filecomplete.c revision 1.45
1 /* $NetBSD: filecomplete.c,v 1.45 2017/04/21 05:38:03 abhinav Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jaromir Dolecek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include "config.h" 33 #if !defined(lint) && !defined(SCCSID) 34 __RCSID("$NetBSD: filecomplete.c,v 1.45 2017/04/21 05:38:03 abhinav Exp $"); 35 #endif /* not lint && not SCCSID */ 36 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 #include <dirent.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <limits.h> 43 #include <pwd.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #include "el.h" 50 #include "filecomplete.h" 51 52 static const wchar_t break_chars[] = L" \t\n\"\\'`@$><=;|&{("; 53 54 /********************************/ 55 /* completion functions */ 56 57 /* 58 * does tilde expansion of strings of type ``~user/foo'' 59 * if ``user'' isn't valid user name or ``txt'' doesn't start 60 * w/ '~', returns pointer to strdup()ed copy of ``txt'' 61 * 62 * it's the caller's responsibility to free() the returned string 63 */ 64 char * 65 fn_tilde_expand(const char *txt) 66 { 67 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT) 68 struct passwd pwres; 69 char pwbuf[1024]; 70 #endif 71 struct passwd *pass; 72 char *temp; 73 size_t len = 0; 74 75 if (txt[0] != '~') 76 return strdup(txt); 77 78 temp = strchr(txt + 1, '/'); 79 if (temp == NULL) { 80 temp = strdup(txt + 1); 81 if (temp == NULL) 82 return NULL; 83 } else { 84 /* text until string after slash */ 85 len = (size_t)(temp - txt + 1); 86 temp = el_malloc(len * sizeof(*temp)); 87 if (temp == NULL) 88 return NULL; 89 (void)strncpy(temp, txt + 1, len - 2); 90 temp[len - 2] = '\0'; 91 } 92 if (temp[0] == 0) { 93 #ifdef HAVE_GETPW_R_POSIX 94 if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf), 95 &pass) != 0) 96 pass = NULL; 97 #elif HAVE_GETPW_R_DRAFT 98 pass = getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf)); 99 #else 100 pass = getpwuid(getuid()); 101 #endif 102 } else { 103 #ifdef HAVE_GETPW_R_POSIX 104 if (getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf), &pass) != 0) 105 pass = NULL; 106 #elif HAVE_GETPW_R_DRAFT 107 pass = getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf)); 108 #else 109 pass = getpwnam(temp); 110 #endif 111 } 112 el_free(temp); /* value no more needed */ 113 if (pass == NULL) 114 return strdup(txt); 115 116 /* update pointer txt to point at string immedially following */ 117 /* first slash */ 118 txt += len; 119 120 len = strlen(pass->pw_dir) + 1 + strlen(txt) + 1; 121 temp = el_malloc(len * sizeof(*temp)); 122 if (temp == NULL) 123 return NULL; 124 (void)snprintf(temp, len, "%s/%s", pass->pw_dir, txt); 125 126 return temp; 127 } 128 129 130 /* 131 * return first found file name starting by the ``text'' or NULL if no 132 * such file can be found 133 * value of ``state'' is ignored 134 * 135 * it's the caller's responsibility to free the returned string 136 */ 137 char * 138 fn_filename_completion_function(const char *text, int state) 139 { 140 static DIR *dir = NULL; 141 static char *filename = NULL, *dirname = NULL, *dirpath = NULL; 142 static size_t filename_len = 0; 143 struct dirent *entry; 144 char *temp; 145 size_t len; 146 147 if (state == 0 || dir == NULL) { 148 temp = strrchr(text, '/'); 149 if (temp) { 150 char *nptr; 151 temp++; 152 nptr = el_realloc(filename, (strlen(temp) + 1) * 153 sizeof(*nptr)); 154 if (nptr == NULL) { 155 el_free(filename); 156 filename = NULL; 157 return NULL; 158 } 159 filename = nptr; 160 (void)strcpy(filename, temp); 161 len = (size_t)(temp - text); /* including last slash */ 162 163 nptr = el_realloc(dirname, (len + 1) * 164 sizeof(*nptr)); 165 if (nptr == NULL) { 166 el_free(dirname); 167 dirname = NULL; 168 return NULL; 169 } 170 dirname = nptr; 171 (void)strncpy(dirname, text, len); 172 dirname[len] = '\0'; 173 } else { 174 el_free(filename); 175 if (*text == 0) 176 filename = NULL; 177 else { 178 filename = strdup(text); 179 if (filename == NULL) 180 return NULL; 181 } 182 el_free(dirname); 183 dirname = NULL; 184 } 185 186 if (dir != NULL) { 187 (void)closedir(dir); 188 dir = NULL; 189 } 190 191 /* support for ``~user'' syntax */ 192 193 el_free(dirpath); 194 dirpath = NULL; 195 if (dirname == NULL) { 196 if ((dirname = strdup("")) == NULL) 197 return NULL; 198 dirpath = strdup("./"); 199 } else if (*dirname == '~') 200 dirpath = fn_tilde_expand(dirname); 201 else 202 dirpath = strdup(dirname); 203 204 if (dirpath == NULL) 205 return NULL; 206 207 dir = opendir(dirpath); 208 if (!dir) 209 return NULL; /* cannot open the directory */ 210 211 /* will be used in cycle */ 212 filename_len = filename ? strlen(filename) : 0; 213 } 214 215 /* find the match */ 216 while ((entry = readdir(dir)) != NULL) { 217 /* skip . and .. */ 218 if (entry->d_name[0] == '.' && (!entry->d_name[1] 219 || (entry->d_name[1] == '.' && !entry->d_name[2]))) 220 continue; 221 if (filename_len == 0) 222 break; 223 /* otherwise, get first entry where first */ 224 /* filename_len characters are equal */ 225 if (entry->d_name[0] == filename[0] 226 #if HAVE_STRUCT_DIRENT_D_NAMLEN 227 && entry->d_namlen >= filename_len 228 #else 229 && strlen(entry->d_name) >= filename_len 230 #endif 231 && strncmp(entry->d_name, filename, 232 filename_len) == 0) 233 break; 234 } 235 236 if (entry) { /* match found */ 237 238 #if HAVE_STRUCT_DIRENT_D_NAMLEN 239 len = entry->d_namlen; 240 #else 241 len = strlen(entry->d_name); 242 #endif 243 244 len = strlen(dirname) + len + 1; 245 temp = el_malloc(len * sizeof(*temp)); 246 if (temp == NULL) 247 return NULL; 248 (void)snprintf(temp, len, "%s%s", dirname, entry->d_name); 249 } else { 250 (void)closedir(dir); 251 dir = NULL; 252 temp = NULL; 253 } 254 255 return temp; 256 } 257 258 259 static const char * 260 append_char_function(const char *name) 261 { 262 struct stat stbuf; 263 char *expname = *name == '~' ? fn_tilde_expand(name) : NULL; 264 const char *rs = " "; 265 266 if (stat(expname ? expname : name, &stbuf) == -1) 267 goto out; 268 if (S_ISDIR(stbuf.st_mode)) 269 rs = "/"; 270 out: 271 if (expname) 272 el_free(expname); 273 return rs; 274 } 275 /* 276 * returns list of completions for text given 277 * non-static for readline. 278 */ 279 char ** completion_matches(const char *, char *(*)(const char *, int)); 280 char ** 281 completion_matches(const char *text, char *(*genfunc)(const char *, int)) 282 { 283 char **match_list = NULL, *retstr, *prevstr; 284 size_t match_list_len, max_equal, which, i; 285 size_t matches; 286 287 matches = 0; 288 match_list_len = 1; 289 while ((retstr = (*genfunc) (text, (int)matches)) != NULL) { 290 /* allow for list terminator here */ 291 if (matches + 3 >= match_list_len) { 292 char **nmatch_list; 293 while (matches + 3 >= match_list_len) 294 match_list_len <<= 1; 295 nmatch_list = el_realloc(match_list, 296 match_list_len * sizeof(*nmatch_list)); 297 if (nmatch_list == NULL) { 298 el_free(match_list); 299 return NULL; 300 } 301 match_list = nmatch_list; 302 303 } 304 match_list[++matches] = retstr; 305 } 306 307 if (!match_list) 308 return NULL; /* nothing found */ 309 310 /* find least denominator and insert it to match_list[0] */ 311 which = 2; 312 prevstr = match_list[1]; 313 max_equal = strlen(prevstr); 314 for (; which <= matches; which++) { 315 for (i = 0; i < max_equal && 316 prevstr[i] == match_list[which][i]; i++) 317 continue; 318 max_equal = i; 319 } 320 321 retstr = el_malloc((max_equal + 1) * sizeof(*retstr)); 322 if (retstr == NULL) { 323 el_free(match_list); 324 return NULL; 325 } 326 (void)strncpy(retstr, match_list[1], max_equal); 327 retstr[max_equal] = '\0'; 328 match_list[0] = retstr; 329 330 /* add NULL as last pointer to the array */ 331 match_list[matches + 1] = NULL; 332 333 return match_list; 334 } 335 336 /* 337 * Sort function for qsort(). Just wrapper around strcasecmp(). 