1 /* 2 * Copyright (c) 2014, STMicroelectronics International N.V. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 /* 29 * This file provides extensions for functions not defined in <string.h> 30 */ 31 32 #ifndef STRING_EXT_H 33 #define STRING_EXT_H 34 35 #include <stddef.h> 36 #include <sys/cdefs.h> 37 38 /* 39 * Copy src to string dst of siz size. At most siz-1 characters 40 * will be copied. Always NUL terminates (unless siz == 0). 41 * Returns strlen(src); if retval >= siz, truncation occurred. 42 */ 43 size_t strlcpy(char *dst, const char *src, size_t size); 44 size_t strlcat(char *dst, const char *src, size_t size); 45 46 /* 47 * This memory compare function will compare two buffers in a constant time. 48 * 49 * Note that this function will not have same kind of return values as the 50 * traditional libc memcmp which return either less than or greater than zero 51 * depending on which string that is lexically greater. This function will 52 * return 0 if it is a match, otherwise it will return a non-zero value. 53 */ 54 int buf_compare_ct(const void *s1, const void *s2, size_t n); 55 56 #endif /* STRING_EXT_H */ 57