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FFstrbuf: handles double rounding and zero representation in formatter

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Carter Li
2025-08-20 10:10:30 +08:00
parent 26253f8863
commit 1f1d7cf936
2 changed files with 24 additions and 4 deletions
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src/util/FFstrbuf.c
+5 -1
View File
@@ -2,6 +2,7 @@
#include <ctype.h>
#include <inttypes.h>
#include <math.h>
char* CHAR_NULL_PTR = "";
@@ -577,9 +578,12 @@ void ffStrbufAppendDouble(FFstrbuf* strbuf, double value, int8_t precision)
ffStrbufEnsureFree(strbuf, 40); // Required by yyjson_write_number
char* start = strbuf->chars + strbuf->length;
if (precision == 0)
value = round(value);
yyjson_val val = {};
unsafe_yyjson_set_double(&val, value);
if (precision >= 0) unsafe_yyjson_set_fp_to_fixed(&val, precision == 0 ? 1 : precision); // yyjson ignores precision == 0
if (precision > 0)
unsafe_yyjson_set_fp_to_fixed(&val, precision);
// Write at most <precision> digits after the decimal point; doesn't append trailing zeros
char* end = yyjson_write_number(&val, start);
tests/strbuf.c
+19 -3
View File
@@ -759,6 +759,14 @@ int main(void)
ffStrbufAppendDouble(&strbuf, 120.123456789, 5);
VERIFY(ffStrbufEqualS(&strbuf, "120.12346"));
ffStrbufClear(&strbuf);
ffStrbufAppendDouble(&strbuf, 120.888888, 0);
VERIFY(ffStrbufEqualS(&strbuf, "121"));
ffStrbufClear(&strbuf);
ffStrbufAppendDouble(&strbuf, 120.999999, 2);
VERIFY(ffStrbufEqualS(&strbuf, "121.00"));
ffStrbufClear(&strbuf);
ffStrbufAppendDouble(&strbuf, 120.123456789, 0);
VERIFY(ffStrbufEqualS(&strbuf, "120"));
@@ -799,6 +807,14 @@ int main(void)
ffStrbufAppendDouble(&strbuf, -120.123, 5);
VERIFY(ffStrbufEqualS(&strbuf, "-120.12300"));
ffStrbufClear(&strbuf);
ffStrbufAppendDouble(&strbuf, -120.888888, 0);
VERIFY(ffStrbufEqualS(&strbuf, "-121"));
ffStrbufClear(&strbuf);
ffStrbufAppendDouble(&strbuf, -120.999999, 2);
VERIFY(ffStrbufEqualS(&strbuf, "-121.00"));
ffStrbufClear(&strbuf);
ffStrbufAppendDouble(&strbuf, 1.2345e50, 1);
VERIFY(ffStrbufEqualS(&strbuf, "1.2345e50"));
@@ -832,12 +848,12 @@ int main(void)
VERIFY(ffStrbufEqualS(&strbuf, "-123450000000000000000.0"));
ffStrbufClear(&strbuf);
ffStrbufAppendDouble(&strbuf, 0, 0);
ffStrbufAppendDouble(&strbuf, +0.0, 0);
VERIFY(ffStrbufEqualS(&strbuf, "0"));
ffStrbufClear(&strbuf);
ffStrbufAppendDouble(&strbuf, -0, 0);
VERIFY(ffStrbufEqualS(&strbuf, "0"));
ffStrbufAppendDouble(&strbuf, -0.0, 0);
VERIFY(ffStrbufEqualS(&strbuf, "-0"));
ffStrbufDestroy(&strbuf);
}