readline.c

this gives details of the network programming

#include <stdio.h>	/* standard C i/o facilities */
#include <unistd.h>

/* readline - from the Stevens book (Unix Network Programming) */

int
readline(int fd, void *vptr, int maxlen)
{
	int	n, rc;
	char	c, *ptr;

	ptr = vptr;
	for (n = 1; n < maxlen; n++) {
		if ( (rc = read(fd, &c, 1)) == 1) {
			*ptr++ = c;
			if (c == '\n')
				break;
		} else if (rc == 0) {
			if (n == 1)
				return(0);	/* EOF, no data read */
			else
				break;		/* EOF, some data was read */
		} else
			return(-1);	/* error */
	}

	*ptr = 0;
	return(n);
}
/* end readline */


int writeline( int fd, char *s ) {

  int res;

  res = write(fd,s,strlen(s));
  if (res!=strlen(s))
    return(-1);

  if (2!=write(fd,"\r\n",2)) 
    return(-1);
    
  return(res+2);
}