=> R0 = reason code
R1 = pointer to filename
R3 = FileSwitch file handle which will be allocated
R6 = pointer to special field, or 0 if not present
<= R0 = file information word
R1 = internal file handle, or 0 if unable to open
R2 = buffer for FileSwitch to use, or 0 if unbuffered (powers of 2 from 64 to 1024, plus 2048 from RISC OS 3.60+, plus 4096 from RISC OS 5.20+)
R3 = file extent if buffered
R4 = space allocated to file if buffered (must be a multiple of R2)
This entry point is called when an attempt is made to access a file inside an image. The internal file handle will be referred to by FileSwitch in subsequent file accesses if the file was successfully opened.
File information word
Bit Meaning
31 Writes are allowed
30 Reads are allowed
29 File is a directory
28 Unbuffered OS_GBPB supported (only if stream-type)
27 Stream is interactive
FSEntry_Open reasons
Reason Meaning
0 File is opening for read
1 File is being created and opened for update
2 File is opening for update
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