[u-boot.git] / common / cli_readline.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, [email protected].
 *
 * Add to readline cmdline-editing by
 * (C) Copyright 2005
 * JinHua Luo, GuangDong Linux Center, <[email protected]>
 */

#include <common.h>
#include <bootretry.h>
#include <cli.h>
#include <watchdog.h>

DECLARE_GLOBAL_DATA_PTR;

static const char erase_seq[] = "\b \b";	/* erase sequence */
static const char   tab_seq[] = "        ";	/* used to expand TABs */

char console_buffer[CONFIG_SYS_CBSIZE + 1];	/* console I/O buffer	*/

static char *delete_char (char *buffer, char *p, int *colp, int *np, int plen)
{
	char *s;

	if (*np == 0)
		return p;

	if (*(--p) == '\t') {		/* will retype the whole line */
		while (*colp > plen) {
			puts(erase_seq);
			(*colp)--;
		}
		for (s = buffer; s < p; ++s) {
			if (*s == '\t') {
				puts(tab_seq + ((*colp) & 07));
				*colp += 8 - ((*colp) & 07);
			} else {
				++(*colp);
				putc(*s);
			}
		}
	} else {
		puts(erase_seq);
		(*colp)--;
	}
	(*np)--;

	return p;
}

#ifdef CONFIG_CMDLINE_EDITING

/*
 * cmdline-editing related codes from vivi.
 * Author: Janghoon Lyu <[email protected]>
 */

#define putnstr(str, n)	printf("%.*s", (int)n, str)

#define CTL_CH(c)		((c) - 'a' + 1)
#define CTL_BACKSPACE		('\b')
#define DEL			((char)255)
#define DEL7			((char)127)
#define CREAD_HIST_CHAR		('!')

#define getcmd_putch(ch)	putc(ch)
#define getcmd_getch()		getc()
#define getcmd_cbeep()		getcmd_putch('\a')

#define HIST_MAX		20
#define HIST_SIZE		CONFIG_SYS_CBSIZE

static int hist_max;
static int hist_add_idx;
static int hist_cur = -1;
static unsigned hist_num;

static char *hist_list[HIST_MAX];
static char hist_lines[HIST_MAX][HIST_SIZE + 1];	/* Save room for NULL */

#define add_idx_minus_one() ((hist_add_idx == 0) ? hist_max : hist_add_idx-1)

static void hist_init(void)
{
	int i;

	hist_max = 0;
	hist_add_idx = 0;
	hist_cur = -1;
	hist_num = 0;

	for (i = 0; i < HIST_MAX; i++) {
		hist_list[i] = hist_lines[i];
		hist_list[i][0] = '\0';
	}
}

static void cread_add_to_hist(char *line)
{
	strcpy(hist_list[hist_add_idx], line);

	if (++hist_add_idx >= HIST_MAX)
		hist_add_idx = 0;

	if (hist_add_idx > hist_max)
		hist_max = hist_add_idx;

	hist_num++;
}

static char *hist_prev(void)
{
	char *ret;
	int old_cur;

	if (hist_cur < 0)
		return NULL;

	old_cur = hist_cur;
	if (--hist_cur < 0)
		hist_cur = hist_max;

	if (hist_cur == hist_add_idx) {
		hist_cur = old_cur;
		ret = NULL;
	} else {
		ret = hist_list[hist_cur];
	}

	return ret;
}

static char *hist_next(void)
{
	char *ret;

	if (hist_cur < 0)
		return NULL;

	if (hist_cur == hist_add_idx)
		return NULL;

	if (++hist_cur > hist_max)
		hist_cur = 0;

	if (hist_cur == hist_add_idx)
		ret = "";
	else
		ret = hist_list[hist_cur];

	return ret;
}

#ifndef CONFIG_CMDLINE_EDITING
static void cread_print_hist_list(void)
{
	int i;
	unsigned long n;

	n = hist_num - hist_max;

	i = hist_add_idx + 1;
	while (1) {
		if (i > hist_max)
			i = 0;
		if (i == hist_add_idx)
			break;
		printf("%s\n", hist_list[i]);
		n++;
		i++;
	}
}
#endif /* CONFIG_CMDLINE_EDITING */

#define BEGINNING_OF_LINE() {			\
	while (num) {				\
		getcmd_putch(CTL_BACKSPACE);	\
		num--;				\
	}					\
}

#define ERASE_TO_EOL() {				\
	if (num < eol_num) {				\
		printf("%*s", (int)(eol_num - num), ""); \
		do {					\
			getcmd_putch(CTL_BACKSPACE);	\
		} while (--eol_num > num);		\
	}						\
}

