rpcgen(1): default to "STDIN" as input file when compiling to headers.

FreeBSD, NetBSD, and GNU all use a variation of "STDIN" as the
default input filename when compiling to header files (-h) to prevent
a NULL-pointer deference. Adopt a similar approach.

ok millert@

diff --git a/usr.bin/rpcgen/rpc_main.c b/usr.bin/rpcgen/rpc_main.c
index 3d04fdc..ef82a73 100644 (file)
--- a/usr.bin/rpcgen/rpc_main.c
+++ b/usr.bin/rpcgen/rpc_main.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: rpc_main.c,v 1.35 2019/06/28 13:35:03 deraadt Exp $        */
+/* $OpenBSD: rpc_main.c,v 1.36 2024/07/22 17:55:18 dv Exp $     */
 /* $NetBSD: rpc_main.c,v 1.9 1996/02/19 11:12:43 pk Exp $       */
 
 /*
@@ -480,7 +480,10 @@ h_output(infile, define, extend, outfile)
        outfilename = extend ? extendfile(infile, outfile) : outfile;
        open_output(infile, outfilename);
        add_warning();
-       guard = generate_guard(outfilename ? outfilename : infile);
+       if (outfilename || infile)
+               guard = generate_guard(outfilename ? outfilename : infile);
+       else
+               guard = generate_guard("STDIN");
 
        fprintf(fout, "#ifndef _%s\n#define _%s\n\n", guard,
                guard);