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/* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>
* This file is part of the Linux-8086 C library and is distributed
* under the GNU Library General Public License.
*/
/*
* Manuel Novoa III Dec 2000
*
* Converted to use my new (un)signed long (long) to string routines, which
* are smaller than the previous functions and don't require static buffers.
* In the process, removed the reference to strcat and cut object size of
* inet_ntoa in half (from 190 bytes down to 94).
*
* Manuel Novoa III Feb 2002
*
* Changed to use _int10tostr.
*/
#define __FORCE_GLIBC
#include <features.h>
#define _STDIO_UTILITY /* For _int10tostr. */
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <netinet/in.h>
int inet_aton(const char *cp, struct in_addr *inp);
#ifdef L_inet_aton
int inet_aton(cp, inp)
const char *cp;
struct in_addr *inp;
{
unsigned long addr;
int value;
int part;
if (!inp)
return 0;
addr = 0;
for (part = 1; part <= 4; part++) {
if (!isdigit(*cp))
return 0;
value = 0;
while (isdigit(*cp)) {
value *= 10;
value += *cp++ - '0';
if (value > 255)
return 0;
}
if (part < 4) {
if (*cp++ != '.')
return 0;
} else {
char c = *cp++;
if (c != '\0' && !isspace(c))
return 0;
}
addr <<= 8;
addr |= value;
}
inp->s_addr = htonl(addr);
return 1;
}
#endif
#ifdef L_inet_addr
unsigned long inet_addr(const char *cp)
{
struct in_addr a;
if (!inet_aton(cp, &a))
return -1;
else
return a.s_addr;
}
#endif
#ifdef L_inet_ntoa
char *inet_ntoa_r(struct in_addr in, char buf[16])
{
unsigned long addr = ntohl(in.s_addr);
int i;
char *p, *q;
q = 0;
p = buf + sizeof(buf) - 1;
for (i=0 ; i < 4 ; i++ ) {
p = _int10tostr(p, addr & 0xff) - 1;
addr >>= 8;
if (q) {
*q = '.';
}
q = p;
}
return p+1;
}
char *inet_ntoa(struct in_addr in)
{
static char buf[16]; /* max 12 digits + 3 '.'s + 1 nul */
return(inet_ntoa_r(in, buf));
}
#endif
#ifdef L_inet_makeaddr
/*
* Formulate an Internet address from network + host. Used in
* building addresses stored in the ifnet structure.
*/
struct in_addr inet_makeaddr(unsigned long net, unsigned long host)
{
unsigned long addr;
if (net < 128)
addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
else if (net < 65536)
addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
else if (net < 16777216L)
addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
else
addr = net | host;
addr = htonl(addr);
return (*(struct in_addr *)&addr);
}
#endif
#ifdef L_inet_lnaof
/*
* Return the local network address portion of an
* internet address; handles class a/b/c network
* number formats.
*/
unsigned long inet_lnaof(struct in_addr in)
{
unsigned long i = ntohl(in.s_addr);
if (IN_CLASSA(i))
return ((i)&IN_CLASSA_HOST);
else if (IN_CLASSB(i))
return ((i)&IN_CLASSB_HOST);
else
return ((i)&IN_CLASSC_HOST);
}
#endif
#ifdef L_inet_netof
/*
* Return the network number from an internet
* address; handles class a/b/c network #'s.
*/
u_int32_t
inet_netof(struct in_addr in)
{
u_int32_t i = ntohl(in.s_addr);
if (IN_CLASSA(i))
return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
else if (IN_CLASSB(i))
return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
else
return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
}
#endif
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