1 /*- 2 * Copyright (c) 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)histedit.c 8.2 (Berkeley) 5/4/95 37 * $FreeBSD: src/bin/sh/histedit.c,v 1.29 2006/08/04 07:56:31 yar Exp $ 38 * $DragonFly: src/bin/sh/histedit.c,v 1.12 2008/02/13 15:13:37 matthias Exp $ 39 */ 40 41 #include <sys/param.h> 42 #include <limits.h> 43 #include <paths.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <unistd.h> 47 /* 48 * Editline and history functions (and glue). 49 */ 50 #include "shell.h" 51 #include "parser.h" 52 #include "var.h" 53 #include "options.h" 54 #include "main.h" 55 #include "output.h" 56 #include "mystring.h" 57 #include "myhistedit.h" 58 #ifndef NO_HISTORY 59 #include "error.h" 60 #include "eval.h" 61 #include "memalloc.h" 62 63 #define MAXHISTLOOPS 4 /* max recursions through fc */ 64 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ 65 66 History *hist; /* history cookie */ 67 EditLine *el; /* editline cookie */ 68 int displayhist; 69 static FILE *el_in, *el_out, *el_err; 70 71 STATIC char *fc_replace(const char *, char *, char *); 72 73 /* 74 * Set history and editing status. Called whenever the status may 75 * have changed (figures out what to do). 76 */ 77 void 78 histedit(void) 79 { 80 81 #define editing (Eflag || Vflag) 82 83 if (iflag) { 84 if (!hist) { 85 /* 86 * turn history on 87 */ 88 INTOFF; 89 hist = history_init(); 90 INTON; 91 92 if (hist != NULL) 93 sethistsize(histsizeval()); 94 else 95 out2str("sh: can't initialize history\n"); 96 } 97 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ 98 /* 99 * turn editing on 100 */ 101 char *term, *shname; 102 103 INTOFF; 104 if (el_in == NULL) 105 el_in = fdopen(0, "r"); 106 if (el_err == NULL) 107 el_err = fdopen(1, "w"); 108 if (el_out == NULL) 109 el_out = fdopen(2, "w"); 110 if (el_in == NULL || el_err == NULL || el_out == NULL) 111 goto bad; 112 term = lookupvar("TERM"); 113 if (term) { 114 if (setenv("TERM", term, 1) == -1) 115 error("setenv: cannot set TERM=1"); 116 } 117 else 118 unsetenv("TERM"); 119 shname = arg0; 120 if (shname[0] == '-') 121 shname++; 122 el = el_init(arg0, el_in, el_out, el_err); 123 if (el != NULL) { 124 if (hist) 125 el_set(el, EL_HIST, history, hist); 126 el_set(el, EL_PROMPT, getprompt); 127 el_set(el, EL_ADDFN, "rl-complete", 128 "ReadLine compatible completion function", 129 _el_fn_complete); 130 } else { 131 bad: 132 out2str("sh: can't initialize editing\n"); 133 } 134 INTON; 135 } else if (!editing && el) { 136 INTOFF; 137 el_end(el); 138 el = NULL; 139 INTON; 140 } 141 if (el) { 142 if (Vflag) 143 el_set(el, EL_EDITOR, "vi"); 144 else if (Eflag) 145 el_set(el, EL_EDITOR, "emacs"); 146 el_set(el, EL_BIND, "^I", 147 tabcomplete ? "rl-complete" : "ed-insert", NULL); 148 el_source(el, NULL); 149 } 150 } else { 151 INTOFF; 152 if (el) { /* no editing if not interactive */ 153 el_end(el); 154 el = NULL; 155 } 156 if (hist) { 157 history_end(hist); 158 hist = NULL; 159 } 160 INTON; 161 } 162 } 163 164 165 void 166 sethistsize(const char *hs) 167 { 168 int histsize; 169 HistEvent he; 170 171 if (hist != NULL) { 172 if (hs == NULL || *hs == '\0' || 173 (histsize = atoi(hs)) < 0) 174 histsize = 100; 175 history(hist, &he, H_SETSIZE, histsize); 176 history(hist, &he, H_SETUNIQUE, 1); 177 } 178 } 179 180 int 181 histcmd(int argc, char **argv) 182 { 183 int ch; 184 const char *volatile editor = NULL; 185 HistEvent he; 186 volatile int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 187 int i, retval; 188 const char *firststr = NULL, *laststr = NULL; 189 int first, last, direction; 190 char *pat = NULL, *repl = NULL; 191 static int active = 0; 192 struct jmploc jmploc; 193 struct jmploc *volatile savehandler; 194 char editfile[PATH_MAX]; 195 FILE *efp = NULL; 196 int oldhistnum; 197 198 if (hist == NULL) 199 error("history not active"); 200 201 if (argc == 1) 202 error("missing history argument"); 203 204 optreset = 1; optind = 1; /* initialize getopt */ 205 opterr = 0; 206 while (not_fcnumber(argv[optind]) && 207 (ch = getopt(argc, argv, ":e:lnrs")) != -1) 208 switch ((char)ch) { 209 case 'e': 210 editor = optarg; 211 break; 212 case 'l': 213 lflg = 1; 214 break; 215 case 'n': 216 nflg = 1; 217 break; 218 case 'r': 219 rflg = 1; 220 break; 221 case 's': 222 sflg = 1; 223 break; 224 case ':': 225 error("option -%c expects argument", optopt); 226 case '?': 227 default: 228 error("unknown option: -%c", optopt); 229 } 230 argc -= optind, argv += optind; 231 232 /* 233 * If executing... 234 */ 235 if (lflg == 0 || editor || sflg) { 236 lflg = 0; /* ignore */ 237 editfile[0] = '\0'; 238 /* 239 * Catch interrupts to reset active counter and 240 * cleanup temp files. 241 */ 242 if (setjmp(jmploc.loc)) { 243 active = 0; 244 if (*editfile) 245 unlink(editfile); 246 handler = savehandler; 247 longjmp(handler->loc, 1); 248 } 249 savehandler = handler; 250 handler = &jmploc; 251 if (++active > MAXHISTLOOPS) { 252 active = 0; 253 displayhist = 0; 254 error("called recursively too many times"); 255 } 256 /* 257 * Set editor. 258 */ 259 if (sflg == 0) { 260 if (editor == NULL && 261 (editor = bltinlookup("FCEDIT", 1)) == NULL && 262 (editor = bltinlookup("EDITOR", 1)) == NULL) 263 editor = DEFEDITOR; 264 if (editor[0] == '-' && editor[1] == '\0') { 265 sflg = 1; /* no edit */ 266 editor = NULL; 267 } 268 } 269 } 270 271 /* 272 * If executing, parse [old=new] now 273 */ 274 if (lflg == 0 && argc > 0 && 275 ((repl = strchr(argv[0], '=')) != NULL)) { 276 pat = argv[0]; 277 *repl++ = '\0'; 278 argc--, argv++; 279 } 280 /* 281 * determine [first] and [last] 282 */ 283 switch (argc) { 284 case 0: 285 firststr = lflg ? "-16" : "-1"; 286 laststr = "-1"; 287 break; 288 case 1: 289 firststr = argv[0]; 290 laststr = lflg ? "-1" : argv[0]; 291 break; 292 case 2: 293 firststr = argv[0]; 294 laststr = argv[1]; 295 break; 296 default: 297 error("too many args"); 298 } 299 /* 300 * Turn into event numbers. 301 */ 302 first = str_to_event(firststr, 0); 303 last = str_to_event(laststr, 1); 304 305 if (rflg) { 306 i = last; 307 last = first; 308 first = i; 309 } 310 /* 311 * XXX - this should not depend on the event numbers 312 * always increasing. Add sequence numbers or offset 313 * to the history element in next (diskbased) release. 314 */ 315 direction = first < last ? H_PREV : H_NEXT; 316 317 /* 318 * If editing, grab a temp file. 319 */ 320 if (editor) { 321 int fd; 322 INTOFF; /* easier */ 323 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); 324 if ((fd = mkstemp(editfile)) < 0) 325 error("can't create temporary file %s", editfile); 326 if ((efp = fdopen(fd, "w")) == NULL) { 327 close(fd); 328 error("can't allocate stdio buffer for temp"); 329 } 330 } 331 332 /* 333 * Loop through selected history events. If listing or executing, 334 * do it now. Otherwise, put into temp file and call the editor 335 * after. 336 * 337 * The history interface needs rethinking, as the following 338 * convolutions will demonstrate. 