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Return FALSE on seek past EOF (#7324)

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Fixes #7323

While I'm not a fan, the Arduino FileSeek API online shows that a seek()
past EOF should return FALSE.
https://www.arduino.cc/en/Reference/FileSeek

SPIFFS and SDFS obey this, but LittleFS followed the POSIX standard or
allowing seeks past EOF.

Update LittleFS::seek() to follow the Arduino API and add tests for it.
This commit is contained in:
Earle F. Philhower, III
2020-05-30 21:47:53 -07:00
committed by GitHub
parent 27ef03fc05
commit 8ee67ab2b5
2 changed files with 29 additions and 0 deletions
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5
libraries/LittleFS/src/LittleFS.h
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@ -377,11 +377,16 @@ public:
if (mode == SeekEnd) {
offset = -offset; // TODO - this seems like its plain wrong vs. POSIX
}
auto lastPos = position();
int rc = lfs_file_seek(_fs->getFS(), _getFD(), offset, (int)mode); // NB. SeekMode === LFS_SEEK_TYPES
if (rc < 0) {
DEBUGV("lfs_file_seek rc=%d\n", rc);
return false;
}
if (position() > size()) {
seek(lastPos, SeekSet); // Pretend the seek() never happened
return false;
}
return true;
}