1 /* $NetBSD: histedit.c,v 1.42 2011/01/07 22:21:56 jmmv Exp $ */ 2 3 /*- 4 * Copyright (c) 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 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 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)histedit.c 8.2 (Berkeley) 5/4/95"; 39 #else 40 __RCSID("$NetBSD: histedit.c,v 1.42 2011/01/07 22:21:56 jmmv Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 #include <paths.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <unistd.h> 49 /* 50 * Editline and history functions (and glue). 51 */ 52 #include "shell.h" 53 #include "parser.h" 54 #include "var.h" 55 #include "options.h" 56 #include "main.h" 57 #include "output.h" 58 #include "mystring.h" 59 #include "myhistedit.h" 60 #include "error.h" 61 #ifndef SMALL 62 #include "eval.h" 63 #include "memalloc.h" 64 65 #define MAXHISTLOOPS 4 /* max recursions through fc */ 66 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ 67 68 History *hist; /* history cookie */ 69 EditLine *el; /* editline cookie */ 70 int displayhist; 71 static FILE *el_in, *el_out; 72 unsigned char _el_fn_complete(EditLine *, int); 73 74 STATIC const char *fc_replace(const char *, char *, char *); 75 76 #ifdef DEBUG 77 extern FILE *tracefile; 78 #endif 79 80 /* 81 * Set history and editing status. Called whenever the status may 82 * have changed (figures out what to do). 83 */ 84 void 85 histedit(void) 86 { 87 FILE *el_err; 88 89 #define editing (Eflag || Vflag) 90 91 if (iflag == 1) { 92 if (!hist) { 93 /* 94 * turn history on 95 */ 96 INTOFF; 97 hist = history_init(); 98 INTON; 99 100 if (hist != NULL) 101 sethistsize(histsizeval()); 102 else 103 out2str("sh: can't initialize history\n"); 104 } 105 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ 106 /* 107 * turn editing on 108 */ 109 char *term, *shname; 110 111 INTOFF; 112 if (el_in == NULL) 113 el_in = fdopen(0, "r"); 114 if (el_out == NULL) 115 el_out = fdopen(2, "w"); 116 if (el_in == NULL || el_out == NULL) 117 goto bad; 118 el_err = el_out; 119 #if DEBUG 120 if (tracefile) 121 el_err = tracefile; 122 #endif 123 term = lookupvar("TERM"); 124 if (term) 125 setenv("TERM", term, 1); 126 else 127 unsetenv("TERM"); 128 shname = arg0; 129 if (shname[0] == '-') 130 shname++; 131 el = el_init(shname, el_in, el_out, el_err); 132 if (el != NULL) { 133 if (hist) 134 el_set(el, EL_HIST, history, hist); 135 el_set(el, EL_PROMPT, getprompt); 136 el_set(el, EL_SIGNAL, 1); 137 el_set(el, EL_ADDFN, "rl-complete", 138 "ReadLine compatible completion function", 139 _el_fn_complete); 140 } else { 141 bad: 142 out2str("sh: can't initialize editing\n"); 143 } 144 INTON; 145 } else if (!editing && el) { 146 INTOFF; 147 el_end(el); 148 el = NULL; 149 INTON; 150 } 151 if (el) { 152 el_source(el, NULL); 153 if (Vflag) 154 el_set(el, EL_EDITOR, "vi"); 155 else if (Eflag) 156 el_set(el, EL_EDITOR, "emacs"); 157 el_set(el, EL_BIND, "^I", 158 tabcomplete ? "rl-complete" : "ed-insert", NULL); 159 } 160 } else { 161 INTOFF; 162 if (el) { /* no editing if not interactive */ 163 el_end(el); 164 el = NULL; 165 } 166 if (hist) { 167 history_end(hist); 168 hist = NULL; 169 } 170 INTON; 171 } 172 } 173 174 175 void 176 sethistsize(const char *hs) 177 { 178 int histsize; 179 HistEvent he; 180 181 if (hist != NULL) { 182 if (hs == NULL || *hs == '\0' || 183 (histsize = atoi(hs)) < 0) 184 histsize = 100; 185 history(hist, &he, H_SETSIZE, histsize); 186 history(hist, &he, H_SETUNIQUE, 1); 187 } 188 } 189 190 void 191 setterm(const char *term) 192 { 193 if (el != NULL && term != NULL) 194 if (el_set(el, EL_TERMINAL, term) != 0) { 195 outfmt(out2, "sh: Can't set terminal type %s\n", term); 196 outfmt(out2, "sh: Using dumb terminal settings.