339 */ 340 history(hist, &he, H_FIRST); 341 retval = history(hist, &he, H_NEXT_EVENT, first); 342 for (;retval != -1; retval = history(hist, &he, direction)) { 343 if (lflg) { 344 if (!nflg) 345 out1fmt("%5d ", he.num); 346 out1str(he.str); 347 } else { 348 const char *s = pat ? 349 fc_replace(he.str, pat, repl) : he.str; 350 351 if (sflg) { 352 if (displayhist) { 353 out2str(s); 354 } 355 evalstring(strcpy(stalloc(strlen(s) + 1), s)); 356 if (displayhist && hist) { 357 /* 358 * XXX what about recursive and 359 * relative histnums. 360 */ 361 oldhistnum = he.num; 362 history(hist, &he, H_ENTER, s); 363 /* 364 * XXX H_ENTER moves the internal 365 * cursor, set it back to the current 366 * entry. 367 */ 368 retval = history(hist, &he, 369 H_NEXT_EVENT, oldhistnum); 370 } 371 } else 372 fputs(s, efp); 373 } 374 /* 375 * At end? (if we were to lose last, we'd sure be 376 * messed up). 377 */ 378 if (he.num == last) 379 break; 380 } 381 if (editor) { 382 char *editcmd; 383 384 fclose(efp); 385 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 386 sprintf(editcmd, "%s %s", editor, editfile); 387 evalstring(editcmd); /* XXX - should use no JC command */ 388 INTON; 389 readcmdfile(editfile); /* XXX - should read back - quick tst */ 390 unlink(editfile); 391 } 392 393 if (lflg == 0 && active > 0) 394 --active; 395 if (displayhist) 396 displayhist = 0; 397 return 0; 398 } 399 400 STATIC char * 401 fc_replace(const char *s, char *p, char *r) 402 { 403 char *dest; 404 int plen = strlen(p); 405 406 STARTSTACKSTR(dest); 407 while (*s) { 408 if (*s == *p && strncmp(s, p, plen) == 0) { 409 while (*r) 410 STPUTC(*r++, dest); 411 s += plen; 412 *p = '\0'; /* so no more matches */ 413 } else 414 STPUTC(*s++, dest); 415 } 416 STACKSTRNUL(dest); 417 dest = grabstackstr(dest); 418 419 return (dest); 420 } 421 422 int 423 not_fcnumber(char *s) 424 { 425 if (s == NULL) 426 return (0); 427 if (*s == '-') 428 s++; 429 return (!is_number(s)); 430 } 431 432 int 433 str_to_event(const char *str, int last) 434 { 435 HistEvent he; 436 const char *s = str; 437 int relative = 0; 438 int i, retval; 439 440 retval = history(hist, &he, H_FIRST); 441 switch (*s) { 442 case '-': 443 relative = 1; 444 /*FALLTHROUGH*/ 445 case '+': 446 s++; 447 } 448 if (is_number(s)) { 449 i = atoi(s); 450 if (relative) { 451 while (retval != -1 && i--) { 452 retval = history(hist, &he, H_NEXT); 453 } 454 if (retval == -1) 455 retval = history(hist, &he, H_LAST); 456 } else { 457 retval = history(hist, &he, H_NEXT_EVENT, i); 458 if (retval == -1) { 459 /* 460 * the notion of first and last is 461 * backwards to that of the history package 462 */ 463 retval = history(hist, &he, last ? H_FIRST : H_LAST); 464 } 465 } 466 if (retval == -1) 467 error("history number %s not found (internal error)", 468 str); 469 } else { 470 /* 471 * pattern 472 */ 473 retval = history(hist, &he, H_PREV_STR, str); 474 if (retval == -1) 475 error("history pattern not found: %s", str); 476 } 477 return (he.num); 478 } 479 480 int 481 bindcmd(int argc, char **argv) 482 { 483 484 if (el == NULL) 485 error("line editing is disabled"); 486 return (el_parse(el, argc, (const char **)argv)); 487 } 488 489 #else 490 #include "error.h" 491 492 int 493 histcmd(int argc __unused, char **argv __unused) 494 { 495 496 error("not compiled with history support"); 497 /*NOTREACHED*/ 498 return (0); 499 } 500 501 int 502 bindcmd(int argc __unused, char **argv __unused) 503 { 504 505 error("not compiled with line editing support"); 506 return (0); 507 } 508 #endif 509