External/fmt
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Allow %s as generic format specifier in printf

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Signed integers are formatted as %d
Unsigned integers are formatted as %u
Doubles are formatted as %f
Chars are formatted as %c
Void Pointers are formatted as %p
This commit is contained in:
Brendan McCarthy 2017-01-10 20:07:41 +10:00
parent e0251fdcef
commit b059a5e647
2 changed files with 38 additions and 0 deletions
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26
fmt/printf.h
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@ -92,9 +92,18 @@ class ArgConverter : public ArgVisitor<ArgConverter<T>, void> {
visit_any_int(value);
}
void visit_char(char value) {
if (type_ != 's' && type_ != 'S')
visit_any_int(value);
}
template <typename U>
void visit_any_int(U value) {
bool is_signed = type_ == 'd' || type_ == 'i';
if (type_ == 's' || type_ == 'S') {
is_signed = std::numeric_limits<U>::is_signed;
}
using internal::Arg;
typedef typename internal::Conditional<
is_same<T, void>::value, U, T>::type TargetType;
@ -463,6 +472,23 @@ void PrintfFormatter<Char, AF>::format(BasicCStringRef<Char> format_str) {
if (!*s)
FMT_THROW(FormatError("invalid format string"));
spec.type_ = static_cast<char>(*s++);
if (spec.type_ == 's' || spec.type_ == 'S') {
if (arg.type == Arg::POINTER) {
spec.type_ = 'p';
} else if (arg.type == Arg::CHAR) {
spec.type_ = 'c';
} else if (arg.type == Arg::BOOL) {
// leave bool alone
} else if (arg.type <= Arg::LAST_INTEGER_TYPE) {
// all other integer types
spec.type_ = 'd';
} else if (arg.type <= Arg::LAST_NUMERIC_TYPE) {
// all floating point types
spec.type_ = 'f';
}
}
if (arg.type <= Arg::LAST_INTEGER_TYPE) {
// Normalize type.
switch (spec.type_) {

12
test/printf-test.cc
View File

@ -202,6 +202,8 @@ TEST(PrintfTest, HashFlag) {
TEST(PrintfTest, Width) {
EXPECT_PRINTF(" abc", "%5s", "abc");
EXPECT_PRINTF(" -42", "%5s", "-42");
EXPECT_PRINTF(" 0.123456", "%10s", 0.123456);
// Width cannot be specified twice.
EXPECT_THROW_MSG(fmt::sprintf("%5-5d", 42), FormatError,
@ -381,11 +383,14 @@ TEST(PrintfTest, Bool) {
TEST(PrintfTest, Int) {
EXPECT_PRINTF("-42", "%d", -42);
EXPECT_PRINTF("-42", "%i", -42);
EXPECT_PRINTF("-42", "%s", -42);
unsigned u = 0 - 42u;
EXPECT_PRINTF(fmt::format("{}", u), "%u", -42);
EXPECT_PRINTF(fmt::format("{:o}", u), "%o", -42);
EXPECT_PRINTF(fmt::format("{:x}", u), "%x", -42);
EXPECT_PRINTF(fmt::format("{:X}", u), "%X", -42);
EXPECT_PRINTF(fmt::format("{}", u), "%s", u);
EXPECT_PRINTF(fmt::format("{}", u), "%S", u);
}
TEST(PrintfTest, LongLong) {
@ -398,6 +403,8 @@ TEST(PrintfTest, LongLong) {
TEST(PrintfTest, Float) {
EXPECT_PRINTF("392.650000", "%f", 392.65);
EXPECT_PRINTF("392.650000", "%F", 392.65);
EXPECT_PRINTF("392.650000", "%s", 392.65);
EXPECT_PRINTF("392.650000", "%S", 392.65);
char buffer[BUFFER_SIZE];
safe_sprintf(buffer, "%e", 392.65);
EXPECT_PRINTF(buffer, "%e", 392.65);
@ -422,6 +429,7 @@ TEST(PrintfTest, Inf) {
TEST(PrintfTest, Char) {
EXPECT_PRINTF("x", "%c", 'x');
EXPECT_PRINTF("x", "%s", 'x');
int max = std::numeric_limits<int>::max();
EXPECT_PRINTF(fmt::format("{}", static_cast<char>(max)), "%c", max);
//EXPECT_PRINTF("x", "%lc", L'x');
@ -440,13 +448,17 @@ TEST(PrintfTest, Pointer) {
int n;
void *p = &n;
EXPECT_PRINTF(fmt::format("{}", p), "%p", p);
EXPECT_PRINTF(fmt::format("{}", p), "%s", p);
p = 0;
EXPECT_PRINTF("(nil)", "%p", p);
EXPECT_PRINTF(" (nil)", "%10p", p);
EXPECT_PRINTF("(nil)", "%s", p);
EXPECT_PRINTF(" (nil)", "%10s", p);
const char *s = "test";
EXPECT_PRINTF(fmt::format("{:p}", s), "%p", s);
const char *null_str = 0;
EXPECT_PRINTF("(nil)", "%p", null_str);
EXPECT_PRINTF("(null)", "%s", null_str);
}
TEST(PrintfTest, Location) {