busybox/shell/cmdedit.c

/* vi: set sw=4 ts=4: */
/*
 * Termios command line History and Editing.
 *
 * Copyright (c) 1986-2003 may safely be consumed by a BSD or GPL license.
 * Written by:   Vladimir Oleynik <dzo@simtreas.ru>
 *
 * Used ideas:
 *      Adam Rogoyski    <rogoyski@cs.utexas.edu>
 *      Dave Cinege      <dcinege@psychosis.com>
 *      Jakub Jelinek (c) 1995
 *      Erik Andersen    <andersen@codepoet.org> (Majorly adjusted for busybox)
 *
 * This code is 'as is' with no warranty.
 *
 *
 */

/*
   Usage and Known bugs:
   Terminal key codes are not extensive, and more will probably
   need to be added. This version was created on Debian GNU/Linux 2.x.
   Delete, Backspace, Home, End, and the arrow keys were tested
   to work in an Xterm and console. Ctrl-A also works as Home.
   Ctrl-E also works as End.

   Small bugs (simple effect):
   - not true viewing if terminal size (x*y symbols) less
     size (prompt + editor`s line + 2 symbols)
   - not true viewing if length prompt less terminal width
 */


#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <ctype.h>
#include <signal.h>
#include <limits.h>

#include "busybox.h"

#include "../shell/cmdedit.h"


#ifdef CONFIG_LOCALE_SUPPORT
#define Isprint(c) isprint((c))
#else
#define Isprint(c) ( (c) >= ' ' && (c) != ((unsigned char)'\233') )
#endif

#ifdef TEST

/* pretect redefined for test */
#undef CONFIG_FEATURE_COMMAND_EDITING
#undef CONFIG_FEATURE_COMMAND_TAB_COMPLETION
#undef CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION
#undef CONFIG_FEATURE_NONPRINTABLE_INVERSE_PUT
#undef CONFIG_FEATURE_CLEAN_UP

#define CONFIG_FEATURE_COMMAND_EDITING
#define CONFIG_FEATURE_COMMAND_TAB_COMPLETION
#define CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION
#define CONFIG_FEATURE_NONPRINTABLE_INVERSE_PUT
#define CONFIG_FEATURE_CLEAN_UP

#endif                                                  /* TEST */

#ifdef CONFIG_FEATURE_COMMAND_TAB_COMPLETION
#include <dirent.h>
#include <sys/stat.h>
#endif

#ifdef CONFIG_FEATURE_COMMAND_EDITING

#if defined(CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION) || defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
#define CONFIG_FEATURE_GETUSERNAME_AND_HOMEDIR
#endif

#ifdef CONFIG_FEATURE_GETUSERNAME_AND_HOMEDIR
#include "pwd_.h"
#endif                                                  /* advanced FEATURES */


/* Maximum length of the linked list for the command line history */
#ifndef CONFIG_FEATURE_COMMAND_HISTORY
#define MAX_HISTORY   15
#else
#define MAX_HISTORY   CONFIG_FEATURE_COMMAND_HISTORY
#endif

#if MAX_HISTORY < 1
#warning cmdedit: You set MAX_HISTORY < 1. The history algorithm switched off.
#else
static char *history[MAX_HISTORY+1]; /* history + current */
/* saved history lines */
static int n_history;
/* current pointer to history line */
static int cur_history;
#endif

#include <termios.h>
#define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
#define getTermSettings(fd,argp) tcgetattr(fd, argp);

/* Current termio and the previous termio before starting sh */
static struct termios initial_settings, new_settings;


static
volatile int cmdedit_termw = 80;        /* actual terminal width */
static
volatile int handlers_sets = 0; /* Set next bites: */

enum {
	SET_ATEXIT = 1,         /* when atexit() has been called
				   and get euid,uid,gid to fast compare */
	SET_WCHG_HANDLERS = 2,  /* winchg signal handler */
	SET_RESET_TERM = 4,     /* if the terminal needs to be reset upon exit */
};


static int cmdedit_x;           /* real x terminal position */
static int cmdedit_y;           /* pseudoreal y terminal position */
static int cmdedit_prmt_len;    /* lenght prompt without colores string */

static int cursor;              /* required global for signal handler */
static int len;                 /* --- "" - - "" - -"- --""-- --""--- */
static char *command_ps;        /* --- "" - - "" - -"- --""-- --""--- */
static
#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
	const
#endif
char *cmdedit_prompt;           /* --- "" - - "" - -"- --""-- --""--- */

