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 37 #ifndef lint 38 /*static char sccsid[] = "from: @(#)histedit.c 8.1 (Berkeley) 5/31/93";*/ 39 static char *rcsid = "$Id: histedit.c,v 1.5 1994/12/05 19:07:42 cgd Exp $"; 40 #endif /* not lint */ 41 42 /* 43 * Editline and history functions (and glue). 44 */ 45 #include <sys/param.h> 46 #include <paths.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <unistd.h> 50 #include "shell.h" 51 #include "parser.h" 52 #include "var.h" 53 #include "options.h" 54 #include "output.h" 55 #include "mystring.h" 56 #include "error.h" 57 #include "eval.h" 58 #include "histedit.h" 59 #include "memalloc.h" 60 #include "extern.h" 61 62 #define MAXHISTLOOPS 4 /* max recursions through fc */ 63 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ 64 65 History *hist; /* history cookie */ 66 EditLine *el; /* editline cookie */ 67 int displayhist; 68 static FILE *el_in, *el_out; 69 70 STATIC char *fc_replace __P((const char *, char *, char *)); 71 int not_fcnumber __P((char *)); 72 int str_to_event __P((char *, int)); 73 74 /* 75 * Set history and editing status. Called whenever the status may 76 * have changed (figures out what to do). 77 */ 78 void 79 histedit() 80 { 81 82 #define editing (Eflag || Vflag) 83 84 if (iflag) { 85 if (!hist) { 86 /* 87 * turn history on 88 */ 89 INTOFF; 90 hist = history_init(); 91 INTON; 92 93 if (hist != NULL) 94 sethistsize(); 95 else 96 out2str("sh: can't initialize history\n"); 97 } 98 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ 99 /* 100 * turn editing on 101 */ 102 INTOFF; 103 if (el_in == NULL) 104 el_in = fdopen(0, "r"); 105 if (el_out == NULL) 106 el_out = fdopen(2, "w"); 107 if (el_in == NULL || el_out == NULL) 108 goto bad; 109 el = el_init(arg0, el_in, el_out); 110 if (el != NULL) { 111 if (hist) 112 el_set(el, EL_HIST, history, hist); 113 el_set(el, EL_PROMPT, getprompt); 114 } else { 115 bad: 116 out2str("sh: can't initialize editing\n"); 117 } 118 INTON; 119 } else if (!editing && el) { 120 INTOFF; 121 el_end(el); 122 el = NULL; 123 INTON; 124 } 125 if (el) { 126 if (Vflag) 127 el_set(el, EL_EDITOR, "vi"); 128 else if (Eflag) 129 el_set(el, EL_EDITOR, "emacs"); 130 } 131 } else { 132 INTOFF; 133 if (el) { /* no editing if not interactive */ 134 el_end(el); 135 el = NULL; 136 } 137 if (hist) { 138 history_end(hist); 139 hist = NULL; 140 } 141 INTON; 142 } 143 } 144 145 146 void 147 sethistsize() { 148 char *cp; 149 int histsize; 150 151 if (hist != NULL) { 152 cp = lookupvar("HISTSIZE"); 153 if (cp == NULL || *cp == '\0' || 154 (histsize = atoi(cp)) < 0) 155 histsize = 100; 156 history(hist, H_EVENT, histsize); 157 } 158 } 159 160 /* 161 * This command is provided since POSIX decided to standardize 162 * the Korn shell fc command. Oh well... 163 */ 164 int 165 histcmd(argc, argv) 166 int argc; 167 char *argv[]; 168 { 169 extern char *optarg; 170 extern int optind, optopt, optreset; 171 int ch; 172 char *editor = NULL; 173 const HistEvent *he; 174 int lflg = 0, nflg = 0, rflg = 0, sflg = 0; 175 int i; 176 char *firststr, *laststr; 177 int first, last, direction; 178 char *pat = NULL, *repl; /* ksh "fc old=new" crap */ 179 static int active = 0; 180 struct jmploc jmploc; 181 struct jmploc *volatile savehandler; 182 char editfile[MAXPATHLEN + 1]; 183 FILE *efp; 184 185 if (hist == NULL) 186 error("history not active"); 187 188 if (argc == 1) 189 error("missing history argument"); 190 191 optreset = 1; optind = 1; /* initialize getopt */ 192 while (not_fcnumber(argv[optind]) && 193 (ch = getopt(argc, argv, ":e:lnrs")) != EOF) 194 switch ((char)ch) { 195 case 'e': 196 editor = optarg; 197 break; 198 case 'l': 199 lflg = 1; 200 break; 201 case 'n': 202 nflg = 1; 203 break; 204 case 'r': 205 rflg = 1; 206 break; 207 case 's': 208 sflg = 1; 209 break; 210 case ':': 211 error("option -%c expects argument", optopt); 212 case '?': 213 default: 214 error("unknown option: -%c", optopt); 215 } 216 argc -= optind, argv += optind; 217 218 /* 219 * If executing... 220 */ 221 if (lflg == 0 || editor || sflg) { 222 lflg = 0; /* ignore */ 223 editfile[0] = '\0'; 224 /* 225 * Catch interrupts to reset active counter and 226 * cleanup temp files. 227 */ 228 if (setjmp(jmploc.loc)) { 229 active = 0; 230 if (*editfile) 231 unlink(editfile); 232 handler = savehandler; 233 longjmp(handler->loc, 1); 234 } 235 savehandler = handler; 236 handler = &jmploc; 237 if (++active > MAXHISTLOOPS) { 238 active = 0; 239 displayhist = 0; 240 error("called recursively too many times"); 241 } 242 /* 243 * Set editor. 