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-rw-r--r--ui/ncurses/Makefile.am2
-rw-r--r--ui/ncurses/console-codes.c178
-rw-r--r--ui/ncurses/console-codes.h20
-rw-r--r--ui/ncurses/nc-cui.c28
4 files changed, 228 insertions, 0 deletions
diff --git a/ui/ncurses/Makefile.am b/ui/ncurses/Makefile.am
index 40e11b8..3bc5254 100644
--- a/ui/ncurses/Makefile.am
+++ b/ui/ncurses/Makefile.am
@@ -24,6 +24,8 @@ ui_ncurses_libpbnc_la_SOURCES = \
ui/ncurses/nc-config.c \
ui/ncurses/nc-config.h \
ui/ncurses/nc-config-help.c \
+ ui/ncurses/console-codes.c \
+ ui/ncurses/console-codes.h \
ui/ncurses/nc-cui.c \
ui/ncurses/nc-cui.h \
ui/ncurses/nc-cui-help.c \
diff --git a/ui/ncurses/console-codes.c b/ui/ncurses/console-codes.c
new file mode 100644
index 0000000..5c28615
--- /dev/null
+++ b/ui/ncurses/console-codes.c
@@ -0,0 +1,178 @@
+/*
+ * Copyright (C) 2017 IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "talloc/talloc.h"
+
+#ifndef PETITBOOT_TEST
+#include "log/log.h"
+#include "nc-scr.h"
+#endif
+
+#include "console-codes.h"
+
+#define ESC_CHAR 033
+#define CSI_CHAR '['
+#define INTER_CHAR_START 040
+#define INTER_CHAR_END 057
+#define ESC_SEQUENCE_FINAL_START 060
+#define ESC_SEQUENCE_FINAL_END 0176
+#define CTRL_SEQUENCE_FINAL_START 0100
+#define CTRL_SEQUENCE_FINAL_END 0176
+#define DEC_PARAMETER 077
+
+enum console_sequence_state {
+ CONSOLE_STATE_START,
+ CONSOLE_STATE_ESC_SEQ,
+ CONSOLE_STATE_CTRL_SEQ_START,
+ CONSOLE_STATE_CTRL_SEQ,
+ CONSOLE_STATE_DONE,
+ CONSOLE_STATE_CONFUSED,
+};
+
+static inline bool is_intermediate(signed char c)
+{
+ return c > INTER_CHAR_START && c < INTER_CHAR_END;
+}
+
+static inline bool is_parameter(signed char c)
+{
+ return (c >= 060 && c <= 071) || c == 073;
+}
+
+static inline bool is_escape_final(signed char c)
+{
+ return c >= ESC_SEQUENCE_FINAL_START && c < ESC_SEQUENCE_FINAL_END;
+}
+
+static inline bool is_control_final(signed char c)
+{
+ return c >= CTRL_SEQUENCE_FINAL_START && c <= CTRL_SEQUENCE_FINAL_END;
+}
+
+static char console_sequence_getch(char **sequence)
+{
+ signed char c = getch();
+
+ if (c != ERR)
+ *sequence = talloc_asprintf_append(*sequence, "%c", c);
+ return c;
+}
+
+/*
+ * Catch terminal control sequences that have accidentally been sent to
+ * Petitboot. These are of the form
+ * ESC I .. I F
+ * where I is an Intermediate Character and F is a Final Character, eg:
+ * ESC ^ [ ? 1 ; 0 c
+ * or ESC # 6
+ *
+ * This is based off the definitions provided by
+ * https://vt100.net/docs/vt100-ug/contents.html
+ */
+char *handle_control_sequence(void *ctx, signed char start)
+{
+ enum console_sequence_state state = CONSOLE_STATE_START;
+ bool in_sequence = true;
+ signed char c;
+ char *seq;
+
+ if (start != ESC_CHAR) {
+ pb_log("%s: Called with non-escape character: 0%o\n",
+ __func__, start);
+ return NULL;
+ }
+
+ seq = talloc_asprintf(ctx, "%c", start);
+
+ while (in_sequence) {
+ switch (state) {
+ case CONSOLE_STATE_START:
+ c = console_sequence_getch(&seq);
+ if (c == CSI_CHAR)
+ state = CONSOLE_STATE_CTRL_SEQ_START;
+ else if (is_intermediate(c))
+ state = CONSOLE_STATE_ESC_SEQ;
+ else if (is_escape_final(c))
+ state = CONSOLE_STATE_DONE;
+ else if (c != ERR) {
+ /* wait on c == ERR */
+ pb_debug("Unexpected start: \\x%x\n", c);
+ state = CONSOLE_STATE_CONFUSED;
