Solution to the 337 UVa Judge problem

337.c

/* Solution to the UVa Online Judge problem no. 337 */

#include <stdio.h>
#include <stdlib.h>

int row, column, insmode = 0, ctrlseq = 0;

char display[10][10];


void display_reset() {
	int i, j;
	for (i = 0; i < 10; i++) {
		for (j = 0; j < 10; j++) {
			display[i][j] = ' ';		
		}	
	}	
	row = column = 0;
}

void display_print() {
	int i, j;
	printf("+----------+\n");
	for (i = 0; i < 10; i++) {
		printf("|");
		for (j = 0; j < 10; j++) {
			printf("%c", display[i][j]);
		}	
		printf("|\n");
	}	
	printf("+----------+\n");
}

void writechar(char c) {
	if (c == '\n') {
		return;
	}

	if (insmode) {
		int i;
		for (i = 9; i > column; i--) {
			display[row][i] = display[row][i-1];
		}
	}

	display[row][column] = c;

	if (column < 9) {
		column += 1;
	}
}

void action(char c) {
	int i, j;
	switch (c) {
		case 'r':
			if (column < 9) {
				column += 1;
			}
		break;
		case 'l':
			if (column > 0) {
				column -= 1;
			}
		break;
		case 'd':
			if (row < 9) {
				row += 1;
			}
		break;
		case 'u':
			if (row > 0) {
				row -= 1;
			}
		break;
		case 'b':
			column = 0;
		break;
		case 'h':
			row = 0;
			column = 0;
		break;
		case 'c':
			i = row;
			j = column;
			display_reset();
			row = i;
			column = j;
		break;
		case 'e':
			for (i = column; i < 10; i++) {
				display[row][i] = ' ';
			}
		break;
		case 'i':
			insmode = 1;
		break;
		case 'o':
			insmode = 0;
		break;
	}
}

int main(void) {
	int i, n, casenum = 1;
	char sign;

	while (scanf("%d\n", &n) == 1) {
		if (n == 0) { /* Last line */
			return 0;
		}

		display_reset();
		for (i = 0; i < n; i++) {
			for (;;) {
				sign = getchar();	
				if ((sign != '^' && !ctrlseq) || (sign == '^' && ctrlseq)) {
					if (sign == '\n') {
						break;
					}
					writechar(sign);
					ctrlseq = 0;

				} else if (sign == '^') {
					ctrlseq = 1;

				} else if (ctrlseq && sign >= '0' && sign <= '9') {
					row = sign - '0';
					column = getchar() - '0';
					ctrlseq = 0;

				} else {
					action(sign);
					ctrlseq = 0;
				}
					
			}
		}

		printf("Case %d\n", casenum++);
		display_print();
	}

	return 0;
}

337.rb

#!/usr/bin/env ruby

class Display
   attr_accessor :data, :row, :col, :insertmode

   def initialize
      reset
   end

   def reset
      @data = Array.new(10) { Array.new(10) {' '} }
      @insertmode = false 
      @row = @col = 0
   end

   def print_display
      puts "+----------+"
      @data.each do |row|
         print "|"
         row.each do |value|
            print value
         end
         puts "|"
      end
      puts "+----------+"
   end

   def write(sign)
      return if sign.include?("\n")

      if @insertmode
         i = 9
         until i == @col do
            @data[@row][i] = @data[@row][i - 1]
            i -= 1
         end
      end

      @data[@row][@col] = sign
      @col += 1 if @col < 9
   end
end


def action(display, key)
   case key
   when 'r'
      display.col += 1 if display.col < 9
   when 'l'
      display.col -= 1 if display.col > 0
   when 'd'
      display.row += 1 if display.row < 9
   when 'u'
      display.row -= 1 if display.row > 0
   when 'b'
      display.col = 0
   when 'h'
      display.col = 0
      display.row = 0
   when 'c'
      col = display.col
      row = display.row
      display.reset
      display.col = col
      display.row = row
   when 'e'
      for i in (display.col..9)
         display.data[display.row][i] = ' '
      end
   when 'i'
      display.insertmode = true 
   when 'o'
      display.insertmode = false 
   when '^'
      display.write '^'
   end
end

def process_line(display, line)
   rowset = control = false
   line.each_char do |c|
      unless control
         control = c == "^"
         unless control
            display.write c
         end
      else
         if '0' <= c and c <= '9'
            unless rowset
               display.row = c.to_i
               rowset = true

               next # skip iteration 
            else
               display.col = c.to_i
               rowset = false
            end
         else
            action display, c
         end
         control = false
      end
   end
end


def line_nums
   begin
      l = gets.strip!
   end while l.empty?

   l.to_i
end

def create_print_case
   i = 1 
   lambda {
      puts "Case #{i}" 
      i += 1
   }
end


if __FILE__ == $0
   display = Display.new
   f = create_print_case
   loop do
      lines = line_nums
      break if lines.zero?

      lines.times do
         process_line display, gets
      end

      display.print_display
      display.reset

      f.call
   end
end

in.txt

7
This is bad^h^c
^05^^
^14/ \^d^b   /   \
^u^d^d^l^l^l^l^l^l^l^l^l
^r^r< ACM >^l^l^d/^b   \
^b^d    \ /
^d^l^lv
7
^i9^l8^l7^l6^l5^l4^l3^l2^l1^l0
^o^d^lThis is #1^d^bThis is #2
^d^bThis is #3^d^bThis is #4
^d^bThis is #5^d^bThis is #6
^d^bThis is #7^d^bThis is #8
^i^d^bThis is #9^d^bThis is #10
^54^e Hello^d^l^l^l^lWorld
0