void main ( )
{
clrscr();
void create ( );
void ftraverse ( );
void btraverse ( );
create ( );
btraverse ( );
ftraverse ( );
getch ( );
}
/* load and initialize db from file first menu option function */
void init_db(const char *file)
{
/* temp buffers and descriptors */
FILE *fd;
char given_id[11];
char line[256+56+56+4+40];
char book_name[256];
char writer[56*2];
char the_year[4];
char pub_name[40];
fd = fopen(file, "r");
if (!fd)
fatal("Is there a datafile?");
/* get the total number of books */
if (!fgets(line, 8, fd))
fatal("while reading datafile");
long n = atol(line);
if (!n)
fatal("no sum of books at the first line");
/* allocate the main database */
db.arr = smalloc(sizeof(Book)*n);
db.numberOfBooks = 0;
/* start parsing the file, delimiter is ';' */
memset(line, 0, sizeof(line));
printf("Loading file...\n");
while (fgets(line, sizeof(Book), fd) != NULL) {
/* erase the previous data */
memset(given_id, 0, sizeof(given_id));
memset(book_name, 0, sizeof(book_name));
memset(writer, 0, sizeof(writer));
memset(the_year, 0, sizeof(the_year));
memset(pub_name, 0, sizeof(pub_name));
/* scanf is like magic */
sscanf(line, "\"%[0-9]\";\"%[0-9a-zA-Z.:!'?,)( ]\";\"%[0-9a-zA-Z.:',!?)( ]\";\"%[0-9]\";\"%[0-9a-zA-Z.:'!,?)( ]\"",
given_id, book_name, writer, the_year, pub_name);
/* the symbols in the scanf sequence are the only ones we accept to
* be in the strings and we don't want any weird stuff because they
* break the encoding, so we're dropping any books that apper to have
* no authors */
if (strlen(writer) == 0) {
memset(line, 0, sizeof(line));
continue;
}
/* set defaults here */
if (strlen(the_year) == 0)
strcpy(the_year, "0000");
/* check for duplicates */
if (btraverse(atol(given_id), 1) != -1)
continue;
/* Done parsing. Creating book */
Book *B;
B = create_book(atol(given_id), book_name, atoi(the_year), pub_name);
/* creating authors */
split_create_authors(B, writer);
/* put it in the actual database */
db.arr[db.numberOfBooks] = *B;
db.numberOfBooks++;
/* clean */
memset(line, 0, sizeof(line));
/* we copy the data above, so we don't need that */
free(B);
}
fclose(fd);
}