#define REFRESH_TO_EOL() {			\
	if (num < eol_num) {			\
		wlen = eol_num - num;		\
		putnstr(buf + num, wlen);	\
		num = eol_num;			\
	}					\
}

static void cread_add_char(char ichar, int insert, unsigned long *num,
	       unsigned long *eol_num, char *buf, unsigned long len)
{
	unsigned long wlen;

	/* room ??? */
	if (insert || *num == *eol_num) {
		if (*eol_num > len - 1) {
			getcmd_cbeep();
			return;
		}
		(*eol_num)++;
	}

	if (insert) {
		wlen = *eol_num - *num;
		if (wlen > 1)
			memmove(&buf[*num+1], &buf[*num], wlen-1);

		buf[*num] = ichar;
		putnstr(buf + *num, wlen);
		(*num)++;
		while (--wlen)
			getcmd_putch(CTL_BACKSPACE);
	} else {
		/* echo the character */
		wlen = 1;
		buf[*num] = ichar;
		putnstr(buf + *num, wlen);
		(*num)++;
	}
}

static void cread_add_str(char *str, int strsize, int insert,
			  unsigned long *num, unsigned long *eol_num,
			  char *buf, unsigned long len)
{
	while (strsize--) {
		cread_add_char(*str, insert, num, eol_num, buf, len);
		str++;
	}
}

static int cread_line(const char *const prompt, char *buf, unsigned int *len,
		int timeout)
{
	unsigned long num = 0;
	unsigned long eol_num = 0;
	unsigned long wlen;
	char ichar;
	int insert = 1;
	int esc_len = 0;
	char esc_save[8];
	int init_len = strlen(buf);
	int first = 1;

	if (init_len)
		cread_add_str(buf, init_len, 1, &num, &eol_num, buf, *len);

	while (1) {
		if (bootretry_tstc_timeout())
			return -2;	/* timed out */
		if (first && timeout) {
			uint64_t etime = endtick(timeout);

			while (!tstc()) {	/* while no incoming data */
				if (get_ticks() >= etime)
					return -2;	/* timed out */
				WATCHDOG_RESET();
			}
			first = 0;
		}

		ichar = getcmd_getch();

		if ((ichar == '\n') || (ichar == '\r')) {
			putc('\n');
			break;
		}

		/*
		 * handle standard linux xterm esc sequences for arrow key, etc.
		 */
		if (esc_len != 0) {
			enum { ESC_REJECT, ESC_SAVE, ESC_CONVERTED } act = ESC_REJECT;

			if (esc_len == 1) {
				if (ichar == '[' || ichar == 'O')
					act = ESC_SAVE;
			} else if (esc_len == 2) {
				switch (ichar) {
				case 'D':	/* <- key */
					ichar = CTL_CH('b');
					act = ESC_CONVERTED;
					break;	/* pass off to ^B handler */
				case 'C':	/* -> key */
					ichar = CTL_CH('f');
					act = ESC_CONVERTED;
					break;	/* pass off to ^F handler */
				case 'H':	/* Home key */
					ichar = CTL_CH('a');
					act = ESC_CONVERTED;
					break;	/* pass off to ^A handler */
				case 'F':	/* End key */
					ichar = CTL_CH('e');
					act = ESC_CONVERTED;
					break;	/* pass off to ^E handler */
				case 'A':	/* up arrow */
					ichar = CTL_CH('p');
					act = ESC_CONVERTED;
					break;	/* pass off to ^P handler */
				case 'B':	/* down arrow */
					ichar = CTL_CH('n');
					act = ESC_CONVERTED;
					break;	/* pass off to ^N handler */
				case '1':
				case '3':
				case '4':
				case '7':
				case '8':
					if (esc_save[1] == '[') {
						/* see if next character is ~ */
						act = ESC_SAVE;
					}
					break;
				}
			} else if (esc_len == 3) {
				if (ichar == '~') {
					switch (esc_save[2]) {
					case '3':	/* Delete key */
						ichar = CTL_CH('d');
						act = ESC_CONVERTED;
						break;	/* pass to ^D handler */
					case '1':	/* Home key */
					case '7':
						ichar = CTL_CH('a');
						act = ESC_CONVERTED;
						break;	/* pass to ^A handler */
					case '4':	/* End key */
					case '8':
						ichar = CTL_CH('e');
						act = ESC_CONVERTED;
						break;	/* pass to ^E handler */
					}
				}
			}

