[Bug libc/25824] Abnormal function of strnlen in aarch64

[zhuyan34 at huawei dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25824

--- Comment #3 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 = 0; i < len; i++) {
                base[i] = 'x';
        }
        base[len] = '\0';
}

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

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

    return 0;
}


The execution log is as follows：

arm64be /tmp # ./arm64be-test_strnlen
size=1 is equel
size=2 is equel
size=3 is equel
size=4 is equel
size=5 is equel
size=6 is equel
size=7 is equel
size=8 is equel
size=9 is not equel
size=10 is not equel
size=11 is not equel
size=12 is not equel
size=13 is not equel

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