SDL  2.0
SDL_sysfilesystem.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2016 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 (!SUCCEEDED(SHGetFolderPathW(NULL, CSIDL_APPDATA | CSIDL_FLAG_CREATE, NULL, 0, path))) {
122  WIN_SetError("Couldn't locate our prefpath");
123  return NULL;
124  }
125 
126  worg = WIN_UTF8ToString(org);
127  if (worg == NULL) {
128  SDL_OutOfMemory();
129  return NULL;
130  }
131 
132  wapp = WIN_UTF8ToString(app);
133  if (wapp == NULL) {
134  SDL_free(worg);
135  SDL_OutOfMemory();
136  return NULL;
137  }
138 
139  new_wpath_len = lstrlenW(worg) + lstrlenW(wapp) + lstrlenW(path) + 3;
140 
141  if ((new_wpath_len + 1) > MAX_PATH) {
142  SDL_free(worg);
143  SDL_free(wapp);
144  WIN_SetError("Path too long.");
145  return NULL;
146  }
147 
148  lstrcatW(path, L"\\");
149  lstrcatW(path, worg);
150  SDL_free(worg);
151 
152  api_result = CreateDirectoryW(path, NULL);
153  if (api_result == FALSE) {
154  if (GetLastError() != ERROR_ALREADY_EXISTS) {
155  SDL_free(wapp);
156  WIN_SetError("Couldn't create a prefpath.");
157  return NULL;
158  }
159  }
160 
161  lstrcatW(path, L"\\");
162  lstrcatW(path, wapp);
163  SDL_free(wapp);
164 
165  api_result = CreateDirectoryW(path, NULL);
166  if (api_result == FALSE) {
167  if (GetLastError() != ERROR_ALREADY_EXISTS) {
168  WIN_SetError("Couldn't create a prefpath.");
169  return NULL;
170  }
171  }
172 
173  lstrcatW(path, L"\\");
174 
175  retval = WIN_StringToUTF8(path);
176 
177  return retval;
178 }
179 
180 #endif /* SDL_FILESYSTEM_WINDOWS */
181 
182 /* vi: set ts=4 sw=4 expandtab: */
#define WIN_UTF8ToString(S)
Definition: SDL_windows.h:46
#define SDL_realloc
GLenum GLsizei len
SDL_bool retval
void SDL_free(void *mem)
#define WIN_StringToUTF8(S)
Definition: SDL_windows.h:45
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:42
#define SDL_assert(condition)
Definition: SDL_assert.h:167
#define NULL
Definition: begin_code.h:143
#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:32
char * SDL_GetBasePath(void)
Get the path where the application resides.