#ifdef CONFIG_FEATURE_GETUSERNAME_AND_HOMEDIR
static char *user_buf = "";
static char *home_pwd_buf = "";
static int my_euid;
#endif

#ifdef CONFIG_FEATURE_SH_FANCY_PROMPT
static char *hostname_buf;
static int num_ok_lines = 1;
#endif


#ifdef  CONFIG_FEATURE_COMMAND_TAB_COMPLETION

#ifndef CONFIG_FEATURE_GETUSERNAME_AND_HOMEDIR
static int my_euid;
#endif

static int my_uid;
static int my_gid;

#endif  /* CONFIG_FEATURE_COMMAND_TAB_COMPLETION */

static void cmdedit_setwidth(int w, int redraw_flg);

static void win_changed(int nsig)
{
	static sighandler_t previous_SIGWINCH_handler;  /* for reset */

	/*   emulate      || signal call */
	if (nsig == -SIGWINCH || nsig == SIGWINCH) {
		int width = 0;
		get_terminal_width_height(0, &width, NULL);
		cmdedit_setwidth(width, nsig == SIGWINCH);
	}
	/* Unix not all standart in recall signal */

	if (nsig == -SIGWINCH)          /* save previous handler   */
		previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
	else if (nsig == SIGWINCH)      /* signaled called handler */
		signal(SIGWINCH, win_changed);  /* set for next call       */
	else                                            /* nsig == 0 */
		/* set previous handler    */
		signal(SIGWINCH, previous_SIGWINCH_handler);    /* reset    */
}

static void cmdedit_reset_term(void)
{
	if ((handlers_sets & SET_RESET_TERM) != 0) {
/* sparc and other have broken termios support: use old termio handling. */
		setTermSettings(STDIN_FILENO, (void *) &initial_settings);
		handlers_sets &= ~SET_RESET_TERM;
	}
	if ((handlers_sets & SET_WCHG_HANDLERS) != 0) {
		/* reset SIGWINCH handler to previous (default) */
		win_changed(0);
		handlers_sets &= ~SET_WCHG_HANDLERS;
	}
	fflush(stdout);
}


/* special for recount position for scroll and remove terminal margin effect */
static void cmdedit_set_out_char(int next_char)
{

	int c = (int)((unsigned char) command_ps[cursor]);

	if (c == 0)
		c = ' ';        /* destroy end char? */
#ifdef CONFIG_FEATURE_NONPRINTABLE_INVERSE_PUT
	if (!Isprint(c)) {      /* Inverse put non-printable characters */
		if (c >= 128)
			c -= 128;
		if (c < ' ')
			c += '@';
		if (c == 127)
			c = '?';
		printf("\033[7m%c\033[0m", c);
	} else
#endif
		putchar(c);
	if (++cmdedit_x >= cmdedit_termw) {
		/* terminal is scrolled down */
		cmdedit_y++;
		cmdedit_x = 0;

		if (!next_char)
			next_char = ' ';
		/* destroy "(auto)margin" */
		putchar(next_char);
		putchar('\b');
	}
	cursor++;
}

/* Move to end line. Bonus: rewrite line from cursor */
static void input_end(void)
{
	while (cursor < len)
		cmdedit_set_out_char(0);
}

/* Go to the next line */
static void goto_new_line(void)
{
	input_end();
	if (cmdedit_x)
		putchar('\n');
}


static inline void out1str(const char *s)
{
	if ( s )
		fputs(s, stdout);
}

static inline void beep(void)
{
	putchar('\007');
}

/* Move back one character */
/* special for slow terminal */
static void input_backward(int num)
{
	if (num > cursor)
		num = cursor;
	cursor -= num;          /* new cursor (in command, not terminal) */

	if (cmdedit_x >= num) {         /* no to up line */
		cmdedit_x -= num;
		if (num < 4)
			while (num-- > 0)
				putchar('\b');

		else
			printf("\033[%dD", num);
	} else {
		int count_y;

		if (cmdedit_x) {
			putchar('\r');          /* back to first terminal pos.  */
			num -= cmdedit_x;       /* set previous backward        */
		}
		count_y = 1 + num / cmdedit_termw;
		printf("\033[%dA", count_y);
		cmdedit_y -= count_y;
		/*  require  forward  after  uping   */
		cmdedit_x = cmdedit_termw * count_y - num;
		printf("\033[%dC", cmdedit_x);  /* set term cursor   */
	}
}

static void put_prompt(void)
{
	out1str(cmdedit_prompt);
	cmdedit_x = cmdedit_prmt_len;   /* count real x terminal position */
	cursor = 0;
	cmdedit_y = 0;                  /* new quasireal y */
}

