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TP06/any2dec_inv.sh

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+#!/bin/bash
+#
+# any2dec.sh <radix> <string_representation_in_that_radix>
+#
+if [[ $# -lt 2 ]]
+then
+	echo "Usage: $0 <radix> <string_representation_in_that_radix>"
+	exit
+fi
+if [[ $1 -lt 2 || $1 -gt 36 ]]
+then
+	echo "The radix is a decimal between 2 and 36"
+	exit
+fi
+DIGITS=0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
+LEGAL_DIGITS=$(expr substr $DIGITS 1 $1)
+decimal=0
+l=$(expr length $2)
+for ((i=0;i<l;i++))
+do
+	digit=$(expr substr $2 $((i+1)) 1)
+	pos=$(expr index $LEGAL_DIGITS $digit)
+	if [[ pos -eq 0 ]]
+	then
+		echo "Authorized digits are : $LEGAL_DIGITS"; exit
+	fi
+	digit_val=$((pos-1))
+	decimal=$((decimal*$1+digit_val))
+done
+echo "decimal : $decimal"
+exit