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 1.13.2.4 2002/08/27 01:36:28 tjr Exp $ 38 * $DragonFly: src/bin/sh/histedit.c,v 1.6 2005/11/13 11:58:30 corecode 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; 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 FILE *el_err; 81 82 #define editing (Eflag || Vflag) 83 84 if (iflag) { 85 if (!hist) { 86 /* 87 * turn history on 88 */ 89 INTOFF; 90 hist = history_init(); 91 INTON; 92 93 if (hist != NULL) 94 sethistsize(histsizeval()); 95 else 96 out2str("sh: can't initialize history\n"); 97 } 98 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ 99 /* 100 * turn editing on 101 */ 102 char *term, *shname; 103 104 INTOFF; 105 if (el_in == NULL) 106 el_in = fdopen(0, "r"); 107 if (el_out == NULL) 108 el_out = fdopen(2, "w"); 109 if (el_in == NULL || el_out == NULL) 110 goto bad; 111 el_err = el_out; 112 term = lookupvar("TERM"); 113 if (term) 114 setenv("TERM", term, 1); 115 else 116 unsetenv("TERM"); 117 shname = arg0; 118 if (shname[0] == '-') 119 shname++; 120 el = el_init(arg0, el_in, el_out, el_err); 121 if (el != NULL) { 122 if (hist) 123 el_set(el, EL_HIST, history, hist); 124 el_set(el, EL_PROMPT, getprompt); 125 } else { 126 bad: 127 out2str("sh: can't initialize editing\n"); 128 } 129 INTON; 130 } else if (!editing && el) { 131 INTOFF; 132 el_end(el); 133 el = NULL; 134 INTON; 135 } 136 if (el) { 137 if (Vflag) 138 el_set(el, EL_EDITOR, "vi"); 139 else if (Eflag) 140 el_set(el, EL_EDITOR, "emacs"); 141 el_source(el, NULL); 142 } 143 } else { 144 INTOFF; 145 if (el) { /* no editing if not interactive */ 146 el_end(el); 147 el = NULL; 148 } 149 if (hist) { 150 history_end(hist); 151 hist = NULL; 152 } 153 INTON; 154 } 155 } 156 157 158 void 159 sethistsize(const char *hs) 160 { 161 int histsize; 162 HistEvent he; 163 164 if (hist != NULL) { 165 if (hs == NULL || *hs == '\0' || 166 (histsize = atoi(hs)) < 0) 167 histsize = 100; 168 history(hist, &he, H_SETSIZE, histsize); 169 } 170 } 171 172 /* 173 * This command is provided since POSIX decided to standardize 174 * the Korn shell fc command. Oh well... 175 */ 176 int 177 histcmd(int argc, char **argv) 178 { 179 int ch; 180 const char *editor = NULL; 181 HistEvent he; 182 int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 183 int i, retval; 184 const char *firststr, *laststr; 185 int first, last, direction; 186 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 187 static int active = 0; 188 struct jmploc jmploc; 189 struct jmploc *volatile savehandler; 190 char editfile[PATH_MAX]; 191 FILE *efp; 192 #ifdef __GNUC__ 193 /* Avoid longjmp clobbering */ 194 (void) &editor; 195 (void) &lflg; 196 (void) &nflg; 197 (void) &rflg; 198 (void) &sflg; 199 (void) &firststr; 200 (void) &laststr; 201 (void) &pat; 202 (void) &repl; 203 (void) &efp; 204 (void) &argc; 205 (void) &argv; 206 #endif 207 208 if (hist == NULL) 209 error("history not active"); 210 211 if (argc == 1) 212 error("missing history argument"); 213 214 optreset = 1; optind = 1; /* initialize getopt */ 215 opterr = 0; 216 while (not_fcnumber(argv[optind]) && 217 (ch = getopt(argc, argv, ":e:lnrs")) != -1) 218 switch ((char)ch) { 219 case 'e': 220 editor = optarg; 221 break; 222 case 'l': 223 lflg = 1; 224 break; 225 case 'n': 226 nflg = 1; 227 break; 228 case 'r': 229 rflg = 1; 230 break; 231 case 's': 232 sflg = 1; 233 break; 234 case ':': 235 error("option -%c expects argument", optopt); 236 case '?': 237 default: 238 error("unknown option: -%c", optopt); 239 } 240 argc -= optind, argv += optind; 241 242 /* 243 * If executing... 244 */ 245 if (lflg == 0 || editor || sflg) { 246 lflg = 0; /* ignore */ 247 editfile[0] = '\0'; 248 /* 249 * Catch interrupts to reset active counter and 250 * cleanup temp files. 251 */ 252 if (setjmp(jmploc.loc)) { 253 active = 0; 254 if (*editfile) 255 unlink(editfile); 256 handler = savehandler; 257 longjmp(handler->loc, 1); 258 } 259 savehandler = handler; 260 handler = &jmploc; 261 if (++active > MAXHISTLOOPS) { 262 active = 0; 263 displayhist = 0; 264 error("called recursively too many times"); 265 } 266 /* 267 * Set editor. 268 */ 269 if (sflg == 0) { 270 if (editor == NULL && 271 (editor = bltinlookup("FCEDIT", 1)) == NULL && 272 (editor = bltinlookup("EDITOR", 1)) == NULL) 273 editor = DEFEDITOR; 274 if (editor[0] == '-' && editor[1] == '\0') { 275 sflg = 1; /* no edit */ 276 editor = NULL; 277 } 278 } 279 } 280 281 /* 282 * If executing, parse [old=new] now 283 */ 284 if (lflg == 0 && argc > 0 && 285 ((repl = strchr(argv[0], '=')) != NULL)) { 286 pat = argv[0]; 287 *repl++ = '\0'; 288 argc--, argv++; 289 } 290 /* 291 * determine [first] and [last] 292 */ 293 switch (argc) { 294 case 0: 295 firststr = lflg ? "-16" : "-1"; 296 laststr = "-1"; 297 break; 298 case 1: 299 firststr = argv[0]; 300 laststr = lflg ? "-1" : argv[0]; 301 break; 302 case 2: 303 firststr = argv[0]; 304 laststr = argv[1]; 305 break; 306 default: 307 error("too many args"); 308 } 309 /* 310 * Turn into event numbers. 