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 /*
  12  * @implemented
  13  */
  14 int setvbuf(FILE *f, char *buf, int type, size_t len)
  15 {
  16   int mine=0;
  17   if (!__validfp (f) ) {
  18         __set_errno (EINVAL);
  19         return 0;
  20   }
  21   if ( f->_base != NULL )
  22         fflush(f);
  23   switch (type)
  24   {
  25   case _IOFBF:
  26   case _IOLBF:
  27     if (len <= 0) {
  28         __set_errno (EINVAL);
  29         return EOF;
  30     }
  31     if (buf == 0)
  32     {
  33       buf = (char *)malloc(len+1);
  34       if (buf == NULL) {
  35         __set_errno (ENOMEM);
  36         return -1;
  37       }
  38       mine = 1;
  39     }
  40     /* FALLTHROUGH */
  41   case _IONBF:
  42     if (f->_base != NULL && f->_flag & _IOMYBUF)
  43       free(f->_base);
  44     f->_cnt = 0;
  45
  46     f->_flag &= ~(_IONBF|_IOFBF|_IOLBF|_IOUNGETC);
  47     f->_flag |= type;
  48     if (type != _IONBF)
  49     {
  50       if (mine)
  51         f->_flag |= _IOMYBUF;
  52       f->_ptr = f->_base = buf;
  53       f->_bufsiz = len;
  54     }
  55     else
  56     {
  57       f->_base = 0;
  58       f->_bufsiz = 0;
  59     }
  60     return 0;
  61   default:
  62       __set_errno (EINVAL);
  63       return EOF;
  64   }
  65 }