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char data[BUFSIZ];
char append_data[BUFSIZ];
char *filenamefile_name;
FILE *file;

/* initialize filenamefile_name */

file = fopen(filenamefile_name, "a+");
if (file == NULL) {
  /* handle error */
}

/* initialize append_data */

if (fwrite(append_data, BUFSIZ, 1, file) != BUFSIZ) {
  /* handle error */
}
if (fread(data, BUFSIZ, 1, file) != 0) {
  /* handle there not being data */
}

fclose(file);

char data[BUFSIZ];
char append_data[BUFSIZ];
char *filenamefile_name;
FILE *file;

/* initialize filenamefile_name */

file = fopen(filenamefile_name, "a+");
if (file == NULL) {
  /* handle error */
}

/* initialize append_data */

if (fwrite(append_data, BUFSIZ, 1, file) != BUFSIZ) {
  /* Handle error */
}
fflush(file);
if (fread(data, BUFSIZ, 1, file) != 0) {
  /* handle there not being data */
}

fclose(file);