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/*
* This file has been modified for the cdrkit suite.
*
* The behaviour and appearence of the program code below can differ to a major
* extent from the version distributed by the original author(s).
*
* For details, see Changelog file distributed with the cdrkit package. If you
* received this file from another source then ask the distributing person for
* a log of modifications.
*
*/
/* @(#)xio.c 1.11 04/07/11 Copyright 2003-2004 J. Schilling */
/*
* EXtended I/O functions for cdrecord
*
* Copyright (c) 2003-2004 J. Schilling
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <mconfig.h>
#include <unixstd.h>
#include <stdxlib.h>
#include <strdefs.h>
#include <standard.h>
#include <fctldefs.h>
#ifdef NEED_O_BINARY
#include <io.h> /* for setmode() prototype */
#endif
#include "xio.h"
static xio_t x_stdin = {
NULL, /* x_next */
NULL, /* x_name */
0, /* x_off */
STDIN_FILENO, /* x_file */
999, /* x_refcnt */
O_RDONLY, /* x_oflag */
0 /* x_omode */
};
static xio_t *x_root = &x_stdin;
static xio_t **x_tail = NULL;
static xio_t *xnewnode(char *name);
void *xopen(char *name, int oflag, int mode);
int xclose(void *vp);
static xio_t *
xnewnode(char *name)
{
xio_t *xp;
if ((xp = malloc(sizeof (xio_t))) == NULL)
return ((xio_t *) NULL);
xp->x_next = (xio_t *) NULL;
xp->x_name = strdup(name);
if (xp->x_name == NULL) {
free(xp);
return ((xio_t *) NULL);
}
xp->x_off = 0;
xp->x_file = -1;
xp->x_refcnt = 1;
xp->x_oflag = 0;
xp->x_omode = 0;
return (xp);
}
void *
xopen(char *name, int oflag, int mode)
{
int f;
xio_t *xp;
xio_t *pp = x_root;
if (x_tail == NULL)
x_tail = &x_stdin.x_next;
if (name == NULL) {
xp = &x_stdin;
xp->x_refcnt++;
#ifdef NEED_O_BINARY
if ((oflag & O_BINARY) != 0) {
setmode(STDIN_FILENO, O_BINARY);
}
#endif
return (xp);
}
for (; pp; pp = pp->x_next) {
if (pp->x_name == NULL) /* stdin avoid core dump in strcmp() */
continue;
if ((strcmp(pp->x_name, name) == 0) &&
(pp->x_oflag == oflag) && (pp->x_omode == mode)) {
break;
}
}
if (pp) {
pp->x_refcnt++;
return ((void *)pp);
}
if ((f = open(name, oflag, mode)) < 0)
return (NULL);
if ((xp = xnewnode(name)) == NULL) {
close(f);
return (NULL);
}
xp->x_file = f;
xp->x_oflag = oflag;
xp->x_omode = mode;
*x_tail = xp;
x_tail = &xp->x_next;
return ((void *)xp);
}
int
xclose(void *vp)
{
xio_t *xp = vp;
xio_t *pp = x_root;
int ret = 0;
if (xp == &x_stdin)
return (ret);
if (x_tail == NULL)
x_tail = &x_stdin.x_next;
if (--xp->x_refcnt <= 0) {
ret = close(xp->x_file);
while (pp) {
if (pp->x_next == xp)
break;
if (pp->x_next == NULL)
break;
pp = pp->x_next;
}
if (pp->x_next == xp) {
if (x_tail == &xp->x_next)
x_tail = &pp->x_next;
pp->x_next = xp->x_next;
}
free(xp->x_name);
free(xp);
}
return (ret);
}
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