1 /* $NetBSD: histedit.c,v 1.44 2011/07/12 16:40:41 joerg 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 1.44 2011/07/12 16:40:41 joerg 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 "builtins.h" 57 #include "main.h" 58 #include "output.h" 59 #include "mystring.h" 60 #include "myhistedit.h" 61 #include "error.h" 62 #ifndef SMALL 63 #include "eval.h" 64 #include "memalloc.h" 65 66 #define MAXHISTLOOPS 4 /* max recursions through fc */ 67 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ 68 69 History *hist; /* history cookie */ 70 EditLine *el; /* editline cookie */ 71 int displayhist; 72 static FILE *el_in, *el_out; 73 unsigned char _el_fn_complete(EditLine *, int); 74 75 STATIC const char *fc_replace(const char *, char *, char *); 76 77 #ifdef DEBUG 78 extern FILE *tracefile; 79 #endif 80 81 /* 82 * Set history and editing status. Called whenever the status may 83 * have changed (figures out what to do). 84 */ 85 void 86 histedit(void) 87 { 88 FILE *el_err; 89 90 #define editing (Eflag || Vflag) 91 92 if (iflag == 1) { 93 if (!hist) { 94 /* 95 * turn history on 96 */ 97 INTOFF; 98 hist = history_init(); 99 INTON; 100 101 if (hist != NULL) 102 sethistsize(histsizeval()); 103 else 104 out2str("sh: can't initialize history\n"); 105 } 106 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ 107 /* 108 * turn editing on 109 */ 110 char *term, *shname; 111 112 INTOFF; 113 if (el_in == NULL) 114 el_in = fdopen(0, "r"); 115 if (el_out == NULL) 116 el_out = fdopen(2, "w"); 117 if (el_in == NULL || el_out == NULL) 118 goto bad; 119 el_err = el_out; 120 #if DEBUG 121 if (tracefile) 122 el_err = tracefile; 123 #endif 124 term = lookupvar("TERM"); 125 if (term) 126 setenv("TERM", term, 1); 127 else 128 unsetenv("TERM"); 129 shname = arg0; 130 if (shname[0] == '-') 131 shname++; 132 el = el_init(shname, el_in, el_out, el_err); 133 if (el != NULL) { 134 if (hist) 135 el_set(el, EL_HIST, history, hist); 136 el_set(el, EL_PROMPT, getprompt); 137 el_set(el, EL_SIGNAL, 1); 138 el_set(el, EL_ADDFN, "rl-complete", 139 "ReadLine compatible completion function", 140 _el_fn_complete); 141 } else { 142 bad: 143 out2str("sh: can't initialize editing\n"); 144 } 145 INTON; 146 } else if (!editing && el) { 147 INTOFF; 148 el_end(el); 149 el = NULL; 150 INTON; 151 } 152 if (el) { 153 el_source(el, NULL); 154 if (Vflag) 155 el_set(el, EL_EDITOR, "vi"); 156 else if (Eflag) 157 el_set(el, EL_EDITOR, "emacs"); 158 el_set(el, EL_BIND, "^I", 159 tabcomplete ? "rl-complete" : "ed-insert", NULL); 160 } 161 } else { 162 INTOFF; 163 if (el) { /* no editing if not interactive */ 164 el_end(el); 165 el = NULL; 166 } 167 if (hist) { 168 history_end(hist); 169 hist = NULL; 170 } 171 INTON; 172 } 173 } 174 175 176 void 177 sethistsize(const char *hs) 178 { 179 int histsize; 180 HistEvent he; 181 182 if (hist != NULL) { 183 if (hs == NULL || *hs == '\0' || 184 (histsize = atoi(hs)) < 0) 185 histsize = 100; 186 history(hist, &he, H_SETSIZE, histsize); 187 history(hist, &he, H_SETUNIQUE, 1); 188 } 189 } 190 191 void 192 setterm(const char *term) 193 { 194 if (el != NULL && term != NULL) 195 if (el_set(el, EL_TERMINAL, term) != 0) { 196 outfmt(out2, "sh: Can't set terminal type %s\n", term); 197 outfmt(out2, "sh: Using dumb terminal settings.