在不优化编译器的情况下减小 c 程序的大小

Question

我正在尝试用 c 语言制作一个扫雷游戏，它足够紧凑，可以放入二维码中，就像其他人对蛇所做的那样。就目前而言，我的程序需要大约 2.98 KB，目前为 58KB。

在我继续尝试让一些编译器魔法发生之前，我想知道如何改进我的代码预编译器。我的方法是否可行，它是否必须完全不同，或者如果不使用汇编，是否将扫雷程序安装到这么小的尺寸中是不可能的？我的代码可以在这里看到：

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

#define WIDTH 100
#define HEIGHT 100
#define BOMBS 799

#define KEY_UP 72
#define KEY_DOWN 80
#define KEY_LEFT 75
#define KEY_RIGHT 77

HANDLE wHnd;
HANDLE rHnd;

void SetGrid(int grid[WIDTH][HEIGHT])
{
    int bomb[2] = { abs(rand() % WIDTH-1) + 1,
                   abs(rand() % HEIGHT-1) + 1 };

    for (int i = 0; i < BOMBS; i++)
    {
        while (grid[bomb[0]][bomb[1]] < -1 || bomb[0] == 0 || bomb[1] == 0 || bomb[0] >= WIDTH-1 || bomb[1] >= HEIGHT-1)
        {
            bomb[0] = abs(rand() % WIDTH-1) + 1;
            bomb[1] = abs(rand() % HEIGHT-1) + 1;
        }

        grid[bomb[0]][bomb[1]] = -9;

        grid[bomb[0] + 1][bomb[1] + 1]++;
        grid[bomb[0] + 1][bomb[1]]++;
        grid[bomb[0]][bomb[1] + 1]++;
        grid[bomb[0] - 1][bomb[1] + 1]++;
        grid[bomb[0]][bomb[1] - 1]++;
        grid[bomb[0] + 1][bomb[1] - 1]++;
        grid[bomb[0] - 1][bomb[1] - 1]++;
        grid[bomb[0] - 1][bomb[1]]++;
    }
}

void ExpandGrid(int fullGrid[WIDTH][HEIGHT], int knownGrid[WIDTH][HEIGHT], int blankPos[2])
{
    int neighbors[8][2] = {{0,1}, {1,0}, {1,1},
                          {0,-1},        {-1,0},
                          {-1,-1},{-1,1},{1,-1}};
    int curTile[2];

    knownGrid[blankPos[0]][blankPos[1]] = 1;
    if(fullGrid[blankPos[0]][blankPos[1]] != 0) return;

    for(int blck = 0; blck < 8; ++blck)
    {
        curTile[0] = abs(blankPos[0]+neighbors[blck][0]);
        curTile[1] = abs(blankPos[1]+neighbors[blck][1]);
        if(curTile[0] > WIDTH-1 || curTile[1] > HEIGHT-1) continue;

        if(fullGrid[curTile[0]][curTile[1]] == 0 && knownGrid[curTile[0]][curTile[1]] == 0)
        {
            knownGrid[curTile[0]][curTile[1]] = 1;
            ExpandGrid(fullGrid, knownGrid, curTile);
        }
        else if(fullGrid[curTile[0]][curTile[1]] > 0) knownGrid[curTile[0]][curTile[1]] = 1;
    }
}

int main(void)
{

    SMALL_RECT windowSize = { 0, 0, WIDTH - 1, HEIGHT - 1 };

    COORD characterBufferSize = { WIDTH, HEIGHT };
    COORD characterPosition = { 0, 0 };
    SMALL_RECT consoleWriteArea = { 0, 0, WIDTH - 1, HEIGHT - 1 };

    CHAR_INFO consoleBuffer[WIDTH][HEIGHT];

    wHnd = GetStdHandle(STD_OUTPUT_HANDLE);
    rHnd = GetStdHandle(STD_INPUT_HANDLE);

    SetConsoleTitle("Minesweeper!");

    SetConsoleWindowInfo(wHnd, TRUE, &windowSize);

    srand((unsigned int)time(NULL));

    int startGrid[WIDTH][HEIGHT] = { 0 };
    int knownGrid[WIDTH][HEIGHT] = { 0 };
    SetGrid(startGrid);

    int startCoord[2] = {0, 0};
    int arrowPos[2] = {0, 0};

    ExpandGrid(startGrid, knownGrid, startCoord);

    while(1)
    {
        if (arrowPos[0] > WIDTH-1) arrowPos[0] = WIDTH-1;
        if (arrowPos[0] < 0) arrowPos[0] = 0;
        if (arrowPos[1] > HEIGHT-1) arrowPos[1] = HEIGHT-1;
        if (arrowPos[1] < 0) arrowPos[1] = 0;

        for (int x = 0; x < WIDTH; ++x)
        {
            for (int y = 0; y < HEIGHT; ++y)
            {

                if (knownGrid[x][y] == 1)
                {
                    if (startGrid[x][y] > 0)
                    {
                        consoleBuffer[x][y].Char.AsciiChar = '0' + startGrid[x][y];
                        consoleBuffer[x][y].Attributes = FOREGROUND_GREEN | FOREGROUND_INTENSITY;
                    }
                    else
                    {
                        consoleBuffer[x][y].Char.AsciiChar = 'o';
                        consoleBuffer[x][y].Attributes = (startGrid[x][y] < 0 ? FOREGROUND_RED : FOREGROUND_BLUE) | FOREGROUND_INTENSITY;
                    }
                }
                else
                {
                    consoleBuffer[x][y].Char.AsciiChar = 00;
                    consoleBuffer[x][y].Attributes = FOREGROUND_BLUE | FOREGROUND_INTENSITY;
                }

                if(arrowPos[0] == x && arrowPos[1] == y)
                {
                    consoleBuffer[x][y].Attributes = BACKGROUND_RED | BACKGROUND_BLUE | BACKGROUND_GREEN;
                }
            }
        }

        WriteConsoleOutputA(wHnd, consoleBuffer, characterBufferSize, characterPosition, &consoleWriteArea);

        switch(getch())
        {
            case KEY_UP:
                arrowPos[0]--;
                break;
            case KEY_DOWN:
                arrowPos[0]++;
                break;
            case KEY_LEFT:
                arrowPos[1]--;
                break;
            case KEY_RIGHT:
                arrowPos[1]++;
                break;
            case '\r':
                ExpandGrid(startGrid, knownGrid, arrowPos);
                break;
        }
    }
}

Answer 1

从 58K 减少到 3K 是一个很大的问题。

一些想法：

• 检查构建过程中链接的库，并将它们减少到最低限度；消除对您可以自己编写的库函数的调用。
• 可能使用较短的类型。你需要int吗？您可以使用字节 (char) 或 short 代替吗？
• 考虑您真正需要windows.h 和stdlib.h 的哪些部分。