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Use CLUSTER_ERROR when an error occurs with the FAT, not CLUSTER_FREE

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This commit is contained in:
Michael Chisholm 2007-10-25 12:55:18 +00:00
parent 8c319ec76a
commit def250bd28
2 changed files with 24 additions and 4 deletions
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20
source/file_allocation_table.c
View File

@ -35,7 +35,7 @@
2006-10-01 - Chishm 2006-10-01 - Chishm
* Added _FAT_fat_linkFreeClusterCleared to clear a cluster when it is allocated * Added _FAT_fat_linkFreeClusterCleared to clear a cluster when it is allocated
2007-09-01 - Chishm 2007-10-25 - Chishm
* Use CLUSTER_ERROR when an error occurs with the FAT, not CLUSTER_FREE * Use CLUSTER_ERROR when an error occurs with the FAT, not CLUSTER_FREE
*/ */
@ -332,3 +332,21 @@ u32 _FAT_fat_lastCluster (PARTITION* partition, u32 cluster) {
} }
return cluster; return cluster;
} }
/*-----------------------------------------------------------------
_FAT_fat_freeClusterCount
Return the number of free clusters available
-----------------------------------------------------------------*/
u32 _FAT_fat_freeClusterCount (PARTITION* partition) {
u32 count = 0;
u32 curCluster;
for (curCluster = CLUSTER_FIRST; curCluster <= partition->fat.lastCluster; curCluster++) {
if (_FAT_fat_nextCluster(partition, curCluster) == CLUSTER_FREE) {
count++;
}
}
return count;
}

4
source/file_allocation_table.h
View File

@ -32,7 +32,7 @@
2006-10-01 - Chishm 2006-10-01 - Chishm
* Added _FAT_fat_linkFreeClusterCleared to clear a cluster when it is allocated * Added _FAT_fat_linkFreeClusterCleared to clear a cluster when it is allocated
2007-09-01 - Chishm 2007-10-25 - Chishm
* Use CLUSTER_ERROR when an error occurs with the FAT, not CLUSTER_FREE * Use CLUSTER_ERROR when an error occurs with the FAT, not CLUSTER_FREE
*/ */
@ -61,6 +61,8 @@ bool _FAT_fat_clearLinks (PARTITION* partition, u32 cluster);
u32 _FAT_fat_lastCluster (PARTITION* partition, u32 cluster); u32 _FAT_fat_lastCluster (PARTITION* partition, u32 cluster);
u32 _FAT_fat_freeClusterCount (PARTITION* partition);
static inline u32 _FAT_fat_clusterToSector (PARTITION* partition, u32 cluster) { static inline u32 _FAT_fat_clusterToSector (PARTITION* partition, u32 cluster) {
return (cluster >= CLUSTER_FIRST) ? ((cluster - CLUSTER_FIRST) * partition->sectorsPerCluster) + partition->dataStart : partition->rootDirStart; return (cluster >= CLUSTER_FIRST) ? ((cluster - CLUSTER_FIRST) * partition->sectorsPerCluster) + partition->dataStart : partition->rootDirStart;
} }