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/*
* Copyright © 2013 David Herrmann <dh.herrmann@gmail.com>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, 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 <config.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "libevdev.h"
#include "libevdev-int.h"
#include "libevdev-util.h"
#include "event-names.h"
struct name_lookup {
const char *name;
size_t len;
};
static int cmp_entry(const void *vlookup, const void *ventry)
{
const struct name_lookup *lookup = vlookup;
const struct name_entry *entry = ventry;
int r;
r = strncmp(lookup->name, entry->name, lookup->len);
if (!r) {
if (entry->name[lookup->len])
r = -1;
else
r = 0;
}
return r;
}
static const struct name_entry*
lookup_name(const struct name_entry *array, size_t asize,
struct name_lookup *lookup)
{
const struct name_entry *entry;
entry = bsearch(lookup, array, asize, sizeof(*array), cmp_entry);
if (!entry)
return NULL;
return entry;
}
LIBEVDEV_EXPORT int
libevdev_event_type_from_name(const char *name)
{
return libevdev_event_type_from_name_n(name, strlen(name));
}
LIBEVDEV_EXPORT int
libevdev_event_type_from_name_n(const char *name, size_t len)
{
struct name_lookup lookup;
const struct name_entry *entry;
lookup.name = name;
lookup.len = len;
entry = lookup_name(ev_names, ARRAY_LENGTH(ev_names), &lookup);
return entry ? (int)entry->value : -1;
}
static int type_from_prefix(const char *name, ssize_t len)
{
const char *e;
size_t i;
ssize_t l;
/* MAX_ is not allowed, even though EV_MAX exists */
if (startswith(name, len, "MAX_", 4))
return -1;
/* BTN_ is special as there is no EV_BTN type */
if (startswith(name, len, "BTN_", 4))
return EV_KEY;
/* FF_STATUS_ is special as FF_ is a prefix of it, so test it first */
if (startswith(name, len, "FF_STATUS_", 10))
return EV_FF_STATUS;
for (i = 0; i < ARRAY_LENGTH(ev_names); ++i) {
/* skip EV_ prefix so @e is suffix of [EV_]XYZ */
e = &ev_names[i].name[3];
l = strlen(e);
/* compare prefix and test for trailing _ */
if (len > l && startswith(name, len, e, l) && name[l] == '_')
return ev_names[i].value;
}
return -1;
}
LIBEVDEV_EXPORT int
libevdev_event_code_from_name(unsigned int type, const char *name)
{
return libevdev_event_code_from_name_n(type, name, strlen(name));
}
LIBEVDEV_EXPORT int
libevdev_event_code_from_name_n(unsigned int type, const char *name, size_t len)
{
struct name_lookup lookup;
const struct name_entry *entry;
int real_type;
/* verify that @name is really of type @type */
real_type = type_from_prefix(name, len);
if (real_type < 0 || (unsigned int)real_type != type)
return -1;
/* now look up the name @name and return the constant */
lookup.name = name;
lookup.len = len;
entry = lookup_name(code_names, ARRAY_LENGTH(code_names), &lookup);
return entry ? (int)entry->value : -1;
}
LIBEVDEV_EXPORT int
libevdev_property_from_name(const char *name)
{
return libevdev_property_from_name_n(name, strlen(name));
}
LIBEVDEV_EXPORT int
libevdev_property_from_name_n(const char *name, size_t len)
{
struct name_lookup lookup;
const struct name_entry *entry;
lookup.name = name;
lookup.len = len;
entry = lookup_name(prop_names, ARRAY_LENGTH(prop_names), &lookup);
return entry ? (int)entry->value : -1;
}
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