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105 lines
2.4 KiB
105 lines
2.4 KiB
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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i_netwrk.c
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Abstract:
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This module implements a routine to extract the network portion from
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an Internet address.
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Author:
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Mike Massa (mikemas) Sept 20, 1991
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Revision History:
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Who When What
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-------- -------- ----------------------------------------------
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mikemas 9-20-91 created
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Notes:
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Exports:
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inet_network()
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--*/
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#ident "@(#)inet_network.c 5.3 3/8/91"
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/*
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* Copyright (c) 1987, Spider Systems Limited
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*/
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/* inet_network.c 1.0 */
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/*
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* /usr/projects/tcp/SCCS.rel3/rel/src/lib/net/0/s.inet_network.c
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* @(#)inet_network.c 5.3
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*
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* Last delta created 14:10:57 3/4/91
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* This file extracted 11:20:23 3/8/91
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*
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*/
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/***************************************************************************/
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#include "local.h"
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#include <ctype.h>
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/*
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* Internet network address interpretation routine.
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* The library routines call this routine to interpret
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* network numbers.
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*/
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unsigned long
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inet_network(
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IN char *cp
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)
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{
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register unsigned long val, base, n;
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register char c;
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unsigned long parts[4], *pp = parts;
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register unsigned long i;
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again:
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val = 0; base = 10;
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if (*cp == '0') {
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base = 8, cp++;
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if (*cp == 'x' || *cp == 'X')
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base = 16, cp++;
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}
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while (c = *cp) {
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if (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 && isxdigit(c)) {
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val = (val << 4) + (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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/* GSS - next line was corrected on 8/5/89, was 'parts + 4' */
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if (pp >= parts + 3)
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return ((unsigned long)~0);
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*pp++ = val, cp++;
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goto again;
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}
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if (*cp && !isspace(*cp))
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return ((unsigned long)~0);
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*pp++ = val;
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n = pp - parts;
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if (n > 4)
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return ((unsigned long)~0);
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for (val = 0, i = 0; i < n; i++) {
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val <<= 8;
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val |= parts[i] & 0xff;
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}
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return (val);
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}
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