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/* @(#)fcons.c 2.16 03/06/15 Copyright 1986, 1995-2003 J. Schilling */
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* Copyright (c) 1986, 1995-2003 J. Schilling
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* This program 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
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License along with
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* this program; see the file COPYING. If not, write to the Free Software
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* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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* Note that because of a definition in io.h we are using fseeko()/ftello()
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* instead of fseek()/ftell() if available.
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LOCAL char *fmtab[] = {
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"w", /* 2 FI_WRITE **1) */
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"r+", /* 3 FI_READ | FI_WRITE */
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"b", /* 4 FI_NONE | FI_BINARY */
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"rb", /* 5 FI_READ | FI_BINARY */
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"wb", /* 6 FI_WRITE | FI_BINARY **1) */
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"r+b", /* 7 FI_READ | FI_WRITE | FI_BINARY */
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/* + FI_APPEND */ "", /* 0 FI_NONE */
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/* ... */ "r", /* 1 FI_READ */
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"a", /* 2 FI_WRITE **1) */
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"a+", /* 3 FI_READ | FI_WRITE */
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"b", /* 4 FI_NONE | FI_BINARY */
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"rb", /* 5 FI_READ | FI_BINARY */
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"ab", /* 6 FI_WRITE | FI_BINARY **1) */
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"a+b", /* 7 FI_READ | FI_WRITE | FI_BINARY */
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* 1) fdopen() guarantees not to create/trunc files in this case
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* "w" will create/trunc files with fopen()
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* "a" will create files with fopen()
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int my_gflag = _io_glflag;
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if (fd == (FILE *)NULL)
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fmtab[flag&(FI_READ|FI_WRITE|FI_BINARY | FI_APPEND)]);
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if (fd != (FILE *)NULL) {
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if (flag & FI_APPEND) {
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(void) fseek(fd, (off_t)0, SEEK_END);
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if (flag & FI_UNBUF) {
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set_my_flag(fd, my_gflag); /* must clear it if fd is reused */
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return ((FILE *) NULL);