31ece5769d
ntp 4.2.8p5 Reviewed by: cy, roberto Relnotes: yes Differential Revision: https://reviews.freebsd.org/D4828
123 lines
1.9 KiB
C
123 lines
1.9 KiB
C
/*
|
|
* atolfp - convert an ascii string to an l_fp number
|
|
*/
|
|
#include <config.h>
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
|
|
#include "ntp_fp.h"
|
|
#include "ntp_string.h"
|
|
#include "ntp_assert.h"
|
|
|
|
/*
|
|
* Powers of 10
|
|
*/
|
|
static u_long ten_to_the_n[10] = {
|
|
0,
|
|
10,
|
|
100,
|
|
1000,
|
|
10000,
|
|
100000,
|
|
1000000,
|
|
10000000,
|
|
100000000,
|
|
1000000000,
|
|
};
|
|
|
|
|
|
int
|
|
atolfp(
|
|
const char *str,
|
|
l_fp *lfp
|
|
)
|
|
{
|
|
register const char *cp;
|
|
register u_long dec_i;
|
|
register u_long dec_f;
|
|
char *ind;
|
|
int ndec;
|
|
int isneg;
|
|
static const char *digits = "0123456789";
|
|
|
|
REQUIRE(str != NULL);
|
|
|
|
isneg = 0;
|
|
dec_i = dec_f = 0;
|
|
ndec = 0;
|
|
cp = str;
|
|
|
|
/*
|
|
* We understand numbers of the form:
|
|
*
|
|
* [spaces][-|+][digits][.][digits][spaces|\n|\0]
|
|
*/
|
|
while (isspace((unsigned char)*cp))
|
|
cp++;
|
|
|
|
if (*cp == '-') {
|
|
cp++;
|
|
isneg = 1;
|
|
}
|
|
|
|
if (*cp == '+')
|
|
cp++;
|
|
|
|
if (*cp != '.' && !isdigit((unsigned char)*cp))
|
|
return 0;
|
|
|
|
while (*cp != '\0' && (ind = strchr(digits, *cp)) != NULL) {
|
|
dec_i = (dec_i << 3) + (dec_i << 1); /* multiply by 10 */
|
|
dec_i += (u_long)(ind - digits);
|
|
cp++;
|
|
}
|
|
|
|
if (*cp != '\0' && !isspace((unsigned char)*cp)) {
|
|
if (*cp++ != '.')
|
|
return 0;
|
|
|
|
while (ndec < 9 && *cp != '\0'
|
|
&& (ind = strchr(digits, *cp)) != NULL) {
|
|
ndec++;
|
|
dec_f = (dec_f << 3) + (dec_f << 1); /* *10 */
|
|
dec_f += (u_long)(ind - digits);
|
|
cp++;
|
|
}
|
|
|
|
while (isdigit((unsigned char)*cp))
|
|
cp++;
|
|
|
|
if (*cp != '\0' && !isspace((unsigned char)*cp))
|
|
return 0;
|
|
}
|
|
|
|
if (ndec > 0) {
|
|
register u_long tmp;
|
|
register u_long bit;
|
|
register u_long ten_fact;
|
|
|
|
ten_fact = ten_to_the_n[ndec];
|
|
|
|
tmp = 0;
|
|
bit = 0x80000000;
|
|
while (bit != 0) {
|
|
dec_f <<= 1;
|
|
if (dec_f >= ten_fact) {
|
|
tmp |= bit;
|
|
dec_f -= ten_fact;
|
|
}
|
|
bit >>= 1;
|
|
}
|
|
if ((dec_f << 1) > ten_fact)
|
|
tmp++;
|
|
dec_f = tmp;
|
|
}
|
|
|
|
if (isneg)
|
|
M_NEG(dec_i, dec_f);
|
|
|
|
lfp->l_ui = dec_i;
|
|
lfp->l_uf = dec_f;
|
|
return 1;
|
|
}
|