[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 "readline.h"
#include "monitor.h"

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

#define printf do_not_use_printf

void readline_show_prompt(ReadLineState *rs)
{
    monitor_printf(rs->mon, "%s", rs->prompt);
    monitor_flush(rs->mon);
    rs->last_cmd_buf_index = 0;
    rs->last_cmd_buf_size = 0;
    rs->esc_state = IS_NORM;
}

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

    if (rs->cmd_buf_size != rs->last_cmd_buf_size ||
        memcmp(rs->cmd_buf, rs->last_cmd_buf, rs->cmd_buf_size) != 0) {
        for(i = 0; i < rs->last_cmd_buf_index; i++) {
            monitor_printf(rs->mon, "\033[D");
        }
        rs->cmd_buf[rs->cmd_buf_size] = '\0';
        if (rs->read_password) {
            len = strlen(rs->cmd_buf);
            for(i = 0; i < len; i++)
                monitor_printf(rs->mon, "*");
        } else {
            monitor_printf(rs->mon, "%s", rs->cmd_buf);
        }
        monitor_printf(rs->mon, "\033[K");
        memcpy(rs->last_cmd_buf, rs->cmd_buf, rs->cmd_buf_size);
        rs->last_cmd_buf_size = rs->cmd_buf_size;
        rs->last_cmd_buf_index = rs->cmd_buf_size;
    }
    if (rs->cmd_buf_index != rs->last_cmd_buf_index) {
        delta = rs->cmd_buf_index - rs->last_cmd_buf_index;
        if (delta > 0) {
            for(i = 0;i < delta; i++) {
                monitor_printf(rs->mon, "\033[C");
            }
        } else {
            delta = -delta;
            for(i = 0;i < delta; i++) {
                monitor_printf(rs->mon, "\033[D");
            }
        }
        rs->last_cmd_buf_index = rs->cmd_buf_index;
    }
    monitor_flush(rs->mon);
}

static void readline_insert_char(ReadLineState *rs, int ch)
{
    if (rs->cmd_buf_index < READLINE_CMD_BUF_SIZE) {
        memmove(rs->cmd_buf + rs->cmd_buf_index + 1,
                rs->cmd_buf + rs->cmd_buf_index,
                rs->cmd_buf_size - rs->cmd_buf_index);
        rs->cmd_buf[rs->cmd_buf_index] = ch;
        rs->cmd_buf_size++;
        rs->cmd_buf_index++;
    }
}

static void readline_backward_char(ReadLineState *rs)
{
    if (rs->cmd_buf_index > 0) {
        rs->cmd_buf_index--;
    }
}

static void readline_forward_char(ReadLineState *rs)
{
    if (rs->cmd_buf_index < rs->cmd_buf_size) {
        rs->cmd_buf_index++;
    }
}

static void readline_delete_char(ReadLineState *rs)
{
    if (rs->cmd_buf_index < rs->cmd_buf_size) {
        memmove(rs->cmd_buf + rs->cmd_buf_index,
                rs->cmd_buf + rs->cmd_buf_index + 1,
                rs->cmd_buf_size - rs->cmd_buf_index - 1);
        rs->cmd_buf_size--;
    }
}

static void readline_backspace(ReadLineState *rs)
{
    if (rs->cmd_buf_index > 0) {
        readline_backward_char(rs);
        readline_delete_char(rs);
    }
}

static void readline_backword(ReadLineState *rs)
{
    int start;

    if (rs->cmd_buf_index == 0 || rs->cmd_buf_index > rs->cmd_buf_size) {
        return;
    }

    start = rs->cmd_buf_index - 1;

    /* find first word (backwards) */
    while (start > 0) {
        if (!qemu_isspace(rs->cmd_buf[start])) {
            break;
        }

        --start;
    }

    /* find first space (backwards) */
    while (start > 0) {
        if (qemu_isspace(rs->cmd_buf[start])) {
            ++start;
            break;
        }

