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522 lines
18 KiB
C
522 lines
18 KiB
C
/* Type-safe arrays which grow dynamically.
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Copyright (C) 2017-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* Pre-processor macros which act as parameters:
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DYNARRAY_STRUCT
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The struct tag of dynamic array to be defined.
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DYNARRAY_ELEMENT
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The type name of the element type. Elements are copied
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as if by memcpy, and can change address as the dynamic
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array grows.
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DYNARRAY_PREFIX
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The prefix of the functions which are defined.
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The following parameters are optional:
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DYNARRAY_ELEMENT_FREE
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DYNARRAY_ELEMENT_FREE (E) is evaluated to deallocate the
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contents of elements. E is of type DYNARRAY_ELEMENT *.
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DYNARRAY_ELEMENT_INIT
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DYNARRAY_ELEMENT_INIT (E) is evaluated to initialize a new
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element. E is of type DYNARRAY_ELEMENT *.
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If DYNARRAY_ELEMENT_FREE but not DYNARRAY_ELEMENT_INIT is
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defined, new elements are automatically zero-initialized.
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Otherwise, new elements have undefined contents.
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DYNARRAY_INITIAL_SIZE
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The size of the statically allocated array (default:
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at least 2, more elements if they fit into 128 bytes).
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Must be a preprocessor constant. If DYNARRAY_INITIAL_SIZE is 0,
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there is no statically allocated array at, and all non-empty
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arrays are heap-allocated.
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DYNARRAY_FINAL_TYPE
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The name of the type which holds the final array. If not
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defined, is PREFIX##finalize not provided. DYNARRAY_FINAL_TYPE
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must be a struct type, with members of type DYNARRAY_ELEMENT and
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size_t at the start (in this order).
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These macros are undefined after this header file has been
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included.
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The following types are provided (their members are private to the
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dynarray implementation):
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struct DYNARRAY_STRUCT
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The following functions are provided:
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void DYNARRAY_PREFIX##init (struct DYNARRAY_STRUCT *);
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void DYNARRAY_PREFIX##free (struct DYNARRAY_STRUCT *);
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bool DYNARRAY_PREFIX##has_failed (const struct DYNARRAY_STRUCT *);
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void DYNARRAY_PREFIX##mark_failed (struct DYNARRAY_STRUCT *);
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size_t DYNARRAY_PREFIX##size (const struct DYNARRAY_STRUCT *);
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DYNARRAY_ELEMENT *DYNARRAY_PREFIX##begin (const struct DYNARRAY_STRUCT *);
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DYNARRAY_ELEMENT *DYNARRAY_PREFIX##end (const struct DYNARRAY_STRUCT *);
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DYNARRAY_ELEMENT *DYNARRAY_PREFIX##at (struct DYNARRAY_STRUCT *, size_t);
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void DYNARRAY_PREFIX##add (struct DYNARRAY_STRUCT *, DYNARRAY_ELEMENT);
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DYNARRAY_ELEMENT *DYNARRAY_PREFIX##emplace (struct DYNARRAY_STRUCT *);
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bool DYNARRAY_PREFIX##resize (struct DYNARRAY_STRUCT *, size_t);
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void DYNARRAY_PREFIX##remove_last (struct DYNARRAY_STRUCT *);
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void DYNARRAY_PREFIX##clear (struct DYNARRAY_STRUCT *);
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The following functions are provided are provided if the
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prerequisites are met:
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bool DYNARRAY_PREFIX##finalize (struct DYNARRAY_STRUCT *,
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DYNARRAY_FINAL_TYPE *);
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(if DYNARRAY_FINAL_TYPE is defined)
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DYNARRAY_ELEMENT *DYNARRAY_PREFIX##finalize (struct DYNARRAY_STRUCT *,
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size_t *);
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(if DYNARRAY_FINAL_TYPE is not defined)
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*/
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#include <malloc/dynarray.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#ifndef DYNARRAY_STRUCT
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# error "DYNARRAY_STRUCT must be defined"
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#endif
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#ifndef DYNARRAY_ELEMENT
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# error "DYNARRAY_ELEMENT must be defined"
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#endif
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#ifndef DYNARRAY_PREFIX
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# error "DYNARRAY_PREFIX must be defined"
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#endif
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#ifdef DYNARRAY_INITIAL_SIZE
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# if DYNARRAY_INITIAL_SIZE < 0
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# error "DYNARRAY_INITIAL_SIZE must be non-negative"
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# endif
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# if DYNARRAY_INITIAL_SIZE > 0
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# define DYNARRAY_HAVE_SCRATCH 1
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# else
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# define DYNARRAY_HAVE_SCRATCH 0
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# endif
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#else
