1 /* $NetBSD: key.c,v 1.13 2002/03/18 16:00:55 christos Exp $ */
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Christos Zoulas of Cornell University.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
40 #if !defined(lint) && !defined(SCCSID)
42 static char sccsid[] = "@(#)key.c 8.1 (Berkeley) 6/4/93";
44 __RCSID("$NetBSD: key.c,v 1.13 2002/03/18 16:00:55 christos Exp $");
46 #endif /* not lint && not SCCSID */
49 * key.c: This module contains the procedures for maintaining
50 * the extended-key map.
52 * An extended-key (key) is a sequence of keystrokes introduced
53 * with an sequence introducer and consisting of an arbitrary
54 * number of characters. This module maintains a map (the el->el_key.map)
55 * to convert these extended-key sequences into input strs
56 * (XK_STR), editor functions (XK_CMD), or unix commands (XK_EXE).
59 * If key is a substr of some other keys, then the longer
60 * keys are lost!! That is, if the keys "abcd" and "abcef"
61 * are in el->el_key.map, adding the key "abc" will cause the first two
62 * definitions to be lost.
66 * 1) It is not possible to have one key that is a
75 * The Nodes of the el->el_key.map. The el->el_key.map is a linked list
76 * of these node elements
79 char ch; /* single character of key */
80 int type; /* node type */
81 key_value_t val; /* command code or pointer to str, */
82 /* if this is a leaf */
83 struct key_node_t *next; /* ptr to next char of this key */
84 struct key_node_t *sibling; /* ptr to another key with same prefix*/
87 private int node_trav(EditLine *, key_node_t *, char *,
89 private int node__try(EditLine *, key_node_t *, const char *,
91 private key_node_t *node__get(int);
92 private void node__put(EditLine *, key_node_t *);
93 private int node__delete(EditLine *, key_node_t **, const char *);
94 private int node_lookup(EditLine *, const char *, key_node_t *,
96 private int node_enum(EditLine *, key_node_t *, int);
97 private int key__decode_char(char *, int, int);
99 #define KEY_BUFSIZ EL_BUFSIZ
103 * Initialize the key maps
106 key_init(EditLine *el)
109 el->el_key.buf = (char *) el_malloc(KEY_BUFSIZ);
110 if (el->el_key.buf == NULL)
112 el->el_key.map = NULL;
122 key_end(EditLine *el)
125 el_free((ptr_t) el->el_key.buf);
126 el->el_key.buf = NULL;
127 node__put(el, el->el_key.map);
128 el->el_key.map = NULL;
133 * Associate cmd with a key value
135 protected key_value_t *
136 key_map_cmd(EditLine *el, int cmd)
139 el->el_key.val.cmd = (el_action_t) cmd;
140 return (&el->el_key.val);
145 * Associate str with a key value
147 protected key_value_t *
148 key_map_str(EditLine *el, char *str)
151 el->el_key.val.str = str;
152 return (&el->el_key.val);
157 * Takes all nodes on el->el_key.map and puts them on free list. Then
158 * initializes el->el_key.map with arrow keys
159 * [Always bind the ansi arrow keys?]
162 key_reset(EditLine *el)
165 node__put(el, el->el_key.map);
166 el->el_key.map = NULL;
172 * Calls the recursive function with entry point el->el_key.map
173 * Looks up *ch in map and then reads characters until a
174 * complete match is found or a mismatch occurs. Returns the
175 * type of the match found (XK_STR, XK_CMD, or XK_EXE).
176 * Returns NULL in val.str and XK_STR for no match.
177 * The last character read is returned in *ch.
180 key_get(EditLine *el, char *ch, key_value_t *val)
183 return (node_trav(el, el->el_key.map, ch, val));
188 * Adds key to the el->el_key.map and associates the value in val with it.
189 * If key is already is in el->el_key.map, the new code is applied to the
190 * existing key. Ntype specifies if code is a command, an
191 * out str or a unix command.
