thodg/libgit2/src/vector.h

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• Hash : 0bd43371
  Author :
  Date : 2016-09-23T12:42:33
  

  vector, pqueue: add git_vector_reverse and git_pqueue_reverse This is a convenience function to reverse the contents of a vector and a pqueue in-place. The pqueue function is useful in the case where we're treating it as a LIFO queue.

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• src/vector.h

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  #ifndef INCLUDE_vector_h__
  #define INCLUDE_vector_h__
  
  #include "common.h"
  
  typedef int (*git_vector_cmp)(const void *, const void *);
  
  enum {
  	GIT_VECTOR_SORTED = (1u << 0),
  	GIT_VECTOR_FLAG_MAX = (1u << 1),
  };
  
  typedef struct git_vector {
  	size_t _alloc_size;
  	git_vector_cmp _cmp;
  	void **contents;
  	size_t length;
  	uint32_t flags;
  } git_vector;
  
  #define GIT_VECTOR_INIT {0}
  
  int git_vector_init(git_vector *v, size_t initial_size, git_vector_cmp cmp);
  void git_vector_free(git_vector *v);
  void git_vector_free_deep(git_vector *v); /* free each entry and self */
  void git_vector_clear(git_vector *v);
  int git_vector_dup(git_vector *v, const git_vector *src, git_vector_cmp cmp);
  void git_vector_swap(git_vector *a, git_vector *b);
  int git_vector_size_hint(git_vector *v, size_t size_hint);
  
  void **git_vector_detach(size_t *size, size_t *asize, git_vector *v);
  
  void git_vector_sort(git_vector *v);
  
  /** Linear search for matching entry using internal comparison function */
  int git_vector_search(size_t *at_pos, const git_vector *v, const void *entry);
  
  /** Linear search for matching entry using explicit comparison function */
  int git_vector_search2(size_t *at_pos, const git_vector *v, git_vector_cmp cmp, const void *key);
  
  /**
   * Binary search for matching entry using explicit comparison function that
   * returns position where item would go if not found.
   */
  int git_vector_bsearch2(
  	size_t *at_pos, git_vector *v, git_vector_cmp cmp, const void *key);
  
  /** Binary search for matching entry using internal comparison function */
  GIT_INLINE(int) git_vector_bsearch(size_t *at_pos, git_vector *v, const void *key)
  {
  	return git_vector_bsearch2(at_pos, v, v->_cmp, key);
  }
  
  GIT_INLINE(void *) git_vector_get(const git_vector *v, size_t position)
  {
  	return (position < v->length) ? v->contents[position] : NULL;
  }
  
  #define GIT_VECTOR_GET(V,I) ((I) < (V)->length ? (V)->contents[(I)] : NULL)
  
  GIT_INLINE(size_t) git_vector_length(const git_vector *v)
  {
  	return v->length;
  }
  
  GIT_INLINE(void *) git_vector_last(const git_vector *v)
  {
  	return (v->length > 0) ? git_vector_get(v, v->length - 1) : NULL;
  }
  
  #define git_vector_foreach(v, iter, elem)	\
  	for ((iter) = 0; (iter) < (v)->length && ((elem) = (v)->contents[(iter)], 1); (iter)++ )
  
  #define git_vector_rforeach(v, iter, elem)	\
  	for ((iter) = (v)->length - 1; (iter) < SIZE_MAX && ((elem) = (v)->contents[(iter)], 1); (iter)-- )
  
  int git_vector_insert(git_vector *v, void *element);
  int git_vector_insert_sorted(git_vector *v, void *element,
  	int (*on_dup)(void **old, void *new));
  int git_vector_remove(git_vector *v, size_t idx);
  void git_vector_pop(git_vector *v);
  void git_vector_uniq(git_vector *v, void  (*git_free_cb)(void *));
  
  void git_vector_remove_matching(
  	git_vector *v,
  	int (*match)(const git_vector *v, size_t idx, void *payload),
  	void *payload);
  
  int git_vector_resize_to(git_vector *v, size_t new_length);
  int git_vector_insert_null(git_vector *v, size_t idx, size_t insert_len);
  int git_vector_remove_range(git_vector *v, size_t idx, size_t remove_len);
  
  int git_vector_set(void **old, git_vector *v, size_t position, void *value);
  
  /** Check if vector is sorted */
  #define git_vector_is_sorted(V) (((V)->flags & GIT_VECTOR_SORTED) != 0)
  
  /** Directly set sorted state of vector */
  #define git_vector_set_sorted(V,S) do { \
  	(V)->flags = (S) ? ((V)->flags | GIT_VECTOR_SORTED) : \
  		((V)->flags & ~GIT_VECTOR_SORTED); } while (0)
  
  /** Set the comparison function used for sorting the vector */
  GIT_INLINE(void) git_vector_set_cmp(git_vector *v, git_vector_cmp cmp)
  {
  	if (cmp != v->_cmp) {
  		v->_cmp = cmp;
  		git_vector_set_sorted(v, 0);
  	}
  }
  
  /* Just use this in tests, not for realz. returns -1 if not sorted */
  int git_vector_verify_sorted(const git_vector *v);
  
  /**
   * Reverse the vector in-place.
   */
  void git_vector_reverse(git_vector *v);
  
  #endif
  

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