			switch (act) {
			case ESC_SAVE:
				esc_save[esc_len++] = ichar;
				continue;
			case ESC_REJECT:
				esc_save[esc_len++] = ichar;
				cread_add_str(esc_save, esc_len, insert,
					      &num, &eol_num, buf, *len);
				esc_len = 0;
				continue;
			case ESC_CONVERTED:
				esc_len = 0;
				break;
			}
		}

		switch (ichar) {
		case 0x1b:
			if (esc_len == 0) {
				esc_save[esc_len] = ichar;
				esc_len = 1;
			} else {
				puts("impossible condition #876\n");
				esc_len = 0;
			}
			break;

		case CTL_CH('a'):
			BEGINNING_OF_LINE();
			break;
		case CTL_CH('c'):	/* ^C - break */
			*buf = '\0';	/* discard input */
			return -1;
		case CTL_CH('f'):
			if (num < eol_num) {
				getcmd_putch(buf[num]);
				num++;
			}
			break;
		case CTL_CH('b'):
			if (num) {
				getcmd_putch(CTL_BACKSPACE);
				num--;
			}
			break;
		case CTL_CH('d'):
			if (num < eol_num) {
				wlen = eol_num - num - 1;
				if (wlen) {
					memmove(&buf[num], &buf[num+1], wlen);
					putnstr(buf + num, wlen);
				}

				getcmd_putch(' ');
				do {
					getcmd_putch(CTL_BACKSPACE);
				} while (wlen--);
				eol_num--;
			}
			break;
		case CTL_CH('k'):
			ERASE_TO_EOL();
			break;
		case CTL_CH('e'):
			REFRESH_TO_EOL();
			break;
		case CTL_CH('o'):
			insert = !insert;
			break;
		case CTL_CH('x'):
		case CTL_CH('u'):
			BEGINNING_OF_LINE();
			ERASE_TO_EOL();
			break;
		case DEL:
		case DEL7:
		case 8:
			if (num) {
				wlen = eol_num - num;
				num--;
				memmove(&buf[num], &buf[num+1], wlen);
				getcmd_putch(CTL_BACKSPACE);
				putnstr(buf + num, wlen);
				getcmd_putch(' ');
				do {
					getcmd_putch(CTL_BACKSPACE);
				} while (wlen--);
				eol_num--;
			}
			break;
		case CTL_CH('p'):
		case CTL_CH('n'):
		{
			char *hline;

			esc_len = 0;

			if (ichar == CTL_CH('p'))
				hline = hist_prev();
			else
				hline = hist_next();

			if (!hline) {
				getcmd_cbeep();
				continue;
			}

			/* nuke the current line */
			/* first, go home */
			BEGINNING_OF_LINE();

			/* erase to end of line */
			ERASE_TO_EOL();

			/* copy new line into place and display */
			strcpy(buf, hline);
			eol_num = strlen(buf);
			REFRESH_TO_EOL();
			continue;
		}
#ifdef CONFIG_AUTO_COMPLETE
		case '\t': {
			int num2, col;

			/* do not autocomplete when in the middle */
			if (num < eol_num) {
				getcmd_cbeep();
				break;
			}

			buf[num] = '\0';
			col = strlen(prompt) + eol_num;
			num2 = num;
			if (cmd_auto_complete(prompt, buf, &num2, &col)) {
				col = num2 - num;
				num += col;
				eol_num += col;
			}
			break;
		}
#endif
		default:
			cread_add_char(ichar, insert, &num, &eol_num, buf,
				       *len);
			break;
		}
	}
	*len = eol_num;
	buf[eol_num] = '\0';	/* lose the newline */

	if (buf[0] && buf[0] != CREAD_HIST_CHAR)
		cread_add_to_hist(buf);
	hist_cur = hist_add_idx;

	return 0;
}

#endif /* CONFIG_CMDLINE_EDITING */

/****************************************************************************/

int cli_readline(const char *const prompt)
{
	/*
	 * If console_buffer isn't 0-length the user will be prompted to modify
	 * it instead of entering it from scratch as desired.
	 */
	console_buffer[0] = '\0';

	return cli_readline_into_buffer(prompt, console_buffer, 0);
}


int cli_readline_into_buffer(const char *const prompt, char *buffer,
			     int timeout)
{
	char *p = buffer;
#ifdef CONFIG_CMDLINE_EDITING
	unsigned int len = CONFIG_SYS_CBSIZE;
	int rc;
	static int initted;

	/*
	 * History uses a global array which is not
	 * writable until after relocation to RAM.
	 * Revert to non-history version if still
	 * running from flash.
	 */
	if (gd->flags & GD_FLG_RELOC) {
		if (!initted) {
			hist_init();
			initted = 1;
		}

		if (prompt)
			puts(prompt);

		rc = cread_line(prompt, p, &len, timeout);
		return rc < 0 ? rc : len;

