79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
#include "devoptab_fsa.h"
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#include "logger.h"
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#include <mutex>
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off_t __fsa_seek(struct _reent *r,
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void *fd,
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off_t pos,
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int whence) {
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FSError status;
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FSAStat fsStat;
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uint64_t offset;
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if (!fd) {
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r->_errno = EINVAL;
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return -1;
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}
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auto *file = (__fsa_file_t *) fd;
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auto *deviceData = (FSADeviceData *) r->deviceData;
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std::lock_guard<MutexWrapper> lock(file->mutex);
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// Find the offset to see from
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switch (whence) {
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case SEEK_SET: { // Set absolute position; start offset is 0
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offset = 0;
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break;
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}
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case SEEK_CUR: { // Set position relative to the current position
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offset = file->offset;
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break;
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}
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case SEEK_END: { // Set position relative to the end of the file
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status = FSAGetStatFile(deviceData->clientHandle, file->fd, &fsStat);
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if (status < 0) {
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DEBUG_FUNCTION_LINE_ERR("FSAGetStatFile(0x%08X, 0x%08X, 0x%08X) (%s) failed: %s",
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deviceData->clientHandle, file->fd, &fsStat, file->fullPath, FSAGetStatusStr(status));
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r->_errno = __fsa_translate_error(status);
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return -1;
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}
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offset = fsStat.size;
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break;
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}
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default: { // An invalid option was provided
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r->_errno = EINVAL;
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return -1;
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}
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}
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if (pos < 0 && (off_t) offset < -pos) {
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// Don't allow seek to before the beginning of the file
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r->_errno = EINVAL;
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return -1;
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} else if (offset + pos > UINT32_MAX) {
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// Check for overflow
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r->_errno = EINVAL;
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return -1;
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}
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if ((uint32_t) (offset + pos) == file->offset) {
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return file->offset;
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}
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uint32_t old_pos = file->offset;
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file->offset = offset + pos;
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status = FSASetPosFile(deviceData->clientHandle, file->fd, file->offset);
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if (status < 0) {
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DEBUG_FUNCTION_LINE_ERR("FSASetPosFile(0x%08X, 0x%08X, 0x%08X) (%s) failed: %s",
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deviceData->clientHandle, file->fd, file->offset, file->fullPath, FSAGetStatusStr(status));
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file->offset = old_pos;
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r->_errno = __fsa_translate_error(status);
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return -1;
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}
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return file->offset;
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}
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