Filter Queries in a text file in c

Question

question from:https://stackoverflow.com/questions/65912651/filter-queries-in-a-text-file-in-c

Answer 1

It seems that the input file is actually CSV format. I would suggest to refer to Read .csv file in C

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

const char* getfield(char* line, int num)
{
    const char* tok;
    for (tok = strtok(line, ",");
            tok && *tok;
            tok = strtok(NULL, ";
"))
    {
        if (!--num)
            return tok;
    }
    return NULL;
}

int main()
{
    FILE* stream = fopen("input", "r");

    char line[1024];
    while (fgets(line, 1024, stream))
    {
        char* tmp = strdup(line);
        printf("Field 3 would be %s
", getfield(tmp, 3));
        // NOTE strtok clobbers tmp
        free(tmp);
    }
}

You could also looks for CSV parser libraries such as: https://github.com/semitrivial/csv_parser