1 /* $NetBSD: histedit.c,v 1.23 2000/04/14 05:52:58 simonb 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 1.23 2000/04/14 05:52:58 simonb 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 #include "myhistedit.h" 64 #include "error.h" 65 #ifndef SMALL 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 const 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, 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 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_SETSIZE, histsize); 163 } 164 } 165 166 void 167 setterm(term) 168 const char *term; 169 { 170 if (el != NULL && term != NULL) 171 if (el_set(el, EL_TERMINAL, term) != 0) { 172 outfmt(out2, "sh: Can't set terminal type %s\n", term); 173 outfmt(out2, "sh: Using dumb terminal settings.\n"); 174 } 175 } 176 177 /* 178 * This command is provided since POSIX decided to standardize 179 * the Korn shell fc command. Oh well... 180 */ 181 int 182 histcmd(argc, argv) 183 int argc; 184 char **argv; 185 { 186 int ch; 187 const char *editor = NULL; 188 HistEvent he; 189 int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 190 int i, retval; 191 const char *firststr, *laststr; 192 int first, last, direction; 193 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 194 static int active = 0; 195 struct jmploc jmploc; 196 struct jmploc *volatile savehandler; 197 char editfile[MAXPATHLEN + 1]; 198 FILE *efp; 199 #ifdef __GNUC__ 200 /* Avoid longjmp clobbering */ 201 (void) &editor; 202 (void) &lflg; 203 (void) &nflg; 204 (void) &rflg; 205 (void) &sflg; 206 (void) &firststr; 207 (void) &laststr; 208 (void) &pat; 209 (void) &repl; 210 (void) &efp; 211 (void) &argc; 212 (void) &argv; 213 #endif 214 215 if (hist == NULL) 216 error("history not active"); 217 218 if (argc == 1) 219 error("missing history argument"); 220 221 optreset = 1; optind = 1; /* initialize getopt */ 222 while (not_fcnumber(argv[optind]) && 223 (ch = getopt(argc, argv, ":e:lnrs")) != -1) 224 switch ((char)ch) { 225 case 'e': 226 editor = optarg; 227 break; 228 case 'l': 229 lflg = 1; 230 break; 231 case 'n': 232 nflg = 1; 233 break; 234 case 'r': 235 rflg = 1; 236 break; 237 case 's': 238 sflg = 1; 239 break; 240 case ':': 241 error("option -%c expects argument", optopt); 242 /* NOTREACHED */ 243 case '?': 244 default: 245 error("unknown option: -%c", optopt); 246 /* NOTREACHED */ 247 } 248 argc -= optind, argv += optind; 249 250 /* 251 * If executing... 252 */ 253 if (lflg == 0 || editor || sflg) { 254 lflg = 0; /* ignore */ 255 editfile[0] = '\0'; 256 /* 257 * Catch interrupts to reset active counter and 258 * cleanup temp files. 259 */ 260 if (setjmp(jmploc.loc)) { 261 active = 0; 262 if (*editfile) 263 unlink(editfile); 264 handler = savehandler; 265 longjmp(handler->loc, 1); 266 } 267 savehandler = handler; 268 handler = &jmploc; 269 if (++active > MAXHISTLOOPS) { 270 active = 0; 271 displayhist = 0; 272 error("called recursively too many times"); 273 } 274 /* 275 * Set editor. 276 */ 277 if (sflg == 0) { 278 if (editor == NULL && 279 (editor = bltinlookup("FCEDIT", 1)) == NULL && 280 (editor = bltinlookup("EDITOR", 1)) == NULL) 281 editor = DEFEDITOR; 282 if (editor[0] == '-' && editor[1] == '\0') { 283 sflg = 1; /* no edit */ 284 editor = NULL; 285 } 286 } 287 } 288 289 /* 290 * If executing, parse [old=new] now 291 */ 292 if (lflg == 0 && argc > 0 && 293 ((repl = strchr(argv[0], '=')) != NULL)) { 294 pat = argv[0]; 295 *repl++ = '\0'; 296 argc--, argv++; 297 } 298 /* 299 * determine [first] and [last] 300 */ 301 switch (argc) { 302 case 0: 303 firststr = lflg ? "-16" : "-1"; 304 laststr = "-1"; 305 break; 306 case 1: 307 firststr = argv[0]; 308 laststr = lflg ? "-1" : argv[0]; 309 break; 310 case 2: 311 firststr = argv[0]; 312 laststr = argv[1]; 313 break; 314 default: 315 error("too many args"); 316 /* NOTREACHED */ 317 } 318 /* 319 * Turn into event numbers. 