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Add support for negative width.

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This commit is contained in:
Victor Zverovich 2014-06-23 08:10:50 -07:00
parent 91e6bc8b97
commit 4099a1269b
2 changed files with 31 additions and 5 deletions
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35
format.cc
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@ -609,18 +609,43 @@ unsigned fmt::BasicWriter<Char>::PrintfParser::ParseHeader(
}
}
}
// Parse flags and width.
ParseFlags(spec, s);
// Parse width.
if (*s >= '0' && *s <= '9') {
spec.width_ = internal::ParseNonnegativeInt(s, error);
} else if (*s == '*') {
++s;
const ArgInfo &arg = HandleArgIndex(UINT_MAX, error);
if (arg.type <= LAST_INTEGER_TYPE)
spec.width_ = GetIntValue(arg);
else if (!error)
ULongLong width = 0;
switch (arg.type) {
case INT:
width = arg.int_value;
if (arg.int_value < 0) {
spec.align_ = ALIGN_LEFT;
width = -width;
}
break;
case UINT:
width = arg.uint_value;
break;
case LONG_LONG:
width = arg.long_long_value;
if (arg.long_long_value < 0) {
spec.align_ = ALIGN_LEFT;
width = -width;
}
break;
case ULONG_LONG:
width = arg.ulong_long_value;
break;
default:
if (!error)
error = "width is not integer";
// TODO: check for negative width
}
if (width <= INT_MAX)
spec.width_ = static_cast<unsigned>(width);
else if (!error)
error = "number is too big in format";
}
return arg_index;
}

1
test/printf-test.cc
View File

@ -221,6 +221,7 @@ TEST(PrintfTest, Width) {
TEST(PrintfTest, DynamicWidth) {
EXPECT_EQ(" 42", str(fmt::sprintf("%*d", 5, 42)));
EXPECT_EQ("42 ", str(fmt::sprintf("%*d", -5, 42)));
EXPECT_THROW_MSG(fmt::sprintf("%*d", 5.0, 42), FormatError,
"width is not integer");
EXPECT_THROW_MSG(fmt::sprintf("%*d"), FormatError,