Library project in c | In simple language

{

#include <stdio.h>
#include <time.h>
#include <string.h>
#define MAX_YR 9999
#define MIN_YR 1900
#define MAX_SIZE_USER_NAME 30
#define MAX_SIZE_PASSWORD 20
#define FILE_NAME "AticleworldLibBookS.bin"
// Macro related to the books info
#define MAX_BOOK_NAME 50
#define MAX_AUTHOR_NAME 50
#define MAX_STUDENT_NAME 50
#define MAX_STUDENT_ADDRESS 300
#define FILE_HEADER_SIZE sizeof(sFileHeader)
// structure to store date
typedef struct
{
    int yyyy;
    int mm;
    int dd;
} Date;
typedef struct
{
    char username[MAX_SIZE_USER_NAME];
    char password[MAX_SIZE_PASSWORD];
} sFileHeader;
typedef struct // to call in program
{
    unsigned int books_id;                 // declare the integer data type
    char bookName[MAX_BOOK_NAME];          // declare the character data type
    char authorName[MAX_AUTHOR_NAME];      // declare the charecter data type
    char studentName[MAX_STUDENT_NAME];    // declare the character data type
    char studentAddr[MAX_STUDENT_ADDRESS]; // declare the character data type
    Date bookIssueDate;                    // declare the integer data type
} s_BooksInfo;
void printMessageCenter(const char *message)
{
    int len = 0;
    int pos = 0;
    // calculate how many space need to print
    len = (78 - strlen(message)) / 2;
    printf("\t\t\t");
    for (pos = 0; pos < len; pos++)
    {
        // print space
        printf(" ");
    }
    // print message
    printf("%s", message);
}
void headMessage(const char *message)
{
    system("cls");
    printf("\t\t\t###########################################################################");
    printf("\n\t\t\t############                                                   ############");
    printf("\n\t\t\t############      Library management System Project in C       ############");
    printf("\n\t\t\t############                                                   ############");
    printf("\n\t\t\t###########################################################################");
    printf("\n\t\t\t---------------------------------------------------------------------------\n");
    printMessageCenter(message);
    printf("\n\t\t\t----------------------------------------------------------------------------");
}
void welcomeMessage()
{
    headMessage("gulshan himanshu kuldeep");
    printf("\n\n\n\n\n");
    printf("\n\t\t\t  **-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**\n");
    printf("\n\t\t\t        =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=");
    printf("\n\t\t\t        =                 WELCOME                   =");
    printf("\n\t\t\t        =                   TO                      =");
    printf("\n\t\t\t        =                 LIBRARY                   =");
    printf("\n\t\t\t        =               MANAGEMENT                  =");
    printf("\n\t\t\t        =                 SYSTEM                    =");
    printf("\n\t\t\t        =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=");
    printf("\n\t\t\t  **-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**\n");
    printf("\n\n\n\t\t\t Enter any key to continue.....");
    getch();
}
int isNameValid(const char *name)
{
    int validName = 1;
    int len = 0;
    int index = 0;
    len = strlen(name);
    for (index = 0; index < len; ++index)
    {
        if (!(isalpha(name[index])) && (name[index] != '\n') && (name[index] != ' '))
        {
            validName = 0;
            break;
        }
    }
    return validName;
}
// Function to check leap year.
// Function returns 1 if leap year
int IsLeapYear(int year)
{
    return (((year % 4 == 0) &&
             (year % 100 != 0)) ||
            (year % 400 == 0));
}
// returns 1 if given date is valid.
