xref: /aosp_15_r20/external/arm-trusted-firmware/lib/libc/memrchr.c (revision 54fd6939e177f8ff529b10183254802c76df6d08) 
1*54fd6939SJiyong Park /*
2*54fd6939SJiyong Park  * Copyright (c) 2019, Arm Limited. All rights reserved.
3*54fd6939SJiyong Park  *
4*54fd6939SJiyong Park  * SPDX-License-Identifier: BSD-3-Clause
5*54fd6939SJiyong Park  */
6*54fd6939SJiyong Park 
7*54fd6939SJiyong Park #include <string.h>
8*54fd6939SJiyong Park 
9*54fd6939SJiyong Park #undef memrchr
10*54fd6939SJiyong Park 
memrchr(const void * src,int c,size_t len)11*54fd6939SJiyong Park void *memrchr(const void *src, int c, size_t len)
12*54fd6939SJiyong Park {
13*54fd6939SJiyong Park 	const unsigned char *s = src + (len - 1);
14*54fd6939SJiyong Park 
15*54fd6939SJiyong Park 	while (len--) {
16*54fd6939SJiyong Park 		if (*s == (unsigned char)c) {
17*54fd6939SJiyong Park 			return (void*) s;
18*54fd6939SJiyong Park 		}
19*54fd6939SJiyong Park 
20*54fd6939SJiyong Park 		s--;
21*54fd6939SJiyong Park 	}
22*54fd6939SJiyong Park 
23*54fd6939SJiyong Park 	return NULL;
24*54fd6939SJiyong Park }
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