ifconfig(8): Group addresses of each interface by family
[dragonfly.git] / bin / sh / histedit.c
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. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)histedit.c  8.2 (Berkeley) 5/4/95";
36 #endif
37 #endif /* not lint */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40
41 #include <sys/param.h>
42 #include <limits.h>
43 #include <paths.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <unistd.h>
47 /*
48  * Editline and history functions (and glue).
49  */
50 #include "shell.h"
51 #include "parser.h"
52 #include "var.h"
53 #include "options.h"
54 #include "main.h"
55 #include "output.h"
56 #include "mystring.h"
57 #ifndef NO_HISTORY
58 #include "myhistedit.h"
59 #endif
60 #include "error.h"
61 #include "eval.h"
62 #include "memalloc.h"
63 #include "builtins.h"
64
65 #ifndef NO_HISTORY
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, *el_err;
74
75 static char *fc_replace(const char *, char *, char *);
76 static int not_fcnumber(const char *);
77 static int str_to_event(const 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(void)
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                                 out2fmt_flush("sh: can't initialize history\n");
102                 }
103                 if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
104                         /*
105                          * turn editing on
106                          */
107                         char *term;
108
109                         INTOFF;
110                         if (el_in == NULL)
111                                 el_in = fdopen(0, "r");
112                         if (el_err == NULL)
113                                 el_err = fdopen(1, "w");
114                         if (el_out == NULL)
115                                 el_out = fdopen(2, "w");
116                         if (el_in == NULL || el_err == NULL || el_out == NULL)
117                                 goto bad;
118                         term = lookupvar("TERM");
119                         if (term)
120                                 setenv("TERM", term, 1);
121                         else
122                                 unsetenv("TERM");
123                         el = el_init(arg0, el_in, el_out, el_err);
124                         if (el != NULL) {
125                                 if (hist)
126                                         el_set(el, EL_HIST, history, hist);
127                                 el_set(el, EL_PROMPT, getprompt);
128                                 el_set(el, EL_ADDFN, "sh-complete",
129                                     "Filename completion",
130                                     _el_fn_complete);
131                         } else {
132 bad:
133                                 out2fmt_flush("sh: can't initialize editing\n");
134                         }
135                         INTON;
136                 } else if (!editing && el) {
137                         INTOFF;
138                         el_end(el);
139                         el = NULL;
140                         INTON;
141                 }
142                 if (el) {
143                         if (Vflag)
144                                 el_set(el, EL_EDITOR, "vi");
145                         else if (Eflag)
146                                 el_set(el, EL_EDITOR, "emacs");
147                         el_set(el, EL_BIND, "^I", "sh-complete", NULL);
148                         el_source(el, NULL);
149                 }
150         } else {
151                 INTOFF;
152                 if (el) {       /* no editing if not interactive */
153                         el_end(el);
154                         el = NULL;
155                 }
156                 if (hist) {
157                         history_end(hist);
158                         hist = NULL;
159                 }
160                 INTON;
161         }
162 }
163
164
165 void
166 sethistsize(const char *hs)
167 {
168         int histsize;
169         HistEvent he;
170
171         if (hist != NULL) {
172                 if (hs == NULL || !is_number(hs))
173                         histsize = 100;
174                 else
175                         histsize = atoi(hs);
176                 history(hist, &he, H_SETSIZE, histsize);
177                 history(hist, &he, H_SETUNIQUE, 1);
178         }
179 }
180
181 void
182 setterm(const char *term)
183 {
184         if (rootshell && el != NULL && term != NULL)
185                 el_set(el, EL_TERMINAL, term);
186 }
187
188 int
189 histcmd(int argc, char **argv __unused)
190 {
191         int ch;
192         const char *editor = NULL;
193         HistEvent he;
194         int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
195         int i, retval;
196         const char *firststr, *laststr;
197         int first, last, direction;
198         char *pat = NULL, *repl = NULL;
199         static int active = 0;
200         struct jmploc jmploc;
201         struct jmploc *savehandler;
202         char editfilestr[PATH_MAX];
203         char *volatile editfile;
204         FILE *efp = NULL;
205         int oldhistnum;
206
207         if (hist == NULL)
208                 error("history not active");
209
210         if (argc == 1)
211                 error("missing history argument");
212
213         while (not_fcnumber(*argptr) && (ch = nextopt("e:lnrs")) != '\0')
214                 switch ((char)ch) {
215                 case 'e':
216                         editor = shoptarg;
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                 }
231
232         savehandler = handler;
233         /*
234          * If executing...
