Atlas - SDL_sysfilesystem.c
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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
36char *
37SDL_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);
65            SDL_OutOfMemory();
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
103char *
104SDL_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: */
193
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