113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
/* Copyright (C) 1991, 92, 93, 96, 97, 98 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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 ((__set_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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__getmode (const char *mode, __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 ((void *) 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 < 4; ++i)
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{
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switch (*++mode)
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{
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case '\0':
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break;
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case '+':
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mptr->__read = mptr->__write = 1;
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continue;
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case 'b':
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mptr->__binary = 1;
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continue;
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case 'x':
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mptr->__exclusive = 1;
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continue;
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}
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break;
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}
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if (!mptr->__read && !mptr->__write)
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badmode ();
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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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fopen (filename, mode)
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const char *filename;
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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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__set_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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__set_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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