thodg/libgit2/src/commit_list.c

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• Hash : 4ff192d3
  Author :
  Date : 2012-11-26T19:47:47
  

  Move merge functions to merge.c In so doing, promote commit_list to git_commit_list, with its own internal API header.

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• src/commit_list.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 "commit_list.h"
  #include "common.h"
  #include "revwalk.h"
  #include "pool.h"
  #include "odb.h"
  
  int git_commit_list_time_cmp(void *a, void *b)
  {
  	git_commit_list_node *commit_a = (git_commit_list_node *)a;
  	git_commit_list_node *commit_b = (git_commit_list_node *)b;
  
  	return (commit_a->time < commit_b->time);
  }
  
  git_commit_list *git_commit_list_insert(git_commit_list_node *item, git_commit_list **list_p)
  {
  	git_commit_list *new_list = git__malloc(sizeof(git_commit_list));
  	if (new_list != NULL) {
  		new_list->item = item;
  		new_list->next = *list_p;
  	}
  	*list_p = new_list;
  	return new_list;
  }
  
  git_commit_list *git_commit_list_insert_by_date(git_commit_list_node *item, git_commit_list **list_p)
  {
  	git_commit_list **pp = list_p;
  	git_commit_list *p;
  
  	while ((p = *pp) != NULL) {
  		if (git_commit_list_time_cmp(p->item, item) < 0)
  			break;
  
  		pp = &p->next;
  	}
  
  	return git_commit_list_insert(item, pp);
  }
  
  git_commit_list_node *git_commit_list_alloc_node(git_revwalk *walk)
  {
  	return (git_commit_list_node *)git_pool_malloc(&walk->commit_pool, COMMIT_ALLOC);
  }
  
  static int commit_error(git_commit_list_node *commit, const char *msg)
  {
  	char commit_oid[GIT_OID_HEXSZ + 1];
  	git_oid_fmt(commit_oid, &commit->oid);
  	commit_oid[GIT_OID_HEXSZ] = '\0';
  
  	giterr_set(GITERR_ODB, "Failed to parse commit %s - %s", commit_oid, msg);
  
  	return -1;
  }
  
  static git_commit_list_node **alloc_parents(
  	git_revwalk *walk, git_commit_list_node *commit, size_t n_parents)
  {
  	if (n_parents <= PARENTS_PER_COMMIT)
  		return (git_commit_list_node **)((char *)commit + sizeof(git_commit_list_node));
  
  	return (git_commit_list_node **)git_pool_malloc(
  		&walk->commit_pool, (uint32_t)(n_parents * sizeof(git_commit_list_node *)));
  }
  
  
  void git_commit_list_free(git_commit_list **list_p)
  {
  	git_commit_list *list = *list_p;
  
  	if (list == NULL)
  		return;
  
  	while (list) {
  		git_commit_list *temp = list;
  		list = temp->next;
  		git__free(temp);
  	}
  
  	*list_p = NULL;
  }
  
  git_commit_list_node *git_commit_list_pop(git_commit_list **stack)
  {
  	git_commit_list *top = *stack;
  	git_commit_list_node *item = top ? top->item : NULL;
  
  	if (top) {
  		*stack = top->next;
  		git__free(top);
  	}
  	return item;
  }
  
  static int commit_quick_parse(git_revwalk *walk, git_commit_list_node *commit, git_rawobj *raw)
  {
  	const size_t parent_len = strlen("parent ") + GIT_OID_HEXSZ + 1;
  	unsigned char *buffer = raw->data;
  	unsigned char *buffer_end = buffer + raw->len;
  	unsigned char *parents_start, *committer_start;
  	int i, parents = 0;
  	int commit_time;
  
  	buffer += strlen("tree ") + GIT_OID_HEXSZ + 1;
  
  	parents_start = buffer;
  	while (buffer + parent_len < buffer_end && memcmp(buffer, "parent ", strlen("parent ")) == 0) {
  		parents++;
  		buffer += parent_len;
  	}
  
  	commit->parents = alloc_parents(walk, commit, parents);
  	GITERR_CHECK_ALLOC(commit->parents);
  
  	buffer = parents_start;
  	for (i = 0; i < parents; ++i) {
  		git_oid oid;
  
  		if (git_oid_fromstr(&oid, (char *)buffer + strlen("parent ")) < 0)
  			return -1;
  
  		commit->parents[i] = commit_lookup(walk, &oid);
  		if (commit->parents[i] == NULL)
  			return -1;
  
  		buffer += parent_len;
  	}
  
  	commit->out_degree = (unsigned short)parents;
  
  	if ((committer_start = buffer = memchr(buffer, '\n', buffer_end - buffer)) == NULL)
  		return commit_error(commit, "object is corrupted");
  
  	buffer++;
  
  	if ((buffer = memchr(buffer, '\n', buffer_end - buffer)) == NULL)
  		return commit_error(commit, "object is corrupted");
  
  	/* Skip trailing spaces */
  	while (buffer > committer_start && git__isspace(*buffer))
  		buffer--;
  
  	/* Seek for the begining of the pack of digits */
  	while (buffer > committer_start && git__isdigit(*buffer))
  		buffer--;
  
  	/* Skip potential timezone offset */
  	if ((buffer > committer_start) && (*buffer == '+' || *buffer == '-')) {
  		buffer--;
  
  		while (buffer > committer_start && git__isspace(*buffer))
  			buffer--;
  
  		while (buffer > committer_start && git__isdigit(*buffer))
  			buffer--;
  	}
  
  	if ((buffer == committer_start) || (git__strtol32(&commit_time, (char *)(buffer + 1), NULL, 10) < 0))
  		return commit_error(commit, "cannot parse commit time");
  
  	commit->time = (time_t)commit_time;
  	commit->parsed = 1;
  	return 0;
  }
  
  int git_commit_list_parse(git_revwalk *walk, git_commit_list_node *commit)
  {
  	git_odb_object *obj;
  	int error;
  
  	if (commit->parsed)
  		return 0;
  
  	if ((error = git_odb_read(&obj, walk->odb, &commit->oid)) < 0)
  		return error;
  	assert(obj->raw.type == GIT_OBJ_COMMIT);
  
  	error = commit_quick_parse(walk, commit, &obj->raw);
  	git_odb_object_free(obj);
  	return error;
  }
  
  

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