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/* Provide a reasonable default which limits the size of
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DYNARRAY_STRUCT. */
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# define DYNARRAY_INITIAL_SIZE \
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(sizeof (DYNARRAY_ELEMENT) > 64 ? 2 : 128 / sizeof (DYNARRAY_ELEMENT))
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# define DYNARRAY_HAVE_SCRATCH 1
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#endif
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/* Public type definitions. */
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/* All fields of this struct are private to the implementation. */
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struct DYNARRAY_STRUCT
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{
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union
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{
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struct dynarray_header dynarray_abstract;
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struct
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{
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/* These fields must match struct dynarray_header. */
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size_t used;
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size_t allocated;
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DYNARRAY_ELEMENT *array;
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} dynarray_header;
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};
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#if DYNARRAY_HAVE_SCRATCH
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/* Initial inline allocation. */
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DYNARRAY_ELEMENT scratch[DYNARRAY_INITIAL_SIZE];
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#endif
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};
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/* Internal use only: Helper macros. */
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/* Ensure macro-expansion of DYNARRAY_PREFIX. */
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#define DYNARRAY_CONCAT0(prefix, name) prefix##name
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#define DYNARRAY_CONCAT1(prefix, name) DYNARRAY_CONCAT0(prefix, name)
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#define DYNARRAY_NAME(name) DYNARRAY_CONCAT1(DYNARRAY_PREFIX, name)
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/* Address of the scratch buffer if any. */
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#if DYNARRAY_HAVE_SCRATCH
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# define DYNARRAY_SCRATCH(list) (list)->scratch
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#else
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# define DYNARRAY_SCRATCH(list) NULL
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#endif
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/* Internal use only: Helper functions. */
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/* Internal function. Call DYNARRAY_ELEMENT_FREE with the array
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elements. Name mangling needed due to the DYNARRAY_ELEMENT_FREE
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macro expansion. */
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static inline void
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DYNARRAY_NAME (free__elements__) (DYNARRAY_ELEMENT *__dynarray_array,
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size_t __dynarray_used)
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{
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#ifdef DYNARRAY_ELEMENT_FREE
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for (size_t __dynarray_i = 0; __dynarray_i < __dynarray_used; ++__dynarray_i)
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DYNARRAY_ELEMENT_FREE (&__dynarray_array[__dynarray_i]);
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#endif /* DYNARRAY_ELEMENT_FREE */
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}
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/* Internal function. Free the non-scratch array allocation. */
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static inline void
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DYNARRAY_NAME (free__array__) (struct DYNARRAY_STRUCT *list)
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{
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#if DYNARRAY_HAVE_SCRATCH
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if (list->dynarray_header.array != list->scratch)
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free (list->dynarray_header.array);
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#else
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free (list->dynarray_header.array);
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#endif
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}
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/* Public functions. */
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/* Initialize a dynamic array object. This must be called before any
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use of the object. */
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__attribute__ ((nonnull (1)))
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static void
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DYNARRAY_NAME (init) (struct DYNARRAY_STRUCT *list)
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{
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list->dynarray_header.used = 0;
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list->dynarray_header.allocated = DYNARRAY_INITIAL_SIZE;
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list->dynarray_header.array = DYNARRAY_SCRATCH (list);
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}
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/* Deallocate the dynamic array and its elements. */
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__attribute__ ((unused, nonnull (1)))
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static void
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DYNARRAY_NAME (free) (struct DYNARRAY_STRUCT *list)
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{
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DYNARRAY_NAME (free__elements__)
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(list->dynarray_header.array, list->dynarray_header.used);
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DYNARRAY_NAME (free__array__) (list);
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DYNARRAY_NAME (init) (list);
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}
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/* Return true if the dynamic array is in an error state. */
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__attribute__ ((nonnull (1)))
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static inline bool
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DYNARRAY_NAME (has_failed) (const struct DYNARRAY_STRUCT *list)
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{
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return list->dynarray_header.allocated == __dynarray_error_marker ();
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}
