From b5ea3c6d0747bd67f8a9214300c231a3e4c89abb Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Fri, 11 Aug 2017 21:30:06 -0700
Subject: [PATCH] Fixed bug 3284 - minor correction for SDL_setenv on _WIN32__
 platform

Coriiander

Here is a minor correction for a non-breaking mistake in SDL_setenv for __WIN32__ platform. See below for details.

FILE:
"SDL/src/stdlib/SDL_getenv.c"

FUNCTION: (__WIN32__ platform)
int SDL_setenv(const char *name, const char *value, int overwrite)

CODE:
    if (!overwrite) {
        char ch = 0;
        const size_t len = GetEnvironmentVariableA(name, &ch, sizeof (ch));
        if (len > 0) {
            return 0;  /* asked not to overwrite existing value. */
        }
    }


WHAT'S WRONG:
The 3th argument to GetEnvironmentVariable (being DWORD nSize) must be the number of characters, not the number of bytes. SDL currently passes "the size of 1 char", rather "1". While it is non-breaking (1=1 after all), it is incorrect. Furthermore there is no need to specify the 2nd and 3th arguments at all.

CORRECTION 1: (corrected argument_
    if (!overwrite) {
        char ch = 0;
        const size_t len = GetEnvironmentVariableA(name, &ch, 1);
        if (len > 0) {
            return 0;  /* asked not to overwrite existing value. */
        }
    }

CORRECTION 2: (stripped of unneeded code)
    if (!overwrite) {
        if (GetEnvironmentVariableA(name, NULL, 0) > 0) {
            return 0;  /* asked not to overwrite existing value. */
        }
    }
---
 src/stdlib/SDL_getenv.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/stdlib/SDL_getenv.c b/src/stdlib/SDL_getenv.c
index 8c7fc351e..305307feb 100644
--- a/src/stdlib/SDL_getenv.c
+++ b/src/stdlib/SDL_getenv.c
@@ -60,9 +60,7 @@ SDL_setenv(const char *name, const char *value, int overwrite)
     }
     
     if (!overwrite) {
-        char ch = 0;
-        const size_t len = GetEnvironmentVariableA(name, &ch, sizeof (ch));
-        if (len > 0) {
+        if (GetEnvironmentVariableA(name, NULL, 0) > 0) {
             return 0;  /* asked not to overwrite existing value. */
         }
     }