thodg/libgit2/src/pathspec.c

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• Hash : 7bf87ab6
  Author :
  Date : 2012-11-28T09:58:48
  

  Consolidate text buffer functions There are many scattered functions that look into the contents of buffers to do various text manipulations (such as escaping or unescaping data, calculating text stats, guessing if content is binary, etc). This groups all those functions together into a new file and converts the code to use that. This has two enhancements to existing functionality. The old text stats function is significantly rewritten and the BOM detection code was extended (although largely we can't deal with anything other than a UTF8 BOM).

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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 "buf_text.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_text_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_text_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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