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pulseaudio/src/modules/udev-util.c
Lennart Poettering 1552abf628 udev: fix hex decoding
2010-07-19 01:27:22 +02:00

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/***
This file is part of PulseAudio.
Copyright 2009 Lennart Poettering
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
PulseAudio 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 Lesser General Public
License along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <libudev.h>
#include <pulse/xmalloc.h>
#include <pulse/proplist.h>
#include <pulsecore/log.h>
#include <pulsecore/core-util.h>
#include "udev-util.h"
static int read_id(struct udev_device *d, const char *n) {
const char *v;
unsigned u;
pa_assert(d);
pa_assert(n);
if (!(v = udev_device_get_property_value(d, n)))
return -1;
if (pa_startswith(v, "0x"))
v += 2;
if (!*v)
return -1;
if (sscanf(v, "%04x", &u) != 1)
return -1;
if (u > 0xFFFFU)
return -1;
return u;
}
static int dehex(char x) {
if (x >= '0' && x <= '9')
return x - '0';
if (x >= 'A' && x <= 'F')
return x - 'A' + 10;
if (x >= 'a' && x <= 'f')
return x - 'a' + 10;
return -1;
}
static void proplist_sets_unescape(pa_proplist *p, const char *prop, const char *s) {
const char *f;
char *t, *r;
int c;
enum {
TEXT,
BACKSLASH,
EX,
FIRST
} state = TEXT;
/* The resulting string is definitely shorter than the source string */
r = pa_xnew(char, strlen(s)+1);
for (f = s, t = r; *f; f++) {
switch (state) {
case TEXT:
if (*f == '\\')
state = BACKSLASH;
else
*(t++) = *f;
break;
case BACKSLASH:
if (*f == 'x')
state = EX;
else {
*(t++) = '\\';
*(t++) = *f;
state = TEXT;
}
break;
case EX:
c = dehex(*f);
if (c < 0) {
*(t++) = '\\';
*(t++) = 'x';
*(t++) = *f;
state = TEXT;
} else
state = FIRST;
break;
case FIRST: {
int d = dehex(*f);
if (d < 0) {
*(t++) = '\\';
*(t++) = 'x';
*(t++) = *(f-1);
*(t++) = *f;
} else
*(t++) = (char) (c << 4) | d;
state = TEXT;
break;
}
}
}
switch (state) {
case TEXT:
break;
case BACKSLASH:
*(t++) = '\\';
break;
case EX:
*(t++) = '\\';
*(t++) = 'x';
break;
case FIRST:
*(t++) = '\\';
*(t++) = 'x';
*(t++) = *(f-1);
break;
}
*t = 0;
pa_proplist_sets(p, prop, r);
pa_xfree(r);
}
int pa_udev_get_info(int card_idx, pa_proplist *p) {
int r = -1;
struct udev *udev;
struct udev_device *card = NULL;
char *t;
const char *v;
int id;
pa_assert(p);
pa_assert(card_idx >= 0);
if (!(udev = udev_new())) {
pa_log_error("Failed to allocate udev context.");
goto finish;
}
t = pa_sprintf_malloc("%s/class/sound/card%i", udev_get_sys_path(udev), card_idx);
card = udev_device_new_from_syspath(udev, t);
pa_xfree(t);
if (!card) {
pa_log_error("Failed to get card object.");
goto finish;
}
if (!pa_proplist_contains(p, PA_PROP_DEVICE_BUS_PATH))
if (((v = udev_device_get_property_value(card, "ID_PATH")) && *v) ||
(v = udev_device_get_devpath(card)))
pa_proplist_sets(p, PA_PROP_DEVICE_BUS_PATH, v);
if (!pa_proplist_contains(p, "sysfs.path"))
if ((v = udev_device_get_devpath(card)))
pa_proplist_sets(p, "sysfs.path", v);
if (!pa_proplist_contains(p, "udev.id"))
if ((v = udev_device_get_property_value(card, "ID_ID")) && *v)
