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 "$FreeBSD$"; 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <limits.h> 47 #include <paths.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <unistd.h> 51 /* 52 * Editline and history functions (and glue). 53 */ 54 #include "shell.h" 55 #include "parser.h" 56 #include "var.h" 57 #include "options.h" 58 #include "main.h" 59 #include "output.h" 60 #include "mystring.h" 61 #ifndef NO_HISTORY 62 #include "myhistedit.h" 63 #include "error.h" 64 #include "eval.h" 65 #include "memalloc.h" 66 67 #define MAXHISTLOOPS 4 /* max recursions through fc */ 68 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ 69 70 History *hist; /* history cookie */ 71 EditLine *el; /* editline cookie */ 72 int displayhist; 73 static FILE *el_in, *el_out, *el_err; 74 75 STATIC char *fc_replace __P((const char *, char *, char *)); 76 77 /* 78 * Set history and editing status. Called whenever the status may 79 * have changed (figures out what to do). 80 */ 81 void 82 histedit() 83 { 84 85 #define editing (Eflag || Vflag) 86 87 if (iflag) { 88 if (!hist) { 89 /* 90 * turn history on 91 */ 92 INTOFF; 93 hist = history_init(); 94 INTON; 95 96 if (hist != NULL) 97 sethistsize(histsizeval()); 98 else 99 out2str("sh: can't initialize history\n"); 100 } 101 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ 102 /* 103 * turn editing on 104 */ 105 INTOFF; 106 if (el_in == NULL) 107 el_in = fdopen(0, "r"); 108 if (el_err == NULL) 109 el_err = fdopen(1, "w"); 110 if (el_out == NULL) 111 el_out = fdopen(2, "w"); 112 if (el_in == NULL || el_err == NULL || el_out == NULL) 113 goto bad; 114 el = el_init(arg0, el_in, el_out, el_err); 115 if (el != NULL) { 116 if (hist) 117 el_set(el, EL_HIST, history, hist); 118 el_set(el, EL_PROMPT, getprompt); 119 } else { 120 bad: 121 out2str("sh: can't initialize editing\n"); 122 } 123 INTON; 124 } else if (!editing && el) { 125 INTOFF; 126 el_end(el); 127 el = NULL; 128 INTON; 129 } 130 if (el) { 131 if (Vflag) 132 el_set(el, EL_EDITOR, "vi"); 133 else if (Eflag) 134 el_set(el, EL_EDITOR, "emacs"); 135 } 136 } else { 137 INTOFF; 138 if (el) { /* no editing if not interactive */ 139 el_end(el); 140 el = NULL; 141 } 142 if (hist) { 143 history_end(hist); 144 hist = NULL; 145 } 146 INTON; 147 } 148 } 149 150 151 void 152 sethistsize(hs) 153 const char *hs; 154 { 155 int histsize; 156 HistEvent he; 157 158 if (hist != NULL) { 159 if (hs == NULL || *hs == '\0' || 160 (histsize = atoi(hs)) < 0) 161 histsize = 100; 162 history(hist, &he, H_EVENT, histsize); 163 } 164 } 165 166 /* 167 * This command is provided since POSIX decided to standardize 168 * the Korn shell fc command. Oh well... 169 */ 170 int 171 histcmd(argc, argv) 172 int argc; 173 char **argv; 174 { 175 int ch; 176 char *editor = NULL; 177 HistEvent he; 178 int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 179 int i, retval; 180 char *firststr, *laststr; 181 int first, last, direction; 182 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 183 static int active = 0; 184 struct jmploc jmploc; 185 struct jmploc *volatile savehandler; 186 char editfile[PATH_MAX]; 187 FILE *efp; 188 #ifdef __GNUC__ 189 /* Avoid longjmp clobbering */ 190 (void) &editor; 191 (void) &lflg; 192 (void) &nflg; 193 (void) &rflg; 194 (void) &sflg; 195 (void) &firststr; 196 (void) &laststr; 197 (void) &pat; 198 (void) &repl; 199 (void) &efp; 200 (void) &argc; 201 (void) &argv; 202 #endif 203 204 if (hist == NULL) 205 error("history not active"); 206 207 if (argc == 1) 208 error("missing history argument"); 209 210 optreset = 1; optind = 1; /* initialize getopt */ 211 while (not_fcnumber(argv[optind]) && 212 (ch = getopt(argc, argv, ":e:lnrs")) != -1) 213 switch ((char)ch) { 214 case 'e': 215 editor = shoptarg; 216 break; 217 case 'l': 218 lflg = 1; 219 break; 220 case 'n': 221 nflg = 1; 222 break; 223 case 'r': 224 rflg = 1; 225 break; 226 case 's': 227 sflg = 1; 228 break; 229 case ':': 230 error("option -%c expects argument", optopt); 231 case '?': 232 default: 233 error("unknown option: -%c", optopt); 234 } 235 argc -= optind, argv += optind; 236 237 /* 238 * If executing... 239 */ 240 if (lflg == 0 || editor || sflg) { 241 lflg = 0; /* ignore */ 242 editfile[0] = '\0'; 243 /* 244 * Catch interrupts to reset active counter and 245 * cleanup temp files. 