	} else {
#endif	/* CONFIG_CMDLINE_EDITING */
	char *p_buf = p;
	int	n = 0;				/* buffer index		*/
	int	plen = 0;			/* prompt length	*/
	int	col;				/* output column cnt	*/
	char	c;

	/* print prompt */
	if (prompt) {
		plen = strlen(prompt);
		puts(prompt);
	}
	col = plen;

	for (;;) {
		if (bootretry_tstc_timeout())
			return -2;	/* timed out */
		WATCHDOG_RESET();	/* Trigger watchdog, if needed */

#ifdef CONFIG_SHOW_ACTIVITY
		while (!tstc()) {
			show_activity(0);
			WATCHDOG_RESET();
		}
#endif
		c = getc();

		/*
		 * Special character handling
		 */
		switch (c) {
		case '\r':			/* Enter		*/
		case '\n':
			*p = '\0';
			puts("\r\n");
			return p - p_buf;

		case '\0':			/* nul			*/
			continue;

		case 0x03:			/* ^C - break		*/
			p_buf[0] = '\0';	/* discard input */
			return -1;

		case 0x15:			/* ^U - erase line	*/
			while (col > plen) {
				puts(erase_seq);
				--col;
			}
			p = p_buf;
			n = 0;
			continue;

		case 0x17:			/* ^W - erase word	*/
			p = delete_char(p_buf, p, &col, &n, plen);
			while ((n > 0) && (*p != ' '))
				p = delete_char(p_buf, p, &col, &n, plen);
			continue;

		case 0x08:			/* ^H  - backspace	*/
		case 0x7F:			/* DEL - backspace	*/
			p = delete_char(p_buf, p, &col, &n, plen);
			continue;

		default:
			/*
			 * Must be a normal character then
			 */
			if (n < CONFIG_SYS_CBSIZE-2) {
				if (c == '\t') {	/* expand TABs */
#ifdef CONFIG_AUTO_COMPLETE
					/*
					 * if auto completion triggered just
					 * continue
					 */
					*p = '\0';
					if (cmd_auto_complete(prompt,
							      console_buffer,
							      &n, &col)) {
						p = p_buf + n;	/* reset */
						continue;
					}
#endif
					puts(tab_seq + (col & 07));
					col += 8 - (col & 07);
				} else {
					char __maybe_unused buf[2];

