1 /* $NetBSD: histedit.c,v 1.14 1997/07/04 21:02:02 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)histedit.c 8.2 (Berkeley) 5/4/95"; 43 #else 44 __RCSID("$NetBSD: histedit.c,v 1.14 1997/07/04 21:02:02 christos Exp $"); 45 #endif 46 #endif /* not lint */ 47 48 #include <sys/param.h> 49 #include <paths.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <unistd.h> 53 /* 54 * Editline and history functions (and glue). 55 */ 56 #include "shell.h" 57 #include "parser.h" 58 #include "var.h" 59 #include "options.h" 60 #include "main.h" 61 #include "output.h" 62 #include "mystring.h" 63 #ifndef SMALL 64 #include "myhistedit.h" 65 #include "error.h" 66 #include "eval.h" 67 #include "memalloc.h" 68 69 #define MAXHISTLOOPS 4 /* max recursions through fc */ 70 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ 71 72 History *hist; /* history cookie */ 73 EditLine *el; /* editline cookie */ 74 int displayhist; 75 static FILE *el_in, *el_out; 76 77 STATIC char *fc_replace __P((const char *, char *, char *)); 78 79 /* 80 * Set history and editing status. Called whenever the status may 81 * have changed (figures out what to do). 82 */ 83 void 84 histedit() 85 { 86 87 #define editing (Eflag || Vflag) 88 89 if (iflag) { 90 if (!hist) { 91 /* 92 * turn history on 93 */ 94 INTOFF; 95 hist = history_init(); 96 INTON; 97 98 if (hist != NULL) 99 sethistsize(histsizeval()); 100 else 101 out2str("sh: can't initialize history\n"); 102 } 103 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ 104 /* 105 * turn editing on 106 */ 107 INTOFF; 108 if (el_in == NULL) 109 el_in = fdopen(0, "r"); 110 if (el_out == NULL) 111 el_out = fdopen(2, "w"); 112 if (el_in == NULL || el_out == NULL) 113 goto bad; 114 el = el_init(arg0, el_in, el_out); 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; 156 157 if (hist != NULL) { 158 if (hs == NULL || *hs == '\0' || 159 (histsize = atoi(hs)) < 0) 160 histsize = 100; 161 history(hist, H_EVENT, histsize); 162 } 163 } 164 165 void 166 setterm(term) 167 const char *term; 168 { 169 if (el != NULL && term != NULL) 170 if (el_set(el, EL_TERMINAL, term) != 0) { 171 outfmt(out2, "sh: Can't set terminal type %s\n", term); 172 outfmt(out2, "sh: Using dumb terminal settings.\n"); 173 } 174 } 175 176 /* 177 * This command is provided since POSIX decided to standardize 178 * the Korn shell fc command. Oh well... 179 */ 180 int 181 histcmd(argc, argv) 182 int argc; 183 char **argv; 184 { 185 extern char *optarg; 186 extern int optind, optopt, optreset; 187 int ch; 188 char *editor = NULL; 189 const HistEvent *he; 190 int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 191 int i; 192 char *firststr, *laststr; 193 int first, last, direction; 194 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 195 static int active = 0; 196 struct jmploc jmploc; 197 struct jmploc *volatile savehandler; 198 char editfile[MAXPATHLEN + 1]; 199 FILE *efp; 200 #ifdef __GNUC__ 201 /* Avoid longjmp clobbering */ 202 (void) &editor; 203 (void) &lflg; 204 (void) &nflg; 205 (void) &rflg; 206 (void) &sflg; 207 (void) &firststr; 208 (void) &laststr; 209 (void) &pat; 210 (void) &repl; 211 (void) &efp; 212 (void) &argc; 213 (void) &argv; 214 #endif 215 216 if (hist == NULL) 217 error("history not active"); 218 219 if (argc == 1) 220 error("missing history argument"); 221 222 optreset = 1; optind = 1; /* initialize getopt */ 223 while (not_fcnumber(argv[optind]) && 224 (ch = getopt(argc, argv, ":e:lnrs")) != EOF) 225 switch ((char)ch) { 226 case 'e': 227 editor = optarg; 228 break; 229 case 'l': 230 lflg = 1; 231 break; 232 case 'n': 233 nflg = 1; 234 break; 235 case 'r': 236 rflg = 1; 237 break; 238 case 's': 239 sflg = 1; 240 break; 241 case ':': 242 error("option -%c expects argument", optopt); 243 case '?': 244 default: 245 error("unknown option: -%c", optopt); 246 } 247 argc -= optind, argv += optind; 248 249 /* 250 * If executing... 251 */ 252 if (lflg == 0 || editor || sflg) { 253 lflg = 0; /* ignore */ 254 editfile[0] = '\0'; 255 /* 256 * Catch interrupts to reset active counter and 257 * cleanup temp files. 258 */ 259 if (setjmp(jmploc.loc)) { 260 active = 0; 261 if (*editfile) 262 unlink(editfile); 263 handler = savehandler; 264 longjmp(handler->loc, 1); 265 } 266 savehandler = handler; 267 handler = &jmploc; 268 if (++active > MAXHISTLOOPS) { 269 active = 0; 270 displayhist = 0; 271 error("called recursively too many times"); 272 } 273 /* 274 * Set editor. 