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SGI Freeware 1998 November
/
Freeware November 1998.img
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dist
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fw_UDELxntp.idb
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usr
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freeware
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src
/
xntp-3.4o-export
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lib
/
hextoint.c.z
/
hextoint.c
Wrap
C/C++ Source or Header
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1998-01-21
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601b
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39 lines
/*
* 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;
}