Simple C application that reads file and print it as HEX,

Hex

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int lineBreaker = 12;
void printInHex(char* file, int length){
    char* temp = (char*)malloc(lineBreaker+1);
    memset(temp,0,lineBreaker+1);
    for (int i=0;i<length;i++){
        printf("0x%02x ",file[i]);
        if(file[i]>='0')
            temp[(i%lineBreaker)-1] = file[i];
        else
            temp[(i%lineBreaker)-1] = '*';
        if(i%lineBreaker==0)
            printf("%s%c \n",temp,file[i]);
    }
    printf("\n");
}
int main(int argc,char** argv){
    if(argc>=2){
        if(argc==3) lineBreaker = atoi(argv[2]);
        FILE* target = fopen(argv[1],"rb");
        if (target)
        {
            fseek (target, 0, SEEK_END);
            int length = ftell (target);
            fseek (target, 0, SEEK_SET);
            char* buffer = (char*)malloc (length);
            if (buffer)
            {
                fread (buffer, 1, length, target);
            }
            fclose (target);
            printInHex(buffer, length);
            free(buffer);
        }else{
            printf("Can't read the file.");
        }
    }else{
        printf("Usage: hex filename.\n");
    }
    return 0;
}