					/*
					 * Echo input using puts() to force an
					 * LCD flush if we are using an LCD
					 */
					++col;
					buf[0] = c;
					buf[1] = '\0';
					puts(buf);
				}
				*p++ = c;
				++n;
			} else {			/* Buffer full */
				putc('\a');
			}
		}
	}
#ifdef CONFIG_CMDLINE_EDITING
	}
#endif
}
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
6493ccc7 SG	2	/*
	3	* (C) Copyright 2000
	4	* Wolfgang Denk, DENX Software Engineering, [email protected].
	5	*
	6	* Add to readline cmdline-editing by
	7	* (C) Copyright 2005
	8	* JinHua Luo, GuangDong Linux Center, <[email protected]>
6493ccc7 SG	9	*/
	10
	11	#include <common.h>
0098e179	12	#include <bootretry.h>
6493ccc7 SG	13	#include <cli.h>
	14	#include <watchdog.h>
	15
	16	DECLARE_GLOBAL_DATA_PTR;
	17
	18	static const char erase_seq[] = "\b \b"; /* erase sequence */
	19	static const char tab_seq[] = " "; /* used to expand TABs */
	20
6493ccc7 SG	21	char console_buffer[CONFIG_SYS_CBSIZE + 1]; /* console I/O buffer */
6493ccc7 SG	22
6493ccc7 SG	23	static char delete_char (char buffer, char p, int colp, int *np, int plen)
	24	{
	25	char *s;
	26
	27	if (*np == 0)
	28	return p;
	29
	30	if ((--p) == '\t') { / will retype the whole line */
	31	while (*colp > plen) {
	32	puts(erase_seq);
	33	(*colp)--;
	34	}
	35	for (s = buffer; s < p; ++s) {
	36	if (*s == '\t') {
	37	puts(tab_seq + ((*colp) & 07));
	38	colp += 8 - ((colp) & 07);
	39	} else {
	40	++(*colp);
	41	putc(*s);
	42	}
	43	}
	44	} else {
	45	puts(erase_seq);
	46	(*colp)--;
	47	}
	48	(*np)--;
	49
	50	return p;
	51	}
	52
	53	#ifdef CONFIG_CMDLINE_EDITING
	54
	55	/*
	56	* cmdline-editing related codes from vivi.
	57	* Author: Janghoon Lyu <[email protected]>
	58	*/
	59
	60	#define putnstr(str, n) printf("%.*s", (int)n, str)
	61
	62	#define CTL_CH(c) ((c) - 'a' + 1)
	63	#define CTL_BACKSPACE ('\b')
	64	#define DEL ((char)255)
	65	#define DEL7 ((char)127)
	66	#define CREAD_HIST_CHAR ('!')
	67
	68	#define getcmd_putch(ch) putc(ch)
	69	#define getcmd_getch() getc()
	70	#define getcmd_cbeep() getcmd_putch('\a')
	71
	72	#define HIST_MAX 20
	73	#define HIST_SIZE CONFIG_SYS_CBSIZE
	74
	75	static int hist_max;
	76	static int hist_add_idx;
	77	static int hist_cur = -1;
	78	static unsigned hist_num;
	79
	80	static char *hist_list[HIST_MAX];
	81	static char hist_lines[HIST_MAX][HIST_SIZE + 1]; /* Save room for NULL */
	82
	83	#define add_idx_minus_one() ((hist_add_idx == 0) ? hist_max : hist_add_idx-1)
	84
	85	static void hist_init(void)
	86	{
87	int i;
88
89	hist_max = 0;
90	hist_add_idx = 0;
91	hist_cur = -1;
92	hist_num = 0;
93
94	for (i = 0; i < HIST_MAX; i++) {
95	hist_list[i] = hist_lines[i];
96	hist_list[i][0] = '\0';
97	}
98	}
99
100	static void cread_add_to_hist(char *line)
101	{
102	strcpy(hist_list[hist_add_idx], line);
103
104	if (++hist_add_idx >= HIST_MAX)
105	hist_add_idx = 0;
106
107	if (hist_add_idx > hist_max)
108	hist_max = hist_add_idx;
109
110	hist_num++;
111	}
112
113	static char *hist_prev(void)
114	{
115	char *ret;
116	int old_cur;
117
118	if (hist_cur < 0)
119	return NULL;
120
121	old_cur = hist_cur;
122	if (--hist_cur < 0)
123	hist_cur = hist_max;
124
125	if (hist_cur == hist_add_idx) {
126	hist_cur = old_cur;
127	ret = NULL;
128	} else {
129	ret = hist_list[hist_cur];
130	}
131
132	return ret;
133	}
134
135	static char *hist_next(void)
136	{
137	char *ret;
138
139	if (hist_cur < 0)
140	return NULL;
141
142	if (hist_cur == hist_add_idx)
143	return NULL;
144
145	if (++hist_cur > hist_max)
146	hist_cur = 0;
147
148	if (hist_cur == hist_add_idx)
149	ret = "";
150	else
151	ret = hist_list[hist_cur];
152
153	return ret;
154	}
155
156	#ifndef CONFIG_CMDLINE_EDITING
157	static void cread_print_hist_list(void)