320 */ 321 first = str_to_event(firststr, 0); 322 last = str_to_event(laststr, 1); 323 324 if (rflg) { 325 i = last; 326 last = first; 327 first = i; 328 } 329 /* 330 * XXX - this should not depend on the event numbers 331 * always increasing. Add sequence numbers or offset 332 * to the history element in next (diskbased) release. 333 */ 334 direction = first < last ? H_PREV : H_NEXT; 335 336 /* 337 * If editing, grab a temp file. 338 */ 339 if (editor) { 340 int fd; 341 INTOFF; /* easier */ 342 sprintf(editfile, "%s_shXXXXXX", _PATH_TMP); 343 if ((fd = mkstemp(editfile)) < 0) 344 error("can't create temporary file %s", editfile); 345 if ((efp = fdopen(fd, "w")) == NULL) { 346 close(fd); 347 error("can't allocate stdio buffer for temp"); 348 } 349 } 350 351 /* 352 * Loop through selected history events. If listing or executing, 353 * do it now. Otherwise, put into temp file and call the editor 354 * after. 355 * 356 * The history interface needs rethinking, as the following 357 * convolutions will demonstrate. 358 */ 359 history(hist, &he, H_FIRST); 360 retval = history(hist, &he, H_NEXT_EVENT, first); 361 for (;retval != -1; retval = history(hist, &he, direction)) { 362 if (lflg) { 363 if (!nflg) 364 out1fmt("%5d ", he.num); 365 out1str(he.str); 366 } else { 367 const char *s = pat ? 368 fc_replace(he.str, pat, repl) : he.str; 369 char *sp; 370 371 if (sflg) { 372 if (displayhist) { 373 out2str(s); 374 } 375 376 evalstring(strcpy(stalloc(strlen(s) + 1), s), 0); 377 free(sp); 378 if (displayhist && hist) { 379 /* 380 * XXX what about recursive and 381 * relative histnums. 382 */ 383 history(hist, &he, H_ENTER, s); 384 } 385 } else 386 fputs(s, efp); 387 } 388 /* 389 * At end? (if we were to lose last, we'd sure be 390 * messed up). 391 */ 392 if (he.num == last) 393 break; 394 } 395 if (editor) { 396 char *editcmd; 397 398 fclose(efp); 399 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 400 sprintf(editcmd, "%s %s", editor, editfile); 401 evalstring(editcmd, 0); /* XXX - should use no JC command */ 402 INTON; 403 readcmdfile(editfile); /* XXX - should read back - quick tst */ 404 unlink(editfile); 405 } 406 407 if (lflg == 0 && active > 0) 408 --active; 409 if (displayhist) 410 displayhist = 0; 411 return 0; 412 } 413 414 STATIC const char * 415 fc_replace(s, p, r) 416 const char *s; 417 char *p, *r; 418 { 419 char *dest; 420 int plen = strlen(p); 421 422 STARTSTACKSTR(dest); 423 while (*s) { 424 if (*s == *p && strncmp(s, p, plen) == 0) { 425 while (*r) 426 STPUTC(*r++, dest); 427 s += plen; 428 *p = '\0'; /* so no more matches */ 429 } else 430 STPUTC(*s++, dest); 431 } 432 STACKSTRNUL(dest); 433 dest = grabstackstr(dest); 434 435 return (dest); 436 } 437 438 int 439 not_fcnumber(s) 440 char *s; 441 { 442 if (s == NULL) 443 return 0; 444 if (*s == '-') 445 s++; 446 return (!is_number(s)); 447 } 448 449 int 450 str_to_event(str, last) 451 const char *str; 452 int last; 453 { 454 HistEvent he; 455 const char *s = str; 456 int relative = 0; 457 int i, retval; 458 459 retval = history(hist, &he, H_FIRST); 460 switch (*s) { 461 case '-': 462 relative = 1; 463 /*FALLTHROUGH*/ 464 case '+': 465 s++; 466 } 467 if (is_number(s)) { 468 i = atoi(s); 469 if (relative) { 470 while (retval != -1 && i--) { 471 retval = history(hist, &he, H_NEXT); 472 } 473 if (retval == -1) 474 retval = history(hist, &he, H_LAST); 475 } else { 476 retval = history(hist, &he, H_NEXT_EVENT, i); 477 if (retval == -1) { 478 /* 479 * the notion of first and last is 480 * backwards to that of the history package 481 */ 482 retval = history(hist, &he, 483 last ? H_FIRST : H_LAST); 484 } 485 } 486 if (retval == -1) 487 error("history number %s not found (internal error)", 488 str); 489 } else { 490 /* 491 * pattern 492 */ 493 retval = history(hist, &he, H_PREV_STR, str); 494 if (retval == -1) 495 error("history pattern not found: %s", str); 496 } 497 return (he.num); 498 } 499 #else 500 int 501 histcmd(argc, argv) 502 int argc; 503 char **argv; 504 { 505 error("not compiled with history support"); 506 /* NOTREACHED */ 507 } 508 #endif 509