SDL: Fixed crash in SDL_startswith() when passed NULL strings (89eb5)

SDL Commits
1 
From 89eb50b25eec31886fbce8c16e05bdb4bbb7ebd5 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Fri, 24 Apr 2026 07:30:12 -0700
Subject: [PATCH] Fixed crash in SDL_startswith() when passed NULL strings

Fixes https://github.com/libsdl-org/SDL/issues/15451

(cherry picked from commit f3d7df54e2c06ba1921621d069984c599b572372)
---
 src/SDL_utils.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/SDL_utils.c b/src/SDL_utils.c
index 2667390ac627d..a4a0d77614e80 100644
--- a/src/SDL_utils.c
+++ b/src/SDL_utils.c
@@ -111,7 +111,8 @@ void SDL_CalculateFraction(float x, int *numerator, int *denominator)
 
 bool SDL_startswith(const char *string, const char *prefix)
 {
-    if (SDL_strncmp(string, prefix, SDL_strlen(prefix)) == 0) {
+    if (string && prefix &&
+        SDL_strncmp(string, prefix, SDL_strlen(prefix)) == 0) {
         return true;
     }
     return false;