pokediamond/arm9/lib/MSL_C/src/rand.c

#include "code32.h"
#include "stdlib.h"

static unsigned long int random_next = 1;

int rand(void) {
    random_next = random_next * 1103515245 + 12345;
    return ((random_next >> 16) & 0x7fff);
}

void srand(unsigned int seed) {
    random_next = seed;
}