From 76bc15156f94dab9e489eb6008b9c2ad38accaed Mon Sep 17 00:00:00 2001
From: Michael Martin <mcmartin@gmail.com>
Date: Tue, 9 Jun 2020 17:45:55 -0700
Subject: [PATCH] dirname can modify its argument; don't pass in a const char *

---
 sc2/src/options.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/sc2/src/options.c b/sc2/src/options.c
index 46c7c30c1..ee9a577e4 100644
--- a/sc2/src/options.c
+++ b/sc2/src/options.c
@@ -156,9 +156,16 @@ prepareContentDir (const char *contentDirName, const char* addonDirName, const c
 		if (loc == NULL)
 		{
 			char *tempDir = (char *) HMalloc (PATH_MAX);
+			char *execFileDup;
+
+			/* dirname can modify its argument, so we need a local
+			 * mutable copy of it. */
+			execFileDup = (char *) HMalloc (strlen (execFile) + 1);
+			strcpy (execFileDup, execFile);
 			snprintf (tempDir, PATH_MAX, "%s/../Resources/content",
-					dirname (execFile));
+					dirname (execFileDup));
 			loc = findFileInDirs ((const char **) &tempDir, 1, testFile);
+			HFree (execFileDup);
 			HFree (tempDir);
 		}
 #endif