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