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 1.4 2004/03/19 18:39:41 cpressey 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 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 INTOFF; 102 if (el_in == NULL) 103 el_in = fdopen(0, "r"); 104 if (el_out == NULL) 105 el_out = fdopen(2, "w"); 106 if (el_in == NULL || el_out == NULL) 107 goto bad; 108 el = el_init(arg0, el_in, el_out); 109 if (el != NULL) { 110 if (hist) 111 el_set(el, EL_HIST, history, hist); 112 el_set(el, EL_PROMPT, getprompt); 113 } else { 114 bad: 115 out2str("sh: can't initialize editing\n"); 116 } 117 INTON; 118 } else if (!editing && el) { 119 INTOFF; 120 el_end(el); 121 el = NULL; 122 INTON; 123 } 124 if (el) { 125 if (Vflag) 126 el_set(el, EL_EDITOR, "vi"); 127 else if (Eflag) 128 el_set(el, EL_EDITOR, "emacs"); 129 el_source(el, NULL); 130 } 131 } else { 132 INTOFF; 133 if (el) { /* no editing if not interactive */ 134 el_end(el); 135 el = NULL; 136 } 137 if (hist) { 138 history_end(hist); 139 hist = NULL; 140 } 141 INTON; 142 } 143 } 144 145 146 void 147 sethistsize(hs) 148 const char *hs; 149 { 150 int histsize; 151 152 if (hist != NULL) { 153 if (hs == NULL || *hs == '\0' || 154 (histsize = atoi(hs)) < 0) 155 histsize = 100; 156 history(hist, H_EVENT, histsize); 157 } 158 } 159 160 /* 161 * This command is provided since POSIX decided to standardize 162 * the Korn shell fc command. Oh well... 163 */ 164 int 165 histcmd(int argc, char **argv) 166 { 167 int ch; 168 const char *editor = NULL; 169 const HistEvent *he; 170 int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 171 int i; 172 const char *firststr, *laststr; 173 int first, last, direction; 174 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 175 static int active = 0; 176 struct jmploc jmploc; 177 struct jmploc *volatile savehandler; 178 char editfile[PATH_MAX]; 179 FILE *efp; 180 #ifdef __GNUC__ 181 /* Avoid longjmp clobbering */ 182 (void) &editor; 183 (void) &lflg; 184 (void) &nflg; 185 (void) &rflg; 186 (void) &sflg; 187 (void) &firststr; 188 (void) &laststr; 189 (void) &pat; 190 (void) &repl; 191 (void) &efp; 192 (void) &argc; 193 (void) &argv; 194 #endif 195 196 if (hist == NULL) 197 error("history not active"); 198 199 if (argc == 1) 200 error("missing history argument"); 201 202 optreset = 1; optind = 1; /* initialize getopt */ 203 opterr = 0; 204 while (not_fcnumber(argv[optind]) && 205 (ch = getopt(argc, argv, ":e:lnrs")) != -1) 206 switch ((char)ch) { 207 case 'e': 208 editor = optarg; 209 break; 210 case 'l': 211 lflg = 1; 212 break; 213 case 'n': 214 nflg = 1; 215 break; 216 case 'r': 217 rflg = 1; 218 break; 219 case 's': 220 sflg = 1; 221 break; 222 case ':': 223 error("option -%c expects argument", optopt); 224 case '?': 225 default: 226 error("unknown option: -%c", optopt); 227 } 228 argc -= optind, argv += optind; 229 230 /* 231 * If executing... 232 */ 233 if (lflg == 0 || editor || sflg) { 234 lflg = 0; /* ignore */ 235 editfile[0] = '\0'; 236 /* 237 * Catch interrupts to reset active counter and 238 * cleanup temp files. 239 */ 240 if (setjmp(jmploc.loc)) { 241 active = 0; 242 if (*editfile) 243 unlink(editfile); 244 handler = savehandler; 245 longjmp(handler->loc, 1); 246 } 247 savehandler = handler; 248 handler = &jmploc; 249 if (++active > MAXHISTLOOPS) { 250 active = 0; 251 displayhist = 0; 252 error("called recursively too many times"); 253 } 254 /* 255 * Set editor. 256 */ 257 if (sflg == 0) { 258 if (editor == NULL && 259 (editor = bltinlookup("FCEDIT", 1)) == NULL && 260 (editor = bltinlookup("EDITOR", 1)) == NULL) 261 editor = DEFEDITOR; 262 if (editor[0] == '-' && editor[1] == '\0') { 263 sflg = 1; /* no edit */ 264 editor = NULL; 265 } 266 } 267 } 268 269 /* 270 * If executing, parse [old=new] now 271 */ 272 if (lflg == 0 && argc > 0 && 273 ((repl = strchr(argv[0], '=')) != NULL)) { 274 pat = argv[0]; 275 *repl++ = '\0'; 276 argc--, argv++; 277 } 278 /* 279 * determine [first] and [last] 280 */ 281 switch (argc) { 282 case 0: 283 firststr = lflg ? "-16" : "-1"; 284 laststr = "-1"; 285 break; 286 case 1: 287 firststr = argv[0]; 288 laststr = lflg ? "-1" : argv[0]; 289 break; 290 case 2: 291 firststr = argv[0]; 292 laststr = argv[1]; 293 break; 294 default: 295 error("too many args"); 296 } 297 /* 298 * Turn into event numbers. 