1 /* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>
2 * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
4 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
8 * Manuel Novoa III Dec 2000
10 * Converted to use my new (un)signed long (long) to string routines, which
11 * are smaller than the previous functions and don't require static buffers.
12 * In the process, removed the reference to strcat and cut object size of
13 * inet_ntoa in half (from 190 bytes down to 94).
15 * Manuel Novoa III Feb 2002
17 * Changed to use _int10tostr.
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
27 #include <bits/uClibc_uintmaxtostr.h>
31 * More undocumented inet_aton features.
32 * (read: uclibc doesnt support but glibc does)
33 * http://www.mkssoftware.com/docs/man3/inet_aton.3.asp
35 * *cp can take the form of:
36 * a.b.c.d - {a,b,c,d} -> 1 byte
37 * a.b.c - {a,b} -> 1 byte {c} -> 2 bytes
38 * a.b - {a} -> 1 byte {b} -> 3 bytes
41 * Each part may be decimal, octal, or hexadecimal as in ISO C.
42 * 0x or 0X -> hexadecimal
46 int inet_aton(const char *cp, struct in_addr *addrptr)
57 for (part = 1; part <= 4; part++) {
63 while (isdigit(*cp)) {
75 if (c != '\0' && !isspace(c))
83 /* W. Richard Stevens in his book UNIX Network Programming,
84 * Volume 1, second edition, on page 71 says:
86 * An undocumented feature of inet_aton is that if addrptr is
87 * a null pointer, the function still performs it validation
88 * of the input string, but does not store the result.
91 addrptr->s_addr = htonl(addr);
96 libc_hidden_def(inet_aton)
101 in_addr_t inet_addr(const char *cp)
105 if (!inet_aton(cp, &a))
110 libc_hidden_def(inet_addr)
115 #define INET_NTOA_MAX_LEN 16 /* max 12 digits + 3 '.'s + 1 nul */
117 char *inet_ntoa_r(struct in_addr in, char buf[INET_NTOA_MAX_LEN])
119 in_addr_t addr = ntohl(in.s_addr);
124 p = buf + INET_NTOA_MAX_LEN - 1; /* cannot use sizeof(buf) here */
125 for (i = 0; i < 4; i++ ) {
126 p = _int10tostr(p, addr & 0xff) - 1;
136 libc_hidden_def(inet_ntoa_r)
138 char *inet_ntoa(struct in_addr in)
140 static char buf[INET_NTOA_MAX_LEN];
141 return inet_ntoa_r(in, buf);
143 libc_hidden_def(inet_ntoa)
146 #ifdef L_inet_makeaddr
148 /* for some reason it does not remove the jump relocation */
151 * Formulate an Internet address from network + host. Used in
152 * building addresses stored in the ifnet structure.
154 struct in_addr inet_makeaddr(in_addr_t net, in_addr_t host)
159 addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
160 else if (net < 65536)
161 addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
162 else if (net < 16777216UL)
163 addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
167 return *(struct in_addr *)&addr;
169 libc_hidden_def(inet_makeaddr)
174 * Return the local network address portion of an
175 * internet address; handles class a/b/c network
178 in_addr_t inet_lnaof(struct in_addr in)
180 in_addr_t i = ntohl(in.s_addr);
183 return (i & IN_CLASSA_HOST);
184 else if (IN_CLASSB(i))
185 return (i & IN_CLASSB_HOST);
187 return (i & IN_CLASSC_HOST);
194 * Return the network number from an internet
195 * address; handles class a/b/c network #'s.
198 inet_netof(struct in_addr in)
200 in_addr_t i = ntohl(in.s_addr);
203 return ((i & IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
204 else if (IN_CLASSB(i))
205 return ((i & IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
207 return ((i & IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
209 libc_hidden_def(inet_netof)