235          */
236         if (lflg == 0 || editor || sflg) {
237                 lflg = 0;       /* ignore */
238                 editfile = NULL;
239                 /*
240                  * Catch interrupts to reset active counter and
241                  * cleanup temp files.
242                  */
243                 if (setjmp(jmploc.loc)) {
244                         active = 0;
245                         if (editfile)
246                                 unlink(editfile);
247                         handler = savehandler;
248                         longjmp(handler->loc, 1);
249                 }
250                 handler = &jmploc;
251                 if (++active > MAXHISTLOOPS) {
252                         active = 0;
253                         displayhist = 0;
254                         error("called recursively too many times");
255                 }
256                 /*
257                  * Set editor.
258                  */
259                 if (sflg == 0) {
260                         if (editor == NULL &&
261                             (editor = bltinlookup("FCEDIT", 1)) == NULL &&
262                             (editor = bltinlookup("EDITOR", 1)) == NULL)
263                                 editor = DEFEDITOR;
264                         if (editor[0] == '-' && editor[1] == '\0') {
265                                 sflg = 1;       /* no edit */
266                                 editor = NULL;
267                         }
268                 }
269         }
270
271         /*
272          * If executing, parse [old=new] now
273          */
274         if (lflg == 0 && *argptr != NULL &&
275              ((repl = strchr(*argptr, '=')) != NULL)) {
276                 pat = *argptr;
277                 *repl++ = '\0';
278                 argptr++;
279         }
280         /*
281          * determine [first] and [last]
282          */
283         if (*argptr == NULL) {
284                 firststr = lflg ? "-16" : "-1";
285                 laststr = "-1";
286         } else if (argptr[1] == NULL) {
287                 firststr = argptr[0];
288                 laststr = lflg ? "-1" : argptr[0];
289         } else if (argptr[2] == NULL) {
290                 firststr = argptr[0];
291                 laststr = argptr[1];
292         } else
293                 error("too many arguments");
294         /*
295          * Turn into event numbers.
296          */
297         first = str_to_event(firststr, 0);
298         last = str_to_event(laststr, 1);
299
300         if (rflg) {
301                 i = last;
302                 last = first;
303                 first = i;
304         }
305         /*
306          * XXX - this should not depend on the event numbers
307          * always increasing.  Add sequence numbers or offset
308          * to the history element in next (diskbased) release.
309          */
310         direction = first < last ? H_PREV : H_NEXT;
311
312         /*
313          * If editing, grab a temp file.
314          */
315         if (editor) {
316                 int fd;
317                 INTOFF;         /* easier */
318                 sprintf(editfilestr, "%s/_shXXXXXX", _PATH_TMP);
319                 if ((fd = mkstemp(editfilestr)) < 0)
320                         error("can't create temporary file %s", editfile);
321                 editfile = editfilestr;
322                 if ((efp = fdopen(fd, "w")) == NULL) {
323                         close(fd);
324                         error("Out of space");
325                 }
326         }
327
328         /*
329          * Loop through selected history events.  If listing or executing,
330          * do it now.  Otherwise, put into temp file and call the editor
331          * after.
332          *
333          * The history interface needs rethinking, as the following
334          * convolutions will demonstrate.
335          */
336         history(hist, &he, H_FIRST);
337         retval = history(hist, &he, H_NEXT_EVENT, first);
338         for (;retval != -1; retval = history(hist, &he, direction)) {
339                 if (lflg) {
340                         if (!nflg)
341                                 out1fmt("%5d ", he.num);
342                         out1str(he.str);
343                 } else {
344                         const char *s = pat ?
