thodg/libgit2/src/win32/findfile.c

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• Hash : 359fc2d2
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  Date : 2013-01-08T17:07:25
  

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• src/win32/findfile.c

• /*
   * 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.
   */
  
  #include "utf-conv.h"
  #include "path.h"
  #include "findfile.h"
  
  #ifndef _WIN64
  #define REG_MSYSGIT_INSTALL L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\Git_is1"
  #else
  #define REG_MSYSGIT_INSTALL L"SOFTWARE\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\Git_is1"
  #endif
  
  int win32_expand_path(struct win32_path *s_root, const wchar_t *templ)
  {
  	s_root->len = ExpandEnvironmentStringsW(templ, s_root->path, MAX_PATH);
  	return s_root->len ? 0 : -1;
  }
  
  int win32_find_file(git_buf *path, const struct win32_path *root, const char *filename)
  {
  	size_t len, alloc_len;
  	wchar_t *file_utf16 = NULL;
  	char file_utf8[GIT_PATH_MAX];
  
  	if (!root || !filename || (len = strlen(filename)) == 0)
  		return GIT_ENOTFOUND;
  
  	/* allocate space for wchar_t path to file */
  	alloc_len = root->len + len + 2;
  	file_utf16 = git__calloc(alloc_len, sizeof(wchar_t));
  	GITERR_CHECK_ALLOC(file_utf16);
  
  	/* append root + '\\' + filename as wchar_t */
  	memcpy(file_utf16, root->path, root->len * sizeof(wchar_t));
  
  	if (*filename == '/' || *filename == '\\')
  		filename++;
  
  	git__utf8_to_16(file_utf16 + root->len - 1, alloc_len, filename);
  
  	/* check access */
  	if (_waccess(file_utf16, F_OK) < 0) {
  		git__free(file_utf16);
  		return GIT_ENOTFOUND;
  	}
  
  	git__utf16_to_8(file_utf8, file_utf16);
  	git_path_mkposix(file_utf8);
  	git_buf_sets(path, file_utf8);
  
  	git__free(file_utf16);
  	return 0;
  }
  
  wchar_t* win32_nextpath(wchar_t *path, wchar_t *buf, size_t buflen)
  {
  	wchar_t term, *base = path;
  
  	assert(path && buf && buflen);
  
  	term = (*path == L'"') ? *path++ : L';';
  
  	for (buflen--; *path && *path != term && buflen; buflen--)
  		*buf++ = *path++;
  
  	*buf = L'\0'; /* reserved a byte via initial subtract */
  
  	while (*path == term || *path == L';')
  		path++;
  
  	return (path != base) ? path : NULL;
  }
  
  int win32_find_system_file_using_path(git_buf *path, const char *filename)
  {
  	wchar_t * env = NULL;
  	struct win32_path root;
  
  	env = _wgetenv(L"PATH");
  	if (!env)
  		return -1;
  
  	// search in all paths defined in PATH
  	while ((env = win32_nextpath(env, root.path, MAX_PATH - 1)) != NULL && *root.path)
  	{
  		wchar_t * pfin = root.path + wcslen(root.path) - 1; // last char of the current path entry
  
  		// ensure trailing slash
  		if (*pfin != L'/' && *pfin != L'\\')
  			wcscpy(++pfin, L"\\"); // we have enough space left, MAX_PATH - 1 is used in nextpath above
  
  		root.len = (DWORD)wcslen(root.path) + 1;
  
  		if (win32_find_file(path, &root, "git.cmd") == 0 || win32_find_file(path, &root, "git.exe") == 0) {
  			// we found the cmd or bin directory of a git installaton
  			if (root.len > 5) {
  				wcscpy(root.path + wcslen(root.path) - 4, L"etc\\");
  				if (win32_find_file(path, &root, filename) == 0)
  					return 0;
  			}
  		}
  	}
  	
  	return GIT_ENOTFOUND;
  }
  
  int win32_find_system_file_using_registry(git_buf *path, const char *filename)
  {
  	struct win32_path root;
  
  	HKEY hKey;
  	DWORD dwType = REG_SZ;
  	DWORD dwSize = MAX_PATH;
  
  	root.len = 0;
  	if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, REG_MSYSGIT_INSTALL, 0, KEY_ALL_ACCESS, &hKey) == ERROR_SUCCESS)
  	{
  		if (RegQueryValueExW(hKey, L"InstallLocation", NULL, &dwType,(LPBYTE)&root.path, &dwSize) == ERROR_SUCCESS)
  		{
  			// InstallLocation points to the root of the msysgit directory
  			if (dwSize + 4 > MAX_PATH) // 4 = wcslen(L"etc\\")
  			{
  				giterr_set(GITERR_OS, "Cannot locate the system's msysgit directory - path too long");
  				return -1;
  			}
  			wcscat(root.path, L"etc\\");
  			root.len = (DWORD)wcslen(root.path) + 1;
  		}
  	}
  	RegCloseKey(hKey);
  
  	if (!root.len) {
  		giterr_set(GITERR_OS, "Cannot locate the system's msysgit directory");
  		return -1;
  	}
  
  	if (win32_find_file(path, &root, filename) < 0) {
  		giterr_set(GITERR_OS, "The system file '%s' doesn't exist", filename);
  		git_buf_clear(path);
  		return GIT_ENOTFOUND;
  	}
  
  	return 0;
  }
  

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