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json_object_double_to_json_string() uses the %f conversion specifier to convert a double to a string:
size = snprintf(buf, 128, "%f", jso->o.c_double);
p = strchr(buf, ',');
if (p) {
*p = '.';
} else {
p = strchr(buf, '.');
}
This is lossy, it does not preserve all significant digits. Exact conversion between binary and decimal floating point is difficult, and json-c should probably use gdtoa or grisu to implement this. That would ensure nice-looking but accurate output, but it's a lot of code. There is a width (18?) that ensures that %s is completely accurate, but I don't have the details at hand right now.
The decimal comma rewriting is also a bit suspect, but I couldn't get it to fail in a fa_IR locale (which is supposed to have neither a decimal point nor a decimal comma).
Decoding is not thread-safe because it switches the process LC_NUMERIC locale to C temporarily. I strongly suspect this is done for the benefit of double parsing with sscanf, so it is related to this issue.
json_object_double_to_json_string() uses the %f conversion specifier to convert a double to a string: size = snprintf(buf, 128, "%f", jso->o.c_double); p = strchr(buf, ','); if (p) { *p = '.'; } else { p = strchr(buf, '.'); } This is lossy, it does not preserve all significant digits. Exact conversion between binary and decimal floating point is difficult, and json-c should probably use gdtoa or grisu to implement this. That would ensure nice-looking but accurate output, but it's a lot of code. There is a width (18?) that ensures that %s is completely accurate, but I don't have the details at hand right now. The decimal comma rewriting is also a bit suspect, but I couldn't get it to fail in a fa_IR locale (which is supposed to have neither a decimal point nor a decimal comma).