1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright 2021 Oxide Computer Company 14 */ 15 16 /* 17 * memrchr(3C) implementation. Find the first occurence of 'c' as an unsigned 18 * char in 's', by searching in reverse. 19 */ 20 21 #include <string.h> 22 23 void * 24 memrchr(const void *s, int c, size_t len) 25 { 26 unsigned char val = (unsigned char)c; 27 const unsigned char *data = s; 28 29 for (; len > 0; len--) { 30 size_t pos = len - 1; 31 32 if (data[pos] == val) { 33 return ((void *)&data[pos]); 34 } 35 } 36 37 return (NULL); 38 } 39