thodg/libgit2/src/pathspec.c

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• Hash : a277345e
  Author :
  Date : 2012-11-14T22:37:13
  

  Create internal strcmp variants for function ptrs Using the builtin strcmp and strcasecmp as function pointers is problematic on win32. This adds internal implementations and divorces us from the platform linkage.

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• src/pathspec.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 "pathspec.h"
  #include "attr_file.h"
  
  /* what is the common non-wildcard prefix for all items in the pathspec */
  char *git_pathspec_prefix(const git_strarray *pathspec)
  {
  	git_buf prefix = GIT_BUF_INIT;
  	const char *scan;
  
  	if (!pathspec || !pathspec->count ||
  		git_buf_common_prefix(&prefix, pathspec) < 0)
  		return NULL;
  
  	/* diff prefix will only be leading non-wildcards */
  	for (scan = prefix.ptr; *scan; ++scan) {
  		if (git__iswildcard(*scan) &&
  			(scan == prefix.ptr || (*(scan - 1) != '\\')))
  			break;
  	}
  	git_buf_truncate(&prefix, scan - prefix.ptr);
  
  	if (prefix.size <= 0) {
  		git_buf_free(&prefix);
  		return NULL;
  	}
  
  	git_buf_unescape(&prefix);
  
  	return git_buf_detach(&prefix);
  }
  
  /* is there anything in the spec that needs to be filtered on */
  bool git_pathspec_is_interesting(const git_strarray *pathspec)
  {
  	const char *str;
  
  	if (pathspec == NULL || pathspec->count == 0)
  		return false;
  	if (pathspec->count > 1)
  		return true;
  
  	str = pathspec->strings[0];
  	if (!str || !str[0] || (!str[1] && (str[0] == '*' || str[0] == '.')))
  		return false;
  	return true;
  }
  
  /* build a vector of fnmatch patterns to evaluate efficiently */
  int git_pathspec_init(
  	git_vector *vspec, const git_strarray *strspec, git_pool *strpool)
  {
  	size_t i;
  
  	memset(vspec, 0, sizeof(*vspec));
  
  	if (!git_pathspec_is_interesting(strspec))
  		return 0;
  
  	if (git_vector_init(vspec, strspec->count, NULL) < 0)
  		return -1;
  
  	for (i = 0; i < strspec->count; ++i) {
  		int ret;
  		const char *pattern = strspec->strings[i];
  		git_attr_fnmatch *match = git__calloc(1, sizeof(git_attr_fnmatch));
  		if (!match)
  			return -1;
  
  		match->flags = GIT_ATTR_FNMATCH_ALLOWSPACE;
  
  		ret = git_attr_fnmatch__parse(match, strpool, NULL, &pattern);
  		if (ret == GIT_ENOTFOUND) {
  			git__free(match);
  			continue;
  		} else if (ret < 0)
  			return ret;
  
  		if (git_vector_insert(vspec, match) < 0)
  			return -1;
  	}
  
  	return 0;
  }
  
  /* free data from the pathspec vector */
  void git_pathspec_free(git_vector *vspec)
  {
  	git_attr_fnmatch *match;
  	unsigned int i;
  
  	git_vector_foreach(vspec, i, match) {
  		git__free(match);
  		vspec->contents[i] = NULL;
  	}
  
  	git_vector_free(vspec);
  }
  
  /* match a path against the vectorized pathspec */
  bool git_pathspec_match_path(
  	git_vector *vspec, const char *path, bool disable_fnmatch, bool casefold)
  {
  	unsigned int i;
  	git_attr_fnmatch *match;
  	int fnmatch_flags = 0;
  	int (*use_strcmp)(const char *, const char *);
  	int (*use_strncmp)(const char *, const char *, size_t);
  
  	if (!vspec || !vspec->length)
  		return true;
  
  	if (disable_fnmatch)
  		fnmatch_flags = -1;
  	else if (casefold)
  		fnmatch_flags = FNM_CASEFOLD;
  
  	if (casefold) {
  		use_strcmp  = git__strcasecmp;
  		use_strncmp = git__strncasecmp;
  	} else {
  		use_strcmp  = git__strcmp;
  		use_strncmp = git__strncmp;
  	}
  
  	git_vector_foreach(vspec, i, match) {
  		int result = use_strcmp(match->pattern, path) ? FNM_NOMATCH : 0;
  
  		if (fnmatch_flags >= 0 && result == FNM_NOMATCH)
  			result = p_fnmatch(match->pattern, path, fnmatch_flags);
  
  		/* if we didn't match, look for exact dirname prefix match */
  		if (result == FNM_NOMATCH &&
  			(match->flags & GIT_ATTR_FNMATCH_HASWILD) == 0 &&
  			use_strncmp(path, match->pattern, match->length) == 0 &&
  			path[match->length] == '/')
  			result = 0;
  
  		if (result == 0)
  			return (match->flags & GIT_ATTR_FNMATCH_NEGATIVE) ? false : true;
  	}
  
  	return false;
  }
  
  

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