Linux下C语言编程--文件的操作(源代码)

freshman01

昨晚通宵到早上五点做好的
学lINUX以来写的第一个小程序
大家有什么意见尽管说,什么都可以说,
小弟感激不尽

1. 
   
2. #include<stdio.h>
   
3. #include<stdlib.h>
   
4. #include<string.h>
   
5. #include<fcntl.h>
   
6. #include<unistd.h>
   
7. #include<sys/stat.h>
   
8. #include<sys/dir.h>
   
9. #include<dirent.h>
   
10. #include <sys/types.h>
    
11. #define s 100
    
12. main()
    
13. {
    
14.   char copybuf[s],pastebuf[s],copyname[s];
    
15.    int len=0,tag=0,cord,i;
    
16.   void treedisplay();
    
17.   void treecreat();
    
18.   void filecreatopen();
    
19.   void fileread(char pathname[]);
    
20.   void filewrite(char pathname[]);
    
21.   void treeopen();
    
22.   void treeback();
    
23.   long treefilecopy(char copybuf[],char copyname[]);
    
24.   void treefilepaste(int len,char pastebuf[],char copyname[]);
    
25.   void treedelete();
    
26.   void filedelete();
    
27.   void treefileproperty();
    
28.   void displayproperty();
    
29.   void modifypurview(char pathname[]);
    
30.   void treefilerename();
    
31.   void changesize();
    
32.   
    
33.   do {printf("\n          mainmenu         \n");
    
34.       printf("    1     tree-display       \n");/*显示目录*/
    
35.       printf("    2     tree-creat         \n");/*目录创建*/
    
36.       printf("    3     file-creat/open    \n");/*打开文件进行读写*/
    
37.       printf("    4     tree-open          \n");/*改变当前目录*/
    
38.       printf("    5     tree-back          \n");/*返回上一级目录*/
    
39.       printf("    6     tree/file-copy     \n");
    
40.       printf("    7     tree/file-paste    \n");
    
41.       printf("    8     tree-delete        \n");
    
42.       printf("    9     file-delete        \n");
    
43.       printf("   10     tree/file-property \n");/*文件属性*/
    
44.       printf("   11     end                \n");
    
45.       printf("------------------------------\n");
    
46.       printf("input your choice(1-11)");
    
47.       scanf("%d",&cord);
    
48.       switch(cord)
    
49.         {case 1:{treedisplay();
    
50.                 }break;
    
51.          case 2:{treecreat();
    
52.                 }break;
    
53.          case 3:{filecreatopen();
    
54.                 }break;
    
55.          case 4:{treeopen();
    
56.                 }break;
    
57.          case 5:{treeback();
    
58.                 }break;
    
59.          case 6:{len=treefilecopy(copybuf,copyname); tag=1;
    
60.                  for(i=0;i<len;i++)pastebuf[i]=copybuf[i];
    
61.                 }break;
    
62.          case 7:{if(tag&&len)treefilepaste(len,pastebuf,copyname);
    
63.                  else   printf("paste failed\n");
    
64.                 }break;
    
65.          case 8:{treedelete();
    
66.                 }break;
    
67.          case 9:{filedelete();
    
68.                 }break;
    
69.          case 10:{treefileproperty();
    
70.                 }break;
    
71.          case 11:{system("clear");exit(0);
    
72.                 }break;
    
73.         }
    
74.     }while(cord<=11);
    
75. }
    
76. 
    
77. void treedisplay()
    
78. {
    
79. DIR *dir;char buf[s];
    
80. struct dirent *ent;
    
81. getcwd(buf,s);
    
82. dir=opendir(buf);
    
83. while((ent=readdir(dir))!=NULL)
    
84. puts(ent->d_name);
    
85. closedir(dir);
    
86. }
    
87. 
    
88. void treecreat()
    
89. {
    
90. int fd;char pathname[s];
    
91. do{
    
92. printf("new tree=");scanf("%s",pathname);
    
93. fd=mkdir(pathname,O_CREAT);
    
94. if(fd==-1)
    
95.         perror("creat failed,try again,the error");
    
96. else
    
97.         {chmod(pathname,0777);
    
98.         printf("creat success!\n");
    
99.         }
    
100. }while(fd==-1);
     
101. }
     
102. 
     