int isValidDate(Date *validDate)
{
    // check range of year,month and day
    if (validDate->yyyy > MAX_YR ||
        validDate->yyyy < MIN_YR)
        return 0;
    if (validDate->mm < 1 || validDate->mm > 12)
        return 0;
    if (validDate->dd < 1 || validDate->dd > 31)
        return 0;
    // Handle feb days in leap year
    if (validDate->mm == 2)
    {
        if (IsLeapYear(validDate->yyyy))
            return (validDate->dd <= 29);
        else
            return (validDate->dd <= 28);
    }
    // handle months which has only 30 days
    if (validDate->mm == 4 || validDate->mm == 6 ||
        validDate->mm == 9 || validDate->mm == 11)
        return (validDate->dd <= 30);
    return 1;
}
// Add books in list
void addBookInDataBase()
{
    int days;
    s_BooksInfo addBookInfoInDataBase = {0};
    FILE *fp = NULL;
    int status = 0;
    fp = fopen(FILE_NAME, "ab+");
    if (fp == NULL)
    {
        printf("File is not opened\n");
        exit(1);
    }
    headMessage("ADD NEW BOOKS");
    printf("\n\n\t\t\tENTER YOUR DETAILS BELOW:");
    printf("\n\t\t\t---------------------------------------------------------------------------\n");
    printf("\n\t\t\tBook ID NO  = ");
    fflush(stdin);
    scanf("%u", &addBookInfoInDataBase.books_id);
    do
    {
        printf("\n\t\t\tBook Name  = ");
        fflush(stdin);
        fgets(addBookInfoInDataBase.bookName, MAX_BOOK_NAME, stdin);
        status = isNameValid(addBookInfoInDataBase.bookName);
        if (!status)
        {
            printf("\n\t\t\tName contain invalid character. Please enter again.");
        }
    } while (!status);
    do
    {
        printf("\n\t\t\tAuthor Name  = ");
        fflush(stdin);
        fgets(addBookInfoInDataBase.authorName, MAX_AUTHOR_NAME, stdin);
        status = isNameValid(addBookInfoInDataBase.authorName);
        if (!status)
        {
            printf("\n\t\t\tName contain invalid character. Please enter again.");
        }
    } while (!status);
    do
    {
        printf("\n\t\t\tStudent Name  = ");
        fflush(stdin);
        fgets(addBookInfoInDataBase.studentName, MAX_STUDENT_NAME, stdin);
        status = isNameValid(addBookInfoInDataBase.studentName);
        if (!status)
        {
            printf("\n\t\t\tName contain invalid character. Please enter again.");
        }
    } while (!status);
    do
    {
        // get date year,month and day from user
        printf("\n\t\t\tEnter date in format (day/month/year): ");
        scanf("%d/%d/%d", &addBookInfoInDataBase.bookIssueDate.dd, &addBookInfoInDataBase.bookIssueDate.mm, &addBookInfoInDataBase.bookIssueDate.yyyy);
        // check date validity
        status = isValidDate(&addBookInfoInDataBase.bookIssueDate);
        if (!status)
        {
            printf("\n\t\t\tPlease enter a valid date.\n");
        }
    } while (!status);
    fwrite(&addBookInfoInDataBase, sizeof(addBookInfoInDataBase), 1, fp);
    fclose(fp);
}
// search books
void searchBooks()
{
    int found = 0;
    char bookName[MAX_BOOK_NAME] = {0};
    s_BooksInfo addBookInfoInDataBase = {0};
    FILE *fp = NULL;
    int status = 0;
    fp = fopen(FILE_NAME, "rb");
    if (fp == NULL)
    {
        printf("\n\t\t\tFile is not opened\n");
        exit(1);
    }
    headMessage("SEARCH BOOKS");
    // put the control on books detail
    if (fseek(fp, FILE_HEADER_SIZE, SEEK_SET) != 0)
    {
        fclose(fp);
        printf("\n\t\t\tFacing issue while reading file\n");
        exit(1);
    }
    printf("\n\n\t\t\tEnter Book Name to search:");
    fflush(stdin);
    fgets(bookName, MAX_BOOK_NAME, stdin);
    while (fread(&addBookInfoInDataBase, sizeof(addBookInfoInDataBase), 1, fp))
    {
        if (!strcmp(addBookInfoInDataBase.bookName, bookName))
        {
