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avoid isprint, because it is locale specific (#1189)

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* avoid isprint

`std::isprint` is locale-specific and the JSON-spec is not.
In particular, isprint('\t') is true in Windows CP1252.

Has bitten others, e.g. https://github.com/laurikari/tre/issues/64

Fixes #1187

* semicolon (rookie mistake!)
This commit is contained in:
Billy Donahue 2020-06-11 17:43:44 -04:00 committed by GitHub
parent 9be5895985
commit b3189a0800
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1 changed files with 3 additions and 3 deletions
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src/lib_json/json_writer.cpp
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@ -175,11 +175,11 @@ String valueToString(double value, unsigned int precision,
String valueToString(bool value) { return value ? "true" : "false"; } String valueToString(bool value) { return value ? "true" : "false"; }
static bool isAnyCharRequiredQuoting(char const* s, size_t n) { static bool doesAnyCharRequireEscaping(char const* s, size_t n) {
assert(s || !n); assert(s || !n);
return std::any_of(s, s + n, [](unsigned char c) { return std::any_of(s, s + n, [](unsigned char c) {
return c == '\\' || c == '"' || !std::isprint(c); return c == '\\' || c == '"' || c < 0x20 || c > 0x7F;
}); });
} }
@ -275,7 +275,7 @@ static String valueToQuotedStringN(const char* value, unsigned length,
if (value == nullptr) if (value == nullptr)
return ""; return "";
if (!isAnyCharRequiredQuoting(value, length)) if (!doesAnyCharRequireEscaping(value, length))
return String("\"") + value + "\""; return String("\"") + value + "\"";
// We have to walk value and escape any special characters. // We have to walk value and escape any special characters.
// Appending to String is not efficient, but this should be rare. // Appending to String is not efficient, but this should be rare.