[SOLVED] strrev() function can't be used even after including string.h in Ubuntu 20.04, compiler gcc 9.3.0. What can I do?

Issue

I am unable to use strrev() function even after including string.h in Ubuntu 20.04. Compiler says undefined reference to strrev(), but strlen() and other functions work. What should I do?

Solution

You need to implement it yourself.

char *strrev(char *str)
{
    char *end, *wrk = str;
    {
        if(str && *str)
        {
            end = str + strlen(str) - 1;
            while(end > wrk)
            {
                char temp;

                temp = *wrk;
                *wrk++ = *end;
                *end-- = temp;
            }
        }
    }
    return str;
}

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