61 lines
1.1 KiB
C
61 lines
1.1 KiB
C
#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)inet_network.c 1.1 94/10/31 SMI"; /* from UCB 4.2 82/10/07 */
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#endif
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#include <sys/types.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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if ((c - '0') >= base)
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break;
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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 (-1);
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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 (-1);
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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 (-1);
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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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