        --start;
    }

    /* remove word */
    if (start < rs->cmd_buf_index) {
        memmove(rs->cmd_buf + start,
                rs->cmd_buf + rs->cmd_buf_index,
                rs->cmd_buf_size - rs->cmd_buf_index);
        rs->cmd_buf_size -= rs->cmd_buf_index - start;
        rs->cmd_buf_index = start;
    }
}

static void readline_bol(ReadLineState *rs)
{
    rs->cmd_buf_index = 0;
}

static void readline_eol(ReadLineState *rs)
{
    rs->cmd_buf_index = rs->cmd_buf_size;
}

static void readline_up_char(ReadLineState *rs)
{
    int idx;

    if (rs->hist_entry == 0)
	return;
    if (rs->hist_entry == -1) {
	/* Find latest entry */
	for (idx = 0; idx < READLINE_MAX_CMDS; idx++) {
	    if (rs->history[idx] == NULL)
		break;
	}
	rs->hist_entry = idx;
    }
    rs->hist_entry--;
    if (rs->hist_entry >= 0) {
	pstrcpy(rs->cmd_buf, sizeof(rs->cmd_buf),
                rs->history[rs->hist_entry]);
	rs->cmd_buf_index = rs->cmd_buf_size = strlen(rs->cmd_buf);
    }
}

static void readline_down_char(ReadLineState *rs)
{
    if (rs->hist_entry == READLINE_MAX_CMDS - 1 || rs->hist_entry == -1)
	return;
    if (rs->history[++rs->hist_entry] != NULL) {
	pstrcpy(rs->cmd_buf, sizeof(rs->cmd_buf),
                rs->history[rs->hist_entry]);
    } else {
	rs->hist_entry = -1;
    }
    rs->cmd_buf_index = rs->cmd_buf_size = strlen(rs->cmd_buf);
}

static void readline_hist_add(ReadLineState *rs, const char *cmdline)
{
    char *hist_entry, *new_entry;
    int idx;

    if (cmdline[0] == '\0')
	return;
    new_entry = NULL;
    if (rs->hist_entry != -1) {
	/* We were editing an existing history entry: replace it */
	hist_entry = rs->history[rs->hist_entry];
	idx = rs->hist_entry;
	if (strcmp(hist_entry, cmdline) == 0) {
	    goto same_entry;
	}
    }
    /* Search cmdline in history buffers */
    for (idx = 0; idx < READLINE_MAX_CMDS; idx++) {
	hist_entry = rs->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(&rs->history[idx], &rs->history[idx + 1],
		    (READLINE_MAX_CMDS - idx + 1) * sizeof(char *));
	    rs->history[READLINE_MAX_CMDS - 1] = NULL;
	    for (; idx < READLINE_MAX_CMDS; idx++) {
		if (rs->history[idx] == NULL)
		    break;
	    }
	    break;
	}
    }
    if (idx == READLINE_MAX_CMDS) {
	/* Need to get one free slot */
	free(rs->history[0]);
	memcpy(rs->history, &rs->history[1],
	       (READLINE_MAX_CMDS - 1) * sizeof(char *));
	rs->history[READLINE_MAX_CMDS - 1] = NULL;
	idx = READLINE_MAX_CMDS - 1;
    }
    if (new_entry == NULL)
	new_entry = strdup(cmdline);
    rs->history[idx] = new_entry;
    rs->hist_entry = -1;
}

/* completion support */

void readline_add_completion(ReadLineState *rs, const char *str)
{
    if (rs->nb_completions < READLINE_MAX_COMPLETIONS) {
        rs->completions[rs->nb_completions++] = qemu_strdup(str);
    }
}

void readline_set_completion_index(ReadLineState *rs, int index)
{
    rs->completion_index = index;
}

static void readline_completion(ReadLineState *rs)
{
    Monitor *mon = cur_mon;
    int len, i, j, max_width, nb_cols, max_prefix;
    char *cmdline;

    rs->nb_completions = 0;

    cmdline = qemu_malloc(rs->cmd_buf_index + 1);
    memcpy(cmdline, rs->cmd_buf, rs->cmd_buf_index);
    cmdline[rs->cmd_buf_index] = '\0';
    rs->completion_finder(cmdline);
    qemu_free(cmdline);

