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 #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 history(hist, &he, H_SETUNIQUE, 1); 172 } 173 } 174 175 int 176 histcmd(int argc, char **argv) 177 { 178 int ch; 179 const char *volatile editor = NULL; 180 HistEvent he; 181 volatile int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 182 int i, retval; 183 const char *firststr = NULL, *laststr = NULL; 184 int first, last, direction; 185 char *pat = NULL, *repl = NULL; 186 static int active = 0; 187 struct jmploc jmploc; 188 struct jmploc *volatile savehandler; 189 char editfile[PATH_MAX]; 190 FILE *efp = NULL; 191 int oldhistnum; 192 193 if (hist == NULL) 194 error("history not active"); 195 196 if (argc == 1) 197 error("missing history argument"); 198 199 optreset = 1; optind = 1; /* initialize getopt */ 200 opterr = 0; 201 while (not_fcnumber(argv[optind]) && 202 (ch = getopt(argc, argv, ":e:lnrs")) != -1) 203 switch ((char)ch) { 204 case 'e': 205 editor = optarg; 206 break; 207 case 'l': 208 lflg = 1; 209 break; 210 case 'n': 211 nflg = 1; 212 break; 213 case 'r': 214 rflg = 1; 215 break; 216 case 's': 217 sflg = 1; 218 break; 219 case ':': 220 error("option -%c expects argument", optopt); 221 case '?': 222 default: 223 error("unknown option: -%c", optopt); 224 } 225 argc -= optind, argv += optind; 226 227 /* 228 * If executing... 229 */ 230 if (lflg == 0 || editor || sflg) { 231 lflg = 0; /* ignore */ 232 editfile[0] = '\0'; 233 /* 234 * Catch interrupts to reset active counter and 235 * cleanup temp files. 236 */ 237 if (setjmp(jmploc.loc)) { 238 active = 0; 239 if (*editfile) 240 unlink(editfile); 241 handler = savehandler; 242 longjmp(handler->loc, 1); 243 } 244 savehandler = handler; 245 handler = &jmploc; 246 if (++active > MAXHISTLOOPS) { 247 active = 0; 248 displayhist = 0; 249 error("called recursively too many times"); 250 } 251 /* 252 * Set editor. 253 */ 254 if (sflg == 0) { 255 if (editor == NULL && 256 (editor = bltinlookup("FCEDIT", 1)) == NULL && 257 (editor = bltinlookup("EDITOR", 1)) == NULL) 258 editor = DEFEDITOR; 259 if (editor[0] == '-' && editor[1] == '\0') { 260 sflg = 1; /* no edit */ 261 editor = NULL; 262 } 263 } 264 } 265 266 /* 267 * If executing, parse [old=new] now 268 */ 269 if (lflg == 0 && argc > 0 && 270 ((repl = strchr(argv[0], '=')) != NULL)) { 271 pat = argv[0]; 272 *repl++ = '\0'; 273 argc--, argv++; 274 } 275 /* 276 * determine [first] and [last] 277 */ 278 switch (argc) { 279 case 0: 280 firststr = lflg ? "-16" : "-1"; 281 laststr = "-1"; 282 break; 283 case 1: 284 firststr = argv[0]; 285 laststr = lflg ? "-1" : argv[0]; 286 break; 287 case 2: 288 firststr = argv[0]; 289 laststr = argv[1]; 290 break; 291 default: 292 error("too many args"); 293 } 294 /* 295 * Turn into event numbers. 296 */ 297 first = str_to_event(firststr, 0); 298 last = str_to_event(laststr, 1); 299 300 if (rflg) { 301 i = last; 302 last = first; 303 first = i; 304 } 305 /* 306 * XXX - this should not depend on the event numbers 307 * always increasing. Add sequence numbers or offset 308 * to the history element in next (diskbased) release. 309 */ 310 direction = first < last ? H_PREV : H_NEXT; 311 312 /* 313 * If editing, grab a temp file. 314 */ 315 if (editor) { 316 int fd; 317 INTOFF; /* easier */ 318 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); 319 if ((fd = mkstemp(editfile)) < 0) 320 error("can't create temporary file %s", editfile); 321 if ((efp = fdopen(fd, "w")) == NULL) { 322 close(fd); 323 error("can't allocate stdio buffer for temp"); 324 } 325 } 326 327 /* 328 * Loop through selected history events. If listing or executing, 329 * do it now. Otherwise, put into temp file and call the editor 330 * after. 