1 /* $NetBSD: histedit.c,v 1.39 2006/05/10 21:53:14 mrg 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 1.39 2006/05/10 21:53:14 mrg 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 if (Vflag) 153 el_set(el, EL_EDITOR, "vi"); 154 else if (Eflag) 155 el_set(el, EL_EDITOR, "emacs"); 156 el_set(el, EL_BIND, "^I", 157 tabcomplete ? "rl-complete" : "ed-insert", NULL); 158 el_source(el, 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 } 187 } 188 189 void 190 setterm(const char *term) 191 { 192 if (el != NULL && term != NULL) 193 if (el_set(el, EL_TERMINAL, term) != 0) { 194 outfmt(out2, "sh: Can't set terminal type %s\n", term); 195 outfmt(out2, "sh: Using dumb terminal settings.\n"); 196 } 197 } 198 199 int 200 inputrc(argc, argv) 201 int argc; 202 char **argv; 203 { 204 if (argc != 2) { 205 out2str("usage: inputrc file\n"); 206 return 1; 207 } 208 if (el != NULL) { 209 if (el_source(el, argv[1])) { 210 out2str("inputrc: failed\n"); 211 return 1; 212 } else 213 return 0; 214 } else { 215 out2str("sh: inputrc ignored, not editing\n"); 216 return 1; 217 } 218 } 219 220 /* 221 * This command is provided since POSIX decided to standardize 222 * the Korn shell fc command. Oh well... 223 */ 224 int 225 histcmd(int argc, char **argv) 226 { 227 int ch; 228 const char *editor = NULL; 229 HistEvent he; 230 int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 231 int i, retval; 232 const char *firststr, *laststr; 233 int first, last, direction; 234 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 235 static int active = 0; 236 struct jmploc jmploc; 237 struct jmploc *volatile savehandler; 238 char editfile[MAXPATHLEN + 1]; 239 FILE *efp; 240 #ifdef __GNUC__ 241 /* Avoid longjmp clobbering */ 242 (void) &editor; 243 (void) &lflg; 244 (void) &nflg; 245 (void) &rflg; 246 (void) &sflg; 247 (void) &firststr; 248 (void) &laststr; 249 (void) &pat; 250 (void) &repl; 251 (void) &efp; 252 (void) &argc; 253 (void) &argv; 254 repl = NULL; /* XXX gcc4 */ 255 efp = NULL; /* XXX gcc4 */ 256 #endif 257 258 if (hist == NULL) 259 error("history not active"); 260 261 if (argc == 1) 262 error("missing history argument"); 263 264 optreset = 1; optind = 1; /* initialize getopt */ 265 while (not_fcnumber(argv[optind]) && 266 (ch = getopt(argc, argv, ":e:lnrs")) != -1) 267 switch ((char)ch) { 268 case 'e': 269 editor = optionarg; 270 break; 271 case 'l': 272 lflg = 1; 273 break; 274 case 'n': 275 nflg = 1; 276 break; 277 case 'r': 278 rflg = 1; 279 break; 280 case 's': 281 sflg = 1; 282 break; 283 case ':': 284 error("option -%c expects argument", optopt); 285 /* NOTREACHED */ 286 case '?': 287 default: 288 error("unknown option: -%c", optopt); 289 /* NOTREACHED */ 290 } 291 argc -= optind, argv += optind; 292 293 /* 294 * If executing... 295 */ 296 if (lflg == 0 || editor || sflg) { 297 lflg = 0; /* ignore */ 298 editfile[0] = '\0'; 299 /* 300 * Catch interrupts to reset active counter and 301 * cleanup temp files. 302 */ 303 if (setjmp(jmploc.loc)) { 304 active = 0; 305 if (*editfile) 306 unlink(editfile); 307 handler = savehandler; 308 longjmp(handler->loc, 1); 309 } 310 savehandler = handler; 311 handler = &jmploc; 312 if (++active > MAXHISTLOOPS) { 313 active = 0; 314 displayhist = 0; 315 error("called recursively too many times"); 316 } 317 /* 318 * Set editor. 319 */ 320 if (sflg == 0) { 321 if (editor == NULL && 322 (editor = bltinlookup("FCEDIT", 1)) == NULL && 323 (editor = bltinlookup("EDITOR", 1)) == NULL) 324 editor = DEFEDITOR; 325 if (editor[0] == '-' && editor[1] == '\0') { 326 sflg = 1; /* no edit */ 327 editor = NULL; 328 } 329 } 330 } 331 332 /* 333 * If executing, parse [old=new] now 334 */ 335 if (lflg == 0 && argc > 0 && 336 ((repl = strchr(argv[0], '=')) != NULL)) { 337 pat = argv[0]; 338 *repl++ = '\0'; 339 argc--, argv++; 340 } 341 342 /* 343 * If -s is specified, accept only one operand 344 */ 345 if (sflg && argc >= 2) 346 error("too many args"); 347 348 /* 349 * determine [first] and [last] 350 */ 351 switch (argc) { 352 case 0: 353 firststr = lflg ? "-16" : "-1"; 354 laststr = "-1"; 355 break; 356 case 1: 357 firststr = argv[0]; 358 laststr = lflg ? "-1" : argv[0]; 359 break; 360 case 2: 361 firststr = argv[0]; 362 laststr = argv[1]; 363 break; 364 default: 365 error("too many args"); 366 /* NOTREACHED */ 367 } 368 /* 369 * Turn into event numbers. 