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| -rw-r--r-- | ex9.mu | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/ex9.mu b/ex9.mu new file mode 100644 index 00000000..711b2e48 --- /dev/null +++ b/ex9.mu @@ -0,0 +1,51 @@ +# Demo of reading and writing to disk. +# +# Steps for trying it out: +# 1. Translate this example into a disk image disk.img. +# ./translate ex9.mu +# 2. Build a second disk image data.img containing some text. +# dd if=/dev/zero of=data.img count=20160 +# echo 'abc def ghi' |dd of=data.img conv=notrunc +# 3. Familiarize yourself with how the data disk looks within xxd: +# xxd data.img |head +# 4. Run in an emulator, either Qemu or Bochs. +# qemu-system-i386 -hda disk.img -hdb data.img +# bochs -f bochsrc.2disks +# 5. Exit the emulator. +# 6. Notice that the data disk now contains the word count of the original text. +# xxd data.img |head + +fn main { + var text-storage: (stream byte 0x200) + var text/esi: (addr stream byte) <- address text-storage + load-first-sector-from-primary-bus-secondary-drive text + + var word-count/eax: int <- word-count text + + var result-storage: (stream byte 0x10) + var result/edi: (addr stream byte) <- address result-storage + write-int32-decimal result, word-count + store-first-sector-to-primary-bus-secondary-drive result +} + +fn word-count in: (addr stream byte) -> _/eax: int { + var result/edi: int <- copy 0 + { + var done?/eax: boolean <- stream-empty? in + compare done?, 0/false + break-if-!= + var g/eax: grapheme <- read-grapheme in + { + compare g, 0x20/space + break-if-!= + result <- increment + } + { + compare g, 0xa/newline + break-if-!= + result <- increment + } + loop + } + return result +} |