操作系统——文件合并

编程实现文件的合并

 1 include<stdio.h>
 2 #include<unistd.h>
 3 //
 4 #include<fcntl.h>
 5 void main()
 6 {
 7     int fd,fd1,fd2,bytes,bytes1,bytes2;
 8     char ch[513],ch1[513],ch2;
 9     if((fd=open("1.txt",O_RDONLY))!=-1)
10     {
11         while((bytes=read(fd,ch,512))==512)
12         {
13             ch[bytes]='\0';
14         }
15         if(bytes<512)
16         {
17             ch[bytes]='\0';
18         }
19        printf("源文件1内容\n");
20        printf("%s",ch);
21         close(fd);
22            if((fd2=open("3.txt",O_WRONLY))!=-1)
23        {
24                 while((bytes2=write(fd2,ch,bytes))==bytes)
25               {
26                  ch[bytes2]='\0';
27                  close(fd2);
28             }
29                       
30        }
31 
32               else
33        {
34               printf("ERROR:file open failure!\n目标写入文件未找到!！\n");
35        }
36     
37     close(fd2);
38     close(fd1);
39     }
40     else
41     {
42         printf("ERROR:file open failure!\n源文件1未找到!\n");
43 
44     }
45 
46           if((fd1=open("2.txt",O_RDONLY))!=-1)
47         {
48 /*
49        printf("源文件2内容\n");
50        while((bytes1=read(fd1,ch1,512))==512)
51         {
52             ch1[bytes1]='\0';
53         }
54         if(bytes1<512)
55         {
56             ch1[bytes1]='\0';
57         }
58        printf("%s",ch1);
59 */
60     
61            if((fd2=open("3.txt",O_APPEND|O_WRONLY))!=-1)
62             {
63                          while((read(fd1,&ch2,1))==1)
64                {
65                     write(fd2,&ch2,1);
66               }
67 
68            }
69                         else
70            {
71                  printf("ERROR:file open failure!\n目标写入文件未找到!！\n");
72            }
73            close(fd2);
74        }
75     else
76     {
77         printf("ERROR:file open failure!\n源文件2未找到!\n");
78 
79     }
80 
81 close(fd1);
82 }

结果显示；