194 key_add(EditLine *el, const char *key, key_value_t *val, int ntype)
197 if (key[0] == '\0') {
198 (void) fprintf(el->el_errfile,
199 "key_add: Null extended-key not allowed.\n");
202 if (ntype == XK_CMD && val->cmd == ED_SEQUENCE_LEAD_IN) {
203 (void) fprintf(el->el_errfile,
204 "key_add: sequence-lead-in command not allowed\n");
207 if (el->el_key.map == NULL)
208 /* tree is initially empty. Set up new node to match key[0] */
209 el->el_key.map = node__get(key[0]);
210 /* it is properly initialized */
212 /* Now recurse through el->el_key.map */
213 (void) node__try(el, el->el_key.map, key, val, ntype);
222 key_clear(EditLine *el, el_action_t *map, const char *in)
225 if ((map[(unsigned char)*in] == ED_SEQUENCE_LEAD_IN) &&
226 ((map == el->el_map.key &&
227 el->el_map.alt[(unsigned char)*in] != ED_SEQUENCE_LEAD_IN) ||
228 (map == el->el_map.alt &&
229 el->el_map.key[(unsigned char)*in] != ED_SEQUENCE_LEAD_IN)))
230 (void) key_delete(el, in);
235 * Delete the key and all longer keys staring with key, if
239 key_delete(EditLine *el, const char *key)
242 if (key[0] == '\0') {
243 (void) fprintf(el->el_errfile,
244 "key_delete: Null extended-key not allowed.\n");
247 if (el->el_key.map == NULL)
250 (void) node__delete(el, &el->el_key.map, key);
256 * Print the binding associated with key key.
257 * Print entire el->el_key.map if null
260 key_print(EditLine *el, const char *key)
263 /* do nothing if el->el_key.map is empty and null key specified */
264 if (el->el_key.map == NULL && *key == 0)
267 el->el_key.buf[0] = '"';
268 if (node_lookup(el, key, el->el_key.map, 1) <= -1)
269 /* key is not bound */
270 (void) fprintf(el->el_errfile, "Unbound extended key \"%s\"\n",
277 * recursively traverses node in tree until match or mismatch is
278 * found. May read in more characters.
281 node_trav(EditLine *el, key_node_t *ptr, char *ch, key_value_t *val)
284 if (ptr->ch == *ch) {
287 /* key not complete so get next char */
288 if (el_getc(el, ch) != 1) { /* if EOF or error */
289 val->cmd = ED_END_OF_FILE;
291 /* PWP: Pretend we just read an end-of-file */
293 return (node_trav(el, ptr->next, ch, val));
296 if (ptr->type != XK_CMD)
301 /* no match found here */
303 /* try next sibling */
304 return (node_trav(el, ptr->sibling, ch, val));
306 /* no next sibling -- mismatch */
315 * Find a node that matches *str or allocate a new one
318 node__try(EditLine *el, key_node_t *ptr, const char *str, key_value_t *val, int ntype)
321 if (ptr->ch != *str) {
324 for (xm = ptr; xm->sibling != NULL; xm = xm->sibling)
325 if (xm->sibling->ch == *str)
327 if (xm->sibling == NULL)
328 xm->sibling = node__get(*str); /* setup new node */
331 if (*++str == '\0') {
333 if (ptr->next != NULL) {
334 node__put(el, ptr->next);
335 /* lose longer keys with this prefix */
345 el_free((ptr_t) ptr->val.str);
348 EL_ABORT((el->el_errfile, "Bad XK_ type %d\n",
353 switch (ptr->type = ntype) {
359 ptr->val.str = strdup(val->str);
362 EL_ABORT((el->el_errfile, "Bad XK_ type %d\n", ntype));
366 /* still more chars to go */
367 if (ptr->next == NULL)
368 ptr->next = node__get(*str); /* setup new node */
369 (void) node__try(el, ptr->next, str, val, ntype);
376 * Delete node that matches str
379 node__delete(EditLine *el, key_node_t **inptr, const char *str)
382 key_node_t *prev_ptr = NULL;
386 if (ptr->ch != *str) {
389 for (xm = ptr; xm->sibling != NULL; xm = xm->sibling)
390 if (xm->sibling->ch == *str)
392 if (xm->sibling == NULL)
397 if (*++str == '\0') {
399 if (prev_ptr == NULL)
400 *inptr = ptr->sibling;
402 prev_ptr->sibling = ptr->sibling;
406 } else if (ptr->next != NULL &&
407 node__delete(el, &ptr->next, str) == 1) {
408 if (ptr->next != NULL)
410 if (prev_ptr == NULL)
411 *inptr = ptr->sibling;
413 prev_ptr->sibling = ptr->sibling;
424 * Puts a tree of nodes onto free list using free(3).
427 node__put(EditLine *el, key_node_t *ptr)
432 if (ptr->next != NULL) {
433 node__put(el, ptr->next);
436 node__put(el, ptr->sibling);
444 if (ptr->val.str != NULL)
445 el_free((ptr_t) ptr->val.str);
448 EL_ABORT((el->el_errfile, "Bad XK_ type %d\n", ptr->type));
451 el_free((ptr_t) ptr);
456 * Returns pointer to an key_node_t for ch.
