#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;}