functions.c

/*-----------------------------------------------------------------------------+ 
File Name: functions.c
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
   Programming III COP4338
   Author: Daniel Gonzalez P#4926400
   assignment 5: Date Validate / Format 
   Date: 11/08/2016 ELLECTION DAY!!!!

  program description
     Input: Accept input for the first program via the command-line arguments. 
            Input will be the number of valid entries to be redirected from 
            the dates input file (dates.dat). A zero indicates to input all
            entries from the dates input file. Your program should validate
            (day, month & year - see page 111 for validation ideas) and skip 
            corrupt dates in the dates.dat file (see page 159 for scanning 
            ideas). This validated input will then be piped out to the 
            second program. 
            The second program will accept these validated dates in the 
            month/day/year format and convert each of them to the day, 
            abbreviated month & year format — both exhibited above. The 
            abbreviated month should consist of the first three letters of 
            the month, capitalized. These converted results will be redirected 
            to the output file (output.dat), followed by a copy of the 
            original (dates.dat) data.

     Output: Generates an output file (output.dat) that contains a 
             converted list of dates in day, abbreviated month & year 
             format (i.e. 1 JAN 1900), followed by the original list of 
             dates in month/day/year format (i.e. 1/1/1900). This output file 
             will be the result of appending the input file (dates.dat), which
             is accessed by the first program, with the result output file 
             (output.dat), generated by the second program.


  +-------------------------------------------------------------------------+
  | I Daniel Gonzalez #4926400 hereby certify that this collective work is  |
  | my own and none of it is the work of any other person or entity.        |
  +-------------------------------------------------------------------------+
  

  how to compile and execute:
    1.Open the terminal
        Go to the program folder that contains all the files required for 
        the program to compile including all header files(*.h). 
        Run the following command "make"

    2.Open the terminal
        Go to the program folder that contains all the files required for 
        the program to compile including all header files(*.h). 
        COMPILE: "gcc -Wall -w -lm readDate.c functions.c -o validateDate"
        		 "gcc -Wall -w -lm format.c functions.c -o format"

    Program execution:
    From the terminal enter:
     “./validateDate < dates.dat [X] | ./format > output.dat"

     X: is the amount of validated dates 
    



+-----------------------------------------------------------------------------*/
#include "general.h"

/**----------------------------------------------------------------------------+
 * Adds line to a LineList structure
 * allocating more memory if necessary.
 * @param  lineList [The list of lines to append lines to.]
 * @param  line     [The line to be appended to the list]
 * @return          [TRUE if success otherwise FALSE]
 */
Boolean appendToLineList(LineList * lineList, const char *line){

	/* Initialize variables */
	int newCapacity = 0;
	newCapacity = lineList->capacity * 2;
	Line * temp = NULL;

	if (lineList->size == lineList->capacity){

		temp = (Line *) realloc(lineList->lines,
				sizeof(lineList->lines[0]) * newCapacity);

		if (temp != NULL){
			lineList->capacity = newCapacity;
			lineList->lines = temp;
		}else{
			return FALSE;
		}
	}else{
	}

	lineList->lines[lineList->size++].content[0] = '\0';
	strncat(lineList->lines[lineList->size++].content, line, MAX_LINE);
	return TRUE;

}



/**----------------------------------------------------------------------------+ 
 * Frees the allocated memory from a LineList.
 * @param lineList [lineList pointer to be deallocated]
 */
void freeLineList(LineList * lineList){

	free(lineList->lines);
	lineList->capacity = 0;
	lineList->size = 0;

}





/**----------------------------------------------------------------------------+
 * Initializes the DateKeys object and returns it
 * @param  line [line to be scanned for date]
 * @return      [dateKey object initialized if valid]
 */
DateKey getDateKeys(char * line){

	/* Initialize variables */
	DateKey tempDate;
	double day = 0.0;
	double month = 0.0;
	double year = 0.0;