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

/* return true if command handled */
void readline_handle_byte(ReadLineState *rs, int ch)
{
    switch(rs->esc_state) {
    case IS_NORM:
        switch(ch) {
        case 1:
            readline_bol(rs);
            break;
        case 4:
            readline_delete_char(rs);
            break;
        case 5:
            readline_eol(rs);
            break;
        case 9:
            readline_completion(rs);
            break;
        case 10:
        case 13:
            rs->cmd_buf[rs->cmd_buf_size] = '\0';
            if (!rs->read_password)
                readline_hist_add(rs, rs->cmd_buf);
            monitor_printf(rs->mon, "\n");
            rs->cmd_buf_index = 0;
            rs->cmd_buf_size = 0;
            rs->last_cmd_buf_index = 0;
            rs->last_cmd_buf_size = 0;
            rs->readline_func(rs->mon, rs->cmd_buf, rs->readline_opaque);
            break;
        case 23:
            /* ^W */
            readline_backword(rs);
            break;
        case 27:
            rs->esc_state = IS_ESC;
            break;
        case 127:
        case 8:
            readline_backspace(rs);
            break;
	case 155:
            rs->esc_state = IS_CSI;
	    break;
        default:
            if (ch >= 32) {
                readline_insert_char(rs, ch);
            }
            break;
        }
        break;
    case IS_ESC:
        if (ch == '[') {
            rs->esc_state = IS_CSI;
            rs->esc_param = 0;
        } else {
            rs->esc_state = IS_NORM;
        }
        break;
    case IS_CSI:
        switch(ch) {
	case 'A':
	case 'F':
	    readline_up_char(rs);
	    break;
	case 'B':
	case 'E':
	    readline_down_char(rs);
	    break;
        case 'D':
            readline_backward_char(rs);
            break;
        case 'C':
            readline_forward_char(rs);
            break;
        case '0' ... '9':
            rs->esc_param = rs->esc_param * 10 + (ch - '0');
            goto the_end;
        case '~':
            switch(rs->esc_param) {
            case 1:
                readline_bol(rs);
                break;
            case 3:
                readline_delete_char(rs);
                break;
            case 4:
                readline_eol(rs);
                break;
            }
            break;
        default:
            break;
        }
        rs->esc_state = IS_NORM;
    the_end:
        break;
    }
    readline_update(rs);
}

void readline_start(ReadLineState *rs, const char *prompt, int read_password,
                    ReadLineFunc *readline_func, void *opaque)
{
    pstrcpy(rs->prompt, sizeof(rs->prompt), prompt);
    rs->readline_func = readline_func;
    rs->readline_opaque = opaque;
    rs->read_password = read_password;
    rs->cmd_buf_index = 0;
    rs->cmd_buf_size = 0;
}

const char *readline_get_history(ReadLineState *rs, unsigned int index)
{
    if (index >= READLINE_MAX_CMDS)
        return NULL;
    return rs->history[index];
}

ReadLineState *readline_init(Monitor *mon,
                             ReadLineCompletionFunc *completion_finder)
{
    ReadLineState *rs = qemu_mallocz(sizeof(*rs));

    if (!rs)
        return NULL;

    rs->hist_entry = -1;
    rs->mon = mon;
    rs->completion_finder = completion_finder;

