SDL  2.0
SDL_sysfilesystem.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
4 
5  This software is provided 'as-is', without any express or implied
6  warranty. In no event will the authors be held liable for any damages
7  arising from the use of this software.
8 
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12 
13  1. The origin of this software must not be misrepresented; you must not
14  claim that you wrote the original software. If you use this software
15  in a product, an acknowledgment in the product documentation would be
16  appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18  misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../../SDL_internal.h"
22 
23 #ifdef SDL_FILESYSTEM_WINDOWS
24 
25 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
26 /* System dependent filesystem routines */
27 
28 #include "../../core/windows/SDL_windows.h"
29 #include <shlobj.h>
30 
31 #include "SDL_assert.h"
32 #include "SDL_error.h"
33 #include "SDL_stdinc.h"
34 #include "SDL_filesystem.h"
35 
36 char *
37 SDL_GetBasePath(void)
38 {
39  typedef DWORD (WINAPI *GetModuleFileNameExW_t)(HANDLE, HMODULE, LPWSTR, DWORD);
40  GetModuleFileNameExW_t pGetModuleFileNameExW;
41  DWORD buflen = 128;
42  WCHAR *path = NULL;
43  HANDLE psapi = LoadLibrary(L"psapi.dll");
44  char *retval = NULL;
45  DWORD len = 0;
46  int i;
47 
48  if (!psapi) {
49  WIN_SetError("Couldn't load psapi.dll");
50  return NULL;
51  }
52 
53  pGetModuleFileNameExW = (GetModuleFileNameExW_t)GetProcAddress(psapi, "GetModuleFileNameExW");
54  if (!pGetModuleFileNameExW) {
55  WIN_SetError("Couldn't find GetModuleFileNameExW");
56  FreeLibrary(psapi);
57  return NULL;
58  }
59 
60  while (SDL_TRUE) {
61  void *ptr = SDL_realloc(path, buflen * sizeof (WCHAR));
62  if (!ptr) {
63  SDL_free(path);
64  FreeLibrary(psapi);
66  return NULL;
67  }
68 
69  path = (WCHAR *) ptr;
70 
71  len = pGetModuleFileNameExW(GetCurrentProcess(), NULL, path, buflen);
72  if (len != buflen) {
73  break;
74  }
75 
76  /* buffer too small? Try again. */
77  buflen *= 2;
78  }
79 
80  FreeLibrary(psapi);
81 
82  if (len == 0) {
83  SDL_free(path);
84  WIN_SetError("Couldn't locate our .exe");
85  return NULL;
86  }
87 
88  for (i = len-1; i > 0; i--) {
89  if (path[i] == '\\') {
90  break;
91  }
92  }
93 
94  SDL_assert(i > 0); /* Should have been an absolute path. */
95  path[i+1] = '\0'; /* chop off filename. */
96 
97  retval = WIN_StringToUTF8(path);
98  SDL_free(path);
99 
100  return retval;
101 }
102 
103 char *
104 SDL_GetPrefPath(const char *org, const char *app)
105 {
106  /*
107  * Vista and later has a new API for this, but SHGetFolderPath works there,
108  * and apparently just wraps the new API. This is the new way to do it:
109  *
110  * SHGetKnownFolderPath(FOLDERID_RoamingAppData, KF_FLAG_CREATE,
111  * NULL, &wszPath);
112  */
113 
114  WCHAR path[MAX_PATH];
115  char *retval = NULL;
116  WCHAR* worg = NULL;
117  WCHAR* wapp = NULL;
118  size_t new_wpath_len = 0;
119  BOOL api_result = FALSE;
120 
121  if (!app) {
122  SDL_InvalidParamError("app");
123  return NULL;
124  }
125  if (!org) {
126  org = "";
127  }
128 
129  if (!SUCCEEDED(SHGetFolderPathW(NULL, CSIDL_APPDATA | CSIDL_FLAG_CREATE, NULL, 0, path))) {
130  WIN_SetError("Couldn't locate our prefpath");
131  return NULL;
132  }
133 
134  worg = WIN_UTF8ToString(org);
135  if (worg == NULL) {
136  SDL_OutOfMemory();
137  return NULL;
138  }
139 
140  wapp = WIN_UTF8ToString(app);
141  if (wapp == NULL) {
142  SDL_free(worg);
143  SDL_OutOfMemory();
144  return NULL;
145  }
146 
147  new_wpath_len = lstrlenW(worg) + lstrlenW(wapp) + lstrlenW(path) + 3;
148 
149  if ((new_wpath_len + 1) > MAX_PATH) {
150  SDL_free(worg);
151  SDL_free(wapp);
152  WIN_SetError("Path too long.");
153  return NULL;
154  }
155 
156  if (*worg) {
157  lstrcatW(path, L"\\");
158  lstrcatW(path, worg);
159  }
160  SDL_free(worg);
161 
162  api_result = CreateDirectoryW(path, NULL);
163  if (api_result == FALSE) {
164  if (GetLastError() != ERROR_ALREADY_EXISTS) {
165  SDL_free(wapp);
166  WIN_SetError("Couldn't create a prefpath.");
167  return NULL;
168  }
169  }
170 
171  lstrcatW(path, L"\\");
172  lstrcatW(path, wapp);
173  SDL_free(wapp);
174 
175  api_result = CreateDirectoryW(path, NULL);
176  if (api_result == FALSE) {
177  if (GetLastError() != ERROR_ALREADY_EXISTS) {
178  WIN_SetError("Couldn't create a prefpath.");
179  return NULL;
180  }
181  }
182 
183  lstrcatW(path, L"\\");
184 
185  retval = WIN_StringToUTF8(path);
186 
187  return retval;
188 }
189 
190 #endif /* SDL_FILESYSTEM_WINDOWS */
191 
192 /* vi: set ts=4 sw=4 expandtab: */
#define WIN_UTF8ToString(S)
Definition: SDL_windows.h:47
#define SDL_InvalidParamError(param)
Definition: SDL_error.h:54
#define SDL_realloc
GLenum GLsizei len
SDL_bool retval
#define SDL_free
#define WIN_StringToUTF8(S)
Definition: SDL_windows.h:46
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
#define SDL_assert(condition)
Definition: SDL_assert.h:169
#define NULL
Definition: begin_code.h:164
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
#define SUCCEEDED(x)
Definition: SDL_directx.h:51
int WIN_SetError(const char *prefix)
#define SDL_GetPrefPath
Include file for filesystem SDL API functions.
GLsizei const GLchar *const * path
#define FALSE
Definition: edid-parse.c:34
char * SDL_GetBasePath(void)
Get the path where the application resides.