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dynapi: Don't use SDL_getenv; it might malloc before the app sets an allocator.

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Use platform-specific code instead, so SDL's allocator never comes into play.

(cherry picked from commit d2693d4c7d)
This commit is contained in:
Ryan C. Gordon
2025-02-06 12:40:13 -05:00
parent c9341489cc
commit 8730f6a569
1 changed files with 20 additions and 5 deletions
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25
src/dynapi/SDL_dynapi.c
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@@ -33,6 +33,9 @@
#ifdef HAVE_STDIO_H
#include <stdio.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <SDL3/SDL.h>
#define SDL_MAIN_NOIMPL // don't drag in header-only implementation of SDL_main
@@ -42,6 +45,13 @@
// These headers have system specific definitions, so aren't included above
#include <SDL3/SDL_vulkan.h>
#if defined(WIN32) || defined(_WIN32) || defined(SDL_PLATFORM_CYGWIN)
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN 1
#endif
#include <windows.h>
#endif
/* This is the version of the dynamic API. This doesn't match the SDL version
and should not change until there's been a major revamp in API/ABI.
So 2.0.5 adds functions over 2.0.4? This number doesn't change;
@@ -438,10 +448,6 @@ Sint32 SDL_DYNAPI_entry(Uint32 apiver, void *table, Uint32 tablesize)
// Obviously we can't use SDL_LoadObject() to load SDL. :)
// Also obviously, we never close the loaded library.
#if defined(WIN32) || defined(_WIN32) || defined(SDL_PLATFORM_CYGWIN)
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN 1
#endif
#include <windows.h>
static SDL_INLINE void *get_sdlapi_entry(const char *fname, const char *sym)
{
HMODULE lib = LoadLibraryA(fname);
@@ -503,7 +509,16 @@ extern SDL_NORETURN void SDL_ExitProcess(int exitcode);
static void SDL_InitDynamicAPILocked(void)
{
const char *libname = SDL_getenv_unsafe_REAL(SDL_DYNAMIC_API_ENVVAR);
// this can't use SDL_getenv_unsafe_REAL, because it might allocate memory before the app can set their allocator.
#if defined(WIN32) || defined(_WIN32) || defined(__CYGWIN__)
// We've always used LoadLibraryA for this, so this has never worked with Unicode paths on Windows. Sorry.
char envbuf[512]; // overflows will just report as environment variable being unset, but LoadLibraryA has a MAX_PATH of 260 anyhow, apparently.
const DWORD rc = GetEnvironmentVariableA(SDL_DYNAMIC_API_ENVVAR, envbuf, (DWORD) sizeof (envbuf));
char *libname = ((rc != 0) && (rc < sizeof (envbuf))) ? envbuf : NULL;
#else
char *libname = getenv(SDL_DYNAMIC_API_ENVVAR);
#endif
SDL_DYNAPI_ENTRYFN entry = NULL; // funcs from here by default.
bool use_internal = true;