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Create format string with sprintf.

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For now use hardcoded precision '17' for now
This commit is contained in:
Benjamin Knecht 2015-10-15 17:28:56 +02:00 committed by Christopher Dunn
parent 26159b96f1
commit 2f9a6a682c
1 changed files with 7 additions and 4 deletions
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11
src/lib_json/json_writer.cpp
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@ -114,17 +114,20 @@ std::string valueToString(UInt value) {
#endif // # if defined(JSON_HAS_INT64) #endif // # if defined(JSON_HAS_INT64)
std::string valueToString(double value, bool useSpecialFloats) { std::string valueToString(double value, bool useSpecialFloats, int precision) {
// Allocate a buffer that is more than large enough to store the 16 digits of // Allocate a buffer that is more than large enough to store the 16 digits of
// precision requested below. // precision requested below.
char buffer[32]; char buffer[32];
int len = -1; int len = -1;
char formatString[6];
sprintf(formatString, "%%.%dg", precision);
// Print into the buffer. We need not request the alternative representation // Print into the buffer. We need not request the alternative representation
// that always has a decimal point because JSON doesn't distingish the // that always has a decimal point because JSON doesn't distingish the
// concepts of reals and integers. // concepts of reals and integers.
if (isfinite(value)) { if (isfinite(value)) {
len = snprintf(buffer, sizeof(buffer), "%.17g", value); len = snprintf(buffer, sizeof(buffer), formatString, value);
} else { } else {
// IEEE standard states that NaN values will not compare to themselves // IEEE standard states that NaN values will not compare to themselves
if (value != value) { if (value != value) {
@ -141,7 +144,7 @@ std::string valueToString(double value, bool useSpecialFloats) {
return buffer; return buffer;
} }
std::string valueToString(double value) { return valueToString(value, false); } std::string valueToString(double value) { return valueToString(value, false, 17); }
std::string valueToString(bool value) { return value ? "true" : "false"; } std::string valueToString(bool value) { return value ? "true" : "false"; }
@ -882,7 +885,7 @@ void BuiltStyledStreamWriter::writeValue(Value const& value) {
pushValue(valueToString(value.asLargestUInt())); pushValue(valueToString(value.asLargestUInt()));
break; break;
case realValue: case realValue:
pushValue(valueToString(value.asDouble(), useSpecialFloats_)); pushValue(valueToString(value.asDouble(), useSpecialFloats_, 17));
break; break;
case stringValue: case stringValue:
{ {