 | if (only_printing) |
| 1040 | { |
| 1041 | add_history (result); |
| 1042 | return (2); |
| 1043 | } |
| 1044 | |
| 1045 | return (modified != 0); |
| 1046 | } |
| 1047 | |
| 1048 | /* Return a consed string which is the word specified in SPEC, and found |
| 1049 | in FROM. NULL is returned if there is no spec. The address of |
| 1050 | ERROR_POINTER is returned if the word specified cannot be found. |
| 1051 | CALLER_INDEX is the offset in SPEC to start looking; it is updated |
| 1052 | to point to just after the last character parsed. */ |
| 1053 | static char * |
| 1054 | get_history_word_specifier (spec, from, caller_index) |
| 1055 | char *spec, *from; |
| 1056 | int *caller_index; |
| 1057 | { |
| 1058 | register int i = *caller_index; |
| 1059 | int first, last; |
| 1060 | int expecting_word_spec = 0; |
| 1061 | char *result; |
| 1062 | |
| 1063 | /* The range of words to return doesn't exist yet. */ |
| 1064 | first = last = 0; |
| 1065 | result = (char *)NULL; |
| 1066 | |
| 1067 | /* If we found a colon, then this *must* be a word specification. If |
| 1068 | it isn't, then it is an error. */ |
| 1069 | if (spec[i] == ':') |
| 1070 | { |
| 1071 | i++; |
| 1072 | expecting_word_spec++; |
| 1073 | } |
| 1074 | |
| 1075 | /* Handle special cases first. */ |
| 1076 | |
| 1077 | /* `%' is the word last searched for. */ |
| 1078 | if (spec[i] == '%') |
| 1079 | { |
| 1080 | *caller_index = i + 1; |
| 1081 | return (search_match ? savestring (search_match) : savestring ("")); |
| 1082 | } |
| 1083 | |
| 1084 | /* `*' matches all of the arguments, but not the command. */ |
| 1085 | if (spec[i] == '*') |
| 1086 | { |
| 1087 | *caller_index = i + 1; |
| 1088 | result = history_arg_extract (1, '$', from); |
| 1089 | return (result ? result : savestring ("")); |
| 1090 | } |
| 1091 | |
| 1092 | /* `$' is last arg. */ |
| 1093 | if (spec[i] == '$') |
| 1094 | { |
| 1095 | *caller_index = i + 1; |
| 1096 | return (history_arg_extract ('$', '$', from)); |
| 1097 | } |
| 1098 | |
| 1099 | /* Try to get FIRST and LAST figured out. */ |
| 1100 | |
| 1101 | if (spec[i] == '-') |
| 1102 | first = 0; |
| 1103 | else if (spec[i] == '^') |
| 1104 | first = 1; |
| 1105 | else if (_rl_digit_p (spec[i]) && expecting_word_spec) |
| 1106 | { |
| 1107 | for (first = 0; _rl_digit_p (spec[i]); i++) |
| 1108 | first = (first * 10) + _rl_digit_value (spec[i]); |
| 1109 | } |
| 1110 | else |
| 1111 | return ((char *)NULL); /* no valid `first' for word specifier */ |
| 1112 | |
| 1113 | if (spec[i] == '^' || spec[i] == '*') |
| 1114 | { |
| 1115 | last = (spec[i] == '^') ? 1 : '$'; /* x* abbreviates x-$ */ |
| 1116 | i++; |
| 1117 | } |
| 1118 | else if (spec[i] != '-') |
| 1119 | last = first; |
| 1120 | else |
| 1121 | { |
| 1122 | i++; |
| 1123 | |
| 1124 | if (_rl_digit_p (spec[i])) |
| 1125 | { |
| 1126 | for (last = 0; _rl_digit_p (spec[i]); i++) |
| 1127 | last = (last * 10) + _rl_digit_value (spec[i]); |
| 1128 | } |
| 1129 | else if (spec[i] == '$') |
| 1130 | { |
| 1131 | i++; |
| 1132 | last = '$'; |
| 1133 | } |
| 1134 | else if (!spec[i] || spec[i] == ':') /* could be modifier separator */ |
| 1135 | last = -1; /* x- abbreviates x-$ omitting word `$' */ |
| 1136 | } |
| 1137 | |
| 1138 | *caller_index = i; |
| 1139 | |
| 1140 | if (last >= first || last == '$' || last < 0) |
| 1141 | result = history_arg_extract (first, last, from); |
| 1142 | |
