[qemu.git] / readline.c

/*
 * QEMU readline utility
 *
 * Copyright (c) 2003-2004 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "vl.h"

#define TERM_CMD_BUF_SIZE 4095
#define TERM_MAX_CMDS 64
#define NB_COMPLETIONS_MAX 256

#define IS_NORM 0
#define IS_ESC  1
#define IS_CSI  2

#define printf do_not_use_printf

static char term_cmd_buf[TERM_CMD_BUF_SIZE + 1];
static int term_cmd_buf_index;
static int term_cmd_buf_size;

static char term_last_cmd_buf[TERM_CMD_BUF_SIZE + 1];
static int term_last_cmd_buf_index;
static int term_last_cmd_buf_size;

static int term_esc_state;
static int term_esc_param;

static char *term_history[TERM_MAX_CMDS];
static int term_hist_entry = -1;

static int nb_completions;
int completion_index;
static char *completions[NB_COMPLETIONS_MAX];

static ReadLineFunc *term_readline_func;
static int term_is_password;
static char term_prompt[256];
static void *term_readline_opaque;

static void term_show_prompt2(void)
{
    term_printf("%s", term_prompt);
    term_flush();
    term_last_cmd_buf_index = 0;
    term_last_cmd_buf_size = 0;
    term_esc_state = IS_NORM;
}

static void term_show_prompt(void)
{
    term_show_prompt2();
    term_cmd_buf_index = 0;
    term_cmd_buf_size = 0;
}

/* update the displayed command line */
static void term_update(void)
{
    int i, delta, len;

    if (term_cmd_buf_size != term_last_cmd_buf_size ||
        memcmp(term_cmd_buf, term_last_cmd_buf, term_cmd_buf_size) != 0) {
        for(i = 0; i < term_last_cmd_buf_index; i++) {
            term_printf("\033[D");
        }
        term_cmd_buf[term_cmd_buf_size] = '\0';
        if (term_is_password) {
            len = strlen(term_cmd_buf);
            for(i = 0; i < len; i++)
                term_printf("*");
        } else {
            term_printf("%s", term_cmd_buf);
        }
        term_printf("\033[K");
        memcpy(term_last_cmd_buf, term_cmd_buf, term_cmd_buf_size);
        term_last_cmd_buf_size = term_cmd_buf_size;
        term_last_cmd_buf_index = term_cmd_buf_size;
    }
    if (term_cmd_buf_index != term_last_cmd_buf_index) {
        delta = term_cmd_buf_index - term_last_cmd_buf_index;
        if (delta > 0) {
            for(i = 0;i < delta; i++) {
                term_printf("\033[C");
            }
        } else {
            delta = -delta;
            for(i = 0;i < delta; i++) {
                term_printf("\033[D");
            }
        }
        term_last_cmd_buf_index = term_cmd_buf_index;
    }
    term_flush();
}

static void term_insert_char(int ch)
{
    if (term_cmd_buf_index < TERM_CMD_BUF_SIZE) {
        memmove(term_cmd_buf + term_cmd_buf_index + 1,
                term_cmd_buf + term_cmd_buf_index,
                term_cmd_buf_size - term_cmd_buf_index);
        term_cmd_buf[term_cmd_buf_index] = ch;
        term_cmd_buf_size++;
        term_cmd_buf_index++;
    }
}

static void term_backward_char(void)
{
    if (term_cmd_buf_index > 0) {
        term_cmd_buf_index--;
    }
}

static void term_forward_char(void)
{
    if (term_cmd_buf_index < term_cmd_buf_size) {
        term_cmd_buf_index++;
    }
}

static void term_delete_char(void)
{
    if (term_cmd_buf_index < term_cmd_buf_size) {
        memmove(term_cmd_buf + term_cmd_buf_index,
                term_cmd_buf + term_cmd_buf_index + 1,
                term_cmd_buf_size - term_cmd_buf_index - 1);
        term_cmd_buf_size--;
    }
}

static void term_backspace(void)
{
    if (term_cmd_buf_index > 0) {
        term_backward_char();
        term_delete_char();
    }
}

static void term_backword(void)
{
    int start;

    if (term_cmd_buf_index == 0 || term_cmd_buf_index > term_cmd_buf_size) {
        return;
    }

    start = term_cmd_buf_index - 1;

    /* find first word (backwards) */
    while (start > 0) {
        if (!isspace(term_cmd_buf[start])) {
            break;
        }

