From 96aa2d94a2355cdc55c96e808d14a0e7f2ebe77d Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Mon, 20 Nov 1995 03:48:11 +0000 Subject: Sat Nov 18 16:46:01 1995 Ulrich Drepper * libio/Makefile, libio/cleanup.c, libio/clearerr.c, libio/feof.c, libio/ferror.c, libio/fgetc.c, libio/filedoalloc.c, libio/fileno.c, libio/fileops.c, libio/fputc.c, libio/freopen.c, libio/fseek.c, libio/genops.c, libio/getc.c, libio/getchar.c, libio/iofclose.c, libio/iofdopen.c, libio/iofflush.c, libio/iofgetpos.c, libio/iofgets.c, libio/iofopen.c, libio/iofprintf.c, libio/iofputs.c, libio/iofread.c, libio/iofscanf.c, libio/iofsetpos.c, libio/ioftell.c, libio/iofwrite.c, libio/iogetdelim.c, libio/iogetline.c, libio/iogets.c, libio/iolibio.h, libio/iopadn.c, libio/ioprims.c, libio/ioputs.c, libio/ioseekoff.c, libio/ioseekpos.c, libio/iosetbuffer.c, libio/iosetvbuf.c, libio/iosprintf.c, libio/ioungetc.c, libio/iovsprintf.c, libio/iovsscanf.c, libio/libio.h, libio/libioP.h, libio/putc.c, libio/putchar.c, libio/rewind.c, libio/setbuf.c, libio/setlinebuf.c, libio/stdfiles.c, libio/stdio.c, libio/stdio.h, libio/strfile.h, libio/strops.c, libio/vasprintf.c, libio/vscanf.c, libio/vsnprintf.c: New files. Slightly modified version from Linux libc. * libio/memstream.c, libio/vdprintf.c: New files for functions not (yet) part of GNU libio. * libio/iofopncook.c: Implementation of `fopencookie', mainly written by Per Bothner. * stdio-common/getline.c: Adapted to libio. * stdio-common/snprintf.c: Adapted to libio. * stdio-common/vfprintf.c: Adapted to libio. * stdio-common/vfscanf.c: Adapted to libio. * sysdeps/posix/tempname.c: Adapted to libio. --- libio/iosetvbuf.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 libio/iosetvbuf.c (limited to 'libio/iosetvbuf.c') diff --git a/libio/iosetvbuf.c b/libio/iosetvbuf.c new file mode 100644 index 0000000000..316179e330 --- /dev/null +++ b/libio/iosetvbuf.c @@ -0,0 +1,80 @@ +/* +Copyright (C) 1993 Free Software Foundation + +This file is part of the GNU IO Library. This library is free +software; you can redistribute it and/or modify it under the +terms of the GNU General Public License as published by the +Free Software Foundation; either version 2, or (at your option) +any later version. + +This library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this library; see the file COPYING. If not, write to the Free +Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +As a special exception, if you link this library with files +compiled with a GNU compiler to produce an executable, this does not cause +the resulting executable to be covered by the GNU General Public License. +This exception does not however invalidate any other reasons why +the executable file might be covered by the GNU General Public License. */ + +#include "libioP.h" + +#define _IOFBF 0 /* Fully buffered. */ +#define _IOLBF 1 /* Line buffered. */ +#define _IONBF 2 /* No buffering. */ + +int +_IO_setvbuf (fp, buf, mode, size) + _IO_FILE* fp; + char* buf; + int mode; + _IO_size_t size; +{ + CHECK_FILE (fp, EOF); + switch (mode) + { + case _IOFBF: + fp->_IO_file_flags &= ~_IO_LINE_BUF; + if (buf == NULL) + { + if (fp->_IO_buf_base == NULL) + { + /* There is no flag to distinguish between "fully buffered + mode has been explicitly set" as opposed to "line + buffering has not been explicitly set". In both + cases, _IO_LINE_BUF is off. If this is a tty, and + _IO_filedoalloc later gets called, it cannot know if + it should set the _IO_LINE_BUF flag (because that is + the default), or not (because we have explicitly asked + for fully buffered mode). So we make sure a buffer + gets allocated now, and explicitly turn off line + buffering. + + A possibly cleaner alternative would be to add an + extra flag, but then flags are a finite resource. */ + if (_IO_DOALLOCATE (fp) < 0) + return EOF; + fp->_IO_file_flags &= ~_IO_LINE_BUF; + } + return 0; + } + break; + case _IOLBF: + fp->_IO_file_flags |= _IO_LINE_BUF; + if (buf == NULL) + return 0; + break; + case _IONBF: + buf = NULL; + size = 0; + break; + default: + return EOF; + } + return _IO_SETBUF (fp, buf, size) == NULL ? EOF : 0; +} -- cgit v1.2.3