1 /**************************************************************************** 2 * Copyright (c) 2000-2007,2012 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 * 31 ****************************************************************************/ 32 33 /* 34 ** lib_mvcur.c 35 **/ 36 37 #include <curses.priv.h> 38 39 MODULE_ID("$Id: strings.c,v 1.8 2012/02/22 22:34:31 tom Exp $") 40 41 /**************************************************************************** 42 * Useful string functions (especially for mvcur) 43 ****************************************************************************/ 44 45 #if !HAVE_STRSTR 46 NCURSES_EXPORT(char *) 47 _nc_strstr(const char *haystack, const char *needle) 48 { 49 size_t len1 = strlen(haystack); 50 size_t len2 = strlen(needle); 51 char *result = 0; 52 53 while ((len1 != 0) && (len1-- >= len2)) { 54 if (!strncmp(haystack, needle, len2)) { 55 result = (char *) haystack; 56 break; 57 } 58 haystack++; 59 } 60 return result; 61 } 62 #endif 63 64 /* 65 * Initialize the descriptor so we can append to it. Note that 'src' may 66 * be a null pointer (see _nc_str_null), so the corresponding strcat and 67 * strcpy calls have to allow for this. 68 */ 69 NCURSES_EXPORT(string_desc *) 70 _nc_str_init(string_desc * dst, char *src, size_t len) 71 { 72 if (dst != 0) { 73 dst->s_head = src; 74 dst->s_tail = src; 75 dst->s_size = len - 1; 76 dst->s_init = dst->s_size; 77 if (src != 0) 78 *src = 0; 79 } 80 return dst; 81 } 82 83 /* 84 * Initialize the descriptor for only tracking the amount of memory used. 85 */ 86 NCURSES_EXPORT(string_desc *) 87 _nc_str_null(string_desc * dst, size_t len) 88 { 89 return _nc_str_init(dst, 0, len); 90 } 91 92 /* 93 * Copy a descriptor 94 */ 95 NCURSES_EXPORT(string_desc *) 96 _nc_str_copy(string_desc * dst, string_desc * src) 97 { 98 *dst = *src; 99 return dst; 100 } 101 102 /* 103 * Replaces strcat into a fixed buffer, returning false on failure. 104 */ 105 NCURSES_EXPORT(bool) 106 _nc_safe_strcat(string_desc * dst, const char *src) 107 { 108 if (src != 0) { 109 size_t len = strlen(src); 110 111 if (len < dst->s_size) { 112 if (dst->s_tail != 0) { 113 _nc_STRCPY(dst->s_tail, src, dst->s_size); 114 dst->s_tail += len; 115 } 116 dst->s_size -= len; 117 return TRUE; 118 } 119 } 120 return FALSE; 121 } 122 123 /* 124 * Replaces strcpy into a fixed buffer, returning false on failure. 125 */ 126 NCURSES_EXPORT(bool) 127 _nc_safe_strcpy(string_desc * dst, const char *src) 128 { 129 if (src != 0) { 130 size_t len = strlen(src); 131 132 if (len < dst->s_size) { 133 if (dst->s_head != 0) { 134 _nc_STRCPY(dst->s_head, src, dst->s_size); 135 dst->s_tail = dst->s_head + len; 136 } 137 dst->s_size = dst->s_init - len; 138 return TRUE; 139 } 140 } 141 return FALSE; 142 } 143