        --start;
    }

    /* find first space (backwards) */
    while (start > 0) {
        if (isspace(term_cmd_buf[start])) {
            ++start;
            break;
        }

        --start;
    }

    /* remove word */
    if (start < term_cmd_buf_index) {
        memmove(term_cmd_buf + start,
                term_cmd_buf + term_cmd_buf_index,
                term_cmd_buf_size - term_cmd_buf_index);
        term_cmd_buf_size -= term_cmd_buf_index - start;
        term_cmd_buf_index = start;
    }
}

static void term_bol(void)
{
    term_cmd_buf_index = 0;
}

static void term_eol(void)
{
    term_cmd_buf_index = term_cmd_buf_size;
}

static void term_up_char(void)
{
    int idx;

    if (term_hist_entry == 0)
	return;
    if (term_hist_entry == -1) {
	/* Find latest entry */
	for (idx = 0; idx < TERM_MAX_CMDS; idx++) {
	    if (term_history[idx] == NULL)
		break;
	}
	term_hist_entry = idx;
    }
    term_hist_entry--;
    if (term_hist_entry >= 0) {
	pstrcpy(term_cmd_buf, sizeof(term_cmd_buf),
                term_history[term_hist_entry]);
	term_cmd_buf_index = term_cmd_buf_size = strlen(term_cmd_buf);
    }
}

static void term_down_char(void)
{
    if (term_hist_entry == TERM_MAX_CMDS - 1 || term_hist_entry == -1)
	return;
    if (term_history[++term_hist_entry] != NULL) {
	pstrcpy(term_cmd_buf, sizeof(term_cmd_buf),
                term_history[term_hist_entry]);
    } else {
	term_hist_entry = -1;
    }
    term_cmd_buf_index = term_cmd_buf_size = strlen(term_cmd_buf);
}

static void term_hist_add(const char *cmdline)
{
    char *hist_entry, *new_entry;
    int idx;

    if (cmdline[0] == '\0')
	return;
    new_entry = NULL;
    if (term_hist_entry != -1) {
	/* We were editing an existing history entry: replace it */
	hist_entry = term_history[term_hist_entry];
	idx = term_hist_entry;
	if (strcmp(hist_entry, cmdline) == 0) {
	    goto same_entry;
	}
    }
    /* Search cmdline in history buffers */
    for (idx = 0; idx < TERM_MAX_CMDS; idx++) {
	hist_entry = term_history[idx];
	if (hist_entry == NULL)
	    break;
	if (strcmp(hist_entry, cmdline) == 0) {
	same_entry:
	    new_entry = hist_entry;
	    /* Put this entry at the end of history */
	    memmove(&term_history[idx], &term_history[idx + 1],
		    &term_history[TERM_MAX_CMDS] - &term_history[idx + 1]);
	    term_history[TERM_MAX_CMDS - 1] = NULL;
	    for (; idx < TERM_MAX_CMDS; idx++) {
		if (term_history[idx] == NULL)
		    break;
	    }
	    break;
	}
    }
    if (idx == TERM_MAX_CMDS) {
	/* Need to get one free slot */
	free(term_history[0]);
	memcpy(term_history, &term_history[1],
	       &term_history[TERM_MAX_CMDS] - &term_history[1]);
	term_history[TERM_MAX_CMDS - 1] = NULL;
	idx = TERM_MAX_CMDS - 1;
    }
    if (new_entry == NULL)
	new_entry = strdup(cmdline);
    term_history[idx] = new_entry;
    term_hist_entry = -1;
}

/* completion support */

void add_completion(const char *str)
{
    if (nb_completions < NB_COMPLETIONS_MAX) {
        completions[nb_completions++] = qemu_strdup(str);
    }
}

static void term_completion(void)
{
    int len, i, j, max_width, nb_cols;
    char *cmdline;

    nb_completions = 0;

    cmdline = qemu_malloc(term_cmd_buf_index + 1);
    if (!cmdline)
        return;
    memcpy(cmdline, term_cmd_buf, term_cmd_buf_index);
    cmdline[term_cmd_buf_index] = '\0';
    readline_find_completion(cmdline);
    qemu_free(cmdline);

