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LibC: Partially implement 'freopen'

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This commit is contained in:
AnotherTest 2020-08-30 15:13:28 +04:30 • committed by Andreas Kling
parent cb7526fca0
commit 9adbbff4dd
1 changed files with 32 additions and 4 deletions
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36
Libraries/LibC/stdio.cpp
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@ -77,6 +77,8 @@ public:
pid_t popen_child() { return m_popen_child; }
void set_popen_child(pid_t child_pid) { m_popen_child = child_pid; }
void reopen(int fd, int mode);
private:
struct Buffer {
// A ringbuffer that also transparently implements ungetc().
@ -415,6 +417,23 @@ long FILE::tell()
return lseek(m_fd, 0, SEEK_CUR);
}
void FILE::reopen(int fd, int mode)
{
// Dr. POSIX says: "Failure to flush or close the file descriptor
// successfully shall be ignored"
// and so we ignore any failures these two might have.
flush();
close();
// Just in case flush() and close() didn't drop the buffer.
m_buffer.drop();
m_fd = fd;
m_mode = mode;
m_error = 0;
m_eof = false;
}
FILE::Buffer::~Buffer()
{
if (m_data_is_malloced)
@ -967,10 +986,19 @@ FILE* fopen(const char* pathname, const char* mode)
FILE* freopen(const char* pathname, const char* mode, FILE* stream)
{
(void)pathname;
(void)mode;
(void)stream;
ASSERT_NOT_REACHED();
ASSERT(stream);
if (!pathname) {
// FIXME: Someone should probably implement this path.
TODO();
}
int flags = parse_mode(mode);
int fd = open(pathname, flags, 0666);
if (fd < 0)
return nullptr;
stream->reopen(fd, flags);
return stream;
}
FILE* fdopen(int fd, const char* mode)