1 /* $NetBSD: histedit.c,v 1.40 2006/10/16 00:36:19 christos 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 1.40 2006/10/16 00:36:19 christos 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 * volatile editor = NULL; 229 HistEvent he; 230 int lflg = 0; 231 volatile int nflg = 0, rflg = 0, sflg = 0; 232 int i, retval; 233 const char *firststr, *laststr; 234 int first, last, direction; 235 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 236 static int active = 0; 237 struct jmploc jmploc; 238 struct jmploc *volatile savehandler; 239 char editfile[MAXPATHLEN + 1]; 240 FILE *efp; 241 #ifdef __GNUC__ 242 repl = NULL; /* XXX gcc4 */ 243 efp = NULL; /* XXX gcc4 */ 244 #endif 245 246 if (hist == NULL) 247 error("history not active"); 248 249 if (argc == 1) 250 error("missing history argument"); 251 252 optreset = 1; optind = 1; /* initialize getopt */ 253 while (not_fcnumber(argv[optind]) && 254 (ch = getopt(argc, argv, ":e:lnrs")) != -1) 255 switch ((char)ch) { 256 case 'e': 257 editor = optionarg; 258 break; 259 case 'l': 260 lflg = 1; 261 break; 262 case 'n': 263 nflg = 1; 264 break; 265 case 'r': 266 rflg = 1; 267 break; 268 case 's': 269 sflg = 1; 270 break; 271 case ':': 272 error("option -%c expects argument", optopt); 273 /* NOTREACHED */ 274 case '?': 275 default: 276 error("unknown option: -%c", optopt); 277 /* NOTREACHED */ 278 } 279 argc -= optind, argv += optind; 280 281 /* 282 * If executing... 283 */ 284 if (lflg == 0 || editor || sflg) { 285 lflg = 0; /* ignore */ 286 editfile[0] = '\0'; 287 /* 288 * Catch interrupts to reset active counter and 289 * cleanup temp files. 290 */ 291 if (setjmp(jmploc.loc)) { 292 active = 0; 293 if (*editfile) 294 unlink(editfile); 295 handler = savehandler; 296 longjmp(handler->loc, 1); 297 } 298 savehandler = handler; 299 handler = &jmploc; 300 if (++active > MAXHISTLOOPS) { 301 active = 0; 302 displayhist = 0; 303 error("called recursively too many times"); 304 } 305 /* 306 * Set editor. 307 */ 308 if (sflg == 0) { 309 if (editor == NULL && 310 (editor = bltinlookup("FCEDIT", 1)) == NULL && 311 (editor = bltinlookup("EDITOR", 1)) == NULL) 312 editor = DEFEDITOR; 313 if (editor[0] == '-' && editor[1] == '\0') { 314 sflg = 1; /* no edit */ 315 editor = NULL; 316 } 317 } 318 } 319 320 /* 321 * If executing, parse [old=new] now 322 */ 323 if (lflg == 0 && argc > 0 && 324 ((repl = strchr(argv[0], '=')) != NULL)) { 325 pat = argv[0]; 326 *repl++ = '\0'; 327 argc--, argv++; 328 } 329 330 /* 331 * If -s is specified, accept only one operand 332 */ 333 if (sflg && argc >= 2) 334 error("too many args"); 335 336 /* 337 * determine [first] and [last] 338 */ 339 switch (argc) { 340 case 0: 341 firststr = lflg ? "-16" : "-1"; 342 laststr = "-1"; 343 break; 344 case 1: 345 firststr = argv[0]; 346 laststr = lflg ? "-1" : argv[0]; 347 break; 348 case 2: 349 firststr = argv[0]; 350 laststr = argv[1]; 351 break; 352 default: 353 error("too many args"); 354 /* NOTREACHED */ 355 } 356 /* 357 * Turn into event numbers. 358 */ 359 first = str_to_event(firststr, 0); 360 last = str_to_event(laststr, 1); 361 362 if (rflg) { 363 i = last; 364 last = first; 365 first = i; 366 } 367 /* 368 * XXX - this should not depend on the event numbers 369 * always increasing. Add sequence numbers or offset 370 * to the history element in next (diskbased) release. 