    /* no completion found */
    if (nb_completions <= 0)
        return;
    if (nb_completions == 1) {
        len = strlen(completions[0]);
        for(i = completion_index; i < len; i++) {
            term_insert_char(completions[0][i]);
        }
        /* extra space for next argument. XXX: make it more generic */
        if (len > 0 && completions[0][len - 1] != '/')
            term_insert_char(' ');
    } else {
        term_printf("\n");
        max_width = 0;
        for(i = 0; i < nb_completions; i++) {
            len = strlen(completions[i]);
            if (len > max_width)
                max_width = len;
        }
        max_width += 2;
        if (max_width < 10)
            max_width = 10;
        else if (max_width > 80)
            max_width = 80;
        nb_cols = 80 / max_width;
        j = 0;
        for(i = 0; i < nb_completions; i++) {
            term_printf("%-*s", max_width, completions[i]);
            if (++j == nb_cols || i == (nb_completions - 1)) {
                term_printf("\n");
                j = 0;
            }
        }
        term_show_prompt2();
    }
}

/* return true if command handled */
void readline_handle_byte(int ch)
{
    switch(term_esc_state) {
    case IS_NORM:
        switch(ch) {
        case 1:
            term_bol();
            break;
        case 4:
            term_delete_char();
            break;
        case 5:
            term_eol();
            break;
        case 9:
            term_completion();
            break;
        case 10:
        case 13:
            term_cmd_buf[term_cmd_buf_size] = '\0';
            if (!term_is_password)
                term_hist_add(term_cmd_buf);
            term_printf("\n");
            term_cmd_buf_index = 0;
            term_cmd_buf_size = 0;
            term_last_cmd_buf_index = 0;
            term_last_cmd_buf_size = 0;
            /* NOTE: readline_start can be called here */
            term_readline_func(term_readline_opaque, term_cmd_buf);
            break;
        case 23:
            /* ^W */
            term_backword();
            break;
        case 27:
            term_esc_state = IS_ESC;
            break;
        case 127:
        case 8:
            term_backspace();
            break;
	case 155:
            term_esc_state = IS_CSI;
	    break;
        default:
            if (ch >= 32) {
                term_insert_char(ch);
            }
            break;
        }
        break;
    case IS_ESC:
        if (ch == '[') {
            term_esc_state = IS_CSI;
            term_esc_param = 0;
        } else {
            term_esc_state = IS_NORM;
        }
        break;
    case IS_CSI:
        switch(ch) {
	case 'A':
	case 'F':
	    term_up_char();
	    break;
	case 'B':
	case 'E':
	    term_down_char();
	    break;
        case 'D':
            term_backward_char();
            break;
        case 'C':
            term_forward_char();
            break;
        case '0' ... '9':
            term_esc_param = term_esc_param * 10 + (ch - '0');
            goto the_end;
        case '~':
            switch(term_esc_param) {
            case 1:
                term_bol();
                break;
            case 3:
                term_delete_char();
                break;
            case 4:
                term_eol();
                break;
            }
            break;
        default:
            break;
        }
        term_esc_state = IS_NORM;
    the_end:
        break;
    }
    term_update();
}

void readline_start(const char *prompt, int is_password,
                    ReadLineFunc *readline_func, void *opaque)
{
    pstrcpy(term_prompt, sizeof(term_prompt), prompt);
    term_readline_func = readline_func;
    term_readline_opaque = opaque;
    term_is_password = is_password;
    term_show_prompt();
}

