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

   1: #include    <stdio.h>
   2: 
   3: char    *malloc();
   4: 
   5: 
   6: int
   7: _filbuf(iop)
   8:     register FILE *iop;
   9: {
  10:     static char smallbuf[_NFILE];
  11: 
  12:     if (iop->_flag & _IORW)
  13:         iop->_flag |= _IOREAD;
  14: 
  15:     if ((iop->_flag & _IOREAD) == 0 || iop->_flag & _IOSTRG)
  16:         return(EOF);
  17: 
  18: tryagain:
  19:     if (iop->_base == NULL) {
  20:         if (iop->_flag & _IONBF) {
  21:             iop->_base = &smallbuf[fileno(iop)];
  22:             goto tryagain;
  23:         }
  24:         if ((iop->_base = malloc(BUFSIZ)) == NULL) {
  25:             iop->_flag |= _IONBF;
  26:             goto tryagain;
  27:         }
  28:         iop->_flag |= _IOMYBUF;
  29:     }
  30:     iop->_ptr = iop->_base;
  31:     iop->_cnt = read(fileno(iop), iop->_ptr, iop->_flag&_IONBF?1:BUFSIZ);
  32:     if (--iop->_cnt < 0) {
  33:         if (iop->_cnt == -1) {
  34:             iop->_flag |= _IOEOF;
  35:             if (iop->_flag & _IORW)
  36:                 iop->_flag &= ~_IOREAD;
  37:         } else
  38:             iop->_flag |= _IOERR;
  39:         iop->_cnt = 0;
  40:         return(EOF);
  41:     }
  42:     return(*iop->_ptr++ & 0377);
  43: }

Defined functions