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char data[BUF_SIZBUFSIZ];
char append_data[BUF_SIZ]BUFSIZ];
char *filename;
FILE *file;

/* initialize filename */

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

/* Initializeinitialize append_data */

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

fclose(file);

char data[BUF_SIZBUFSIZ];
char append_data[BUF_SIZ]BUFSIZ];
char *filename;
FILE *file;

/* initialize filename */

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

/* Initializeinitialize append_data */

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

fclose(file);