345                            fc_replace(he.str, pat, repl) : he.str;
346
347                         if (sflg) {
348                                 if (displayhist) {
349                                         out2str(s);
350                                         flushout(out2);
351                                 }
352                                 evalstring(s, 0);
353                                 if (displayhist && hist) {
354                                         /*
355                                          *  XXX what about recursive and
356                                          *  relative histnums.
357                                          */
358                                         oldhistnum = he.num;
359                                         history(hist, &he, H_ENTER, s);
360                                         /*
361                                          * XXX H_ENTER moves the internal
362                                          * cursor, set it back to the current
363                                          * entry.
364                                          */
365                                         retval = history(hist, &he,
366                                             H_NEXT_EVENT, oldhistnum);
367                                 }
368                         } else
369                                 fputs(s, efp);
370                 }
371                 /*
372                  * At end?  (if we were to lose last, we'd sure be
373                  * messed up).
374                  */
375                 if (he.num == last)
376                         break;
377         }
378         if (editor) {
379                 char *editcmd;
380
381                 fclose(efp);
382                 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
383                 sprintf(editcmd, "%s %s", editor, editfile);
384                 evalstring(editcmd, 0); /* XXX - should use no JC command */
385                 INTON;
386                 readcmdfile(editfile);  /* XXX - should read back - quick tst */
387                 unlink(editfile);
388         }
389
390         if (lflg == 0 && active > 0)
391                 --active;
392         if (displayhist)
393                 displayhist = 0;
394         handler = savehandler;
395         return 0;
396 }
397
398 static char *
399 fc_replace(const char *s, char *p, char *r)
400 {
401         char *dest;
402         int plen = strlen(p);
403
404         STARTSTACKSTR(dest);
405         while (*s) {
406                 if (*s == *p && strncmp(s, p, plen) == 0) {
407                         STPUTS(r, dest);
408                         s += plen;
409                         *p = '\0';      /* so no more matches */
410                 } else
411                         STPUTC(*s++, dest);
412         }
413         STPUTC('\0', dest);
414         dest = grabstackstr(dest);
415
416         return (dest);
417 }
418
419 static int
420 not_fcnumber(const char *s)
421 {
422         if (s == NULL)
423                 return (0);
424         if (*s == '-')
425                 s++;
426         return (!is_number(s));
427 }
428
429 static int
430 str_to_event(const char *str, int last)
431 {
432         HistEvent he;
433         const char *s = str;
434         int relative = 0;
435         int i, retval;
436
437         retval = history(hist, &he, H_FIRST);
438         switch (*s) {
439         case '-':
440                 relative = 1;
441                 /*FALLTHROUGH*/
442         case '+':
443                 s++;
444         }
445         if (is_number(s)) {
446                 i = atoi(s);
447                 if (relative) {
448                         while (retval != -1 && i--) {
449                                 retval = history(hist, &he, H_NEXT);
450                         }
451                         if (retval == -1)
452                                 retval = history(hist, &he, H_LAST);
453                 } else {
454                         retval = history(hist, &he, H_NEXT_EVENT, i);
455                         if (retval == -1) {
456                                 /*
457                                  * the notion of first and last is
458                                  * backwards to that of the history package
459                                  */
460                                 retval = history(hist, &he, last ? H_FIRST : H_LAST);
461                         }
462                 }
463                 if (retval == -1)
464                         error("history number %s not found (internal error)",
465                                str);
466         } else {
467                 /*
468                  * pattern
469                  */
470                 retval = history(hist, &he, H_PREV_STR, str);
471                 if (retval == -1)
472                         error("history pattern not found: %s", str);
473         }
474         return (he.num);
475 }
476
477 int
478 bindcmd(int argc, char **argv)
479 {
480
481         if (el == NULL)
482                 error("line editing is disabled");
483         return (el_parse(el, argc, __DECONST(const char **, argv)));
484 }
485
486 #else
487
488 int
489 histcmd(int argc __unused, char **argv __unused)
490 {
491
492         error("not compiled with history support");
493         /*NOTREACHED*/
494         return (0);
495 }
496
497 int
498 bindcmd(int argc __unused, char **argv __unused)
499 {
500
501         error("not compiled with line editing support");
502         return (0);
503 }
504 #endif