\n"); 197 } 198 } 199 200 int 201 inputrc(argc, argv) 202 int argc; 203 char **argv; 204 { 205 if (argc != 2) { 206 out2str("usage: inputrc file\n"); 207 return 1; 208 } 209 if (el != NULL) { 210 if (el_source(el, argv[1])) { 211 out2str("inputrc: failed\n"); 212 return 1; 213 } else 214 return 0; 215 } else { 216 out2str("sh: inputrc ignored, not editing\n"); 217 return 1; 218 } 219 } 220 221 /* 222 * This command is provided since POSIX decided to standardize 223 * the Korn shell fc command. Oh well... 224 */ 225 int 226 histcmd(int argc, char **argv) 227 { 228 int ch; 229 const char * volatile editor = NULL; 230 HistEvent he; 231 int lflg = 0; 232 volatile int nflg = 0, rflg = 0, sflg = 0; 233 int i, retval; 234 const char *firststr, *laststr; 235 int first, last, direction; 236 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 237 static int active = 0; 238 struct jmploc jmploc; 239 struct jmploc *volatile savehandler; 240 char editfile[MAXPATHLEN + 1]; 241 FILE *efp; 242 #ifdef __GNUC__ 243 repl = NULL; /* XXX gcc4 */ 244 efp = NULL; /* XXX gcc4 */ 245 #endif 246 247 if (hist == NULL) 248 error("history not active"); 249 250 if (argc == 1) 251 error("missing history argument"); 252 253 optreset = 1; optind = 1; /* initialize getopt */ 254 while (not_fcnumber(argv[optind]) && 255 (ch = getopt(argc, argv, ":e:lnrs")) != -1) 256 switch ((char)ch) { 257 case 'e': 258 editor = optionarg; 259 break; 260 case 'l': 261 lflg = 1; 262 break; 263 case 'n': 264 nflg = 1; 265 break; 266 case 'r': 267 rflg = 1; 268 break; 269 case 's': 270 sflg = 1; 271 break; 272 case ':': 273 error("option -%c expects argument", optopt); 274 /* NOTREACHED */ 275 case '?': 276 default: 277 error("unknown option: -%c", optopt); 278 /* NOTREACHED */ 279 } 280 argc -= optind, argv += optind; 281 282 /* 283 * If executing... 284 */ 285 if (lflg == 0 || editor || sflg) { 286 lflg = 0; /* ignore */ 287 editfile[0] = '\0'; 288 /* 289 * Catch interrupts to reset active counter and 290 * cleanup temp files. 291 */ 292 if (setjmp(jmploc.loc)) { 293 active = 0; 294 if (*editfile) 295 unlink(editfile); 296 handler = savehandler; 297 longjmp(handler->loc, 1); 298 } 299 savehandler = handler; 300 handler = &jmploc; 301 if (++active > MAXHISTLOOPS) { 302 active = 0; 303 displayhist = 0; 304 error("called recursively too many times"); 305 } 306 /* 307 * Set editor. 308 */ 309 if (sflg == 0) { 310 if (editor == NULL && 311 (editor = bltinlookup("FCEDIT", 1)) == NULL && 312 (editor = bltinlookup("EDITOR", 1)) == NULL) 313 editor = DEFEDITOR; 314 if (editor[0] == '-' && editor[1] == '\0') { 315 sflg = 1; /* no edit */ 316 editor = NULL; 317 } 318 } 319 } 320 321 /* 322 * If executing, parse [old=new] now 323 */ 324 if (lflg == 0 && argc > 0 && 325 ((repl = strchr(argv[0], '=')) != NULL)) { 326 pat = argv[0]; 327 *repl++ = '\0'; 328 argc--, argv++; 329 } 330 331 /* 332 * If -s is specified, accept only one operand 333 */ 334 if (sflg && argc >= 2) 335 error("too many args"); 336 337 /* 338 * determine [first] and [last] 339 */ 340 switch (argc) { 341 case 0: 342 firststr = lflg ? "-16" : "-1"; 343 laststr = "-1"; 344 break; 345 case 1: 346 firststr = argv[0]; 347 laststr = lflg ? "-1" : argv[0]; 348 break; 349 case 2: 350 firststr = argv[0]; 351 laststr = argv[1]; 352 break; 353 default: 354 error("too many args"); 355 /* NOTREACHED */ 356 } 357 /* 358 * Turn into event numbers. 359 */ 360 first = str_to_event(firststr, 0); 361 last = str_to_event(laststr, 1); 362 363 if (rflg) { 364 i = last; 365 last = first; 366 first = i; 367 } 368 /* 369 * XXX - this should not depend on the event numbers 370 * always increasing. Add sequence numbers or offset 371 * to the history element in next (diskbased) release. 