add ifquery --version

Makefile

@@ -1,5 +1,10 @@
+PACKAGE_NAME := ifupdown-ng
+PACKAGE_VERSION := 0.0.1
+PACKAGE_BUGREPORT := https://github.com/kaniini/ifupdown-ng/issues/new
+
+
 INTERFACES_FILE := /etc/network/interfaces
-CFLAGS := -ggdb3 -O2 -Wall -I. -DINTERFACES_FILE=\"${INTERFACES_FILE}\"
+CFLAGS := -ggdb3 -O2 -Wall -I. -DINTERFACES_FILE=\"${INTERFACES_FILE}\" -DPACKAGE_NAME=\"${PACKAGE_NAME}\" -DPACKAGE_VERSION=\"${PACKAGE_VERSION}\" -DPACKAGE_BUGREPORT=\"${PACKAGE_BUGREPORT}\"
 
 
 LIBIFUPDOWN_SRC = \
@@ -7,7 +12,8 @@ LIBIFUPDOWN_SRC = \
 	libifupdown/dict.c \
 	libifupdown/interface.c \
 	libifupdown/interface-file.c \
-	libifupdown/fgetline.c
+	libifupdown/fgetline.c \
+	libifupdown/version.c
 
 LIBIFUPDOWN_OBJ = ${LIBIFUPDOWN_SRC:.c=.o}
 LIBIFUPDOWN_LIB = libifupdown.a

cmd/ifquery.c

@@ -64,6 +64,8 @@ usage()
 	printf("       ifquery [options] --list\n");
 
 	printf("\nOptions:\n");
+	printf("  -h, --help                   this help\n");
+	printf("  -V, --version                show this program's version\n");
 	printf("  -i, --interfaces FILE        use FILE for interface definitions\n");
 
 	exit(1);
@@ -74,6 +76,8 @@ main(int argc, char *argv[])
 {
 	struct lif_dict collection;
 	struct option long_options[] = {
+		{"help", no_argument, 0, 'h'},
+		{"version", no_argument, 0, 'V'},
 		{"interfaces", required_argument, 0, 'i'},
 		{NULL, 0, 0, 0}
 	};
@@ -81,11 +85,17 @@ main(int argc, char *argv[])
 
 	for (;;)
 	{
-		int c = getopt_long(argc, argv, "i:", long_options, NULL);
+		int c = getopt_long(argc, argv, "hVi:", long_options, NULL);
 		if (c == -1)
 			break;
 
 		switch (c) {
+		case 'h':
+			usage();
+			break;
+		case 'V':
+			lif_common_version();
+			break;
 		case 'i':
 			interfaces_file = optarg;
 			break;

libifupdown/libifupdown.h

@@ -21,5 +21,6 @@
 #include "libifupdown/interface.h"
 #include "libifupdown/interface-file.h"
 #include "libifupdown/fgetline.h"
+#include "libifupdown/version.h"
 
 #endif

libifupdown/version.c

@@ -0,0 +1,39 @@
+/*
+ * libifupdown/version.c
+ * Purpose: lif_common_version() header
+ *
+ * Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * This software is provided 'as is' and without any warranty, express or
+ * implied.  In no event shall the authors be liable for any damages arising
+ * from the use of this software.
+ */
+
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "libifupdown/version.h"
+
+void
+lif_common_version(void)
+{
+	printf("%s %s\n", PACKAGE_NAME, PACKAGE_VERSION);
+
+	printf("\nCopyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>\n\n");
+
+	printf("Permission to use, copy, modify, and/or distribute this software for any\n");
+	printf("purpose with or without fee is hereby granted, provided that the above\n");
+	printf("copyright notice and this permission notice appear in all copies.\n\n");
+
+	printf("This software is provided 'as is' and without any warranty, express or\n");
+	printf("implied.  In no event shall the authors be liable for any damages arising\n");
+	printf("from the use of this software.\n\n");
+
+	printf("Report bugs at <%s>.\n", PACKAGE_BUGREPORT);
+
+	exit(EXIT_SUCCESS);
+}

libifupdown/version.h

@@ -0,0 +1,21 @@
+/*
+ * libifupdown/version.h
+ * Purpose: lif_common_version() header
+ *
+ * Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * This software is provided 'as is' and without any warranty, express or
+ * implied.  In no event shall the authors be liable for any damages arising
+ * from the use of this software.
+ */
+
+#ifndef LIBIFUPDOWN_VERSION_H__GUARD
+#define LIBIFUPDOWN_VERSION_H__GUARD
+
+extern void lif_common_version(void);
+
+#endif