#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
static void parse_prompt(const char *prmt_ptr)
{
	cmdedit_prompt = prmt_ptr;
	cmdedit_prmt_len = strlen(prmt_ptr);
	put_prompt();
}
#else
static void parse_prompt(const char *prmt_ptr)
{
	int prmt_len = 0;
	int sub_len = 0;
	char  flg_not_length = '[';
	char *prmt_mem_ptr = xcalloc(1, 1);
	char *pwd_buf = xgetcwd(0);
	char  buf2[PATH_MAX + 1];
	char  buf[2];
	char  c;
	char *pbuf;

	if (!pwd_buf) {
		pwd_buf=(char *)bb_msg_unknown;
	}

	while (*prmt_ptr) {
		pbuf    = buf;
		pbuf[1] = 0;
		c = *prmt_ptr++;
		if (c == '\\') {
			const char *cp = prmt_ptr;
			int l;

			c = bb_process_escape_sequence(&prmt_ptr);
			if(prmt_ptr==cp) {
			  if (*cp == 0)
				break;
			  c = *prmt_ptr++;
			  switch (c) {
#ifdef CONFIG_FEATURE_GETUSERNAME_AND_HOMEDIR
			  case 'u':
				pbuf = user_buf;
				break;
#endif
			  case 'h':
				pbuf = hostname_buf;
				if (pbuf == 0) {
					pbuf = xcalloc(256, 1);
					if (gethostname(pbuf, 255) < 0) {
						strcpy(pbuf, "?");
					} else {
						char *s = strchr(pbuf, '.');

						if (s)
							*s = 0;
					}
					hostname_buf = pbuf;
				}
				break;
			  case '$':
				c = my_euid == 0 ? '#' : '$';
				break;
#ifdef CONFIG_FEATURE_GETUSERNAME_AND_HOMEDIR
			  case 'w':
				pbuf = pwd_buf;
				l = strlen(home_pwd_buf);
				if (home_pwd_buf[0] != 0 &&
				    strncmp(home_pwd_buf, pbuf, l) == 0 &&
				    (pbuf[l]=='/' || pbuf[l]=='\0') &&
				    strlen(pwd_buf+l)<PATH_MAX) {
					pbuf = buf2;
					*pbuf = '~';
					strcpy(pbuf+1, pwd_buf+l);
					}
				break;
#endif
			  case 'W':
				pbuf = pwd_buf;
				cp = strrchr(pbuf,'/');
				if ( (cp != NULL) && (cp != pbuf) )
					pbuf += (cp-pbuf)+1;
				break;
			  case '!':
				snprintf(pbuf = buf2, sizeof(buf2), "%d", num_ok_lines);
				break;
			  case 'e': case 'E':     /* \e \E = \033 */
				c = '\033';
				break;
			  case 'x': case 'X':
				for (l = 0; l < 3;) {
					int h;
					buf2[l++] = *prmt_ptr;
					buf2[l] = 0;
					h = strtol(buf2, &pbuf, 16);
					if (h > UCHAR_MAX || (pbuf - buf2) < l) {
						l--;
						break;
					}
					prmt_ptr++;
				}
				buf2[l] = 0;
				c = (char)strtol(buf2, 0, 16);
				if(c==0)
					c = '?';
				pbuf = buf;
				break;
			  case '[': case ']':
				if (c == flg_not_length) {
					flg_not_length = flg_not_length == '[' ? ']' : '[';
					continue;
				}
				break;
			  }
			}
		}
		if(pbuf == buf)
			*pbuf = c;
		prmt_len += strlen(pbuf);
		prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
		if (flg_not_length == ']')
			sub_len++;
	}
	if(pwd_buf!=(char *)bb_msg_unknown)
		free(pwd_buf);
	cmdedit_prompt = prmt_mem_ptr;
	cmdedit_prmt_len = prmt_len - sub_len;
	put_prompt();
}
#endif


