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root/usr/lib/libc/stdio/setvbuf.c

DEFINITIONS

1. setvbuf

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Chris Torek.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include "local.h"
  37 /*
  38  * Set one of the three kinds of buffering, optionally including
  39  * a buffer.
  40  */
  41 int
setvbuf(fp, buf, mode, size)
FILE *fp;
  44         char *buf;
  45         int mode;
size_t size;
  47 {
  48         int ret, flags;
  49         /*      int ttyflag; */
  51         /*
  52          * Verify arguments.  The `int' limit on `size' is due to this
  53          * particular implementation.  Note, buf and size are ignored
  54          * when setting _IONBF.
  55          */
  56         if (mode != _IONBF)
  57                 if ((mode != _IOFBF && mode != _IOLBF) || (int)size < 0)
  58                         return (EOF);
  60         /*
  61          * Write current buffer, if any.  Discard unread input (including
  62          * ungetc data), cancel line buffering, and free old buffer if
  63          * malloc()ed.  We also clear any eof condition, as if this were
  64          * a seek.
  65          */
ret = 0;
  67         (void)__sflush(fp);
  68         if (HASUB(fp))
FREEUB(fp);
fp->_r = 0;
flags = fp->_flags;
  72         if (buf != NULL && (flags & __SMBF))
free((void *)fp->_bf._base);
flags &= ~(__SLBF | __SNBF | __SMBF | __SEOF);
  76         /*
  77          * Fix up the FILE fields, and set __cleanup for output flush on
  78          * exit (since we are buffered in some way).
  79          */
  80         if (mode == _IOLBF)
flags |= __SLBF;
fp->_flags = flags;
  84         /*
  85          * If buffer is NULL, we change only buffering mode.
  86          */
  87         if (buf == NULL)
  88                 return 0;
fp->_bf._base = fp->_p = (unsigned char *)buf;
fp->_bf._size = size;
fp->_w = 0;
__cleanup = _cleanup;
  95         return (ret);
  96 }