103. void filecreatopen()
     
104. {
     
105. int fd;char ch,choose,pathname[s];
     
106. printf("new/open file=");scanf("%s",pathname);
     
107. fd=open(pathname,O_CREAT|O_APPEND|O_RDWR);
     
108. if(fd==-1)
     
109.         {perror("filecreat/open failed,try again,the error");
     
110.         close(fd);return;
     
111.         }
     
112. else
     
113.         {chmod(pathname,0777);
     
114.         printf("creat/open success!\n");
     
115.         fileread(pathname);
     
116.         }
     
117. printf("\ninput the text?(y/n)");
     
118. scanf("%c",&choose);
     
119. scanf("%c",&choose);
     
120. 
     
121. if(choose=='y')filewrite(pathname);
     
122. fileread(pathname);
     
123. close(fd);
     
124. }
     
125. 
     
126. void fileread(char pathname[])
     
127. {
     
128. char ch;FILE *fp;
     
129. fp=fopen(pathname,"r");
     
130. ch=fgetc(fp);
     
131. while(ch!=EOF)
     
132.         {putchar(ch);
     
133.         ch=fgetc(fp);
     
134.         }
     
135. fclose(fp);
     
136. }
     
137. 
     
138. void filewrite(char pathname[])
     
139. {
     
140. char ch;FILE *fp;long where;
     
141. fp=fopen(pathname,"rb+");
     
142. printf("input the where of write=");
     
143. scanf("%ld",&where);
     
144. fseek(fp,where,SEEK_SET);
     
145. printf("'#' for the EOF,begin:\n");
     
146. ch=getchar();
     
147. while(ch!='#')
     
148.           {
     
149.           fwrite(&ch,1,1,fp);
     
150.         ch=getchar();
     
151.         }
     
152. fclose(fp);
     
153. }
     
154. 
     
155. void treeopen()
     
156. {
     
157. int fd;char pathname[s],buf[s];
     
158. system("ls -l");
     
159. printf("open tree=");scanf("%s",pathname);
     
160. fd=chdir(pathname);
     
161. if(fd==-1)
     
162.         {perror("treeopen failed,try again,the error");
     
163.          close(fd);return;
     
164.         }
     
165. else     {
     
166.          system("ls -l");
     
167.          getcwd(buf,s);
     
168.          printf("%s\n",buf);
     
169.          printf("treeopen success!\n");
     
170.          }
     
171. }
     
172. 
     
173. void treeback()
     
174. {
     
175. char buf[s];
     
176. chdir("..");
     
177. system("ls -l");
     
178. getcwd(buf,s);
     
179. printf("%s\n",buf);
     
180. }
     
181. 
     
182. long treefilecopy(char copybuf[],char copyname[])
     
183. {
     
184. struct stat buf;int fd;
     
185. long  size;/*off_t*/
     
186. system("ls -l");
     
187. printf("copy file/tree=");scanf("%s",copyname);
     
188. fd=open(copyname,O_RDONLY);
     
189. if(fd==-1)
     
190.         {perror("failed,try again,the error");
     
191.          return 0;
     
192.         }
     
193. stat(copyname,&buf);
     
194. size=buf.st_size;
     
195. read(fd,copybuf,size);
     
196. return  size;
     
197. }
     
198. 
     
199. void treefilepaste(int len,char pastebuf[],char copyname[])
     
200. {int fd;char pastename[]={"re-"};
     
201. strcat(pastename,copyname);
     
202. fd=open(pastename,O_CREAT|O_APPEND|O_RDWR);
     
203. if(fd==-1)
     
204.         {perror("failed,try again,the error");
     
205.          return;
     
206.         }
     
207. write(fd,pastebuf,len);
     
208. system("ls -l");
     
209. }
     
210. 
     
211. void treedelete()
     
212. {
     
213. int fd;char pathname[s];
     
214. system("ls -l");
     
215. printf("delete tree=");scanf("%s",pathname);
     
216. fd=rmdir(pathname);
     
217. if(fd==-1)
     
218.         {perror("treedelete failed,try again,the error");
     
219.          return;
     
220.         }
     
221. else     {
     
222.          system("ls -l");
     
223.          printf("treedelete success!\n");
     
224.          }
     
225. }
     
226. 
     
227. void filedelete()
     
228. {
     
229. int fd;char pathname[s];
     
230. system("ls -l");
     
231. printf("delete file=");scanf("%s",pathname);
     
232. fd=unlink(pathname);
     
233. if(fd==-1)
     
234.         {perror("filedelete failed,try again,the error");
     
235.          return;
     
236.         }
     
237. else     {
     
238.          system("ls -l");
     
239.          printf("filedelete success!\n");
     
240.          }
     
241. }
     
242. 
     