/* draw prompt, editor line, and clear tail */
static void redraw(int y, int back_cursor)
{
	if (y > 0)                              /* up to start y */
		printf("\033[%dA", y);
	putchar('\r');
	put_prompt();
	input_end();                            /* rewrite */
	printf("\033[J");                       /* destroy tail after cursor */
	input_backward(back_cursor);
}

/* Delete the char in front of the cursor */
static void input_delete(void)
{
	int j = cursor;

	if (j == len)
		return;

	strcpy(command_ps + j, command_ps + j + 1);
	len--;
	input_end();                    /* rewtite new line */
	cmdedit_set_out_char(0);        /* destroy end char */
	input_backward(cursor - j);     /* back to old pos cursor */
}

/* Delete the char in back of the cursor */
static void input_backspace(void)
{
	if (cursor > 0) {
		input_backward(1);
		input_delete();
	}
}


/* Move forward one character */
static void input_forward(void)
{
	if (cursor < len)
		cmdedit_set_out_char(command_ps[cursor + 1]);
}


static void cmdedit_setwidth(int w, int redraw_flg)
{
	cmdedit_termw = cmdedit_prmt_len + 2;
	if (w <= cmdedit_termw) {
		cmdedit_termw = cmdedit_termw % w;
	}
	if (w > cmdedit_termw) {
		cmdedit_termw = w;

		if (redraw_flg) {
			/* new y for current cursor */
			int new_y = (cursor + cmdedit_prmt_len) / w;

			/* redraw */
			redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), len - cursor);
			fflush(stdout);
		}
	}
}

static void cmdedit_init(void)
{
	cmdedit_prmt_len = 0;
	if ((handlers_sets & SET_WCHG_HANDLERS) == 0) {
		/* emulate usage handler to set handler and call yours work */
		win_changed(-SIGWINCH);
		handlers_sets |= SET_WCHG_HANDLERS;
	}

	if ((handlers_sets & SET_ATEXIT) == 0) {
#ifdef CONFIG_FEATURE_GETUSERNAME_AND_HOMEDIR
		struct passwd *entry;

		my_euid = geteuid();
		entry = getpwuid(my_euid);
		if (entry) {
			user_buf = bb_xstrdup(entry->pw_name);
			home_pwd_buf = bb_xstrdup(entry->pw_dir);
		}
#endif

#ifdef  CONFIG_FEATURE_COMMAND_TAB_COMPLETION

#ifndef CONFIG_FEATURE_GETUSERNAME_AND_HOMEDIR
		my_euid = geteuid();
#endif
		my_uid = getuid();
		my_gid = getgid();
#endif  /* CONFIG_FEATURE_COMMAND_TAB_COMPLETION */
		handlers_sets |= SET_ATEXIT;
		atexit(cmdedit_reset_term);     /* be sure to do this only once */
	}
}

#ifdef CONFIG_FEATURE_COMMAND_TAB_COMPLETION

static int is_execute(const struct stat *st)
{
	if ((!my_euid && (st->st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))) ||
		(my_uid == st->st_uid && (st->st_mode & S_IXUSR)) ||
		(my_gid == st->st_gid && (st->st_mode & S_IXGRP)) ||
		(st->st_mode & S_IXOTH)) return TRUE;
	return FALSE;
}

#ifdef CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION

static char **username_tab_completion(char *ud, int *num_matches)
{
	struct passwd *entry;
	int userlen;
	char *temp;


	ud++;                           /* ~user/... to user/... */
	userlen = strlen(ud);

	if (num_matches == 0) {         /* "~/..." or "~user/..." */
		char *sav_ud = ud - 1;
		char *home = 0;

		if (*ud == '/') {       /* "~/..."     */
			home = home_pwd_buf;
		} else {
			/* "~user/..." */
			temp = strchr(ud, '/');
			*temp = 0;              /* ~user\0 */
			entry = getpwnam(ud);
			*temp = '/';            /* restore ~user/... */
			ud = temp;
			if (entry)
				home = entry->pw_dir;
		}
		if (home) {
			if ((userlen + strlen(home) + 1) < BUFSIZ) {
				char temp2[BUFSIZ];     /* argument size */