    return rs;
}
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	*/
376253ec AL	24	#include "readline.h"
376253ec AL	25	#include "monitor.h"
7e2515e8	26
7e2515e8 FB	27	#define IS_NORM 0
	28	#define IS_ESC 1
	29	#define IS_CSI 2
	30
	31	#define printf do_not_use_printf
	32
4c36ba32	33	void readline_show_prompt(ReadLineState *rs)
7e2515e8	34	{
4c36ba32 AL	35	monitor_printf(rs->mon, "%s", rs->prompt);
	36	monitor_flush(rs->mon);
	37	rs->last_cmd_buf_index = 0;
	38	rs->last_cmd_buf_size = 0;
	39	rs->esc_state = IS_NORM;
7e2515e8 FB	40	}
7e2515e8 FB	41
7e2515e8	42	/* update the displayed command line */
4c36ba32	43	static void readline_update(ReadLineState *rs)
7e2515e8 FB	44	{
	45	int i, delta, len;
	46
4c36ba32 AL	47	if (rs->cmd_buf_size != rs->last_cmd_buf_size \|\|
	48	memcmp(rs->cmd_buf, rs->last_cmd_buf, rs->cmd_buf_size) != 0) {
	49	for(i = 0; i < rs->last_cmd_buf_index; i++) {
	50	monitor_printf(rs->mon, "\033[D");
7e2515e8	51	}
4c36ba32 AL	52	rs->cmd_buf[rs->cmd_buf_size] = '\0';
	53	if (rs->read_password) {
	54	len = strlen(rs->cmd_buf);
7e2515e8	55	for(i = 0; i < len; i++)
4c36ba32	56	monitor_printf(rs->mon, "*");
7e2515e8	57	} else {
4c36ba32	58	monitor_printf(rs->mon, "%s", rs->cmd_buf);
7e2515e8	59	}
4c36ba32 AL	60	monitor_printf(rs->mon, "\033[K");
	61	memcpy(rs->last_cmd_buf, rs->cmd_buf, rs->cmd_buf_size);
	62	rs->last_cmd_buf_size = rs->cmd_buf_size;
	63	rs->last_cmd_buf_index = rs->cmd_buf_size;
7e2515e8	64	}
4c36ba32 AL	65	if (rs->cmd_buf_index != rs->last_cmd_buf_index) {
4c36ba32 AL	66	delta = rs->cmd_buf_index - rs->last_cmd_buf_index;
7e2515e8 FB	67	if (delta > 0) {
7e2515e8 FB	68	for(i = 0;i < delta; i++) {
4c36ba32	69	monitor_printf(rs->mon, "\033[C");
7e2515e8 FB	70	}
	71	} else {
	72	delta = -delta;
	73	for(i = 0;i < delta; i++) {
4c36ba32	74	monitor_printf(rs->mon, "\033[D");
7e2515e8 FB	75	}
7e2515e8 FB	76	}
4c36ba32	77	rs->last_cmd_buf_index = rs->cmd_buf_index;
7e2515e8	78	}
4c36ba32	79	monitor_flush(rs->mon);
7e2515e8 FB	80	}
7e2515e8 FB	81
4c36ba32	82	static void readline_insert_char(ReadLineState *rs, int ch)
7e2515e8	83	{
4c36ba32 AL	84	if (rs->cmd_buf_index < READLINE_CMD_BUF_SIZE) {
	85	memmove(rs->cmd_buf + rs->cmd_buf_index + 1,
	86	rs->cmd_buf + rs->cmd_buf_index,
	87	rs->cmd_buf_size - rs->cmd_buf_index);
	88	rs->cmd_buf[rs->cmd_buf_index] = ch;
	89	rs->cmd_buf_size++;
	90	rs->cmd_buf_index++;
7e2515e8 FB	91	}
	92	}
	93
4c36ba32	94	static void readline_backward_char(ReadLineState *rs)
7e2515e8	95	{
4c36ba32 AL	96	if (rs->cmd_buf_index > 0) {
4c36ba32 AL	97	rs->cmd_buf_index--;
7e2515e8 FB	98	}
	99	}
	100
4c36ba32	101	static void readline_forward_char(ReadLineState *rs)
7e2515e8	102	{
4c36ba32 AL	103	if (rs->cmd_buf_index < rs->cmd_buf_size) {
4c36ba32 AL	104	rs->cmd_buf_index++;
