1 /*
2 * Network library.
3 * Copyright (C) 1997 Kunihiro Ishiguro
4 *
5 * This file is part of GNU Zebra.
6 *
7 * GNU Zebra is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2, or (at your option) any
10 * later version.
11 *
12 * GNU Zebra is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Zebra; see the file COPYING. If not, write to the Free
19 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20 * 02111-1307, USA.
21 */
22
23 #include <zebra.h>
24 #include "log.h"
25 #include "network.h"
26
27 /* Read nbytes from fd and store into ptr. */
28 int
readn(int fd,u_char * ptr,int nbytes)29 readn (int fd, u_char *ptr, int nbytes)
30 {
31 int nleft;
32 int nread;
33
34 nleft = nbytes;
35
36 while (nleft > 0)
37 {
38 nread = read (fd, ptr, nleft);
39
40 if (nread < 0)
41 return (nread);
42 else
43 if (nread == 0)
44 break;
45
46 nleft -= nread;
47 ptr += nread;
48 }
49
50 return nbytes - nleft;
51 }
52
53 /* Write nbytes from ptr to fd. */
54 int
writen(int fd,const u_char * ptr,int nbytes)55 writen(int fd, const u_char *ptr, int nbytes)
56 {
57 int nleft;
58 int nwritten;
59
60 nleft = nbytes;
61
62 while (nleft > 0)
63 {
64 nwritten = write(fd, ptr, nleft);
65
66 if (nwritten <= 0)
67 return (nwritten);
68
69 nleft -= nwritten;
70 ptr += nwritten;
71 }
72 return nbytes - nleft;
73 }
74
75 int
set_nonblocking(int fd)76 set_nonblocking(int fd)
77 {
78 int flags;
79
80 /* According to the Single UNIX Spec, the return value for F_GETFL should
81 never be negative. */
82 if ((flags = fcntl(fd, F_GETFL)) < 0)
83 {
84 zlog_warn("fcntl(F_GETFL) failed for fd %d: %s",
85 fd, safe_strerror(errno));
86 return -1;
87 }
88 if (fcntl(fd, F_SETFL, (flags | O_NONBLOCK)) < 0)
89 {
90 zlog_warn("fcntl failed setting fd %d non-blocking: %s",
91 fd, safe_strerror(errno));
92 return -1;
93 }
94 return 0;
95 }
96
97 float
htonf(float host)98 htonf (float host)
99 {
100 #if !defined(__STDC_IEC_559__) && __GCC_IEC_559 < 0
101 #warning "Unknown floating-point format on platform, htonf may break"
102 #endif
103 u_int32_t lu1, lu2;
104 float convert;
105
106 memcpy (&lu1, &host, sizeof (u_int32_t));
107 lu2 = htonl (lu1);
108 memcpy (&convert, &lu2, sizeof (u_int32_t));
109 return convert;
110 }
111
112 float
ntohf(float net)113 ntohf (float net)
114 {
115 return htonf (net);
116 }
117