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add alternative path (compile time determined) if attempt to write >4GB should fail whole write or succeed but only up to 4GB (based on email from Tom)

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Kenneth J Davis 2025-03-28 17:04:59 -04:00
parent 767cafa737
commit 7fd6a6b71b
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1 changed files with 6 additions and 0 deletions
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kernel/fatfs.c
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@ -1249,8 +1249,14 @@ long rwblock(COUNT fd, VOID FAR * buffer, UCOUNT count, int mode)
{ {
if (mode == XFR_WRITE) if (mode == XFR_WRITE)
{ {
#if 1 /* we fail write call even if could partially succeed */
/* can't extend beyond 4G so return '0 byte written, DISK_FULL */ /* can't extend beyond 4G so return '0 byte written, DISK_FULL */
return DE_HNDLDSKFULL; return DE_HNDLDSKFULL;
#else
/* truncate request to max size can write */
ULONG max_count = (ULONG)-1 - fnp->f_offset;
count = (max_count >= (UCOUNT)-1)?(UCOUNT)-1:(UCOUNT)max_count;
#endif
} }
/* else XFR_READ should end automatically at EOF */ /* else XFR_READ should end automatically at EOF */
} }