From 8b24f8dcbbee5e888a32044c9c06eb4eff690a0e Mon Sep 17 00:00:00 2001
From: Xavier Del Campo Romero <xavi.dcr@tutanota.com>
Date: Thu, 19 Oct 2023 15:34:24 +0200
Subject: usergen: Replace use of non-standard mktemp(1)

Despite common use in several POSIX operating systems, mktemp(1) is not
defined by POSIX.1-2008, nor even POSIX.1-2017. As long as it is not
introduced, m4(1)'s mkstemp can be used with similar effect.
---
 usergen | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/usergen b/usergen
index d4b89c4..1f02478 100755
--- a/usergen
+++ b/usergen
@@ -17,6 +17,13 @@ to_bin()
     sed -e 's,\([0-9a-f]\{2\}\),\\\\\\x\1,g' | xargs printf
 }
 
+mktemp_posix()
+{
+    m4 <<EOF
+mkstemp(${TMPDIR:-/tmp}/tmp.XXXXXX)
+EOF
+}
+
 if [ $# != 1 ]; then
     usage >&2
     exit 1
@@ -68,7 +75,7 @@ do
 done
 
 echo >&2
-TMP=$(mktemp)
+TMP=$(mktemp_posix)
 
 cleanup()
 {
-- 
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