            found = 1;
            break;
        }
    }
    if (found)
    {
        printf("\n\t\t\tBook id = %u\n", addBookInfoInDataBase.books_id);
        printf("\t\t\tBook name = %s", addBookInfoInDataBase.bookName);
        printf("\t\t\tBook authorName = %s", addBookInfoInDataBase.authorName);
        printf("\t\t\tBook issue date(day/month/year) =  (%d/%d/%d)", addBookInfoInDataBase.bookIssueDate.dd,
               addBookInfoInDataBase.bookIssueDate.mm, addBookInfoInDataBase.bookIssueDate.yyyy);
    }
    else
    {
        printf("\n\t\t\tNo Record");
    }
    fclose(fp);
    printf("\n\n\n\t\t\tPress any key to go to main menu.....");
    getchar();
}
// v books function
void viewBooks()
{
    int found = 0;
    char bookName[MAX_BOOK_NAME] = {0};
    s_BooksInfo addBookInfoInDataBase = {0};
    FILE *fp = NULL;
    int status = 0;
    unsigned int countBook = 1;
    headMessage("VIEW BOOKS DETAILS");
    fp = fopen(FILE_NAME, "rb");
    if (fp == NULL)
    {
        printf("File is not opened\n");
        exit(1);
    }
    if (fseek(fp, FILE_HEADER_SIZE, SEEK_SET) != 0)
    {
        fclose(fp);
        printf("Facing issue while reading file\n");
        exit(1);
    }
    while (fread(&addBookInfoInDataBase, sizeof(addBookInfoInDataBase), 1, fp))
    {
        printf("\n\t\t\tBook Count = %d\n\n", countBook);
        printf("\t\t\tBook id = %u", addBookInfoInDataBase.books_id);
        printf("\n\t\t\tBook name = %s", addBookInfoInDataBase.bookName);
        printf("\t\t\tBook authorName = %s", addBookInfoInDataBase.authorName);
        printf("\t\t\tBook issue date(day/month/year) =  (%d/%d/%d)\n\n", addBookInfoInDataBase.bookIssueDate.dd,
               addBookInfoInDataBase.bookIssueDate.mm, addBookInfoInDataBase.bookIssueDate.yyyy);
        found = 1;
        ++countBook;
    }
    fclose(fp);
    if (!found)
    {
        printf("\n\t\t\tNo Record");
    }
    printf("\n\n\t\t\tPress any key to go to main menu.....");
    fflush(stdin);
    getchar();
}
// delete function
void deleteBooks()
{
    int found = 0;
    int bookDelete = 0;
    sFileHeader fileHeaderInfo = {0};
    char bookName[MAX_BOOK_NAME] = {0};
    s_BooksInfo addBookInfoInDataBase = {0};
    FILE *fp = NULL;
    FILE *tmpFp = NULL;
    int status = 0;
    headMessage("Delete Books Details");
    fp = fopen(FILE_NAME, "rb");
    if (fp == NULL)
    {
        printf("File is not opened\n");
        exit(1);
    }
    tmpFp = fopen("tmp.bin", "wb");
    if (tmpFp == NULL)
    {
        fclose(fp);
        printf("File is not opened\n");
        exit(1);
    }
    fread(&fileHeaderInfo, FILE_HEADER_SIZE, 1, fp);
    fwrite(&fileHeaderInfo, FILE_HEADER_SIZE, 1, tmpFp);
    printf("\n\t\t\tEnter Book ID NO. for delete:");
    scanf("%d", &bookDelete);
    while (fread(&addBookInfoInDataBase, sizeof(addBookInfoInDataBase), 1, fp))
    {
        if (addBookInfoInDataBase.books_id != bookDelete)
        {
            fwrite(&addBookInfoInDataBase, sizeof(addBookInfoInDataBase), 1, tmpFp);
        }
        else
        {
            found = 1;
        }
    }
    (found) ? printf("\n\t\t\tRecord deleted successfully.....") : printf("\n\t\t\tRecord not found");
    fclose(fp);
    fclose(tmpFp);
    remove(FILE_NAME);
    rename("tmp.bin", FILE_NAME);
}
void updateCredential(void)
{
    sFileHeader fileHeaderInfo = {0};
    FILE *fp = NULL;
    unsigned char userName[MAX_SIZE_USER_NAME] = {0};
    unsigned char password[MAX_SIZE_PASSWORD] = {0};
    headMessage("Update Credential");
    fp = fopen(FILE_NAME, "rb+");
    if (fp == NULL)
    {
        printf("File is not opened\n");
        exit(1);
    }
    fread(&fileHeaderInfo, FILE_HEADER_SIZE, 1, fp);
    if (fseek(fp, 0, SEEK_SET) != 0)
    {
        fclose(fp);