| 1143 | return (result ? result : (char *)&error_pointer); |
| 1144 | } |
| 1145 | |
| 1146 | /* Extract the args specified, starting at FIRST, and ending at LAST. |
| 1147 | The args are taken from STRING. If either FIRST or LAST is < 0, |
| 1148 | then make that arg count from the right (subtract from the number of |
| 1149 | tokens, so that FIRST = -1 means the next to last token on the line). |
| 1150 | If LAST is `$' the last arg from STRING is used. */ |
| 1151 | char * |
| 1152 | history_arg_extract (first, last, string) |
| 1153 | int first, last; |
| 1154 | char *string; |
| 1155 | { |
| 1156 | register int i, len; |
| 1157 | char *result; |
| 1158 | int size, offset; |
| 1159 | char **list; |
| 1160 | |
| 1161 | /* XXX - think about making history_tokenize return a struct array, |
| 1162 | each struct in array being a string and a length to avoid the |
| 1163 | calls to strlen below. */ |
| 1164 | if ((list = history_tokenize (string)) == NULL) |
| 1165 | return ((char *)NULL); |
| 1166 | |
| 1167 | for (len = 0; list[len]; len++) |
| 1168 | ; |
| 1169 | |
| 1170 | if (last < 0) |
| 1171 | last = len + last - 1; |
| 1172 | |
| 1173 | if (first < 0) |
| 1174 | first = len + first - 1; |
| 1175 | |
| 1176 | if (last == '$') |
| 1177 | last = len - 1; |
| 1178 | |
| 1179 | if (first == '$') |
| 1180 | first = len - 1; |
| 1181 | |
| 1182 | last++; |
| 1183 | |
| 1184 | if (first >= len || last > len || first < 0 || last < 0 || first > last) |
| 1185 | result = ((char *)NULL); |
| 1186 | else |
| 1187 | { |
| 1188 | for (size = 0, i = first; i < last; i++) |
| 1189 | size += strlen (list[i]) + 1; |
| 1190 | result = xmalloc (size + 1); |
| 1191 | result[0] = '\0'; |
| 1192 | |
| 1193 | for (i = first, offset = 0; i < last; i++) |
| 1194 | { |
| 1195 | strcpy (result + offset, list[i]); |
| 1196 | offset += strlen (list[i]); |
| 1197 | if (i + 1 < last) |
| 1198 | { |
| 1199 | result[offset++] = ' '; |
| 1200 | result[offset] = 0; |
| 1201 | } |
| 1202 | } |
| 1203 | } |
| 1204 | |
| 1205 | for (i = 0; i < len; i++) |
| 1206 | free (list[i]); |
| 1207 | free (list); |
| 1208 | |
| 1209 | return (result); |
| 1210 | } |
| 1211 | |
| 1212 | #define slashify_in_quotes "\\`\"$" |
| 1213 | |
| 1214 | /* Parse STRING into tokens and return an array of strings. If WIND is |
| 1215 | not -1 and INDP is not null, we also want the word surrounding index |
| 1216 | WIND. The position in the returned array of strings is returned in |
| 1217 | *INDP. */ |
| 1218 | static char ** |
| 1219 | history_tokenize_internal (string, wind, indp) |
| 1220 | char *string; |
| 1221 | int wind, *indp; |
| 1222 | { |
| 1223 | char **result; |
| 1224 | register int i, start, result_index, size; |
| 1225 | int len, delimiter; |
| 1226 | |
| 1227 | /* Get a token, and stuff it into RESULT. The tokens are split |
| 1228 | exactly where the shell would split them. */ |
| 1229 | for (i = result_index = size = 0, result = (char **)NULL; string[i]; ) |
| 1230 | { |
| 1231 | delimiter = 0; |
| 1232 | |
| 1233 | /* Skip leading whitespace. */ |
| 1234 | for (; string[i] && whitespace (string[i]); i++) |
| 1235 | ; |
| 1236 | if (string[i] == 0 || string[i] == history_comment_char) |
| 1237 | return (result); |
| 1238 | |
| 1239 | start = i; |
| 1240 | |
| 1241 | if (member (string[i], "()\n")) |
| 1242 | { |
| 1243 | i++; |
| 1244 | goto got_token; |
| 1245 | } |