243. void treefileproperty()
     
244. {int cord;char choose;
     
245. do { printf("\n          treefileproperty \n");
     
246.       printf("    1     display-property   \n");
     
247.       printf("    2     tree/file-rename   \n");
     
248.       printf("    3     file-chsize        \n");
     
249.       printf("    4     back mainmenu      \n");
     
250.       printf("------------------------------\n");
     
251.       printf("input your choice(1-4)");
     
252.       scanf("%d",&cord);
     
253.       switch(cord)
     
254.         {case 1:{displayproperty();
     
255.                 }break;
     
256.          case 2:{treefilerename();
     
257.                 }break;
     
258.             case 3:{changesize();
     
259.                 }break;
     
260.          case 4:{system("clear");return;
     
261.                 }break;
     
262.             }
     
263.     }while(cord<=3);
     
264. }
     
265. 
     
266. void displayproperty()
     
267. {
     
268. struct stat buf;
     
269. mode_t mode;
     
270. int fd;char pathname[s],choose;
     
271. system("ls -l");
     
272. printf("file/tree=");scanf("%s",pathname);
     
273. fd=open(pathname,O_RDWR);
     
274. if(fd==-1)
     
275.         {perror("failed,try again,the error");
     
276.          return;
     
277.         }
     
278. stat(pathname,&buf);
     
279. mode=buf.st_mode;
     
280. printf("%-10s","mode:");
     
281. printf("%10s","read");printf("%10s","write");
     
282. printf("%10s","execute\n");printf("%10s","all user");
     
283. if((mode&0400)==S_IRUSR)printf("%10s","true");
     
284. else printf("%10s","false");
     
285. if((mode&0200)==S_IWUSR)printf("%10s","true");
     
286. else printf("%10s","false");
     
287. if((mode&0100)==S_IXUSR)printf("%10s","true\n");
     
288. else printf("%10s","false\n");
     
289. printf("%10s","group");
     
290. if((mode&040)==S_IRGRP)printf("%10s","true");
     
291. else printf("%10s","false");
     
292. if((mode&020)==S_IWGRP)printf("%10s","true");
     
293. else printf("%10s","false");
     
294. if((mode&010)==S_IXGRP)printf("%10s","true\n");
     
295. else printf("%10s","false\n");
     
296. printf("%10s","other user");
     
297. if((mode&04)==S_IROTH)printf("%10s","true");
     
298. else printf("%10s","false");
     
299. if((mode&02)==S_IWOTH)printf("%10s","true");
     
300. else printf("%10s","false");
     
301. if((mode&01)==S_IXOTH)printf("%10s","true\n");
     
302. else printf("%10s","false\n");
     
303. printf("size:%ld\n",buf.st_size);
     
304. printf("BLK size:%ld\n",buf.st_blksize);
     
305. 
     
306. printf("modify the purview?(y/n)");
     
307. scanf("%c",&choose);scanf("%c",&choose);
     
308. if(choose=='y')modifypurview(pathname);
     
309. }
     
310. 
     
311. void modifypurview(char pathname[])
     
312. {
     
313. char choose;int c=0;
     
314. printf("all user read?(y/n)");
     
315. scanf("%c",&choose);scanf("%c",&choose);
     
316. if(choose=='y'){c=c+0400;chmod(pathname,c);}
     
317. printf("all user write?(y/n)");
     
318. scanf("%c",&choose);scanf("%c",&choose);
     
319. if(choose=='y'){c=c+0200;chmod(pathname,c);}
     
320. printf("all user execute?(y/n)");
     
321. scanf("%c",&choose);scanf("%c",&choose);
     
322. if(choose=='y'){c=c+0100;chmod(pathname,c);}
     
323. printf("group read?(y/n)");
     
324. scanf("%c",&choose);scanf("%c",&choose);
     
325. if(choose=='y'){c=c+040;chmod(pathname,c);}
     
326. printf("group write?(y/n)");
     
327. scanf("%c",&choose);scanf("%c",&choose);
     
328. if(choose=='y'){c=c+020;chmod(pathname,c);}
     
329. printf("group execute?(y/n)");
     
330. scanf("%c",&choose);scanf("%c",&choose);
     
331. if(choose=='y'){c=c+010;chmod(pathname,c);}
     
332. printf("other user read?(y/n)");
     
333. scanf("%c",&choose);scanf("%c",&choose);
     
334. if(choose=='y'){c=c+04;chmod(pathname,c);}
     
335. printf("other user write?(y/n)");
     
336. scanf("%c",&choose);scanf("%c",&choose);
     
337. if(choose=='y'){c=c+02;chmod(pathname,c);}
     
338. printf("other user execute?(y/n)");
     
339. scanf("%c",&choose);scanf("%c",&choose);
     
340. if(choose=='y'){c=c+01;chmod(pathname,c);}
     
341. if(!c)chmod(pathname,c);
     
342. displayproperty();
     
343. }
     
344. 
     
