Implementation of to_unsignedInteger()

src/CustomerProperties.h

@@ -1,14 +0,0 @@
-typedef struct Customer{
-<<<<<<< HEAD
-<<<<<<< HEAD
-	int ID;
-	char *forename,*surname,*password;
-=======
-	char *ID, *forename, *surname, *password;
->>>>>>> 3e7a7d3 (Implementation of functions LoginAsCustomer() and Login())
-=======
-	int ID;
-	char *forename,*surname,*password;
->>>>>>> 4d810f5640d89a86c1f2feef3ab19118518ad49f
-	float balance;
-}customer_t;

src/LoginCustomer.c

@@ -1,97 +0,0 @@
-#include "LoginCustomer.h"
-
-bool checkLogin(bool loginSuccessful)
-{	
-	return (loginSuccessful) ? true : false;
-}
-
-void collectCustomerDataForLogin(int attempts)
-{
-	customer_t c;
-	c.ID = calloc(15+1,sizeof(char));
-	c.password = calloc(15+1, sizeof(char));
-	char digitCharacterFromUser, passwordCharacterFromUser;
-	int IDLengthCounter = 0, passwordLengthCounter = 0;
-	const int IDMaxLength = 16, passwordMaxLength = 16;
-	
-	printf("Enter ID:\n");
-	while(((digitCharacterFromUser=getchar()) != '\n')&&IDLengthCounter<IDMaxLength){
-			if(digitCharacterFromUser>='0'&&digitCharacterFromUser<='9'){
-				*(c.ID+IDLengthCounter) = digitCharacterFromUser;
-			}
-			else{
-				printf("Character entered is not a digit. Aborting.\n");
-				exit(-1);
-			}
-		++IDLengthCounter;	
-	}
-	*(c.ID+IDLengthCounter) = '\0';
-	
-	if(IDLengthCounter>=IDMaxLength){
-		printf("ID entered is too long. Aborting.\n");
-		exit(-1);
-	}
-
-	printf("Enter password:\n");
-	while((passwordCharacterFromUser=getchar())!='\n'&&passwordLengthCounter<passwordMaxLength){
-		*(c.password+passwordLengthCounter) = passwordCharacterFromUser;
-		++passwordLengthCounter;
-	}
-	*(c.password+passwordLengthCounter) = '\0';
-	
-	if(passwordLengthCounter>=passwordMaxLength){
-		printf("Password entered is too long. Aborting.\n");
-		exit(-1);
-	}
-	customer_t *ptr = &c;
-	bool loginSuccessful = loginCustomer(ptr);
-	if(loginSuccessful ) {
-		printf("Welcome to the menu!\n");
-		//call menu()
-	}else if(!loginSuccessful && attempts < MAX_LOGIN_ATTEMPTS){
-		printf("You have %d attempts left.\n", MAX_LOGIN_ATTEMPTS - attempts);
-		collectCustomerDataForLogin(++attempts);
-	}else{
-		printf("Maximum number of attempts reached. Program terminates.\n");
-		exit(-1);
-		//call error()
-	}
-	
-}
-
-bool loginCustomer(customer_t *c)
-{
-	bool foundCustomerEntryInFile = false;
-	char *searchForThisString = generateCheckString(c->ID,c->password);
-	char *lineFromCustomerFile = calloc(40,sizeof(char));
-	FILE *readCustomerFile = fopen("CustomerData.txt", "r");
-	if(readCustomerFile==NULL){
-		printf("Could not find file. Aborting.\n");
-		exit(-1);
-		//call error()
-	}
-	while((fscanf(readCustomerFile,"%s",lineFromCustomerFile)!=EOF)){
-			if(strcmp(searchForThisString,lineFromCustomerFile)==0){
-				foundCustomerEntryInFile = true;
-				break;
-			}
-	}
-	
-	if(checkLogin(foundCustomerEntryInFile)){
-		printf("Login successful.\n");
-		return foundCustomerEntryInFile;
-	}else{
-		printf("Login not successful.\n");
-	}
-	fclose(readCustomerFile);
-	return foundCustomerEntryInFile;
-}
-
-char *generateCheckString(char *ID, char *password){
-	int checkStringLength = strlen(ID) + 1 + strlen(password) + 1;
-	char *checkString = calloc(checkStringLength, sizeof(char));
-	checkString = strcat(ID,"=");
-	checkString = strcat(checkString,password);
-	*(checkString+checkStringLength) = '\0';
-	return checkString;
-}

src/LoginCustomer.h

@@ -1,10 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdbool.h>
-#include <string.h>
-#include "CustomerProperties.h"
-#define MAX_LOGIN_ATTEMPTS 3
-char *generateCheckString(char *, char*);
-bool checkLogin(bool);
-void collectCustomerDataForLogin(int);
-bool loginCustomer(customer_t *);

src/stringManipulation.c

@@ -54,6 +54,17 @@ char *to_string(int number)
 	}
 }
 
+unsigned int to_unsignedInteger(char *ID)
+{
+	unsigned int result = 0;
+	int IDLength = strlen(ID);
+	for(int i=0, j = IDLength - 1;i<IDLength;++i,--j){
+		result += (*(ID+j) - '0') * pow(10,i);
+	}
+	return result;
+}
+
+
 char *generateCheckString(int customerID, char *customerPassword)
 {
 	char *IDString = to_string(customerID);

src/stringManipulation.h

@@ -1,6 +1,8 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <math.h>
 char *stringConcatenation(char *, char *);
 char *to_string(int);
 char *generateCheckString(int, char *);
+unsigned int to_unsignedInteger(char *);