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/* @(#)fcons.c 2.12 00/12/04 Copyright 1986, 1995 J. Schilling */
/*
* Copyright (c) 1986, 1995 J. Schilling
*/
/*
* This program 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 2, or (at your option)
* any later version.
*
* This program 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 this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "io.h"
/*
* XXX We need to switch to fseeko()/ftello() sometime in the future.
* XXX See io.h hack.
*/
LOCAL char *fmtab[] = {
"", /* 0 FI_NONE */
"r", /* 1 FI_READ */
"w", /* 2 FI_WRITE **1) */
"r+", /* 3 FI_READ | FI_WRITE */
"b", /* 4 FI_NONE | FI_BINARY */
"rb", /* 5 FI_READ | FI_BINARY */
"wb", /* 6 FI_WRITE | FI_BINARY **1) */
"r+b", /* 7 FI_READ | FI_WRITE | FI_BINARY */
};
/*
* NOTES:
* 1) fdopen() guarantees not to create/trunc files in this case
*
* "w" will create/trunc files with fopen()
* "a" will create files with fopen()
*/
EXPORT FILE *
_fcons(fd, f, flag)
register FILE *fd;
int f;
int flag;
{
int my_gflag = _io_glflag;
if (fd == (FILE *)NULL)
fd = fdopen(f, fmtab[flag&(FI_READ|FI_WRITE|FI_BINARY)]);
if (fd != (FILE *)NULL) {
if (flag & FI_APPEND) {
(void) fseek(fd, (off_t)0, SEEK_END);
}
if (flag & FI_UNBUF) {
setbuf(fd, NULL);
my_gflag |= _IOUNBUF;
}
set_my_flag(fd, my_gflag); /* must clear it if fd is reused */
return (fd);
}
if (flag & FI_CLOSE)
close(f);
return ((FILE *) NULL);
}
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