3abd3e0bcc
* lib/linux/lseek.c (_lseek): New function. * lib/linux/lseek.c (lseek): Use it to check if we should reset read buffer. * lib/mes/__buffered_read.c (__read_buffer_max): New variable. (__buffered_read_init): Add environment override: MES_READ_BUFFER. (__buffered_read): Use it.
75 lines
2 KiB
C
75 lines
2 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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* Copyright © 2018 Jeremiah Orians <jeremiah@pdp10.guru>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mes/lib.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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FILE *
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fopen (char const *file_name, char const *opentype)
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{
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if (__mes_debug ())
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{
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eputs ("fopen ");
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eputs (file_name);
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eputs (" ");
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eputs (opentype);
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eputs ("\n");
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}
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int fd;
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int mode = 0600;
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if ((opentype[0] == 'a' || !strcmp (opentype, "r+")) && !access (file_name, O_RDONLY))
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{
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int flags = O_RDWR;
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if (opentype[0] == 'a')
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flags |= O_APPEND;
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fd = _open3 (file_name, flags, mode);
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}
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else if (opentype[0] == 'w' || opentype[0] == 'a' || !strcmp (opentype, "r+"))
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{
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char *plus_p = strchr (opentype, '+');
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int flags = plus_p ? O_RDWR | O_CREAT : O_WRONLY | O_CREAT | O_TRUNC;
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fd = _open3 (file_name, flags, mode);
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}
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else
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fd = _open3 (file_name, O_RDONLY, 0);
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if (__mes_debug ())
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{
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eputs (" => fd=");
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eputs (itoa (fd));
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eputs ("\n");
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}
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if (!fd)
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{
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eputs (" ***MES LIB C*** fopen of stdin: signal me in band\n");
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assert (0);
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}
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if (fd < 0)
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fd = 0;
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return (FILE *) (long) fd;
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}
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