c - Capture quoted strings separated with commas from a file

let's say I want to take an input from a file like this :-

"8313515769001870,GRKLK,03/2023,eatcp,btlzg"
"6144115684794523,ZEATL,10/2033,arnne,drrfd"

for a structure I made as follows

typedef struct{

char Card_Number[20];
char Bank_Code[6];
char Expiry_Date[8];
char First_Name[30];
char Last_Name[30];
}Card;

This is my attempt to read the input from a file named 'file' in the reading mode, the str in fgets is storing the right string but it isn't getting absorbed c[i]:

FILE * fptr;
int count=0;
fptr= fopen("file","r");
Card *c = (Card*)calloc(10,sizeof(Card));
printf("StartAlloc\n");
int i=0;
char str[1000];
fgets(str,80,fptr);
if(fptr==NULL)
{return 0;}

do{
     sscanf(str,"\"%[^,],%[^,],%[^,],%[^,],%[^,]\" \n",c[i].Card_Number,c[i].Bank_Code,c[i].Expiry_Date,c[i].First_Name,c[i].Last_Name);
i++;

}while(fgets(str,80,fptr)!=NULL);

I do not understand why the regex %[^,] is not capturing the individual elements, I have wasted a lot of time, and help would be greatly appreciated.

Answer

Using fscanf() with the proper format you can retrieve the desired elements from each line :

"\"%[^,]%*c %[^,]%*c %[^,]%*c %[^,]%*c %[^\"]%*c\n" 

With the previous format, the opening quote is ignored (\"), and the strings separated by commas are captured (%[^,]%*c). Finally the the closing quote is discarded (%[^\"]%*c), and the line break considered (\n), to let next line to be read.

This is how you can integrate it in your code :

while (fscanf(file, "\"%[^,]%*c %[^,]%*c %[^,]%*c %[^,]%*c %[^\"]%*c\n", c[i].Card_Number, c[i].Bank_Code, c[i].Expiry_Date, c[i].First_Name, c[i].Last_Name) != -1 ) i++;

Complete code snippet for testing purposes :

#include 
#include 

typedef struct{
    char Card_Number[20];

    char Bank_Code[6];
    char Expiry_Date[8];
    char First_Name[30];
    char Last_Name[30];
}Card;

int main(){
    FILE *file;
    file = fopen("data.csv", "r");
    int i=0;

    Card *c = (Card*)calloc(10,sizeof(Card));

    while (fscanf(file, "\"%[^,]%*c %[^,]%*c %[^,]%*c %[^,]%*c %[^\"]%*c\n", c[i].Card_Number, c[i].Bank_Code, c[i].Expiry_Date, c[i].First_Name, c[i].Last_Name) != -1 ) {
        printf("%s | %s | %s | %s | %s \n", c[i].Card_Number, c[i].Bank_Code, c[i].Expiry_Date, c[i].First_Name, c[i].Last_Name);
        i++;
    }
    fclose(file);
    return 0;
}