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Remove inaccurate error behavior

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Seek can have offsets past the end of a file.
Also add logging for two valid whence values that are unsupported on Windows.
I'll need to verify that SEEK_HOLE and SEEK_DATA correspond to 3 and 4 respectively, I've yet to check source to verify.
This commit is contained in:
Stephen Miller 2025-03-24 12:52:30 -05:00
parent 62a8eda2bd
commit b2c3da432c
3 changed files with 11 additions and 4 deletions
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4
src/common/io_file.cpp
View File

@ -125,12 +125,14 @@ namespace {
[[nodiscard]] constexpr int ToSeekOrigin(SeekOrigin origin) {
switch (origin) {
case SeekOrigin::SetOrigin:
default:
return SEEK_SET;
case SeekOrigin::CurrentPosition:
return SEEK_CUR;
case SeekOrigin::End:
return SEEK_END;
default:
LOG_ERROR(Core, "Unsupported origin {}, defaulting to SEEK_SET", origin);
return SEEK_SET;
}
}

2
src/common/io_file.h
View File

@ -61,6 +61,8 @@ enum class SeekOrigin : u32 {
SetOrigin, // Seeks from the start of the file.
CurrentPosition, // Seeks from the current file pointer position.
End, // Seeks from the end of the file.
SeekHole, // Seeks from the start of the next hole in the file.
SeekData, // Seeks from the start of the next non-hole region in the file.
};
class IOFile final {

9
src/core/libraries/kernel/file_system.cpp
View File

@ -367,6 +367,10 @@ s64 PS4_SYSV_ABI posix_lseek(s32 fd, s64 offset, s32 whence) {
origin = Common::FS::SeekOrigin::CurrentPosition;
} else if (whence == 2) {
origin = Common::FS::SeekOrigin::End;
} else if (whence == 3) {
origin = Common::FS::SeekOrigin::SeekHole;
} else if (whence == 4) {
origin = Common::FS::SeekOrigin::SeekData;
} else {
// whence parameter is invalid
*__Error() = POSIX_EINVAL;
@ -377,10 +381,9 @@ s64 PS4_SYSV_ABI posix_lseek(s32 fd, s64 offset, s32 whence) {
if (errno != 0) {
// Seek failed in platform-specific code, errno needs to be converted.
SetPosixErrno(errno);
} else {
// Seek failed because offset is beyond the end of the file.
*__Error() = POSIX_ENXIO;
return -1;
}
// Shouldn't be possible, but just in case.
return -1;
}