150 lines
3.5 KiB
C
Executable file
150 lines
3.5 KiB
C
Executable file
/*
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* Copyright (c) 1983, 1990 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted provided
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* that: (1) source distributions retain this entire copyright notice and
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* comment, and (2) distributions including binaries display the following
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* acknowledgement: ``This product includes software developed by the
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* University of California, Berkeley and its contributors'' in the
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* documentation or other materials provided with the distribution and in
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* all advertising materials mentioning features or use of this software.
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* Neither the name of the University nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)inet_addr.c 5.8 (Berkeley) 6/23/90";
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#endif /* LIBC_SCCS and not lint */
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#if _MINIX
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#include <sys/types.h>
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#include <ctype.h>
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#include <errno.h>
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#include <net/hton.h>
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#include <net/gen/in.h>
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#include <net/gen/inet.h>
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#endif
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#ifdef __STDC__
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#define _CONST const
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#else
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#define _CONST
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#endif
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/*
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* Ascii internet address interpretation routine.
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* The value returned is in network order.
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*/
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ipaddr_t
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inet_addr(cp)
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register _CONST char *cp;
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{
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ipaddr_t val;
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if (inet_aton(cp, &val))
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return (val);
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errno= EINVAL;
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return (ipaddr_t)-1;
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}
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/*
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* Check whether "cp" is a valid ascii representation
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* of an Internet address and convert to a binary address.
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* Returns 1 if the address is valid, 0 if not.
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* This replaces inet_addr, the return value from which
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* cannot distinguish between failure and a local broadcast address.
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*/
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int
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inet_aton(cp, addr)
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register _CONST char *cp;
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ipaddr_t *addr;
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{
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register u32_t val, base, n;
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register char c;
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u32_t parts[4], *pp = parts;
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for (;;) {
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/*
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* Collect number up to ``.''.
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* Values are specified as for C:
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* 0x=hex, 0=octal, other=decimal.
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*/
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val = 0; base = 10;
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if (*cp == '0') {
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if (*++cp == 'x' || *cp == 'X')
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base = 16, cp++;
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else
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base = 8;
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}
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while ((c = *cp) != '\0') {
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if (isascii(c) && isdigit(c)) {
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val = (val * base) + (c - '0');
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cp++;
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continue;
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}
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if (base == 16 && isascii(c) && isxdigit(c)) {
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val = (val << 4) +
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(c + 10 - (islower(c) ? 'a' : 'A'));
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cp++;
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continue;
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}
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break;
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}
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if (*cp == '.') {
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/*
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* Internet format:
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* a.b.c.d
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* a.b.c (with c treated as 16-bits)
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* a.b (with b treated as 24 bits)
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*/
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if (pp >= parts + 3 || val > 0xff)
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return (0);
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*pp++ = val, cp++;
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} else
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break;
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}
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/*
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* Check for trailing characters.
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*/
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if (*cp && (!isascii(*cp) || !isspace(*cp)))
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return (0);
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/*
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* Concoct the address according to
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* the number of parts specified.
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*/
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n = pp - parts + 1;
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switch (n) {
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case 1: /* a -- 32 bits */
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break;
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case 2: /* a.b -- 8.24 bits */
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if (val > 0xffffff)
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return (0);
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val |= parts[0] << 24;
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break;
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case 3: /* a.b.c -- 8.8.16 bits */
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if (val > 0xffff)
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return (0);
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val |= (parts[0] << 24) | (parts[1] << 16);
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break;
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case 4: /* a.b.c.d -- 8.8.8.8 bits */
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if (val > 0xff)
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return (0);
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val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
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break;
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}
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if (addr)
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*addr = htonl(val);
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return (1);
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}
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