70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "stdlib/ndarray/base/ind.h"
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#include "stdlib/ndarray/index_modes.h"
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#include "stdlib/ndarray/base/wrap_index.h"
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#include "stdlib/ndarray/base/clamp_index.h"
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#include <stdint.h>
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/**
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* Returns an index given an index mode.
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*
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* ## Notes
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*
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* - The function returns `-1` if an index is out-of-bounds.
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*
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* @param idx index
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* @param max maximum index (should be nonnegative)
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* @param mode index mode specifying how to handle an index outside the interval `[0,max]`
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* @return index
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*
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* @example
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* #include "stdlib/ndarray/index_modes.h"
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* #include "stdlib/ndarray/base/ind.h"
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*
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* int64_t idx = stdlib_ndarray_ind( 10, 8, STDLIB_NDARRAY_INDEX_CLAMP );
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* // returns 8
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*
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* @example
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* #include "stdlib/ndarray/index_modes.h"
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* #include "stdlib/ndarray/base/ind.h"
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*
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* int64_t idx = stdlib_ndarray_ind( 13, 10, STDLIB_NDARRAY_INDEX_WRAP );
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* // returns 2
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*
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* @example
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* #include "stdlib/ndarray/index_modes.h"
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* #include "stdlib/ndarray/base/ind.h"
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*
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* int64_t idx = stdlib_ndarray_ind( 10, 8, STDLIB_NDARRAY_INDEX_ERROR );
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* // returns -1
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*/
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int64_t stdlib_ndarray_ind( const int64_t idx, const int64_t max, const enum STDLIB_NDARRAY_INDEX_MODE mode ) {
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if ( mode == STDLIB_NDARRAY_INDEX_CLAMP ) {
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return stdlib_ndarray_clamp_index( idx, max );
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}
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if ( mode == STDLIB_NDARRAY_INDEX_WRAP ) {
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return stdlib_ndarray_wrap_index( idx, max );
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}
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if ( idx < 0 || idx > max ) {
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return -1; // out-of-bounds
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}
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return idx;
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}
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