7e2515e8 FB	105	}
	106	}
	107
4c36ba32	108	static void readline_delete_char(ReadLineState *rs)
7e2515e8	109	{
4c36ba32 AL	110	if (rs->cmd_buf_index < rs->cmd_buf_size) {
	111	memmove(rs->cmd_buf + rs->cmd_buf_index,
	112	rs->cmd_buf + rs->cmd_buf_index + 1,
	113	rs->cmd_buf_size - rs->cmd_buf_index - 1);
	114	rs->cmd_buf_size--;
7e2515e8 FB	115	}
	116	}
	117
4c36ba32	118	static void readline_backspace(ReadLineState *rs)
7e2515e8	119	{
4c36ba32 AL	120	if (rs->cmd_buf_index > 0) {
	121	readline_backward_char(rs);
	122	readline_delete_char(rs);
7e2515e8 FB	123	}
	124	}
	125
4c36ba32	126	static void readline_backword(ReadLineState *rs)
33fa11d4 TS	127	{
	128	int start;
	129
4c36ba32	130	if (rs->cmd_buf_index == 0 \|\| rs->cmd_buf_index > rs->cmd_buf_size) {
33fa11d4 TS	131	return;
	132	}
	133
4c36ba32	134	start = rs->cmd_buf_index - 1;
33fa11d4 TS	135
	136	/* find first word (backwards) */
	137	while (start > 0) {
4c36ba32	138	if (!qemu_isspace(rs->cmd_buf[start])) {
33fa11d4 TS	139	break;
	140	}
	141
	142	--start;
	143	}
	144
	145	/* find first space (backwards) */
	146	while (start > 0) {
4c36ba32	147	if (qemu_isspace(rs->cmd_buf[start])) {
33fa11d4 TS	148	++start;
	149	break;
	150	}
	151
	152	--start;
	153	}
	154
	155	/* remove word */
4c36ba32 AL	156	if (start < rs->cmd_buf_index) {
	157	memmove(rs->cmd_buf + start,
	158	rs->cmd_buf + rs->cmd_buf_index,
	159	rs->cmd_buf_size - rs->cmd_buf_index);
	160	rs->cmd_buf_size -= rs->cmd_buf_index - start;
	161	rs->cmd_buf_index = start;
33fa11d4 TS	162	}
	163	}
	164
4c36ba32	165	static void readline_bol(ReadLineState *rs)
7e2515e8	166	{
4c36ba32	167	rs->cmd_buf_index = 0;
7e2515e8 FB	168	}
7e2515e8 FB	169
4c36ba32	170	static void readline_eol(ReadLineState *rs)
7e2515e8	171	{
4c36ba32	172	rs->cmd_buf_index = rs->cmd_buf_size;
7e2515e8 FB	173	}
7e2515e8 FB	174
4c36ba32	175	static void readline_up_char(ReadLineState *rs)
7e2515e8 FB	176	{
	177	int idx;
	178
4c36ba32	179	if (rs->hist_entry == 0)
7e2515e8	180	return;
4c36ba32	181	if (rs->hist_entry == -1) {
7e2515e8	182	/* Find latest entry */
4c36ba32 AL	183	for (idx = 0; idx < READLINE_MAX_CMDS; idx++) {
4c36ba32 AL	184	if (rs->history[idx] == NULL)
7e2515e8 FB	185	break;
7e2515e8 FB	186	}
4c36ba32	187	rs->hist_entry = idx;
7e2515e8	188	}
4c36ba32 AL	189	rs->hist_entry--;
	190	if (rs->hist_entry >= 0) {
	191	pstrcpy(rs->cmd_buf, sizeof(rs->cmd_buf),
	192	rs->history[rs->hist_entry]);
	193	rs->cmd_buf_index = rs->cmd_buf_size = strlen(rs->cmd_buf);
7e2515e8 FB	194	}
	195	}
	196
4c36ba32	197	static void readline_down_char(ReadLineState *rs)
7e2515e8	198	{
4c36ba32	199	if (rs->hist_entry == READLINE_MAX_CMDS - 1 \|\| rs->hist_entry == -1)
7e2515e8	200	return;
4c36ba32 AL	201	if (rs->history[++rs->hist_entry] != NULL) {
