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-rw-r--r--src/util/system.cpp6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/util/system.cpp b/src/util/system.cpp
index bbd7c9940a..5a3c68aa0c 100644
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -1088,17 +1088,19 @@ void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length) {
SetEndOfFile(hFile);
#elif defined(MAC_OSX)
// OSX specific version
+ // NOTE: Contrary to other OS versions, the OSX version assumes that
+ // NOTE: offset is the size of the file.
fstore_t fst;
fst.fst_flags = F_ALLOCATECONTIG;
fst.fst_posmode = F_PEOFPOSMODE;
fst.fst_offset = 0;
- fst.fst_length = (off_t)offset + length;
+ fst.fst_length = length; // mac os fst_length takes the # of free bytes to allocate, not desired file size
fst.fst_bytesalloc = 0;
if (fcntl(fileno(file), F_PREALLOCATE, &fst) == -1) {
fst.fst_flags = F_ALLOCATEALL;
fcntl(fileno(file), F_PREALLOCATE, &fst);
}
- ftruncate(fileno(file), fst.fst_length);
+ ftruncate(fileno(file), static_cast<off_t>(offset) + length);
#else
#if defined(__linux__)
// Version using posix_fallocate