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【C】 I/O库函数实现文件复制

作者: / 发布于2014/5/22/ 403

文件复制


	#include <string.h>
	//#include <strings.h>
	#include <stdio.h>
	#include <stdlib.h>
	#define BUFFER_SIZE 200
	long filesize(FILE *stream);
	int main(int argc,char **argv)
	{
	 FILE *from_fd;
	 FILE *to_fd;
	 int read_num,write_num;
	 long file_len = 0;
	 char buffer[BUFFER_SIZE];
	 //char *ptr;

	 if(argc != 3)
	 {
	 fprintf(stderr,"Usage:%s fromfile tofile\\n",argv[0]);
	 exit(EXIT_FAILURE);
	 }
	 if((from_fd = fopen(argv[1],"rb")) == NULL)
	 {
	 fprintf(stderr,"open %s error\\n",argv[1]);
	 exit(EXIT_FAILURE);
	 }
	 if((to_fd = fopen(argv[2],"wb")) == NULL)
	 {
	 fprintf(stderr,"open %s error\\n",argv[2]);
	 exit(EXIT_FAILURE);
	 }
	/*
	 fseek(from_fd,0L,SEEK_END);
	 file_len = ftell(from_fd);
	 fseek(from_fd,0L,SEEK_SET);
	*/
	 file_len = filesize(from_fd);
	 printf("from_file size is %ld\\n",file_len);
	 while(!feof(from_fd))
	 {
	 if((read_num = fread(buffer,sizeof(char),BUFFER_SIZE,from_fd)) < 0)
	 {
	 fprintf(stderr,"read error");
	 exit(EXIT_FAILURE);
	 }
	 if(BUFFER_SIZE > file_len)
	 {
	 if((write_num = fwrite(buffer,sizeof(char),file_len,to_fd)) != file_len)
	 {
	 fprintf(stderr,"write error");
	 exit(EXIT_FAILURE);
	 }
	 }
	 else
	 {
	 if((write_num = fwrite(buffer,sizeof(char),BUFFER_SIZE,to_fd)) != BUFFER_SIZE)
	 {
	 fprintf(stderr,"write error");
	 exit(EXIT_FAILURE);
	 }
	 file_len = file_len-BUFFER_SIZE;
	 }
	 bzero(buffer,BUFFER_SIZE);
	 }
	 fclose(from_fd);
	 fclose(to_fd);
	 exit(1);
	}

	long filesize(FILE *stream)
	{
	 long curpos,length;
	 curpos = ftell(stream);
	 fseek(stream,0L,SEEK_END);
	 length = ftell(stream);
	 fseek(stream,curpos,SEEK_SET);
	 return length;
	}

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