Counting records in Avro file

gistfile1.c

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

int
main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "usage: reader FILENAME\n");
        exit(1);
    }

    avro_file_reader_t reader;
    avro_datum_t datum;
    
    if (avro_file_reader(argv[1], &reader) != 0) {
        fprintf(stderr, "error: can't open");
        exit(1);
    }

    int count = 0;
    for (; avro_file_reader_read(reader, NULL, &datum) == 0; count++) {
    }
    avro_file_reader_close(reader);

    printf("%d\n", count);
}