From fac10ea799fe9b6158d74f66d6ad46536d38a545 Mon Sep 17 00:00:00 2001
From: Patrick McHardy <kaber@trash.net>
Date: Wed, 18 Mar 2009 04:55:00 +0100
Subject: Initial commit

---
 src/cli.c | 175 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 175 insertions(+)
 create mode 100644 src/cli.c

(limited to 'src/cli.c')

diff --git a/src/cli.c b/src/cli.c
new file mode 100644
index 00000000..e302dfa8
--- /dev/null
+++ b/src/cli.c
@@ -0,0 +1,175 @@
+/*
+ * Asynchronous readline-based interactive interface
+ *
+ * Actually not asynchronous so far, but intended to be.
+ *
+ * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <ctype.h>
+#include <limits.h>
+#include <readline/readline.h>
+#include <readline/history.h>
+
+#include <nftables.h>
+#include <parser.h>
+#include <erec.h>
+#include <utils.h>
+
+#define CMDLINE_HISTFILE	".nft.history"
+
+static const struct input_descriptor indesc_cli = {
+	.type	= INDESC_CLI,
+};
+
+static struct parser_state *state;
+static void *scanner;
+
+static char histfile[PATH_MAX];
+static char *multiline;
+static bool eof;
+
+static char *cli_append_multiline(char *line)
+{
+	bool complete = false;
+	size_t len;
+	char *s;
+
+	if (line == NULL && multiline == NULL) {
+		eof = true;
+		return NULL;
+	}
+
+	len = strlen(line);
+	if (line[len - 1] == '\\') {
+		line[len - 1] = '\0';
+		len--;
+	} else if (multiline == NULL)
+		return line;
+	else
+		complete = 1;
+
+	if (multiline == NULL) {
+		multiline = line;
+		rl_save_prompt();
+		rl_clear_message();
+	} else {
+		len += strlen(multiline);
+		s = xmalloc(len + 1);
+		snprintf(s, len + 1, "%s%s", multiline, line);
+		xfree(multiline);
+		multiline = s;
+	}
+	line = NULL;
+
+	if (complete) {
+		line = multiline;
+		multiline = NULL;
+		rl_restore_prompt();
+	}
+	return line;
+}
+
+static void cli_complete(char *line)
+{
+	const HIST_ENTRY *hist;
+	const char *c;
+
+	line = cli_append_multiline(line);
+	if (line == NULL)
+		return;
+
+	for (c = line; *c != '\0'; c++)
+		if (!isspace(*c))
+			break;
+	if (*c == '\0')
+		return;
+
+	/* avoid duplicate history entries */
+	hist = history_get(history_length);
+	if (hist == NULL || strcmp(hist->line, line))
+		add_history(line);
+
+	scanner_push_buffer(scanner, &indesc_cli, line);
+	nft_parse(scanner, state);
+
+	erec_print_list(stdout, state->msgs);
+	xfree(line);
+}
+
+static char **cli_completion(const char *text, int start, int end)
+{
+	return NULL;
+}
+
+void __fmtstring(1, 0) cli_display(const char *fmt, va_list ap)
+{
+	int point, end;
+	char *buf;
+
+	point = rl_point;
+	end   = rl_end;
+	rl_point = rl_end = 0;
+
+	rl_save_prompt();
+	rl_clear_message();
+
+	if (vasprintf(&buf, fmt, ap) < 0)
+		fprintf(rl_outstream, "cli_display: out of memory\n");
+	else {
+		fprintf(rl_outstream, "%s\n", buf);
+		xfree(buf);
+	}
+
+	rl_restore_prompt();
+
+	rl_point = point;
+	rl_end   = end;
+	rl_forced_update_display();
+}
+
+int cli_init(void *_scanner, struct parser_state *_state)
+{
+	const char *home;
+
+	rl_readline_name = "nft";
+	rl_instream  = stdin;
+	rl_outstream = stdout;
+
+	rl_callback_handler_install("nft> ", cli_complete);
+	rl_attempted_completion_function = cli_completion;
+
+	home = getenv("HOME");
+	if (home == NULL)
+		home = "";
+	snprintf(histfile, sizeof(histfile), "%s/%s", home, CMDLINE_HISTFILE);
+
+	read_history(histfile);
+	history_set_pos(history_length);
+
+	scanner = _scanner;
+	state	= _state;
+
+	while (!eof)
+		rl_callback_read_char();
+	return 0;
+}
+
+void cli_exit(void)
+{
+	rl_callback_handler_remove();
+	rl_deprep_terminal();
+	write_history(histfile);
+}
-- 
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