338 */ 339 static int 340 _fn_qsort_string_compare(const void *i1, const void *i2) 341 { 342 const char *s1 = ((const char * const *)i1)[0]; 343 const char *s2 = ((const char * const *)i2)[0]; 344 345 return strcasecmp(s1, s2); 346 } 347 348 /* 349 * Display list of strings in columnar format on readline's output stream. 350 * 'matches' is list of strings, 'num' is number of strings in 'matches', 351 * 'width' is maximum length of string in 'matches'. 352 * 353 * matches[0] is not one of the match strings, but it is counted in 354 * num, so the strings are matches[1] *through* matches[num-1]. 355 */ 356 void 357 fn_display_match_list(EditLine * el, char **matches, size_t num, size_t width, 358 const char *(*app_func) (const char *)) 359 { 360 size_t line, lines, col, cols, thisguy; 361 int screenwidth = el->el_terminal.t_size.h; 362 if (app_func == NULL) 363 app_func = append_char_function; 364 365 /* Ignore matches[0]. Avoid 1-based array logic below. */ 366 matches++; 367 num--; 368 369 /* 370 * Find out how many entries can be put on one line; count 371 * with one space between strings the same way it's printed. 372 */ 373 cols = (size_t)screenwidth / (width + 1); 374 if (cols == 0) 375 cols = 1; 376 377 /* how many lines of output, rounded up */ 378 lines = (num + cols - 1) / cols; 379 380 /* Sort the items. */ 381 qsort(matches, num, sizeof(char *), _fn_qsort_string_compare); 382 383 /* 384 * On the ith line print elements i, i+lines, i+lines*2, etc. 385 */ 386 for (line = 0; line < lines; line++) { 387 for (col = 0; col < cols; col++) { 388 thisguy = line + col * lines; 389 if (thisguy >= num) 390 break; 391 (void)fprintf(el->el_outfile, "%s%s%s", 392 col == 0 ? "" : " ", matches[thisguy], 393 append_char_function(matches[thisguy])); 394 (void)fprintf(el->el_outfile, "%-*s", 395 (int) (width - strlen(matches[thisguy])), ""); 396 } 397 (void)fprintf(el->el_outfile, "\n"); 398 } 399 } 400 401 /* 402 * Complete the word at or before point, 403 * 'what_to_do' says what to do with the completion. 404 * \t means do standard completion. 405 * `?' means list the possible completions. 406 * `*' means insert all of the possible completions. 407 * `!' means to do standard completion, and list all possible completions if 408 * there is more than one. 409 * 410 * Note: '*' support is not implemented 411 * '!' could never be invoked 412 */ 413 int 414 fn_complete(EditLine *el, 415 char *(*complet_func)(const char *, int), 416 char **(*attempted_completion_function)(const char *, int, int), 417 const wchar_t *word_break, const wchar_t *special_prefixes, 418 const char *(*app_func)(const char *), size_t query_items, 419 int *completion_type, int *over, int *point, int *end) 420 { 421 const LineInfoW *li; 422 wchar_t *temp; 423 char **matches; 424 const wchar_t *ctemp; 425 size_t len; 426 int what_to_do = '\t'; 427 int retval = CC_NORM; 428 429 if (el->el_state.lastcmd == el->el_state.thiscmd) 430 what_to_do = '?'; 431 432 /* readline's rl_complete() has to be told what we did... */ 433 if (completion_type != NULL) 434 *completion_type = what_to_do; 435 436 if (!complet_func) 437 complet_func = fn_filename_completion_function; 438 if (!app_func) 439 app_func = append_char_function; 440 441 /* We now look backwards for the start of a filename/variable word */ 442 li = el_wline(el); 443 ctemp = li->cursor; 444 while (ctemp > li->buffer 445 && !wcschr(word_break, ctemp[-1]) 446 && (!special_prefixes || !wcschr(special_prefixes, ctemp[-1]) ) ) 