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From: "zhuyan34 at huawei dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/25824] Abnormal function of strnlen in aarch64
Date: Wed, 15 Apr 2020 14:13:24 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D25824

--- Comment #2 from Yan Zhu <zhuyan34 at huawei dot com> ---
There is a testcase.

#include <stdio.h>
#include <string.h>

void init_base(char *base, int len)
{
        int i;
        for (i =3D 0; i < len; i++) {
                base[i] =3D 'x';
        }
        base[len] =3D '\0';
}

int main(int argc, char *argv[])
{
        int i;
        char base[1000];
        char buff[1000];
        size_t n;

        for (i =3D 1; i < 1000; i++) {
                memset(buff, 0, 1000);
                init_base(base, i);=20=20=20=20=20=20=20=20=20=20=20=20=20
                n =3D strnlen(base, 1000);=20=20=20=20=20=20
                if ( i =3D=3D n )
                        printf("size=3D%d is equel\n", i);
                else
                        printf("size=3D%d is not equel%s\n", i);
        }

    return 0;
}


The execution log is as follows=EF=BC=9A

arm64be /tmp # ./arm64be-test_strnlen
size=3D1 is equel
size=3D2 is equel
size=3D3 is equel
size=3D4 is equel
size=3D5 is equel
size=3D6 is equel
size=3D7 is equel
size=3D8 is equel
size=3D9 is not equel
size=3D10 is not equel
size=3D11 is not equel
size=3D12 is not equel
size=3D13 is not equel

--=20
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