        printf("\n\t\t\tFacing issue while updating password\n");
        exit(1);
    }
    printf("\n\n\t\t\tNew Username:");
    fflush(stdin);
    fgets(userName, MAX_SIZE_USER_NAME, stdin);
    printf("\n\n\t\t\tNew Password:");
    fflush(stdin);
    fgets(password, MAX_SIZE_PASSWORD, stdin);
    strncpy(fileHeaderInfo.username, userName, sizeof(userName));
    strncpy(fileHeaderInfo.password, password, sizeof(password));
    fwrite(&fileHeaderInfo, FILE_HEADER_SIZE, 1, fp);
    fclose(fp);
    printf("\n\t\t\tYour Password has been changed successfully");
    printf("\n\t\t\ttLogin Again:");
    fflush(stdin);
    getchar();
    exit(1);
}
void menu()
{
    int choice = 0;
    do
    {
        headMessage("MAIN MENU");
        printf("\n\n\n\t\t\t1.Add Books");
        printf("\n\t\t\t2.Search Books");
        printf("\n\t\t\t3.View Books");
        printf("\n\t\t\t4.Delete Book");
        printf("\n\t\t\t5.Update Password");
        printf("\n\t\t\t0.Exit");
        printf("\n\n\n\t\t\tEnter choice => ");
        scanf("%d", &choice);
        switch (choice)
        {
        case 1:
            addBookInDataBase();
            break;
        case 2:
            searchBooks();
            break;
        case 3:
            viewBooks();
            break;
        case 4:
            deleteBooks();
            break;
        case 5:
            updateCredential();
            break;
        case 0:
            printf("\n\n\n\t\t\t\tThank you!!!\n\n\n\n\n");
            exit(1);
            break;
        default:
            printf("\n\n\n\t\t\tINVALID INPUT!!! Try again...");
        }                  // Switch Ended
    } while (choice != 0); // Loop Ended
}
// login password
void login()
{
    unsigned char userName[MAX_SIZE_USER_NAME] = {0};
    unsigned char password[MAX_SIZE_PASSWORD] = {0};
    int L = 0;
    sFileHeader fileHeaderInfo = {0};
    FILE *fp = NULL;
    headMessage("Login");
    fp = fopen(FILE_NAME, "rb");
    if (fp == NULL)
    {
        printf("File is not opened\n");
        exit(1);
    }
    fread(&fileHeaderInfo, FILE_HEADER_SIZE, 1, fp);
    fclose(fp);
    do
    {
        printf("\n\n\n\t\t\t\tUsername:");
        fgets(userName, MAX_SIZE_USER_NAME, stdin);
        printf("\n\t\t\t\tPassword:");
        fgets(password, MAX_SIZE_PASSWORD, stdin);
        if ((!strcmp(userName, fileHeaderInfo.username)) && (!strcmp(password, fileHeaderInfo.password)))
        {
            menu();
        }
        else
        {
            printf("\t\t\t\tLogin Failed Enter Again Username & Password\n\n");
            L++;
        }
    } while (L <= 3);
    if (L > 3)
    {
        headMessage("Login Failed");
        printf("\t\t\t\tSorry,Unknown User.");
        getch();
        system("cls");
    }
}
int isFileExists(const char *path)
{
    // Try to open file
    FILE *fp = fopen(path, "rb");
    int status = 0;
    // If file does not exists
    if (fp != NULL)
    {
        status = 1;
        // File exists hence close file
        fclose(fp);
    }
    return status;
}
void init()
{
    FILE *fp = NULL;
    int status = 0;
    const char defaultUsername[] = "aticleworld\n";
    const char defaultPassword[] = "aticleworld\n";
    sFileHeader fileHeaderInfo = {0};
    status = isFileExists(FILE_NAME);
    if (!status)
    {
        // create the binary file
        fp = fopen(FILE_NAME, "wb");
        if (fp != NULL)
        {
            // Copy default password
            strncpy(fileHeaderInfo.password, defaultPassword, sizeof(defaultPassword));
            strncpy(fileHeaderInfo.username, defaultUsername, sizeof(defaultUsername));
            fwrite(&fileHeaderInfo, FILE_HEADER_SIZE, 1, fp);
            fclose(fp);
        }
    }
}
int main()
{
    init();
    welcomeMessage();
    login();
    return 0;
}