244 */ 245 if (sflg == 0) { 246 if (editor == NULL && 247 (editor = bltinlookup("FCEDIT", 1)) == NULL && 248 (editor = bltinlookup("EDITOR", 1)) == NULL) 249 editor = DEFEDITOR; 250 if (editor[0] == '-' && editor[1] == '\0') { 251 sflg = 1; /* no edit */ 252 editor = NULL; 253 } 254 } 255 } 256 257 /* 258 * If executing, parse [old=new] now 259 */ 260 if (lflg == 0 && argc > 0 && 261 ((repl = strchr(argv[0], '=')) != NULL)) { 262 pat = argv[0]; 263 *repl++ = '\0'; 264 argc--, argv++; 265 } 266 /* 267 * determine [first] and [last] 268 */ 269 switch (argc) { 270 case 0: 271 firststr = lflg ? "-16" : "-1"; 272 laststr = "-1"; 273 break; 274 case 1: 275 firststr = argv[0]; 276 laststr = lflg ? "-1" : argv[0]; 277 break; 278 case 2: 279 firststr = argv[0]; 280 laststr = argv[1]; 281 break; 282 default: 283 error("too many args"); 284 } 285 /* 286 * Turn into event numbers. 287 */ 288 first = str_to_event(firststr, 0); 289 last = str_to_event(laststr, 1); 290 291 if (rflg) { 292 i = last; 293 last = first; 294 first = i; 295 } 296 /* 297 * XXX - this should not depend on the event numbers 298 * always increasing. Add sequence numbers or offset 299 * to the history element in next (diskbased) release. 300 */ 301 direction = first < last ? H_PREV : H_NEXT; 302 303 /* 304 * If editing, grab a temp file. 305 */ 306 if (editor) { 307 int fd; 308 INTOFF; /* easier */ 309 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); 310 if ((fd = mkstemp(editfile)) < 0) 311 error("can't create temporary file %s", editfile); 312 if ((efp = fdopen(fd, "w")) == NULL) { 313 close(fd); 314 error("can't allocate stdio buffer for temp\n"); 315 } 316 } 317 318 /* 319 * Loop through selected history events. If listing or executing, 320 * do it now. Otherwise, put into temp file and call the editor 321 * after. 322 * 323 * The history interface needs rethinking, as the following 324 * convolutions will demonstrate. 325 */ 326 history(hist, H_FIRST); 327 he = history(hist, H_NEXT_EVENT, first); 328 for (;he != NULL; he = history(hist, direction)) { 329 if (lflg) { 330 if (!nflg) 331 out1fmt("%5d ", he->num); 332 out1str(he->str); 333 } else { 334 char *s = pat ? 335 fc_replace(he->str, pat, repl) : (char *)he->str; 336 337 if (sflg) { 338 if (displayhist) { 339 out2str(s); 340 } 341 evalstring(s); 342 if (displayhist && hist) { 343 /* 344 * XXX what about recursive and 345 * relative histnums. 346 */ 347 history(hist, H_ENTER, s); 348 } 349 } else 350 fputs(s, efp); 351 } 352 /* 353 * At end? (if we were to loose last, we'd sure be 354 * messed up). 355 */ 356 if (he->num == last) 357 break; 358 } 359 if (editor) { 360 char *editcmd; 361 362 fclose(efp); 363 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 364 sprintf(editcmd, "%s %s", editor, editfile); 365 evalstring(editcmd); /* XXX - should use no JC command */ 366 INTON; 367 readcmdfile(editfile); /* XXX - should read back - quick tst */ 368 unlink(editfile); 369 } 370 371 if (lflg == 0 && active > 0) 372 --active; 373 if (displayhist) 374 displayhist = 0; 375 } 376 377 STATIC char * 378 fc_replace(s, p, r) 379 const char *s; 380 char *p, *r; 381 { 382 char *dest; 383 int plen = strlen(p); 384 385 STARTSTACKSTR(dest); 386 while (*s) { 387 if (*s == *p && strncmp(s, p, plen) == 0) { 388 while (*r) 389 STPUTC(*r++, dest); 390 s += plen; 391 *p = '\0'; /* so no more matches */ 392 } else 393 STPUTC(*s++, dest); 394 } 395 STACKSTRNUL(dest); 396 dest = grabstackstr(dest); 397 398 return (dest); 399 } 400 401 int 402 not_fcnumber(s) 403 char *s; 404 { 405 if (*s == '-') 406 s++; 407 return (!is_number(s)); 408 } 409 410 int 411 str_to_event(str, last) 412 char *str; 413 int last; 414 { 415 const HistEvent *he; 416 char *s = str; 417 int relative = 0; 418 int i; 419 420 he = history(hist, H_FIRST); 421 switch (*s) { 422 case '-': 423 relative = 1; 424 /*FALLTHROUGH*/ 425 case '+': 426 s++; 427 } 428 if (is_number(s)) { 429 i = atoi(s); 430 if (relative) { 431 while (he != NULL && i--) { 432 he = history(hist, H_NEXT); 433 } 434 if (he == NULL) 435 he = history(hist, H_LAST); 436 } else { 437 he = history(hist, H_NEXT_EVENT, i); 438 if (he == NULL) { 439 /* 440 * the notion of first and last is 441 * backwards to that of the history package 442 */ 443 he = history(hist, last ? H_FIRST : H_LAST); 444 } 445 } 446 if (he == NULL) 447 error("history number %s not found (internal error)", 448 str); 449 } else { 450 /* 451 * pattern 452 */ 453 he = history(hist, H_PREV_STR, str); 454 if (he == NULL) 455 error("history pattern not found: %s", str); 456 } 457 return (he->num); 458 } 459