75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
/* -*-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;
|
|
}
|