todec

   1 #!/bin/sh
   2
   3 conv() {
   4         while [ $# -gt 0 ]; do
   5                 if printf "%s" "$1" | grep -qE '^0b[0-1]+$'; then
   6                         if [ "$m" -eq 0 ]; then
   7                                 printf "Binary %s → Decimal: " "$1"
   8                         fi
   9                         t=$(printf "%s" "$1" | sed 's/^0b//')
  10                         printf "ibase=2; %s / %s" "$t" "$k" | bc | tr -d '\n' && printf "%s\n" "$p"
  11
  12                 elif printf "%s" "$1" | grep -qE '^([0-9A-Fa-f]+|0x[0-9A-Fa-f]+)$'; then
  13                         if [ "$m" -eq 0 ]; then
  14                                 printf "Hex %s → Decimal: " "$1"
  15                         fi
  16                         t=$(printf "%s" "$1" | sed 's/^0x//')
  17                         printf "ibase=16; %s / %X" "$(printf "%s" "$t" | sed 'y/abcdef/ABCDEF/')" "0b$k" | bc | tr -d '\n' && printf "%s\n" "$p"
  18
  19                 else
  20                         printf "Error: '%s' is not a valid decimal or hexadecimal number\n" "$1" >&2
  21                         stat=1
  22
  23                 fi
  24                 shift
  25         done
  26         return "$stat"
  27 }
  28
  29
  30 main() {
  31         if ! [ "$1" = "x" ] && ! [ -t 0 ]; then
  32                 cat | tr '\n' ' ' | xargs todec "x" "$@"
  33                 return "$?"
  34
  35         elif [ "$1" = "x" ]; then
  36                 shift
  37
  38         fi
  39
  40         if [ $# -eq 0 ]; then
  41                 printf "Error: No arguments provided\nusage: todec [-mn] number1 number2 ...\n" >&2
  42                 return 2
  43
  44         fi
  45
  46         stat=0
  47         k=1; m=0; n=0; p='';
  48         while getopts "bmnKMG" flag; do
  49                 case "$flag" in
  50                         m) m=1; ;;
  51                         n) n=1; ;;
  52                         # 1024
  53                         K) k=10000000000; p='K'; ;;
  54                         # 1 048 576
  55                         M) k=100000000000000000000; p='M'; ;;
  56                         # 1 073 741 824
  57                         G) k=1000000000000000000000000000000; p='G'; ;;
  58                         *) printf "usage: todec [-mnKMG] number1 number2 ...\n" >&2 ; return 2 ;;
  59                 esac
  60         done
  61
  62         shift $(( OPTIND - 1 ))
  63
  64         t=$(conv "$@")
  65         stat=$?
  66
  67         if [ "$n" -eq 1 ] && [ "$m" -eq 1 ]; then
  68                 t=$(printf "%s" "$t" | tr '\n' ' ')
  69
  70         elif [ "$n" -eq 1 ] && [ "$m" -eq 0 ]; then
  71                 t=$(printf "%s" "$t" | tr '\n' ';')
  72
  73         else
  74                 t=$(printf "%s" "$t")
  75
  76         fi
  77
  78         printf "%s\n" "$t"
  79         return "$stat"
  80 }
  81
  82 main "$@"