299 */ 300 first = str_to_event(firststr, 0); 301 last = str_to_event(laststr, 1); 302 303 if (rflg) { 304 i = last; 305 last = first; 306 first = i; 307 } 308 /* 309 * XXX - this should not depend on the event numbers 310 * always increasing. Add sequence numbers or offset 311 * to the history element in next (diskbased) release. 312 */ 313 direction = first < last ? H_PREV : H_NEXT; 314 315 /* 316 * If editing, grab a temp file. 317 */ 318 if (editor) { 319 int fd; 320 INTOFF; /* easier */ 321 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); 322 if ((fd = mkstemp(editfile)) < 0) 323 error("can't create temporary file %s", editfile); 324 if ((efp = fdopen(fd, "w")) == NULL) { 325 close(fd); 326 error("can't allocate stdio buffer for temp"); 327 } 328 } 329 330 /* 331 * Loop through selected history events. If listing or executing, 332 * do it now. Otherwise, put into temp file and call the editor 333 * after. 334 * 335 * The history interface needs rethinking, as the following 336 * convolutions will demonstrate. 337 */ 338 history(hist, H_FIRST); 339 he = history(hist, H_NEXT_EVENT, first); 340 for (;he != NULL; he = history(hist, direction)) { 341 if (lflg) { 342 if (!nflg) 343 out1fmt("%5d ", he->num); 344 out1str(he->str); 345 } else { 346 char *s = pat ? 347 fc_replace(he->str, pat, repl) : (char *)he->str; 348 349 if (sflg) { 350 if (displayhist) { 351 out2str(s); 352 } 353 evalstring(s); 354 if (displayhist && hist) { 355 /* 356 * XXX what about recursive and 357 * relative histnums. 358 */ 359 history(hist, H_ENTER, s); 360 } 361 } else 362 fputs(s, efp); 363 } 364 /* 365 * At end? (if we were to loose last, we'd sure be 366 * messed up). 367 */ 368 if (he->num == last) 369 break; 370 } 371 if (editor) { 372 char *editcmd; 373 374 fclose(efp); 375 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 376 sprintf(editcmd, "%s %s", editor, editfile); 377 evalstring(editcmd); /* XXX - should use no JC command */ 378 INTON; 379 readcmdfile(editfile); /* XXX - should read back - quick tst */ 380 unlink(editfile); 381 } 382 383 if (lflg == 0 && active > 0) 384 --active; 385 if (displayhist) 386 displayhist = 0; 387 return 0; 388 } 389 390 STATIC char * 391 fc_replace(const char *s, char *p, char *r) 392 { 393 char *dest; 394 int plen = strlen(p); 395 396 STARTSTACKSTR(dest); 397 while (*s) { 398 if (*s == *p && strncmp(s, p, plen) == 0) { 399 while (*r) 400 STPUTC(*r++, dest); 401 s += plen; 402 *p = '\0'; /* so no more matches */ 403 } else 404 STPUTC(*s++, dest); 405 } 406 STACKSTRNUL(dest); 407 dest = grabstackstr(dest); 408 409 return (dest); 410 } 411 412 int 413 not_fcnumber(char *s) 414 { 415 if (s == NULL) 416 return (0); 417 if (*s == '-') 418 s++; 419 return (!is_number(s)); 420 } 421 422 int 423 str_to_event(const char *str, int last) 424 { 425 const HistEvent *he; 426 const char *s = str; 427 int relative = 0; 428 int i; 429 430 he = history(hist, H_FIRST); 431 switch (*s) { 432 case '-': 433 relative = 1; 434 /*FALLTHROUGH*/ 435 case '+': 436 s++; 437 } 438 if (is_number(s)) { 439 i = atoi(s); 440 if (relative) { 441 while (he != NULL && i--) { 442 he = history(hist, H_NEXT); 443 } 444 if (he == NULL) 445 he = history(hist, H_LAST); 446 } else { 447 he = history(hist, H_NEXT_EVENT, i); 448 if (he == NULL) { 449 /* 450 * the notion of first and last is 451 * backwards to that of the history package 452 */ 453 he = history(hist, last ? H_FIRST : H_LAST); 454 } 455 } 456 if (he == NULL) 457 error("history number %s not found (internal error)", 458 str); 459 } else { 460 /* 461 * pattern 462 */ 463 he = history(hist, H_PREV_STR, str); 464 if (he == NULL) 465 error("history pattern not found: %s", str); 466 } 467 return (he->num); 468 } 469 470 int 471 bindcmd(int argc, char **argv) 472 { 473 474 if (el == NULL) 475 error("line editing is disabled"); 476 return (el_parse(el, argc, argv)); 477 } 478 479 #else 480 #include "error.h" 481 482 int 483 histcmd(int argc, char **argv) 484 { 485 486 error("not compiled with history support"); 487 /*NOTREACHED*/ 488 return (0); 489 } 490 491 int 492 bindcmd(int argc, char **argv) 493 { 494 495 error("not compiled with line editing support"); 496 return (0); 497 } 498 #endif 499