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 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)histedit.c 8.2 (Berkeley) 5/4/95"; 40 #endif 41 static const char rcsid[] = 42 "$Id$"; 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <paths.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <unistd.h> 50 /* 51 * Editline and history functions (and glue). 52 */ 53 #include "shell.h" 54 #include "parser.h" 55 #include "var.h" 56 #include "options.h" 57 #include "main.h" 58 #include "output.h" 59 #include "mystring.h" 60 #ifndef NO_HISTORY 61 #include "myhistedit.h" 62 #include "error.h" 63 #include "eval.h" 64 #include "memalloc.h" 65 66 #define MAXHISTLOOPS 4 /* max recursions through fc */ 67 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ 68 69 History *hist; /* history cookie */ 70 EditLine *el; /* editline cookie */ 71 int displayhist; 72 static FILE *el_in, *el_out; 73 74 STATIC char *fc_replace __P((const char *, char *, char *)); 75 76 /* 77 * Set history and editing status. Called whenever the status may 78 * have changed (figures out what to do). 79 */ 80 void 81 histedit() 82 { 83 84 #define editing (Eflag || Vflag) 85 86 if (iflag) { 87 if (!hist) { 88 /* 89 * turn history on 90 */ 91 INTOFF; 92 hist = history_init(); 93 INTON; 94 95 if (hist != NULL) 96 sethistsize(histsizeval()); 97 else 98 out2str("sh: can't initialize history\n"); 99 } 100 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ 101 /* 102 * turn editing on 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 = el_init(arg0, el_in, el_out); 112 if (el != NULL) { 113 if (hist) 114 el_set(el, EL_HIST, history, hist); 115 el_set(el, EL_PROMPT, getprompt); 116 } else { 117 bad: 118 out2str("sh: can't initialize editing\n"); 119 } 120 INTON; 121 } else if (!editing && el) { 122 INTOFF; 123 el_end(el); 124 el = NULL; 125 INTON; 126 } 127 if (el) { 128 if (Vflag) 129 el_set(el, EL_EDITOR, "vi"); 130 else if (Eflag) 131 el_set(el, EL_EDITOR, "emacs"); 132 } 133 } else { 134 INTOFF; 135 if (el) { /* no editing if not interactive */ 136 el_end(el); 137 el = NULL; 138 } 139 if (hist) { 140 history_end(hist); 141 hist = NULL; 142 } 143 INTON; 144 } 145 } 146 147 148 void 149 sethistsize(hs) 150 const char *hs; 151 { 152 int histsize; 153 154 if (hist != NULL) { 155 if (hs == NULL || *hs == '\0' || 156 (histsize = atoi(hs)) < 0) 157 histsize = 100; 158 history(hist, H_EVENT, histsize); 159 } 160 } 161 162 /* 163 * This command is provided since POSIX decided to standardize 164 * the Korn shell fc command. Oh well... 165 */ 166 int 167 histcmd(argc, argv) 168 int argc; 169 char **argv; 170 { 171 extern char *optarg; 172 extern int optind, optopt, optreset; 173 int ch; 174 char *editor = NULL; 175 const HistEvent *he; 176 int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 177 int i; 178 char *firststr, *laststr; 179 int first, last, direction; 180 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 181 static int active = 0; 182 struct jmploc jmploc; 183 struct jmploc *volatile savehandler; 184 char editfile[MAXPATHLEN + 1]; 185 FILE *efp; 186 #ifdef __GNUC__ 187 /* Avoid longjmp clobbering */ 188 (void) &editor; 189 (void) &lflg; 190 (void) &nflg; 191 (void) &rflg; 192 (void) &sflg; 193 (void) &firststr; 194 (void) &laststr; 195 (void) &pat; 196 (void) &repl; 197 (void) &efp; 198 (void) &argc; 199 (void) &argv; 200 #endif 201 202 if (hist == NULL) 203 error("history not active"); 204 205 if (argc == 1) 206 error("missing history argument"); 207 208 optreset = 1; optind = 1; /* initialize getopt */ 209 while (not_fcnumber(argv[optind]) && 210 (ch = getopt(argc, argv, ":e:lnrs")) != -1) 211 switch ((char)ch) { 212 case 'e': 213 editor = optarg; 214 break; 215 case 'l': 216 lflg = 1; 217 break; 218 case 'n': 219 nflg = 1; 220 break; 221 case 'r': 222 rflg = 1; 223 break; 224 case 's': 225 sflg = 1; 226 break; 227 case ':': 228 error("option -%c expects argument", optopt); 229 case '?': 230 default: 231 error("unknown option: -%c", optopt); 232 } 233 argc -= optind, argv += optind; 234 235 /* 236 * If executing... 237 */ 238 if (lflg == 0 || editor || sflg) { 239 lflg = 0; /* ignore */ 240 editfile[0] = '\0'; 241 /* 242 * Catch interrupts to reset active counter and 243 * cleanup temp files. 