- 35-
} /* while(read_line) */
} /* while (1) */
}
/* WARNING */
/* this function is experimental. I don't know yet if it works */
/* correctly or not. Use Steven's readline() function to have something robust.*/
/* rcv_line is my function readline(). Data is read from the socket when */
/* needed, but not byte after bytes. All the received data is read. */
/* This means only one call to recv(), instead of one call for each received byte. */
/* You can set END_CHAR to whatever means endofline for you. (0x0A is \n)*/
/* read_lin returns the number of bytes returned in line_to_return */
/* Hàm có chức năng đọc dữ liệu từ socket*/
int read_line(int newSd, char *line_to_return) {
static int rcv_ptr=0;
static char rcv_msg[MAX_MSG];
static int n;
int offset;
offset=0;
while(1) {
if(rcv_ptr==0) {
/* read data from socket */
memset(rcv_msg,0x0,MAX_MSG);
/* init buffer */
n = recv(newSd, rcv_msg, MAX_MSG, 0); /* wait for data */
if (n<0) {
perror(" cannot receive data ");
return
ERROR;
} else if (n==0) {
printf(" connection closed by client\n");
close(newSd);
return
ERROR;
}
}
/* if new data read on socket OR if another line is still in buffer */
/* copy line into 'line_to_return' */
while(*(rcv_msg+rcv_ptr)!=END_LINE && rcv_ptr<n) {
memcpy(line_to_return+offset,rcv_msg+rcv_ptr,1);
offset++;
rcv_ptr++;
}
/* end of line + end of buffer => return line */
if(rcv_ptr==n-1) {
/* set last byte to END_LINE */
*(line_to_return+offset)=END_LINE;
rcv_ptr=0;
return ++offset;
}
