13-3.c

本书是单片机系列教材

/*13-3.c*/
#include<dos.h>
#include<stdio.h>
#include<string.h>
/* 开始修改为固定返回符00H */
main()
{
	char errorkkj[35],filename[20],*ptr, *data_all;
static char readerror[]="读文件失败!";
  FILE *stream;
int length;
printf("请输入需要加密的文本文件名:");
gets (filename);
stream=fopen(filename,"rd+"); /* 打开二进制文本文件 */
if (stream=NULL)
		 {
		   printf ("007");
		   printf ("007");
		   strcpy (errorkkj, readerror);
		   strcat (errorkkj, filename);
		   printf ("%s",errorkkj);
		   printf("\007");
		  }
else
{
  fseek(stream,2,SEEK_END);
  length=ftell(stream);
data_all=(char *)malloc((unsigned)length,sizeof(char));
if(!data_all);
{
 printf("出现错误，请检查后再运行!");
 exit(1);
}
rewind(stream);
while(!feof(stream))  /* 修改为返回符00H */
fscanf(stream," [\x00]",data_all);
while(ptr=strrchr(data_all,'\n')) strnset(ptr,'\x00',1);
}
rewind(stream);
fwrite(data_all,1,length,stream);
fclose(stream);
	}