avro-c code to dump out schema and records from avro datafile as json

gistfile1.c

#include <stdio.h>

#include <avro.h>

int main(int argc, char **argv) {
  avro_file_reader_t reader;
  avro_writer_t stdout_writer = avro_writer_file_fp(stdout, 0);
  avro_schema_t schema;
  avro_datum_t record;
  char *json=NULL;
  
  if(argc < 2) {
    fprintf(stderr, "Please give me an avro file to use\n");
    exit(EXIT_FAILURE);
  }
  
  if(avro_file_reader(argv[1], &reader)) {
    fprintf(stderr, "Unable to open avro file %s: %s\n", argv[1], avro_strerror());
    exit(EXIT_FAILURE);
  }
  schema = avro_file_reader_get_writer_schema(reader);
  printf("*** Schema:\n");
  avro_schema_to_json(schema, stdout_writer);
  printf("\n*** Records:\n");
  while(!avro_file_reader_read(reader, NULL, &record)) {
    avro_datum_to_json(record, 0, &json);
    puts(json);
    free(json);
    avro_datum_decref(record);
  }

  avro_schema_decref(schema);
  avro_file_reader_close(reader);
  printf("\n");
  exit(EXIT_SUCCESS);
}