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 * @(#)histedit.c 8.2 (Berkeley) 5/4/95 33 * $FreeBSD: head/bin/sh/histedit.c 240541 2012-09-15 21:56:30Z jilles $ 34 */ 35 36 #include <sys/param.h> 37 #include <limits.h> 38 #include <paths.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 /* 43 * Editline and history functions (and glue). 44 */ 45 #include "shell.h" 46 #include "parser.h" 47 #include "var.h" 48 #include "options.h" 49 #include "main.h" 50 #include "output.h" 51 #include "mystring.h" 52 #include "myhistedit.h" 53 #ifndef NO_HISTORY 54 #include "error.h" 55 #include "eval.h" 56 #include "memalloc.h" 57 #include "builtins.h" 58 59 #define MAXHISTLOOPS 4 /* max recursions through fc */ 60 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ 61 62 History *hist; /* history cookie */ 63 EditLine *el; /* editline cookie */ 64 int displayhist; 65 static FILE *el_in, *el_out, *el_err; 66 67 static char *fc_replace(const char *, char *, char *); 68 static int not_fcnumber(const char *); 69 static int str_to_event(const char *, int); 70 71 /* 72 * Set history and editing status. Called whenever the status may 73 * have changed (figures out what to do). 74 */ 75 void 76 histedit(void) 77 { 78 79 #define editing (Eflag || Vflag) 80 81 if (iflag) { 82 if (!hist) { 83 /* 84 * turn history on 85 */ 86 INTOFF; 87 hist = history_init(); 88 INTON; 89 90 if (hist != NULL) 91 sethistsize(histsizeval()); 92 else 93 out2fmt_flush("sh: can't initialize history\n"); 94 } 95 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ 96 /* 97 * turn editing on 98 */ 99 char *term; 100 101 INTOFF; 102 if (el_in == NULL) 103 el_in = fdopen(0, "r"); 104 if (el_err == NULL) 105 el_err = fdopen(1, "w"); 106 if (el_out == NULL) 107 el_out = fdopen(2, "w"); 108 if (el_in == NULL || el_err == NULL || el_out == NULL) 109 goto bad; 110 term = lookupvar("TERM"); 111 if (term) { 112 if (setenv("TERM", term, 1) == -1) 113 error("setenv: cannot set TERM=1"); 114 } 115 else 116 unsetenv("TERM"); 117 el = el_init(arg0, el_in, el_out, el_err); 118 if (el != NULL) { 119 if (hist) 120 el_set(el, EL_HIST, history, hist); 121 el_set(el, EL_PROMPT, getprompt); 122 el_set(el, EL_ADDFN, "rl-complete", 123 "ReadLine compatible completion function", 124 _el_fn_complete); 125 } else { 126 bad: 127 out2fmt_flush("sh: can't initialize editing\n"); 128 } 129 INTON; 130 } else if (!editing && el) { 131 INTOFF; 132 el_end(el); 133 el = NULL; 134 INTON; 135 } 136 if (el) { 137 if (Vflag) 138 el_set(el, EL_EDITOR, "vi"); 139 else if (Eflag) 140 el_set(el, EL_EDITOR, "emacs"); 141 el_set(el, EL_BIND, "^I", 142 tabcomplete ? "rl-complete" : "ed-insert", 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 || *hs == '\0' || 168 (histsize = atoi(hs)) < 0) 169 histsize = 100; 170 history(hist, &he, H_SETSIZE, histsize); 171 history(hist, &he, H_SETUNIQUE, 1); 172 } 173 } 174 175 void 176 setterm(const char *term) 177 { 178 if (rootshell && el != NULL && term != NULL) 179 el_set(el, EL_TERMINAL, term); 180 } 181 182 int 183 histcmd(int argc, char **argv __unused) 184 { 185 int ch; 186 const char *volatile editor = NULL; 187 HistEvent he; 188 volatile int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 189 int i, retval; 190 const char *firststr = NULL, *laststr = NULL; 191 int first, last, direction; 192 char *pat = NULL, *repl = NULL; 193 static int active = 0; 194 struct jmploc jmploc; 195 struct jmploc *savehandler; 196 char editfilestr[PATH_MAX]; 197 char *volatile editfile; 198 FILE *efp = NULL; 199 int oldhistnum; 200 201 if (hist == NULL) 202 error("history not active"); 203 204 if (argc == 1) 205 error("missing history argument"); 206 207 while (not_fcnumber(*argptr) && (ch = nextopt("e:lnrs")) != '\0') 208 switch ((char)ch) { 209 case 'e': 210 editor = shoptarg; 211 break; 212 case 'l': 213 lflg = 1; 214 break; 215 case 'n': 216 nflg = 1; 217 break; 218 case 'r': 219 rflg = 1; 220 break; 221 case 's': 222 sflg = 1; 223 break; 224 } 225 226 savehandler = handler; 227 /* 228 * If executing... 