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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
* Copyright © 2018 Jeremiah Orians <jeremiah@pdp10.guru>
*
* This file is part of GNU Mes.
*
* GNU Mes 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 3 of the License, or (at
* your option) any later version.
*
* GNU Mes 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mes/lib.h>
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
FILE *
fopen (char const *file_name, char const *opentype)
{
if (__mes_debug ())
{
eputs ("fopen ");
eputs (file_name);
eputs (" ");
eputs (opentype);
eputs ("\n");
}
int fd;
int mode = 0600;
if ((opentype[0] == 'a' || !strcmp (opentype, "r+")) && !access (file_name, O_RDONLY))
{
int flags = O_RDWR;
if (opentype[0] == 'a')
flags |= O_APPEND;
fd = _open3 (file_name, flags, mode);
}
else if (opentype[0] == 'w' || opentype[0] == 'a' || !strcmp (opentype, "r+"))
{
char *plus_p = strchr (opentype, '+');
int flags = plus_p ? O_RDWR | O_CREAT : O_WRONLY | O_CREAT | O_TRUNC;
fd = _open3 (file_name, flags, mode);
}
else
fd = _open3 (file_name, O_RDONLY, 0);
if (__mes_debug ())
{
eputs (" => fd=");
eputs (itoa (fd));
eputs ("\n");
}
if (!fd)
{
eputs (" ***MES LIB C*** fopen of stdin: signal me in band\n");
assert (0);
}
if (fd < 0)
fd = 0;
return (FILE *) (long) fd;
}
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