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libc_fs: return resulting offset in 'lseek()'

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Fixes #314.
This commit is contained in:
Christian Prochaska 2012-08-02 15:02:09 +02:00 committed by Norman Feske
parent 914897cf71
commit 23772b620f
1 changed files with 15 additions and 3 deletions
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18
libports/src/lib/libc_fs/plugin.cc
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@ -227,6 +227,16 @@ static void obtain_stat_for_node(File_system::Node_handle node_handle,
class Plugin : public Libc::Plugin
{
private:
::off_t _file_size(Libc::File_descriptor *fd)
{
struct stat stat_buf;
if (fstat(fd, &stat_buf) == -1)
return -1;
return stat_buf.st_size;
}
public:
/**
@ -399,11 +409,13 @@ class Plugin : public Libc::Plugin
case SEEK_SET:
context(fd)->seek_offset(offset);
return 0;
return offset;
case SEEK_CUR:
context(fd)->advance_seek_offset(offset);
return 0;
if (context(fd)->is_appending())
return _file_size(fd);
return context(fd)->seek_offset();
case SEEK_END:
if (offset != 0) {
@ -411,7 +423,7 @@ class Plugin : public Libc::Plugin
return -1;
}
context(fd)->infinite_seek_offset();
return 0;
return _file_size(fd);
default:
errno = EINVAL;