mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-18 05:53:36 +08:00
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
/* Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
|
||
This file is part of the GNU C Library.
|
||
|
||
The GNU C Library is free software; you can redistribute it and/or
|
||
modify it under the terms of the GNU Library General Public License as
|
||
published by the Free Software Foundation; either version 2 of the
|
||
License, or (at your option) any later version.
|
||
|
||
The GNU C 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
|
||
Library General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Library General Public
|
||
License along with the GNU C Library; see the file COPYING.LIB. If
|
||
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
||
Cambridge, MA 02139, USA. */
|
||
|
||
#include <ansidecl.h>
|
||
#include <ctype.h>
|
||
#include <errno.h>
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
|
||
|
||
#define badmode() return ((errno = EINVAL), 0)
|
||
|
||
/* Dissect the given mode string into an __io_mode. */
|
||
int
|
||
DEFUN(__getmode, (mode, mptr), CONST char *mode AND __io_mode *mptr)
|
||
{
|
||
register unsigned char i;
|
||
|
||
if (mode == NULL)
|
||
badmode ();
|
||
|
||
memset ((PTR) mptr, 0, sizeof (*mptr));
|
||
|
||
switch (*mode)
|
||
{
|
||
case 'a':
|
||
mptr->__write = mptr->__create = mptr->__append = 1;
|
||
break;
|
||
case 'w':
|
||
mptr->__write = mptr->__create = mptr->__truncate = 1;
|
||
break;
|
||
case 'r':
|
||
mptr->__read = 1;
|
||
break;
|
||
default:
|
||
badmode ();
|
||
}
|
||
|
||
for (i = 1; i < 3; ++i)
|
||
{
|
||
++mode;
|
||
if (*mode == '\0')
|
||
break;
|
||
switch (*mode)
|
||
{
|
||
case '+':
|
||
mptr->__read = mptr->__write = 1;
|
||
break;
|
||
case 'b':
|
||
mptr->__binary = 1;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (!mptr->__read && !mptr->__write)
|
||
badmode ();
|
||
|
||
mptr->__exclusive = *mode == 'x';
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Open a new stream on the given file. */
|
||
FILE *
|
||
DEFUN(fopen, (filename, mode), CONST char *filename AND CONST char *mode)
|
||
{
|
||
FILE *stream;
|
||
__io_mode m;
|
||
|
||
if (filename == NULL)
|
||
{
|
||
errno = EINVAL;
|
||
return NULL;
|
||
}
|
||
|
||
if (!__getmode (mode, &m))
|
||
return NULL;
|
||
|
||
stream = __newstream ();
|
||
if (stream == NULL)
|
||
return NULL;
|
||
|
||
if (__stdio_open (filename, m, &stream->__cookie))
|
||
{
|
||
int save = errno;
|
||
(void) fclose (stream);
|
||
errno = save;
|
||
return NULL;
|
||
}
|
||
|
||
stream->__mode = m;
|
||
|
||
return stream;
|
||
}
|