244 */ 245 if (setjmp(jmploc.loc)) { 246 active = 0; 247 if (*editfile) 248 unlink(editfile); 249 handler = savehandler; 250 longjmp(handler->loc, 1); 251 } 252 savehandler = handler; 253 handler = &jmploc; 254 if (++active > MAXHISTLOOPS) { 255 active = 0; 256 displayhist = 0; 257 error("called recursively too many times"); 258 } 259 /* 260 * Set editor. 261 */ 262 if (sflg == 0) { 263 if (editor == NULL && 264 (editor = bltinlookup("FCEDIT", 1)) == NULL && 265 (editor = bltinlookup("EDITOR", 1)) == NULL) 266 editor = DEFEDITOR; 267 if (editor[0] == '-' && editor[1] == '\0') { 268 sflg = 1; /* no edit */ 269 editor = NULL; 270 } 271 } 272 } 273 274 /* 275 * If executing, parse [old=new] now 276 */ 277 if (lflg == 0 && argc > 0 && 278 ((repl = strchr(argv[0], '=')) != NULL)) { 279 pat = argv[0]; 280 *repl++ = '\0'; 281 argc--, argv++; 282 } 283 /* 284 * determine [first] and [last] 285 */ 286 switch (argc) { 287 case 0: 288 firststr = lflg ? "-16" : "-1"; 289 laststr = "-1"; 290 break; 291 case 1: 292 firststr = argv[0]; 293 laststr = lflg ? "-1" : argv[0]; 294 break; 295 case 2: 296 firststr = argv[0]; 297 laststr = argv[1]; 298 break; 299 default: 300 error("too many args"); 301 } 302 /* 303 * Turn into event numbers. 304 */ 305 first = str_to_event(firststr, 0); 306 last = str_to_event(laststr, 1); 307 308 if (rflg) { 309 i = last; 310 last = first; 311 first = i; 312 } 313 /* 314 * XXX - this should not depend on the event numbers 315 * always increasing. Add sequence numbers or offset 316 * to the history element in next (diskbased) release. 317 */ 318 direction = first < last ? H_PREV : H_NEXT; 319 320 /* 321 * If editing, grab a temp file. 322 */ 323 if (editor) { 324 int fd; 325 INTOFF; /* easier */ 326 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); 327 if ((fd = mkstemp(editfile)) < 0) 328 error("can't create temporary file %s", editfile); 329 if ((efp = fdopen(fd, "w")) == NULL) { 330 close(fd); 331 error("can't allocate stdio buffer for temp"); 332 } 333 } 334 335 /* 336 * Loop through selected history events. If listing or executing, 337 * do it now. Otherwise, put into temp file and call the editor 338 * after. 339 * 340 * The history interface needs rethinking, as the following 341 * convolutions will demonstrate. 342 */ 343 history(hist, H_FIRST); 344 he = history(hist, H_NEXT_EVENT, first); 345 for (;he != NULL; he = history(hist, direction)) { 346 if (lflg) { 347 if (!nflg) 348 out1fmt("%5d ", he->num); 349 out1str(he->str); 350 } else { 351 char *s = pat ? 352 fc_replace(he->str, pat, repl) : (char *)he->str; 353 354 if (sflg) { 355 if (displayhist) { 356 out2str(s); 357 } 358 evalstring(s); 359 if (displayhist && hist) { 360 /* 361 * XXX what about recursive and 362 * relative histnums. 363 */ 364 history(hist, H_ENTER, s); 365 } 366 } else 367 fputs(s, efp); 368 } 369 /* 370 * At end? (if we were to loose 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(s, p, r) 397 const char *s; 398 char *p, *r; 399 { 400 char *dest; 401 int plen = strlen(p); 402 403 STARTSTACKSTR(dest); 404 while (*s) { 405 if (*s == *p && strncmp(s, p, plen) == 0) { 406 while (*r) 407 STPUTC(*r++, dest); 408 s += plen; 409 *p = '\0'; /* so no more matches */ 410 } else 411 STPUTC(*s++, dest); 412 } 413 STACKSTRNUL(dest); 414 dest = grabstackstr(dest); 415 416 return (dest); 417 } 418 419 int 420 not_fcnumber(s) 421 char *s; 422 { 423 if (s == NULL) 424 return (0); 425 if (*s == '-') 426 s++; 427 return (!is_number(s)); 428 } 429 430 int 431 str_to_event(str, last) 432 char *str; 433 int last; 434 { 435 const HistEvent *he; 436 char *s = str; 437 int relative = 0; 438 int i; 439 440 he = history(hist, 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 (he != NULL && i--) { 452 he = history(hist, H_NEXT); 453 } 454 if (he == NULL) 455 he = history(hist, H_LAST); 456 } else { 457 he = history(hist, H_NEXT_EVENT, i); 458 if (he == NULL) { 459 /* 460 * the notion of first and last is 461 * backwards to that of the history package 462 */ 463 he = history(hist, last ? H_FIRST : H_LAST); 464 } 465 } 466 if (he == NULL) 467 error("history number %s not found (internal error)", 468 str); 469 } else { 470 /* 471 * pattern 472 */ 473 he = history(hist, H_PREV_STR, str); 474 if (he == NULL) 475 error("history pattern not found: %s", str); 476 } 477 return (he->num); 478 } 479 #else 480 #include "error.h" 481 482 int 483 histcmd(argc, argv) 484 int argc; 485 char **argv; 486 { 487 488 error("not compiled with history support"); 489 /*NOTREACHED*/ 490 return (0); 491 } 492 #endif 493