1/**************************************************************************** 2 * Copyright (c) 1998-2005,2006 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 28 29/**************************************************************************** 30 * Author: Thomas E. Dickey 1998-on * 31 ****************************************************************************/ 32 33/* 34** add_tries.c 35** 36** Add keycode/string to tries-tree. 37** 38*/ 39 40#include <curses.priv.h> 41 42MODULE_ID("$Id: add_tries.c,v 1.8 2006/12/30 23:15:26 tom Exp $") 43 44#define SET_TRY(dst,src) if ((dst->ch = *src++) == 128) dst->ch = '\0' 45#define CMP_TRY(a,b) ((a)? (a == b) : (b == 128)) 46 47NCURSES_EXPORT(int) 48_nc_add_to_try(TRIES ** tree, const char *str, unsigned code) 49{ 50 TRIES *ptr, *savedptr; 51 unsigned const char *txt = (unsigned const char *) str; 52 53 T((T_CALLED("_nc_add_to_try(%p, %s, %u)"), *tree, _nc_visbuf(str), code)); 54 if (txt == 0 || *txt == '\0' || code == 0) 55 returnCode(ERR); 56 57 if ((*tree) != 0) { 58 ptr = savedptr = (*tree); 59 60 for (;;) { 61 unsigned char cmp = *txt; 62 63 while (!CMP_TRY(ptr->ch, cmp) 64 && ptr->sibling != 0) 65 ptr = ptr->sibling; 66 67 if (CMP_TRY(ptr->ch, cmp)) { 68 if (*(++txt) == '\0') { 69 ptr->value = code; 70 returnCode(OK); 71 } 72 if (ptr->child != 0) 73 ptr = ptr->child; 74 else 75 break; 76 } else { 77 if ((ptr->sibling = typeCalloc(TRIES, 1)) == 0) { 78 returnCode(ERR); 79 } 80 81 savedptr = ptr = ptr->sibling; 82 SET_TRY(ptr, txt); 83 ptr->value = 0; 84 85 break; 86 } 87 } /* end for (;;) */ 88 } else { /* (*tree) == 0 :: First sequence to be added */ 89 savedptr = ptr = (*tree) = typeCalloc(TRIES, 1); 90 91 if (ptr == 0) { 92 returnCode(ERR); 93 } 94 95 SET_TRY(ptr, txt); 96 ptr->value = 0; 97 } 98 99 /* at this point, we are adding to the try. ptr->child == 0 */ 100 101 while (*txt) { 102 ptr->child = typeCalloc(TRIES, 1); 103 104 ptr = ptr->child; 105 106 if (ptr == 0) { 107 while ((ptr = savedptr) != 0) { 108 savedptr = ptr->child; 109 free(ptr); 110 } 111 returnCode(ERR); 112 } 113 114 SET_TRY(ptr, txt); 115 ptr->value = 0; 116 } 117 118 ptr->value = code; 119 returnCode(OK); 120} 121