[Bf-blender-cvs] [b99d6e1bed5] master: Fix errors in BKE_appdir_font_folder_default

[Campbell Barton]

Commit: b99d6e1bed5f238151abfc613448bbbfe67f78d0
Author: Campbell Barton
Date:   Mon Nov 1 13:42:12 2021 +1100
Branches: master
https://developer.blender.org/rBb99d6e1bed5f238151abfc613448bbbfe67f78d0

Fix errors in BKE_appdir_font_folder_default

- Missing NULL check for the HOME environment variable.
- The user preference path was written to even when the
  path didn't exist.

===================================================================

M	source/blender/blenkernel/intern/appdir.c

===================================================================

diff --git a/source/blender/blenkernel/intern/appdir.c b/source/blender/blenkernel/intern/appdir.c
index a43b708db52..d872dc67dcb 100644
--- a/source/blender/blenkernel/intern/appdir.c
+++ b/source/blender/blenkernel/intern/appdir.c
@@ -281,22 +281,29 @@ bool BKE_appdir_folder_caches(char *r_path, const size_t path_len)
  */
 bool BKE_appdir_font_folder_default(char *dir)
 {
+  char test_dir[FILE_MAXDIR];
+  test_dir[0] = '\0';
+
 #ifdef WIN32
   wchar_t wpath[FILE_MAXDIR];
   if (SHGetSpecialFolderPathW(0, wpath, CSIDL_FONTS, 0)) {
     wcscat(wpath, L"\\");
-    BLI_strncpy_wchar_as_utf8(dir, wpath, FILE_MAXDIR);
-    return (BLI_exists(dir));
+    BLI_strncpy_wchar_as_utf8(test_dir, wpath, sizeof(test_dir));
   }
-  return false;
 #elif defined(__APPLE__)
   const char *home = BLI_getenv("HOME");
-  BLI_snprintf(dir, FILE_MAXDIR, "%s/Library/Fonts/", home);
-  return (BLI_exists(dir));
+  if (home) {
+    BLI_path_join(test_dir, sizeof(test_dir), home, "Library", "Fonts", NULL);
+  }
 #else
-  BLI_strncpy(dir, "/usr/share/fonts/", FILE_MAXDIR);
-  return (BLI_exists(dir));
+  STRNCPY(test_dir, "/usr/share/fonts");
 #endif
+
+  if (test_dir[0] && BLI_exists(test_dir)) {
+    BLI_strncpy(dir, test_dir, FILE_MAXDIR);
+    return true;
+  }
+  return false;
 }
 
 /** \} */