1 /* $NetBSD: histedit.c,v 1.34 2003/10/27 06:19:29 lukem 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. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include <sys/cdefs.h>
36 #ifndef lint
37 #if 0
38 static char sccsid[] = "@(#)histedit.c 8.2 (Berkeley) 5/4/95";
39 #else
40 __RCSID("$NetBSD: histedit.c,v 1.34 2003/10/27 06:19:29 lukem Exp $");
41 #endif
42 #endif /* not lint */
43
44 #include <sys/param.h>
45 #include <paths.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <unistd.h>
49 /*
50 * Editline and history functions (and glue).
51 */
52 #include "shell.h"
53 #include "parser.h"
54 #include "var.h"
55 #include "options.h"
56 #include "main.h"
57 #include "output.h"
58 #include "mystring.h"
59 #include "myhistedit.h"
60 #include "error.h"
61 #ifndef SMALL
62 #include "eval.h"
63 #include "memalloc.h"
64
65 #define MAXHISTLOOPS 4 /* max recursions through fc */
66 #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */
67
68 History *hist; /* history cookie */
69 EditLine *el; /* editline cookie */
70 int displayhist;
71 static FILE *el_in, *el_out;
72
73 STATIC const char *fc_replace(const char *, char *, char *);
74
75 #ifdef DEBUG
76 extern FILE *tracefile;
77 #endif
78
79 /*
80 * Set history and editing status. Called whenever the status may
81 * have changed (figures out what to do).
82 */
83 void
histedit(void)84 histedit(void)
85 {
86 FILE *el_err;
87
88 #define editing (Eflag || Vflag)
89
90 if (iflag) {
91 if (!hist) {
92 /*
93 * turn history on
94 */
95 INTOFF;
96 hist = history_init();
97 INTON;
98
99 if (hist != NULL)
100 sethistsize(histsizeval());
101 else
102 out2str("sh: can't initialize history\n");
103 }
104 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
105 /*
106 * turn editing on
107 */
108 char *term, *shname;
109
110 INTOFF;
111 if (el_in == NULL)
112 el_in = fdopen(0, "r");
113 if (el_out == NULL)
114 el_out = fdopen(2, "w");
115 if (el_in == NULL || el_out == NULL)
116 goto bad;
117 el_err = el_out;
118 #if DEBUG
119 if (tracefile)
120 el_err = tracefile;
121 #endif
122 term = lookupvar("TERM");
123 if (term)
124 setenv("TERM", term, 1);
125 else
126 unsetenv("TERM");
127 shname = arg0;
128 if (shname[0] == '-')
129 shname++;
130 el = el_init(shname, el_in, el_out, el_err);
131 if (el != NULL) {
132 if (hist)
133 el_set(el, EL_HIST, history, hist);
134 el_set(el, EL_PROMPT, getprompt);
135 el_set(el, EL_SIGNAL, 1);
136 } else {
137 bad:
138 out2str("sh: can't initialize editing\n");
139 }
140 INTON;
141 } else if (!editing && el) {
142 INTOFF;
143 el_end(el);
144 el = NULL;
145 INTON;
146 }
147 if (el) {
148 if (Vflag)
149 el_set(el, EL_EDITOR, "vi");
150 else if (Eflag)
151 el_set(el, EL_EDITOR, "emacs");
152 el_source(el, NULL);
153 }
154 } else {
155 INTOFF;
156 if (el) { /* no editing if not interactive */
157 el_end(el);
158 el = NULL;
159 }
160 if (hist) {
161 history_end(hist);
162 hist = NULL;
163 }
164 INTON;
165 }
166 }
167
168
169 void
sethistsize(const char * hs)170 sethistsize(const char *hs)
171 {
172 int histsize;
173 HistEvent he;
174
175 if (hist != NULL) {
176 if (hs == NULL || *hs == '\0' ||
177 (histsize = atoi(hs)) < 0)
178 histsize = 100;
179 history(hist, &he, H_SETSIZE, histsize);
180 }
181 }
182
183 void
setterm(const char * term)184 setterm(const char *term)
185 {
186 if (el != NULL && term != NULL)
187 if (el_set(el, EL_TERMINAL, term) != 0) {
188 outfmt(out2, "sh: Can't set terminal type %s\n", term);
189 outfmt(out2, "sh: Using dumb terminal settings.\n");
190 }
191 }
192
193 int
inputrc(argc,argv)194 inputrc(argc, argv)
195 int argc;
196 char **argv;
197 {
198 if (argc != 2) {
199 out2str("usage: inputrc file\n");
200 return 1;
201 }
202 if (el != NULL) {
203 if (el_source(el, argv[1])) {
204 out2str("inputrc: failed\n");
205 return 1;
206 } else
207 return 0;
208 } else {
209 out2str("sh: inputrc ignored, not editing\n");
210 return 1;
211 }
212 }
213
214 /*
215 * This command is provided since POSIX decided to standardize
216 * the Korn shell fc command. Oh well...
