CSV fucking tool

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

#define MAX 10

const char deteminator = ';';

int ReadNextString(FILE *, char *, int);

int main(int argc, char **argv) {

    char *vzorek = argv[1];
    char string[MAX];
    int read_return;
    int sloupec = 1;
    int radek = 1;
    FILE *file;

    if (argc == 2) {
        file = stdin;
    }
    else if (argc == 3) {
        if ((file = fopen(argv[2], "r")) == NULL) {
            fprintf(stderr, "Error opening file '%s'", argv[2]);
            exit(1);
        }
    }
    else {
        fprintf(stderr,"Arguments error");
        exit(1);
    }

    while(1) {
        memset(string, '\0', sizeof(char)*10);
        read_return = ReadNextString(file, string, MAX);
        if (strstr(string, vzorek) != NULL) {
            printf("%s sloupec: %d radek: %d\n", string, sloupec, radek);
        }
        if (read_return == 10) {
            radek++;
            sloupec = 1;
        }
        if (read_return == deteminator) {
            sloupec ++;
        }
        if (read_return == -1) {
            break;
        }
        if (read_return == -2) {
            fprintf(stderr, "Too long word, row: %d column: %d", radek, sloupec);
            exit(1);
        }
    }
    return 0;
}

int ReadNextString(FILE *file, char *string, int max) {
    int c;
    int counter = 0;
    while (1) {
        c = getc(file);
        if (feof(file)) {
            return -1;
        }
        if (c == 10) {
            return c;
        }
        if (c == deteminator) {
            return deteminator;
        }
        if (c != deteminator && counter >= max) {
            return -2;
        }
        else {
            string[counter] = c;
            counter++;
        }
    }
}