summaryrefslogtreecommitdiffstats
path: root/VNFs/DPPD-PROX/input_curses.c
blob: 4ea2e4a86d0c217eb186a1ad25f416372146b8eb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
/*
// Copyright (c) 2010-2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/

#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>

#include "log.h"
#include "input.h"
#include "display.h"
#include "run.h"
#include "cmd_parser.h"
#include "input_curses.h"
#include "histedit.h"
#include "libedit_autoconf.h"

static EditLine *el;
static History *hist;

static struct input input_curses;
static int tabbed;

static void show_history(struct input *input)
{
	HistEvent event;

	history(hist, &event, H_LAST);

	do {
		plog_info("%s", event.str); /* event.str contains newline */
	} while (history(hist, &event, H_PREV) != -1);
}

static int complete(__attribute__((unused)) int ch)
{
	const LineInfo *li;
	size_t len;
	size_t n_match = 0;
	char complete_cmd[128] = {0};
	int complete_cmd_partial = 0;

	li = el_line(el);
	for (size_t i = 0; i < cmd_parser_n_cmd(); ++i) {
		len = li->lastchar - li->buffer;
		if (strncmp(cmd_parser_cmd(i), li->buffer, len) == 0) {
			if (n_match) {
				size_t cur_len = strlen(complete_cmd);
				for (size_t j = 0; j < cur_len; ++j) {
					if (complete_cmd[j] != cmd_parser_cmd(i)[j]) {
						complete_cmd[j] = 0;
						complete_cmd_partial = 1;
						break;
					}
				}
			}
			else {
				strcpy(complete_cmd, cmd_parser_cmd(i));
			}

			n_match++;
		}
	}

	/* Complete only if there are more characters known than
	   currently entered. */
	if (n_match && len < strlen(complete_cmd)) {
		el_deletestr(el, li->cursor - li->buffer);
		el_insertstr(el, complete_cmd);
		if (!complete_cmd_partial)
			el_insertstr(el, " ");

		return CC_REDISPLAY;
	}
	else if (tabbed) {
		int printed = 0;
		for (size_t i = 0; i < cmd_parser_n_cmd(); ++i) {
			len = li->lastchar - li->buffer;
			if (strncmp(cmd_parser_cmd(i), li->buffer, len) == 0) {
				plog_info("%-23s", cmd_parser_cmd(i));
				printed++;
			}
			if (printed == 4) {
				printed = 0;
				plog_info("\n");
			}
		}
		if (printed)
			plog_info("\n");
	}
	else {
		tabbed = 1;
	}

	return CC_REDISPLAY;
}

/* Returns non-zero if stdin is readable */
static int peek_stdin(void)
{
	int tmp;
	fd_set in_fd;
	struct timeval tv;

	tv.tv_sec = 0;
	tv.tv_usec = 10000;

	FD_ZERO(&in_fd);
	FD_SET(fileno(stdin), &in_fd);
	tmp = select(fileno(stdin) + 1, &in_fd, NULL, NULL, &tv);
	return FD_ISSET(fileno(stdin), &in_fd);
}

#ifdef HAVE_LIBEDIT_EL_RFUNC_T
static int do_get_char(EditLine *e, wchar_t *c)
#else
static int get_char(EditLine *e, char *c)
#endif
{
	*c = display_getch();

	/* If no characters have been entered, number keys switch the
	   screen and '0' resets stats. This is provided as a
	   fall-back in case F-keys do not function. The keys are
	   intercepted before returning control to libedit. */
	if (*c >= '0' && *c <= '9') {
		const LineInfo *li;

		li = el_line(e);
		if (li->lastchar == li->buffer) {
			if (*c >= '1') {
				display_screen(*c - '0' - 1);
				return 0;
			}
			else {
				cmd_parser_parse("reset stats", &input_curses);
				return 0;
			}
		}
	}
	if (*c == '=') {
		toggle_display_screen();
		return 0;
	}

	/* Escape by itself is the first character used for more
	   complex escape sequences like F-keys. libedit can't be used
	   to detect both ESC as a unitary key and more complex
	   sequences starting ESC at the same time. */
	if (*c == 27 && !peek_stdin()) {
		quit();
		return 0;
	}
	else if (*c != 9) {
		tabbed = 0;
	}

	return 1;
}

#ifdef HAVE_LIBEDIT_EL_RFUNC_T
static el_rfunc_t get_char = &do_get_char;
#endif

static void proc_keyboard(struct input *input)
{
	const char *line;
	const LineInfo *li;
	HistEvent hist_event;
	int len;

	line = el_gets(el, &len);
	li = el_line(el);

	if (len == 0 || line == NULL) {
		display_cmd("", 0, 0);
		return;
	} else if (len > 0) {
		if (len == 1 && line[0] == '\n') {
			display_print_page();
			el_set(el, EL_UNBUFFERED, 0);
			el_set(el, EL_UNBUFFERED, 1);
			return;
		}
		if (line[len-1] == '\n') {
			if (hist) {
				history(hist, &hist_event, H_ENTER, line);
			}

			char *line2 = strndup(line, len);
			line2[len - 1] = 0; /* replace \n */
			cmd_parser_parse(line2, input);
			free(line2);

			el_set(el, EL_UNBUFFERED, 0);
			el_set(el, EL_UNBUFFERED, 1);
			display_cmd("", 0, 0);
			return;
		}
		if (line[len-1] == 4) {
			return; /* should quit*/
		}
	}
	else {
		if (errno) {
                       return;
		}
		display_cmd("", 0, 0);
		return;
	}
	display_cmd(line, len, li->cursor - li->buffer);
}

