A malloc written for the OS course in ÅA

mymem.c

#include <stdio.h>

int bitmap[20480];

int myalloc(int blocksize) {
        int i=0;                                                                        //counter
        int x=0;                                                                        //done
        int z=0;                                                                        //potential spot
        while (x==0) {
                if(i<20480) {                                                           //we're still in a valid range
                        if (bitmap[i]==0) {                                             //unallocated space
                                z++;
                                if (z==blocksize) {                                     //it fits!
                                        int j;
                                        for (j=i-blocksize;j<i;j++) {bitmap[j]=1;}      //allocate the space we need
                                        x=1;                                            //call it done.
                                        if (i-blocksize>-1) { return i-blocksize; } else { return 0; }
                                }
                        } else {z=0;}                                                   //didn't fit. :(
                        i++;
                } else {
                        x=1;
                        return -1;
                }
        }
}
int myfree(int pos, int blocksize) {
        for (pos;pos<blocksize;pos++) { bitmap[pos-1]=0; }
                return 1;               //I really don't know what to return, so I'll return a 1, because I like ones, they are cute.
                }
                tester(int x) {
                                if (x==-1) { printf("Shit went south\n"); }
                        }
                        main() {
                                tester(myalloc(9000));
                                tester(myalloc(2000));
                                tester(myalloc(9000));
                                tester(myfree(9000, 2000));
                                tester(myalloc(1500));
                                tester(myalloc(1500));          //fails 
                        }