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/* Mark the dynamic array as failed. All elements are deallocated as
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a side effect. */
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__attribute__ ((nonnull (1)))
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static void
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DYNARRAY_NAME (mark_failed) (struct DYNARRAY_STRUCT *list)
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{
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DYNARRAY_NAME (free__elements__)
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(list->dynarray_header.array, list->dynarray_header.used);
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DYNARRAY_NAME (free__array__) (list);
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list->dynarray_header.array = DYNARRAY_SCRATCH (list);
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list->dynarray_header.used = 0;
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list->dynarray_header.allocated = __dynarray_error_marker ();
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}
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/* Return the number of elements which have been added to the dynamic
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array. */
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__attribute__ ((nonnull (1)))
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static inline size_t
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DYNARRAY_NAME (size) (const struct DYNARRAY_STRUCT *list)
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{
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return list->dynarray_header.used;
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}
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/* Return a pointer to the array element at INDEX. Terminate the
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process if INDEX is out of bounds. */
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__attribute__ ((nonnull (1)))
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static inline DYNARRAY_ELEMENT *
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DYNARRAY_NAME (at) (struct DYNARRAY_STRUCT *list, size_t index)
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{
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if (__glibc_unlikely (index >= DYNARRAY_NAME (size) (list)))
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__libc_dynarray_at_failure (DYNARRAY_NAME (size) (list), index);
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return list->dynarray_header.array + index;
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}
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/* Return a pointer to the first array element, if any. For a
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zero-length array, the pointer can be NULL even though the dynamic
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array has not entered the failure state. */
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__attribute__ ((nonnull (1)))
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static inline DYNARRAY_ELEMENT *
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DYNARRAY_NAME (begin) (struct DYNARRAY_STRUCT *list)
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{
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return list->dynarray_header.array;
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}
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/* Return a pointer one element past the last array element. For a
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zero-length array, the pointer can be NULL even though the dynamic
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array has not entered the failure state. */
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__attribute__ ((nonnull (1)))
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static inline DYNARRAY_ELEMENT *
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DYNARRAY_NAME (end) (struct DYNARRAY_STRUCT *list)
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{
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return list->dynarray_header.array + list->dynarray_header.used;
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}
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/* Internal function. Slow path for the add function below. */
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static void
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DYNARRAY_NAME (add__) (struct DYNARRAY_STRUCT *list, DYNARRAY_ELEMENT item)
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{
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if (__glibc_unlikely
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(!__libc_dynarray_emplace_enlarge (&list->dynarray_abstract,
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DYNARRAY_SCRATCH (list),
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sizeof (DYNARRAY_ELEMENT))))
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{
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DYNARRAY_NAME (mark_failed) (list);
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return;
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}
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/* Copy the new element and increase the array length. */
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list->dynarray_header.array[list->dynarray_header.used++] = item;
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}
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/* Add ITEM at the end of the array, enlarging it by one element.
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Mark *LIST as failed if the dynamic array allocation size cannot be
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increased. */
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__attribute__ ((unused, nonnull (1)))
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static inline void
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DYNARRAY_NAME (add) (struct DYNARRAY_STRUCT *list, DYNARRAY_ELEMENT item)
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{
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/* Do nothing in case of previous error. */
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if (DYNARRAY_NAME (has_failed) (list))
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return;
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/* Enlarge the array if necessary. */
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if (__glibc_unlikely (list->dynarray_header.used
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== list->dynarray_header.allocated))
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{
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DYNARRAY_NAME (add__) (list, item);
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return;
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}
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/* Copy the new element and increase the array length. */
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list->dynarray_header.array[list->dynarray_header.used++] = item;
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}
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/* Internal function. Building block for the emplace functions below.
