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
readline(int fd,char * ptr,int maxlen)28 int 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