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LibC: Consume all whitespace in scanf if present in format

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We were consuming all whitespace from the format, but not the input
lexer - that was left to the actual format parsing code. It so happened
that we did not account for whitespace with the conversion specifier
'[', causing whitespace to end up in the output variables.

Fix this by always consuming all whitespace and removing the whitespace
logic from the conversion code.
This commit is contained in:
Jelle Raaijmakers 2022-09-06 10:35:40 +02:00 committed by Sam Atkins
parent 875ca2fb68
commit 325263f0e8
Notes: sideshowbarker 2024-07-17 07:19:27 +09:00 
Author: https://github.com/gmta
Commit: https://github.com/SerenityOS/serenity/commit/325263f0e8
Pull-request: https://github.com/SerenityOS/serenity/pull/15143
2 changed files with 6 additions and 20 deletions
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1
Tests/LibC/TestScanf.cpp
View file

@ -180,6 +180,7 @@ const TestSuite test_suites[] {
{ "%d %n", "1 a", 1, 2, { intarg0, intarg1 }, { to_value_t(1), to_value_t(2) } },
{ "%*d", " 42", 0, 0, {}, {} },
{ "%d%*1[:/]%d", "24/7", 2, 2, { intarg0, intarg1 }, { to_value_t(24), to_value_t(7) } },
{ " %[^a]", " b", 1, 1, { charstararg0 }, { str_to_value_t("b") } },
};
bool g_any_failed = false;

25
Userland/Libraries/LibC/scanf.cpp
View file

@ -62,8 +62,6 @@ template<typename ApT, ReadKind kind>
struct ReadElementConcrete<int, ApT, kind> {
bool operator()(GenericLexer& lexer, va_list* ap, bool suppress_assignment)
{
lexer.ignore_while(isspace);
long value = 0;
char* endptr = nullptr;
auto nptr = lexer.remaining().characters_without_null_termination();
@ -116,8 +114,6 @@ template<typename ApT, ReadKind kind>
struct ReadElementConcrete<unsigned, ApT, kind> {
bool operator()(GenericLexer& lexer, va_list* ap, bool suppress_assignment)
{
lexer.ignore_while(isspace);
unsigned long value = 0;
char* endptr = nullptr;
auto nptr = lexer.remaining().characters_without_null_termination();
@ -152,8 +148,6 @@ template<typename ApT, ReadKind kind>
struct ReadElementConcrete<long long, ApT, kind> {
bool operator()(GenericLexer& lexer, va_list* ap, bool suppress_assignment)
{
lexer.ignore_while(isspace);
long long value = 0;
char* endptr = nullptr;
auto nptr = lexer.remaining().characters_without_null_termination();
@ -188,8 +182,6 @@ template<typename ApT, ReadKind kind>
struct ReadElementConcrete<unsigned long long, ApT, kind> {
bool operator()(GenericLexer& lexer, va_list* ap, bool suppress_assignment)
{
lexer.ignore_while(isspace);
unsigned long long value = 0;
char* endptr = nullptr;
auto nptr = lexer.remaining().characters_without_null_termination();
@ -224,8 +216,6 @@ template<typename ApT, ReadKind kind>
struct ReadElementConcrete<float, ApT, kind> {
bool operator()(GenericLexer& lexer, va_list* ap, bool suppress_assignment)
{
lexer.ignore_while(isspace);
double value = 0;
char* endptr = nullptr;
auto nptr = lexer.remaining().characters_without_null_termination();
@ -299,7 +289,6 @@ struct ReadElement<char*, ReadKind::Normal> {
ReadElement(StringView scan_set = {}, bool invert = false)
: scan_set(scan_set.is_null() ? " \t\n\f\r"sv : scan_set)
, invert(scan_set.is_null() ? true : invert)
, was_null(scan_set.is_null())
{
}
@ -309,9 +298,6 @@ struct ReadElement<char*, ReadKind::Normal> {
if (length_modifier != LengthModifier::Default)
return false;
if (was_null)
input_lexer.ignore_while(isspace);
auto str = input_lexer.consume_while([this](auto c) { return this->matches(c); });
if (str.is_empty())
return false;
@ -333,7 +319,6 @@ private:
const StringView scan_set;
bool invert { false };
bool was_null { false };
};
template<>
@ -343,8 +328,6 @@ struct ReadElement<void*, ReadKind::Normal> {
if (length_modifier != LengthModifier::Default)
return false;
input_lexer.ignore_while(isspace);
auto str = input_lexer.consume_while([this](auto c) { return this->should_consume(c); });
if (count != 8) {
@ -395,10 +378,13 @@ extern "C" int vsscanf(char const* input, char const* format, va_list ap)
__builtin_va_copy(copy, ap);
while (!format_lexer.is_eof()) {
format_lexer.ignore_while(isspace);
if (format_lexer.next_is(isspace)) {
format_lexer.ignore_while(isspace);
input_lexer.ignore_while(isspace);
}
if (!format_lexer.next_is('%')) {
read_one_literal:;
input_lexer.ignore_while(isspace);
if (format_lexer.is_eof())
break;
@ -619,7 +605,6 @@ extern "C" int vsscanf(char const* input, char const* format, va_list ap)
++elements_matched;
break;
case ConversionSpecifier::OutputNumberOfBytes: {
input_lexer.ignore_while(isspace);
if (!suppress_assignment) {
auto* ptr = va_arg(copy, int*);
*ptr = input_lexer.tell();