1 /* $NetBSD: histedit.c,v 1.48 2016/03/16 22:36:40 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 1.48 2016/03/16 22:36:40 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 "builtins.h" 57 #include "main.h" 58 #include "output.h" 59 #include "mystring.h" 60 #include "myhistedit.h" 61 #include "error.h" 62 #include "alias.h" 63 #ifndef SMALL 64 #include "eval.h" 65 #include "memalloc.h" 66 67 #define MAXHISTLOOPS 4 /* max recursions through fc */ 68 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ 69 70 History *hist; /* history cookie */ 71 EditLine *el; /* editline cookie */ 72 int displayhist; 73 static FILE *el_in, *el_out; 74 unsigned char _el_fn_complete(EditLine *, int); 75 76 STATIC const char *fc_replace(const char *, char *, char *); 77 78 #ifdef DEBUG 79 extern FILE *tracefile; 80 #endif 81 82 /* 83 * Set history and editing status. Called whenever the status may 84 * have changed (figures out what to do). 85 */ 86 void 87 histedit(void) 88 { 89 FILE *el_err; 90 91 #define editing (Eflag || Vflag) 92 93 if (iflag == 1) { 94 if (!hist) { 95 /* 96 * turn history on 97 */ 98 INTOFF; 99 hist = history_init(); 100 INTON; 101 102 if (hist != NULL) 103 sethistsize(histsizeval()); 104 else 105 out2str("sh: can't initialize history\n"); 106 } 107 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ 108 /* 109 * turn editing on 110 */ 111 char *term, *shname; 112 113 INTOFF; 114 if (el_in == NULL) 115 el_in = fdopen(0, "r"); 116 if (el_out == NULL) 117 el_out = fdopen(2, "w"); 118 if (el_in == NULL || el_out == NULL) 119 goto bad; 120 el_err = el_out; 121 #if DEBUG 122 if (tracefile) 123 el_err = tracefile; 124 #endif 125 term = lookupvar("TERM"); 126 if (term) 127 setenv("TERM", term, 1); 128 else 129 unsetenv("TERM"); 130 shname = arg0; 131 if (shname[0] == '-') 132 shname++; 133 el = el_init(shname, el_in, el_out, el_err); 134 if (el != NULL) { 135 if (hist) 136 el_set(el, EL_HIST, history, hist); 137 el_set(el, EL_PROMPT, getprompt); 138 el_set(el, EL_SIGNAL, 1); 139 el_set(el, EL_ALIAS_TEXT, alias_text, NULL); 140 el_set(el, EL_ADDFN, "rl-complete", 141 "ReadLine compatible completion function", 142 _el_fn_complete); 143 } else { 144 bad: 145 out2str("sh: can't initialize editing\n"); 146 } 147 INTON; 148 } else if (!editing && el) { 149 INTOFF; 150 el_end(el); 151 el = NULL; 152 INTON; 153 } 154 if (el) { 155 el_source(el, NULL); 156 if (Vflag) 157 el_set(el, EL_EDITOR, "vi"); 158 else if (Eflag) 159 el_set(el, EL_EDITOR, "emacs"); 160 el_set(el, EL_BIND, "^I", 161 tabcomplete ? "rl-complete" : "ed-insert", NULL); 162 } 163 } else { 164 INTOFF; 165 if (el) { /* no editing if not interactive */ 166 el_end(el); 167 el = NULL; 168 } 169 if (hist) { 170 history_end(hist); 171 hist = NULL; 172 } 173 INTON; 174 } 175 } 176 177 178 void 179 sethistsize(const char *hs) 180 { 181 int histsize; 182 HistEvent he; 183 184 if (hist != NULL) { 185 if (hs == NULL || *hs == '\0' || 186 (histsize = atoi(hs)) < 0) 187 histsize = 100; 188 history(hist, &he, H_SETSIZE, histsize); 189 history(hist, &he, H_SETUNIQUE, 1); 190 } 191 } 192 193 void 194 setterm(const char *term) 195 { 196 if (el != NULL && term != NULL) 197 if (el_set(el, EL_TERMINAL, term) != 0) { 198 outfmt(out2, "sh: Can't set terminal type %s\n", term); 199 outfmt(out2, "sh: Using dumb terminal settings.