UNIX 7th Ed. - /usr/src/libc/stdio/findiop.c

   1: #include <stdio.h>
   2: 
   3: FILE *
   4: _findiop()
   5: {
   6:     extern FILE *_lastbuf;
   7:     register FILE *iop;
   8: 
   9:     for(iop = _iob; iop->_flag & (_IOREAD|_IOWRT|_IORW); iop++)
  10:         if (iop >= _lastbuf)
  11:             return(NULL);
  12: 
  13:     return(iop);
  14: }

Defined functions