strnlen_s.c

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#include <stdint.h>
#include <string.h>
 
size_t strnlen_s(const char* s, size_t maxsize)
{
    if (s == NULL)
    {
        return 0;
    }
 
    for (size_t i = 0; i < maxsize; i++)
    {
        if (s[i] == '\0')
        {
            return i;
        }
    }
 
    return maxsize;
}