/* Grin_du_Jour.rexx  - uses micros to pick 1 of 3000 locations */

FF='0C'x  /* FormFeed */
CR='0D'x  /* Carraige Return */
SIGNAL ON BREAK_C
SIGNAL ON BREAK_E

ARG name .

bbspath=GETCLIP('BBS_path')
filename=bbspath'rexxDoors/Data/Grins' /* Formfeed separated text */
size=WORD(STATEF(filename),2)
size=TRUNC(size-(size/3000))             /* allow for last grin */

x=OPEN(f,'RAM:DUMMY','W')              /* write to a dummy file */
IF x=0 THEN RETURN(20);
CALL WRITELN(f,'dummy')
CALL CLOSE(f)
micros=WORD(STATEF('RAM:DUMMY'),7)      /* get the microseconds */
location=TRUNC(size*(micros/3000))      /*  0 >= micros < 3000  */

x=OPEN(f,filename,'R')
IF x=0 THEN RETURN(10);

CALL SEEK(f,location,'B')          /* point to the random place */
line=''
DO WHILE line~=FF & ~EOF(f)      /* find the start (a formfeed) */
  line=READLN(f)
END
line=''
IF ~EOF(f) THEN    /* if EOF then must be right at end. missed! */
  DO WHILE line~=FF & ~EOF(f)       /* otherwise, show the page */
    line=READLN(f)
    IF ~EOF(f) & line~=FF THEN SAY line||CR
  END
BREAK_C:
BREAK_E:
CALL CLOSE(f)
RETURN(0);
EXIT;                          /* a little redundant, so sue me! */