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blkdev: make load command stop and the end of the stream
This allows us to reliably and easily load a file until the end of it.
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parent
73c3fc7947
commit
95f1a8ddaf
@ -146,16 +146,6 @@ blkGetC:
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ld ix, (BLOCKDEV_GETC)
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jr _blkCall
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; Repeatedly call blkGetC until the call is a success.
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blkGetCW:
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ld ix, (BLOCKDEV_GETC)
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.loop:
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push ix ; fs messes with IX a lot
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call callIX
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pop ix
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jr nz, .loop
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ret
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; Reads B chars from blkGetC and copy them in (HL).
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; Sets Z if successful, unset Z if there was an error.
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blkRead:
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@ -45,9 +45,11 @@ blkSeekCmd:
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ret
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; Load the specified number of bytes (max 0xff) from IO and write them in the
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; current memory pointer (which doesn't change). This gets chars from
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; blkGetCW.
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; Control is returned to the shell only after all bytes are read.
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; current memory pointer (which doesn't change). If the blkdev hits end of
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; stream before we reach our specified number of bytes, we stop loading.
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;
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; Returns a SHELL_ERR_IO_ERROR only if we couldn't read any byte (if the first
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; call to GetC failed)
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;
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; Example: load 42
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blkLoadCmd:
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@ -59,11 +61,15 @@ blkLoad:
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ld a, (hl)
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ld b, a
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ld hl, (SHELL_MEM_PTR)
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.loop: call blkGetCW
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call blkGetC
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jr nz, .ioError
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.loop:
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ld (hl), a
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inc hl
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call blkGetC
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jr nz, .loopend
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djnz .loop
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.loopend:
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; success
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xor a
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jr .end
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