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 * @(#)histedit.c 8.2 (Berkeley) 5/4/95 37 * $FreeBSD: head/bin/sh/histedit.c 240541 2012-09-15 21:56:30Z jilles $ 38 */ 39 40 #include <sys/param.h> 41 #include <limits.h> 42 #include <paths.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <unistd.h> 46 /* 47 * Editline and history functions (and glue). 48 */ 49 #include "shell.h" 50 #include "parser.h" 51 #include "var.h" 52 #include "options.h" 53 #include "main.h" 54 #include "output.h" 55 #include "mystring.h" 56 #include "myhistedit.h" 57 #ifndef NO_HISTORY 58 #include "error.h" 59 #include "eval.h" 60 #include "memalloc.h" 61 #include "builtins.h" 62 63 #define MAXHISTLOOPS 4 /* max recursions through fc */ 64 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ 65 66 History *hist; /* history cookie */ 67 EditLine *el; /* editline cookie */ 68 int displayhist; 69 static FILE *el_in, *el_out, *el_err; 70 71 static char *fc_replace(const char *, char *, char *); 72 static int not_fcnumber(const char *); 73 static int str_to_event(const char *, int); 74 75 /* 76 * Set history and editing status. Called whenever the status may 77 * have changed (figures out what to do). 78 */ 79 void 80 histedit(void) 81 { 82 83 #define editing (Eflag || Vflag) 84 85 if (iflag) { 86 if (!hist) { 87 /* 88 * turn history on 89 */ 90 INTOFF; 91 hist = history_init(); 92 INTON; 93 94 if (hist != NULL) 95 sethistsize(histsizeval()); 96 else 97 out2fmt_flush("sh: can't initialize history\n"); 98 } 99 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ 100 /* 101 * turn editing on 102 */ 103 char *term; 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 term = lookupvar("TERM"); 115 if (term) { 116 if (setenv("TERM", term, 1) == -1) 117 error("setenv: cannot set TERM=1"); 118 } 119 else 120 unsetenv("TERM"); 121 el = el_init(arg0, el_in, el_out, el_err); 122 if (el != NULL) { 123 if (hist) 124 el_set(el, EL_HIST, history, hist); 125 el_set(el, EL_PROMPT, getprompt); 126 el_set(el, EL_ADDFN, "rl-complete", 127 "ReadLine compatible completion function", 128 _el_fn_complete); 129 } else { 130 bad: 131 out2fmt_flush("sh: can't initialize editing\n"); 132 } 133 INTON; 134 } else if (!editing && el) { 135 INTOFF; 136 el_end(el); 137 el = NULL; 138 INTON; 139 } 140 if (el) { 141 if (Vflag) 142 el_set(el, EL_EDITOR, "vi"); 143 else if (Eflag) 144 el_set(el, EL_EDITOR, "emacs"); 145 el_set(el, EL_BIND, "^I", 146 tabcomplete ? "rl-complete" : "ed-insert", NULL); 147 el_source(el, NULL); 148 } 149 } else { 150 INTOFF; 151 if (el) { /* no editing if not interactive */ 152 el_end(el); 153 el = NULL; 154 } 155 if (hist) { 156 history_end(hist); 157 hist = NULL; 158 } 159 INTON; 160 } 161 } 162 163 164 void 165 sethistsize(const char *hs) 166 { 167 int histsize; 168 HistEvent he; 169 170 if (hist != NULL) { 171 if (hs == NULL || *hs == '\0' || 172 (histsize = atoi(hs)) < 0) 173 histsize = 100; 174 history(hist, &he, H_SETSIZE, histsize); 175 history(hist, &he, H_SETUNIQUE, 1); 176 } 177 } 178 179 void 180 setterm(const char *term) 181 { 182 if (rootshell && el != NULL && term != NULL) 183 el_set(el, EL_TERMINAL, term); 184 } 185 186 int 187 histcmd(int argc, char **argv __unused) 188 { 189 int ch; 190 const char *volatile editor = NULL; 191 HistEvent he; 192 volatile int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 193 int i, retval; 194 const char *firststr = NULL, *laststr = NULL; 195 int first, last, direction; 196 char *pat = NULL, *repl = NULL; 197 static int active = 0; 198 struct jmploc jmploc; 199 struct jmploc *savehandler; 200 char editfilestr[PATH_MAX]; 201 char *volatile editfile; 202 FILE *efp = NULL; 203 int oldhistnum; 204 205 if (hist == NULL) 206 error("history not active"); 207 208 if (argc == 1) 209 error("missing history argument"); 210 211 while (not_fcnumber(*argptr) && (ch = nextopt("e:lnrs")) != '\0') 212 switch ((char)ch) { 213 case 'e': 214 editor = shoptarg; 215 break; 216 case 'l': 217 lflg = 1; 218 break; 219 case 'n': 220 nflg = 1; 221 break; 222 case 'r': 223 rflg = 1; 224 break; 225 case 's': 226 sflg = 1; 227 break; 228 } 229 230 savehandler = handler; 231 /* 232 * If executing... 233 */ 234 if (lflg == 0 || editor || sflg) { 235 lflg = 0; /* ignore */ 236 editfile = NULL; 237 /* 238 * Catch interrupts to reset active counter and 239 * cleanup temp files. 240 */ 241 if (setjmp(jmploc.loc)) { 242 active = 0; 243 if (editfile) 244 unlink(editfile); 245 handler = savehandler; 246 longjmp(handler->loc, 1); 247 } 248 handler = &jmploc; 249 if (++active > MAXHISTLOOPS) { 250 active = 0; 251 displayhist = 0; 252 error("called recursively too many times"); 253 } 254 /* 255 * Set editor. 256 */ 257 if (sflg == 0) { 258 if (editor == NULL && 259 (editor = bltinlookup("FCEDIT", 1)) == NULL && 260 (editor = bltinlookup("EDITOR", 1)) == NULL) 261 editor = DEFEDITOR; 262 if (editor[0] == '-' && editor[1] == '\0') { 263 sflg = 1; /* no edit */ 264 editor = NULL; 265 } 266 } 267 } 268 269 /* 270 * If executing, parse [old=new] now 271 */ 272 if (lflg == 0 && *argptr != NULL && 273 ((repl = strchr(*argptr, '=')) != NULL)) { 274 pat = *argptr; 275 *repl++ = '\0'; 276 argptr++; 277 } 278 /* 279 * determine [first] and [last] 280 */ 281 if (*argptr == NULL) { 282 firststr = lflg ? "-16" : "-1"; 283 laststr = "-1"; 284 } else if (argptr[1] == NULL) { 285 firststr = argptr[0]; 286 laststr = lflg ? "-1" : argptr[0]; 287 } else if (argptr[2] == NULL) { 288 firststr = argptr[0]; 289 laststr = argptr[1]; 290 } else 291 error("too many arguments"); 292 /* 293 * Turn into event numbers. 294 */ 295 first = str_to_event(firststr, 0); 296 last = str_to_event(laststr, 1); 297 298 if (rflg) { 299 i = last; 300 last = first; 301 first = i; 302 } 303 /* 304 * XXX - this should not depend on the event numbers 305 * always increasing. Add sequence numbers or offset 306 * to the history element in next (diskbased) release. 307 */ 308 direction = first < last ? H_PREV : H_NEXT; 309 310 /* 311 * If editing, grab a temp file. 312 */ 313 if (editor) { 314 int fd; 315 INTOFF; /* easier */ 316 sprintf(editfilestr, "%s/_shXXXXXX", _PATH_TMP); 317 if ((fd = mkstemp(editfilestr)) < 0) 318 error("can't create temporary file %s", editfile); 319 editfile = editfilestr; 320 if ((efp = fdopen(fd, "w")) == NULL) { 321 close(fd); 322 error("Out of space"); 323 } 324 } 325 326 /* 327 * Loop through selected history events. If listing or executing, 328 * do it now. Otherwise, put into temp file and call the editor 329 * after. 330 * 331 * The history interface needs rethinking, as the following 332 * convolutions will demonstrate. 333 */ 334 history(hist, &he, H_FIRST); 335 retval = history(hist, &he, H_NEXT_EVENT, first); 336 for (;retval != -1; retval = history(hist, &he, direction)) { 337 if (lflg) { 338 if (!nflg) 339 out1fmt("%5d ", he.num); 340 out1str(he.str); 341 } else { 342 char *s = pat ? 