275 */ 276 if (sflg == 0) { 277 if (editor == NULL && 278 (editor = bltinlookup("FCEDIT", 1)) == NULL && 279 (editor = bltinlookup("EDITOR", 1)) == NULL) 280 editor = DEFEDITOR; 281 if (editor[0] == '-' && editor[1] == '\0') { 282 sflg = 1; /* no edit */ 283 editor = NULL; 284 } 285 } 286 } 287 288 /* 289 * If executing, parse [old=new] now 290 */ 291 if (lflg == 0 && argc > 0 && 292 ((repl = strchr(argv[0], '=')) != NULL)) { 293 pat = argv[0]; 294 *repl++ = '\0'; 295 argc--, argv++; 296 } 297 /* 298 * determine [first] and [last] 299 */ 300 switch (argc) { 301 case 0: 302 firststr = lflg ? "-16" : "-1"; 303 laststr = "-1"; 304 break; 305 case 1: 306 firststr = argv[0]; 307 laststr = lflg ? "-1" : argv[0]; 308 break; 309 case 2: 310 firststr = argv[0]; 311 laststr = argv[1]; 312 break; 313 default: 314 error("too many args"); 315 } 316 /* 317 * Turn into event numbers. 318 */ 319 first = str_to_event(firststr, 0); 320 last = str_to_event(laststr, 1); 321 322 if (rflg) { 323 i = last; 324 last = first; 325 first = i; 326 } 327 /* 328 * XXX - this should not depend on the event numbers 329 * always increasing. Add sequence numbers or offset 330 * to the history element in next (diskbased) release. 331 */ 332 direction = first < last ? H_PREV : H_NEXT; 333 334 /* 335 * If editing, grab a temp file. 336 */ 337 if (editor) { 338 int fd; 339 INTOFF; /* easier */ 340 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); 341 if ((fd = mkstemp(editfile)) < 0) 342 error("can't create temporary file %s", editfile); 343 if ((efp = fdopen(fd, "w")) == NULL) { 344 close(fd); 345 error("can't allocate stdio buffer for temp"); 346 } 347 } 348 349 /* 350 * Loop through selected history events. If listing or executing, 351 * do it now. Otherwise, put into temp file and call the editor 352 * after. 353 * 354 * The history interface needs rethinking, as the following 355 * convolutions will demonstrate. 356 */ 357 history(hist, H_FIRST); 358 he = history(hist, H_NEXT_EVENT, first); 359 for (;he != NULL; he = history(hist, direction)) { 360 if (lflg) { 361 if (!nflg) 362 out1fmt("%5d ", he->num); 363 out1str(he->str); 364 } else { 365 char *s = pat ? 366 fc_replace(he->str, pat, repl) : (char *)he->str; 367 368 if (sflg) { 369 if (displayhist) { 370 out2str(s); 371 } 372 evalstring(s); 373 if (displayhist && hist) { 374 /* 375 * XXX what about recursive and 376 * relative histnums. 377 */ 378 history(hist, H_ENTER, s); 379 } 380 } else 381 fputs(s, efp); 382 } 383 /* 384 * At end? (if we were to loose last, we'd sure be 385 * messed up). 386 */ 387 if (he->num == last) 388 break; 389 } 390 if (editor) { 391 char *editcmd; 392 393 fclose(efp); 394 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 395 sprintf(editcmd, "%s %s", editor, editfile); 396 evalstring(editcmd); /* XXX - should use no JC command */ 397 INTON; 398 readcmdfile(editfile); /* XXX - should read back - quick tst */ 399 unlink(editfile); 400 } 401 402 if (lflg == 0 && active > 0) 403 --active; 404 if (displayhist) 405 displayhist = 0; 406 return 0; 407 } 408 409 STATIC char * 410 fc_replace(s, p, r) 411 const char *s; 412 char *p, *r; 413 { 414 char *dest; 415 int plen = strlen(p); 416 417 STARTSTACKSTR(dest); 418 while (*s) { 419 if (*s == *p && strncmp(s, p, plen) == 0) { 420 while (*r) 421 STPUTC(*r++, dest); 422 s += plen; 423 *p = '\0'; /* so no more matches */ 424 } else 425 STPUTC(*s++, dest); 426 } 427 STACKSTRNUL(dest); 428 dest = grabstackstr(dest); 429 430 return (dest); 431 } 432 433 int 434 not_fcnumber(s) 435 char *s; 436 { 437 if (s == NULL) 438 return 0; 439 if (*s == '-') 440 s++; 441 return (!is_number(s)); 442 } 443 444 int 445 str_to_event(str, last) 446 char *str; 447 int last; 448 { 449 const HistEvent *he; 450 char *s = str; 451 int relative = 0; 452 int i; 453 454 he = history(hist, H_FIRST); 455 switch (*s) { 456 case '-': 457 relative = 1; 458 /*FALLTHROUGH*/ 459 case '+': 460 s++; 461 } 462 if (is_number(s)) { 463 i = atoi(s); 464 if (relative) { 465 while (he != NULL && i--) { 466 he = history(hist, H_NEXT); 467 } 468 if (he == NULL) 469 he = history(hist, H_LAST); 470 } else { 471 he = history(hist, H_NEXT_EVENT, i); 472 if (he == NULL) { 473 /* 474 * the notion of first and last is 475 * backwards to that of the history package 476 */ 477 he = history(hist, last ? H_FIRST : H_LAST); 478 } 479 } 480 if (he == NULL) 481 error("history number %s not found (internal error)", 482 str); 483 } else { 484 /* 485 * pattern 486 */ 487 he = history(hist, H_PREV_STR, str); 488 if (he == NULL) 489 error("history pattern not found: %s", str); 490 } 491 return (he->num); 492 } 493 #else 494 int 495 histcmd(argc, argv) 496 int argc; 497 char **argv; 498 { 499 error("not compiled with history support"); 500 } 501 #endif 502