Question

I’m trying to memset an array of ints that exist inside a structure:

typedef struct _xyz {
    int zList[9000];
} xyz;

int dll_tmain(void)
{
    xyz *Xyz       =  (xyz *) calloc(10, sizeof(xyz));
    memset((&Xyz[0])->zList, 1, 9000);
}

I’ve tried a lot of variations in the memset(), to no avail. Instead of being
initialized to 1, the number is some huge value;

Answer 1

Remember that memset sets each byte of an array to the same value. So you are copying, to the first 9000 bytes of the array, the byte with value 1. Assuming 4 byte integers, that means you are assigning an int with value 0x01010101. But, what’s more, you are not assigning to the entire array, only the first 1/4 of it, again assuming 4 byte integers.

You can’t do what you want with memset. Use a for loop instead.