311 */ 312 first = str_to_event(firststr, 0); 313 last = str_to_event(laststr, 1); 314 315 if (rflg) { 316 i = last; 317 last = first; 318 first = i; 319 } 320 /* 321 * XXX - this should not depend on the event numbers 322 * always increasing. Add sequence numbers or offset 323 * to the history element in next (diskbased) release. 324 */ 325 direction = first < last ? H_PREV : H_NEXT; 326 327 /* 328 * If editing, grab a temp file. 329 */ 330 if (editor) { 331 int fd; 332 INTOFF; /* easier */ 333 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); 334 if ((fd = mkstemp(editfile)) < 0) 335 error("can't create temporary file %s", editfile); 336 if ((efp = fdopen(fd, "w")) == NULL) { 337 close(fd); 338 error("can't allocate stdio buffer for temp"); 339 } 340 } 341 342 /* 343 * Loop through selected history events. If listing or executing, 344 * do it now. Otherwise, put into temp file and call the editor 345 * after. 346 * 347 * The history interface needs rethinking, as the following 348 * convolutions will demonstrate. 349 */ 350 history(hist, &he, H_FIRST); 351 retval = history(hist, &he, H_NEXT_EVENT, first); 352 for (;retval != -1; retval = history(hist, &he, direction)) { 353 if (lflg) { 354 if (!nflg) 355 out1fmt("%5d ", he.num); 356 out1str(he.str); 357 } else { 358 char *s = pat ? 359 fc_replace(he.str, pat, repl) : (char *)he.str; 360 361 if (sflg) { 362 if (displayhist) { 363 out2str(s); 364 } 365 evalstring(s); 366 if (displayhist && hist) { 367 /* 368 * XXX what about recursive and 369 * relative histnums. 370 */ 371 history(hist, &he, H_ENTER, s); 372 } 373 } else 374 fputs(s, efp); 375 } 376 /* 377 * At end? (if we were to loose last, we'd sure be 378 * messed up). 379 */ 380 if (he.num == last) 381 break; 382 } 383 if (editor) { 384 char *editcmd; 385 386 fclose(efp); 387 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 388 sprintf(editcmd, "%s %s", editor, editfile); 389 evalstring(editcmd); /* XXX - should use no JC command */ 390 INTON; 391 readcmdfile(editfile); /* XXX - should read back - quick tst */ 392 unlink(editfile); 393 } 394 395 if (lflg == 0 && active > 0) 396 --active; 397 if (displayhist) 398 displayhist = 0; 399 return 0; 400 } 401 402 STATIC char * 403 fc_replace(const char *s, char *p, char *r) 404 { 405 char *dest; 406 int plen = strlen(p); 407 408 STARTSTACKSTR(dest); 409 while (*s) { 410 if (*s == *p && strncmp(s, p, plen) == 0) { 411 while (*r) 412 STPUTC(*r++, dest); 413 s += plen; 414 *p = '\0'; /* so no more matches */ 415 } else 416 STPUTC(*s++, dest); 417 } 418 STACKSTRNUL(dest); 419 dest = grabstackstr(dest); 420 421 return (dest); 422 } 423 424 int 425 not_fcnumber(char *s) 426 { 427 if (s == NULL) 428 return (0); 429 if (*s == '-') 430 s++; 431 return (!is_number(s)); 432 } 433 434 int 435 str_to_event(const char *str, int last) 436 { 437 HistEvent he; 438 const char *s = str; 439 int relative = 0; 440 int i, retval; 441 442 history(hist, &he, H_FIRST); 443 switch (*s) { 444 case '-': 445 relative = 1; 446 /*FALLTHROUGH*/ 447 case '+': 448 s++; 449 } 450 if (is_number(s)) { 451 i = atoi(s); 452 if (relative) { 453 while (retval != -1 && i--) { 454 retval = history(hist, &he, H_NEXT); 455 } 456 if (retval == -1) 457 retval = history(hist, &he, H_LAST); 458 } else { 459 retval = history(hist, &he, H_NEXT_EVENT, i); 460 if (retval == -1) { 461 /* 462 * the notion of first and last is 463 * backwards to that of the history package 464 */ 465 retval = history(hist, &he, last ? H_FIRST : H_LAST); 466 } 467 } 468 if (retval == -1) 469 error("history number %s not found (internal error)", 470 str); 471 } else { 472 /* 473 * pattern 474 */ 475 retval = history(hist, &he, H_PREV_STR, str); 476 if (retval == -1) 477 error("history pattern not found: %s", str); 478 } 479 return (he.num); 480 } 481 482 int 483 bindcmd(int argc, char **argv) 484 { 485 486 if (el == NULL) 487 error("line editing is disabled"); 488 return (el_parse(el, argc, (const char **)argv)); 489 } 490 491 #else 492 #include "error.h" 493 494 int 495 histcmd(int argc, char **argv) 496 { 497 498 error("not compiled with history support"); 499 /*NOTREACHED*/ 500 return (0); 501 } 502 503 int 504 bindcmd(int argc, char **argv) 505 { 506 507 error("not compiled with line editing support"); 508 return (0); 509 } 510 #endif 511