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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)histedit.c 8.2 (Berkeley) 5/4/95"; 36 #endif 37 #endif /* not lint */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD: head/bin/sh/histedit.c 360139 2020-04-21 00:37:55Z bdrewery $"); 40 41 #include <sys/param.h> 42 #include <limits.h> 43 #include <paths.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <unistd.h> 47 /* 48 * Editline and history functions (and glue). 49 */ 50 #include "shell.h" 51 #include "parser.h" 52 #include "var.h" 53 #include "options.h" 54 #include "main.h" 55 #include "output.h" 56 #include "mystring.h" 57 #include "builtins.h" 58 #ifndef NO_HISTORY 59 #include "myhistedit.h" 60 #include "error.h" 61 #include "eval.h" 62 #include "memalloc.h" 63 64 #define MAXHISTLOOPS 4 /* max recursions through fc */ 65 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ 66 67 History *hist; /* history cookie */ 68 EditLine *el; /* editline cookie */ 69 int displayhist; 70 static FILE *el_in, *el_out; 71 72 static char *fc_replace(const char *, char *, char *); 73 static int not_fcnumber(const char *); 74 static int str_to_event(const char *, int); 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(void) 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 out2fmt_flush("sh: can't initialize history\n"); 99 } 100 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ 101 /* 102 * turn editing on 103 */ 104 char *term; 105 106 INTOFF; 107 if (el_in == NULL) 108 el_in = fdopen(0, "r"); 109 if (el_out == NULL) 110 el_out = fdopen(2, "w"); 111 if (el_in == NULL || el_out == NULL) 112 goto bad; 113 term = lookupvar("TERM"); 114 if (term) 115 setenv("TERM", term, 1); 116 else 117 unsetenv("TERM"); 118 el = el_init(arg0, el_in, el_out, el_out); 119 if (el != NULL) { 120 if (hist) 121 el_set(el, EL_HIST, history, hist); 122 el_set(el, EL_PROMPT, getprompt); 123 el_set(el, EL_ADDFN, "sh-complete", 124 "Filename completion", 125 _el_fn_complete); 126 } else { 127 bad: 128 out2fmt_flush("sh: can't initialize editing\n"); 129 } 130 INTON; 131 } else if (!editing && el) { 132 INTOFF; 133 el_end(el); 134 el = NULL; 135 INTON; 136 } 137 if (el) { 138 if (Vflag) 139 el_set(el, EL_EDITOR, "vi"); 140 else if (Eflag) 141 el_set(el, EL_EDITOR, "emacs"); 142 el_set(el, EL_BIND, "^I", "sh-complete", NULL); 143 el_source(el, NULL); 144 } 145 } else { 146 INTOFF; 147 if (el) { /* no editing if not interactive */ 148 el_end(el); 149 el = NULL; 150 } 151 if (hist) { 152 history_end(hist); 153 hist = NULL; 154 } 155 INTON; 156 } 157 } 158 159 160 void 161 sethistsize(const char *hs) 162 { 163 int histsize; 164 HistEvent he; 165 166 if (hist != NULL) { 167 if (hs == NULL || !is_number(hs)) 168 histsize = 100; 169 else 170 histsize = atoi(hs); 171 history(hist, &he, H_SETSIZE, histsize); 172 history(hist, &he, H_SETUNIQUE, 1); 173 } 174 } 175 176 void 177 setterm(const char *term) 178 { 179 if (rootshell && el != NULL && term != NULL) 180 el_set(el, EL_TERMINAL, term); 181 } 182 183 int 184 histcmd(int argc, char **argv __unused) 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 = NULL; 194 static int active = 0; 195 struct jmploc jmploc; 196 struct jmploc *savehandler; 197 char editfilestr[PATH_MAX]; 198 char *volatile editfile; 199 FILE *efp = NULL; 200 int oldhistnum; 201 202 if (hist == NULL) 203 error("history not active"); 204 205 if (argc == 1) 206 error("missing history argument"); 207 208 while (not_fcnumber(*argptr) && (ch = nextopt("e:lnrs")) != '\0') 209 switch ((char)ch) { 210 case 'e': 211 editor = shoptarg; 212 break; 213 case 'l': 214 lflg = 1; 215 break; 216 case 'n': 217 nflg = 1; 218 break; 219 case 'r': 220 rflg = 1; 221 break; 222 case 's': 223 sflg = 1; 224 break; 225 } 226 227 savehandler = handler; 228 /* 229 * If executing... 