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-rw-r--r--apps/advent2020/2a.mu92
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diff --git a/apps/advent2020/2a.mu b/apps/advent2020/2a.mu
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-# https://adventofcode.com/2020/day/2
-#
-# To run (on Linux):
-#   $ git clone https://github.com/akkartik/mu
-#   $ cd mu
-#   $ ./translate_mu apps/advent2020/2a.mu
-#   $ ./a.elf < input
-#
-# You'll need to register to download the 'input' file for yourself.
-
-fn main -> _/ebx: int {
-  var valid-password-count/edi: int <- copy 0
-  var line-storage: (stream byte 0x100)  # 256 bytes
-  var line/edx: (addr stream byte) <- address line-storage
-  var slice-storage: slice
-  var slice/ecx: (addr slice) <- address slice-storage
-  {
-    # read line from stdin
-    clear-stream line
-    read-line-from-real-keyboard line
-    # if line is empty (not even a newline), quit
-    var done?/eax: boolean <- stream-empty? line
-    compare done?, 0/false
-    break-if-!=
-    print-stream-to-real-screen line
-    # slice = next-token(line, '-')
-    next-token line, 0x2d, slice
-    # start = parse-int(slice)
-    var _start/eax: int <- parse-decimal-int-from-slice slice
-    var start/ebx: int <- copy _start
-    var dash/eax: byte <- read-byte line  # skip '-'
-    # slice = next-token(line, ' ')
-    next-token line, 0x20, slice
-    var _end/eax: int <- parse-decimal-int-from-slice slice
-    var end/esi: int <- copy _end
-    print-int32-decimal 0, start
-    print-string 0, " "
-    print-int32-decimal 0, end
-    print-string 0, "\n"
-    # letter = next non-space
-    skip-chars-matching-whitespace line
-    var letter/eax: byte <- read-byte line
-    # skip some stuff
-    {
-      var colon/eax: byte <- read-byte line  # skip ':'
-    }
-    skip-chars-matching-whitespace line
-    # now check the rest of the line
-    var is-valid?/eax: boolean <- is-valid? start, end, letter, line
-    compare is-valid?, 0/false
-    {
-      break-if-=
-      print-string 0, "valid!\n"
-      valid-password-count <- increment
-    }
-    loop
-  }
-  print-int32-decimal 0, valid-password-count
-  print-string 0, "\n"
-  return 0
-}
-
-fn is-valid? start: int, end: int, letter: byte, password: (addr stream byte) -> _/eax: boolean {
-  var letter-count/edi: int <- copy 0
-  # for every c in password
-  #   if (c == letter)
-  #     ++letter-count
-  {
-    var done?/eax: boolean <- stream-empty? password
-    compare done?, 0/false
-    break-if-!=
-    var c/eax: byte <- read-byte password
-    compare c, letter
-    {
-      break-if-!=
-      letter-count <- increment
-    }
-    loop
-  }
-  # return (start <= letter-count <= end)
-  compare letter-count, start
-  {
-    break-if->=
-    return 0/false
-  }
-  compare letter-count, end
-  {
-    break-if-<=
-    return 0/false
-  }
-  return 1/true
-}