20191317王鹏宇MyOD

Linux MyOD

---

实践内容：MyOD：
代码：
20191317wpy.h

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define INPUT_FILE "20191317wpy.txt"
void myod(char transform[],int num);

---

main.c

#include "20191317wpy.h"

int main()
{
    char transform[1000]={0};
    char filename[128]={0};
    int num = 0;
    int n=0;
    char c;

    FILE *fp;  
    /*printf("file name: 
");
    scanf("%s",&filename);   */
    fp = fopen(INPUT_FILE,"r");
    fread(transform,1000,sizeof(char),fp);
    while (transform[n]!=0)
    {
        num++;
        n++;
    }
    printf("%d",num);
    myod(transform,num);
    return 0;
}

---

myod.c

#include "20191317wpy.h"

void myod(char transform[],int num)
{
    int count_1 = 0;
    int count_2 = 0;
    int i = 0;
    int flag = 0;
    int m = 1;
    int judge = 1;
    char tmp[3];
    while (1)
    {
        printf("%07o",count_1);
        printf("        ");
        for ( count_2 = 0; count_2 < 4; count_2++)
        {
            for (i = 3; i >= 0 ; i--)
            {
                tmp[i] = transform[m*4-1-i];
            }
            for ( i = 0; i <= 3; i++)
            {
                printf("%02x",tmp[i]);
                if (tmp[i] == 0)
                {
                    flag = 1;
                }
                else if (flag == 1 && i == 3)
                {
                    judge++;
                    printf("
");
                    printf("          ");
                    for ( i = count_1; i < num+1; i++)
                    {
                        printf("%c   ",transform[i]);
                    }
                    printf("\n");
                    printf("
");
                    printf("%07o
",num);
                    return;
                }
            }
            printf("        ");
            m++;
        }
        printf("
");
        printf("          ");
        for ( i = count_1; i < count_1+16; i++)
        {
            printf("%c   ",transform[i]);
        }
        printf("
");
        count_1=count_1+16;
    }
}

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动态库制作Makefile
Makefile

main2: libmymath.so include/20191317wpy.h
	gcc src/main.c -o bin/main2 -I/home/wpy/桌面/testmyod/include -Llib -lmymath
	

libmymath.so: myod2.o 
	gcc -shared -o lib/libmymath.so lib/myod2.o

myod2.o: src/myod.c include/20191317wpy.h
	gcc -fPIC -c src/myod.c -I/home/wpy/桌面/testmyod/include -o lib/myod2.o

clear:
		rm lib/*.o
start:
		export LD_LIBRARY_PATH=lib
		bin/main2

---

静态库制作makefile

main: libtestmath.a include/20191317wpy.h
	gcc src/main.c -o bin/main -I/home/wpy/桌面/testmyod/include -Llib -ltestmath

libtestmath.a: myod.o 
	ar rcvs -o lib/libtestmath.a lib/myod.o 

myod.o: src/myod.c include/20191317wpy.h
	gcc -c src/myod.c -I/home/wpy/桌面/testmyod/include -o lib/myod.o

clear:
		rm lib/*.o
start:
		bin/main

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实践截图：

可以从输出结果看出，od -tx -tc 20191317.txt指令与我的make指令输出结果并没有明显差异，几乎完全相同。下图是20191317.txt文件的内容：

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实践内容：静态库制作：
主要指令有：

gcc -c src/myod.c -I/home/wpy/桌面/testmyod/include -o lib/myod.o
ar rcvs -o lib/libtestmath.a lib/myod.o 
gcc src/main.c -o bin/main -I/home/wpy/桌面/testmyod/include -Llib -ltestmath

---

实践截图：

---

动态库制作：
主要指令：

gcc -fPIC -c src/myod.c -I/home/wpy/桌面/testmyod/include -o lib/myod2.o
gcc -shared -o lib/libmymath.so lib/myod2.o
gcc src/main.c -o bin/main -I/home/wpy/桌面/testmyod/include -Llib -ltestmath

---

实践截图：

遇到问题：：

主要是在编写myod代码是遇到较多问题，如果不参考他人的代码，自己从零开始写还是比较困难，以后还是需要多加练习这一薄弱环节。其中问题比较严重的有，缓冲区溢出，这是在将文本文件中的字符提取到字符串数组中遇到的，修改了一下提取字符的代码才解决，还有就是如何打印一行16进制转化结果，隔一行ascii码，这里我采取的是利用printf可以直接打印16进制字符不用转换的方法，取了个巧，但是也算解决了这个问题。还有就是openeuler系统中安装中文环境，实在是太麻烦，在安装fcitx输入法时，各种依赖缺失，安装完一个又会提醒另一个，套来套去就是无法安装成功，所以最终我还是放弃了在openeuler系统中输出中文的方法。毕竟不是很需要在虚拟机中输出中文。