From dfa62506b7b412eeaea8efe1a5cb68e34fbfa88c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=BD=D0=B0=D0=B1?= <nabijaczleweli@nabijaczleweli.xyz>
Date: Mon, 4 Oct 2021 15:08:55 +0200
Subject: Allow -u UID

Defaults to username, of course, like all POSIX utilities do
---
 CommandLine.c | 9 +++++++--
 htop.1.in     | 2 +-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/CommandLine.c b/CommandLine.c
index a352e4e3..c48572c2 100644
--- a/CommandLine.c
+++ b/CommandLine.c
@@ -11,6 +11,7 @@ in the source distribution for its full text.
 #include "CommandLine.h"
 
 #include <assert.h>
+#include <ctype.h>
 #include <getopt.h>
 #include <locale.h>
 #include <stdbool.h>
@@ -178,8 +179,12 @@ static CommandLineSettings parseArguments(const char* program, int argc, char**
             if (!username) {
                flags.userId = geteuid();
             } else if (!Action_setUserOnly(username, &(flags.userId))) {
-               fprintf(stderr, "Error: invalid user \"%s\".\n", username);
-               exit(1);
+               for (const char *itr = username; *itr; ++itr)
+                  if (!isdigit((unsigned char)*itr)) {
+                     fprintf(stderr, "Error: invalid user \"%s\".\n", username);
+                     exit(1);
+                  }
+               flags.userId = atol(username);
             }
             break;
          }
diff --git a/htop.1.in b/htop.1.in
index 7371efa0..702f7c23 100644
--- a/htop.1.in
+++ b/htop.1.in
@@ -62,7 +62,7 @@ Show only the given PIDs
 Sort by this column (use \-\-sort\-key help for a column list).
 This will force a list view unless you specify -t at the same time.
 .TP
-\fB\-u \-\-user=USERNAME\fR
+\fB\-u \-\-user=USERNAME|UID\fR
 Show only the processes of a given user
 .TP
 \fB\-U \-\-no-unicode\fR
-- 
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