The C tmpfile function demo

tmpfile.c

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

/* tmpfile function demo program . */

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

    FILE * tmp = tmpfile ( );

    if (!tmp ){
        perror (NULL );
        exit (EXIT_FAILURE );}

    unsigned char dataOut [2 ] = {0x11 , 0x12 };
    fputc (dataOut [0 ] , tmp );
    fputc (dataOut [1 ] , tmp );
    rewind (tmp );

    unsigned char dataIn [2 ];
    dataIn [0 ] = fgetc (tmp );
    dataIn [1 ] = fgetc (tmp );

    printf ("%#x\n%#x\n" , dataIn [0 ] , dataIn [1 ] );
    /* Output :
        0x11
        0x12 */

    if (fclose (tmp ) != 0 ){
        perror (NULL );
        exit (EXIT_FAILURE ); }

    return 0;}