/*Last Modified:   5-JUN-1992 12:47:23.78, By: MARK */
#include "vmsgopherd.h"

/*
 *******************************************************************
 * $Author: $
 * $Revision: $
 * $Date: $
 * $Source: $
 *******************************************************************
 */


/*
 * Read "n" bytes from a descriptor.
 * Use in place of read() when fd is a stream socket
 *
 * Returns the number of total bytes read.
 */

int
readn(fd, ptr, nbytes)
int fd;
char *ptr;
int nbytes;
{
	int nleft, nread;

	nleft = nbytes;
	while (nleft > 0) {
#ifdef MULTINET
		nread = socket_read(fd, ptr, nleft);
#endif

#ifdef WOLLONGONG
		nread = netread(fd, ptr, nleft);
#endif

#ifdef UCX
		nread = read(fd, ptr, nleft);
#endif

		if (nread < 0)
			return(nread);	/* error, return <0 */
		else if (nread == 0)	/* EOF */
			break;
	
		nleft 	-= nread;
		ptr 	+= nread;
	}
	return(nbytes - nleft);	/* return >= 0) */
}



/*
 * Write "n" bytes to a descriptor.
 * Use in place of write() when fd is a stream socket
 *
 * We return the number of bytes written
 */

int
writen(fd, ptr, nbytes)
int	fd;
char	*ptr;
int	nbytes;
{
	int nleft, nwritten;

	nleft = nbytes;
	while(nleft > 0) {
#ifdef MULTINET
		nwritten = socket_write(fd, ptr, nleft);
#endif

#ifdef WOLLONGONG
		nwritten = netwrite(fd, ptr, nleft);
#endif

#ifdef UCX
		nwritten = write(fd, ptr, nleft);
#endif

		if (nwritten <= 0)
			return(nwritten);	/* error */

		nleft	-= nwritten;
		ptr	+= nwritten;
	}
	return(nbytes - nleft);
}


/*
 * Writestring uses the writen and strlen calls to write a
 * string to the file descriptor fd.  If the write fails
 * a -1 is returned. Otherwise zero is returned.
 */

int
writestring(fd, stringptr)
int	fd;
char	*stringptr;
{
	int length;

	length = strlen(stringptr);
	if (writen(fd, stringptr, length) != length)
		return(-1);
	else
		return(0);
}


/*
 * Read a line from a descriptor.  Read the line one byte at a time,
 * looking for the newline.  We store the newline in the buffer,
 * then follow it with a null (the same as fgets(3)).
 * We return the number of characters up to, but not including,
 * the null (the same as strlen(3))
 */

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

	for (n=1; n < maxlen; n++) {
#ifdef MULTINET
		if ( (rc = socket_read(fd, &c, 1)) == 1) {
#endif
#ifdef WOLLONGONG
		if ( (rc = netread(fd, &c, 1)) == 1) {
#endif
#ifdef UCX
		if ( (rc = read(fd, &c, 1)) == 1) {
#endif
			*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; 				/* Tack a NULL on the end */
	return(n);
}


/*
 * ZapCRLF removes all carriage returns and linefeeds from a C-string.
 */

void
ZapCRLF(inputline)
  char *inputline;
{
     char *cp;

     cp = (char * ) strchr(inputline, '\r');    /* Zap CR-LF */
     if (cp != NULL)
	  *cp = '\0';
     else {
	  cp = (char * ) strchr(inputline, '\n');
	  if (cp != NULL)
	       *cp = '\0';
     }
}