mirror of
https://github.com/wiiu-env/wut.git
synced 2024-12-14 02:51:51 +01:00
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
#include "devoptab_sd.h"
|
|
|
|
off_t
|
|
__wut_fs_seek(struct _reent *r,
|
|
void *fd,
|
|
off_t pos,
|
|
int whence)
|
|
{
|
|
FSStatus rc;
|
|
u64 offset;
|
|
__wut_fs_file_t *file = (__wut_fs_file_t *)fd;
|
|
|
|
// Set up command block
|
|
FSCmdBlock fsCmd;
|
|
FSInitCmdBlock(&fsCmd);
|
|
|
|
FSStat fsstat;
|
|
rc = FSGetStatFile(__wut_devoptab_sd_client, &fsCmd, file->fd, &fsstat, -1);
|
|
|
|
if (rc < 0) {
|
|
r->_errno = __wut_fs_translate_error(rc);
|
|
return -1;
|
|
}
|
|
|
|
// Find the offset to see from
|
|
switch(whence) {
|
|
// Set absolute position; start offset is 0
|
|
case SEEK_SET:
|
|
offset = 0;
|
|
break;
|
|
|
|
// Set position relative to the current position
|
|
case SEEK_CUR:
|
|
offset = file->offset;
|
|
break;
|
|
|
|
// Set position relative to the end of the file
|
|
case SEEK_END:
|
|
offset = fsstat.size;
|
|
break;
|
|
|
|
// An invalid option was provided
|
|
default:
|
|
r->_errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
// TODO: A better check that prevents overflow.
|
|
if(pos < 0 && offset < -pos) {
|
|
// Don't allow seek to before the beginning of the file
|
|
r->_errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
// Update the current offset
|
|
file->offset = offset + pos;
|
|
FSStatus result = FSSetPosFile(__wut_devoptab_sd_client, &fsCmd, file->fd, file->offset, -1);
|
|
|
|
if (result < 0) {
|
|
return result;
|
|
}
|
|
|
|
return file->offset;
|
|
}
|