reactos/lib/crtdll/stdio/setvbuf.c

   1 /* Copyright (C) 1998 DJ Delorie, see COPYING.DJ for details */
   2 /* Copyright (C) 1996 DJ Delorie, see COPYING.DJ for details */
   3 /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
   4 #include <msvcrt/stdio.h>
   5 #include <msvcrt/stdlib.h>
   6 #include <msvcrt/io.h>
   7 #include <msvcrt/errno.h>
   8 #include <msvcrt/internal/file.h>
   9
  10
  11 int setvbuf(FILE *f, char *buf, int type, size_t len)
  12 {
  13   int mine=0;
  14   if (!__validfp (f) ) {
  15         __set_errno (EINVAL);
  16         return 0;
  17   }
  18   if ( f->_base != NULL )
  19         fflush(f);
  20   switch (type)
  21   {
  22   case _IOFBF:
  23   case _IOLBF:
  24     if (len <= 0) {
  25         __set_errno (EINVAL);
  26         return EOF;
  27     }
  28     if (buf == 0)
  29     {
  30       buf = (char *)malloc(len+1);
  31       if (buf == NULL) {
  32         __set_errno (ENOMEM);
  33         return -1;
  34       }
  35       mine = 1;
  36     }
  37     /* FALLTHROUGH */
  38   case _IONBF:
  39     if (f->_base != NULL && f->_flag & _IOMYBUF)
  40       free(f->_base);
  41     f->_cnt = 0;
  42
  43     f->_flag &= ~(_IONBF|_IOFBF|_IOLBF|_IOUNGETC);
  44     f->_flag |= type;
  45     if (type != _IONBF)
  46     {
  47       if (mine)
  48         f->_flag |= _IOMYBUF;
  49       f->_ptr = f->_base = buf;
  50       f->_bufsiz = len;
  51     }
  52     else
  53     {
  54       f->_base = 0;
  55       f->_bufsiz = 0;
  56     }
  57     return 0;
  58   default:
  59       __set_errno (EINVAL);
  60       return EOF;
  61   }
  62 }