OS_FSControl 46 (changes)

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Programmer's OS Reference SWI Manuals Calls

» Part OS_FSControl 15 – SWI Calls

» OS_FSControl 46OS

OS_ FSControl 46

(SWI &29)

Use

The purpose of this call is to returns an image file’s used space map.

Notes

This SWI writes the image used space map to the buffer, 1 bits signifying used blocks, 0 bits free blocks. Bit 0 in a byte comes before bit 7.

This SWI sets bits up to min( buffer size, file size / block size ). Block size for a file can be read with OS_File 24. For a non-image file the buffer will be filled with ones.

See also

• OS_FSControl
• OS_File 24