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LibCore: Add Core::IODevice::truncate()

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This is just a wrapper around ftruncate(). Today I also learned that
ftruncate() does not reset the file descriptor offset. :^)
This commit is contained in:
Andreas Kling 2020-09-06 16:09:26 +02:00
parent 9dafbc82ff
commit 35b844ba4c
Notes: sideshowbarker 2024-07-19 02:53:26 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/35b844ba4c8
2 changed files with 12 additions and 0 deletions
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10
Libraries/LibCore/IODevice.cpp
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@ -266,6 +266,16 @@ bool IODevice::seek(i64 offset, SeekMode mode, off_t* pos)
return true;
}
bool IODevice::truncate(off_t size)
{
int rc = ftruncate(m_fd, size);
if (rc < 0) {
set_error(errno);
return false;
}
return true;
}
bool IODevice::write(const u8* data, int size)
{
int rc = ::write(m_fd, data, size);

2
Libraries/LibCore/IODevice.h
View file

@ -65,6 +65,8 @@ public:
bool write(const u8*, int size);
bool write(const StringView&);
bool truncate(off_t);
bool can_read_line() const;
bool can_read() const;