const char *readline_get_history(unsigned int index)
{
    if (index >= TERM_MAX_CMDS)
        return NULL;
    return term_history[index];
}
Commit	Line	Data
7e2515e8 FB	1	/*
7e2515e8 FB	2	* QEMU readline utility
5fafdf24	3	*
7e2515e8	4	* Copyright (c) 2003-2004 Fabrice Bellard
5fafdf24	5	*
7e2515e8 FB	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
	24	#include "vl.h"
	25
	26	#define TERM_CMD_BUF_SIZE 4095
	27	#define TERM_MAX_CMDS 64
	28	#define NB_COMPLETIONS_MAX 256
	29
	30	#define IS_NORM 0
	31	#define IS_ESC 1
	32	#define IS_CSI 2
	33
	34	#define printf do_not_use_printf
	35
	36	static char term_cmd_buf[TERM_CMD_BUF_SIZE + 1];
	37	static int term_cmd_buf_index;
	38	static int term_cmd_buf_size;
	39
	40	static char term_last_cmd_buf[TERM_CMD_BUF_SIZE + 1];
	41	static int term_last_cmd_buf_index;
	42	static int term_last_cmd_buf_size;
	43
	44	static int term_esc_state;
	45	static int term_esc_param;
	46
	47	static char *term_history[TERM_MAX_CMDS];
	48	static int term_hist_entry = -1;
	49
	50	static int nb_completions;
	51	int completion_index;
	52	static char *completions[NB_COMPLETIONS_MAX];
	53
	54	static ReadLineFunc *term_readline_func;
	55	static int term_is_password;
	56	static char term_prompt[256];
	57	static void *term_readline_opaque;
	58
	59	static void term_show_prompt2(void)
	60	{
	61	term_printf("%s", term_prompt);
	62	term_flush();
	63	term_last_cmd_buf_index = 0;
	64	term_last_cmd_buf_size = 0;
	65	term_esc_state = IS_NORM;
	66	}
	67
	68	static void term_show_prompt(void)
	69	{
70	term_show_prompt2();
71	term_cmd_buf_index = 0;
72	term_cmd_buf_size = 0;
73	}
74
75	/* update the displayed command line */
76	static void term_update(void)
77	{
78	int i, delta, len;
79
80	if (term_cmd_buf_size != term_last_cmd_buf_size \|\|
81	memcmp(term_cmd_buf, term_last_cmd_buf, term_cmd_buf_size) != 0) {
82	for(i = 0; i < term_last_cmd_buf_index; i++) {
83	term_printf("\033[D");
84	}
85	term_cmd_buf[term_cmd_buf_size] = '\0';
86	if (term_is_password) {
87	len = strlen(term_cmd_buf);
88	for(i = 0; i < len; i++)
89	term_printf("*");
90	} else {
91	term_printf("%s", term_cmd_buf);
92	}
93	term_printf("\033[K");
94	memcpy(term_last_cmd_buf, term_cmd_buf, term_cmd_buf_size);
95	term_last_cmd_buf_size = term_cmd_buf_size;
96	term_last_cmd_buf_index = term_cmd_buf_size;
97	}
98	if (term_cmd_buf_index != term_last_cmd_buf_index) {
99	delta = term_cmd_buf_index - term_last_cmd_buf_index;
100	if (delta > 0) {
101	for(i = 0;i < delta; i++) {
102	term_printf("\033[C");
103	}
104	} else {
105	delta = -delta;
106	for(i = 0;i < delta; i++) {
107	term_printf("\033[D");
108	}
109	}
110	term_last_cmd_buf_index = term_cmd_buf_index;
111	}
112	term_flush();
113	}
114
115	static void term_insert_char(int ch)
116	{
117	if (term_cmd_buf_index < TERM_CMD_BUF_SIZE) {
118	memmove(term_cmd_buf + term_cmd_buf_index + 1,
119	term_cmd_buf + term_cmd_buf_index,
120	term_cmd_buf_size - term_cmd_buf_index);
121	term_cmd_buf[term_cmd_buf_index] = ch;
122	term_cmd_buf_size++;
123	term_cmd_buf_index++;
124	}
125	}
126
127	static void term_backward_char(void)
128	{
129	if (term_cmd_buf_index > 0) {
130	term_cmd_buf_index--;
131	}
132	}
133
134	static void term_forward_char(void)
135	{
136	if (term_cmd_buf_index < term_cmd_buf_size) {
137	term_cmd_buf_index++;
138	}
139	}
140
141	static void term_delete_char(void)
142	{
143	if (term_cmd_buf_index < term_cmd_buf_size) {
144	memmove(term_cmd_buf + term_cmd_buf_index,
145	term_cmd_buf + term_cmd_buf_index + 1,
146	term_cmd_buf_size - term_cmd_buf_index - 1);
147	term_cmd_buf_size--;
148	}
149	}
150
151	static void term_backspace(void)
152	{
153	if (term_cmd_buf_index > 0) {
154	term_backward_char();
155	term_delete_char();
156	}
157	}
158