158	{
159	int i;
160	unsigned long n;
161
162	n = hist_num - hist_max;
163
164	i = hist_add_idx + 1;
165	while (1) {
166	if (i > hist_max)
167	i = 0;
168	if (i == hist_add_idx)
169	break;
170	printf("%s\n", hist_list[i]);
171	n++;
172	i++;
173	}
174	}
175	#endif /* CONFIG_CMDLINE_EDITING */
176
177	#define BEGINNING_OF_LINE() { \
178	while (num) { \
179	getcmd_putch(CTL_BACKSPACE); \
180	num--; \
181	} \
182	}
183
184	#define ERASE_TO_EOL() { \
185	if (num < eol_num) { \
186	printf("%*s", (int)(eol_num - num), ""); \
187	do { \
188	getcmd_putch(CTL_BACKSPACE); \
189	} while (--eol_num > num); \
190	} \
191	}
192
193	#define REFRESH_TO_EOL() { \
194	if (num < eol_num) { \
195	wlen = eol_num - num; \
196	putnstr(buf + num, wlen); \
197	num = eol_num; \
198	} \
199	}
200
201	static void cread_add_char(char ichar, int insert, unsigned long *num,
202	unsigned long eol_num, char buf, unsigned long len)
203	{
204	unsigned long wlen;
205
206	/* room ??? */
207	if (insert \|\| num == eol_num) {
208	if (*eol_num > len - 1) {
209	getcmd_cbeep();
210	return;
211	}
212	(*eol_num)++;
213	}
214
215	if (insert) {
216	wlen = eol_num - num;
217	if (wlen > 1)
218	memmove(&buf[num+1], &buf[num], wlen-1);
219
220	buf[*num] = ichar;
221	putnstr(buf + *num, wlen);
222	(*num)++;
223	while (--wlen)
224	getcmd_putch(CTL_BACKSPACE);
225	} else {
226	/* echo the character */
227	wlen = 1;
228	buf[*num] = ichar;
229	putnstr(buf + *num, wlen);
230	(*num)++;
231	}
232	}
233
234	static void cread_add_str(char *str, int strsize, int insert,
235	unsigned long num, unsigned long eol_num,
236	char *buf, unsigned long len)
237	{
238	while (strsize--) {
239	cread_add_char(*str, insert, num, eol_num, buf, len);
240	str++;
241	}
242	}
243
244	static int cread_line(const char const prompt, char buf, unsigned int *len,
245	int timeout)
246	{
247	unsigned long num = 0;
248	unsigned long eol_num = 0;
249	unsigned long wlen;
250	char ichar;
251	int insert = 1;
252	int esc_len = 0;
253	char esc_save[8];
254	int init_len = strlen(buf);
255	int first = 1;
256
257	if (init_len)
258	cread_add_str(buf, init_len, 1, &num, &eol_num, buf, *len);
259
260	while (1) {
0098e179 SG	261	if (bootretry_tstc_timeout())
0098e179 SG	262	return -2; /* timed out */
6493ccc7 SG	263	if (first && timeout) {
	264	uint64_t etime = endtick(timeout);
	265
	266	while (!tstc()) { /* while no incoming data */
	267	if (get_ticks() >= etime)
	268	return -2; /* timed out */
	269	WATCHDOG_RESET();
	270	}
	271	first = 0;
	272	}
	273
	274	ichar = getcmd_getch();
	275
	276	if ((ichar == '\n') \|\| (ichar == '\r')) {
	277	putc('\n');
	278	break;
	279	}
	280
	281	/*
	282	* handle standard linux xterm esc sequences for arrow key, etc.
	283	*/
	284	if (esc_len != 0) {
fc18e9b3 JB	285	enum { ESC_REJECT, ESC_SAVE, ESC_CONVERTED } act = ESC_REJECT;
fc18e9b3 JB	286
6493ccc7	287	if (esc_len == 1) {
fc18e9b3 JB	288	if (ichar == '[' \|\| ichar == 'O')
	289	act = ESC_SAVE;
	290	} else if (esc_len == 2) {
	291	switch (ichar) {
	292	case 'D': /* <- key */
	293	ichar = CTL_CH('b');
	294	act = ESC_CONVERTED;
	295	break; /* pass off to ^B handler */
	296	case 'C': /* -> key */
	297	ichar = CTL_CH('f');
	298	act = ESC_CONVERTED;
	299	break; /* pass off to ^F handler */
	300	case 'H': /* Home key */
	301	ichar = CTL_CH('a');
	302	act = ESC_CONVERTED;
	303	break; /* pass off to ^A handler */
	304	case 'F': /* End key */
	305	ichar = CTL_CH('e');
	306	act = ESC_CONVERTED;
	307	break; /* pass off to ^E handler */
	308	case 'A': /* up arrow */
	309	ichar = CTL_CH('p');
	310	act = ESC_CONVERTED;
	311	break; /* pass off to ^P handler */
	312	case 'B': /* down arrow */
	313	ichar = CTL_CH('n');
	314	act = ESC_CONVERTED;
