datatransmitmodule.c

自己写的一个ftp client

#include"global.h"
#include"datatransmitmodule.h"

int readlist(int fd , struct linebuf *lbuf ){
	int hasreadinoneread;
	char *buf=lbuf->buf;
	int size=lbuf->size;
	int totalread=0;
	while( hasreadinoneread!=0 ){
		if(size<=1){
			char *tmp=lbuf->buf;
			int t=lbuf->size;
			lbuf->buf=xrealloc(buf,t*2);
			printf("realloc happened!\n");
			lbuf->size=t*2;
			buf=(lbuf->buf-tmp)+buf;
			size=size+t;
		}
		hasreadinoneread=read( fd , buf , size );
		printf("hasreadinoneread:%d\n",hasreadinoneread);
		//insert some protection for badread later here!
		size-=hasreadinoneread;
		buf+=hasreadinoneread;
		totalread+=hasreadinoneread;
	}
	*( (char*)buf+1 )='\0';
	printf("totalread:%d lbuf->size:%d\n",totalread,lbuf->size);
	return totalread;
}

int readdata(int fd ,char *pathname){
	int flag;
	int hasreadinoneread;//initialization just make we can enter the while(){}
	char *buf=malloc( sizeof(char)*4096 );
	int w;
	if(buf==NULL){
		perror("readdata()->malloc for buf error\n");
	}
	int totalread=0;
	int filefd=open( pathname , O_WRONLY|O_CREAT , S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
	if(filefd==-1){
		perror("open file error!\n");
	}
	while( hasreadinoneread ){
		hasreadinoneread=read( fd , (void  *)buf , 4096 );
		if(hasreadinoneread==-1){
			perror("readdata()->read from network\n");
		}
		//insert some protection for badread later here!
		if(hasreadinoneread!=0){
			if((w= write( filefd , (void *)buf , hasreadinoneread )) ==-1){
				perror("readdata()->write to file\n");
			}
		}else{		//I think a EOF should be inserted here! or maybe the close operation do this automatically
			close(filefd);
			printf("readdata()->after close(filefd)\n");
		}
		printf("read:%d  write:%d\n",hasreadinoneread,w);
		totalread+=hasreadinoneread;
	}
	*( (char*)buf+1 )='\0';
	printf("file:%s has been read, %d bytes finished!\n",pathname,totalread);
	free(buf);
	printf("readdata()->after free(buf)\n");
	return totalread;
}

int writedata( int fd , char * pathname){
	int flag;
	int hasreadinoneread=1;//initialization just make we can enter while(){}
	char *buf=malloc( sizeof(char)*4096 );
	int totalwrite=0;
	if(buf==NULL){
		perror("writedata()->malloc for buf error");
	}
	int filefd=open( pathname , O_RDONLY );
	if(filefd==-1){
		printf( "can't open %s." , pathname );
		perror( "\n" );
	}
	while( hasreadinoneread ){
		hasreadinoneread=read( filefd , (void *)buf , 4096 );
		if( hasreadinoneread==-1 ){
			perror( "writedata()->read() from file" );
		}
		if( hasreadinoneread!=0 ){
			if( write( datafd , (void *)buf , hasreadinoneread )==-1 ){
				perror( "writedata()->write() to network" );
			}
		}else{
			close(datafd);
			close(filefd);
		}
		totalwrite+=hasreadinoneread;
	}
	printf( "file:%s has been writen, %d bytes has finished!\n" , pathname , totalwrite );
	return totalwrite;
}