Reading a csv file to a struct in C - c

Question

The csv files will all have the following format:
Number of Spaces,10,,,,,,,,
,,,,,,,,,
,,,,,,,,,
Type,Set Id,Intraset Id,Name,Property Cost,House Cost,Hotel Cost,Rent,Rent with House,Rent With Hotel
Go,400,MU,,,,,,,
Property,0,0,0A,500,50,50,5,50,2000
Property,0,1,0B,1000,50,50,10,75,2500
Property,1,0,1A,2000,200,200,20,100,3000
Property,1,1,1B,2500,200,200,25,150,3000
Property,1,2,1C,3000,200,200,30,200,3500
Property,2,0,2A,4000,400,400,40,300,4000
Property,2,1,2B,4500,400,400,45,400,4000
Property,2,2,2C,5000,400,400,50,500,4000
Property,2,3,2D,5500,400,400,55,600,4500
The fourth line describes what each field in the lines below it are i.e. for line 5, type is property, set id is 0, name is 0A, etc. I have a struct Space that contains variables for all this information. The 5th line is special: it has type Go, get $400 for passing Go, name is MU, and none of the other fields apply. (This is a version of Monopoly).
Where I'm struggling is how to get the values that I need. So far I have only managed to get the number of spaces value (this determines the number of rows on the board) with this:
void openSpecs(char *fileName) {
FILE* file = fopen(fileName, "r");
if (file == NULL) {
printf("Could not open %s\n", fileName);
}
char c;
do {
fscanf(file, "%c", &c);
//printf("%c", c);
} while (!feof(file) && c != ',');
//printf("\n\n");
int numSpaces;
fscanf(file, "%d", &numSpaces);
//printf("there are %d spaces\n", numSpaces);
// note: the printf statements are there to help me see where I'm at in the file
fclose(file);
}
I'm conflicted on how to approach the rest of the file. I'm thinking of using a while loop to just skip the rest of the commas, and then just reading through line 4, as I don't need to save any of that. From there, I'm not sure what to do. If I use strtok, I need to have a line from the file already as a C string, correct? I can't statically allocate a C string and then use fscanf (no static allocation allowed), so how do I dynamically allocate for a string whose length is unknown?
Edit:
char str[4096];
fgets(str, 4096, file);
printf("%s\n", str);
int goCash = 0;
char* name = NULL;
char delim[2] = ",";
char* token;
token = strtok(str, delim); // this is Go
token = strtok(str, delim);
goCash = (int) token;
token = strtok(str, delim);
strcpy(name, token);
printf("you get %d for going past %s\n", goCash, name);

Answer 1

Be careful as strtok could run in to problems.
For example, consider the the following lines:
Property,0,0,0A,500,50,50,5,50,2000
Property,,0,0A,500,50,50,5,50,2000
Note that in the second line, the second field is missing and you have two consecutive delimiters: ",,". strtok doesn't give you any indication that there was a field missing, it just skips to the next available field.
You can fix this by replacing the occurrences of ,, with , ,
Another issue is that fgets includes the end of line character and you want to remove that.
enum { Type, SetId, IntrasetId, Name, PropertyCost, HouseCost, HotelCost,
Rent, RentwithHouse, RentWithHotel, total };
FILE *fp = fopen("test.txt", "r");
char buf[1000], temp[1000];
while(fgets(temp, sizeof(temp), fp))
{
//remove end of line
temp[strcspn(temp, "\r\n")] = 0;
//replace ",," with ", ,"
int j = 0;
for(int i = 0, len = strlen(temp); i < len; i++)
{
buf[j++] = temp[i];
if (temp[i]==',' && temp[i+1]==',')
buf[j++] = '0';
}
buf[j] = 0;
//read all the fields
char field[total][100];
for(int i = 0; i < total; i++) *field[i] = 0;
int i = 0;
char *ptr = strtok(buf, ",");
while(ptr)
{
strcpy(field[i++], ptr);
ptr = strtok(NULL, ",");
}
for(int i = 0; i < total; i++)
printf("%s, ", field[i]);
printf(" rent(%d)\n", atoi(field[RentWithHotel]));
}
fclose(fp);