sort struct from file help!

[xxxrugby]

Need help.
I read all about qsort, and tried qsort and lots of my ideas but I just can't get alphabet order.
Maybe I need to make some changes in program, or linked struct or something. open for all ideas. This program works me at home.

Can you help me in finishing function -- void list_records(FILE*);
-- case '2'.
Sorting struct from file in alphabet order. Does not need to be in the same file. No problem for creating another file or something.

in advance:
Thank's for your time and help.

#include <stdio.h>
#include <string.h>

 struct book {
       char name[30];
       char publisher[30];
       int year;
}data;

void add_records(FILE*);
void list_records(FILE*);
void modify_records(FILE*);

int main()
{
 FILE *t, *p;  int choice; int choice_search; char booknames[30];

 if((t = fopen("BOOK.DAT","rb+"))==NULL)
 {
       if((t = fopen("BOOK.DAT","wb+"))==NULL)
       {
             printf("The File can't be open\n");
             exit(1);
       }
 }

 system("cls");

 printf("                  BOOK DIRECTORY                      \n");
 printf("          ******************************              \n");

 printf("1 - Add Records\n"
        "2 - List Records\n"
        "3 - Modify Records\n"
        "4 - Delite Records\n"
        "0 - Exit\n"
        "Your Chice:\n");
 fflush(stdin);
 choice = getche();

 switch(choice)
 {
    case '1': add_records(t); break;
    case '2': list_records(t); break;
    case '3': modify_records(t); break;
    case '4':
        printf("\nEnter name of book to delete:\n");
	    scanf("%s", booknames);
        p = fopen("TEMP.DAT","wb");
        rewind(t);
        while(fread( &data, sizeof(data), 1, t) ==1 )
	    {
	        if(strcmp(data.name,booknames)!=0)
            fwrite( &data, recsize, 1, p);
	    }
        fclose(t); fclose(p);
        remove("BOOK.DAT"); rename("TEMP.DAT","BOOK.DAT");

         main();
     break;
    case '0': printf("\n"); fclose(t); exit(1);
 }

 fclose(t);
 printf("\n\nError! Unknown Choice!\n\n");
 main();
 return 0;
}

void add_records(FILE*t)
{
 char another;
 fseek(t, 0, SEEK_END);
 another = 'y';
 while(another == 'y')
 {
    printf("\nEnter Book name, Publisher and Year of publishing\n");
    gets(data.name); gets(data.publisher); scanf("%d",&data.year);
    fwrite(&data, sizeof(data),1,t);

    printf("Add another data (y/n):");
    fflush(stdin);
    another = getche();
    printf("\n");
 } fclose(t);
 printf("\n");
 main();
}

void list_records(FILE*t)
{
 int listc;  int i; int n = 0;
 rewind(t);
 printf("\nListanje po:\n"
        "1 - Time Record\n"
        "2 - Alphabet order\n");
 fflush(stdin);
 listc = getche();
 switch(listc)
 {
    case '1':
        printf("\n");
        printf("---------------------------------------------------------------------\n");
        printf("|           BOOK               |          PUBLISHER           | YEAR |\n");
        printf("---------------------------------------------------------------------\n");
        rewind(t);
        while(fread( &data, sizeof(data), 1, t) == 1)
            printf("|%-30s|%-30s| %6d|\n", &data.name,&data.publisher,data.year);
        printf("------------------------------------------------------------------\n");
        system("PAUSE");
        printf("\n"); break;
    case '2':
        printf("\nNot finished at this moment\n"); break;
 } fclose(t); printf("\n");
 main();
}

void modify_records(FILE *t)
{
 char another = 'y'; char bookname[30];
 while(another == 'y')
 {
    printf("\nEnter book name to modify:");
    gets(bookname);
    rewind(t);
    while(fread( &data, sizeof(data), 1, t ) == 1)
    {
        if(strcmp(data.name, bookname) == 0)
        {
            printf("\nEnter new name, publisher and year of publishing\n");
            gets(data.name); gets(data.publisher); scanf("%d", &data.year);

            fseek(t, -sizeof(data), SEEK_CUR);
            fwrite(&data, recsize, 1, t);
            break;
        }
    }
    printf("Modify another record (y/n):");
        fflush(stdin);
        another = getche();
    printf("\n");
 } fclose(t); printf("\n");
 main();
}

[Kleid-0]

Thank you :)

[Kleid-0]

Do not use fflush(stdin);
This is Why
This is what you use other than fflush(stdin);

Do not use getche(); it's not standard (lol; but seriously..)
Evidence here
Use getchar() instead of getche();

Change int main() to int main(void)
This is Why

And about your main problem, I'm going to need a little more time lol :P I like your code by the way!

[Sebastiani]

>> I read all about qsort, and tried qsort and lots of my ideas but I just can't get alphabet order.

since you don't have any code posted for the sorting routine it's hard to say why it doesn't work.

>> Maybe I need to make some changes in program, or linked struct or something.

sounds like a good idea, that's how it's usually done - data is maintained in memory and flushed to file when changes are made.

>> gets(data.name); gets(data.publisher); scanf("%d",&data.year);

mixing gets with scanf is a bad idea (and gets is unsafe besides) - read the FAQ for more on all of that.

// fflush(stdin)

that results in undefined behaviour. also in the FAQ.

[Hammer]

There are a few problems with your code you need to fix before worrying about sorting the data in alphabetical order.

- main() - don't call this within your code, leave that to the invoking operating system. When a function ends, control will return to the calling function, so you definately don't want to be calling a function at the ****_records() functions (like you currently are with main)

fflush(stdin) is wrong. Read the FAQ:
http://faq.cprogramming.com/cgi-bin/...&id=1043284351

gets() is a function to avoid, read this FAQ:
http://faq.cprogramming.com/cgi-bin/...&id=1043284351

Now, in order to sort the data, you're going to need it all in memory. I'd suggest reading up on some list techniques, maybe this will help:
http://faq.cprogramming.com/cgi-bin/...ect=1073086407

[edit]
I see I'm beaten, oh well!