447 ctemp--; 448 449 len = (size_t)(li->cursor - ctemp); 450 temp = el_malloc((len + 1) * sizeof(*temp)); 451 (void)wcsncpy(temp, ctemp, len); 452 temp[len] = '\0'; 453 454 /* these can be used by function called in completion_matches() */ 455 /* or (*attempted_completion_function)() */ 456 if (point != NULL) 457 *point = (int)(li->cursor - li->buffer); 458 if (end != NULL) 459 *end = (int)(li->lastchar - li->buffer); 460 461 if (attempted_completion_function) { 462 int cur_off = (int)(li->cursor - li->buffer); 463 matches = (*attempted_completion_function)( 464 ct_encode_string(temp, &el->el_scratch), 465 cur_off - (int)len, cur_off); 466 } else 467 matches = NULL; 468 if (!attempted_completion_function || 469 (over != NULL && !*over && !matches)) 470 matches = completion_matches( 471 ct_encode_string(temp, &el->el_scratch), complet_func); 472 473 if (over != NULL) 474 *over = 0; 475 476 if (matches) { 477 int i; 478 size_t matches_num, maxlen, match_len, match_display=1; 479 480 retval = CC_REFRESH; 481 /* 482 * Only replace the completed string with common part of 483 * possible matches if there is possible completion. 484 */ 485 if (matches[0][0] != '\0') { 486 el_deletestr(el, (int) len); 487 el_winsertstr(el, 488 ct_decode_string(matches[0], &el->el_scratch)); 489 } 490 491 492 if (matches[2] == NULL && 493 (matches[1] == NULL || strcmp(matches[0], matches[1]) == 0)) { 494 /* 495 * We found exact match. Add a space after 496 * it, unless we do filename completion and the 497 * object is a directory. 498 */ 499 el_winsertstr(el, 500 ct_decode_string((*app_func)(matches[0]), 501 &el->el_scratch)); 502 } else if (what_to_do == '!' || what_to_do == '?') { 503 /* 504 * More than one match and requested to list possible 505 * matches. 506 */ 507 508 for(i = 1, maxlen = 0; matches[i]; i++) { 509 match_len = strlen(matches[i]); 510 if (match_len > maxlen) 511 maxlen = match_len; 512 } 513 /* matches[1] through matches[i-1] are available */ 514 matches_num = (size_t)(i - 1); 515 516 /* newline to get on next line from command line */ 517 (void)fprintf(el->el_outfile, "\n"); 518 519 /* 520 * If there are too many items, ask user for display 521 * confirmation. 522 */ 523 if (matches_num > query_items) { 524 (void)fprintf(el->el_outfile, 525 "Display all %zu possibilities? (y or n) ", 526 matches_num); 527 (void)fflush(el->el_outfile); 528 if (getc(stdin) != 'y') 529 match_display = 0; 530 (void)fprintf(el->el_outfile, "\n"); 531 } 532 533 if (match_display) { 534 /* 535 * Interface of this function requires the 536 * strings be matches[1..num-1] for compat. 537 * We have matches_num strings not counting 538 * the prefix in matches[0], so we need to 539 * add 1 to matches_num for the call. 540 */ 541 fn_display_match_list(el, matches, 542 matches_num+1, maxlen, app_func); 543 } 544 retval = CC_REDISPLAY; 545 } else if (matches[0][0]) { 546 /* 547 * There was some common match, but the name was 548 * not complete enough. Next tab will print possible 549 * completions. 550 */ 551 el_beep(el); 552 } else { 553 /* lcd is not a valid object - further specification */ 554 /* is needed */ 555 el_beep(el); 556 retval = CC_NORM; 557 } 558 559 /* free elements of array and the array itself */ 560 for (i = 0; matches[i]; i++) 561 el_free(matches[i]); 562 el_free(matches); 563 matches = NULL; 564 } 565 el_free(temp); 566 return retval; 567 } 568 569 /* 570 * el-compatible wrapper around rl_complete; needed for key binding 571 */ 572 /* ARGSUSED */ 573 unsigned char 574 _el_fn_complete(EditLine *el, int ch __attribute__((__unused__))) 575 { 576 return (unsigned char)fn_complete(el, NULL, NULL, 577 break_chars, NULL, NULL, (size_t)100, 578 NULL, NULL, NULL, NULL); 579 } 580
Indexes created Wed Sep 24 15:09:51 GMT 2025