thodg/libgit2/src/vector.c

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• Hash : 74fa4bfa
  Author :
  Date : 2012-02-28T16:14:47
  

  Update diff to use iterators This is a major reorganization of the diff code. This changes the diff functions to use the iterators for traversing the content. This allowed a lot of code to be simplified. Also, this moved the functions relating to outputting a diff into a new file (diff_output.c). This includes a number of other changes - adding utility functions, extending iterators, etc. plus more tests for the diff code. This also takes the example diff.c program much further in terms of emulating git-diff command line options.

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• src/vector.c

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "common.h"
  #include "repository.h"
  #include "vector.h"
  
  static const double resize_factor = 1.75;
  static const size_t minimum_size = 8;
  
  static int resize_vector(git_vector *v)
  {
  	v->_alloc_size = ((unsigned int)(v->_alloc_size * resize_factor)) + 1;
  	if (v->_alloc_size < minimum_size)
  		v->_alloc_size = minimum_size;
  
  	v->contents = git__realloc(v->contents, v->_alloc_size * sizeof(void *));
  	if (v->contents == NULL)
  		return GIT_ENOMEM;
  
  	return GIT_SUCCESS;
  }
  
  void git_vector_free(git_vector *v)
  {
  	assert(v);
  
  	git__free(v->contents);
  	v->contents = NULL;
  
  	v->length = 0;
  	v->_alloc_size = 0;
  }
  
  int git_vector_init(git_vector *v, unsigned int initial_size, git_vector_cmp cmp)
  {
  	assert(v);
  
  	memset(v, 0x0, sizeof(git_vector));
  
  	if (initial_size == 0)
  		initial_size = minimum_size;
  
  	v->_alloc_size = initial_size;
  	v->_cmp = cmp;
  
  	v->length = 0;
  	v->sorted = 1;
  
  	v->contents = git__malloc(v->_alloc_size * sizeof(void *));
  	if (v->contents == NULL)
  		return GIT_ENOMEM;
  
  	return GIT_SUCCESS;
  }
  
  int git_vector_insert(git_vector *v, void *element)
  {
  	assert(v);
  
  	if (v->length >= v->_alloc_size) {
  		if (resize_vector(v) < 0)
  			return GIT_ENOMEM;
  	}
  
  	v->contents[v->length++] = element;
  	v->sorted = 0;
  
  	return GIT_SUCCESS;
  }
  
  int git_vector_insert_sorted(git_vector *v, void *element, int (*on_dup)(void **old, void *new))
  {
  	int error = GIT_SUCCESS;
  	size_t pos;
  
  	assert(v && v->_cmp);
  
  	if (!v->sorted)
  		git_vector_sort(v);
  
  	if (v->length >= v->_alloc_size) {
  		if (resize_vector(v) < 0)
  			return GIT_ENOMEM;
  	}
  
  	error = git__bsearch(v->contents, v->length, element, v->_cmp, &pos);
  
  	/* If we found the element and have a duplicate handler callback,
  	 * invoke it.  If it returns an error, then cancel insert, otherwise
  	 * proceed with normal insert.
  	 */
  	if (error == GIT_SUCCESS && on_dup != NULL) {
  		error = on_dup(&v->contents[pos], element);
  		if (error != GIT_SUCCESS)
  			return error;
  	}
  
  	/* shift elements to the right */
  	if (pos < v->length) {
  		memmove(v->contents + pos + 1, v->contents + pos,
  		        (v->length - pos) * sizeof(void *));
  	}
  
  	v->contents[pos] = element;
  	v->length++;
  
  	return GIT_SUCCESS;
  }
  
  void git_vector_sort(git_vector *v)
  {
  	assert(v);
  
  	if (v->sorted || v->_cmp == NULL)
  		return;
  
  	git__tsort(v->contents, v->length, v->_cmp);
  	v->sorted = 1;
  }
  
  int git_vector_bsearch2(git_vector *v, git_vector_cmp key_lookup, const void *key)
  {
  	size_t pos;
  
  	assert(v && key && key_lookup);
  
  	/* need comparison function to sort the vector */
  	if (v->_cmp == NULL)
  		return git__throw(GIT_ENOTFOUND, "Can't sort vector. No comparison function set");
  
  	git_vector_sort(v);
  
  	if (git__bsearch(v->contents, v->length, key, key_lookup,
  			&pos) == GIT_SUCCESS)
  		return (int)pos;
  
  	return git__throw(GIT_ENOTFOUND, "Can't find element");
  }
  
  int git_vector_search2(git_vector *v, git_vector_cmp key_lookup, const void *key)
  {
  	unsigned int i;
  
  	assert(v && key && key_lookup);
  
  	for (i = 0; i < v->length; ++i) {
  		if (key_lookup(key, v->contents[i]) == 0)
  			return i;
  	}
  
  	return git__throw(GIT_ENOTFOUND, "Can't find element");
  }
  
  static int strict_comparison(const void *a, const void *b)
  {
  	return (a == b) ? 0 : -1;
  }
  
  int git_vector_search(git_vector *v, const void *entry)
  {
  	return git_vector_search2(v, v->_cmp ? v->_cmp : strict_comparison, entry);
  }
  
  int git_vector_bsearch(git_vector *v, const void *key)
  {
  	return git_vector_bsearch2(v, v->_cmp, key);
  }
  
  int git_vector_remove(git_vector *v, unsigned int idx)
  {
  	unsigned int i;
  
  	assert(v);
  
  	if (idx >= v->length || v->length == 0)
  		return git__throw(GIT_ENOTFOUND, "Can't remove element. Index out of bounds");
  
  	for (i = idx; i < v->length - 1; ++i)
  		v->contents[i] = v->contents[i + 1];
  
  	v->length--;
  	return GIT_SUCCESS;
  }
  
  void git_vector_pop(git_vector *v)
  {
  	if (v->length > 0)
  		v->length--;
  }
  
  void git_vector_uniq(git_vector *v)
  {
  	git_vector_cmp cmp;
  	unsigned int i, j;
  
  	if (v->length <= 1)
  		return;
  
  	git_vector_sort(v);
  	cmp = v->_cmp ? v->_cmp : strict_comparison;
  
  	for (i = 0, j = 1 ; j < v->length; ++j)
  		if (!cmp(v->contents[i], v->contents[j]))
  			v->contents[i] = v->contents[j];
  		else
  			v->contents[++i] = v->contents[j];
  
  	v->length -= j - i - 1;
  }
  
  void git_vector_clear(git_vector *v)
  {
  	assert(v);
  	v->length = 0;
  	v->sorted = 1;
  }
  
  void git_vector_swap(git_vector *a, git_vector *b)
  {
  	git_vector t;
  
  	if (!a || !b || a == b)
  		return;
  
  	memcpy(&t, a, sizeof(t));
  	memcpy(a, b, sizeof(t));
  	memcpy(b, &t, sizeof(t));
  }
  

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