1 /* $NetBSD: histedit.c,v 1.7 1995/03/31 21:58:13 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 8.1 (Berkeley) 5/31/93"; 42 #else 43 static char rcsid[] = "$NetBSD: histedit.c,v 1.7 1995/03/31 21:58:13 christos Exp $"; 44 #endif 45 #endif /* not lint */ 46 47 /* 48 * Editline and history functions (and glue). 49 */ 50 #include <sys/param.h> 51 #include <paths.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <unistd.h> 55 #include "shell.h" 56 #include "parser.h" 57 #include "var.h" 58 #include "options.h" 59 #include "output.h" 60 #include "mystring.h" 61 #include "error.h" 62 #include "eval.h" 63 #include "histedit.h" 64 #include "memalloc.h" 65 #include "extern.h" 66 67 #define MAXHISTLOOPS 4 /* max recursions through fc */ 68 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ 69 70 History *hist; /* history cookie */ 71 EditLine *el; /* editline cookie */ 72 int displayhist; 73 static FILE *el_in, *el_out; 74 75 STATIC char *fc_replace __P((const char *, char *, char *)); 76 int not_fcnumber __P((char *)); 77 int str_to_event __P((char *, int)); 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(); 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() { 153 char *cp; 154 int histsize; 155 156 if (hist != NULL) { 157 cp = lookupvar("HISTSIZE"); 158 if (cp == NULL || *cp == '\0' || 159 (histsize = atoi(cp)) < 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; 189 190 if (hist == NULL) 191 error("history not active"); 192 193 if (argc == 1) 194 error("missing history argument"); 195 196 optreset = 1; optind = 1; /* initialize getopt */ 197 while (not_fcnumber(argv[optind]) && 198 (ch = getopt(argc, argv, ":e:lnrs")) != EOF) 199 switch ((char)ch) { 200 case 'e': 201 editor = optarg; 202 break; 203 case 'l': 204 lflg = 1; 205 break; 206 case 'n': 207 nflg = 1; 208 break; 209 case 'r': 210 rflg = 1; 211 break; 212 case 's': 213 sflg = 1; 214 break; 215 case ':': 216 error("option -%c expects argument", optopt); 217 case '?': 218 default: 219 error("unknown option: -%c", optopt); 220 } 221 argc -= optind, argv += optind; 222 223 /* 224 * If executing... 225 */ 226 if (lflg == 0 || editor || sflg) { 227 lflg = 0; /* ignore */ 228 editfile[0] = '\0'; 229 /* 230 * Catch interrupts to reset active counter and 231 * cleanup temp files. 232 */ 233 if (setjmp(jmploc.loc)) { 234 active = 0; 235 if (*editfile) 236 unlink(editfile); 237 handler = savehandler; 238 longjmp(handler->loc, 1); 239 } 240 savehandler = handler; 241 handler = &jmploc; 242 if (++active > MAXHISTLOOPS) { 243 active = 0; 244 displayhist = 0; 245 error("called recursively too many times"); 246 } 247 /* 248 * Set editor. 249 */ 250 if (sflg == 0) { 251 if (editor == NULL && 252 (editor = bltinlookup("FCEDIT", 1)) == NULL && 253 (editor = bltinlookup("EDITOR", 1)) == NULL) 254 editor = DEFEDITOR; 255 if (editor[0] == '-' && editor[1] == '\0') { 256 sflg = 1; /* no edit */ 257 editor = NULL; 258 } 259 } 260 } 261 262 /* 263 * If executing, parse [old=new] now 264 */ 265 if (lflg == 0 && argc > 0 && 266 ((repl = strchr(argv[0], '=')) != NULL)) { 267 pat = argv[0]; 268 *repl++ = '\0'; 269 argc--, argv++; 270 } 271 /* 272 * determine [first] and [last] 273 */ 274 switch (argc) { 275 case 0: 276 firststr = lflg ? "-16" : "-1"; 277 laststr = "-1"; 278 break; 279 case 1: 280 firststr = argv[0]; 281 laststr = lflg ? "-1" : argv[0]; 282 break; 283 case 2: 284 firststr = argv[0]; 285 laststr = argv[1]; 286 break; 287 default: 288 error("too many args"); 289 } 290 /* 291 * Turn into event numbers. 