pa_proplist_sets(p, "udev.id", v);
if (!pa_proplist_contains(p, PA_PROP_DEVICE_BUS))
if ((v = udev_device_get_property_value(card, "ID_BUS")) && *v)
pa_proplist_sets(p, PA_PROP_DEVICE_BUS, v);
if (!pa_proplist_contains(p, PA_PROP_DEVICE_VENDOR_ID))
if ((id = read_id(card, "ID_VENDOR_ID")) > 0)
pa_proplist_setf(p, PA_PROP_DEVICE_VENDOR_ID, "%04x", id);
if (!pa_proplist_contains(p, PA_PROP_DEVICE_VENDOR_NAME)) {
if ((v = udev_device_get_property_value(card, "ID_VENDOR_FROM_DATABASE")) && *v)
pa_proplist_sets(p, PA_PROP_DEVICE_VENDOR_NAME, v);
else if ((v = udev_device_get_property_value(card, "ID_VENDOR_ENC")) && *v)
proplist_sets_unescape(p, PA_PROP_DEVICE_VENDOR_NAME, v);
else if ((v = udev_device_get_property_value(card, "ID_VENDOR")) && *v)
pa_proplist_sets(p, PA_PROP_DEVICE_VENDOR_NAME, v);
}
if (!pa_proplist_contains(p, PA_PROP_DEVICE_PRODUCT_ID))
if ((id = read_id(card, "ID_MODEL_ID")) >= 0)
pa_proplist_setf(p, PA_PROP_DEVICE_PRODUCT_ID, "%04x", id);
if (!pa_proplist_contains(p, PA_PROP_DEVICE_PRODUCT_NAME)) {
if ((v = udev_device_get_property_value(card, "ID_MODEL_FROM_DATABASE")) && *v)
pa_proplist_sets(p, PA_PROP_DEVICE_PRODUCT_NAME, v);
else if ((v = udev_device_get_property_value(card, "ID_MODEL_ENC")) && *v)
proplist_sets_unescape(p, PA_PROP_DEVICE_PRODUCT_NAME, v);
else if ((v = udev_device_get_property_value(card, "ID_MODEL")) && *v)
pa_proplist_sets(p, PA_PROP_DEVICE_PRODUCT_NAME, v);
}
if (!pa_proplist_contains(p, PA_PROP_DEVICE_SERIAL))
if ((v = udev_device_get_property_value(card, "ID_SERIAL")) && *v)
pa_proplist_sets(p, PA_PROP_DEVICE_SERIAL, v);
if (!pa_proplist_contains(p, PA_PROP_DEVICE_CLASS))
if ((v = udev_device_get_property_value(card, "SOUND_CLASS")) && *v)
pa_proplist_sets(p, PA_PROP_DEVICE_CLASS, v);
if (!pa_proplist_contains(p, PA_PROP_DEVICE_FORM_FACTOR))
if ((v = udev_device_get_property_value(card, "SOUND_FORM_FACTOR")) && *v)
pa_proplist_sets(p, PA_PROP_DEVICE_FORM_FACTOR, v);
/* This is normaly not set by the udev rules but may be useful to
* allow administrators to overwrite the device description.*/
if (!pa_proplist_contains(p, PA_PROP_DEVICE_DESCRIPTION))
if ((v = udev_device_get_property_value(card, "SOUND_DESCRIPTION")) && *v)
pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, v);
r = 0;
finish:
if (card)
udev_device_unref(card);
if (udev)
udev_unref(udev);
return r;
}
char* pa_udev_get_property(int card_idx, const char *name) {
struct udev *udev;
struct udev_device *card = NULL;
char *t, *r = NULL;
const char *v;
pa_assert(card_idx >= 0);
pa_assert(name);
if (!(udev = udev_new())) {
pa_log_error("Failed to allocate udev context.");
goto finish;
}
t = pa_sprintf_malloc("%s/class/sound/card%i", udev_get_sys_path(udev), card_idx);
card = udev_device_new_from_syspath(udev, t);
pa_xfree(t);
if (!card) {
pa_log_error("Failed to get card object.");
goto finish;
}
if ((v = udev_device_get_property_value(card, name)) && *v)
r = pa_xstrdup(v);
finish:
if (card)
udev_device_unref(card);
if (udev)
udev_unref(udev);
return r;
}
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