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Assumes space for one more element in *LIST. */
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static inline DYNARRAY_ELEMENT *
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DYNARRAY_NAME (emplace__tail__) (struct DYNARRAY_STRUCT *list)
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{
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DYNARRAY_ELEMENT *result
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= &list->dynarray_header.array[list->dynarray_header.used];
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++list->dynarray_header.used;
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#if defined (DYNARRAY_ELEMENT_INIT)
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DYNARRAY_ELEMENT_INIT (result);
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#elif defined (DYNARRAY_ELEMENT_FREE)
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memset (result, 0, sizeof (*result));
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#endif
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return result;
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}
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/* Internal function. Slow path for the emplace function below. */
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static DYNARRAY_ELEMENT *
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DYNARRAY_NAME (emplace__) (struct DYNARRAY_STRUCT *list)
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{
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if (__glibc_unlikely
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(!__libc_dynarray_emplace_enlarge (&list->dynarray_abstract,
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DYNARRAY_SCRATCH (list),
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sizeof (DYNARRAY_ELEMENT))))
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{
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DYNARRAY_NAME (mark_failed) (list);
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return NULL;
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}
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return DYNARRAY_NAME (emplace__tail__) (list);
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}
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/* Allocate a place for a new element in *LIST and return a pointer to
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it. The pointer can be NULL if the dynamic array cannot be
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enlarged due to a memory allocation failure. */
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__attribute__ ((unused, warn_unused_result, nonnull (1)))
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static
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/* Avoid inlining with the larger initialization code. */
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#if !(defined (DYNARRAY_ELEMENT_INIT) || defined (DYNARRAY_ELEMENT_FREE))
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inline
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#endif
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DYNARRAY_ELEMENT *
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DYNARRAY_NAME (emplace) (struct DYNARRAY_STRUCT *list)
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{
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/* Do nothing in case of previous error. */
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if (DYNARRAY_NAME (has_failed) (list))
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return NULL;
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/* Enlarge the array if necessary. */
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if (__glibc_unlikely (list->dynarray_header.used
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== list->dynarray_header.allocated))
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return (DYNARRAY_NAME (emplace__) (list));
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return DYNARRAY_NAME (emplace__tail__) (list);
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}
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/* Change the size of *LIST to SIZE. If SIZE is larger than the
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existing size, new elements are added (which can be initialized).
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Otherwise, the list is truncated, and elements are freed. Return
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false on memory allocation failure (and mark *LIST as failed). */
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__attribute__ ((unused, nonnull (1)))
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static bool
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DYNARRAY_NAME (resize) (struct DYNARRAY_STRUCT *list, size_t size)
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{
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if (size > list->dynarray_header.used)
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{
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bool ok;
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#if defined (DYNARRAY_ELEMENT_INIT)
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/* The new elements have to be initialized. */
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size_t old_size = list->dynarray_header.used;
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ok = __libc_dynarray_resize (&list->dynarray_abstract,
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size, DYNARRAY_SCRATCH (list),
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sizeof (DYNARRAY_ELEMENT));
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if (ok)
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for (size_t i = old_size; i < size; ++i)
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{
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DYNARRAY_ELEMENT_INIT (&list->dynarray_header.array[i]);
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}
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#elif defined (DYNARRAY_ELEMENT_FREE)
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/* Zero initialization is needed so that the elements can be
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safely freed. */
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ok = __libc_dynarray_resize_clear
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(&list->dynarray_abstract, size,
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DYNARRAY_SCRATCH (list), sizeof (DYNARRAY_ELEMENT));
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#else
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ok = __libc_dynarray_resize (&list->dynarray_abstract,
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size, DYNARRAY_SCRATCH (list),
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sizeof (DYNARRAY_ELEMENT));
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#endif
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if (__glibc_unlikely (!ok))
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DYNARRAY_NAME (mark_failed) (list);
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return ok;
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}
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else
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{
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/* The list has shrunk in size. Free the removed elements. */
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DYNARRAY_NAME (free__elements__)
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(list->dynarray_header.array + size,
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list->dynarray_header.used - size);
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list->dynarray_header.used = size;
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return true;
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}
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}
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/* Remove the last element of LIST if it is present. */
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__attribute__ ((unused, nonnull (1)))
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static void
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DYNARRAY_NAME (remove_last) (struct DYNARRAY_STRUCT *list)
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{
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/* used > 0 implies that the array is the non-failed state. */
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if (list->dynarray_header.used > 0)
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{
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size_t new_length = list->dynarray_header.used - 1;
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#ifdef DYNARRAY_ELEMENT_FREE
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DYNARRAY_ELEMENT_FREE (&list->dynarray_header.array[new_length]);
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#endif
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list->dynarray_header.used = new_length;
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}
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}
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/* Remove all elements from the list. The elements are freed, but the
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list itself is not. */
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__attribute__ ((unused, nonnull (1)))
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static void
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DYNARRAY_NAME (clear) (struct DYNARRAY_STRUCT *list)
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{
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/* free__elements__ does nothing if the list is in the failed
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state. */
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DYNARRAY_NAME (free__elements__)
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(list->dynarray_header.array, list->dynarray_header.used);
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list->dynarray_header.used = 0;
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}
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#ifdef DYNARRAY_FINAL_TYPE
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/* Transfer the dynamic array to a permanent location at *RESULT.
