csv.c

// Quick 'n' Dirty CSV Parser
// Jesse Costales
// Aug 2021
// rjcostales@gmail.com
//
// Use freely at own risk.

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

int main(int argc, char *argv[])
{
    char buffer[1024];
    char *token, *quote, *comma;;

    while (fgets(buffer, 1024, stdin)) {
        token = buffer;

        while (*token) {

            // remove whitespace
            while (isspace(*token))
                token++;

            // check for quoted token
            if (*token == '"') {
                quote = strchr(token + 1, '"');
                comma = strchr(quote, ',');
            } else
                comma = strchr(token, ',');

            // find comma and print
            if (comma) {
                *comma = '\0';
                printf("%s\t", token);
                token = comma + 1;
            } else {
                printf("%s", token);
                break;
            }
        }
    }

    return 0;
}