229 */ 230 if (lflg == 0 || editor || sflg) { 231 lflg = 0; /* ignore */ 232 editfile = NULL; 233 /* 234 * Catch interrupts to reset active counter and 235 * cleanup temp files. 236 */ 237 if (setjmp(jmploc.loc)) { 238 active = 0; 239 if (editfile) 240 unlink(editfile); 241 handler = savehandler; 242 longjmp(handler->loc, 1); 243 } 244 handler = &jmploc; 245 if (++active > MAXHISTLOOPS) { 246 active = 0; 247 displayhist = 0; 248 error("called recursively too many times"); 249 } 250 /* 251 * Set editor. 252 */ 253 if (sflg == 0) { 254 if (editor == NULL && 255 (editor = bltinlookup("FCEDIT", 1)) == NULL && 256 (editor = bltinlookup("EDITOR", 1)) == NULL) 257 editor = DEFEDITOR; 258 if (editor[0] == '-' && editor[1] == '\0') { 259 sflg = 1; /* no edit */ 260 editor = NULL; 261 } 262 } 263 } 264 265 /* 266 * If executing, parse [old=new] now 267 */ 268 if (lflg == 0 && *argptr != NULL && 269 ((repl = strchr(*argptr, '=')) != NULL)) { 270 pat = *argptr; 271 *repl++ = '\0'; 272 argptr++; 273 } 274 /* 275 * determine [first] and [last] 276 */ 277 if (*argptr == NULL) { 278 firststr = lflg ? "-16" : "-1"; 279 laststr = "-1"; 280 } else if (argptr[1] == NULL) { 281 firststr = argptr[0]; 282 laststr = lflg ? "-1" : argptr[0]; 283 } else if (argptr[2] == NULL) { 284 firststr = argptr[0]; 285 laststr = argptr[1]; 286 } else 287 error("too many arguments"); 288 /* 289 * Turn into event numbers. 290 */ 291 first = str_to_event(firststr, 0); 292 last = str_to_event(laststr, 1); 293 294 if (rflg) { 295 i = last; 296 last = first; 297 first = i; 298 } 299 /* 300 * XXX - this should not depend on the event numbers 301 * always increasing. Add sequence numbers or offset 302 * to the history element in next (diskbased) release. 303 */ 304 direction = first < last ? H_PREV : H_NEXT; 305 306 /* 307 * If editing, grab a temp file. 308 */ 309 if (editor) { 310 int fd; 311 INTOFF; /* easier */ 312 sprintf(editfilestr, "%s/_shXXXXXX", _PATH_TMP); 313 if ((fd = mkstemp(editfilestr)) < 0) 314 error("can't create temporary file %s", editfile); 315 editfile = editfilestr; 316 if ((efp = fdopen(fd, "w")) == NULL) { 317 close(fd); 318 error("Out of space"); 319 } 320 } 321 322 /* 323 * Loop through selected history events. If listing or executing, 324 * do it now. Otherwise, put into temp file and call the editor 325 * after. 326 * 327 * The history interface needs rethinking, as the following 328 * convolutions will demonstrate. 329 */ 330 history(hist, &he, H_FIRST); 331 retval = history(hist, &he, H_NEXT_EVENT, first); 332 for (;retval != -1; retval = history(hist, &he, direction)) { 333 if (lflg) { 334 if (!nflg) 335 out1fmt("%5d ", he.num); 336 out1str(he.str); 337 } else { 338 char *s = pat ? 339 fc_replace(he.str, pat, repl) : 340 __DECONST(char *, 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 retval = 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 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 378 sprintf(editcmd, "%s %s", editor, editfile); 379 evalstring(editcmd, 0); /* XXX - should use no JC command */ 380 INTON; 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 { 475 476 if (el == NULL) 477 error("line editing is disabled"); 478 return (el_parse(el, argc, (const char **)argv)); 479 } 480 481 #else 482 #include "error.h" 483 484 int 485 histcmd(int argc __unused, char **argv __unused) 486 { 487 488 error("not compiled with history support"); 489 /*NOTREACHED*/ 490 return (0); 491 } 492 493 int 494 bindcmd(int argc __unused, char **argv __unused) 495 { 496 497 error("not compiled with line editing support"); 498 return (0); 499 } 500 #endif 501