	315	break; /* pass off to ^N handler */
	316	case '1':
	317	case '3':
	318	case '4':
	319	case '7':
	320	case '8':
	321	if (esc_save[1] == '[') {
	322	/* see if next character is ~ */
	323	act = ESC_SAVE;
	324	}
	325	break;
	326	}
	327	} else if (esc_len == 3) {
	328	if (ichar == '~') {
	329	switch (esc_save[2]) {
	330	case '3': /* Delete key */
	331	ichar = CTL_CH('d');
	332	act = ESC_CONVERTED;
	333	break; /* pass to ^D handler */
	334	case '1': /* Home key */
	335	case '7':
	336	ichar = CTL_CH('a');
	337	act = ESC_CONVERTED;
	338	break; /* pass to ^A handler */
	339	case '4': /* End key */
	340	case '8':
	341	ichar = CTL_CH('e');
	342	act = ESC_CONVERTED;
	343	break; /* pass to ^E handler */
	344	}
6493ccc7	345	}
6493ccc7 SG	346	}
6493ccc7 SG	347
fc18e9b3 JB	348	switch (act) {
	349	case ESC_SAVE:
	350	esc_save[esc_len++] = ichar;
	351	continue;
	352	case ESC_REJECT:
6493ccc7 SG	353	esc_save[esc_len++] = ichar;
	354	cread_add_str(esc_save, esc_len, insert,
	355	&num, &eol_num, buf, *len);
	356	esc_len = 0;
	357	continue;
fc18e9b3 JB	358	case ESC_CONVERTED:
	359	esc_len = 0;
	360	break;
6493ccc7 SG	361	}
	362	}
	363
	364	switch (ichar) {
	365	case 0x1b:
	366	if (esc_len == 0) {
	367	esc_save[esc_len] = ichar;
	368	esc_len = 1;
	369	} else {
	370	puts("impossible condition #876\n");
	371	esc_len = 0;
	372	}
	373	break;
	374
	375	case CTL_CH('a'):
	376	BEGINNING_OF_LINE();
	377	break;
	378	case CTL_CH('c'): /* ^C - break */
	379	buf = '\0'; / discard input */
	380	return -1;
	381	case CTL_CH('f'):
	382	if (num < eol_num) {
	383	getcmd_putch(buf[num]);
	384	num++;
	385	}
	386	break;
	387	case CTL_CH('b'):
	388	if (num) {
	389	getcmd_putch(CTL_BACKSPACE);
	390	num--;
	391	}
	392	break;
	393	case CTL_CH('d'):
	394	if (num < eol_num) {
	395	wlen = eol_num - num - 1;
	396	if (wlen) {
	397	memmove(&buf[num], &buf[num+1], wlen);
	398	putnstr(buf + num, wlen);
	399	}
	400
	401	getcmd_putch(' ');
	402	do {
	403	getcmd_putch(CTL_BACKSPACE);
	404	} while (wlen--);
	405	eol_num--;
	406	}
	407	break;
	408	case CTL_CH('k'):
	409	ERASE_TO_EOL();
	410	break;
	411	case CTL_CH('e'):
	412	REFRESH_TO_EOL();
	413	break;
	414	case CTL_CH('o'):
	415	insert = !insert;
	416	break;
	417	case CTL_CH('x'):
	418	case CTL_CH('u'):
	419	BEGINNING_OF_LINE();
	420	ERASE_TO_EOL();
	421	break;
	422	case DEL:
	423	case DEL7:
	424	case 8:
425	if (num) {
426	wlen = eol_num - num;
427	num--;
428	memmove(&buf[num], &buf[num+1], wlen);
429	getcmd_putch(CTL_BACKSPACE);
430	putnstr(buf + num, wlen);
431	getcmd_putch(' ');
432	do {
433	getcmd_putch(CTL_BACKSPACE);
434	} while (wlen--);
435	eol_num--;
436	}
437	break;
438	case CTL_CH('p'):
439	case CTL_CH('n'):
440	{
441	char *hline;
442
443	esc_len = 0;
444
445	if (ichar == CTL_CH('p'))
446	hline = hist_prev();
447	else
448	hline = hist_next();
449
450	if (!hline) {
451	getcmd_cbeep();
452	continue;
453	}
454
455	/* nuke the current line */
456	/* first, go home */
457	BEGINNING_OF_LINE();
458
459	/* erase to end of line */
460	ERASE_TO_EOL();
461
462	/* copy new line into place and display */
463	strcpy(buf, hline);
464	eol_num = strlen(buf);
465	REFRESH_TO_EOL();
466	continue;
467	}
468	#ifdef CONFIG_AUTO_COMPLETE
469	case '\t': {
470	int num2, col;
471
472	/* do not autocomplete when in the middle */
473	if (num < eol_num) {
474	getcmd_cbeep();
475	break;
476	}
477
478	buf[num] = '\0';
479	col = strlen(prompt) + eol_num;
480	num2 = num;
481	if (cmd_auto_complete(prompt, buf, &num2, &col)) {
482	col = num2 - num;
483	num += col;
484	eol_num += col;
485	}
486	break;
487	}
488	#endif
489	default:
490	cread_add_char(ichar, insert, &num, &eol_num, buf,
491	*len);
492	break;
493	}
494	}
495	*len = eol_num;
