1 /**************************************************************************** 2 * Copyright (c) 1998-2009,2010 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 42 MODULE_ID("$Id: add_tries.c,v 1.10 2010/12/19 01:31:14 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 47 NCURSES_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)"), 54 (void *) *tree, _nc_visbuf(str), code)); 55 if (txt == 0 || *txt == '\0' || code == 0) 56 returnCode(ERR); 57 58 if ((*tree) != 0) { 59 ptr = savedptr = (*tree); 60 61 for (;;) { 62 unsigned char cmp = *txt; 63 64 while (!CMP_TRY(ptr->ch, cmp) 65 && ptr->sibling != 0) 66 ptr = ptr->sibling; 67 68 if (CMP_TRY(ptr->ch, cmp)) { 69 if (*(++txt) == '\0') { 70 ptr->value = (unsigned short) code; 71 returnCode(OK); 72 } 73 if (ptr->child != 0) 74 ptr = ptr->child; 75 else 76 break; 77 } else { 78 if ((ptr->sibling = typeCalloc(TRIES, 1)) == 0) { 79 returnCode(ERR); 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(TRIES, 1); 91 92 if (ptr == 0) { 93 returnCode(ERR); 94 } 95 96 SET_TRY(ptr, txt); 97 ptr->value = 0; 98 } 99 100 /* at this point, we are adding to the try. ptr->child == 0 */ 101 102 while (*txt) { 103 ptr->child = typeCalloc(TRIES, 1); 104 105 ptr = ptr->child; 106 107 if (ptr == 0) { 108 while ((ptr = savedptr) != 0) { 109 savedptr = ptr->child; 110 free(ptr); 111 } 112 returnCode(ERR); 113 } 114 115 SET_TRY(ptr, txt); 116 ptr->value = 0; 117 } 118 119 ptr->value = (unsigned short) code; 120 returnCode(OK); 121 } 122