Question

Below is one of my C functiosn:

void test(char * ptr)
{
    ptr[0] = 'T';
    ptr[1] = 'O';
    ptr[2] = 'P';
    ptr[3] = '\0';
}

Is there a way to shorten this? I’ve tried

void test(char * ptr)
{
    ptr[0] = "TOP";
}

but that doesn’t work. [Note: I do not have the library function strcpy() or similar.]

Answer 1

No, you need to write your own strcpy(). You can only do char ptr[] = "TOP" for initializers.

But you can do this which can easily be changed to strcpy():

void test(char * ptr)
{
    char * S_TOP = "TOP";

    do {
        *ptr++ = *S_TOP++;
    } while( *S_TOP != '\0' );
}