gzexe: port to macOS mktemp

Problem reported by Jeffrey Walton (Bug#30000).
* gzexe.in, zdiff.in, zgrep.in:
Don’t assume that mktemp works when given no arguments,
as this is not true for macOS.  Instead, use a syntax
that should work with coreutils, NetBSD, and macOS.
While we’re in the neighborhood, be more consistent about how program
names are used in temporary file names.  Also, watch out for TMPDIR
values that are not absolute file names, since they can cause problems
(e.g., leading "-").

1 files changed, 8 insertions, 3 deletions

diff --git a/zdiff.in b/zdiff.in
index bf644dd..960bf86 100644
--- a/zdiff.in
+++ b/zdiff.in
@@ -116,12 +116,17 @@ elif test $# -eq 2; then
                           test -n "$tmp" && rm -f "$tmp"
                           (exit 2); exit 2
                         ' HUP INT PIPE TERM 0
+                        case $TMPDIR in
+                          / | /*/) ;;
+                          /*) TMPDIR=$TMPDIR/;;
+                          *) TMPDIR=/tmp/;;
+                        esac
                         if type mktemp >/dev/null 2>&1; then
-                          tmp=`mktemp` || exit 2
+                          tmp=`mktemp "${TMPDIR}zdiffXXXXXXXXX"` ||
+                            exit 2
                         else
-                          F=`expr "/$2" : '.*/\(.*\)[-.][zZtga]*$'` || F=$prog
                           set -C
-                          tmp=${TMPDIR-/tmp}/$F.$$
+                          tmp=${TMPDIR}zdiff$$
                         fi
                         gzip -cdfq -- "$2" > "$tmp" || exit 2
                         gzip_status=$(