246 */ 247 if (setjmp(jmploc.loc)) { 248 active = 0; 249 if (*editfile) 250 unlink(editfile); 251 handler = savehandler; 252 longjmp(handler->loc, 1); 253 } 254 savehandler = handler; 255 handler = &jmploc; 256 if (++active > MAXHISTLOOPS) { 257 active = 0; 258 displayhist = 0; 259 error("called recursively too many times"); 260 } 261 /* 262 * Set editor. 263 */ 264 if (sflg == 0) { 265 if (editor == NULL && 266 (editor = bltinlookup("FCEDIT", 1)) == NULL && 267 (editor = bltinlookup("EDITOR", 1)) == NULL) 268 editor = DEFEDITOR; 269 if (editor[0] == '-' && editor[1] == '\0') { 270 sflg = 1; /* no edit */ 271 editor = NULL; 272 } 273 } 274 } 275 276 /* 277 * If executing, parse [old=new] now 278 */ 279 if (lflg == 0 && argc > 0 && 280 ((repl = strchr(argv[0], '=')) != NULL)) { 281 pat = argv[0]; 282 *repl++ = '\0'; 283 argc--, argv++; 284 } 285 /* 286 * determine [first] and [last] 287 */ 288 switch (argc) { 289 case 0: 290 firststr = lflg ? "-16" : "-1"; 291 laststr = "-1"; 292 break; 293 case 1: 294 firststr = argv[0]; 295 laststr = lflg ? "-1" : argv[0]; 296 break; 297 case 2: 298 firststr = argv[0]; 299 laststr = argv[1]; 300 break; 301 default: 302 error("too many args"); 303 } 304 /* 305 * Turn into event numbers. 306 */ 307 first = str_to_event(firststr, 0); 308 last = str_to_event(laststr, 1); 309 310 if (rflg) { 311 i = last; 312 last = first; 313 first = i; 314 } 315 /* 316 * XXX - this should not depend on the event numbers 317 * always increasing. Add sequence numbers or offset 318 * to the history element in next (diskbased) release. 319 */ 320 direction = first < last ? H_PREV : H_NEXT; 321 322 /* 323 * If editing, grab a temp file. 324 */ 325 if (editor) { 326 int fd; 327 INTOFF; /* easier */ 328 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); 329 if ((fd = mkstemp(editfile)) < 0) 330 error("can't create temporary file %s", editfile); 331 if ((efp = fdopen(fd, "w")) == NULL) { 332 close(fd); 333 error("can't allocate stdio buffer for temp"); 334 } 335 } 336 337 /* 338 * Loop through selected history events. If listing or executing, 339 * do it now. Otherwise, put into temp file and call the editor 340 * after. 341 * 342 * The history interface needs rethinking, as the following 343 * convolutions will demonstrate. 344 */ 345 history(hist, &he, H_FIRST); 346 retval = history(hist, &he, H_NEXT_EVENT, first); 347 for (;retval != -1; retval = history(hist, &he, direction)) { 348 if (lflg) { 349 if (!nflg) 350 out1fmt("%5d ", he.num); 351 out1str(he.str); 352 } else { 353 char *s = pat ? 354 fc_replace(he.str, pat, repl) : (char *)he.str; 355 356 if (sflg) { 357 if (displayhist) { 358 out2str(s); 359 } 360 evalstring(s); 361 if (displayhist && hist) { 362 /* 363 * XXX what about recursive and 364 * relative histnums. 365 */ 366 history(hist, &he, H_ENTER, s); 367 } 368 } else 369 fputs(s, efp); 370 } 371 /* 372 * At end? (if we were to loose last, we'd sure be 373 * messed up). 374 */ 375 if (he.num == last) 376 break; 377 } 378 if (editor) { 379 char *editcmd; 380 381 fclose(efp); 382 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 383 sprintf(editcmd, "%s %s", editor, editfile); 384 evalstring(editcmd); /* XXX - should use no JC command */ 385 INTON; 386 readcmdfile(editfile); /* XXX - should read back - quick tst */ 387 unlink(editfile); 388 } 389 390 if (lflg == 0 && active > 0) 391 --active; 392 if (displayhist) 393 displayhist = 0; 394 return 0; 395 } 396 397 STATIC char * 398 fc_replace(s, p, r) 399 const char *s; 400 char *p, *r; 401 { 402 char *dest; 403 int plen = strlen(p); 404 405 STARTSTACKSTR(dest); 406 while (*s) { 407 if (*s == *p && strncmp(s, p, plen) == 0) { 408 while (*r) 409 STPUTC(*r++, dest); 410 s += plen; 411 *p = '\0'; /* so no more matches */ 412 } else 413 STPUTC(*s++, dest); 414 } 415 STACKSTRNUL(dest); 416 dest = grabstackstr(dest); 417 418 return (dest); 419 } 420 421 int 422 not_fcnumber(s) 423 char *s; 424 { 425 if (s == NULL) 426 return (0); 427 if (*s == '-') 428 s++; 429 return (!is_number(s)); 430 } 431 432 int 433 str_to_event(str, last) 434 char *str; 435 int last; 436 { 437 HistEvent he; 438 char *s = str; 439 int relative = 0; 440 int i, retval; 441 442 retval = 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 #else 482 #include "error.h" 483 484 int 485 histcmd(argc, argv) 486 int argc; 487 char **argv; 488 { 489 490 error("not compiled with history support"); 491 /*NOTREACHED*/ 492 return (0); 493 } 494 #endif 495