1 files changed, 164 insertions, 0 deletions
diff --git a/usr.sbin/ractl/parser.c b/usr.sbin/ractl/parser.c
new file mode 100644
index 00000000000..26597f20507
--- /dev/null
+++ b/usr.sbin/ractl/parser.c
@@ -0,0 +1,164 @@
+/*	$OpenBSD: parser.c,v 1.1 2018/07/10 22:12:43 florian Exp $	*/
+
+/*
+ * Copyright (c) 2004 Esben Norby <norby@openbsd.org>
+ * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
+ *
+ * Permission to use, copy, modify, and 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.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <err.h>
+#include <errno.h>
+#include <event.h>
+#include <imsg.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "rad.h"
+#include "parser.h"
+
+enum token_type {
+	NOTOKEN,
+	ENDTOKEN,
+	KEYWORD
+};
+
+struct token {
+	enum token_type		 type;
+	const char		*keyword;
+	int			 value;
+	const struct token	*next;
+};
+
+static const struct token t_main[];
+static const struct token t_log[];
+
+static const struct token t_main[] = {
+	{KEYWORD,	"reload",	RELOAD,		NULL},
+	{KEYWORD,	"log",		NONE,		t_log},
+	{ENDTOKEN,	"",		NONE,		NULL}
+};
+
+static const struct token t_log[] = {
+	{KEYWORD,	"verbose",	LOG_VERBOSE,	NULL},
+	{KEYWORD,	"brief",	LOG_BRIEF,	NULL},
+	{ENDTOKEN,	"",		NONE,		NULL}
+};
+
+static const struct token *match_token(const char *, const struct token *,
+    struct parse_result *);
+static void show_valid_args(const struct token *);
+
+struct parse_result *
+parse(int argc, char *argv[])
+{
+	static struct parse_result	res;
+	const struct token	*table = t_main;
+	const struct token	*match;
+
+	memset(&res, 0, sizeof(res));
+
+	while (argc >= 0) {
+		if ((match = match_token(argv[0], table, &res)) == NULL) {
+			fprintf(stderr, "valid commands/args:\n");
+			show_valid_args(table);
+			return (NULL);
+		}
+
+		argc--;
+		argv++;
+
+		if (match->type == NOTOKEN || match->next == NULL)
+			break;
+
+		table = match->next;
+	}
+
+	if (argc > 0) {
+		fprintf(stderr, "superfluous argument: %s\n", argv[0]);
+		return (NULL);
+	}
+
+	return (&res);
+}
+
+static const struct token *
+match_token(const char *word, const struct token *table,
+    struct parse_result *res)
+{
+	u_int			 i, match;
+	const struct token	*t = NULL;
+
+	match = 0;
+
+	for (i = 0; table[i].type != ENDTOKEN; i++) {
+		switch (table[i].type) {
+		case NOTOKEN:
+			if (word == NULL || strlen(word) == 0) {
+				match++;
+				t = &table[i];
+			}
+			break;
+		case KEYWORD:
+			if (word != NULL && strncmp(word, table[i].keyword,
+			    strlen(word)) == 0) {
+				match++;
+				t = &table[i];
+				if (t->value)
+					res->action = t->value;
+			}
+			break;
+		case ENDTOKEN:
+			break;
+		}
+	}
+
+	if (match != 1) {
+		if (word == NULL)
+			fprintf(stderr, "missing argument:\n");
+		else if (match > 1)
+			fprintf(stderr, "ambiguous argument: %s\n", word);
+		else if (match < 1)
+			fprintf(stderr, "unknown argument: %s\n", word);
+		return (NULL);
+	}
+
+	return (t);
+}
+
+static void
+show_valid_args(const struct token *table)
+{
+	int	i;
+
+	for (i = 0; table[i].type != ENDTOKEN; i++) {
+		switch (table[i].type) {
+		case NOTOKEN:
+			fprintf(stderr, "  <cr>\n");
+			break;
+		case KEYWORD:
+			fprintf(stderr, "  %s\n", table[i].keyword);
+			break;
+		case ENDTOKEN:
+			break;
+		}
+	}
+}