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Support for printing NaN and infinity from Andrew Tridgell

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This commit is contained in:
Gregory Nutt 2013-04-17 07:40:48 -06:00
parent 504b25ee2b
commit 06871729dd
1 changed files with 40 additions and 3 deletions
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43
libc/stdio/lib_libdtoa.c
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@ -44,6 +44,8 @@
* Included Files
****************************************************************************/
#include <math.h>
#include "lib_internal.h"
/****************************************************************************
@ -84,6 +86,10 @@
* Private Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: zeroes
*
@ -103,9 +109,21 @@ static void zeroes(FAR struct lib_outstream_s *obj, int nzeroes)
}
/****************************************************************************
* Private Functions
* Name: lib_dtoa_string
*
* Description:
* Print the specified string
*
****************************************************************************/
static void lib_dtoa_string(FAR struct lib_outstream_s *obj, const char *str)
{
while (*str)
{
obj->put(obj, *str++);
}
}
/****************************************************************************
* Name: lib_dtoa
*
@ -140,6 +158,25 @@ static void lib_dtoa(FAR struct lib_outstream_s *obj, int fmt, int prec,
int dsgn; /* Unused sign indicator */
int i;
/* Special handling for NaN and Infinity */
if (isnan(value))
{
lib_dtoa_string(obj, "NaN");
return;
}
if (isinf(value))
{
if (value < 0.0d)
{
obj->put(obj, '-');
}
lib_dtoa_string(obj, "Infinity");
return;
}
/* Non-zero... positive or negative */
if (value < 0)
@ -173,7 +210,7 @@ static void lib_dtoa(FAR struct lib_outstream_s *obj, int fmt, int prec,
obj->put(obj, '0');
/* A decimal point is printed only in the alternate form or if a
/* A decimal point is printed only in the alternate form or if a
* particular precision is requested.
*/
@ -227,7 +264,7 @@ static void lib_dtoa(FAR struct lib_outstream_s *obj, int fmt, int prec,
for (i = expt; i > 0; i--)
{
if (*digits != '\0')
{
{
obj->put(obj, *digits);
digits++;
}