62 lines
960 B
C
62 lines
960 B
C
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/* $NetBSD: decodenetnum.c,v 1.1.1.1 2000/03/29 12:38:49 simonb Exp $ */
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/*
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* decodenetnum - return a net number (this is crude, but careful)
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*/
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#include <sys/types.h>
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#include <ctype.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include "ntp_stdlib.h"
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int
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decodenetnum(
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const char *num,
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u_int32 *netnum
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)
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{
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register const char *cp;
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register char *bp;
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register int i;
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register int temp;
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register int eos;
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char buf[80]; /* will core dump on really stupid stuff */
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cp = num;
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*netnum = 0;
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if (*cp == '[') {
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eos = ']';
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cp++;
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} else {
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eos = '\0';
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}
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for (i = 0; i < 4; i++) {
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bp = buf;
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while (isdigit((int)*cp))
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*bp++ = *cp++;
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if (bp == buf)
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break;
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if (i < 3) {
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if (*cp++ != '.')
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break;
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} else if (*cp != eos)
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break;
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*bp = '\0';
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temp = atoi(buf);
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if (temp > 255)
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break;
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*netnum <<= 8;
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*netnum += temp;
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}
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if (i < 4)
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return 0;
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*netnum = htonl(*netnum);
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return 1;
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}
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