usr/src/lib/libcurses/screen/delkey.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #pragma ident   "%Z%%M% %I%     %E% SMI"
  41
  42 /*LINTLIBRARY*/
  43
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <sys/types.h>
  47 #include "curses_inc.h"
  48
  49 /* Delete keys matching pat or key from the key map. */
  50
  51 int
  52 delkey(char *sends, int keyval)
  53 {
  54         _KEY_MAP        *kp, **kpp = cur_term->_keys, **fpp, **dpp;
  55         int             mask = 0, cmp, numkeys = cur_term->_ksz;
  56         int             counter = 0, i, num_deleted_keys = 0;
  57         short           *lkorder = &(cur_term->_lastkey_ordered),
  58                         *first_macro = &(cur_term->_first_macro),
  59                         *lmorder = &(cur_term->_lastmacro_ordered);
  60
  61         /* for ease of determination of key to delete */
  62         if (sends)
  63                 mask |= 01;
  64         if (keyval >= 0)
  65                 mask |= 02;
  66
  67         /* check each key */
  68         while (++counter < numkeys) {
  69                 kp = *kpp;
  70                 cmp = 0;
  71                 if (sends && (strcmp(sends, kp->_sends) == 0))
  72                         cmp |= 01;
  73                 if (kp->_keyval == keyval)
  74                         cmp |= 02;
  75
  76                 /* found one to delete */
  77                 if (cmp == mask) {
  78                         num_deleted_keys++;
  79                         /*
  80                          * If it was an externally created key, then the address
  81                          * of the sequence will be right after the structure.
  82                          * See the malloc in newkey.
  83                          */
  84                         if (kp->_sends == ((char *)kp + sizeof (_KEY_MAP)))
  85                                 free(kp);
  86
  87                         /* shift left other keys */
  88                         i = (numkeys - counter) - 1;
  89                         for (fpp = kpp, dpp = kpp + 1; i > 0; i--, fpp++, dpp++)
  90                                 *fpp = *dpp;
  91                         if (counter <= *lmorder) {
  92                                 if (counter < *first_macro) {
  93                                         if (counter <= *lkorder)
  94                                                 (*lkorder)--;
  95                                         (*first_macro)--;
  96                                 }
  97                                 (*lmorder)--;
  98                         }
  99                 } else
 100                         kpp++;
 101         }
 102
 103 /* Check if we've crossed boundary and/or hit 0 */
 104
 105         if ((cur_term->_ksz -= num_deleted_keys) == 0)
 106                 (void) delkeymap(cur_term);
 107         else
 108                 cur_term->_keys = (_KEY_MAP **) realloc((char *)
 109                     cur_term->_keys, (unsigned)cur_term->_ksz);
 110
 111         return (num_deleted_keys);
 112 }