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void
lcdCharDef(fd, index, data)
...
lcdPutchar(fd, data)
    int fd
    unsigned char data

extern void lcdCharDef(const int fd, int index, unsigned char data [8]
+);

extern void lcdPutchar(const int fd, unsigned char data);

sub lcd_char_def {
    shift if @_ == 4;
...
    my ($fd, $data) = @_;
    lcdPutchar($fd, $data);
}

#include <stdio.h>

...

    return 0;
}

use warnings;
use strict;
...
lcd_put_char($fd, 2);

sleep 1;