2.9BSD - /usr/src/lib/c/stdio/filbuf.c

   1: #include    <stdio.h>
   2: 
   3: char    *malloc();
   4: 
   5: _filbuf(iop)
   6: register FILE *iop;
   7: {
   8:     static char smallbuf[_NFILE];
   9: 
  10:     if (iop->_flag & _IORW)
  11:         iop->_flag |= _IOREAD;
  12: 
  13:     if ((iop->_flag & _IOREAD) == 0 || iop->_flag & _IOSTRG)
  14:         return(EOF);
  15: tryagain:
  16:     if (iop->_base == NULL) {
  17:         if (iop->_flag & _IONBF) {
  18:             iop->_base = &smallbuf[fileno(iop)];
  19:             goto tryagain;
  20:         }
  21:         if ((iop->_base = malloc(BUFSIZ)) == NULL) {
  22:             iop->_flag |= _IONBF;
  23:             goto tryagain;
  24:         }
  25:         iop->_flag |= _IOMYBUF;
  26:     }
  27: #ifdef UCB_LINEBUF
  28:     if (iop == stdin && (stdout->_flag&_IOLBF))
  29:         fflush(stdout);
  30: #endif UCB_LINEBUF
  31:     iop->_cnt = read(fileno(iop), iop->_base, iop->_flag&_IONBF?1:BUFSIZ);
  32:     iop->_ptr = iop->_base;
  33:     if (--iop->_cnt < 0) {
  34:         if (iop->_cnt == -1) {
  35:             iop->_flag |= _IOEOF;
  36:             if (iop->_flag & _IORW)
  37:                 iop->_flag &= ~_IOREAD;
  38:         } else
  39:             iop->_flag |= _IOERR;
  40:         iop->_cnt = 0;
  41:         return(EOF);
  42:     }
  43:     return(*iop->_ptr++ & 0377);
  44: }

Defined functions