	202	pstrcpy(rs->cmd_buf, sizeof(rs->cmd_buf),
	203	rs->history[rs->hist_entry]);
7e2515e8	204	} else {
4c36ba32	205	rs->hist_entry = -1;
7e2515e8	206	}
4c36ba32	207	rs->cmd_buf_index = rs->cmd_buf_size = strlen(rs->cmd_buf);
7e2515e8 FB	208	}
7e2515e8 FB	209
4c36ba32	210	static void readline_hist_add(ReadLineState rs, const char cmdline)
7e2515e8 FB	211	{
	212	char hist_entry, new_entry;
	213	int idx;
	214
	215	if (cmdline[0] == '\0')
	216	return;
	217	new_entry = NULL;
4c36ba32	218	if (rs->hist_entry != -1) {
7e2515e8	219	/* We were editing an existing history entry: replace it */
4c36ba32 AL	220	hist_entry = rs->history[rs->hist_entry];
4c36ba32 AL	221	idx = rs->hist_entry;
7e2515e8 FB	222	if (strcmp(hist_entry, cmdline) == 0) {
	223	goto same_entry;
	224	}
	225	}
	226	/* Search cmdline in history buffers */
4c36ba32 AL	227	for (idx = 0; idx < READLINE_MAX_CMDS; idx++) {
4c36ba32 AL	228	hist_entry = rs->history[idx];
7e2515e8 FB	229	if (hist_entry == NULL)
	230	break;
	231	if (strcmp(hist_entry, cmdline) == 0) {
	232	same_entry:
	233	new_entry = hist_entry;
	234	/* Put this entry at the end of history */
4c36ba32 AL	235	memmove(&rs->history[idx], &rs->history[idx + 1],
	236	(READLINE_MAX_CMDS - idx + 1) * sizeof(char *));
	237	rs->history[READLINE_MAX_CMDS - 1] = NULL;
	238	for (; idx < READLINE_MAX_CMDS; idx++) {
	239	if (rs->history[idx] == NULL)
7e2515e8 FB	240	break;
	241	}
	242	break;
	243	}
	244	}
4c36ba32	245	if (idx == READLINE_MAX_CMDS) {
7e2515e8	246	/* Need to get one free slot */
4c36ba32 AL	247	free(rs->history[0]);
	248	memcpy(rs->history, &rs->history[1],
	249	(READLINE_MAX_CMDS - 1) * sizeof(char *));
	250	rs->history[READLINE_MAX_CMDS - 1] = NULL;
	251	idx = READLINE_MAX_CMDS - 1;
7e2515e8 FB	252	}
	253	if (new_entry == NULL)
	254	new_entry = strdup(cmdline);
4c36ba32 AL	255	rs->history[idx] = new_entry;
4c36ba32 AL	256	rs->hist_entry = -1;
7e2515e8 FB	257	}
	258
	259	/* completion support */
	260
4c36ba32	261	void readline_add_completion(ReadLineState rs, const char str)
7e2515e8	262	{
4c36ba32 AL	263	if (rs->nb_completions < READLINE_MAX_COMPLETIONS) {
4c36ba32 AL	264	rs->completions[rs->nb_completions++] = qemu_strdup(str);
7e2515e8 FB	265	}
	266	}
	267
4c36ba32	268	void readline_set_completion_index(ReadLineState *rs, int index)
376253ec	269	{
4c36ba32	270	rs->completion_index = index;
376253ec AL	271	}
376253ec AL	272
4c36ba32	273	static void readline_completion(ReadLineState *rs)
7e2515e8	274	{
376253ec	275	Monitor *mon = cur_mon;
b427c726	276	int len, i, j, max_width, nb_cols, max_prefix;
7e2515e8 FB	277	char *cmdline;
7e2515e8 FB	278
4c36ba32	279	rs->nb_completions = 0;
3b46e624	280
4c36ba32 AL	281	cmdline = qemu_malloc(rs->cmd_buf_index + 1);
