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replace modf so we don't need the math library

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This commit is contained in:
Andrew Tridgell -
parent b6645402b1
commit 79c0d24a30
1 changed files with 39 additions and 4 deletions
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43
source/lib/snprintf.c
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@ -71,7 +71,6 @@
#endif
#include <sys/types.h>
#include <stdarg.h>
#include <math.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
@ -551,6 +550,42 @@ static LLONG ROUND(LDOUBLE value)
return intpart;
}
/* a replacement for modf that doesn't need the math library. Should
be portable, but slow */
static double my_modf(double x0, double *iptr)
{
int i;
long l;
double x = x0;
double f = 1.0;
for (i=0;i<100;i++) {
l = (long)x;
if (l <= (x+1) && l >= (x-1)) break;
x *= 0.1;
f *= 10.0;
}
if (i == 100) {
/* yikes! the number is beyond what we can handle. What do we do? */
(*iptr) = 0;
return 0;
}
if (i != 0) {
double i2;
double ret;
ret = my_modf(x0-l*f, &i2);
(*iptr) = l*f + i2;
return ret;
}
(*iptr) = l;
return x - (*iptr);
}
static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
LDOUBLE fvalue, int min, int max, int flags)
{
@ -608,7 +643,7 @@ static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
*/
temp = ufvalue;
modf(temp, &intpart);
my_modf(temp, &intpart);
fracpart = ROUND((POW10(max)) * (ufvalue - intpart));
@ -621,7 +656,7 @@ static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
/* Convert integer part */
do {
temp = intpart;
modf (intpart*0.1, &intpart);
my_modf(intpart*0.1, &intpart);
temp = temp*0.1;
index = (int) ((temp -intpart +0.05)* 10.0);
/* index = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
@ -637,7 +672,7 @@ static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
{
do {
temp = fracpart;
modf (fracpart*0.1, &fracpart);
my_modf(fracpart*0.1, &fracpart);
temp = temp*0.1;
index = (int) ((temp -fracpart +0.05)* 10.0);
/* index = (int) ((((temp/10) -fracpart) +0.05) *10); */