| 1246 | |
| 1247 | if (member (string[i], "<>;&|$")) |
| 1248 | { |
| 1249 | int peek = string[i + 1]; |
| 1250 | |
| 1251 | if (peek == string[i] && peek != '$') |
| 1252 | { |
| 1253 | if (peek == '<' && string[i + 2] == '-') |
| 1254 | i++; |
| 1255 | i += 2; |
| 1256 | goto got_token; |
| 1257 | } |
| 1258 | else |
| 1259 | { |
| 1260 | if ((peek == '&' && (string[i] == '>' || string[i] == '<')) || |
| 1261 | ((peek == '>') && (string[i] == '&')) || |
| 1262 | ((peek == '(') && (string[i] == '$'))) |
| 1263 | { |
| 1264 | i += 2; |
| 1265 | goto got_token; |
| 1266 | } |
| 1267 | } |
| 1268 | if (string[i] != '$') |
| 1269 | { |
| 1270 | i++; |
| 1271 | goto got_token; |
| 1272 | } |
| 1273 | } |
| 1274 | |
| 1275 | /* Get word from string + i; */ |
| 1276 | |
| 1277 | if (member (string[i], HISTORY_QUOTE_CHARACTERS)) |
| 1278 | delimiter = string[i++]; |
| 1279 | |
| 1280 | for (; string[i]; i++) |
| 1281 | { |
| 1282 | if (string[i] == '\\' && string[i + 1] == '\n') |
| 1283 | { |
| 1284 | i++; |
| 1285 | continue; |
| 1286 | } |
| 1287 | |
| 1288 | if (string[i] == '\\' && delimiter != '\'' && |
| 1289 | (delimiter != '"' || member (string[i], slashify_in_quotes))) |
| 1290 | { |
| 1291 | i++; |
| 1292 | continue; |
| 1293 | } |
| 1294 | |
| 1295 | if (delimiter && string[i] == delimiter) |
| 1296 | { |
| 1297 | delimiter = 0; |
| 1298 | continue; |
| 1299 | } |
| 1300 | |
| 1301 | if (!delimiter && (member (string[i], HISTORY_WORD_DELIMITERS))) |
| 1302 | break; |
| 1303 | |
| 1304 | if (!delimiter && member (string[i], HISTORY_QUOTE_CHARACTERS)) |
| 1305 | delimiter = string[i]; |
| 1306 | } |
| 1307 | |
| 1308 | got_token: |
| 1309 | |
| 1310 | /* If we are looking for the word in which the character at a |
| 1311 | particular index falls, remember it. */ |
| 1312 | if (indp && wind != -1 && wind >= start && wind < i) |
| 1313 | *indp = result_index; |
| 1314 | |
| 1315 | len = i - start; |
| 1316 | if (result_index + 2 >= size) |
| 1317 | result = (char **)xrealloc (result, ((size += 10) * sizeof (char *))); |
| 1318 | result[result_index] = xmalloc (1 + len); |
| 1319 | strncpy (result[result_index], string + start, len); |
| 1320 | result[result_index][len] = '\0'; |
| 1321 | result[++result_index] = (char *)NULL; |
| 1322 | } |
| 1323 | |
| 1324 | return (result); |
| 1325 | } |
| 1326 | |
| 1327 | /* Return an array of tokens, much as the shell might. The tokens are |
| 1328 | parsed out of STRING. */ |
| 1329 | char ** |
| 1330 | history_tokenize (string) |
| 1331 | char *string; |
| 1332 | { |
| 1333 | return (history_tokenize_internal (string, -1, (int *)NULL)); |
| 1334 | } |
| 1335 | |
| 1336 | /* Find and return the word which contains the character at index IND |
| 1337 | in the history line LINE. Used to save the word matched by the |
| 1338 | last history !?string? search. */ |
| 1339 | static char * |
| 1340 | history_find_word (line, ind) |
| 1341 | char *line; |
| 1342 | int ind; |
| 1343 | { |
| 1344 | char **words, *s; |
| 1345 | int i, wind; |
| 1346 | |
| 1347 | words = history_tokenize_internal (line, ind, &wind); |
| 1348 | if (wind == -1) |
| 1349 | return ((char *)NULL); |
| 1350 | s = words[wind]; |
| 1351 | for (i = 0; i < wind; i++) |
| 1352 | free (words[i]); |
| 1353 | for (i = wind + 1; words[i]; i++) |
| 1354 | free (words[i]); |
| 1355 | free (words); |
| 1356 | return s; |
| 1357 | } |