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/* hextoint.c,v 3.1 1993/07/06 01:08:21 jbj Exp
* hextoint - convert an ascii string in hex to an unsigned
* long, with error checking
*/
#include <ctype.h>
#include "ntp_stdlib.h"
int
hextoint(str, ival)
const char *str;
U_LONG *ival;
{
register U_LONG u;
register const char *cp;
cp = str;
if (*cp == '\0')
return 0;
u = 0;
while (*cp != '\0') {
if (!isxdigit(*cp))
return 0;
if (u >= 0x10000000)
return 0; /* overflow */
u <<= 4;
if (*cp <= '9') /* very ascii dependent */
u += *cp++ - '0';
else if (*cp >= 'a')
u += *cp++ - 'a' + 10;
else
u += *cp++ - 'A' + 10;
}
*ival = u;
return 1;
}
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