Merge commit 'dec0d4ec4153bf9fc2b78ae6c2df45b6ea8dde7a' as 'external/sdl/SDL'

external/sdl/SDL/src/SDL_utils.c

@@ -0,0 +1,63 @@
+/*
+  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"
+
+#include "SDL_utils_c.h"
+
+/* Common utility functions that aren't in the public API */
+
+int SDL_powerof2(int x)
+{
+    int value;
+
+    if (x <= 0) {
+        /* Return some sane value - we shouldn't hit this in our use cases */
+        return 1;
+    }
+
+    /* This trick works for 32-bit values */
+    {
+        SDL_COMPILE_TIME_ASSERT(SDL_powerof2, sizeof(x) == sizeof(Uint32));
+    }
+    value = x;
+    value -= 1;
+    value |= value >> 1;
+    value |= value >> 2;
+    value |= value >> 4;
+    value |= value >> 8;
+    value |= value >> 16;
+    value += 1;
+
+    return value;
+}
+
+SDL_bool SDL_endswith(const char *string, const char *suffix)
+{
+    size_t string_length = string ? SDL_strlen(string) : 0;
+    size_t suffix_length = suffix ? SDL_strlen(suffix) : 0;
+
+    if (suffix_length > 0 && suffix_length <= string_length) {
+        if (SDL_memcmp(string + string_length - suffix_length, suffix, suffix_length) == 0) {
+            return SDL_TRUE;
+        }
+    }
+    return SDL_FALSE;
+}