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44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef LABWC_ARRAY_H
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#define LABWC_ARRAY_H
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#include <wayland-server-core.h>
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/*
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* Wayland's wl_array API is a bit sparse consisting only of
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* - init
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* - release
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* - add
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* - copy
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* - for_each
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*
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* The purpose of this header is the gather any generic wl_array helpers we
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* create.
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*
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* We take the liberty of using the wl_ suffix here to make it look a bit
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* prettier. If Wayland extend the API in future, we will sort the clash then.
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*/
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/**
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* wl_array_len() - return length of wl_array
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* @array: wl_array for which to calculate length
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* Note: The pointer type might not be 'char' but this is the approach that
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* wl_array_for_each() takes, so we align with their style.
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*/
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static inline size_t
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wl_array_len(struct wl_array *array)
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{
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return array->size / sizeof(const char *);
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}
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/**
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* Iterates in reverse over an array.
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* @pos: pointer that each array element will be assigned to
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* @array: wl_array to iterate over
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*/
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#define wl_array_for_each_reverse(pos, array) \
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for (pos = !(array)->data ? NULL \
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: (void *)((const char *)(array)->data + (array)->size - sizeof(pos)); \
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pos && (const char *)pos >= (const char *)(array)->data; \
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(pos)--)
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#endif /* LABWC_ARRAY_H */
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