343 fc_replace(he.str, pat, repl) : 344 __DECONST(char *, he.str); 345 346 if (sflg) { 347 if (displayhist) { 348 out2str(s); 349 flushout(out2); 350 } 351 evalstring(s, 0); 352 if (displayhist && hist) { 353 /* 354 * XXX what about recursive and 355 * relative histnums. 356 */ 357 oldhistnum = he.num; 358 history(hist, &he, H_ENTER, s); 359 /* 360 * XXX H_ENTER moves the internal 361 * cursor, set it back to the current 362 * entry. 363 */ 364 retval = history(hist, &he, 365 H_NEXT_EVENT, oldhistnum); 366 } 367 } else 368 fputs(s, efp); 369 } 370 /* 371 * At end? (if we were to lose last, we'd sure be 372 * messed up). 373 */ 374 if (he.num == last) 375 break; 376 } 377 if (editor) { 378 char *editcmd; 379 380 fclose(efp); 381 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 382 sprintf(editcmd, "%s %s", editor, editfile); 383 evalstring(editcmd, 0); /* XXX - should use no JC command */ 384 INTON; 385 readcmdfile(editfile); /* XXX - should read back - quick tst */ 386 unlink(editfile); 387 } 388 389 if (lflg == 0 && active > 0) 390 --active; 391 if (displayhist) 392 displayhist = 0; 393 handler = savehandler; 394 return 0; 395 } 396 397 static char * 398 fc_replace(const char *s, char *p, char *r) 399 { 400 char *dest; 401 int plen = strlen(p); 402 403 STARTSTACKSTR(dest); 404 while (*s) { 405 if (*s == *p && strncmp(s, p, plen) == 0) { 406 STPUTS(r, dest); 407 s += plen; 408 *p = '\0'; /* so no more matches */ 409 } else 410 STPUTC(*s++, dest); 411 } 412 STPUTC('\0', dest); 413 dest = grabstackstr(dest); 414 415 return (dest); 416 } 417 418 static int 419 not_fcnumber(const char *s) 420 { 421 if (s == NULL) 422 return (0); 423 if (*s == '-') 424 s++; 425 return (!is_number(s)); 426 } 427 428 static int 429 str_to_event(const char *str, int last) 430 { 431 HistEvent he; 432 const char *s = str; 433 int relative = 0; 434 int i, retval; 435 436 retval = history(hist, &he, H_FIRST); 437 switch (*s) { 438 case '-': 439 relative = 1; 440 /*FALLTHROUGH*/ 441 case '+': 442 s++; 443 } 444 if (is_number(s)) { 445 i = atoi(s); 446 if (relative) { 447 while (retval != -1 && i--) { 448 retval = history(hist, &he, H_NEXT); 449 } 450 if (retval == -1) 451 retval = history(hist, &he, H_LAST); 452 } else { 453 retval = history(hist, &he, H_NEXT_EVENT, i); 454 if (retval == -1) { 455 /* 456 * the notion of first and last is 457 * backwards to that of the history package 458 */ 459 retval = history(hist, &he, last ? H_FIRST : H_LAST); 460 } 461 } 462 if (retval == -1) 463 error("history number %s not found (internal error)", 464 str); 465 } else { 466 /* 467 * pattern 468 */ 469 retval = history(hist, &he, H_PREV_STR, str); 470 if (retval == -1) 471 error("history pattern not found: %s", str); 472 } 473 return (he.num); 474 } 475 476 int 477 bindcmd(int argc, char **argv) 478 { 479 480 if (el == NULL) 481 error("line editing is disabled"); 482 return (el_parse(el, argc, (const char **)argv)); 483 } 484 485 #else 486 #include "error.h" 487 488 int 489 histcmd(int argc __unused, char **argv __unused) 490 { 491 492 error("not compiled with history support"); 493 /*NOTREACHED*/ 494 return (0); 495 } 496 497 int 498 bindcmd(int argc __unused, char **argv __unused) 499 { 500 501 error("not compiled with line editing support"); 502 return (0); 503 } 504 #endif 505