70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
|
/* $NetBSD: hextolfp.c,v 1.1.1.1 2000/03/29 12:38:50 simonb Exp $ */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* hextolfp - convert an ascii hex string to an l_fp number
|
||
|
|
*/
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <ctype.h>
|
||
|
|
|
||
|
|
#include "ntp_fp.h"
|
||
|
|
#include "ntp_string.h"
|
||
|
|
#include "ntp_stdlib.h"
|
||
|
|
|
||
|
|
int
|
||
|
|
hextolfp(
|
||
|
|
const char *str,
|
||
|
|
l_fp *lfp
|
||
|
|
)
|
||
|
|
{
|
||
|
|
register const char *cp;
|
||
|
|
register const char *cpstart;
|
||
|
|
register u_long dec_i;
|
||
|
|
register u_long dec_f;
|
||
|
|
char *ind = NULL;
|
||
|
|
static const char *digits = "0123456789abcdefABCDEF";
|
||
|
|
|
||
|
|
dec_i = dec_f = 0;
|
||
|
|
cp = str;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We understand numbers of the form:
|
||
|
|
*
|
||
|
|
* [spaces]8_hex_digits[.]8_hex_digits[spaces|\n|\0]
|
||
|
|
*/
|
||
|
|
while (isspace((int)*cp))
|
||
|
|
cp++;
|
||
|
|
|
||
|
|
cpstart = cp;
|
||
|
|
while (*cp != '\0' && (cp - cpstart) < 8 &&
|
||
|
|
(ind = strchr(digits, *cp)) != NULL) {
|
||
|
|
dec_i = dec_i << 4; /* multiply by 16 */
|
||
|
|
dec_i += ((ind - digits) > 15) ? (ind - digits) - 6
|
||
|
|
: (ind - digits);
|
||
|
|
cp++;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((cp - cpstart) < 8 || ind == NULL)
|
||
|
|
return 0;
|
||
|
|
if (*cp == '.')
|
||
|
|
cp++;
|
||
|
|
|
||
|
|
cpstart = cp;
|
||
|
|
while (*cp != '\0' && (cp - cpstart) < 8 &&
|
||
|
|
(ind = strchr(digits, *cp)) != NULL) {
|
||
|
|
dec_f = dec_f << 4; /* multiply by 16 */
|
||
|
|
dec_f += ((ind - digits) > 15) ? (ind - digits) - 6
|
||
|
|
: (ind - digits);
|
||
|
|
cp++;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((cp - cpstart) < 8 || ind == NULL)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (*cp != '\0' && !isspace((int)*cp))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
lfp->l_ui = dec_i;
|
||
|
|
lfp->l_uf = dec_f;
|
||
|
|
return 1;
|
||
|
|
}
|