\n"); 198 } 199 } 200 201 int 202 inputrc(argc, argv) 203 int argc; 204 char **argv; 205 { 206 if (argc != 2) { 207 out2str("usage: inputrc file\n"); 208 return 1; 209 } 210 if (el != NULL) { 211 if (el_source(el, argv[1])) { 212 out2str("inputrc: failed\n"); 213 return 1; 214 } else 215 return 0; 216 } else { 217 out2str("sh: inputrc ignored, not editing\n"); 218 return 1; 219 } 220 } 221 222 /* 223 * This command is provided since POSIX decided to standardize 224 * the Korn shell fc command. Oh well... 225 */ 226 int 227 histcmd(int argc, char **argv) 228 { 229 int ch; 230 const char * volatile editor = NULL; 231 HistEvent he; 232 int lflg = 0; 233 volatile int nflg = 0, rflg = 0, sflg = 0; 234 int i, retval; 235 const char *firststr, *laststr; 236 int first, last, direction; 237 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 238 static int active = 0; 239 struct jmploc jmploc; 240 struct jmploc *volatile savehandler; 241 char editfile[MAXPATHLEN + 1]; 242 FILE *efp; 243 #ifdef __GNUC__ 244 repl = NULL; /* XXX gcc4 */ 245 efp = NULL; /* XXX gcc4 */ 246 #endif 247 248 if (hist == NULL) 249 error("history not active"); 250 251 if (argc == 1) 252 error("missing history argument"); 253 254 optreset = 1; optind = 1; /* initialize getopt */ 255 while (not_fcnumber(argv[optind]) && 256 (ch = getopt(argc, argv, ":e:lnrs")) != -1) 257 switch ((char)ch) { 258 case 'e': 259 editor = optionarg; 260 break; 261 case 'l': 262 lflg = 1; 263 break; 264 case 'n': 265 nflg = 1; 266 break; 267 case 'r': 268 rflg = 1; 269 break; 270 case 's': 271 sflg = 1; 272 break; 273 case ':': 274 error("option -%c expects argument", optopt); 275 /* NOTREACHED */ 276 case '?': 277 default: 278 error("unknown option: -%c", optopt); 279 /* NOTREACHED */ 280 } 281 argc -= optind, argv += optind; 282 283 /* 284 * If executing... 285 */ 286 if (lflg == 0 || editor || sflg) { 287 lflg = 0; /* ignore */ 288 editfile[0] = '\0'; 289 /* 290 * Catch interrupts to reset active counter and 291 * cleanup temp files. 292 */ 293 savehandler = handler; 294 if (setjmp(jmploc.loc)) { 295 active = 0; 296 if (*editfile) 297 unlink(editfile); 298 handler = savehandler; 299 longjmp(handler->loc, 1); 300 } 301 handler = &jmploc; 302 if (++active > MAXHISTLOOPS) { 303 active = 0; 304 displayhist = 0; 305 error("called recursively too many times"); 306 } 307 /* 308 * Set editor. 309 */ 310 if (sflg == 0) { 311 if (editor == NULL && 312 (editor = bltinlookup("FCEDIT", 1)) == NULL && 313 (editor = bltinlookup("EDITOR", 1)) == NULL) 314 editor = DEFEDITOR; 315 if (editor[0] == '-' && editor[1] == '\0') { 316 sflg = 1; /* no edit */ 317 editor = NULL; 318 } 319 } 320 } 321 322 /* 323 * If executing, parse [old=new] now 324 */ 325 if (lflg == 0 && argc > 0 && 326 ((repl = strchr(argv[0], '=')) != NULL)) { 327 pat = argv[0]; 328 *repl++ = '\0'; 329 argc--, argv++; 330 } 331 332 /* 333 * If -s is specified, accept only one operand 334 */ 335 if (sflg && argc >= 2) 336 error("too many args"); 337 338 /* 339 * determine [first] and [last] 340 */ 341 switch (argc) { 342 case 0: 343 firststr = lflg ? "-16" : "-1"; 344 laststr = "-1"; 345 break; 346 case 1: 347 firststr = argv[0]; 348 laststr = lflg ? "-1" : argv[0]; 349 break; 350 case 2: 351 firststr = argv[0]; 352 laststr = argv[1]; 353 break; 354 default: 355 error("too many args"); 356 /* NOTREACHED */ 357 } 358 /* 359 * Turn into event numbers. 360 */ 361 first = str_to_event(firststr, 0); 362 last = str_to_event(laststr, 1); 363 364 if (rflg) { 365 i = last; 366 last = first; 367 first = i; 368 } 369 /* 370 * XXX - this should not depend on the event numbers 371 * always increasing. Add sequence numbers or offset 372 * to the history element in next (diskbased) release. 