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LibCore: Let IODevice::can_read_line() buffer until \n or EOF

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If a line was larger than 1024 bytes or the file ended without a
newline character, can_read_line would return false.

IODevice::can_read_line() now reads until a newline is found or
EOF is reached.

fixes #5907
This commit is contained in:
r-paiva 2021-05-10 21:59:37 +01:00 committed by Andreas Kling
parent edcfbdf4bd
commit 943f4eb287
Notes: sideshowbarker 2024-07-18 17:40:14 +09:00 
Author: https://github.com/r-paiva
Commit: https://github.com/SerenityOS/serenity/commit/943f4eb2879
Pull-request: https://github.com/SerenityOS/serenity/pull/6738
Issue: https://github.com/SerenityOS/serenity/issues/5907
Reviewed-by: https://github.com/alimpfard ✅
Reviewed-by: https://github.com/linusg
2 changed files with 21 additions and 6 deletions
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2
AK/Vector.h
View File

@ -161,8 +161,6 @@ public:
return false;
}
// NOTE: Vector::is_null() exists for the benefit of String::copy().
bool is_null() const { return false; }
bool is_empty() const { return size() == 0; }
ALWAYS_INLINE size_t size() const { return m_size; }
size_t capacity() const { return m_capacity; }

25
Userland/Libraries/LibCore/IODevice.cpp
View File

@ -105,14 +105,31 @@ bool IODevice::can_read_line() const
{
if (m_eof && !m_buffered_data.is_empty())
return true;
if (m_buffered_data.contains_slow('\n'))
return true;
if (!can_read_from_fd())
return false;
populate_read_buffer();
if (m_eof && !m_buffered_data.is_empty())
return true;
return m_buffered_data.contains_slow('\n');
while (true) {
// Populate buffer until a newline is found or we reach EOF.
auto previous_buffer_size = m_buffered_data.size();
populate_read_buffer();
auto new_buffer_size = m_buffered_data.size();
if (m_error)
return false;
if (m_eof)
return !m_buffered_data.is_empty();
if (m_buffered_data.contains_in_range('\n', previous_buffer_size, new_buffer_size - 1))
return true;
}
return true;
}
bool IODevice::can_read() const