345. void treefilerename()
     
346. {
     
347. char oldname[s],newname[s];int fd;
     
348. system("ls -l");
     
349. printf("old name=");scanf("%s",oldname);
     
350. printf("new name=");scanf("%s",newname);
     
351. fd=rename(oldname,newname);
     
352. if(fd==-1)
     
353.         {perror("rename failed,try again,the error");
     
354.         return;
     
355.         }
     
356. else     {
     
357.          system("ls -l");
     
358.          printf("rename success!\n");
     
359.          }
     
360. }
     
361. 
     
362. 
     
363. void changesize()
     
364. {  int fd,size;char pathname[s];
     
365.    printf("change file=");scanf("%s",pathname);
     
366.    printf("change size=");scanf("%d",&size);
     
367.    fd=truncate(pathname, size);
     
368.    if(fd==-1)perror("failed,try again,the error");
     
369.    else    printf("success!\n");
     
370. }

复制代码

freshman01

用编译器能编译成功,可是它有很多警告,
怎么办?有影响吗?

下面是上面那个源程序的警告
chen.c:126: warning: type mismatch with previous implicit declaration
chen.c:121: warning: previous implicit declaration of `fileread'
chen.c:126: warning: `fileread' was previously implicitly declared to return `int'
chen.c:138: warning: type mismatch with previous implicit declaration
chen.c:120: warning: previous implicit declaration of `filewrite'
chen.c:138: warning: `filewrite' was previously implicitly declared to return `int'
chen.c:268: warning: type mismatch with previous implicit declaration
chen.c:255: warning: previous implicit declaration of `displayproperty'
chen.c:268: warning: `displayproperty' was previously implicitly declared to return `int'
chen.c:313: warning: type mismatch with previous implicit declaration
chen.c:309: warning: previous implicit declaration of `modifypurview'
chen.c:313: warning: `modifypurview' was previously implicitly declared to return `int'
chen.c:347: warning: type mismatch with previous implicit declaration
chen.c:257: warning: previous implicit declaration of `treefilerename'
chen.c:347: warning: `treefilerename' was previously implicitly declared to return `int'
chen.c:365: warning: type mismatch with previous implicit declaration
chen.c:259: warning: previous implicit declaration of `changesize'
chen.c:365: warning: `changesize' was previously implicitly declared to return `int'

freshman01

谁能帮我解释那些警告?

我英文不好

colored

你把函数声明放的main()以外就没有这些警告了

freshman01

最初由 colored 发表
你把函数声明放的main()以外就没有这些警告了

谢谢

我刚学LINUX
给我的源程序点意见啊

Andy84920

代码的可读性好差!

反正我不喜欢看这种乱代码.要写的清楚,多分几行.每个函数分开来.
还有最好用模块把它们分开来!

你看你函数的原形都在main中.去 看看C99比较好!

Andy84920

还请问楼主在LINUX下用的是集成开发环境还是GCC什么?

我们可以做好朋友,我是想搞LINUX下的C/C++编程的!有精力搞搞数据库开发!我用的是ANJUTA,说实话,还是新手对于LINUX,对编程还不能算什么水平!希望以后多交流!

freshman01

最初由 Andy84920 发表
代码的可读性好差!

反正我不喜欢看这种乱代码.要写的清楚,多分几行.每个函数分开来.
还有最好用模块把它们分开来!

你看你函数的原形都在main中.去 看看C99比较好!

谢谢

freshman01

最初由 Andy84920 发表
还请问楼主在LINUX下用的是集成开发环境还是GCC什么?

我们可以做好朋友,我是想搞LINUX下的C/C++编程的!有精力搞搞数据库开发!我用的是ANJUTA,说实话,还是新手对于LINUX,对编程还不能算什么水平!希望以后多交流!

我也刚学啊

Andy84920

我把你的代码把格式给调了一下.
有些我不懂.有些你的实现起来真的不好.
你看你一般用两个scanf("%c",&ch);这样的语句来处理一个字符与一个回车字符是吧?你还不来个函数来处理就行.
我会仔细分析一下你的程序的.我会把我改你的程序给你看的.
有不懂的还得指教!