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/* $OpenBSD: mio.c,v 1.7 2009/08/21 16:48:03 ratchov Exp $ */
/*
* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "mio_priv.h"
#ifdef DEBUG
/*
* debug level, -1 means uninitialized
*/
int mio_debug = -1;
#endif
struct mio_hdl *
mio_open(const char *str, unsigned mode, int nbio)
{
static char prefix_midithru[] = "midithru";
static char prefix_rmidi[] = "rmidi";
static char prefix_aucat[] = "aucat";
struct mio_hdl *hdl;
struct stat sb;
char *sep, buf[4];
int len;
#ifdef DEBUG
char *dbg;
if (mio_debug < 0) {
dbg = issetugid() ? NULL : getenv("MIO_DEBUG");
if (!dbg || sscanf(dbg, "%u", &mio_debug) != 1)
mio_debug = 0;
}
#endif
if ((mode & (MIO_OUT | MIO_IN)) == 0)
return NULL;
if (str == NULL && !issetugid())
str = getenv("MIDIDEVICE");
if (str == NULL) {
hdl = mio_open_thru("0", mode, nbio);
if (hdl != NULL)
return hdl;
return mio_open_rmidi("0", mode, nbio);
}
sep = strchr(str, ':');
if (sep == NULL) {
/*
* try legacy "/dev/rmidioxxx" device name
*/
if (stat(str, &sb) < 0 || !S_ISCHR(sb.st_mode)) {
DPRINTF("mio_open: %s: missing ':' separator\n", str);
return NULL;
}
snprintf(buf, sizeof(buf), "%u", minor(sb.st_rdev));
return mio_open_rmidi(buf, mode, nbio);
}
len = sep - str;
if (len == (sizeof(prefix_midithru) - 1) &&
memcmp(str, prefix_midithru, len) == 0)
return mio_open_thru(sep + 1, mode, nbio);
if (len == (sizeof(prefix_aucat) - 1) &&
memcmp(str, prefix_aucat, len) == 0)
return mio_open_aucat(sep + 1, mode, nbio);
if (len == (sizeof(prefix_rmidi) - 1) &&
memcmp(str, prefix_rmidi, len) == 0)
return mio_open_rmidi(sep + 1, mode, nbio);
DPRINTF("mio_open: %s: unknown device type\n", str);
return NULL;
}
void
mio_create(struct mio_hdl *hdl, struct mio_ops *ops, unsigned mode, int nbio)
{
hdl->ops = ops;
hdl->mode = mode;
hdl->nbio = nbio;
hdl->eof = 0;
}
void
mio_close(struct mio_hdl *hdl)
{
hdl->ops->close(hdl);
}
size_t
mio_read(struct mio_hdl *hdl, void *buf, size_t len)
{
if (hdl->eof) {
DPRINTF("mio_read: eof\n");
return 0;
}
if (!(hdl->mode & MIO_IN)) {
DPRINTF("mio_read: not input device\n");
hdl->eof = 1;
return 0;
}
if (len == 0) {
DPRINTF("mio_read: zero length read ignored\n");
return 0;
}
return hdl->ops->read(hdl, buf, len);
}
size_t
mio_write(struct mio_hdl *hdl, const void *buf, size_t len)
{
if (hdl->eof) {
DPRINTF("mio_write: eof\n");
return 0;
}
if (!(hdl->mode & MIO_OUT)) {
DPRINTF("mio_write: not output device\n");
hdl->eof = 1;
return 0;
}
if (len == 0) {
DPRINTF("mio_write: zero length write ignored\n");
return 0;
}
return hdl->ops->write(hdl, buf, len);
}
int
mio_nfds(struct mio_hdl *hdl)
{
return 1;
}
int
mio_pollfd(struct mio_hdl *hdl, struct pollfd *pfd, int events)
{
if (hdl->eof)
return 0;
return hdl->ops->pollfd(hdl, pfd, events);
}
int
mio_revents(struct mio_hdl *hdl, struct pollfd *pfd)
{
if (hdl->eof)
return POLLHUP;
return hdl->ops->revents(hdl, pfd);
}
int
mio_eof(struct mio_hdl *hdl)
{
return hdl->eof;
}
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