1 /* $NetBSD: histedit.c,v 1.10 1996/10/16 14:40:32 christos 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 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)histedit.c 8.2 (Berkeley) 5/4/95"; 42 #else 43 static char rcsid[] = "$NetBSD: histedit.c,v 1.10 1996/10/16 14:40:32 christos Exp $"; 44 #endif 45 #endif /* not lint */ 46 47 #include <sys/param.h> 48 #include <paths.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <unistd.h> 52 /* 53 * Editline and history functions (and glue). 54 */ 55 #include "shell.h" 56 #include "parser.h" 57 #include "var.h" 58 #include "options.h" 59 #include "main.h" 60 #include "output.h" 61 #include "mystring.h" 62 #ifndef NO_HISTORY 63 #include "myhistedit.h" 64 #endif 65 #include "error.h" 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 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); 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; 156 157 if (hist != NULL) { 158 if (hs == NULL || *hs == '\0' || 159 (histsize = atoi(hs)) < 0) 160 histsize = 100; 161 history(hist, H_EVENT, histsize); 162 } 163 } 164 165 /* 166 * This command is provided since POSIX decided to standardize 167 * the Korn shell fc command. Oh well... 168 */ 169 int 170 histcmd(argc, argv) 171 int argc; 172 char **argv; 173 { 174 extern char *optarg; 175 extern int optind, optopt, optreset; 176 int ch; 177 char *editor = NULL; 178 const HistEvent *he; 179 int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 180 int i; 181 char *firststr, *laststr; 182 int first, last, direction; 183 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 184 static int active = 0; 185 struct jmploc jmploc; 186 struct jmploc *volatile savehandler; 187 char editfile[MAXPATHLEN + 1]; 188 FILE *efp; 189 #ifdef __GNUC__ 190 /* Avoid longjmp clobbering */ 191 (void) &editor; 192 (void) &lflg; 193 (void) &nflg; 194 (void) &rflg; 195 (void) &sflg; 196 (void) &firststr; 197 (void) &laststr; 198 (void) &pat; 199 (void) &repl; 200 (void) &efp; 201 (void) &argc; 202 (void) &argv; 203 #endif 204 205 if (hist == NULL) 206 error("history not active"); 207 208 if (argc == 1) 209 error("missing history argument"); 210 211 optreset = 1; optind = 1; /* initialize getopt */ 212 while (not_fcnumber(argv[optind]) && 213 (ch = getopt(argc, argv, ":e:lnrs")) != EOF) 214 switch ((char)ch) { 215 case 'e': 216 editor = optarg; 217 break; 218 case 'l': 219 lflg = 1; 220 break; 221 case 'n': 222 nflg = 1; 223 break; 224 case 'r': 225 rflg = 1; 226 break; 227 case 's': 228 sflg = 1; 229 break; 230 case ':': 231 error("option -%c expects argument", optopt); 232 case '?': 233 default: 234 error("unknown option: -%c", optopt); 235 } 236 argc -= optind, argv += optind; 237 238 /* 239 * If executing... 240 */ 241 if (lflg == 0 || editor || sflg) { 242 lflg = 0; /* ignore */ 243 editfile[0] = '\0'; 244 /* 245 * Catch interrupts to reset active counter and 246 * cleanup temp files. 247 */ 248 if (setjmp(jmploc.loc)) { 249 active = 0; 250 if (*editfile) 251 unlink(editfile); 252 handler = savehandler; 253 longjmp(handler->loc, 1); 254 } 255 savehandler = handler; 256 handler = &jmploc; 257 if (++active > MAXHISTLOOPS) { 258 active = 0; 259 displayhist = 0; 260 error("called recursively too many times"); 261 } 262 /* 263 * Set editor. 264 */ 265 if (sflg == 0) { 266 if (editor == NULL && 267 (editor = bltinlookup("FCEDIT", 1)) == NULL && 268 (editor = bltinlookup("EDITOR", 1)) == NULL) 269 editor = DEFEDITOR; 270 if (editor[0] == '-' && editor[1] == '\0') { 271 sflg = 1; /* no edit */ 272 editor = NULL; 273 } 274 } 275 } 276 277 /* 278 * If executing, parse [old=new] now 279 */ 280 if (lflg == 0 && argc > 0 && 281 ((repl = strchr(argv[0], '=')) != NULL)) { 282 pat = argv[0]; 283 *repl++ = '\0'; 284 argc--, argv++; 285 } 286 /* 287 * determine [first] and [last] 288 */ 289 switch (argc) { 290 case 0: 291 firststr = lflg ? "-16" : "-1"; 292 laststr = "-1"; 293 break; 294 case 1: 295 firststr = argv[0]; 296 laststr = lflg ? "-1" : argv[0]; 297 break; 298 case 2: 299 firststr = argv[0]; 300 laststr = argv[1]; 301 break; 302 default: 303 error("too many args"); 304 } 305 /* 306 * Turn into event numbers. 