	282	memcpy(cmdline, rs->cmd_buf, rs->cmd_buf_index);
	283	cmdline[rs->cmd_buf_index] = '\0';
	284	rs->completion_finder(cmdline);
7e2515e8 FB	285	qemu_free(cmdline);
	286
	287	/* no completion found */
4c36ba32	288	if (rs->nb_completions <= 0)
7e2515e8	289	return;
4c36ba32 AL	290	if (rs->nb_completions == 1) {
	291	len = strlen(rs->completions[0]);
	292	for(i = rs->completion_index; i < len; i++) {
	293	readline_insert_char(rs, rs->completions[0][i]);
7e2515e8 FB	294	}
7e2515e8 FB	295	/* extra space for next argument. XXX: make it more generic */
4c36ba32 AL	296	if (len > 0 && rs->completions[0][len - 1] != '/')
4c36ba32 AL	297	readline_insert_char(rs, ' ');
7e2515e8	298	} else {
376253ec	299	monitor_printf(mon, "\n");
7e2515e8	300	max_width = 0;
b427c726	301	max_prefix = 0;
4c36ba32 AL	302	for(i = 0; i < rs->nb_completions; i++) {
4c36ba32 AL	303	len = strlen(rs->completions[i]);
b427c726 TS	304	if (i==0) {
	305	max_prefix = len;
	306	} else {
	307	if (len < max_prefix)
	308	max_prefix = len;
	309	for(j=0; j<max_prefix; j++) {
4c36ba32	310	if (rs->completions[i][j] != rs->completions[0][j])
b427c726 TS	311	max_prefix = j;
	312	}
	313	}
7e2515e8 FB	314	if (len > max_width)
	315	max_width = len;
	316	}
b427c726	317	if (max_prefix > 0)
4c36ba32 AL	318	for(i = rs->completion_index; i < max_prefix; i++) {
4c36ba32 AL	319	readline_insert_char(rs, rs->completions[0][i]);
b427c726	320	}
7e2515e8 FB	321	max_width += 2;
	322	if (max_width < 10)
	323	max_width = 10;
	324	else if (max_width > 80)
	325	max_width = 80;
	326	nb_cols = 80 / max_width;
	327	j = 0;
4c36ba32 AL	328	for(i = 0; i < rs->nb_completions; i++) {
	329	monitor_printf(rs->mon, "%-*s", max_width, rs->completions[i]);
	330	if (++j == nb_cols \|\| i == (rs->nb_completions - 1)) {
	331	monitor_printf(rs->mon, "\n");
7e2515e8 FB	332	j = 0;
	333	}
	334	}
4c36ba32	335	readline_show_prompt(rs);
7e2515e8 FB	336	}
	337	}
	338
	339	/* return true if command handled */
4c36ba32	340	void readline_handle_byte(ReadLineState *rs, int ch)
7e2515e8	341	{
4c36ba32	342	switch(rs->esc_state) {
7e2515e8 FB	343	case IS_NORM:
	344	switch(ch) {
	345	case 1:
4c36ba32	346	readline_bol(rs);
7e2515e8 FB	347	break;
7e2515e8 FB	348	case 4:
4c36ba32	349	readline_delete_char(rs);
7e2515e8 FB	350	break;
7e2515e8 FB	351	case 5:
4c36ba32	352	readline_eol(rs);
7e2515e8 FB	353	break;
7e2515e8 FB	354	case 9:
4c36ba32	355	readline_completion(rs);
7e2515e8 FB	356	break;
	357	case 10:
	358	case 13:
4c36ba32 AL	359	rs->cmd_buf[rs->cmd_buf_size] = '\0';
	360	if (!rs->read_password)
	361	readline_hist_add(rs, rs->cmd_buf);
	362	monitor_printf(rs->mon, "\n");
	363	rs->cmd_buf_index = 0;
	364	rs->cmd_buf_size = 0;
	365	rs->last_cmd_buf_index = 0;
	366	rs->last_cmd_buf_size = 0;