	/* try to get three variales*/
	if (sscanf(line, "%lf/%lf/%lf", &month, &day, &year) != VALID_KEYS){
		tempDate.error = ERRORS_UNABLE_TO_READ;
		return tempDate;
	}else{
	}


	if (hasValidDateType(&tempDate, month, day, year)){
		tempDate.day = (int) day;
		tempDate.month = (int) month;
		tempDate.year = (int) year;
	}else{
		return tempDate;
	}

	if(isValidDate(&tempDate)){
		tempDate.error = NO_ERRORS;
	}

	return tempDate;
}


/**----------------------------------------------------------------------------+
 * Checks if the values for the Date are valid
 * @param  date  [date to check]
 * @param  month [month value]
 * @param  day   [day value]
 * @param  year  [year value]
 * @return       [true if valid otherwise is false]
 */
Boolean hasValidDateType(
							DateKey * date, 
							double month,
							double day, 
							double year
						){

	if ((fmod(day, 1.0) != 0.0) ||
		(fmod(month, 1.0) != 0.0) ||
		(fmod(year, 1.0) != 0.0)){

		date->error = ERRORS_DECIMALS_IN_DATE;
		return FALSE;

	}else{
	}

	if ((day < INT_MIN || day > INT_MAX) ||
		(month < INT_MIN || month > INT_MAX) ||
		(year < INT_MIN || year > INT_MAX)){

		date->error = ERRORS_HUGE_DATE;
		return FALSE;

	}else{
	}

	date->error = NO_ERRORS;
	return TRUE;

}



/**----------------------------------------------------------------------------+
 * Allocates memory for a line list to hold all 
 * the values from the input stream
 * @param lineList [pointer to be initialized]
 */
void initializeLineList(LineList * lineList){

	lineList->capacity = MIN_FILE_LINES;
	lineList->lines = (Line *) malloc(sizeof(lineList->lines[0]) *
						   lineList->capacity);
	lineList->size = 0;
}


/**----------------------------------------------------------------------------+
 * [Determines if it is a leap year]
 * @param  year [year value]
 * @return      [returns true if leap year otherwise false]
 */
Boolean isLeapYear(int year){

		return ((year % LEAP_YEAR) == 0)? TRUE : FALSE;	
}



/**----------------------------------------------------------------------------+
 * Check is the Date has valid values for the date
 * @param  date [date to be checked]
 * @return      [returns true if valid date otherwise false]
 */
Boolean isValidDate(DateKey * date){

	int monthDays [] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

	if(isLeapYear(date->year)){
		monthDays[1] = 29;
	}else{
	}

	if (date->month < 1 || date->month > 12){
		date->error  = ERRORS_INVALID_MONTH;
		return FALSE;
	}else{
	}

	if (date->day < 1 || date->day > monthDays[date->month - 1]){
		date->error = ERRORS_INVALID_DAY;
		return FALSE;
	}else{
	}

	return TRUE;
}



/**----------------------------------------------------------------------------+
 * pProcedure to print an error if the date could not be read or parsed
 * @param stErr [the string to put the error]
 * @param line  [line with the error]
 * @param error [error number]
 */
void printError(char * stErr, char * line, Error error){

	strcpy(stErr, ERROR_DESCRIPTIONS[error]);
	strncat(stErr,":\t ",MAX_LINE);
	strncat(stErr, line, MAX_LINE);
	fprintf(stderr,"%s", stErr);

}


/**----------------------------------------------------------------------------+
 * [Prints a date in a specific format]
 * @param strIn  [Buffer to fill with the output.]
 * @param format [The format to use when printing.]
 * @param date   [Date with all the values]
 */
void printfDate(char * strIn, Format format, DateKey * date){

	char monthName [MAX_MONTH_NAME];

	strcpy(monthName, MONTH_NAMES_SHORT[date->month]);

	if (format == DATE_FORMAT_SHORT_MONTH){

		snprintf(strIn, MAX_LINE, "%2d %s %5d\n",
		 			date->day, monthName, date->year);

	}else {

		snprintf(strIn, MAX_LINE, "%d/%d/%d\n",
					date->month, date->day, date->year);

	}
}