mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-11-20 02:01:19 +01:00
39 lines
646 B
C
39 lines
646 B
C
/* 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;
|
|
}
|