230 */ 231 if (lflg == 0 || editor || sflg) { 232 lflg = 0; /* ignore */ 233 editfile = NULL; 234 /* 235 * Catch interrupts to reset active counter and 236 * cleanup temp files. 237 */ 238 if (setjmp(jmploc.loc)) { 239 active = 0; 240 if (editfile) 241 unlink(editfile); 242 handler = savehandler; 243 longjmp(handler->loc, 1); 244 } 245 handler = &jmploc; 246 if (++active > MAXHISTLOOPS) { 247 active = 0; 248 displayhist = 0; 249 error("called recursively too many times"); 250 } 251 /* 252 * Set editor. 253 */ 254 if (sflg == 0) { 255 if (editor == NULL && 256 (editor = bltinlookup("FCEDIT", 1)) == NULL && 257 (editor = bltinlookup("EDITOR", 1)) == NULL) 258 editor = DEFEDITOR; 259 if (editor[0] == '-' && editor[1] == '\0') { 260 sflg = 1; /* no edit */ 261 editor = NULL; 262 } 263 } 264 } 265 266 /* 267 * If executing, parse [old=new] now 268 */ 269 if (lflg == 0 && *argptr != NULL && 270 ((repl = strchr(*argptr, '=')) != NULL)) { 271 pat = *argptr; 272 *repl++ = '\0'; 273 argptr++; 274 } 275 /* 276 * determine [first] and [last] 277 */ 278 if (*argptr == NULL) { 279 firststr = lflg ? "-16" : "-1"; 280 laststr = "-1"; 281 } else if (argptr[1] == NULL) { 282 firststr = argptr[0]; 283 laststr = lflg ? "-1" : argptr[0]; 284 } else if (argptr[2] == NULL) { 285 firststr = argptr[0]; 286 laststr = argptr[1]; 287 } else 288 error("too many arguments"); 289 /* 290 * Turn into event numbers. 291 */ 292 first = str_to_event(firststr, 0); 293 last = str_to_event(laststr, 1); 294 295 if (rflg) { 296 i = last; 297 last = first; 298 first = i; 299 } 300 /* 301 * XXX - this should not depend on the event numbers 302 * always increasing. Add sequence numbers or offset 303 * to the history element in next (diskbased) release. 304 */ 305 direction = first < last ? H_PREV : H_NEXT; 306 307 /* 308 * If editing, grab a temp file. 309 */ 310 if (editor) { 311 int fd; 312 INTOFF; /* easier */ 313 sprintf(editfilestr, "%s/_shXXXXXX", _PATH_TMP); 314 if ((fd = mkstemp(editfilestr)) < 0) 315 error("can't create temporary file %s", editfile); 316 editfile = editfilestr; 317 if ((efp = fdopen(fd, "w")) == NULL) { 318 close(fd); 319 error("Out of space"); 320 } 321 } 322 323 /* 324 * Loop through selected history events. If listing or executing, 325 * do it now. Otherwise, put into temp file and call the editor 326 * after. 327 * 328 * The history interface needs rethinking, as the following 329 * convolutions will demonstrate. 330 */ 331 history(hist, &he, H_FIRST); 332 retval = history(hist, &he, H_NEXT_EVENT, first); 333 for (;retval != -1; retval = history(hist, &he, direction)) { 334 if (lflg) { 335 if (!nflg) 336 out1fmt("%5d ", he.num); 337 out1str(he.str); 338 } else { 339 const char *s = pat ? 340 fc_replace(he.str, pat, repl) : he.str; 341 342 if (sflg) { 343 if (displayhist) { 344 out2str(s); 345 flushout(out2); 346 } 347 evalstring(s, 0); 348 if (displayhist && hist) { 349 /* 350 * XXX what about recursive and 351 * relative histnums. 