370 */ 371 first = str_to_event(firststr, 0); 372 last = str_to_event(laststr, 1); 373 374 if (rflg) { 375 i = last; 376 last = first; 377 first = i; 378 } 379 /* 380 * XXX - this should not depend on the event numbers 381 * always increasing. Add sequence numbers or offset 382 * to the history element in next (diskbased) release. 383 */ 384 direction = first < last ? H_PREV : H_NEXT; 385 386 /* 387 * If editing, grab a temp file. 388 */ 389 if (editor) { 390 int fd; 391 INTOFF; /* easier */ 392 snprintf(editfile, sizeof(editfile), "%s_shXXXXXX", _PATH_TMP); 393 if ((fd = mkstemp(editfile)) < 0) 394 error("can't create temporary file %s", editfile); 395 if ((efp = fdopen(fd, "w")) == NULL) { 396 close(fd); 397 error("can't allocate stdio buffer for temp"); 398 } 399 } 400 401 /* 402 * Loop through selected history events. If listing or executing, 403 * do it now. Otherwise, put into temp file and call the editor 404 * after. 405 * 406 * The history interface needs rethinking, as the following 407 * convolutions will demonstrate. 408 */ 409 history(hist, &he, H_FIRST); 410 retval = history(hist, &he, H_NEXT_EVENT, first); 411 for (;retval != -1; retval = history(hist, &he, direction)) { 412 if (lflg) { 413 if (!nflg) 414 out1fmt("%5d ", he.num); 415 out1str(he.str); 416 } else { 417 const char *s = pat ? 418 fc_replace(he.str, pat, repl) : he.str; 419 420 if (sflg) { 421 if (displayhist) { 422 out2str(s); 423 } 424 425 evalstring(strcpy(stalloc(strlen(s) + 1), s), 0); 426 if (displayhist && hist) { 427 /* 428 * XXX what about recursive and 429 * relative histnums. 430 */ 431 history(hist, &he, H_ENTER, s); 432 } 433 434 break; 435 } else 436 fputs(s, efp); 437 } 438 /* 439 * At end? (if we were to lose last, we'd sure be 440 * messed up). 441 */ 442 if (he.num == last) 443 break; 444 } 445 if (editor) { 446 char *editcmd; 447 448 fclose(efp); 449 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 450 sprintf(editcmd, "%s %s", editor, editfile); 451 evalstring(editcmd, 0); /* XXX - should use no JC command */ 452 INTON; 453 readcmdfile(editfile); /* XXX - should read back - quick tst */ 454 unlink(editfile); 455 } 456 457 if (lflg == 0 && active > 0) 458 --active; 459 if (displayhist) 460 displayhist = 0; 461 return 0; 462 } 463 464 STATIC const char * 465 fc_replace(const char *s, char *p, char *r) 466 { 467 char *dest; 468 int plen = strlen(p); 469 470 STARTSTACKSTR(dest); 471 while (*s) { 472 if (*s == *p && strncmp(s, p, plen) == 0) { 473 while (*r) 474 STPUTC(*r++, dest); 475 s += plen; 476 *p = '\0'; /* so no more matches */ 477 } else 478 STPUTC(*s++, dest); 479 } 480 STACKSTRNUL(dest); 481 dest = grabstackstr(dest); 482 483 return (dest); 484 } 485 486 int 487 not_fcnumber(char *s) 488 { 489 if (s == NULL) 490 return 0; 491 if (*s == '-') 492 s++; 493 return (!is_number(s)); 494 } 495 496 int 497 str_to_event(const char *str, int last) 498 { 499 HistEvent he; 500 const char *s = str; 501 int relative = 0; 502 int i, retval; 503 504 retval = history(hist, &he, H_FIRST); 505 switch (*s) { 506 case '-': 507 relative = 1; 508 /*FALLTHROUGH*/ 509 case '+': 510 s++; 511 } 512 if (is_number(s)) { 513 i = atoi(s); 514 if (relative) { 515 while (retval != -1 && i--) { 516 retval = history(hist, &he, H_NEXT); 517 } 518 if (retval == -1) 519 retval = history(hist, &he, H_LAST); 520 } else { 521 retval = history(hist, &he, H_NEXT_EVENT, i); 522 if (retval == -1) { 523 /* 524 * the notion of first and last is 525 * backwards to that of the history package 526 */ 527 retval = history(hist, &he, 528 last ? H_FIRST : H_LAST); 529 } 530 } 531 if (retval == -1) 532 error("history number %s not found (internal error)", 533 str); 534 } else { 535 /* 536 * pattern 537 */ 538 retval = history(hist, &he, H_PREV_STR, str); 539 if (retval == -1) 540 error("history pattern not found: %s", str); 541 } 542 return (he.num); 543 } 544 #else 545 int 546 histcmd(int argc, char **argv) 547 { 548 error("not compiled with history support"); 549 /* NOTREACHED */ 550 } 551 int 552 inputrc(int argc, char **argv) 553 { 554 error("not compiled with history support"); 555 /* NOTREACHED */ 556 } 557 #endif 558