OEOE.MOE

reg bufferSize = 1024;
u8 *buffer = malloc(bufferSize); // 1kb buffer

reg readTotal = 0;

while (1) {
    reg read  = fread(file, &buffer[readTotal], bufferSize - readTotal);
    if (read <= 0) {
        break; // exit reading loop when done
    }

    readTotal += read;
    if (readTotal >= bufferSize) { // if overflow

        bufferSize *= 2; // grow buffer

        u8 *bufferNew = realloc(buffer, bufferSize);
        if (bufferNew) {
            buffer = bufferNew;
        } else {
            // failed to allocate new buffer
            free(buffer);
            return;
        }
    }
}

/* (optional) truncate buffer */
if (bufferSize > readTotal) {
    buffer = realloc(buffer, readTotal);
}