TurboC2.0-;gt;文件的拷贝、删除、加密

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/******************文件操作函数库*************************
设计: ahu
主页: web.1816.net/~program
               

*********************************************************/



#include <stdio.h>

#include <dos.h>



int file_copy(char*old_fname,char*new_fname);   /*文件拷贝*/

int file_kill(char *filename);        /*文件删除*/

int file_password(char*old_file_name,char*new_file_mame,long password);
     /*文件加密（password为密码），加解密采用相同的密锁*/



int file_copy(char*old_fname,char*new_fname)

{
FILE*in,*out;
char ch;
if ((in=fopen(old_fname,"r"))==NULL) return(1);
if ((out=fopen(new_fname,"w"))==NULL) { fclose(out); return(2);}
ch=fgetc(in);
while (!feof(in))
{
   fputc(ch,out);
   ch=fgetc(in);
}
fclose(in);
fclose(out);
return(0);

}



int file_kill(char *filename)

{
FILE *fp;
fp=fopen(filename,"w");
if(fp==NULL) return(1);
fclose(fp);
unlink(filename);
return(0);

}



int file_password(char *old_file_name,char*new_file_mame,long password)

{
FILE *fp1,*fp2;
char c,ch;  
fp1=fopen(old_file_name,"rb");
fp2=fopen(new_file_mame,"wb");
if(fp1==NULL) return(1);
if(fp2==NULL) { fclose(fp1); return(2); }
srand(password);
ch=fgetc(fp1);
while(! feof(fp1))
{
   c=rand();
   ch=ch^c;
   fputc(ch,fp2);
   ch=fgetc(fp1);
}
fclose(fp1);
fclose(fp2);
return(0);

}

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