CVS Database (add,edit,delete,list all,list) program

#define action argv[1] // Just for making it easy to read :)
#define ID argv[2]
#define NAME argv[3]
#define AGE argv[4]

#define db_file "db.dat"
#define db_backup "db.backup"

#include <stdio.h>
#include <stdlib.h> //using atoi to convert strings to numbers
#include <string.h>

/*FUNCTION PROTOTYPES*/
int add(char *id,char *name,char *age);
int delete(int selected_line);
int edit(int selected_line,char *id,char *name,char *age);
int list(int line_number);
int listall();
int reset();
void help();


char ch;                    // temp variable for reading
int current_line;           // counter for storing the current line
int selected_line;          // stores the number of line to be edited or deleted, used by edit() and delete() functions



char flag_edited_line =0;   // used in edit() function to prevent multiple printing, senses if the line is written before
int i;                      // used in the for loops :)


FILE *fp1,*fp2;
int main(int argc,char *argv[])
{

    // this code makes sure there won't be error while reading from non existing file


    if(!(action == NULL)) // Check if there's an action
    {
        if (( fp1=fopen(db_file,"r") )== NULL) //error opening the file , not exists
        {
            fp1 = fopen(db_file,"w");
            fclose(fp1);
        }
        else
        {
            fclose(fp1);
        }



        // Adding new entry
        if (!strcmp(action,"-a") || !strcmp(action,"--add"))
        {
            // checking the data
            if (argc == 5)
            {
                add(ID,NAME,AGE);
            }
            else
            {
                printf("ERROR: MISSING DATA. CAN'T ADD ENTRY.\nDATA REQUIRED: 'islam --add ID NAME AGE'\n");
            }
        }


        // Deleting existing entry
        else if (!strcmp(action,"-d") || !strcmp(action,"--delete"))
        {
                if(argc == 3)
                {

                    // converting string to integer usint atoi
                    selected_line = atoi(ID);

                    // confirm deletion
                    printf("DO YOU REALLY WANT TO DELETE THIS ENTRY? [Y/N]\n");
                    if (getchar() == 'Y')
                    {
                        // deletion confirmed
                        if (!delete(selected_line))
                        printf("DELETED SUCESSFULLY\n");
                        else
                        printf("SOMETHING IS WRONG. DELETION CANCELED\n");
                    }


                }
                else
            {
                printf("ERROR: MISSING DATA. CAN'T ADD ENTRY.\nDATA REQUIRED: 'islam --delete NUMBER_OF_LINE'\n");
            }
        }


        //list all entries
        else if (!strcmp(action,"-la") || !strcmp(action,"--listall"))
        {
            listall();
        }


        // Listing specific entry
        else if (!strcmp(action,"-l") || !strcmp(action,"--list"))
        {
            if(argc == 3)
            {
                selected_line = atoi(ID);
                list(selected_line);
            }
            else
            {
                printf("ERROR: MISSING DATA. CAN'T ADD ENTRY.\nDATA REQUIRED: 'islam --list NUMBER_OF_LINE'\n");
            }
        }


        // Listing all entries
        else if (!strcmp(action,"-h") || !strcmp(action,"--help"))
        {
            help();
        }

        // Edit specific entry
        else if (!strcmp(action,"-e") || !strcmp(action,"--edit"))
        {
            if(argc == 6)
                {

                    // converting string to integer usint atoi
                    selected_line = atoi(argv[2]);

                    if (!edit(selected_line,argv[3],argv[4],argv[5]))
                        printf("EDITED SUCESSFULLY\n");
                    else
                        printf("SOMETHING IS WRONG. EDIT IS CANCELED\n");
                }
                else
            {
                printf("ERROR: MISSING DATA. CAN'T ADD ENTRY.\nDATA REQUIRED: 'islam --edit NUMBER_OF_LINE ID NAME AGE'\n");
            }
        }




        // RESET for the data :)
        else if (!strcmp(action,"-r") || !strcmp(action,"--reset"))
        {
            reset();
        }




        // Not valid action
        else
        {
            printf("islam: WRONG ACTION \nTRY 'islam --help' FOR MORE INFORATION.\n");
        }


    }
    else // Missing action
    {
        printf("islam: MISSING ACTION \nTRY 'islam --help' FOR MORE INFORATION.\n");
        help();
    }
    return 0;
}


/*Functions*/
int add(char *id,char *name,char *age) //inputs are 3 strings from argv[]
{
                // checking and opening the file
                fp1 = fopen(db_file,"a+");
                if(fp1 == NULL)
                {
                            printf("ERROR: PROBLEM OPENING THE FILE!\n");
                            return 0; //error
                }

                //Printing the line in the file
                fprintf(fp1,"%s,%s,%s\n",id,name,age);

