xref: /aosp_15_r20/external/arm-trusted-firmware/lib/libc/memcmp.c (revision 54fd6939e177f8ff529b10183254802c76df6d08) 
1*54fd6939SJiyong Park /*
2*54fd6939SJiyong Park  * Copyright (c) 2013-2019, ARM Limited and Contributors. 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 <stddef.h>
8*54fd6939SJiyong Park #include <string.h>
9*54fd6939SJiyong Park 
memcmp(const void * s1,const void * s2,size_t len)10*54fd6939SJiyong Park int memcmp(const void *s1, const void *s2, size_t len)
11*54fd6939SJiyong Park {
12*54fd6939SJiyong Park 	const unsigned char *s = s1;
13*54fd6939SJiyong Park 	const unsigned char *d = s2;
14*54fd6939SJiyong Park 	unsigned char sc;
15*54fd6939SJiyong Park 	unsigned char dc;
16*54fd6939SJiyong Park 
17*54fd6939SJiyong Park 	while (len--) {
18*54fd6939SJiyong Park 		sc = *s++;
19*54fd6939SJiyong Park 		dc = *d++;
20*54fd6939SJiyong Park 		if (sc - dc)
21*54fd6939SJiyong Park 			return (sc - dc);
22*54fd6939SJiyong Park 	}
23*54fd6939SJiyong Park 
24*54fd6939SJiyong Park 	return 0;
25*54fd6939SJiyong Park }
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