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| author | Kartik K. Agaram <vc@akkartik.com> | 2021-07-03 18:27:01 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-07-03 18:27:01 -0700 |
| commit | c95648c96093ce0d44c21191bab0ee2c9b04becc (patch) | |
| tree | eb58e435a158100b99e152199b193acc53df4ab3 /113write-stream.subx | |
| parent | 7ced4e44ddb6e15152eb8bcef9dda68aba53710b (diff) | |
| download | mu-c95648c96093ce0d44c21191bab0ee2c9b04becc.tar.gz | |
reading from streams
The Mu shell has no string literals, only streams. No random access, only sequential access. But I've been playing fast and loose with its read pointer until now. Hopefully things are cleaned up now.
Diffstat (limited to '113write-stream.subx')
| -rw-r--r-- | 113write-stream.subx | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/113write-stream.subx b/113write-stream.subx index 7dd93fba..4478179b 100644 --- a/113write-stream.subx +++ b/113write-stream.subx @@ -158,6 +158,53 @@ test-write-stream-appends: # . end c3/return +# like write-stream, but don't update s->read +# is there a better name for this? +write-stream-immutable: # f: (addr stream byte), s: (addr stream byte) + # . prologue + 55/push-ebp + 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp + # . save registers + 50/push-eax + 56/push-esi + 57/push-edi + # edi = f + 8b/copy 1/mod/*+disp8 5/rm32/ebp . . 7/r32/edi 8/disp8 . # copy *(ebp+8) to edi + # esi = s + 8b/copy 1/mod/*+disp8 5/rm32/ebp . . 6/r32/esi 0xc/disp8 . # copy *(ebp+12) to esi + # eax = _append-4(&f->data[f->write], &f->data[f->size], &s->data[s->read], &s->data[s->write]) + # . . push &s->data[s->write] + 8b/copy 0/mod/indirect 6/rm32/esi . . . 0/r32/eax . . # copy *esi to eax + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/esi 0/index/eax . 0/r32/eax 0xc/disp8 . # copy esi+eax+12 to eax + 50/push-eax + # . . push &s->data[s->read] + 8b/copy 1/mod/*+disp8 6/rm32/esi . . . 0/r32/eax 4/disp8 . # copy *(esi+4) to eax + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/esi 0/index/eax . 0/r32/eax 0xc/disp8 . # copy esi+eax+12 to eax + 50/push-eax + # . . push &f->data[f->size] + 8b/copy 1/mod/*+disp8 7/rm32/edi . . . 0/r32/eax 8/disp8 . # copy *(edi+8) to eax + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 7/base/edi 0/index/eax . 0/r32/eax 0xc/disp8 . # copy edi+eax+12 to eax + 50/push-eax + # . . push &f->data[f->write] + 8b/copy 0/mod/indirect 7/rm32/edi . . . 0/r32/eax . . # copy *edi to eax + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 7/base/edi 0/index/eax . 0/r32/eax 0xc/disp8 . # copy edi+eax+12 to eax + 50/push-eax + # . . call + e8/call _append-4/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp + # f->write += eax + 01/add 0/mod/indirect 7/rm32/edi . . . 0/r32/eax . . # add eax to *edi +$write-stream-immutable:end: + # . restore registers + 5f/pop-to-edi + 5e/pop-to-esi + 58/pop-to-eax + # . epilogue + 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp + 5d/pop-to-ebp + c3/return + == data _test-stream2: # (stream byte) |