352 */ 353 oldhistnum = he.num; 354 history(hist, &he, H_ENTER, s); 355 /* 356 * XXX H_ENTER moves the internal 357 * cursor, set it back to the current 358 * entry. 359 */ 360 history(hist, &he, 361 H_NEXT_EVENT, oldhistnum); 362 } 363 } else 364 fputs(s, efp); 365 } 366 /* 367 * At end? (if we were to lose last, we'd sure be 368 * messed up). 369 */ 370 if (he.num == last) 371 break; 372 } 373 if (editor) { 374 char *editcmd; 375 376 fclose(efp); 377 INTON; 378 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 379 sprintf(editcmd, "%s %s", editor, editfile); 380 evalstring(editcmd, 0); /* XXX - should use no JC command */ 381 readcmdfile(editfile); /* XXX - should read back - quick tst */ 382 unlink(editfile); 383 } 384 385 if (lflg == 0 && active > 0) 386 --active; 387 if (displayhist) 388 displayhist = 0; 389 handler = savehandler; 390 return 0; 391 } 392 393 static char * 394 fc_replace(const char *s, char *p, char *r) 395 { 396 char *dest; 397 int plen = strlen(p); 398 399 STARTSTACKSTR(dest); 400 while (*s) { 401 if (*s == *p && strncmp(s, p, plen) == 0) { 402 STPUTS(r, dest); 403 s += plen; 404 *p = '\0'; /* so no more matches */ 405 } else 406 STPUTC(*s++, dest); 407 } 408 STPUTC('\0', dest); 409 dest = grabstackstr(dest); 410 411 return (dest); 412 } 413 414 static int 415 not_fcnumber(const char *s) 416 { 417 if (s == NULL) 418 return (0); 419 if (*s == '-') 420 s++; 421 return (!is_number(s)); 422 } 423 424 static int 425 str_to_event(const char *str, int last) 426 { 427 HistEvent he; 428 const char *s = str; 429 int relative = 0; 430 int i, retval; 431 432 retval = history(hist, &he, H_FIRST); 433 switch (*s) { 434 case '-': 435 relative = 1; 436 /*FALLTHROUGH*/ 437 case '+': 438 s++; 439 } 440 if (is_number(s)) { 441 i = atoi(s); 442 if (relative) { 443 while (retval != -1 && i--) { 444 retval = history(hist, &he, H_NEXT); 445 } 446 if (retval == -1) 447 retval = history(hist, &he, H_LAST); 448 } else { 449 retval = history(hist, &he, H_NEXT_EVENT, i); 450 if (retval == -1) { 451 /* 452 * the notion of first and last is 453 * backwards to that of the history package 454 */ 455 retval = history(hist, &he, last ? H_FIRST : H_LAST); 456 } 457 } 458 if (retval == -1) 459 error("history number %s not found (internal error)", 460 str); 461 } else { 462 /* 463 * pattern 464 */ 465 retval = history(hist, &he, H_PREV_STR, str); 466 if (retval == -1) 467 error("history pattern not found: %s", str); 468 } 469 return (he.num); 470 } 471 472 int 473 bindcmd(int argc, char **argv) 474 { 475 int ret; 476 FILE *old; 477 FILE *out; 478 479 if (el == NULL) 480 error("line editing is disabled"); 481 482 INTOFF; 483 484 out = out1fp(); 485 if (out == NULL) 486 error("Out of space"); 487 488 el_get(el, EL_GETFP, 1, &old); 489 el_set(el, EL_SETFP, 1, out); 490 491 ret = el_parse(el, argc, __DECONST(const char **, argv)); 492 493 el_set(el, EL_SETFP, 1, old); 494 495 fclose(out); 496 497 INTON; 498 499 return ret; 500 } 501 502 #else 503 #include "error.h" 504 505 int 506 histcmd(int argc __unused, char **argv __unused) 507 { 508 509 error("not compiled with history support"); 510 /*NOTREACHED*/ 511 return (0); 512 } 513 514 int 515 bindcmd(int argc __unused, char **argv __unused) 516 { 517 518 error("not compiled with line editing support"); 519 return (0); 520 } 521 #endif 522