source: buchla-68k/orig/RAM/INFIELD.C@ d21fc6f

/*
   =============================================================================
        infield.c -- field input functions
        Version 6 -- 1988-10-20 -- D.N. Lynx Crowe
   =============================================================================
*/

#include "fields.h"
#include "stddefs.h"

extern  short   stcrow, stccol;

/*
   =============================================================================
        infield() -- Determines whether or not a given position is in a field.
        Returns TRUE if in a field, FALSE if not.  If in a field, sets 'infetp'
        to point at the fet entry.  If not in a field, sets 'infetp' to NULL.
   =============================================================================
*/

short
infield(row, col, fetp)
register short row, col;
register struct fet *fetp;
{
        infetp = (struct fet *)NULL;    /* setup for NULL infetp return */

        if ((struct fet *)NULL EQ fetp) /* handle NULL fet pointer */
                return(FALSE);

        while (fetp->redisp) {          /* redisp EQ NULL is end of table */

                if ((row EQ fetp->frow) AND     /* check the entry */
                     (col GE fetp->flcol) AND
                     (col LE fetp->frcol)) {

                        infetp = fetp;          /* set new fet pointer */
                        return(TRUE);           /* return 'found' */
                }

                ++fetp;                         /* advance field pointer */
        }

        return(FALSE);                          /* return 'not found' */
}