\n"); 200 } 201 } 202 203 int 204 inputrc(int argc, 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(volatile int argc, char ** volatile argv) 228 { 229 int ch; 230 const char * volatile editor = NULL; 231 HistEvent he; 232 volatile int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 233 int i, retval; 234 const char *firststr, *laststr; 235 int first, last, direction; 236 char * volatile pat = NULL, * volatile 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 * volatile 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 savehandler = handler; 293 if (setjmp(jmploc.loc)) { 294 active = 0; 295 if (*editfile) 296 unlink(editfile); 297 handler = savehandler; 298 longjmp(handler->loc, 1); 299 } 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 size_t cmdlen; 437 438 fclose(efp); 439 cmdlen = strlen(editor) + strlen(editfile) + 2; 440 editcmd = stalloc(cmdlen); 441 snprintf(editcmd, cmdlen, "%s %s", editor, editfile); 442 evalstring(editcmd, 0); /* XXX - should use no JC command */ 443 INTON; 444 readcmdfile(editfile); /* XXX - should read back - quick tst */ 445 unlink(editfile); 446 } 447 448 if (lflg == 0 && active > 0) 449 --active; 450 if (displayhist) 451 displayhist = 0; 452 return 0; 453 } 454 455 STATIC const char * 456 fc_replace(const char *s, char *p, char *r) 457 { 458 char *dest; 459 int plen = strlen(p); 460 461 STARTSTACKSTR(dest); 462 while (*s) { 463 if (*s == *p && strncmp(s, p, plen) == 0) { 464 while (*r) 465 STPUTC(*r++, dest); 466 s += plen; 467 *p = '\0'; /* so no more matches */ 468 } else 469 STPUTC(*s++, dest); 470 } 471 STACKSTRNUL(dest); 472 dest = grabstackstr(dest); 473 474 return (dest); 475 } 476 477 int 478 not_fcnumber(char *s) 479 { 480 if (s == NULL) 481 return 0; 482 if (*s == '-') 483 s++; 484 return (!is_number(s)); 485 } 486 487 int 488 str_to_event(const char *str, int last) 489 { 490 HistEvent he; 491 const char *s = str; 492 int relative = 0; 493 int i, retval; 494 495 retval = history(hist, &he, H_FIRST); 496 switch (*s) { 497 case '-': 498 relative = 1; 499 /*FALLTHROUGH*/ 500 case '+': 501 s++; 502 } 503 if (is_number(s)) { 504 i = atoi(s); 505 if (relative) { 506 while (retval != -1 && i--) { 507 retval = history(hist, &he, H_NEXT); 508 } 509 if (retval == -1) 510 retval = history(hist, &he, H_LAST); 511 } else { 512 retval = history(hist, &he, H_NEXT_EVENT, i); 513 if (retval == -1) { 514 /* 515 * the notion of first and last is 516 * backwards to that of the history package 517 */ 518 retval = history(hist, &he, 519 last ? H_FIRST : H_LAST); 520 } 521 } 522 if (retval == -1) 523 error("history number %s not found (internal error)", 524 str); 525 } else { 526 /* 527 * pattern 528 */ 529 retval = history(hist, &he, H_PREV_STR, str); 530 if (retval == -1) 531 error("history pattern not found: %s", str); 532 } 533 return (he.num); 534 } 535 #else 536 int 537 histcmd(int argc, char **argv) 538 { 539 error("not compiled with history support"); 540 /* NOTREACHED */ 541 } 542 int 543 inputrc(int argc, char **argv) 544 { 545 error("not compiled with history support"); 546 /* NOTREACHED */ 547 } 548 #endif 549