1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * Copyright (c) 2014, STMicroelectronics International N.V. 4 */ 5 6 /* 7 * This file provides extensions for functions not defined in <string.h> 8 */ 9 10 #ifndef STRING_EXT_H 11 #define STRING_EXT_H 12 13 #include <stddef.h> 14 #include <sys/cdefs.h> 15 16 /* 17 * Copy src to string dst of siz size. At most siz-1 characters 18 * will be copied. Always NUL terminates (unless siz == 0). 19 * Returns strlen(src); if retval >= siz, truncation occurred. 20 */ 21 size_t strlcpy(char *dst, const char *src, size_t size); 22 size_t strlcat(char *dst, const char *src, size_t size); 23 24 /* 25 * This memory compare function will compare two buffers in a constant time. 26 * 27 * Note that this function will not have same kind of return values as the 28 * traditional libc memcmp which return either less than or greater than zero 29 * depending on which string that is lexically greater. This function will 30 * return 0 if it is a match, otherwise it will return a non-zero value. 31 */ 32 int buf_compare_ct(const void *s1, const void *s2, size_t n); 33 34 #endif /* STRING_EXT_H */ 35