From a81a74a1df01e3bd92a463aca2167bcfa9b3ee9f Mon Sep 17 00:00:00 2001
From: Jim Warner <james.warner@comcast.net>
Date: Thu, 26 Jan 2017 00:00:00 -0600
Subject: [PATCH] top: adapt the master branch XDG specification support

This patch adapts a master branch commit to our newlib
branch. Shown below was that original commit msg text.

------------------------------------------------------
top: Add unobtrusive XDG support

By default the file HOME/.toprc will be prefered.  This ensures there
should be minimal breakage even if this file is later created by some
other means.  Otherwise we will follow the new behaviour described by
the XDG Base Directory Specification:

If the XDG_CONFIG_HOME environment variable is available we will attempt
to use this as XDG_CONFIG_HOME/procps/toprc otherwise we will fall-back
to HOME/.config/procps/toprc instead.

Signed-off-by: Earnestly <zibeon@gmail.com>
------------------------------------------------------

Reference(s):
. master branch original
commit 0a0f7d60e309c13c8a399bc2187bed6e3e156b43
. discussion thread
https://gitlab.com/procps-ng/procps/merge_requests/38

Signed-off-by: Jim Warner <james.warner@comcast.net>
---
 top/top.1 | 15 +++++++++++----
 top/top.c | 25 +++++++++++++++++++++----
 2 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/top/top.1 b/top/top.1
index 83322798..1d7d1e8d 100644
--- a/top/top.1
+++ b/top/top.1
@@ -69,7 +69,7 @@
 .
 .\" Document /////////////////////////////////////////////////////////////
 .\" ----------------------------------------------------------------------
-.TH TOP 1 "November 2016" "procps-ng" "User Commands"
+.TH TOP 1 "January 2017" "procps-ng" "User Commands"
 .\" ----------------------------------------------------------------------
 
 .\" ----------------------------------------------------------------------
@@ -2189,7 +2189,14 @@ Here is an example of the contents of\fI /etc/toprc\fR:
 .\" ......................................................................
 .SS 6b. PERSONAL Configuration File
 .\" ----------------------------------------------------------------------
-This file is written as `$HOME/.your\-name\-4\-\*(We' + `rc'.
+The legacy version is written as `$HOME/.your\-name\-4\-\*(We' + `rc'
+with a leading period.
+
+A newly created \*(CF is written as procps/your\-name\-4\-\*(We' + `rc'
+without a leading period.
+The procps directory will be subordinate to either $XDG_CONFIG_HOME when
+set as an absolute path or the $HOME/.config directory.
+
 Use the `W' \*(CI to create it or update it.
 
 Here is the general layout:
@@ -2205,8 +2212,8 @@ Here is the general layout:
       "      # discussed below
 .fi
 
-If the $HOME variable is not present, \*(We will try to write the
-personal \*(CF to the current directory, subject to permissions.
+If the $HOME and $XDG_CONFIG_HOME variables are not present, \*(We will try
+to write the personal \*(CF in the current directory, subject to permissions.
 
 .\" ......................................................................
 .SS 6c. ADDING INSPECT Entries
diff --git a/top/top.c b/top/top.c
index da98ef14..9eb33641 100644
--- a/top/top.c
+++ b/top/top.c
@@ -40,6 +40,7 @@
 #include <sys/ioctl.h>
 #include <sys/resource.h>
 #include <sys/select.h>      // also available via <sys/types.h>
+#include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>       // also available via <stdlib.h>
 
@@ -2964,13 +2965,10 @@ static int config_cvt (WIN_t *q) {
 static void configs_read (void) {
    float tmp_delay = DEF_DELAY;
    char fbuf[LRGBUFSIZ];
-   const char *p;
+   const char *p, *p_home;
    FILE *fp;
    int i;
 
-   p = getenv("HOME");
-   snprintf(Rc_name, sizeof(Rc_name), "%s/.%src", (p && *p) ? p : ".", Myname);
-
    fp = fopen(SYS_RCFILESPEC, "r");
    if (fp) {
       if (fgets(fbuf, sizeof(fbuf), fp)) {     // sys rc file, line 1
@@ -2981,6 +2979,25 @@ static void configs_read (void) {
       fclose(fp);
    }
 
+   // attempt to use the legacy file first, if we cannot access that file, use
+   // the new XDG basedir locations (XDG_CONFIG_HOME or HOME/.config) instead.
+   p_home = getenv("HOME");
+   if (!p_home || p_home[0] == '\0')
+      p_home = ".";
+   snprintf(Rc_name, sizeof(Rc_name), "%s/.%src", p_home, Myname);
+
+   if (access(Rc_name, F_OK)) {
+      p = getenv("XDG_CONFIG_HOME");
+      // ensure the path we get is absolute, fallback otherwise.
+      if (!p || p[0] != '/') {
+         p = fmtmk("%s/.config", p_home);
+         (void)mkdir(p, 0700);
+      }
+      snprintf(Rc_name, sizeof(Rc_name), "%s/procps", p);
+      (void)mkdir(Rc_name, 0700);
+      snprintf(Rc_name, sizeof(Rc_name), "%s/procps/%src", p, Myname);
+   }
+
    fp = fopen(Rc_name, "r");
    if (fp) {
       int tmp_whole, tmp_fract;