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libdtoa: fixed handling of NaN and Infinity

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otherwise we print thousands of 00000 characters
This commit is contained in:
Andrew Tridgell
2013-04-17 21:19:19 +10:00
parent a627f6c0eb
commit b06098a540
1 changed files with 22 additions and 1 deletions
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nuttx/libc/stdio/lib_libdtoa.c
+22 -1
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@@ -43,6 +43,7 @@
/****************************************************************************
* Included Files
****************************************************************************/
#include <math.h>
/****************************************************************************
* Pre-processor Definitions
@@ -104,6 +105,13 @@ static void zeroes(FAR struct lib_outstream_s *obj, int nzeroes)
* Private Functions
****************************************************************************/
static void lib_dtoa_string(FAR struct lib_outstream_s *obj, const char *str)
{
while (*str) {
obj->put(obj, *str++);
}
}
/****************************************************************************
* Name: lib_dtoa
*
@@ -138,8 +146,21 @@ static void lib_dtoa(FAR struct lib_outstream_s *obj, int fmt, int prec,
int dsgn; /* Unused sign indicator */
int i;
/* Non-zero... positive or negative */
/* 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)
{
value = -value;