	367	rs->readline_func(rs->mon, rs->cmd_buf, rs->readline_opaque);
7e2515e8	368	break;
33fa11d4 TS	369	case 23:
33fa11d4 TS	370	/* ^W */
4c36ba32	371	readline_backword(rs);
33fa11d4	372	break;
7e2515e8	373	case 27:
4c36ba32	374	rs->esc_state = IS_ESC;
7e2515e8 FB	375	break;
	376	case 127:
	377	case 8:
4c36ba32	378	readline_backspace(rs);
7e2515e8 FB	379	break;
7e2515e8 FB	380	case 155:
4c36ba32	381	rs->esc_state = IS_CSI;
7e2515e8 FB	382	break;
	383	default:
	384	if (ch >= 32) {
4c36ba32	385	readline_insert_char(rs, ch);
7e2515e8 FB	386	}
	387	break;
	388	}
	389	break;
	390	case IS_ESC:
	391	if (ch == '[') {
4c36ba32 AL	392	rs->esc_state = IS_CSI;
4c36ba32 AL	393	rs->esc_param = 0;
7e2515e8	394	} else {
4c36ba32	395	rs->esc_state = IS_NORM;
7e2515e8 FB	396	}
	397	break;
	398	case IS_CSI:
	399	switch(ch) {
	400	case 'A':
	401	case 'F':
4c36ba32	402	readline_up_char(rs);
7e2515e8 FB	403	break;
	404	case 'B':
	405	case 'E':
4c36ba32	406	readline_down_char(rs);
7e2515e8 FB	407	break;
7e2515e8 FB	408	case 'D':
4c36ba32	409	readline_backward_char(rs);
7e2515e8 FB	410	break;
7e2515e8 FB	411	case 'C':
4c36ba32	412	readline_forward_char(rs);
7e2515e8 FB	413	break;
7e2515e8 FB	414	case '0' ... '9':
4c36ba32	415	rs->esc_param = rs->esc_param * 10 + (ch - '0');
7e2515e8 FB	416	goto the_end;
7e2515e8 FB	417	case '~':
4c36ba32	418	switch(rs->esc_param) {
7e2515e8	419	case 1:
4c36ba32	420	readline_bol(rs);
7e2515e8 FB	421	break;
7e2515e8 FB	422	case 3:
4c36ba32	423	readline_delete_char(rs);
7e2515e8 FB	424	break;
7e2515e8 FB	425	case 4:
4c36ba32	426	readline_eol(rs);
7e2515e8 FB	427	break;
	428	}
	429	break;
	430	default:
	431	break;
	432	}
4c36ba32	433	rs->esc_state = IS_NORM;
7e2515e8 FB	434	the_end:
	435	break;
	436	}
4c36ba32	437	readline_update(rs);
7e2515e8 FB	438	}
7e2515e8 FB	439
4c36ba32	440	void readline_start(ReadLineState rs, const char prompt, int read_password,
7e2515e8 FB	441	ReadLineFunc readline_func, void opaque)
7e2515e8 FB	442	{
4c36ba32 AL	443	pstrcpy(rs->prompt, sizeof(rs->prompt), prompt);
	444	rs->readline_func = readline_func;
	445	rs->readline_opaque = opaque;
	446	rs->read_password = read_password;
	447	rs->cmd_buf_index = 0;
	448	rs->cmd_buf_size = 0;
7e2515e8 FB	449	}
7e2515e8 FB	450
4c36ba32	451	const char readline_get_history(ReadLineState rs, unsigned int index)
7e2515e8	452	{
4c36ba32	453	if (index >= READLINE_MAX_CMDS)
7e2515e8	454	return NULL;
4c36ba32 AL	455	return rs->history[index];
	456	}
	457
	458	ReadLineState readline_init(Monitor mon,
	459	ReadLineCompletionFunc *completion_finder)
	460	{
	461	ReadLineState rs = qemu_mallocz(sizeof(rs));
	462
	463	if (!rs)
	464	return NULL;
	465
	466	rs->hist_entry = -1;
	467	rs->mon = mon;
	468	rs->completion_finder = completion_finder;
	469
	470	return rs;
7e2515e8	471	}