33fa11d4 TS	159	static void term_backword(void)
	160	{
	161	int start;
	162
	163	if (term_cmd_buf_index == 0 \|\| term_cmd_buf_index > term_cmd_buf_size) {
	164	return;
	165	}
	166
	167	start = term_cmd_buf_index - 1;
	168
	169	/* find first word (backwards) */
	170	while (start > 0) {
	171	if (!isspace(term_cmd_buf[start])) {
	172	break;
	173	}
	174
	175	--start;
	176	}
	177
	178	/* find first space (backwards) */
	179	while (start > 0) {
	180	if (isspace(term_cmd_buf[start])) {
	181	++start;
	182	break;
	183	}
	184
	185	--start;
	186	}
	187
	188	/* remove word */
	189	if (start < term_cmd_buf_index) {
	190	memmove(term_cmd_buf + start,
	191	term_cmd_buf + term_cmd_buf_index,
	192	term_cmd_buf_size - term_cmd_buf_index);
	193	term_cmd_buf_size -= term_cmd_buf_index - start;
	194	term_cmd_buf_index = start;
	195	}
	196	}
	197
7e2515e8 FB	198	static void term_bol(void)
	199	{
	200	term_cmd_buf_index = 0;
	201	}
	202
	203	static void term_eol(void)
	204	{
	205	term_cmd_buf_index = term_cmd_buf_size;
	206	}
	207
	208	static void term_up_char(void)
	209	{
	210	int idx;
	211
	212	if (term_hist_entry == 0)
	213	return;
	214	if (term_hist_entry == -1) {
	215	/* Find latest entry */
	216	for (idx = 0; idx < TERM_MAX_CMDS; idx++) {
	217	if (term_history[idx] == NULL)
	218	break;
	219	}
	220	term_hist_entry = idx;
	221	}
	222	term_hist_entry--;
	223	if (term_hist_entry >= 0) {
5fafdf24	224	pstrcpy(term_cmd_buf, sizeof(term_cmd_buf),
7e2515e8 FB	225	term_history[term_hist_entry]);
	226	term_cmd_buf_index = term_cmd_buf_size = strlen(term_cmd_buf);
	227	}
	228	}
	229
	230	static void term_down_char(void)
	231	{
	232	if (term_hist_entry == TERM_MAX_CMDS - 1 \|\| term_hist_entry == -1)
	233	return;
	234	if (term_history[++term_hist_entry] != NULL) {
	235	pstrcpy(term_cmd_buf, sizeof(term_cmd_buf),
	236	term_history[term_hist_entry]);
	237	} else {
	238	term_hist_entry = -1;
	239	}
	240	term_cmd_buf_index = term_cmd_buf_size = strlen(term_cmd_buf);
	241	}
	242
	243	static void term_hist_add(const char *cmdline)
	244	{
	245	char hist_entry, new_entry;
	246	int idx;
	247
	248	if (cmdline[0] == '\0')
	249	return;
	250	new_entry = NULL;
	251	if (term_hist_entry != -1) {
	252	/* We were editing an existing history entry: replace it */
	253	hist_entry = term_history[term_hist_entry];
	254	idx = term_hist_entry;
	255	if (strcmp(hist_entry, cmdline) == 0) {
	256	goto same_entry;
	257	}
	258	}
	259	/* Search cmdline in history buffers */
	260	for (idx = 0; idx < TERM_MAX_CMDS; idx++) {
	261	hist_entry = term_history[idx];
	262	if (hist_entry == NULL)
	263	break;
	264	if (strcmp(hist_entry, cmdline) == 0) {
	265	same_entry:
	266	new_entry = hist_entry;
	267	/* Put this entry at the end of history */
	268	memmove(&term_history[idx], &term_history[idx + 1],
	269	&term_history[TERM_MAX_CMDS] - &term_history[idx + 1]);
	270	term_history[TERM_MAX_CMDS - 1] = NULL;
	271	for (; idx < TERM_MAX_CMDS; idx++) {
	272	if (term_history[idx] == NULL)
	273	break;
	274	}
	275	break;
	276	}
	277	}
	278	if (idx == TERM_MAX_CMDS) {
	279	/* Need to get one free slot */
	280	free(term_history[0]);
	281	memcpy(term_history, &term_history[1],
	282	&term_history[TERM_MAX_CMDS] - &term_history[1]);
	283	term_history[TERM_MAX_CMDS - 1] = NULL;
	284	idx = TERM_MAX_CMDS - 1;
	285	}
	286	if (new_entry == NULL)
	287	new_entry = strdup(cmdline);
	288	term_history[idx] = new_entry;
289	term_hist_entry = -1;
290	}
291
292	/* completion support */
293
294	void add_completion(const char *str)
295	{
296	if (nb_completions < NB_COMPLETIONS_MAX) {
297	completions[nb_completions++] = qemu_strdup(str);
298	}
299	}
300
301	static void term_completion(void)
302	{
303	int len, i, j, max_width, nb_cols;
304	char *cmdline;
305
