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/* print s string and wait for a single key press from stdin. accepts only

/* print s string and wait for a single key press from stdin. accepts only

 * key presses defined in the c ASCIIZ string. returns offset of pressed key

 * key presses defined in the c ASCIIZ string. returns offset of pressed key

 * in string. keys in c MUST BE UPPERCASE! */

 * in string. keys in c MUST BE UPPERCASE! */

unsigned short askchoice(const char *s, const char *c) {

unsigned short askchoice(const char *s, const char *c) {

  unsigned short res;

  unsigned short res;

  char key = 0;

  char key = 0;

  AGAIN:

  AGAIN:

  output(s);

  output(s);

  output(" ");

  output(" ");

  _asm {

  _asm {

    push ax

    push ax

    push dx

    push dx