/*****************************************************************************\
 * Exercise 8-1: a program that prints a grid from user-entered dimensions
 *
 * Author: Suzi Anvin
 *
 * Purpose: practice using for statements in C
\*****************************************************************************/

#include <stdio.h>

void draw_dash_plus_line (int width)
{
  int i;			/* counters */
  int j;
  /* setting up loops to draw a grid of the specified width.  */
  for (i = 0; i < width; i++) {
    /* print height + 1 vertical lines that are width long */
    putchar('+');		
    for (j = 0; j < 5; j++) {
      putchar('-');
    }
  }
  putchar('+');
  putchar('\n');
}

void draw_pipe_space_lines (int width)
{
  int i;			/* counters */
  int j;
  int k;
  for (i = 0; i < 3; i++) {
    for (j = 0; j < width; j++) {
      putchar('|');
      for (k = 0; k < 5; k++) {
	putchar(' ');
      }
    }
    putchar('|');
    putchar('\n');
  }
}

int main()
{
  char line[50];
  int width = 0;		/* user selected width of grid */
  int height = 0;		/* heigth of grid */
  int i;			/* counter */

  /* getting user dimensions for grid */
  for (;;) {
    printf("Enter the size of desired grid A x B : ");
    fgets(line, sizeof(line), stdin);
    sscanf(line, "%d %*[^-0-9] %d", &width, &height);
    /* limiting grid size */
    if (width > 12 || width <= 0 || height > 12 || height <= 0 ) { 
      printf("Please enter positive values of 12 or smaller.\n");
      continue;			/* re-input dimensions */
    }
    /* setting up the loop to draw a grid of the specified height, 
     * avoiding the fencepost error by using height + 1 */
    for (i = 0; i < height; i++) {
      draw_dash_plus_line (width);
      draw_pipe_space_lines (width);
    }
    draw_dash_plus_line (width);
    printf("Would you like to print another grid? (y/n): ");
    fgets(line, sizeof(line), stdin);
    if (line[0] == 'y')
      continue;
    else
      break;
  }
  return (0);
}