306	nb_completions = 0;
3b46e624	307
7e2515e8 FB	308	cmdline = qemu_malloc(term_cmd_buf_index + 1);
	309	if (!cmdline)
	310	return;
	311	memcpy(cmdline, term_cmd_buf, term_cmd_buf_index);
	312	cmdline[term_cmd_buf_index] = '\0';
	313	readline_find_completion(cmdline);
	314	qemu_free(cmdline);
	315
	316	/* no completion found */
	317	if (nb_completions <= 0)
	318	return;
	319	if (nb_completions == 1) {
	320	len = strlen(completions[0]);
	321	for(i = completion_index; i < len; i++) {
	322	term_insert_char(completions[0][i]);
	323	}
	324	/* extra space for next argument. XXX: make it more generic */
	325	if (len > 0 && completions[0][len - 1] != '/')
	326	term_insert_char(' ');
	327	} else {
	328	term_printf("\n");
	329	max_width = 0;
	330	for(i = 0; i < nb_completions; i++) {
	331	len = strlen(completions[i]);
	332	if (len > max_width)
	333	max_width = len;
	334	}
	335	max_width += 2;
	336	if (max_width < 10)
	337	max_width = 10;
	338	else if (max_width > 80)
	339	max_width = 80;
	340	nb_cols = 80 / max_width;
	341	j = 0;
	342	for(i = 0; i < nb_completions; i++) {
	343	term_printf("%-*s", max_width, completions[i]);
	344	if (++j == nb_cols \|\| i == (nb_completions - 1)) {
	345	term_printf("\n");
	346	j = 0;
	347	}
	348	}
	349	term_show_prompt2();
	350	}
	351	}
	352
	353	/* return true if command handled */
	354	void readline_handle_byte(int ch)
	355	{
	356	switch(term_esc_state) {
	357	case IS_NORM:
	358	switch(ch) {
	359	case 1:
	360	term_bol();
	361	break;
	362	case 4:
	363	term_delete_char();
	364	break;
	365	case 5:
	366	term_eol();
	367	break;
	368	case 9:
	369	term_completion();
	370	break;
	371	case 10:
372	case 13:
373	term_cmd_buf[term_cmd_buf_size] = '\0';
374	if (!term_is_password)
375	term_hist_add(term_cmd_buf);
376	term_printf("\n");
c92843b5 TS	377	term_cmd_buf_index = 0;
	378	term_cmd_buf_size = 0;
	379	term_last_cmd_buf_index = 0;
	380	term_last_cmd_buf_size = 0;
7e2515e8 FB	381	/* NOTE: readline_start can be called here */
	382	term_readline_func(term_readline_opaque, term_cmd_buf);
	383	break;
33fa11d4 TS	384	case 23:
	385	/* ^W */
	386	term_backword();
	387	break;
7e2515e8 FB	388	case 27:
	389	term_esc_state = IS_ESC;
	390	break;
	391	case 127:
	392	case 8:
	393	term_backspace();
	394	break;
	395	case 155:
	396	term_esc_state = IS_CSI;
	397	break;
	398	default:
	399	if (ch >= 32) {
	400	term_insert_char(ch);
	401	}
	402	break;
	403	}
	404	break;
	405	case IS_ESC:
	406	if (ch == '[') {
	407	term_esc_state = IS_CSI;
	408	term_esc_param = 0;
	409	} else {
	410	term_esc_state = IS_NORM;
	411	}
	412	break;
	413	case IS_CSI:
	414	switch(ch) {
	415	case 'A':
	416	case 'F':
	417	term_up_char();
	418	break;
	419	case 'B':
	420	case 'E':
	421	term_down_char();
	422	break;
	423	case 'D':
	424	term_backward_char();
	425	break;
	426	case 'C':
	427	term_forward_char();
	428	break;
	429	case '0' ... '9':
	430	term_esc_param = term_esc_param * 10 + (ch - '0');
	431	goto the_end;
	432	case '~':
	433	switch(term_esc_param) {
	434	case 1:
	435	term_bol();
	436	break;
	437	case 3:
	438	term_delete_char();
	439	break;
	440	case 4:
	441	term_eol();
	442	break;
	443	}
	444	break;
	445	default:
	446	break;
	447	}
	448	term_esc_state = IS_NORM;
	449	the_end:
	450	break;
	451	}
452	term_update();
453	}
454
455	void readline_start(const char *prompt, int is_password,
456	ReadLineFunc readline_func, void opaque)
457	{
458	pstrcpy(term_prompt, sizeof(term_prompt), prompt);
459	term_readline_func = readline_func;
460	term_readline_opaque = opaque;
461	term_is_password = is_password;
462	term_show_prompt();
463	}
464
465	const char *readline_get_history(unsigned int index)
466	{
467	if (index >= TERM_MAX_CMDS)
468	return NULL;
469	return term_history[index];
470	}
471
472