331 * 332 * The history interface needs rethinking, as the following 333 * convolutions will demonstrate. 334 */ 335 history(hist, &he, H_FIRST); 336 retval = history(hist, &he, H_NEXT_EVENT, first); 337 for (;retval != -1; retval = history(hist, &he, direction)) { 338 if (lflg) { 339 if (!nflg) 340 out1fmt("%5d ", he.num); 341 out1str(he.str); 342 } else { 343 const char *s = pat ? 344 fc_replace(he.str, pat, repl) : he.str; 345 346 if (sflg) { 347 if (displayhist) { 348 out2str(s); 349 } 350 evalstring(strcpy(stalloc(strlen(s) + 1), s)); 351 if (displayhist && hist) { 352 /* 353 * XXX what about recursive and 354 * relative histnums. 355 */ 356 oldhistnum = he.num; 357 history(hist, &he, H_ENTER, s); 358 /* 359 * XXX H_ENTER moves the internal 360 * cursor, set it back to the current 361 * entry. 362 */ 363 retval = history(hist, &he, 364 H_NEXT_EVENT, oldhistnum); 365 } 366 } else 367 fputs(s, efp); 368 } 369 /* 370 * At end? (if we were to lose last, we'd sure be 371 * messed up). 372 */ 373 if (he.num == last) 374 break; 375 } 376 if (editor) { 377 char *editcmd; 378 379 fclose(efp); 380 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 381 sprintf(editcmd, "%s %s", editor, editfile); 382 evalstring(editcmd); /* XXX - should use no JC command */ 383 INTON; 384 readcmdfile(editfile); /* XXX - should read back - quick tst */ 385 unlink(editfile); 386 } 387 388 if (lflg == 0 && active > 0) 389 --active; 390 if (displayhist) 391 displayhist = 0; 392 return 0; 393 } 394 395 STATIC char * 396 fc_replace(const char *s, char *p, char *r) 397 { 398 char *dest; 399 int plen = strlen(p); 400 401 STARTSTACKSTR(dest); 402 while (*s) { 403 if (*s == *p && strncmp(s, p, plen) == 0) { 404 while (*r) 405 STPUTC(*r++, dest); 406 s += plen; 407 *p = '\0'; /* so no more matches */ 408 } else 409 STPUTC(*s++, dest); 410 } 411 STACKSTRNUL(dest); 412 dest = grabstackstr(dest); 413 414 return (dest); 415 } 416 417 int 418 not_fcnumber(char *s) 419 { 420 if (s == NULL) 421 return (0); 422 if (*s == '-') 423 s++; 424 return (!is_number(s)); 425 } 426 427 int 428 str_to_event(const char *str, int last) 429 { 430 HistEvent he; 431 const char *s = str; 432 int relative = 0; 433 int i, retval; 434 435 retval = history(hist, &he, H_FIRST); 436 switch (*s) { 437 case '-': 438 relative = 1; 439 /*FALLTHROUGH*/ 440 case '+': 441 s++; 442 } 443 if (is_number(s)) { 444 i = atoi(s); 445 if (relative) { 446 while (retval != -1 && i--) { 447 retval = history(hist, &he, H_NEXT); 448 } 449 if (retval == -1) 450 retval = history(hist, &he, H_LAST); 451 } else { 452 retval = history(hist, &he, H_NEXT_EVENT, i); 453 if (retval == -1) { 454 /* 455 * the notion of first and last is 456 * backwards to that of the history package 457 */ 458 retval = history(hist, &he, last ? H_FIRST : H_LAST); 459 } 460 } 461 if (retval == -1) 462 error("history number %s not found (internal error)", 463 str); 464 } else { 465 /* 466 * pattern 467 */ 468 retval = history(hist, &he, H_PREV_STR, str); 469 if (retval == -1) 470 error("history pattern not found: %s", str); 471 } 472 return (he.num); 473 } 474 475 int 476 bindcmd(int argc, char **argv) 477 { 478 479 if (el == NULL) 480 error("line editing is disabled"); 481 return (el_parse(el, argc, (const char **)argv)); 482 } 483 484 #else 485 #include "error.h" 486 487 int 488 histcmd(int argc, char **argv) 489 { 490 491 error("not compiled with history support"); 492 /*NOTREACHED*/ 493 return (0); 494 } 495 496 int 497 bindcmd(int argc, char **argv) 498 { 499 500 error("not compiled with line editing support"); 501 return (0); 502 } 503 #endif 504