77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/*
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* Copyright (c) 1983 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
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY 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_network.c 5.5 (Berkeley) 6/27/88";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <netinet/in.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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u_long
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inet_network(cp)
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register char *cp;
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{
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register u_long val, base, n;
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register char c;
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u_long parts[4], *pp = parts;
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register int 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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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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if (pp >= parts + 4)
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return (INADDR_NONE);
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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 (INADDR_NONE);
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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 (INADDR_NONE);
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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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