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https://github.com/ericonr/sndio.git
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7fa1603c83
midi-related functions and put them in files named mio_<backend>.c No behaviour changes.
179 lines
3.9 KiB
C
179 lines
3.9 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "mio_priv.h"
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#ifdef COMPAT_ISSETUGID
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#include "bsd-compat.h"
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#endif
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#ifdef DEBUG
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/*
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* debug level, -1 means uninitialized
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*/
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int mio_debug = -1;
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#endif
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struct mio_hdl *
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mio_open(const char *str, unsigned mode, int nbio)
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{
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static char prefix_midithru[] = "midithru";
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static char prefix_rmidi[] = "rmidi";
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static char prefix_aucat[] = "aucat";
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struct mio_hdl *hdl;
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struct stat sb;
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char *sep, buf[4];
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int len;
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#ifdef DEBUG
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char *dbg;
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if (mio_debug < 0) {
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dbg = issetugid() ? NULL : getenv("MIO_DEBUG");
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if (!dbg || sscanf(dbg, "%u", &mio_debug) != 1)
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mio_debug = 0;
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}
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#endif
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if ((mode & (MIO_OUT | MIO_IN)) == 0)
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return NULL;
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if (str == NULL && !issetugid())
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str = getenv("MIDIDEVICE");
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if (str == NULL) {
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hdl = mio_midithru_open("0", mode, nbio);
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if (hdl != NULL)
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return hdl;
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return mio_rmidi_open("0", mode, nbio);
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}
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sep = strchr(str, ':');
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if (sep == NULL) {
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/*
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* try legacy "/dev/rmidioxxx" device name
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*/
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if (stat(str, &sb) < 0 || !S_ISCHR(sb.st_mode)) {
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DPRINTF("mio_open: %s: missing ':' separator\n", str);
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return NULL;
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}
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snprintf(buf, sizeof(buf), "%u", minor(sb.st_rdev));
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return mio_rmidi_open(buf, mode, nbio);
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}
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len = sep - str;
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if (len == (sizeof(prefix_midithru) - 1) &&
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memcmp(str, prefix_midithru, len) == 0)
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return mio_midithru_open(sep + 1, mode, nbio);
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if (len == (sizeof(prefix_aucat) - 1) &&
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memcmp(str, prefix_aucat, len) == 0)
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return mio_aucat_open(sep + 1, mode, nbio);
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if (len == (sizeof(prefix_rmidi) - 1) &&
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memcmp(str, prefix_rmidi, len) == 0)
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return mio_rmidi_open(sep + 1, mode, nbio);
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DPRINTF("mio_open: %s: unknown device type\n", str);
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return NULL;
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}
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void
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mio_create(struct mio_hdl *hdl, struct mio_ops *ops, unsigned mode, int nbio)
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{
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hdl->ops = ops;
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hdl->mode = mode;
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hdl->nbio = nbio;
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hdl->eof = 0;
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}
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void
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mio_close(struct mio_hdl *hdl)
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{
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hdl->ops->close(hdl);
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}
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size_t
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mio_read(struct mio_hdl *hdl, void *buf, size_t len)
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{
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if (hdl->eof) {
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DPRINTF("mio_read: eof\n");
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return 0;
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}
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if (!(hdl->mode & MIO_IN)) {
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DPRINTF("mio_read: not input device\n");
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hdl->eof = 1;
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return 0;
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}
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if (len == 0) {
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DPRINTF("mio_read: zero length read ignored\n");
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return 0;
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}
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return hdl->ops->read(hdl, buf, len);
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}
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size_t
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mio_write(struct mio_hdl *hdl, const void *buf, size_t len)
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{
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if (hdl->eof) {
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DPRINTF("mio_write: eof\n");
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return 0;
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}
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if (!(hdl->mode & MIO_OUT)) {
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DPRINTF("mio_write: not output device\n");
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hdl->eof = 1;
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return 0;
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}
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if (len == 0) {
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DPRINTF("mio_write: zero length write ignored\n");
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return 0;
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}
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return hdl->ops->write(hdl, buf, len);
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}
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int
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mio_nfds(struct mio_hdl *hdl)
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{
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return 1;
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}
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int
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mio_pollfd(struct mio_hdl *hdl, struct pollfd *pfd, int events)
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{
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if (hdl->eof)
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return 0;
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return hdl->ops->pollfd(hdl, pfd, events);
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}
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int
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mio_revents(struct mio_hdl *hdl, struct pollfd *pfd)
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{
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if (hdl->eof)
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return POLLHUP;
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return hdl->ops->revents(hdl, pfd);
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}
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int
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mio_eof(struct mio_hdl *hdl)
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{
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return hdl->eof;
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}
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