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/*
* shl - Flagset
*
* Copyright (c) 2013 David Herrmann <dh.herrmann@googlemail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* A dynamic flagset implementation
*/
#ifndef SHL_FLAGSET_H
#define SHL_FLAGSET_H
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include "shl_array.h"
#include "shl_misc.h"
static inline int shl_flagset_new(struct shl_array **out)
{
return shl_array_new(out, sizeof(unsigned long), 1);
}
static inline void shl_flagset_free(struct shl_array *arr)
{
return shl_array_free(arr);
}
static inline int shl_flagset_alloc(struct shl_array *arr, unsigned int *out)
{
static const unsigned long one = 1;
unsigned int i, j;
unsigned long *data;
int ret;
if (!arr)
return -EINVAL;
for (i = 0; i < arr->length; ++i) {
data = SHL_ARRAY_AT(arr, unsigned long, i);
for (j = 0; j < SHL_ULONG_BITS; ++j) {
if (!(*data & (1UL << j))) {
*data |= 1UL << j;
*out = i * SHL_ULONG_BITS + j;
return 0;
}
}
}
ret = shl_array_push(arr, &one);
if (ret)
return ret;
*out = (arr->length - 1) * SHL_ULONG_BITS;
return 0;
}
static inline int shl_flagset_reserve(struct shl_array *arr, unsigned int num)
{
int ret;
unsigned int idx, off;
unsigned long *data;
if (!arr)
return -EINVAL;
idx = num / SHL_ULONG_BITS;
off = num % SHL_ULONG_BITS;
if (idx >= arr->length) {
ret = shl_array_zresize(arr, idx + 1);
if (ret)
return ret;
}
data = SHL_ARRAY_AT(arr, unsigned long, idx);
if (*data & (1UL << off))
return -EEXIST;
*data |= 1UL << off;
return 0;
}
static inline int shl_flagset_set(struct shl_array *arr, unsigned int num)
{
int ret;
ret = shl_flagset_reserve(arr, num);
if (ret == -EEXIST)
return 0;
return ret;
}
static inline void shl_flagset_unset(struct shl_array *arr, unsigned int num)
{
unsigned int idx, off;
unsigned long *data;
if (!arr)
return;
idx = num / SHL_ULONG_BITS;
off = num % SHL_ULONG_BITS;
if (idx >= arr->length)
return;
data = SHL_ARRAY_AT(arr, unsigned long, idx);
*data &= ~(1UL << off);
}
#endif /* SHL_FLAGSET_H */
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