1/*
2 *   Copyright (c) International Business Machines  Corp., 2001
3 *
4 *   This program is free software;  you can redistribute it and/or modify
5 *   it under the terms of the GNU General Public License as published by
6 *   the Free Software Foundation; either version 2 of the License, or
7 *   (at your option) any later version.
8 *
9 *   This program is distributed in the hope that it will be useful,
10 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
11 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
12 *   the GNU General Public License for more details.
13 *
14 *   You should have received a copy of the GNU General Public License
15 *   along with this program;  if not, write to the Free Software
16 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19/*****************************************************************************
20 *  readline.c
21 ******************************************************************************/
22
23#include <unistd.h>
24
25/* Read line from a descriptor, byte at a time, return number of
26   characters up to the null */
27
28int readline(int fd, char *ptr, int maxlen)
29{
30	int n, rc;
31	char c;
32	/*
33	   printf("readline: fd = %d\n", fd);
34	 */
35	for (n = 1; n < maxlen; n++) {
36		if ((rc = read(fd, &c, 1)) == 1) {
37			*ptr++ = c;
38			if (c == '\n')
39				break;
40		} else if (rc == 0) {
41			if (n == 1)
42				return 0;	/* EOF no data read */
43			else
44				break;	/* EOF, some data read */
45		} else
46			return (-1);	/* error */
47	}
48	*ptr = 0;
49	return (n);
50}
51