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 1.11 2007/01/14 17:29:58 pavalos 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 #ifndef NO_HISTORY 58 #include "myhistedit.h" 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 } else { 128 bad: 129 out2str("sh: can't initialize editing\n"); 130 } 131 INTON; 132 } else if (!editing && el) { 133 INTOFF; 134 el_end(el); 135 el = NULL; 136 INTON; 137 } 138 if (el) { 139 if (Vflag) 140 el_set(el, EL_EDITOR, "vi"); 141 else if (Eflag) 142 el_set(el, EL_EDITOR, "emacs"); 143 el_source(el, NULL); 144 } 145 } else { 146 INTOFF; 147 if (el) { /* no editing if not interactive */ 148 el_end(el); 149 el = NULL; 150 } 151 if (hist) { 152 history_end(hist); 153 hist = NULL; 154 } 155 INTON; 156 } 157 } 158 159 160 void 161 sethistsize(const char *hs) 162 { 163 int histsize; 164 HistEvent he; 165 166 if (hist != NULL) { 167 if (hs == NULL || *hs == '\0' || 168 (histsize = atoi(hs)) < 0) 169 histsize = 100; 170 history(hist, &he, H_SETSIZE, histsize); 171 } 172 } 173 174 int 175 histcmd(int argc, char **argv) 176 { 177 int ch; 178 const char *volatile editor = NULL; 179 HistEvent he; 180 volatile int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 181 int i, retval; 182 const char *firststr = NULL, *laststr = NULL; 183 int first, last, direction; 184 char *pat = NULL, *repl = NULL; 185 static int active = 0; 186 struct jmploc jmploc; 187 struct jmploc *volatile savehandler; 188 char editfile[PATH_MAX]; 189 FILE *efp = NULL; 190 int oldhistnum; 191 192 if (hist == NULL) 193 error("history not active"); 194 195 if (argc == 1) 196 error("missing history argument"); 197 198 optreset = 1; optind = 1; /* initialize getopt */ 199 opterr = 0; 200 while (not_fcnumber(argv[optind]) && 201 (ch = getopt(argc, argv, ":e:lnrs")) != -1) 202 switch ((char)ch) { 203 case 'e': 204 editor = optarg; 205 break; 206 case 'l': 207 lflg = 1; 208 break; 209 case 'n': 210 nflg = 1; 211 break; 212 case 'r': 213 rflg = 1; 214 break; 215 case 's': 216 sflg = 1; 217 break; 218 case ':': 219 error("option -%c expects argument", optopt); 220 case '?': 221 default: 222 error("unknown option: -%c", optopt); 223 } 224 argc -= optind, argv += optind; 225 226 /* 227 * If executing... 228 */ 229 if (lflg == 0 || editor || sflg) { 230 lflg = 0; /* ignore */ 231 editfile[0] = '\0'; 232 /* 233 * Catch interrupts to reset active counter and 234 * cleanup temp files. 235 */ 236 if (setjmp(jmploc.loc)) { 237 active = 0; 238 if (*editfile) 239 unlink(editfile); 240 handler = savehandler; 241 longjmp(handler->loc, 1); 242 } 243 savehandler = handler; 244 handler = &jmploc; 245 if (++active > MAXHISTLOOPS) { 246 active = 0; 247 displayhist = 0; 248 error("called recursively too many times"); 249 } 250 /* 251 * Set editor. 252 */ 253 if (sflg == 0) { 254 if (editor == NULL && 255 (editor = bltinlookup("FCEDIT", 1)) == NULL && 256 (editor = bltinlookup("EDITOR", 1)) == NULL) 257 editor = DEFEDITOR; 258 if (editor[0] == '-' && editor[1] == '\0') { 259 sflg = 1; /* no edit */ 260 editor = NULL; 261 } 262 } 263 } 264 265 /* 266 * If executing, parse [old=new] now 267 */ 268 if (lflg == 0 && argc > 0 && 269 ((repl = strchr(argv[0], '=')) != NULL)) { 270 pat = argv[0]; 271 *repl++ = '\0'; 272 argc--, argv++; 273 } 274 /* 275 * determine [first] and [last] 276 */ 277 switch (argc) { 278 case 0: 279 firststr = lflg ? "-16" : "-1"; 280 laststr = "-1"; 281 break; 282 case 1: 283 firststr = argv[0]; 284 laststr = lflg ? "-1" : argv[0]; 285 break; 286 case 2: 287 firststr = argv[0]; 288 laststr = argv[1]; 289 break; 290 default: 291 error("too many args"); 292 } 293 /* 294 * Turn into event numbers. 295 */ 296 first = str_to_event(firststr, 0); 297 last = str_to_event(laststr, 1); 298 299 if (rflg) { 300 i = last; 301 last = first; 302 first = i; 303 } 304 /* 305 * XXX - this should not depend on the event numbers 306 * always increasing. Add sequence numbers or offset 307 * to the history element in next (diskbased) release. 