static int key_f1(__attribute__((unused)) int ch) {display_screen(0); return CC_REDISPLAY;}
static int key_f2(__attribute__((unused)) int ch) {display_screen(1); return CC_REDISPLAY;}
static int key_f3(__attribute__((unused)) int ch) {display_screen(2); return CC_REDISPLAY;}
static int key_f4(__attribute__((unused)) int ch) {display_screen(3); return CC_REDISPLAY;}
static int key_f5(__attribute__((unused)) int ch) {display_screen(4); return CC_REDISPLAY;}
static int key_f6(__attribute__((unused)) int ch) {display_screen(5); return CC_REDISPLAY;}
static int key_f7(__attribute__((unused)) int ch) {display_screen(6); return CC_REDISPLAY;}
static int key_f8(__attribute__((unused)) int ch) {display_screen(7); return CC_REDISPLAY;}
static int key_f9(__attribute__((unused)) int ch) {display_screen(8); return CC_REDISPLAY;}
static int key_f10(__attribute__((unused)) int ch) {display_screen(9); return CC_REDISPLAY;}
static int key_f11(__attribute__((unused)) int ch) {display_screen(10); return CC_REDISPLAY;}
static int key_f12(__attribute__((unused)) int ch) {display_screen(11); return CC_REDISPLAY;}

static int key_page_up(__attribute__((unused)) int ch) {display_page_up(); return CC_REDISPLAY;}
static int key_page_down(__attribute__((unused)) int ch) {display_page_down(); return CC_REDISPLAY;}

static void setup_el(void)
{
	int pty;
	FILE *dev_pty;
	HistEvent hist_event;

	/* Open a pseudo-terminal for use in libedit. This is required
	   since the library checks if it is using a tty. If the file
	   descriptor does not represent a tty, the library disables
	   editing. */

	pty = posix_openpt(O_RDWR);
	/* TODO: On error (posix_openpt() < 0), fall-back to
	   non-libedit implementation. */
	grantpt(pty);
	unlockpt(pty);
	dev_pty = fdopen(pty, "wr");

	el = el_init("", dev_pty, dev_pty, dev_pty);

	el_set(el, EL_EDITOR, "emacs");

	el_set(el, EL_ADDFN, "complete", "Command completion", complete);

	el_set(el, EL_ADDFN, "key_f1", "Switch to screen 1", key_f1);
	el_set(el, EL_ADDFN, "key_f2", "Switch to screen 2", key_f2);
	el_set(el, EL_ADDFN, "key_f3", "Switch to screen 3", key_f3);
	el_set(el, EL_ADDFN, "key_f4", "Switch to screen 4", key_f4);
	el_set(el, EL_ADDFN, "key_f5", "Switch to screen 5", key_f5);
	el_set(el, EL_ADDFN, "key_f6", "Switch to screen 6", key_f6);
	el_set(el, EL_ADDFN, "key_f7", "Switch to screen 7", key_f7);
	el_set(el, EL_ADDFN, "key_f8", "Switch to screen 8", key_f8);
	el_set(el, EL_ADDFN, "key_f9", "Switch to screen 9", key_f5);
	el_set(el, EL_ADDFN, "key_f10", "Switch to screen 10", key_f6);
	el_set(el, EL_ADDFN, "key_f11", "Switch to screen 11", key_f7);
	el_set(el, EL_ADDFN, "key_f12", "Switch to screen 12", key_f8);

	el_set(el, EL_ADDFN, "key_page_up", "Page up", key_page_up);
	el_set(el, EL_ADDFN, "key_page_down", "Page down", key_page_down);

	el_set(el, EL_BIND, "^I", "complete", NULL);
	el_set(el, EL_BIND, "^r", "em-inc-search-prev", NULL);

	el_set(el, EL_BIND, "^[[11~", "key_f1", NULL);
	el_set(el, EL_BIND, "^[[12~", "key_f2", NULL);
	el_set(el, EL_BIND, "^[[13~", "key_f3", NULL);
	el_set(el, EL_BIND, "^[[14~", "key_f4", NULL);
	el_set(el, EL_BIND, "^[[15~", "key_f5", NULL);
	el_set(el, EL_BIND, "^[[17~", "key_f6", NULL);
	el_set(el, EL_BIND, "^[[18~", "key_f7", NULL);
	el_set(el, EL_BIND, "^[[19~", "key_f8", NULL);
	el_set(el, EL_BIND, "^[[20~", "key_f9", NULL);
	el_set(el, EL_BIND, "^[[21~", "key_f10", NULL);
	el_set(el, EL_BIND, "^[[23~", "key_f11", NULL);
	el_set(el, EL_BIND, "^[[24~", "key_f12", NULL);

	el_set(el, EL_BIND, "^[OP", "key_f1", NULL);
	el_set(el, EL_BIND, "^[OQ", "key_f2", NULL);
	el_set(el, EL_BIND, "^[OR", "key_f3", NULL);
	el_set(el, EL_BIND, "^[OS", "key_f4", NULL);

	el_set(el, EL_BIND, "^[[5~", "key_page_up", NULL);
	el_set(el, EL_BIND, "^[[6~", "key_page_down", NULL);

	hist = history_init();
	if (hist) {
		history(hist, &hist_event, H_SETSIZE, 1000);
		el_set(el, EL_HIST, history, hist);
	}
	el_set(el, EL_UNBUFFERED, 1);
	el_set(el, EL_GETCFN, get_char);
}

void reg_input_curses(void)
{
	setup_el();

	input_curses.fd = fileno(stdin);
	input_curses.proc_input = proc_keyboard;
	input_curses.history = show_history;

	reg_input(&input_curses);
}

void unreg_input_curses(void)
{
	history_end(hist);
	el_end(el);

	unreg_input(&input_curses);
}