位示图(操作系统实验)

位示图

/*************************************************************************
	> File Name: test2.cpp
	> Author: kwh 
	> Mail: 
	> Created Time: Fri Jun 12 17:33:55 2020
 ************************************************************************/

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <cstdio>
using namespace std;

const int MAX = 100;

int map[MAX][MAX];

typedef struct file {
    char fileName[30];
    int length, start;
} file;

file File[60];
int line, column;
int fileTotalNum = 0;

void mapInit() {
    printf("Please enter rows and columns:");
    cin >> line >> column;
    for (int i = 0; i < line; i++) {
        for (int j = 0; j < column; j++) {
            map[i][j] = 0;
            cout << ' ' << map[i][j] << ' ';
        }
        cout << '\n';
    }
}

void allocation (int fileNum) {
    int length = File[fileNum].length;
    int b[60];
    int x = 0;
    for (int i = 0; i < line; i++) {
        for (int j = 0; j < column; j++) {
            if (map[i][j] == 0) {
                b[x] = i * line + j;
                x++;
                if (x == length) break;
            } else x = 0;
        }
        if (x == length) break;
    }
    if (length > x) {
        cout << "There is not enough space to allocate.\n";
    } else {
        File[fileNum].start = b[0];
        for (int i = 0; i < x; i++) {
            int x1 = b[i] / column;
            int y1 = b[i] % column;
            map[x1][y1] = 1;
        }
    }
    for (int i = 0; i < line; i++) {
        for (int j = 0; j < column; j++) {
            cout << ' ' << map[i][j] << ' ';
        }
        cout << '\n';
    }
}

void recovery(char s[0]) {
    int cnt = -1;
    for (int i = 0; i < fileTotalNum; i++) {
        if (strcmp(s, File[i].fileName) == 0) {
            cnt = i;
            break;
        }
    }
    if (cnt == -1) {
        cout << "This file is not available, please re-enter!\n";
    }
    int start = File[cnt].start;
    int length = File[cnt].length;
    for (int i = start; i < start + length; i++) {
        int x1 = i / column;
        int y1 = i % column;
        map[x1][y1] = 0;
    }
    for (int i = cnt + 1; i < fileTotalNum; i++) {
        strcpy(File[i - 1].fileName, File[i].fileName);
        File[i - 1].start = File[i].start;
        File[i - 1].length = File[i].length;
    }
    cout << "Recycling success\n";
    for (int i = 0; i < line; i++) {
        for (int j = 0; j < column; j++) {
            cout << ' ' << map[i][j] << ' ';
        }
        cout << '\n';
    }
}

void allocation() {
    cout << "Please enter the file name\n";
    cin >> File[fileTotalNum].fileName;
    cout << "Please enter the length of the file\n";
    cin >> File[fileTotalNum].length;

    allocation(fileTotalNum);
    fileTotalNum++;
}

void recoveryInit() {
    char name[30];
    cout << "Please enter the recycle file name\n";
    cin >> name;
    recovery(name);
    fileTotalNum--;
}

void showDir() {
    if (fileTotalNum == 0) cout << "Empty file!\n";
    else {
        for (int i = 0; i < fileTotalNum; i++) {
            cout << "fileName: \n" << File[i].fileName;
            cout << "The start position: \n" << File[i].start;
            cout << "The file length: \n" << File[i].length;
        }
    }
    for (int i = 0; i < line; i++) {
        for (int j = 0; j < column; j++) {
            cout << ' ' << map[i][j] << ' ';
        }
        cout << '\n';
    }
}

int main() {
    int mode;
    mapInit();
    while (1) {
        cout << "1 creates the file; 2 is the recovered file; 3 shows all files\n";
        cout << "Please select operation mode\n";
        scanf("%d", &mode);
        switch (mode) {
            case 1: allocation(); break;
            case 2: recoveryInit(); break;
            case 3: showDir(); break;
            default: cout << "Error!\n"; exit(-1);
        }
    }
    return 0;
}

运行结果