371 */ 372 direction = first < last ? H_PREV : H_NEXT; 373 374 /* 375 * If editing, grab a temp file. 376 */ 377 if (editor) { 378 int fd; 379 INTOFF; /* easier */ 380 snprintf(editfile, sizeof(editfile), "%s_shXXXXXX", _PATH_TMP); 381 if ((fd = mkstemp(editfile)) < 0) 382 error("can't create temporary file %s", editfile); 383 if ((efp = fdopen(fd, "w")) == NULL) { 384 close(fd); 385 error("can't allocate stdio buffer for temp"); 386 } 387 } 388 389 /* 390 * Loop through selected history events. If listing or executing, 391 * do it now. Otherwise, put into temp file and call the editor 392 * after. 393 * 394 * The history interface needs rethinking, as the following 395 * convolutions will demonstrate. 396 */ 397 history(hist, &he, H_FIRST); 398 retval = history(hist, &he, H_NEXT_EVENT, first); 399 for (;retval != -1; retval = history(hist, &he, direction)) { 400 if (lflg) { 401 if (!nflg) 402 out1fmt("%5d ", he.num); 403 out1str(he.str); 404 } else { 405 const char *s = pat ? 406 fc_replace(he.str, pat, repl) : he.str; 407 408 if (sflg) { 409 if (displayhist) { 410 out2str(s); 411 } 412 413 evalstring(strcpy(stalloc(strlen(s) + 1), s), 0); 414 if (displayhist && hist) { 415 /* 416 * XXX what about recursive and 417 * relative histnums. 418 */ 419 history(hist, &he, H_ENTER, s); 420 } 421 422 break; 423 } else 424 fputs(s, efp); 425 } 426 /* 427 * At end? (if we were to lose last, we'd sure be 428 * messed up). 429 */ 430 if (he.num == last) 431 break; 432 } 433 if (editor) { 434 char *editcmd; 435 436 fclose(efp); 437 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 438 sprintf(editcmd, "%s %s", editor, editfile); 439 evalstring(editcmd, 0); /* XXX - should use no JC command */ 440 INTON; 441 readcmdfile(editfile); /* XXX - should read back - quick tst */ 442 unlink(editfile); 443 } 444 445 if (lflg == 0 && active > 0) 446 --active; 447 if (displayhist) 448 displayhist = 0; 449 return 0; 450 } 451 452 STATIC const char * 453 fc_replace(const char *s, char *p, char *r) 454 { 455 char *dest; 456 int plen = strlen(p); 457 458 STARTSTACKSTR(dest); 459 while (*s) { 460 if (*s == *p && strncmp(s, p, plen) == 0) { 461 while (*r) 462 STPUTC(*r++, dest); 463 s += plen; 464 *p = '\0'; /* so no more matches */ 465 } else 466 STPUTC(*s++, dest); 467 } 468 STACKSTRNUL(dest); 469 dest = grabstackstr(dest); 470 471 return (dest); 472 } 473 474 int 475 not_fcnumber(char *s) 476 { 477 if (s == NULL) 478 return 0; 479 if (*s == '-') 480 s++; 481 return (!is_number(s)); 482 } 483 484 int 485 str_to_event(const char *str, int last) 486 { 487 HistEvent he; 488 const char *s = str; 489 int relative = 0; 490 int i, retval; 491 492 retval = history(hist, &he, H_FIRST); 493 switch (*s) { 494 case '-': 495 relative = 1; 496 /*FALLTHROUGH*/ 497 case '+': 498 s++; 499 } 500 if (is_number(s)) { 501 i = atoi(s); 502 if (relative) { 503 while (retval != -1 && i--) { 504 retval = history(hist, &he, H_NEXT); 505 } 506 if (retval == -1) 507 retval = history(hist, &he, H_LAST); 508 } else { 509 retval = history(hist, &he, H_NEXT_EVENT, i); 510 if (retval == -1) { 511 /* 512 * the notion of first and last is 513 * backwards to that of the history package 514 */ 515 retval = history(hist, &he, 516 last ? H_FIRST : H_LAST); 517 } 518 } 519 if (retval == -1) 520 error("history number %s not found (internal error)", 521 str); 522 } else { 523 /* 524 * pattern 525 */ 526 retval = history(hist, &he, H_PREV_STR, str); 527 if (retval == -1) 528 error("history pattern not found: %s", str); 529 } 530 return (he.num); 531 } 532 #else 533 int 534 histcmd(int argc, char **argv) 535 { 536 error("not compiled with history support"); 537 /* NOTREACHED */ 538 } 539 int 540 inputrc(int argc, char **argv) 541 { 542 error("not compiled with history support"); 543 /* NOTREACHED */ 544 } 545 #endif 546