/* ============== Includes ============== */

# include <stdio.h>

/* ============ Definitions ============= */

# define HELP_SCREEN_SIZE 20
# define MAX_HELP_LINES 9
# define MAX_FLAG_VALUE 0x1000
typedef enum { False=0, True=1 } BOOLEAN; 


/* ======== Function Prototypes ========= */

void   PrintHelpScreen(void);



/* ============== Functions ============= */


void 
PrintHelpScreen(void)
{
    int line;
    
    char *HelpScreen[MAX_HELP_LINES] = {
    "---------------------------------------------",
    "QFdecode  Decodes UVI KPGS quality flag values",
    "",
    "Usage:    QFdecode flag" ,
    "",
    "Params:   flag ->  Quality Flag from UVI KPGS",
    "",
    "Examples: QFdecode 835",
    "---------------------------------------------"
};

    for (line=0; line < MAX_HELP_LINES; )
    {
	printf("%s\n", HelpScreen[line++]);
	if ( !(line % HELP_SCREEN_SIZE) )
	{
            printf("Press ENTER to continue: ");
            getchar();
	} 
    }

} /* PrintHelpScreen */ 



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

	int i;
        int QFcode=-1;

        /* check for input arguments */
        if(argc < 2) {
           PrintHelpScreen();                    
           exit(1);
        }

        sscanf(argv[1],"%d", &QFcode);

        printf("\nQuality Flag: %d\n\n",QFcode);

        if(QFcode == 0) {
           printf("No quality conditions are flagged.\n");
        } else {
           printf("The following quality conditions are flagged:\n\n");
        if((QFcode & 0x01) != 0) printf("QF_SFDU_ERROR: \n");
        if((QFcode & 0x02) != 0) printf("QF_TIME_OUT_OF_BOUNDS: \n");
        if((QFcode & 0x04) != 0) printf("QF_MINOR_FILL: \n");
        if((QFcode & 0x08) != 0) printf("QF_MINOR_SYNC: \n");
        if((QFcode & 0x10) != 0) printf("QF_UNK_INTEGRATION: \n");
        if((QFcode & 0x20) != 0) printf("QF_DSP_MOTION: \n");
        if((QFcode & 0x40) != 0) printf("QF_POINTING:   \n");
        if((QFcode & 0x80) != 0) printf("QF_BAD_TIME:   \n");
        if((QFcode & 0x100) != 0) printf("QF_BAD_STAR:   \n");
        if((QFcode & 0x200) != 0) printf("QF_LZ_GAP:     \n");
        if((QFcode & 0x400) != 0) printf("QF_CALIBRATION:\n");
        if((QFcode & 0x800) != 0) printf("QF_MISSING_BKG_IMAGE: \n");
        if((QFcode & 0x1000) != 0) printf("QF_MISSING_KP_IMAGE: \n");

        if(QFcode > MAX_FLAG_VALUE) printf("UNKNOWN ERROR: \n");
        }

        printf("\n");
} /* main */