readline.c - qemu - Git at Google

 /*
  * 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");
             /* 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];
 }
	/*
	* 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");
	/* 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];
	}