建档

Library/SDL2-2.28.5/src/filesystem/windows/SDL_sysfilesystem.c

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+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifdef SDL_FILESYSTEM_WINDOWS
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+/* System dependent filesystem routines                                */
+
+#include "../../core/windows/SDL_windows.h"
+#include <shlobj.h>
+
+#include "SDL_error.h"
+#include "SDL_stdinc.h"
+#include "SDL_filesystem.h"
+
+char *SDL_GetBasePath(void)
+{
+    DWORD buflen = 128;
+    WCHAR *path = NULL;
+    char *retval = NULL;
+    DWORD len = 0;
+    int i;
+
+    while (SDL_TRUE) {
+        void *ptr = SDL_realloc(path, buflen * sizeof(WCHAR));
+        if (ptr == NULL) {
+            SDL_free(path);
+            SDL_OutOfMemory();
+            return NULL;
+        }
+
+        path = (WCHAR *)ptr;
+
+        len = GetModuleFileNameW(NULL, path, buflen);
+        /* if it truncated, then len >= buflen - 1 */
+        /* if there was enough room (or failure), len < buflen - 1 */
+        if (len < buflen - 1) {
+            break;
+        }
+
+        /* buffer too small? Try again. */
+        buflen *= 2;
+    }
+
+    if (len == 0) {
+        SDL_free(path);
+        WIN_SetError("Couldn't locate our .exe");
+        return NULL;
+    }
+
+    for (i = len - 1; i > 0; i--) {
+        if (path[i] == '\\') {
+            break;
+        }
+    }
+
+    SDL_assert(i > 0);  /* Should have been an absolute path. */
+    path[i + 1] = '\0'; /* chop off filename. */
+
+    retval = WIN_StringToUTF8W(path);
+    SDL_free(path);
+
+    return retval;
+}
+
+char *SDL_GetPrefPath(const char *org, const char *app)
+{
+    /*
+     * Vista and later has a new API for this, but SHGetFolderPath works there,
+     *  and apparently just wraps the new API. This is the new way to do it:
+     *
+     *     SHGetKnownFolderPath(FOLDERID_RoamingAppData, KF_FLAG_CREATE,
+     *                          NULL, &wszPath);
+     */
+
+    WCHAR path[MAX_PATH];
+    char *retval = NULL;
+    WCHAR *worg = NULL;
+    WCHAR *wapp = NULL;
+    size_t new_wpath_len = 0;
+    BOOL api_result = FALSE;
+
+    if (app == NULL) {
+        SDL_InvalidParamError("app");
+        return NULL;
+    }
+    if (org == NULL) {
+        org = "";
+    }
+
+    if (!SUCCEEDED(SHGetFolderPathW(NULL, CSIDL_APPDATA | CSIDL_FLAG_CREATE, NULL, 0, path))) {
+        WIN_SetError("Couldn't locate our prefpath");
+        return NULL;
+    }
+
+    worg = WIN_UTF8ToStringW(org);
+    if (worg == NULL) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+
+    wapp = WIN_UTF8ToStringW(app);
+    if (wapp == NULL) {
+        SDL_free(worg);
+        SDL_OutOfMemory();
+        return NULL;
+    }
+
+    new_wpath_len = SDL_wcslen(worg) + SDL_wcslen(wapp) + SDL_wcslen(path) + 3;
+
+    if ((new_wpath_len + 1) > MAX_PATH) {
+        SDL_free(worg);
+        SDL_free(wapp);
+        WIN_SetError("Path too long.");
+        return NULL;
+    }
+
+    if (*worg) {
+        SDL_wcslcat(path, L"\\", SDL_arraysize(path));
+        SDL_wcslcat(path, worg, SDL_arraysize(path));
+    }
+    SDL_free(worg);
+
+    api_result = CreateDirectoryW(path, NULL);
+    if (api_result == FALSE) {
+        if (GetLastError() != ERROR_ALREADY_EXISTS) {
+            SDL_free(wapp);
+            WIN_SetError("Couldn't create a prefpath.");
+            return NULL;
+        }
+    }
+
+    SDL_wcslcat(path, L"\\", SDL_arraysize(path));
+    SDL_wcslcat(path, wapp, SDL_arraysize(path));
+    SDL_free(wapp);
+
+    api_result = CreateDirectoryW(path, NULL);
+    if (api_result == FALSE) {
+        if (GetLastError() != ERROR_ALREADY_EXISTS) {
+            WIN_SetError("Couldn't create a prefpath.");
+            return NULL;
+        }
+    }
+
+    SDL_wcslcat(path, L"\\", SDL_arraysize(path));
+
+    retval = WIN_StringToUTF8W(path);
+
+    return retval;
+}
+
+#endif /* SDL_FILESYSTEM_WINDOWS */
+
+#ifdef SDL_FILESYSTEM_XBOX
+#include "SDL_filesystem.h"
+#include "SDL_error.h"
+char *SDL_GetBasePath(void)
+{
+    SDL_Unsupported();
+    return NULL;
+}
+
+char *SDL_GetPrefPath(const char *org, const char *app)
+{
+    SDL_Unsupported();
+    return NULL;
+}
+#endif /* SDL_FILESYSTEM_XBOX */
+
+/* vi: set ts=4 sw=4 expandtab: */