pg_waldump: Fix invalid option handling

Previously, running pg_waldump with an invalid option (pg_waldump
--foo) would print the help output and exit successfully.  This was
because it tried to process the option letter '?' as a normal option,
but that letter is used by getopt() to report an invalid option.

To fix, process help and version options separately, like we do
everywhere else.  Also add a basic test suite for pg_waldump and run
the basic option handling tests, which would have caught this.

src/bin/pg_waldump/.gitignore

@@ -2,3 +2,6 @@
 # Source files copied from src/backend/access/rmgrdesc/
 /*desc.c
 /xlogreader.c
+
+# Generated by test suite
+/tmp_check/

src/bin/pg_waldump/Makefile

@@ -38,3 +38,10 @@ uninstall:
 
 clean distclean maintainer-clean:
 	rm -f pg_waldump$(X) $(OBJS) $(RMGRDESCSOURCES) xlogreader.c
+	rm -rf tmp_check
+
+check:
+	$(prove_check)
+
+installcheck:
+	$(prove_installcheck)

src/bin/pg_waldump/pg_waldump.c

@@ -806,6 +806,7 @@ usage(void)
 	printf(_("  -z, --stats[=record]   show statistics instead of records\n"
 			 "                         (optionally, show per-record statistics)\n"));
 	printf(_("  -?, --help             show this help, then exit\n"));
+	printf(_("\nReport bugs to <pgsql-bugs@lists.postgresql.org>.\n"));
 }
 
 int
@@ -844,6 +845,20 @@ main(int argc, char **argv)
 	set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_waldump"));
 	progname = get_progname(argv[0]);
 
+	if (argc > 1)
+	{
+		if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
+		{
+			usage();
+			exit(0);
+		}
+		if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
+		{
+			puts("pg_waldump (PostgreSQL) " PG_VERSION);
+			exit(0);
+		}
+	}
+
 	memset(&private, 0, sizeof(XLogDumpPrivate));
 	memset(&config, 0, sizeof(XLogDumpConfig));
 	memset(&stats, 0, sizeof(XLogDumpStats));
@@ -869,7 +884,7 @@ main(int argc, char **argv)
 		goto bad_argument;
 	}
 
-	while ((option = getopt_long(argc, argv, "be:?fn:p:r:s:t:Vx:z",
+	while ((option = getopt_long(argc, argv, "be:fn:p:r:s:t:x:z",
 								 long_options, &optindex)) != -1)
 	{
 		switch (option)
@@ -889,10 +904,6 @@ main(int argc, char **argv)
 			case 'f':
 				config.follow = true;
 				break;
-			case '?':
-				usage();
-				exit(EXIT_SUCCESS);
-				break;
 			case 'n':
 				if (sscanf(optarg, "%d", &config.stop_after_records) != 1)
 				{
@@ -947,10 +958,6 @@ main(int argc, char **argv)
 					goto bad_argument;
 				}
 				break;
-			case 'V':
-				puts("pg_waldump (PostgreSQL) " PG_VERSION);
-				exit(EXIT_SUCCESS);
-				break;
 			case 'x':
 				if (sscanf(optarg, "%u", &config.filter_by_xid) != 1)
 				{

src/bin/pg_waldump/t/001_basic.pl

+use strict;
+use warnings;
+use TestLib;
+use Test::More tests => 8;
+
+program_help_ok('pg_waldump');
+program_version_ok('pg_waldump');
+program_options_handling_ok('pg_waldump');