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Fixed seek to the end of a file bug

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This commit is contained in:
Michael Chisholm 2007-02-25 09:51:47 +00:00
parent c26b60e6e0
commit be7f9f10fb
1 changed files with 28 additions and 12 deletions
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40
source/fatfile.c
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@ -42,6 +42,9 @@
2007-02-11 - Chishm
* Propagate disc errors up to the user app
2007-02-25 - Chishm
* Fixed seek to the end of a file bug
*/
@ -458,6 +461,17 @@ static bool file_extend_r (struct _reent *r, FILE_STRUCT* file) {
remain = file->currentPosition - file->filesize;
if ((remain > 0) && (file->filesize > 0) && (position.sector == 0)) {
// Get a new cluster on the edge of a cluster boundary
tempNextCluster = _FAT_fat_linkFreeCluster(partition, position.cluster);
if (tempNextCluster == CLUSTER_FREE) {
// Couldn't get a cluster, so abort
r->_errno = ENOSPC;
return false;
} else {
position.cluster = tempNextCluster;
}
}
// Only need to clear to the end of the sector
if (remain + position.byte < BYTES_PER_READ) {
@ -477,11 +491,8 @@ static bool file_extend_r (struct _reent *r, FILE_STRUCT* file) {
while (remain >= BYTES_PER_READ) {
if (position.sector >= partition->sectorsPerCluster) {
position.sector = 0;
tempNextCluster = _FAT_fat_nextCluster(partition, position.cluster);
if ((tempNextCluster == CLUSTER_EOF) || (tempNextCluster == CLUSTER_FREE)) {
// Ran out of clusters so get a new one
tempNextCluster = _FAT_fat_linkFreeCluster(partition, position.cluster);
}
// Ran out of clusters so get a new one
tempNextCluster = _FAT_fat_linkFreeCluster(partition, position.cluster);
if (tempNextCluster == CLUSTER_FREE) {
// Couldn't get a cluster, so abort
r->_errno = ENOSPC;
@ -772,9 +783,9 @@ int _FAT_seek_r (struct _reent *r, int fd, int pos, int dir) {
return -1;
}
// Only change the read/write position if it is within the bounds of the current filesize
if (file->filesize > position) {
// Only change the read/write position if it is within the bounds of the current filesize,
// or at the very edge of the file
if (file->filesize >= position) {
// Calculate the sector and byte of the current position,
// and store them
file->rwPosition.sector = (position % partition->bytesPerCluster) / BYTES_PER_READ;
@ -797,10 +808,15 @@ int _FAT_seek_r (struct _reent *r, int fd, int pos, int dir) {
}
// Check if ran out of clusters, and the file is being written to
if ((clusCount > 0) && (file->write || file->append)) {
// Set flag to allocate a new cluster
file->rwPosition.sector = partition->sectorsPerCluster;
file->rwPosition.byte = 0;
if (clusCount > 0) {
if ((clusCount == 1) && (file->filesize == position) && (file->write || file->append) && (file->rwPosition.sector == 0)) {
// Set flag to allocate a new cluster
file->rwPosition.sector = partition->sectorsPerCluster;
file->rwPosition.byte = 0;
} else {
r->_errno = EINVAL;
return -1;
}
}
file->rwPosition.cluster = cluster;