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111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
/* Copyright (C) 1991, 1992, 1993 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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define badmode() return ((errno = EINVAL), 0)
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/* Dissect the given mode string into an __io_mode. */
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int
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DEFUN(__getmode, (mode, mptr), CONST char *mode AND __io_mode *mptr)
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{
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register unsigned char i;
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if (mode == NULL)
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badmode ();
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memset ((PTR) mptr, 0, sizeof (*mptr));
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switch (*mode)
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{
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case 'a':
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mptr->__write = mptr->__create = mptr->__append = 1;
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break;
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case 'w':
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mptr->__write = mptr->__create = mptr->__truncate = 1;
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break;
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case 'r':
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mptr->__read = 1;
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break;
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default:
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badmode ();
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}
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for (i = 1; i < 3; ++i)
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{
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++mode;
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if (*mode == '\0')
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break;
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switch (*mode)
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{
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case '+':
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mptr->__read = mptr->__write = 1;
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break;
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case 'b':
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mptr->__binary = 1;
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break;
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}
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}
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if (!mptr->__read && !mptr->__write)
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badmode ();
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mptr->__exclusive = *mode == 'x';
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return 1;
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}
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/* Open a new stream on the given file. */
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FILE *
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DEFUN(fopen, (filename, mode), CONST char *filename AND CONST char *mode)
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{
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FILE *stream;
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__io_mode m;
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if (filename == NULL)
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{
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errno = EINVAL;
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return NULL;
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}
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if (!__getmode (mode, &m))
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return NULL;
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stream = __newstream ();
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if (stream == NULL)
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return NULL;
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if (__stdio_open (filename, m, &stream->__cookie))
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{
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int save = errno;
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(void) fclose (stream);
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errno = save;
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return NULL;
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}
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stream->__mode = m;
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return stream;
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}
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