day7/computer.sh

   1 #!/bin/bash
   2
   3 declare -a data
   4
   5 run_program() {
   6     local -n od=$1
   7     data=("${od[@]}")
   8     pos=0
   9     declare -a immediate
  10     while [ $pos -le ${#data[@]} ]; do
  11         # first, printf the value to 5 digits
  12         instruction=$(printf "%05d" ${data[$pos]})
  13         for (( a=0; a<3; a++ )); do
  14             immediate[$((3-a))]=${instruction:$a:1}
  15         done
  16         instruction=${instruction:3}
  17         param_count=3
  18         case $instruction in
  19             01|02)
  20                 # 01 - add, 02 multiply
  21                 symbol="+"
  22                 if [ $instruction == "02" ]; then
  23                     symbol="*"
  24                 fi
  25                 val1=${data[$((pos+1))]}
  26                 val2=${data[$((pos+2))]}
  27                 res_loc=${data[$((pos+3))]}
  28                 if [ ${immediate[1]} -eq 0 ]; then
  29                     val1=${data[$val1]}
  30                 fi
  31                 if [ ${immediate[2]} -eq 0 ]; then
  32                     val2=${data[$val2]}
  33                 fi
  34                 data[$res_loc]=$(($val1 $symbol $val2))
  35                 ;;
  36             03)
  37                 # 03 - read input
  38                 read -p "input: " input
  39                 res_loc=${data[$((pos+1))]}
  40                 data[$res_loc]=$input
  41                 param_count=1
  42                 ;;
  43             04)
  44                 # 04 - output
  45                 if [ ${immediate[1]} -eq 1 ]; then
  46                     echo ${data[$((pos+1))]}
  47                 else
  48                     res_loc=${data[$((pos+1))]}
  49                     echo ${data[$res_loc]}
  50                 fi
  51                 param_count=1
  52                 ;;
  53             05|06)
  54                 # 05 - jump-if-true, 06 - jump-if-false
  55                 val=${data[$((pos+1))]}
  56                 jumpto=${data[$((pos+2))]}
  57                 param_count=2
  58                 if [ ${immediate[1]} -eq 0 ]; then
  59                     val=${data[$val]}
  60                 fi
  61                 if [ ${immediate[2]} -eq 0 ]; then
  62                     jumpto=${data[$jumpto]}
  63                 fi
  64                 if ( [ $val -ne 0 ] && [ "$instruction" == "05" ] ) ||
  65                     ( [ $val -eq 0 ] && [ "$instruction" == "06" ] ); then
  66                     pos=$jumpto
  67                     continue
  68                 fi
  69                 ;;
  70             07|08)
  71                 # 07 - is less than, 08 - is equal
  72                 val1=${data[$((pos+1))]}
  73                 val2=${data[$((pos+2))]}
  74                 res_pos=${data[$((pos+3))]}
  75                 if [ ${immediate[1]} -eq 0 ]; then
  76                     val1=${data[$val1]}
  77                 fi
  78                 if [ ${immediate[2]} -eq 0 ]; then
  79                     val2=${data[$val2]}
  80                 fi
  81                 data[$res_pos]=0
  82                 if [ "$instruction" == "07" ]; then
  83                     if [ $val1 -lt $val2 ]; then
  84                         data[$res_pos]=1
  85                     fi
  86                 else
  87                     if [ $val1 -eq $val2 ]; then
  88                         data[$res_pos]=1
  89                     fi
  90                 fi
  91                 ;;
  92             99)
  93                 break
  94                 ;;
  95             *)
  96                 echo "Invalid opcode: $instruction at position $pos"
  97                 exit 1
  98         esac
  99         pos=$(($pos+$param_count+1))
 100     done
 101 }
 102