217 */
218 int
histcmd(int argc,char ** argv)219 histcmd(int argc, char **argv)
220 {
221 int ch;
222 const char *editor = NULL;
223 HistEvent he;
224 int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
225 int i, retval;
226 const char *firststr, *laststr;
227 int first, last, direction;
228 char *pat = NULL, *repl; /* ksh "fc old=new" crap */
229 static int active = 0;
230 struct jmploc jmploc;
231 struct jmploc *volatile savehandler;
232 char editfile[MAXPATHLEN + 1];
233 FILE *efp;
234 #ifdef __GNUC__
235 /* Avoid longjmp clobbering */
236 (void) &editor;
237 (void) &lflg;
238 (void) &nflg;
239 (void) &rflg;
240 (void) &sflg;
241 (void) &firststr;
242 (void) &laststr;
243 (void) &pat;
244 (void) &repl;
245 (void) &efp;
246 (void) &argc;
247 (void) &argv;
248 #endif
249
250 if (hist == NULL)
251 error("history not active");
252
253 if (argc == 1)
254 error("missing history argument");
255
256 optreset = 1; optind = 1; /* initialize getopt */
257 while (not_fcnumber(argv[optind]) &&
258 (ch = getopt(argc, argv, ":e:lnrs")) != -1)
259 switch ((char)ch) {
260 case 'e':
261 editor = optionarg;
262 break;
263 case 'l':
264 lflg = 1;
265 break;
266 case 'n':
267 nflg = 1;
268 break;
269 case 'r':
270 rflg = 1;
271 break;
272 case 's':
273 sflg = 1;
274 break;
275 case ':':
276 error("option -%c expects argument", optopt);
277 /* NOTREACHED */
278 case '?':
279 default:
280 error("unknown option: -%c", optopt);
281 /* NOTREACHED */
282 }
283 argc -= optind, argv += optind;
284
285 /*
286 * If executing...
287 */
288 if (lflg == 0 || editor || sflg) {
289 lflg = 0; /* ignore */
290 editfile[0] = '\0';
291 /*
292 * Catch interrupts to reset active counter and
293 * cleanup temp files.
294 */
295 if (setjmp(jmploc.loc)) {
296 active = 0;
297 if (*editfile)
298 unlink(editfile);
299 handler = savehandler;
300 longjmp(handler->loc, 1);
301 }
302 savehandler = handler;
303 handler = &jmploc;
304 if (++active > MAXHISTLOOPS) {
305 active = 0;
306 displayhist = 0;
307 error("called recursively too many times");
308 }
309 /*
310 * Set editor.
311 */
312 if (sflg == 0) {
313 if (editor == NULL &&
314 (editor = bltinlookup("FCEDIT", 1)) == NULL &&
315 (editor = bltinlookup("EDITOR", 1)) == NULL)
316 editor = DEFEDITOR;
317 if (editor[0] == '-' && editor[1] == '\0') {
318 sflg = 1; /* no edit */
319 editor = NULL;
320 }
321 }
322 }
323
324 /*
325 * If executing, parse [old=new] now
326 */
327 if (lflg == 0 && argc > 0 &&
328 ((repl = strchr(argv[0], '=')) != NULL)) {
329 pat = argv[0];
330 *repl++ = '\0';
331 argc--, argv++;
332 }
333 /*
334 * determine [first] and [last]
335 */
336 switch (argc) {
337 case 0:
338 firststr = lflg ? "-16" : "-1";
339 laststr = "-1";
340 break;
341 case 1:
342 firststr = argv[0];
343 laststr = lflg ? "-1" : argv[0];
344 break;
345 case 2:
346 firststr = argv[0];
347 laststr = argv[1];
348 break;
349 default:
350 error("too many args");
351 /* NOTREACHED */
352 }
353 /*
354 * Turn into event numbers.
355 */
356 first = str_to_event(firststr, 0);
357 last = str_to_event(laststr, 1);
358
359 if (rflg) {
360 i = last;
361 last = first;
362 first = i;
363 }
364 /*
365 * XXX - this should not depend on the event numbers
366 * always increasing. Add sequence numbers or offset
367 * to the history element in next (diskbased) release.
368 */
369 direction = first < last ? H_PREV : H_NEXT;
370
371 /*
372 * If editing, grab a temp file.