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Returns true on success on false on allocation failure. In either
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case, *LIST is re-initialized and can be reused. A NULL pointer is
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stored in *RESULT if LIST refers to an empty list. On success, the
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pointer in *RESULT is heap-allocated and must be deallocated using
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free. */
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__attribute__ ((unused, warn_unused_result, nonnull (1, 2)))
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static bool
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DYNARRAY_NAME (finalize) (struct DYNARRAY_STRUCT *list,
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DYNARRAY_FINAL_TYPE *result)
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{
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struct dynarray_finalize_result res;
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if (__libc_dynarray_finalize (&list->dynarray_abstract,
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DYNARRAY_SCRATCH (list),
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sizeof (DYNARRAY_ELEMENT), &res))
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{
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/* On success, the result owns all the data. */
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DYNARRAY_NAME (init) (list);
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*result = (DYNARRAY_FINAL_TYPE) { res.array, res.length };
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return true;
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}
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else
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{
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/* On error, we need to free all data. */
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DYNARRAY_NAME (free) (list);
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errno = ENOMEM;
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return false;
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}
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}
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#else /* !DYNARRAY_FINAL_TYPE */
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/* Transfer the dynamic array to a heap-allocated array and return a
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pointer to it. The pointer is NULL if memory allocation fails, or
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if the array is empty, so this function should be used only for
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|
arrays which are known not be empty (usually because they always
|
|
have a sentinel at the end). If LENGTHP is not NULL, the array
|
|
length is written to *LENGTHP. *LIST is re-initialized and can be
|
|
reused. */
|
|
__attribute__ ((unused, warn_unused_result, nonnull (1)))
|
|
static DYNARRAY_ELEMENT *
|
|
DYNARRAY_NAME (finalize) (struct DYNARRAY_STRUCT *list, size_t *lengthp)
|
|
{
|
|
struct dynarray_finalize_result res;
|
|
if (__libc_dynarray_finalize (&list->dynarray_abstract,
|
|
DYNARRAY_SCRATCH (list),
|
|
sizeof (DYNARRAY_ELEMENT), &res))
|
|
{
|
|
/* On success, the result owns all the data. */
|
|
DYNARRAY_NAME (init) (list);
|
|
if (lengthp != NULL)
|
|
*lengthp = res.length;
|
|
return res.array;
|
|
}
|
|
else
|
|
{
|
|
/* On error, we need to free all data. */
|
|
DYNARRAY_NAME (free) (list);
|
|
errno = ENOMEM;
|
|
return NULL;
|
|
}
|
|
}
|
|
#endif /* !DYNARRAY_FINAL_TYPE */
|
|
|
|
/* Undo macro definitions. */
|
|
|
|
#undef DYNARRAY_CONCAT0
|
|
#undef DYNARRAY_CONCAT1
|
|
#undef DYNARRAY_NAME
|
|
#undef DYNARRAY_SCRATCH
|
|
#undef DYNARRAY_HAVE_SCRATCH
|
|
|
|
#undef DYNARRAY_STRUCT
|
|
#undef DYNARRAY_ELEMENT
|
|
#undef DYNARRAY_PREFIX
|
|
#undef DYNARRAY_ELEMENT_FREE
|
|
#undef DYNARRAY_ELEMENT_INIT
|
|
#undef DYNARRAY_INITIAL_SIZE
|
|
#undef DYNARRAY_FINAL_TYPE
|