Fall back to executable path if we have trouble converting known path.

doc/fixes36.5

@@ -25,7 +25,7 @@ Fixes to Post-3.6.4 Problems that Were Exposed Via git Repository
 Platform- and/or Interface-Specific Fixes or Features
 -----------------------------------------------------
 Windows OPTIONS=map_mode:fit_to_screen could cause a game start failure
-
+Windows users with C-locale unmappable names could get game start failure
 
 General New Features
 --------------------

sys/winnt/windmain.c

@@ -79,24 +79,34 @@ static struct stat hbuf;
 
 extern char orgdir[];
 
-void
+int
 get_known_folder_path(
     const KNOWNFOLDERID * folder_id,
     char * path
     , size_t path_size)
 {
     PWSTR wide_path;
-    if (FAILED(SHGetKnownFolderPath(folder_id, 0, NULL, &wide_path)))
+    if (FAILED(SHGetKnownFolderPath(folder_id, 0, NULL, &wide_path))) {
         error("Unable to get known folder path");
+        return FALSE;
+    }
 
     size_t converted;
     errno_t err;
 
-    err = wcstombs_s(&converted, path, path_size, wide_path, path_size - 1);
+    err = wcstombs_s(&converted, path, path_size, wide_path, _TRUNCATE);
 
     CoTaskMemFree(wide_path);
 
-    if (err != 0) error("Failed folder path string conversion");
+    if (err == STRUNCATE || err == EILSEQ) {
+        // silently handle this problem
+        return FALSE;
+    } else if (err != 0) {
+        error("Failed folder (%u) path string conversion, unexpected err = %d", folder_id->Data1, err);
+        return FALSE;
+    }
+
+    return TRUE;
 }
 
 void
@@ -108,14 +118,16 @@ create_directory(const char * path)
         error("Unable to create directory '%s'", path);
 }
 
-void
+int
 build_known_folder_path(
     const KNOWNFOLDERID * folder_id,
     char * path,
     size_t path_size,
     boolean versioned)
 {
-    get_known_folder_path(folder_id, path, path_size);
+    if(!get_known_folder_path(folder_id, path, path_size))
+        return FALSE;
+
     strcat(path, "\\NetHack\\");
     create_directory(path);
     if (versioned) {
@@ -123,6 +135,7 @@ build_known_folder_path(
                     VERSION_MAJOR, VERSION_MINOR);
         create_directory(path);
     }
+    return TRUE;
 }
 
 void
@@ -250,17 +263,22 @@ set_default_prefix_locations(const char *programPath)
         fqn_prefix[TROUBLEPREFIX] = portable_device_path;
         fqn_prefix[DATAPREFIX]    = executable_path;
     } else {
-        build_known_folder_path(&FOLDERID_Profile, profile_path,
+        if(!build_known_folder_path(&FOLDERID_Profile, profile_path,
-            sizeof(profile_path), FALSE);
+            sizeof(profile_path), FALSE))
+            strcpy(profile_path, executable_path);
 
-        build_known_folder_path(&FOLDERID_Profile, versioned_profile_path,
+        if(!build_known_folder_path(&FOLDERID_Profile, versioned_profile_path,
-            sizeof(profile_path), TRUE);
+            sizeof(profile_path), TRUE))
+            strcpy(versioned_profile_path, executable_path);
 
-        build_known_folder_path(&FOLDERID_LocalAppData,
+        if(!build_known_folder_path(&FOLDERID_LocalAppData,
-            versioned_user_data_path, sizeof(versioned_user_data_path), TRUE);
+            versioned_user_data_path, sizeof(versioned_user_data_path), TRUE))
+            strcpy(versioned_user_data_path, executable_path);
+
+        if(!build_known_folder_path(&FOLDERID_ProgramData,
+            versioned_global_data_path, sizeof(versioned_global_data_path), TRUE))
+            strcpy(versioned_global_data_path, executable_path);
 
-        build_known_folder_path(&FOLDERID_ProgramData,
-            versioned_global_data_path, sizeof(versioned_global_data_path), TRUE);
         fqn_prefix[SYSCONFPREFIX] = versioned_global_data_path;
         fqn_prefix[CONFIGPREFIX]  = profile_path;
         fqn_prefix[HACKPREFIX]    = versioned_profile_path;