373 */
374 if (editor) {
375 int fd;
376 INTOFF; /* easier */
377 snprintf(editfile, sizeof(editfile), "%s_shXXXXXX", _PATH_TMP);
378 if ((fd = mkstemp(editfile)) < 0)
379 error("can't create temporary file %s", editfile);
380 if ((efp = fdopen(fd, "w")) == NULL) {
381 close(fd);
382 error("can't allocate stdio buffer for temp");
383 }
384 }
385
386 /*
387 * Loop through selected history events. If listing or executing,
388 * do it now. Otherwise, put into temp file and call the editor
389 * after.
390 *
391 * The history interface needs rethinking, as the following
392 * convolutions will demonstrate.
393 */
394 history(hist, &he, H_FIRST);
395 retval = history(hist, &he, H_NEXT_EVENT, first);
396 for (;retval != -1; retval = history(hist, &he, direction)) {
397 if (lflg) {
398 if (!nflg)
399 out1fmt("%5d ", he.num);
400 out1str(he.str);
401 } else {
402 const char *s = pat ?
403 fc_replace(he.str, pat, repl) : he.str;
404
405 if (sflg) {
406 if (displayhist) {
407 out2str(s);
408 }
409
410 evalstring(strcpy(stalloc(strlen(s) + 1), s), 0);
411 if (displayhist && hist) {
412 /*
413 * XXX what about recursive and
414 * relative histnums.
415 */
416 history(hist, &he, H_ENTER, s);
417 }
418 } else
419 fputs(s, efp);
420 }
421 /*
422 * At end? (if we were to lose last, we'd sure be
423 * messed up).
424 */
425 if (he.num == last)
426 break;
427 }
428 if (editor) {
429 char *editcmd;
430
431 fclose(efp);
432 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
433 sprintf(editcmd, "%s %s", editor, editfile);
434 evalstring(editcmd, 0); /* XXX - should use no JC command */
435 INTON;
436 readcmdfile(editfile); /* XXX - should read back - quick tst */
437 unlink(editfile);
438 }
439
440 if (lflg == 0 && active > 0)
441 --active;
442 if (displayhist)
443 displayhist = 0;
444 return 0;
445 }
446
447 STATIC const char *
fc_replace(const char * s,char * p,char * r)448 fc_replace(const char *s, char *p, char *r)
449 {
450 char *dest;
451 int plen = strlen(p);
452
453 STARTSTACKSTR(dest);
454 while (*s) {
455 if (*s == *p && strncmp(s, p, plen) == 0) {
456 while (*r)
457 STPUTC(*r++, dest);
458 s += plen;
459 *p = '\0'; /* so no more matches */
460 } else
461 STPUTC(*s++, dest);
462 }
463 STACKSTRNUL(dest);
464 dest = grabstackstr(dest);
465
466 return (dest);
467 }
468
469 int
not_fcnumber(char * s)470 not_fcnumber(char *s)
471 {
472 if (s == NULL)
473 return 0;
474 if (*s == '-')
475 s++;
476 return (!is_number(s));
477 }
478
479 int
str_to_event(const char * str,int last)480 str_to_event(const char *str, int last)
481 {
482 HistEvent he;
483 const char *s = str;
484 int relative = 0;
485 int i, retval;
486
487 retval = history(hist, &he, H_FIRST);
488 switch (*s) {
489 case '-':
490 relative = 1;
491 /*FALLTHROUGH*/
492 case '+':
493 s++;
494 }
495 if (is_number(s)) {
496 i = atoi(s);
497 if (relative) {
498 while (retval != -1 && i--) {
499 retval = history(hist, &he, H_NEXT);
500 }
501 if (retval == -1)
502 retval = history(hist, &he, H_LAST);
503 } else {
504 retval = history(hist, &he, H_NEXT_EVENT, i);
505 if (retval == -1) {
506 /*
507 * the notion of first and last is
508 * backwards to that of the history package
509 */
510 retval = history(hist, &he,
511 last ? H_FIRST : H_LAST);
512 }
513 }
514 if (retval == -1)
515 error("history number %s not found (internal error)",
516 str);
517 } else {
518 /*
519 * pattern
520 */
521 retval = history(hist, &he, H_PREV_STR, str);
522 if (retval == -1)
523 error("history pattern not found: %s", str);
524 }
525 return (he.num);
526 }
527 #else
528 int
histcmd(int argc,char ** argv)529 histcmd(int argc, char **argv)
530 {
531 error("not compiled with history support");
532 /* NOTREACHED */
533 }
534 int
inputrc(int argc,char ** argv)535 inputrc(int argc, char **argv)
536 {
537 error("not compiled with history support");
538 /* NOTREACHED */
539 }
540 #endif
541