372 */ 373 direction = first < last ? H_PREV : H_NEXT; 374 375 /* 376 * If editing, grab a temp file. 377 */ 378 if (editor) { 379 int fd; 380 INTOFF; /* easier */ 381 snprintf(editfile, sizeof(editfile), "%s_shXXXXXX", _PATH_TMP); 382 if ((fd = mkstemp(editfile)) < 0) 383 error("can't create temporary file %s", editfile); 384 if ((efp = fdopen(fd, "w")) == NULL) { 385 close(fd); 386 error("can't allocate stdio buffer for temp"); 387 } 388 } 389 390 /* 391 * Loop through selected history events. If listing or executing, 392 * do it now. Otherwise, put into temp file and call the editor 393 * after. 394 * 395 * The history interface needs rethinking, as the following 396 * convolutions will demonstrate. 397 */ 398 history(hist, &he, H_FIRST); 399 retval = history(hist, &he, H_NEXT_EVENT, first); 400 for (;retval != -1; retval = history(hist, &he, direction)) { 401 if (lflg) { 402 if (!nflg) 403 out1fmt("%5d ", he.num); 404 out1str(he.str); 405 } else { 406 const char *s = pat ? 407 fc_replace(he.str, pat, repl) : he.str; 408 409 if (sflg) { 410 if (displayhist) { 411 out2str(s); 412 } 413 414 evalstring(strcpy(stalloc(strlen(s) + 1), s), 0); 415 if (displayhist && hist) { 416 /* 417 * XXX what about recursive and 418 * relative histnums. 419 */ 420 history(hist, &he, H_ENTER, s); 421 } 422 423 break; 424 } else 425 fputs(s, efp); 426 } 427 /* 428 * At end? (if we were to lose last, we'd sure be 429 * messed up). 430 */ 431 if (he.num == last) 432 break; 433 } 434 if (editor) { 435 char *editcmd; 436 437 fclose(efp); 438 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 439 sprintf(editcmd, "%s %s", editor, editfile); 440 evalstring(editcmd, 0); /* XXX - should use no JC command */ 441 INTON; 442 readcmdfile(editfile); /* XXX - should read back - quick tst */ 443 unlink(editfile); 444 } 445 446 if (lflg == 0 && active > 0) 447 --active; 448 if (displayhist) 449 displayhist = 0; 450 return 0; 451 } 452 453 STATIC const char * 454 fc_replace(const char *s, char *p, char *r) 455 { 456 char *dest; 457 int plen = strlen(p); 458 459 STARTSTACKSTR(dest); 460 while (*s) { 461 if (*s == *p && strncmp(s, p, plen) == 0) { 462 while (*r) 463 STPUTC(*r++, dest); 464 s += plen; 465 *p = '\0'; /* so no more matches */ 466 } else 467 STPUTC(*s++, dest); 468 } 469 STACKSTRNUL(dest); 470 dest = grabstackstr(dest); 471 472 return (dest); 473 } 474 475 int 476 not_fcnumber(char *s) 477 { 478 if (s == NULL) 479 return 0; 480 if (*s == '-') 481 s++; 482 return (!is_number(s)); 483 } 484 485 int 486 str_to_event(const char *str, int last) 487 { 488 HistEvent he; 489 const char *s = str; 490 int relative = 0; 491 int i, retval; 492 493 retval = history(hist, &he, H_FIRST); 494 switch (*s) { 495 case '-': 496 relative = 1; 497 /*FALLTHROUGH*/ 498 case '+': 499 s++; 500 } 501 if (is_number(s)) { 502 i = atoi(s); 503 if (relative) { 504 while (retval != -1 && i--) { 505 retval = history(hist, &he, H_NEXT); 506 } 507 if (retval == -1) 508 retval = history(hist, &he, H_LAST); 509 } else { 510 retval = history(hist, &he, H_NEXT_EVENT, i); 511 if (retval == -1) { 512 /* 513 * the notion of first and last is 514 * backwards to that of the history package 515 */ 516 retval = history(hist, &he, 517 last ? H_FIRST : H_LAST); 518 } 519 } 520 if (retval == -1) 521 error("history number %s not found (internal error)", 522 str); 523 } else { 524 /* 525 * pattern 526 */ 527 retval = history(hist, &he, H_PREV_STR, str); 528 if (retval == -1) 529 error("history pattern not found: %s", str); 530 } 531 return (he.num); 532 } 533 #else 534 int 535 histcmd(int argc, char **argv) 536 { 537 error("not compiled with history support"); 538 /* NOTREACHED */ 539 } 540 int 541 inputrc(int argc, char **argv) 542 { 543 error("not compiled with history support"); 544 /* NOTREACHED */ 545 } 546 #endif 547