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src: fix use of uninitialized variable#9280

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src: fix use of uninitialized variable #9280

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src: fix use of uninitialized variable
bnoordhuis Oct 25, 2016
b33ec7c
src: guard reinterpret_cast with static_assert
bnoordhuis Oct 25, 2016
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13 changes: 11 additions & 2 deletions src/node_i18n.cc
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Expand Up@@ -519,14 +519,22 @@ static void GetStringWidth(const FunctionCallbackInfo<Value>& args) {
}

TwoByteValue value(env->isolate(), args[0]);
if (value.length() <= 1) {

@jasnelljasnellOct 25, 2016

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This additional shortcut is wrong. See the CI failures (https://ci.nodejs.org/job/node-test-commit-osx/5807/nodes=osx1010/console).

@bnoordhuisbnoordhuisOct 25, 2016

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I'm about to go to bed so if you want to take this over, go ahead.

@jasnelljasnellOct 25, 2016

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+1 ... I just went ahead and created a new PR. I'll close this one in favor of that and we can follow up there. Thank you @bnoordhuis !

uint32_t width = static_cast<uint32_t>(value.length());
return args.GetReturnValue().Set(width);
}

// reinterpret_cast is required by windows to compile
UChar* str = reinterpret_cast<UChar*>(*value);
static_assert(sizeof(*str) == sizeof(**value),
"(sizeof(*str) == sizeof(**value)");
UChar32 c;
UChar32 p;
size_t n = 0;
uint32_t width = 0;

while (n < value.length()) {
U16_NEXT(str, n, value.length(), c);
do {
p = c;
U16_NEXT(str, n, value.length(), c);
// Don't count individual emoji codepoints that occur within an
Expand All@@ -546,7 +554,8 @@ static void GetStringWidth(const FunctionCallbackInfo<Value>& args) {
continue;
}
width += GetColumnWidth(c, ambiguous_as_full_width);
}
} while (n < value.length());

args.GetReturnValue().Set(width);
}

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