373 */ 374 direction = first < last ? H_PREV : H_NEXT; 375 376 /* 377 * If editing, grab a temp file. 378 */ 379 if (editor) { 380 int fd; 381 INTOFF; /* easier */ 382 snprintf(editfile, sizeof(editfile), "%s_shXXXXXX", _PATH_TMP); 383 if ((fd = mkstemp(editfile)) < 0) 384 error("can't create temporary file %s", editfile); 385 if ((efp = fdopen(fd, "w")) == NULL) { 386 close(fd); 387 error("can't allocate stdio buffer for temp"); 388 } 389 } 390 391 /* 392 * Loop through selected history events. If listing or executing, 393 * do it now. Otherwise, put into temp file and call the editor 394 * after. 395 * 396 * The history interface needs rethinking, as the following 397 * convolutions will demonstrate. 398 */ 399 history(hist, &he, H_FIRST); 400 retval = history(hist, &he, H_NEXT_EVENT, first); 401 for (;retval != -1; retval = history(hist, &he, direction)) { 402 if (lflg) { 403 if (!nflg) 404 out1fmt("%5d ", he.num); 405 out1str(he.str); 406 } else { 407 const char *s = pat ? 408 fc_replace(he.str, pat, repl) : he.str; 409 410 if (sflg) { 411 if (displayhist) { 412 out2str(s); 413 } 414 415 evalstring(strcpy(stalloc(strlen(s) + 1), s), 0); 416 if (displayhist && hist) { 417 /* 418 * XXX what about recursive and 419 * relative histnums. 420 */ 421 history(hist, &he, H_ENTER, s); 422 } 423 424 break; 425 } else 426 fputs(s, efp); 427 } 428 /* 429 * At end? (if we were to lose last, we'd sure be 430 * messed up). 431 */ 432 if (he.num == last) 433 break; 434 } 435 if (editor) { 436 char *editcmd; 437 438 fclose(efp); 439 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 440 sprintf(editcmd, "%s %s", editor, editfile); 441 evalstring(editcmd, 0); /* XXX - should use no JC command */ 442 INTON; 443 readcmdfile(editfile); /* XXX - should read back - quick tst */ 444 unlink(editfile); 445 } 446 447 if (lflg == 0 && active > 0) 448 --active; 449 if (displayhist) 450 displayhist = 0; 451 return 0; 452 } 453 454 STATIC const char * 455 fc_replace(const char *s, char *p, char *r) 456 { 457 char *dest; 458 int plen = strlen(p); 459 460 STARTSTACKSTR(dest); 461 while (*s) { 462 if (*s == *p && strncmp(s, p, plen) == 0) { 463 while (*r) 464 STPUTC(*r++, dest); 465 s += plen; 466 *p = '\0'; /* so no more matches */ 467 } else 468 STPUTC(*s++, dest); 469 } 470 STACKSTRNUL(dest); 471 dest = grabstackstr(dest); 472 473 return (dest); 474 } 475 476 int 477 not_fcnumber(char *s) 478 { 479 if (s == NULL) 480 return 0; 481 if (*s == '-') 482 s++; 483 return (!is_number(s)); 484 } 485 486 int 487 str_to_event(const char *str, int last) 488 { 489 HistEvent he; 490 const char *s = str; 491 int relative = 0; 492 int i, retval; 493 494 retval = history(hist, &he, H_FIRST); 495 switch (*s) { 496 case '-': 497 relative = 1; 498 /*FALLTHROUGH*/ 499 case '+': 500 s++; 501 } 502 if (is_number(s)) { 503 i = atoi(s); 504 if (relative) { 505 while (retval != -1 && i--) { 506 retval = history(hist, &he, H_NEXT); 507 } 508 if (retval == -1) 509 retval = history(hist, &he, H_LAST); 510 } else { 511 retval = history(hist, &he, H_NEXT_EVENT, i); 512 if (retval == -1) { 513 /* 514 * the notion of first and last is 515 * backwards to that of the history package 516 */ 517 retval = history(hist, &he, 518 last ? H_FIRST : H_LAST); 519 } 520 } 521 if (retval == -1) 522 error("history number %s not found (internal error)", 523 str); 524 } else { 525 /* 526 * pattern 527 */ 528 retval = history(hist, &he, H_PREV_STR, str); 529 if (retval == -1) 530 error("history pattern not found: %s", str); 531 } 532 return (he.num); 533 } 534 #else 535 int 536 histcmd(int argc, char **argv) 537 { 538 error("not compiled with history support"); 539 /* NOTREACHED */ 540 } 541 int 542 inputrc(int argc, char **argv) 543 { 544 error("not compiled with history support"); 545 /* NOTREACHED */ 546 } 547 #endif 548