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Fixed seek to end of file when reading

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This commit is contained in:
Michael Chisholm 2007-04-12 01:06:35 +00:00
parent cdc8378826
commit c394419d72
1 changed files with 6 additions and 3 deletions
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9
source/fatfile.c
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@ -45,6 +45,9 @@
2007-02-25 - Chishm 2007-02-25 - Chishm
* Fixed seek to the end of a file bug * Fixed seek to the end of a file bug
2007-04-12 - Chishm
* Fixed seek to end of file when reading
*/ */
@ -792,7 +795,7 @@ int _FAT_seek_r (struct _reent *r, int fd, int pos, int dir) {
file->rwPosition.byte = position % BYTES_PER_READ; file->rwPosition.byte = position % BYTES_PER_READ;
// Calculate where the correct cluster is // Calculate where the correct cluster is
if (position >= file->currentPosition) { if ((position >= file->currentPosition) && (file->rwPosition.sector != partition->sectorsPerCluster)) {
clusCount = (position / partition->bytesPerCluster) - (file->currentPosition / partition->bytesPerCluster); clusCount = (position / partition->bytesPerCluster) - (file->currentPosition / partition->bytesPerCluster);
cluster = file->rwPosition.cluster; cluster = file->rwPosition.cluster;
} else { } else {
@ -807,9 +810,9 @@ int _FAT_seek_r (struct _reent *r, int fd, int pos, int dir) {
nextCluster = _FAT_fat_nextCluster (partition, cluster); nextCluster = _FAT_fat_nextCluster (partition, cluster);
} }
// Check if ran out of clusters, and the file is being written to // Check if ran out of clusters and it needs to allocate a new one
if (clusCount > 0) { if (clusCount > 0) {
if ((clusCount == 1) && (file->filesize == position) && (file->write || file->append) && (file->rwPosition.sector == 0)) { if ((clusCount == 1) && (file->filesize == position) && (file->rwPosition.sector == 0)) {
// Set flag to allocate a new cluster // Set flag to allocate a new cluster
file->rwPosition.sector = partition->sectorsPerCluster; file->rwPosition.sector = partition->sectorsPerCluster;
file->rwPosition.byte = 0; file->rwPosition.byte = 0;