mirror of git://sourceware.org/git/glibc.git
89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/* Copyright (C) 1991, 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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/* Make STREAM use the buffering method given in MODE.
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If MODE indicates full or line buffering, use BUF,
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a buffer of SIZE bytes; if BUF is NULL, malloc a buffer. */
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int
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setvbuf (stream, buf, mode, size)
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FILE *stream;
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char *buf;
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int mode;
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size_t size;
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{
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if (!__validfp (stream))
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{
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__set_errno (EINVAL);
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return EOF;
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}
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/* The ANSI standard says setvbuf can only be called before any I/O is done,
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but we allow it to replace an old buffer, flushing it first. */
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if (stream->__buffer != NULL)
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{
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(void) fflush (stream);
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/* Free the old buffer if it was malloc'd. */
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if (!stream->__userbuf)
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free(stream->__buffer);
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}
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stream->__get_limit = stream->__put_limit = NULL;
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stream->__bufp = stream->__buffer = NULL;
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stream->__userbuf = stream->__linebuf = stream->__linebuf_active = 0;
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switch (mode)
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{
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default:
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__set_errno (EINVAL);
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return EOF;
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case _IONBF: /* Unbuffered. */
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stream->__buffer = NULL;
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stream->__bufsize = 0;
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stream->__userbuf = 1;
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break;
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case _IOLBF: /* Line buffered. */
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stream->__linebuf = 1;
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case _IOFBF: /* Fully buffered. */
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if (size == 0)
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{
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__set_errno (EINVAL);
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return EOF;
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}
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stream->__bufsize = size;
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if (buf != NULL)
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stream->__userbuf = 1;
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else if ((buf = (char *) malloc (size)) == NULL)
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return EOF;
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stream->__buffer = buf;
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break;
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}
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stream->__bufp = stream->__buffer;
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stream->__get_limit = stream->__buffer;
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/* The next output operation will prime the stream for writing. */
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stream->__put_limit = stream->__buffer;
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return 0;
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}
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