292 */ 293 first = str_to_event(firststr, 0); 294 last = str_to_event(laststr, 1); 295 296 if (rflg) { 297 i = last; 298 last = first; 299 first = i; 300 } 301 /* 302 * XXX - this should not depend on the event numbers 303 * always increasing. Add sequence numbers or offset 304 * to the history element in next (diskbased) release. 305 */ 306 direction = first < last ? H_PREV : H_NEXT; 307 308 /* 309 * If editing, grab a temp file. 310 */ 311 if (editor) { 312 int fd; 313 INTOFF; /* easier */ 314 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); 315 if ((fd = mkstemp(editfile)) < 0) 316 error("can't create temporary file %s", editfile); 317 if ((efp = fdopen(fd, "w")) == NULL) { 318 close(fd); 319 error("can't allocate stdio buffer for temp\n"); 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, H_FIRST); 332 he = history(hist, H_NEXT_EVENT, first); 333 for (;he != NULL; he = history(hist, direction)) { 334 if (lflg) { 335 if (!nflg) 336 out1fmt("%5d ", he->num); 337 out1str(he->str); 338 } else { 339 char *s = pat ? 340 fc_replace(he->str, pat, repl) : (char *)he->str; 341 342 if (sflg) { 343 if (displayhist) { 344 out2str(s); 345 } 346 evalstring(s); 347 if (displayhist && hist) { 348 /* 349 * XXX what about recursive and 350 * relative histnums. 351 */ 352 history(hist, H_ENTER, s); 353 } 354 } else 355 fputs(s, efp); 356 } 357 /* 358 * At end? (if we were to loose last, we'd sure be 359 * messed up). 360 */ 361 if (he->num == last) 362 break; 363 } 364 if (editor) { 365 char *editcmd; 366 367 fclose(efp); 368 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 369 sprintf(editcmd, "%s %s", editor, editfile); 370 evalstring(editcmd); /* XXX - should use no JC command */ 371 INTON; 372 readcmdfile(editfile); /* XXX - should read back - quick tst */ 373 unlink(editfile); 374 } 375 376 if (lflg == 0 && active > 0) 377 --active; 378 if (displayhist) 379 displayhist = 0; 380 } 381 382 STATIC char * 383 fc_replace(s, p, r) 384 const char *s; 385 char *p, *r; 386 { 387 char *dest; 388 int plen = strlen(p); 389 390 STARTSTACKSTR(dest); 391 while (*s) { 392 if (*s == *p && strncmp(s, p, plen) == 0) { 393 while (*r) 394 STPUTC(*r++, dest); 395 s += plen; 396 *p = '\0'; /* so no more matches */ 397 } else 398 STPUTC(*s++, dest); 399 } 400 STACKSTRNUL(dest); 401 dest = grabstackstr(dest); 402 403 return (dest); 404 } 405 406 int 407 not_fcnumber(s) 408 char *s; 409 { 410 if (s == NULL) 411 return 0; 412 if (*s == '-') 413 s++; 414 return (!is_number(s)); 415 } 416 417 int 418 str_to_event(str, last) 419 char *str; 420 int last; 421 { 422 const HistEvent *he; 423 char *s = str; 424 int relative = 0; 425 int i; 426 427 he = history(hist, H_FIRST); 428 switch (*s) { 429 case '-': 430 relative = 1; 431 /*FALLTHROUGH*/ 432 case '+': 433 s++; 434 } 435 if (is_number(s)) { 436 i = atoi(s); 437 if (relative) { 438 while (he != NULL && i--) { 439 he = history(hist, H_NEXT); 440 } 441 if (he == NULL) 442 he = history(hist, H_LAST); 443 } else { 444 he = history(hist, H_NEXT_EVENT, i); 445 if (he == NULL) { 446 /* 447 * the notion of first and last is 448 * backwards to that of the history package 449 */ 450 he = history(hist, last ? H_FIRST : H_LAST); 451 } 452 } 453 if (he == NULL) 454 error("history number %s not found (internal error)", 455 str); 456 } else { 457 /* 458 * pattern 459 */ 460 he = history(hist, H_PREV_STR, str); 461 if (he == NULL) 462 error("history pattern not found: %s", str); 463 } 464 return (he->num); 465 } 466