496	buf[eol_num] = '\0'; /* lose the newline */
497
498	if (buf[0] && buf[0] != CREAD_HIST_CHAR)
499	cread_add_to_hist(buf);
500	hist_cur = hist_add_idx;
501
502	return 0;
503	}
504
505	#endif /* CONFIG_CMDLINE_EDITING */
506
507	/****************************************************************************/
508
e1bf824d	509	int cli_readline(const char *const prompt)
6493ccc7 SG	510	{
	511	/*
	512	* If console_buffer isn't 0-length the user will be prompted to modify
	513	* it instead of entering it from scratch as desired.
	514	*/
	515	console_buffer[0] = '\0';
	516
e1bf824d	517	return cli_readline_into_buffer(prompt, console_buffer, 0);
6493ccc7 SG	518	}
	519
	520
e1bf824d SG	521	int cli_readline_into_buffer(const char const prompt, char buffer,
e1bf824d SG	522	int timeout)
6493ccc7 SG	523	{
	524	char *p = buffer;
	525	#ifdef CONFIG_CMDLINE_EDITING
	526	unsigned int len = CONFIG_SYS_CBSIZE;
	527	int rc;
	528	static int initted;
	529
	530	/*
	531	* History uses a global array which is not
	532	* writable until after relocation to RAM.
	533	* Revert to non-history version if still
	534	* running from flash.
	535	*/
	536	if (gd->flags & GD_FLG_RELOC) {
	537	if (!initted) {
	538	hist_init();
	539	initted = 1;
	540	}
	541
	542	if (prompt)
	543	puts(prompt);
	544
	545	rc = cread_line(prompt, p, &len, timeout);
	546	return rc < 0 ? rc : len;
	547
	548	} else {
	549	#endif /* CONFIG_CMDLINE_EDITING */
	550	char *p_buf = p;
	551	int n = 0; /* buffer index */
	552	int plen = 0; /* prompt length */
	553	int col; /* output column cnt */
	554	char c;
	555
	556	/* print prompt */
	557	if (prompt) {
	558	plen = strlen(prompt);
	559	puts(prompt);
	560	}
	561	col = plen;
	562
	563	for (;;) {
0098e179 SG	564	if (bootretry_tstc_timeout())
0098e179 SG	565	return -2; /* timed out */
6493ccc7 SG	566	WATCHDOG_RESET(); /* Trigger watchdog, if needed */
	567
	568	#ifdef CONFIG_SHOW_ACTIVITY
	569	while (!tstc()) {
	570	show_activity(0);
	571	WATCHDOG_RESET();
	572	}
	573	#endif
	574	c = getc();
	575
	576	/*
	577	* Special character handling
	578	*/
	579	switch (c) {
	580	case '\r': /* Enter */
	581	case '\n':
	582	*p = '\0';
	583	puts("\r\n");
	584	return p - p_buf;
	585
	586	case '\0': /* nul */
	587	continue;
	588
	589	case 0x03: /* ^C - break */
	590	p_buf[0] = '\0'; /* discard input */
	591	return -1;
	592
	593	case 0x15: /* ^U - erase line */
	594	while (col > plen) {
	595	puts(erase_seq);
	596	--col;
	597	}
	598	p = p_buf;
	599	n = 0;
	600	continue;
	601
	602	case 0x17: /* ^W - erase word */
	603	p = delete_char(p_buf, p, &col, &n, plen);
	604	while ((n > 0) && (*p != ' '))
	605	p = delete_char(p_buf, p, &col, &n, plen);
	606	continue;
	607
	608	case 0x08: /* ^H - backspace */
	609	case 0x7F: /* DEL - backspace */
	610	p = delete_char(p_buf, p, &col, &n, plen);
	611	continue;
	612
	613	default:
	614	/*
	615	* Must be a normal character then
	616	*/
	617	if (n < CONFIG_SYS_CBSIZE-2) {
	618	if (c == '\t') { /* expand TABs */
	619	#ifdef CONFIG_AUTO_COMPLETE
	620	/*
	621	* if auto completion triggered just
	622	* continue
	623	*/
	624	*p = '\0';
	625	if (cmd_auto_complete(prompt,
	626	console_buffer,
	627	&n, &col)) {
	628	p = p_buf + n; /* reset */
	629	continue;
630	}
631	#endif
632	puts(tab_seq + (col & 07));
633	col += 8 - (col & 07);
634	} else {
80402f34	635	char __maybe_unused buf[2];
6493ccc7 SG	636
	637	/*
	638	* Echo input using puts() to force an
	639	* LCD flush if we are using an LCD
	640	*/
	641	++col;
	642	buf[0] = c;
	643	buf[1] = '\0';
	644	puts(buf);
	645	}
	646	*p++ = c;
	647	++n;
	648	} else { /* Buffer full */
	649	putc('\a');
	650	}
	651	}
	652	}
	653	#ifdef CONFIG_CMDLINE_EDITING
	654	}
	655	#endif
	656	}