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45 lines
741 B
C
45 lines
741 B
C
/* $NetBSD: hextoint.c,v 1.6 2015/07/10 14:20:32 christos Exp $ */
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/*
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* hextoint - convert an ascii string in hex to an unsigned
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* long, with error checking
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*/
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#include <config.h>
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#include <ctype.h>
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#include "ntp_stdlib.h"
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int
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hextoint(
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const char *str,
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u_long *pu
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)
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{
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register u_long u;
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register const char *cp;
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cp = str;
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if (*cp == '\0')
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return 0;
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u = 0;
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while (*cp != '\0') {
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if (!isxdigit((unsigned char)*cp))
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return 0;
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if (u & 0xF0000000)
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return 0; /* overflow */
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u <<= 4;
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if ('0' <= *cp && *cp <= '9')
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u += *cp++ - '0';
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else if ('a' <= *cp && *cp <= 'f')
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u += *cp++ - 'a' + 10;
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else if ('A' <= *cp && *cp <= 'F')
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u += *cp++ - 'A' + 10;
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else
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return 0;
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}
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*pu = u;
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return 1;
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}
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