Read textfile line by line and scan from buffert - C - c

Question

I have made a program which handles and stores records of movies in a library. This is how my library looks like when I print it out to a file.
So basicly my problem is to read this file and save those columns in my struct of variables and dynamically increase the size of the struct for every entry.
Right now I have a while loop reading line by line into a buffert and I am then trying to scan the values from the buffert.
I know the format of the spacings in between the columns if that helps.(No it's not tabs, would that help?)
Else i thought about once it finds "two spaces" it could parse onto the next one...
What I'm looking for is something like this:
("%s %d %d %d %s %d", name, &id, &qty, &price, genre, &year)
This is how the textfile looks like: "test.txt" (UPDATED version below)
-------------------------------------------------------------------------------
NAME ID QTY PRICE GENRE YEAR
-------------------------------------------------------------------------------
THE SHAWSHANK REDEMPTION 1 25 99 Crime 1994
THE GODFATHER 2 65 199 Crime 1972
PULP FICTION 3 265 99 Drama 1994
THE LORD OF THE RINGS 4 1024 199 Action 2003
THE DARK KNIGHT 5 99 99 Action 2008
And this is how my code looks like:
void read_from_file(struct movies *movie)
{
FILE *fp;
char buffer[1024];
int line_num = 0;
int index = 0;
fp = fopen("test.txt", "r");
if ( fp == NULL )
{
printf("Error opening file!\n");
exit(1);
}
fgets(buffer, 1024, fp); fgets(buffer, 1024, fp); fgets(buffer, 1024, fp); // Skip 3 first lines (header)
while(fgets(buffer, 1024, fp) != NULL) // read one line to buffer at a time
{
printf("%s", buffer); //DEBUG
// Trying here to read only the names which i know should be no longer than 40chars. first row goes well, then it's messed up
sscanf(buffer, "%40[^\0]" , movie[index].name);
index++;
}
fclose(fp);
getch();
}
Update: I changed the format of the storage file to the following:
THE SHAWSHANK REDEMPTION,1,25,99,Crime,1994
THE GODFATHER,2,75,199,Crime,1972
PULP FICTION,3,512,99,Drama,2000
THE LORD OF THE RINGS,4,1024,199,Action,2003
THE DARK KNIGHT,5,99,99,Action,2008

Answer 1

The main problem is that there is no single char delimiter. So process the first 45 char;
while(fgets(buffer, sizeof buffer, fp) != NULL) {
printf("%s", buffer); //DEBUG
if (strlen(buf < 80)) {
handle_short_line_error();
}
size_t len;
for (len = 45; len > 0; len--) {
if (!isspace(buf[len-1])) {
break;
}
}
if (!IsAGoodLength(len)) {
handle_format_error();
}
memcpy(movie[index].name, buf, len);
movie[index].name[len] = '\0';
if (5 != sscanf(&buffer[45], "%d%d%d%9s%d", &id, &qty, &price, genre, &year)) {
handle_format_error();
}
// Use other fields scanned
index++;
}