add_tries.c revision 76726
1/**************************************************************************** 2 * Copyright (c) 1998,2000 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 <dickey@clark.net> 1998 * 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 1.4 2000/12/10 02:55:07 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(void) 48_nc_add_to_try(struct tries **tree, const char *str, unsigned short code) 49{ 50 static bool out_of_memory = FALSE; 51 struct tries *ptr, *savedptr; 52 unsigned const char *txt = (unsigned const char *) str; 53 54 if (txt == 0 || *txt == '\0' || out_of_memory || code == 0) 55 return; 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 return; 71 } 72 if (ptr->child != 0) 73 ptr = ptr->child; 74 else 75 break; 76 } else { 77 if ((ptr->sibling = typeCalloc(struct tries, 1)) == 0) { 78 out_of_memory = TRUE; 79 return; 80 } 81 82 savedptr = ptr = ptr->sibling; 83 SET_TRY(ptr, txt); 84 ptr->value = 0; 85 86 break; 87 } 88 } /* end for (;;) */ 89 } else { /* (*tree) == 0 :: First sequence to be added */ 90 savedptr = ptr = (*tree) = typeCalloc(struct tries, 1); 91 92 if (ptr == 0) { 93 out_of_memory = TRUE; 94 return; 95 } 96 97 SET_TRY(ptr, txt); 98 ptr->value = 0; 99 } 100 101 /* at this point, we are adding to the try. ptr->child == 0 */ 102 103 while (*txt) { 104 ptr->child = typeCalloc(struct tries, 1); 105 106 ptr = ptr->child; 107 108 if (ptr == 0) { 109 out_of_memory = TRUE; 110 111 while ((ptr = savedptr) != 0) { 112 savedptr = ptr->child; 113 free(ptr); 114 } 115 116 return; 117 } 118 119 SET_TRY(ptr, txt); 120 ptr->value = 0; 121 } 122 123 ptr->value = code; 124 return; 125} 126