Merge remote-tracking branch 'upstream/master' into userreguserreg

1 files changed, 53 insertions, 17 deletions

diff --git a/src/nvim/os/stdpaths.c b/src/nvim/os/stdpaths.c
index 6b07b6ef70..7691aa5122 100644
--- a/src/nvim/os/stdpaths.c
+++ b/src/nvim/os/stdpaths.c
@@ -1,11 +1,11 @@
-// This is an open source non-commercial project. Dear PVS-Studio, please check
-// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
-
+#include <assert.h>
 #include <stdbool.h>
 #include <string.h>
 
-#include "nvim/ascii.h"
+#include "nvim/ascii_defs.h"
 #include "nvim/fileio.h"
+#include "nvim/func_attr.h"
+#include "nvim/globals.h"
 #include "nvim/memory.h"
 #include "nvim/os/os.h"
 #include "nvim/os/stdpaths_defs.h"
@@ -57,6 +57,39 @@ static const char *const xdg_defaults[] = {
 #endif
 };
 
+/// Get the value of $NVIM_APPNAME or "nvim" if not set.
+///
+/// @return $NVIM_APPNAME value
+const char *get_appname(void)
+{
+  const char *env_val = os_getenv("NVIM_APPNAME");
+  if (env_val == NULL || *env_val == '\0') {
+    env_val = "nvim";
+  }
+  return env_val;
+}
+
+/// Ensure that APPNAME is valid. Must be a name or relative path.
+bool appname_is_valid(void)
+{
+  const char *appname = get_appname();
+  if (path_is_absolute(appname)
+      // TODO(justinmk): on Windows, path_is_absolute says "/" is NOT absolute. Should it?
+      || strequal(appname, "/")
+      || strequal(appname, "\\")
+      || strequal(appname, ".")
+      || strequal(appname, "..")
+#ifdef BACKSLASH_IN_FILENAME
+      || strstr(appname, "\\..") != NULL
+      || strstr(appname, "..\\") != NULL
+#endif
+      || strstr(appname, "/..") != NULL
+      || strstr(appname, "../") != NULL) {
+    return false;
+  }
+  return true;
+}
+
 /// Return XDG variable value
 ///
 /// @param[in]  idx  XDG variable to use.
@@ -92,7 +125,7 @@ char *stdpaths_get_xdg_var(const XDGVarType idx)
       ret = "/tmp/";
     }
     size_t len = strlen(ret);
-    ret = xstrndup(ret, len >= 2 ? len - 1 : 0);  // Trim trailing slash.
+    ret = xmemdupz(ret, len >= 2 ? len - 1 : 0);  // Trim trailing slash.
   }
 
   return ret;
@@ -100,25 +133,28 @@ char *stdpaths_get_xdg_var(const XDGVarType idx)
 
 /// Return Nvim-specific XDG directory subpath.
 ///
-/// Windows: Uses "…/nvim-data" for kXDGDataHome to avoid storing
+/// Windows: Uses "…/$NVIM_APPNAME-data" for kXDGDataHome to avoid storing
 /// configuration and data files in the same path. #4403
 ///
 /// @param[in]  idx  XDG directory to use.
 ///
-/// @return [allocated] "{xdg_directory}/nvim"
+/// @return [allocated] "{xdg_directory}/$NVIM_APPNAME"
 char *get_xdg_home(const XDGVarType idx)
   FUNC_ATTR_WARN_UNUSED_RESULT
 {
   char *dir = stdpaths_get_xdg_var(idx);
+  const char *appname = get_appname();
+  size_t appname_len = strlen(appname);
+  assert(appname_len < (IOSIZE - sizeof("-data")));
+
   if (dir) {
+    xstrlcpy(IObuff, appname, appname_len + 1);
 #if defined(MSWIN)
-    dir = concat_fnames_realloc(dir,
-                                ((idx == kXDGDataHome
-                                  || idx == kXDGStateHome) ? "nvim-data" : "nvim"),
-                                true);
-#else
-    dir = concat_fnames_realloc(dir, "nvim", true);
+    if (idx == kXDGDataHome || idx == kXDGStateHome) {
+      xstrlcat(IObuff, "-data", IOSIZE);
+    }
 #endif
+    dir = concat_fnames_realloc(dir, IObuff, true);
 
 #ifdef BACKSLASH_IN_FILENAME
     slash_adjust(dir);
@@ -131,7 +167,7 @@ char *get_xdg_home(const XDGVarType idx)
 ///
 /// @param[in]  fname  New component of the path.
 ///
-/// @return [allocated] `$XDG_CACHE_HOME/nvim/{fname}`
+/// @return [allocated] `$XDG_CACHE_HOME/$NVIM_APPNAME/{fname}`
 char *stdpaths_user_cache_subpath(const char *fname)
   FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ALL FUNC_ATTR_NONNULL_RET
 {
@@ -142,7 +178,7 @@ char *stdpaths_user_cache_subpath(const char *fname)
 ///
 /// @param[in]  fname  New component of the path.
 ///
-/// @return [allocated] `$XDG_CONFIG_HOME/nvim/{fname}`
+/// @return [allocated] `$XDG_CONFIG_HOME/$NVIM_APPNAME/{fname}`
 char *stdpaths_user_conf_subpath(const char *fname)
   FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ALL FUNC_ATTR_NONNULL_RET
 {
@@ -153,7 +189,7 @@ char *stdpaths_user_conf_subpath(const char *fname)
 ///
 /// @param[in]  fname  New component of the path.
 ///
-/// @return [allocated] `$XDG_DATA_HOME/nvim/{fname}`
+/// @return [allocated] `$XDG_DATA_HOME/$NVIM_APPNAME/{fname}`
 char *stdpaths_user_data_subpath(const char *fname)
   FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ALL FUNC_ATTR_NONNULL_RET
 {
@@ -166,7 +202,7 @@ char *stdpaths_user_data_subpath(const char *fname)
 /// @param[in]  trailing_pathseps  Amount of trailing path separators to add.
 /// @param[in]  escape_commas  If true, all commas will be escaped.
 ///
-/// @return [allocated] `$XDG_STATE_HOME/nvim/{fname}`.
+/// @return [allocated] `$XDG_STATE_HOME/$NVIM_APPNAME/{fname}`.
 char *stdpaths_user_state_subpath(const char *fname, const size_t trailing_pathseps,
                                   const bool escape_commas)
   FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ALL FUNC_ATTR_NONNULL_RET