463 ptr = (key_node_t *) el_malloc((size_t) sizeof(key_node_t));
477 * look for the str starting at node ptr.
481 node_lookup(EditLine *el, const char *str, key_node_t *ptr, int cnt)
486 return (-1); /* cannot have null ptr */
489 /* no more chars in str. node_enum from here. */
490 (void) node_enum(el, ptr, cnt);
493 /* If match put this char into el->el_key.buf. Recurse */
494 if (ptr->ch == *str) {
496 ncnt = key__decode_char(el->el_key.buf, cnt,
497 (unsigned char) ptr->ch);
498 if (ptr->next != NULL)
499 /* not yet at leaf */
500 return (node_lookup(el, str + 1, ptr->next,
503 /* next node is null so key should be complete */
505 el->el_key.buf[ncnt + 1] = '"';
506 el->el_key.buf[ncnt + 2] = '\0';
507 key_kprint(el, el->el_key.buf,
508 &ptr->val, ptr->type);
512 /* mismatch -- str still has chars */
515 /* no match found try sibling */
517 return (node_lookup(el, str, ptr->sibling,
527 * Traverse the node printing the characters it is bound in buffer
530 node_enum(EditLine *el, key_node_t *ptr, int cnt)
534 if (cnt >= KEY_BUFSIZ - 5) { /* buffer too small */
535 el->el_key.buf[++cnt] = '"';
536 el->el_key.buf[++cnt] = '\0';
537 (void) fprintf(el->el_errfile,
538 "Some extended keys too long for internal print buffer");
539 (void) fprintf(el->el_errfile, " \"%s...\"\n", el->el_key.buf);
544 (void) fprintf(el->el_errfile,
545 "node_enum: BUG!! Null ptr passed\n!");
549 /* put this char at end of str */
550 ncnt = key__decode_char(el->el_key.buf, cnt, (unsigned char) ptr->ch);
551 if (ptr->next == NULL) {
552 /* print this key and function */
553 el->el_key.buf[ncnt + 1] = '"';
554 el->el_key.buf[ncnt + 2] = '\0';
555 key_kprint(el, el->el_key.buf, &ptr->val, ptr->type);
557 (void) node_enum(el, ptr->next, ncnt + 1);
559 /* go to sibling if there is one */
561 (void) node_enum(el, ptr->sibling, cnt);
567 * Print the specified key and its associated
568 * function specified by val
571 key_kprint(EditLine *el, const char *key, key_value_t *val, int ntype)
574 char unparsbuf[EL_BUFSIZ];
575 static const char fmt[] = "%-15s-> %s\n";
581 (void) fprintf(el->el_outfile, fmt, key,
582 key__decode_str(val->str, unparsbuf,
583 ntype == XK_STR ? "\"\"" : "[]"));
586 for (fp = el->el_map.help; fp->name; fp++)
587 if (val->cmd == fp->func) {
588 (void) fprintf(el->el_outfile, fmt,
593 if (fp->name == NULL)
594 (void) fprintf(el->el_outfile,
595 "BUG! Command not found.\n");
600 EL_ABORT((el->el_errfile, "Bad XK_ type %d\n", ntype));
604 (void) fprintf(el->el_outfile, fmt, key, "no input");
608 /* key__decode_char():
609 * Put a printable form of char in buf.
612 key__decode_char(char *buf, int cnt, int ch)
624 buf[cnt] = ch | 0100;
625 } else if (ch == '^') {
628 } else if (ch == '\\') {
631 } else if (ch == ' ' || (isprint(ch) && !isspace(ch))) {
635 buf[cnt++] = (((unsigned int) ch >> 6) & 7) + '0';
636 buf[cnt++] = (((unsigned int) ch >> 3) & 7) + '0';
637 buf[cnt] = (ch & 7) + '0';
643 /* key__decode_str():
644 * Make a printable version of the ey
647 key__decode_str(const char *str, char *buf, const char *sep)
658 if (sep[0] != '\0' && sep[1] != '\0')
663 for (p = str; *p != 0; p++) {
664 if (iscntrl((unsigned char) *p)) {
670 } else if (*p == '^' || *p == '\\') {
673 } else if (*p == ' ' || (isprint((unsigned char) *p) &&
674 !isspace((unsigned char) *p))) {
678 *b++ = (((unsigned int) *p >> 6) & 7) + '0';
679 *b++ = (((unsigned int) *p >> 3) & 7) + '0';
680 *b++ = (*p & 7) + '0';
683 if (sep[0] != '\0' && sep[1] != '\0')
686 return (buf); /* should check for overflow */