main.c

自己写的一个ftp client

#include"global.h"
#include"controlmodule.h"
#include"parser.h"

//////////////////////////////////////////////////////
void * xrealloc( void *ptr , int size){
	void *p=realloc(ptr,size);
	if(p==NULL){
		perror("realloc() failed!\n");
		exit(1);
	}
	printf("realloc happened!\n");
	return p;
}

void readline(int fd,struct linebuf *lbuf){
	char *start;	//used for recording the start of lastest line
	char *buf=lbuf->buf;
	start=buf;
	int size=lbuf->size;
	char c='a';
	int count=0;	//the total amount that has been read
	while( c!='\n' ){
//		printf("first read\n");
		if( read( fd , &c , sizeof(char) ) == -1){
			perror("read()\n");
		}
		if( (size--)<=1 ){
			char * tmp=lbuf->buf;
			size+=lbuf->size;
			lbuf->size*=2;	//maybe to fast!!!
			lbuf->buf=xrealloc( lbuf->buf , lbuf->size );
			start= (lbuf->buf-tmp)+start; 
			buf= (lbuf->buf-tmp)+buf;
		}
		count++;
		*(buf++)=c;
	}
	*buf='\0';
	if( *(start+3)=='-' ){//then enter the status that server while send more than one line.
//		printf("enter get more than one lines\n");
		char n1=*start;
		char n2=*(start+1);
		char n3=*(start+2);
//		printf("%c%c%c\n",n1,n2,n3);
		c='a';
		start=buf;
		while( c!='\n' ){
//			printf("count:%d %c before read()\n",count,c);
			if( read( fd , &c ,sizeof(char) ) ==-1){
				perror("read() in more than oneline precess\n");
			}
			if( (size--)<=1 ){
				char * tmp=lbuf->buf;
				size+=lbuf->size;
				lbuf->size*=2;	//maybe to fast!!!
				lbuf->buf=xrealloc( lbuf->buf , lbuf->size );
				start= (lbuf->buf-tmp)+start; 
				buf= (lbuf->buf-tmp)+buf;
			}
			count++;
			*(buf++)=c;
//			printf("count:%d %cafter read()\n",count,c);
			if(c=='\n'){
				if( *start==n1 && *(start+1)==n2 && *(start+2)==n3 && *(start+3)==' ' ){
					break;
				}
				start=buf;
//				printf("start:%c and address:%d\n",*start,start);
				c='a';
			}
		
		}
	}	
	printf("count:%d lbuf->size:%d\n",count,lbuf->size);
		
}
void getline(char *buf){
	char c;
	scanf("%c",&c);
	while(c!='\n'){
		*(buf++)=c;
		scanf("%c",&c);
	}
	*buf='\0';
}

struct linebuf* inilinebuf(int size){
	struct linebuf *tmp=malloc( sizeof(struct linebuf) );
	tmp->size=size;
	tmp->buf=malloc( size );
	if( tmp==NULL && tmp->buf==NULL ){
		perror("malloc failed!\n");
		exit(1);
	}
	return tmp;
}

void freelinebuf(struct linebuf* lbuf){
	free(lbuf->buf);
	free(lbuf);
}

	
int main(int argc,char **argv){
/////////////////////do some initialization for the global variable//////////////////////////////
	status=DISCONNECTED;
	username=malloc( sizeof(char)*10 );
	remoteaddr=malloc( sizeof(char)*16 );
	remotecwd=malloc( sizeof(char)*30 );
	remoteostype=malloc( sizeof(char)*20 );
	transmittype=malloc( sizeof(char) );
	if(username==NULL||remoteaddr==NULL||remotecwd==NULL||remoteostype==NULL){
		perror("malloc failed!\n");
	}
	
//do sth. about argument

	//get user command
	char *command=malloc( sizeof(char)*100 );
	char c;
	char *p=command;
	int tag;
	printf("ftp:>");
	while(1){
		tag=0;
		scanf("%c",&c);
		while(c!='\n'){
			*(command+tag++)=c;
		//	printf("%c",c);
			scanf("%c",&c);
		}
		*(command+tag)='\0';
		printf("%d\n",(int)*p);
		for(;*p!='\0';p++){
			printf( "%d ",(int)*p );
		}
		printf("\n%s\n",command);
		for(int i=0;i<=tag;i++){
			printf("%d ",(int)*(command+i));
		}
		printf("\n");
		parser(command); //parse the user command here!
		printf("ftp:>");
	}
	exit(0);
}