308 */ 309 direction = first < last ? H_PREV : H_NEXT; 310 311 /* 312 * If editing, grab a temp file. 313 */ 314 if (editor) { 315 int fd; 316 INTOFF; /* easier */ 317 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); 318 if ((fd = mkstemp(editfile)) < 0) 319 error("can't create temporary file %s", editfile); 320 if ((efp = fdopen(fd, "w")) == NULL) { 321 close(fd); 322 error("can't allocate stdio buffer for temp"); 323 } 324 } 325 326 /* 327 * Loop through selected history events. If listing or executing, 328 * do it now. Otherwise, put into temp file and call the editor 329 * after. 330 * 331 * The history interface needs rethinking, as the following 332 * convolutions will demonstrate. 333 */ 334 history(hist, &he, H_FIRST); 335 retval = history(hist, &he, H_NEXT_EVENT, first); 336 for (;retval != -1; retval = history(hist, &he, direction)) { 337 if (lflg) { 338 if (!nflg) 339 out1fmt("%5d ", he.num); 340 out1str(he.str); 341 } else { 342 const char *s = pat ? 343 fc_replace(he.str, pat, repl) : he.str; 344 345 if (sflg) { 346 if (displayhist) { 347 out2str(s); 348 } 349 evalstring(strcpy(stalloc(strlen(s) + 1), s)); 350 if (displayhist && hist) { 351 /* 352 * XXX what about recursive and 353 * relative histnums. 354 */ 355 oldhistnum = he.num; 356 history(hist, &he, H_ENTER, s); 357 /* 358 * XXX H_ENTER moves the internal 359 * cursor, set it back to the current 360 * entry. 361 */ 362 retval = history(hist, &he, 363 H_NEXT_EVENT, oldhistnum); 364 } 365 } else 366 fputs(s, efp); 367 } 368 /* 369 * At end? (if we were to lose last, we'd sure be 370 * messed up). 371 */ 372 if (he.num == last) 373 break; 374 } 375 if (editor) { 376 char *editcmd; 377 378 fclose(efp); 379 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 380 sprintf(editcmd, "%s %s", editor, editfile); 381 evalstring(editcmd); /* XXX - should use no JC command */ 382 INTON; 383 readcmdfile(editfile); /* XXX - should read back - quick tst */ 384 unlink(editfile); 385 } 386 387 if (lflg == 0 && active > 0) 388 --active; 389 if (displayhist) 390 displayhist = 0; 391 return 0; 392 } 393 394 STATIC char * 395 fc_replace(const char *s, char *p, char *r) 396 { 397 char *dest; 398 int plen = strlen(p); 399 400 STARTSTACKSTR(dest); 401 while (*s) { 402 if (*s == *p && strncmp(s, p, plen) == 0) { 403 while (*r) 404 STPUTC(*r++, dest); 405 s += plen; 406 *p = '\0'; /* so no more matches */ 407 } else 408 STPUTC(*s++, dest); 409 } 410 STACKSTRNUL(dest); 411 dest = grabstackstr(dest); 412 413 return (dest); 414 } 415 416 int 417 not_fcnumber(char *s) 418 { 419 if (s == NULL) 420 return (0); 421 if (*s == '-') 422 s++; 423 return (!is_number(s)); 424 } 425 426 int 427 str_to_event(const char *str, int last) 428 { 429 HistEvent he; 430 const char *s = str; 431 int relative = 0; 432 int i, retval; 433 434 retval = history(hist, &he, H_FIRST); 435 switch (*s) { 436 case '-': 437 relative = 1; 438 /*FALLTHROUGH*/ 439 case '+': 440 s++; 441 } 442 if (is_number(s)) { 443 i = atoi(s); 444 if (relative) { 445 while (retval != -1 && i--) { 446 retval = history(hist, &he, H_NEXT); 447 } 448 if (retval == -1) 449 retval = history(hist, &he, H_LAST); 450 } else { 451 retval = history(hist, &he, H_NEXT_EVENT, i); 452 if (retval == -1) { 453 /* 454 * the notion of first and last is 455 * backwards to that of the history package 456 */ 457 retval = history(hist, &he, last ? H_FIRST : H_LAST); 458 } 459 } 460 if (retval == -1) 461 error("history number %s not found (internal error)", 462 str); 463 } else { 464 /* 465 * pattern 466 */ 467 retval = history(hist, &he, H_PREV_STR, str); 468 if (retval == -1) 469 error("history pattern not found: %s", str); 470 } 471 return (he.num); 472 } 473 474 int 475 bindcmd(int argc, char **argv) 476 { 477 478 if (el == NULL) 479 error("line editing is disabled"); 480 return (el_parse(el, argc, (const char **)argv)); 481 } 482 483 #else 484 #include "error.h" 485 486 int 487 histcmd(int argc, char **argv) 488 { 489 490 error("not compiled with history support"); 491 /*NOTREACHED*/ 492 return (0); 493 } 494 495 int 496 bindcmd(int argc, char **argv) 497 { 498 499 error("not compiled with line editing support"); 500 return (0); 501 } 502 #endif 503