                // Sucess Print
                printf("YOU'VE ADDED ENTRY SUCESSFULLY:\n%s,%s,%s\n",id,name,age);

                fclose(fp1);

    return 0;
}


/*********************************************************************************************************/

int delete(int selected_line)
{
        fp1 = fopen(db_file,"r");
        fp2 = fopen(db_backup,"w");

        current_line=1;

        if(fp1==NULL || fp2==NULL) // don't run if one of the files didn't open
        {
            printf("ERROR: PROBLEM OPENING THE FILE!\n");//error
        }

        while((ch=getc(fp1))!=EOF)
        {
            // this will increment the current line counter every time it detects \n
            if(ch=='\n')
                current_line++;

            // if not the deleted line keep copying :)
            if(current_line != (selected_line))
            {
                putc(ch,fp2);
            }
        }

        //closing files
        if(fclose(fp2)==EOF)
            printf("ERROR CLOSING fp2\n");
        if(fclose(fp1)==EOF)
            printf("ERROR CLOSING fp1\n");

        // removing the old file and rename the new file

        if (remove(db_file)==0)//check if file removed, remove returns 0 if everything went well
        {
            rename(db_backup,db_file);
        }

        printf("DONE ADDING\n");

        return 0;

}

/*********************************************************************************************************/

int edit(int selected_line,char *id,char *name,char *age)
{
        fp1 = fopen(db_file,"r");
        fp2 = fopen(db_backup,"w");
        current_line=1;
        flag_edited_line =0; // intaially sets the flag to false every time the function runs :)

        if(fp1==NULL || fp2==NULL) // don't run if one of the files didn't open
        {
            printf("ERROR: PROBLEM OPENING THE FILE!\n");//error
        }


        while((ch=getc(fp1))!=EOF)
        {
            // if not the deleted line keep copying :)
            if(current_line != (selected_line))
            {
                putc(ch,fp2);
            }
            else
            {
                if(flag_edited_line == 0)
                {
                        fprintf(fp2, "%s,%s,%s\n", id,name,age);
                }

                flag_edited_line = 1; //sets the flag true to
            }


            // this will increment the current line counter every time it detects \n
            if(ch=='\n')
                current_line++;
        }

        //closing files
        fclose(fp2);
        fclose(fp1);

        // removing the old file and rename the new file
        int ret = remove(db_file); //check if file removed, remove returns 0 if everything went well
        if (ret==0)
        {
            rename(db_backup,db_file);
        }

        printf("DONE EDITING\n");
        return 0;

}

/*********************************************************************************************************/


int listall()
{
    fp1 = fopen(db_file,"r");
    printf("-----------------------------\nLine No. :: ID ,  Name , Age\n-----------------------------\n");

    current_line=1;
    printf("1 :: ");
    while((ch=getc(fp1))!=EOF)
    {
                printf("%c",ch);
                if(ch=='\n')
                {
                    current_line++;
                    printf("%d :: ",current_line);
                }
    }
            if(current_line==1)
                printf("----- NO DATA FOUND :/ -----\n");

            printf("\r-----------------------------\n"); // \r tricky :D
    return 0;
}


int list(int line_number)
{
    if(line_number==0)
    {
        printf("Enter a valid number\n");
    }
    else
    {
            fp1 = fopen(db_file,"r");
            current_line=1;

            printf("Entry Details: ID, Name, Age\n");
            while((ch=getc(fp1))!=EOF)
            {


                // if it's the selected line print it :)
                if(current_line == (selected_line))
                {
                    printf("%c",ch);
                }

                // this will increment the current line counter every time it detects \n
                if(ch=='\n')
                    current_line++;
            }
            fclose(fp1);
    }

    return 0;
}

/*********************************************************************************************************/


int reset()
{
    printf("ARE YOU SURE YOU WANT TO ERASE ALL THE DATA [Y/n]?\n");
    ch = getchar();
    if(ch=='Y')
    {
        remove(db_file);
        fp1 = fopen(db_file,"w");
        fclose(fp1);
    }
    return 0;
}

void help()
{
    printf("#######################################################\n#######################################################\nWelcome to isdb : Islam Database Program Version 0.1\nThe program is just for test,\n feel free to contact me on [email protected]\nIt's really easy to use this program, You've 6 main commands (add , edit , delete , list , reset, help)\n1- ADD ENTRY:\n\tSyntax: ./isdb -a [--add] ID NAME AGE \n2- DELETE ENTRY *Require confirmation :\n\tSyntax: ./isdb -d [--delete] NUMBER_OF_LINE \n3- EDIT ENTRY :\n\tSyntax: ./isdb -e [--edit] NUM_OF_LINE ID NAME AGE \n4- LIST SPECIFIC ENTRY :\n\tSyntax: ./isdb -l [--list] NUM_OF_LINE\n5- LIST ALL ENTRIES:\n\tSyntax: ./isdb -la [--listall]\n6- RESET DATABASE (REMOVE ALL ENTRIES) *Require confirmation:\n\tSyntax: ./isdb -r [--reset]\n7- SHOW HELP:\n\tSyntax: ./isdb -h [--help]\n#######################################################\n#######################################################\n");
}