307 */ 308 first = str_to_event(firststr, 0); 309 last = str_to_event(laststr, 1); 310 311 if (rflg) { 312 i = last; 313 last = first; 314 first = i; 315 } 316 /* 317 * XXX - this should not depend on the event numbers 318 * always increasing. Add sequence numbers or offset 319 * to the history element in next (diskbased) release. 320 */ 321 direction = first < last ? H_PREV : H_NEXT; 322 323 /* 324 * If editing, grab a temp file. 325 */ 326 if (editor) { 327 int fd; 328 INTOFF; /* easier */ 329 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); 330 if ((fd = mkstemp(editfile)) < 0) 331 error("can't create temporary file %s", editfile); 332 if ((efp = fdopen(fd, "w")) == NULL) { 333 close(fd); 334 error("can't allocate stdio buffer for temp"); 335 } 336 } 337 338 /* 339 * Loop through selected history events. If listing or executing, 340 * do it now. Otherwise, put into temp file and call the editor 341 * after. 342 * 343 * The history interface needs rethinking, as the following 344 * convolutions will demonstrate. 345 */ 346 history(hist, H_FIRST); 347 he = history(hist, H_NEXT_EVENT, first); 348 for (;he != NULL; he = history(hist, direction)) { 349 if (lflg) { 350 if (!nflg) 351 out1fmt("%5d ", he->num); 352 out1str(he->str); 353 } else { 354 char *s = pat ? 355 fc_replace(he->str, pat, repl) : (char *)he->str; 356 357 if (sflg) { 358 if (displayhist) { 359 out2str(s); 360 } 361 evalstring(s); 362 if (displayhist && hist) { 363 /* 364 * XXX what about recursive and 365 * relative histnums. 366 */ 367 history(hist, H_ENTER, s); 368 } 369 } else 370 fputs(s, efp); 371 } 372 /* 373 * At end? (if we were to loose last, we'd sure be 374 * messed up). 375 */ 376 if (he->num == last) 377 break; 378 } 379 if (editor) { 380 char *editcmd; 381 382 fclose(efp); 383 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 384 sprintf(editcmd, "%s %s", editor, editfile); 385 evalstring(editcmd); /* XXX - should use no JC command */ 386 INTON; 387 readcmdfile(editfile); /* XXX - should read back - quick tst */ 388 unlink(editfile); 389 } 390 391 if (lflg == 0 && active > 0) 392 --active; 393 if (displayhist) 394 displayhist = 0; 395 return 0; 396 } 397 398 STATIC char * 399 fc_replace(s, p, r) 400 const char *s; 401 char *p, *r; 402 { 403 char *dest; 404 int plen = strlen(p); 405 406 STARTSTACKSTR(dest); 407 while (*s) { 408 if (*s == *p && strncmp(s, p, plen) == 0) { 409 while (*r) 410 STPUTC(*r++, dest); 411 s += plen; 412 *p = '\0'; /* so no more matches */ 413 } else 414 STPUTC(*s++, dest); 415 } 416 STACKSTRNUL(dest); 417 dest = grabstackstr(dest); 418 419 return (dest); 420 } 421 422 int 423 not_fcnumber(s) 424 char *s; 425 { 426 if (s == NULL) 427 return 0; 428 if (*s == '-') 429 s++; 430 return (!is_number(s)); 431 } 432 433 int 434 str_to_event(str, last) 435 char *str; 436 int last; 437 { 438 const HistEvent *he; 439 char *s = str; 440 int relative = 0; 441 int i; 442 443 he = history(hist, H_FIRST); 444 switch (*s) { 445 case '-': 446 relative = 1; 447 /*FALLTHROUGH*/ 448 case '+': 449 s++; 450 } 451 if (is_number(s)) { 452 i = atoi(s); 453 if (relative) { 454 while (he != NULL && i--) { 455 he = history(hist, H_NEXT); 456 } 457 if (he == NULL) 458 he = history(hist, H_LAST); 459 } else { 460 he = history(hist, H_NEXT_EVENT, i); 461 if (he == NULL) { 462 /* 463 * the notion of first and last is 464 * backwards to that of the history package 465 */ 466 he = history(hist, last ? H_FIRST : H_LAST); 467 } 468 } 469 if (he == NULL) 470 error("history number %s not found (internal error)", 471 str); 472 } else { 473 /* 474 * pattern 475 */ 476 he = history(hist, H_PREV_STR, str); 477 if (he == NULL) 478 error("history pattern not found: %s", str); 479 } 480 return (he->num); 481 } 482