+ }
+ break;
+ case CONSOLE_STATE_ESC_SEQ:
+ c = console_sequence_getch(&seq);
+ if (is_intermediate(c))
+ state = CONSOLE_STATE_ESC_SEQ;
+ else if (is_escape_final(c))
+ state = CONSOLE_STATE_DONE;
+ else if (c != ERR) {
+ /* wait on c == ERR */
+ pb_debug("Unexpected character after intermediate: \\x%x\n",
+ c);
+ state = CONSOLE_STATE_CONFUSED;
+ }
+ break;
+ case CONSOLE_STATE_CTRL_SEQ_START:
+ c = console_sequence_getch(&seq);
+ if (is_intermediate(c) || is_parameter(c) ||
+ c == DEC_PARAMETER)
+ state = CONSOLE_STATE_CTRL_SEQ;
+ else if (is_control_final(c))
+ state = CONSOLE_STATE_DONE;
+ else if (c != ERR) {
+ /* wait on c == ERR */
+ pb_debug("Unexpected character in param string: \\x%x\n",
+ c);
+ state = CONSOLE_STATE_CONFUSED;
+ }
+ break;
+ case CONSOLE_STATE_CTRL_SEQ:
+ c = console_sequence_getch(&seq);
+ if (is_intermediate(c) || is_parameter(c))
+ state = CONSOLE_STATE_CTRL_SEQ;
+ else if (is_control_final(c))
+ state = CONSOLE_STATE_DONE;
+ else if (c != ERR) {
+ /* wait on c == ERR */
+ pb_debug("Unexpected character in param string: \\x%x\n",
+ c);
+ state = CONSOLE_STATE_CONFUSED;
+ }
+ break;
+ case CONSOLE_STATE_DONE:
+ in_sequence = false;
+ break;
+ case CONSOLE_STATE_CONFUSED:
+ /* fall-through */
+ default:
+ pb_debug("We got lost interpreting a control sequence!\n");
+ seq = talloc_asprintf_append(seq, "...");
+ in_sequence = false;
+ break;
+ };
+ }
+
+ return seq;
+}
diff --git a/ui/ncurses/console-codes.h b/ui/ncurses/console-codes.h
new file mode 100644
index 0000000..97c0e52
--- /dev/null
+++ b/ui/ncurses/console-codes.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2017 IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#if !defined(_PB_UI_CONSOLE_CODES)
+#define _PB_UI_CONSOLE_CODES
+
+char *handle_control_sequence(void *ctx, signed char start);
+
+#endif
diff --git a/ui/ncurses/nc-cui.c b/ui/ncurses/nc-cui.c
index 6ced24c..8060510 100644
--- a/ui/ncurses/nc-cui.c
+++ b/ui/ncurses/nc-cui.c
@@ -21,6 +21,7 @@
#endif
#include <assert.h>
+#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
@@ -45,6 +46,7 @@
#include "nc-statuslog.h"
#include "nc-subset.h"
#include "nc-plugin.h"
+#include "console-codes.h"
extern const struct help_text main_menu_help_text;
extern const struct help_text plugin_menu_help_text;
@@ -524,6 +526,9 @@ static bool process_global_keys(struct cui *cui, int key)
static int cui_process_key(void *arg)
{
struct cui *cui = cui_from_arg(arg);
+ unsigned int i;
+ char *sequence;
+ int grab;
assert(cui->current);
@@ -535,6 +540,29 @@ static int cui_process_key(void *arg)
if (c == ERR)
break;
+ if (c == 27) {
+ /*
+ * If this is a console code sequence try to parse it
+ * and don't treat this as a key press.
+ */
+ grab = getch();
+ if (grab != ERR && grab != 27) {
+ ungetch(grab);
+ pb_debug("%s: Caught unhandled command sequence\n",
+ __func__);
+ sequence = handle_control_sequence(cui, c);
+ pb_debug("Caught sequence ");
+ if (sequence) {
+ pb_debug("(%zu): ", strlen(sequence));
+ for (i = 0; i < strlen(sequence); i++)
+ pb_debug("0%o ", sequence[i]);
+ pb_debug("\n");
+ } else
+ pb_debug("(0): (none)\n");
+ continue;
+ }
+ }
+
if (!cui->has_input) {
cui->has_input = true;
if (cui->client) {
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