histedit.c revision 100568
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 39static char sccsid[] = "@(#)histedit.c 8.2 (Berkeley) 5/4/95"; 40#endif 41#endif /* not lint */ 42#include <sys/cdefs.h> 43__FBSDID("$FreeBSD: head/bin/sh/histedit.c 100568 2002-07-23 12:26:34Z tjr $"); 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 70History *hist; /* history cookie */ 71EditLine *el; /* editline cookie */ 72int displayhist; 73static FILE *el_in, *el_out, *el_err; 74 75STATIC char *fc_replace(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 */ 81void 82histedit(void) 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 { 120bad: 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 el_source(el, NULL); 136 } 137 } else { 138 INTOFF; 139 if (el) { /* no editing if not interactive */ 140 el_end(el); 141 el = NULL; 142 } 143 if (hist) { 144 history_end(hist); 145 hist = NULL; 146 } 147 INTON; 148 } 149} 150 151 152void 153sethistsize(hs) 154 const char *hs; 155{ 156 int histsize; 157 HistEvent he; 158 159 if (hist != NULL) { 160 if (hs == NULL || *hs == '\0' || 161 (histsize = atoi(hs)) < 0) 162 histsize = 100; 163 history(hist, &he, H_EVENT, histsize); 164 } 165} 166 167/* 168 * This command is provided since POSIX decided to standardize 169 * the Korn shell fc command. Oh well... 170 */ 171int 172histcmd(int argc, char **argv) 173{ 174 int ch; 175 char *editor = NULL; 176 HistEvent he; 177 int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 178 int i, retval; 179 char *firststr, *laststr; 180 int first, last, direction; 181 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 182 static int active = 0; 183 struct jmploc jmploc; 184 struct jmploc *volatile savehandler; 185 char editfile[PATH_MAX]; 186 FILE *efp; 187 int oldhistnum; 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 = optarg; 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 oldhistnum = he.num; 367 history(hist, &he, H_ENTER, s); 368 /* 369 * XXX H_ENTER moves the internal 370 * cursor, set it back to the current 371 * entry. 372 */ 373 retval = history(hist, &he, 374 H_NEXT_EVENT, oldhistnum); 375 } 376 } else 377 fputs(s, efp); 378 } 379 /* 380 * At end? (if we were to loose last, we'd sure be 381 * messed up). 382 */ 383 if (he.num == last) 384 break; 385 } 386 if (editor) { 387 char *editcmd; 388 389 fclose(efp); 390 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 391 sprintf(editcmd, "%s %s", editor, editfile); 392 evalstring(editcmd); /* XXX - should use no JC command */ 393 INTON; 394 readcmdfile(editfile); /* XXX - should read back - quick tst */ 395 unlink(editfile); 396 } 397 398 if (lflg == 0 && active > 0) 399 --active; 400 if (displayhist) 401 displayhist = 0; 402 return 0; 403} 404 405STATIC char * 406fc_replace(const char *s, char *p, char *r) 407{ 408 char *dest; 409 int plen = strlen(p); 410 411 STARTSTACKSTR(dest); 412 while (*s) { 413 if (*s == *p && strncmp(s, p, plen) == 0) { 414 while (*r) 415 STPUTC(*r++, dest); 416 s += plen; 417 *p = '\0'; /* so no more matches */ 418 } else 419 STPUTC(*s++, dest); 420 } 421 STACKSTRNUL(dest); 422 dest = grabstackstr(dest); 423 424 return (dest); 425} 426 427int 428not_fcnumber(char *s) 429{ 430 if (s == NULL) 431 return (0); 432 if (*s == '-') 433 s++; 434 return (!is_number(s)); 435} 436 437int 438str_to_event(char *str, int last) 439{ 440 HistEvent he; 441 char *s = str; 442 int relative = 0; 443 int i, retval; 444 445 retval = history(hist, &he, H_FIRST); 446 switch (*s) { 447 case '-': 448 relative = 1; 449 /*FALLTHROUGH*/ 450 case '+': 451 s++; 452 } 453 if (is_number(s)) { 454 i = atoi(s); 455 if (relative) { 456 while (retval != -1 && i--) { 457 retval = history(hist, &he, H_NEXT); 458 } 459 if (retval == -1) 460 retval = history(hist, &he, H_LAST); 461 } else { 462 retval = history(hist, &he, H_NEXT_EVENT, i); 463 if (retval == -1) { 464 /* 465 * the notion of first and last is 466 * backwards to that of the history package 467 */ 468 retval = history(hist, &he, last ? H_FIRST : H_LAST); 469 } 470 } 471 if (retval == -1) 472 error("history number %s not found (internal error)", 473 str); 474 } else { 475 /* 476 * pattern 477 */ 478 retval = history(hist, &he, H_PREV_STR, str); 479 if (retval == -1) 480 error("history pattern not found: %s", str); 481 } 482 return (he.num); 483} 484 485int 486bindcmd(int argc, char **argv) 487{ 488 489 if (el == NULL) 490 error("line editing is disabled"); 491 return (el_parse(el, argc, argv)); 492} 493 494#else 495#include "error.h" 496 497int 498histcmd(int argc, char **argv) 499{ 500 501 error("not compiled with history support"); 502 /*NOTREACHED*/ 503 return (0); 504} 505 506int 507bindcmd(int argc, char **argv) 508{ 509 510 error("not compiled with line editing support"); 511 return (0); 512} 513#endif 514