/*
	File Name        : valsdec.c
	Student Name     : Jason Gradziel
	Student Number   : 826-135-535
	Course Number    : ISYS 291
	Professor's Name : Brian Perry
	Lab Title        : Assignment #1

	Discription  	 :
		int valsdec (char* decstr, int whole decs);

		decstr - is the string to be validated.
		whole  - is the maximum number of digits before the
			decimal point.
		decs   - is the maximum number of digits after the
			decimal point.
	*/

#include <string.h>

int valunum (char* num);
int valsnum (char* s);

int valsdec(char* decstr, int whole, int decs)
{
	char whole_num[41] = {'\0'};
	char dec_num[41] = {'\0'};
	int return_num = 0;
	int sign = 0;
	int count = 0;
	int flag=0;
	int num = 0;
	int whole_val = 0;
	int decs_val = 0;


	/* to check for null */
	if (decstr[0] == '\0')
	{
		return_num = 11;
		strcpy(&decstr, NULL);
		return return_num;
	}

	/* to check if signed */
	/* zero if not signed, one if signed */
	if ((decstr[sign] == '+') || (decstr[sign] == '-')) sign++;

	if (sign == 0) /* not signed */
	{
		/* loop for length of string */
		for (count=0; count<strlen(decstr); count++)
		{
			/* to check for decimal */
			if (decstr[count] == '.')
				flag=1;
			/* to count whole number digits */
			else if (flag==0)
				whole_num[count] = decstr[count];
			/* to count decimal digits */
			else
			{
				dec_num[num] = decstr[count];
				num++;
			}
		}

		/* check if parameter whole is zero */
		if (whole == 0)
		{
			/* check for decimal place */
			if (decstr[sign]!= '.')
			{
				return_num = 11;
				return return_num;
			}
		}

		/* check if parameter decs is zero */
		if (decs == 0)
		{
			return_num = valunum(dec_num);
			if (return_num != 0)
				return return_num;
		}

		/* check digit after decimal */
		if (strlen(dec_num) == 0 && flag == 1)
		{
			return_num = 11;
			return return_num;
		}
	}
	else /* signed */
	{
		for (count=1; count<strlen(decstr); count++)
		{
			/* check for decimal */
			if (decstr[count] == '.')
				flag=1;
			/* to store whole digits */
			else if (flag==0)
				whole_num[count-1] = decstr[count];
			else
			/* to store decimal digits */
			{
				dec_num[num] = decstr[count];
				num++;
			}
		}

		/* to check for whole digits */
		if (whole == 0)
		{
			if (decstr[sign]!= '.')
			{
				return_num = 11;
				return return_num;
			}
		}

		/* to check for decimal digits */
		if (decs == 0)
		{
			return_num = valunum(dec_num);
			if (return_num != 0)
				return return_num;
		}

		/* check digit after decimal */
		if (strlen(dec_num) == 0 && flag == 1)
		{
			return_num = 11;
			return return_num;
		}
	}

	return_num = valunum(whole_num);
	if (return_num != 0)
		return return_num;
	return_num = valunum(dec_num);
	if (return_num != 0)
		return return_num;
	else
		{
		whole_val = strlen(whole_num);
		decs_val = strlen(dec_num);
		}

	/* check whole number */
	if (whole < whole_val)
		return_num = 11;
	/* check decimal number */
	if (decs < decs_val)
		return_num = 11;

	return return_num;

}