				/* /home/user/... */
				sprintf(temp2, "%s%s", home, ud);
				strcpy(sav_ud, temp2);
			}
		}
		return 0;       /* void, result save to argument :-) */
	} else {
		/* "~[^/]*" */
		char **matches = (char **) NULL;
		int nm = 0;

		setpwent();

		while ((entry = getpwent()) != NULL) {
			/* Null usernames should result in all users as possible completions. */
			if ( /*!userlen || */ !strncmp(ud, entry->pw_name, userlen)) {

			       bb_xasprintf(&temp, "~%s/", entry->pw_name);
				matches = xrealloc(matches, (nm + 1) * sizeof(char *));

				matches[nm++] = temp;
			}
		}

		endpwent();
		(*num_matches) = nm;
		return (matches);
	}
}
#endif  /* CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION */

enum {
	FIND_EXE_ONLY = 0,
	FIND_DIR_ONLY = 1,
	FIND_FILE_ONLY = 2,
};

#ifdef CONFIG_ASH
const char *cmdedit_path_lookup;
#else
#define cmdedit_path_lookup getenv("PATH")
#endif

static int path_parse(char ***p, int flags)
{
	int npth;
	const char *tmp;
	const char *pth;

	/* if not setenv PATH variable, to search cur dir "." */
	if (flags != FIND_EXE_ONLY || (pth = cmdedit_path_lookup) == 0 ||
		/* PATH=<empty> or PATH=:<empty> */
		*pth == 0 || (*pth == ':' && *(pth + 1) == 0)) {
		return 1;
	}

	tmp = pth;
	npth = 0;

	for (;;) {
		npth++;                 /* count words is + 1 count ':' */
		tmp = strchr(tmp, ':');
		if (tmp) {
			if (*++tmp == 0)
				break;  /* :<empty> */
		} else
			break;
	}

	*p = xmalloc(npth * sizeof(char *));

	tmp = pth;
	(*p)[0] = bb_xstrdup(tmp);
	npth = 1;                       /* count words is + 1 count ':' */

	for (;;) {
		tmp = strchr(tmp, ':');
		if (tmp) {
			(*p)[0][(tmp - pth)] = 0;       /* ':' -> '\0' */
			if (*++tmp == 0)
				break;                  /* :<empty> */
		} else
			break;
		(*p)[npth++] = &(*p)[0][(tmp - pth)];   /* p[next]=p[0][&'\0'+1] */
	}

	return npth;
}

static char *add_quote_for_spec_chars(char *found)
{
	int l = 0;
	char *s = xmalloc((strlen(found) + 1) * 2);

	while (*found) {
		if (strchr(" `\"#$%^&*()=+{}[]:;\'|\\<>", *found))
			s[l++] = '\\';
		s[l++] = *found++;
	}
	s[l] = 0;
	return s;
}

static char **exe_n_cwd_tab_completion(char *command, int *num_matches,
					int type)
{

	char **matches = 0;
	DIR *dir;
	struct dirent *next;
	char dirbuf[BUFSIZ];
	int nm = *num_matches;
	struct stat st;
	char *path1[1];
	char **paths = path1;
	int npaths;
	int i;
	char *found;
	char *pfind = strrchr(command, '/');

	path1[0] = ".";

	if (pfind == NULL) {
		/* no dir, if flags==EXE_ONLY - get paths, else "." */
		npaths = path_parse(&paths, type);
		pfind = command;
	} else {
		/* with dir */
		/* save for change */
		strcpy(dirbuf, command);
		/* set dir only */
		dirbuf[(pfind - command) + 1] = 0;
#ifdef CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION
		if (dirbuf[0] == '~')   /* ~/... or ~user/... */
			username_tab_completion(dirbuf, 0);
#endif
		/* "strip" dirname in command */
		pfind++;

		paths[0] = dirbuf;
		npaths = 1;                             /* only 1 dir */
	}

	for (i = 0; i < npaths; i++) {

		dir = opendir(paths[i]);
		if (!dir)                       /* Don't print an error */
			continue;

		while ((next = readdir(dir)) != NULL) {
			char *str_found = next->d_name;

			/* matched ? */
			if (strncmp(str_found, pfind, strlen(pfind)))
				continue;
			/* not see .name without .match */
			if (*str_found == '.' && *pfind == 0) {
				if (*paths[i] == '/' && paths[i][1] == 0
					&& str_found[1] == 0) str_found = "";   /* only "/" */
				else
					continue;
			}
			found = concat_path_file(paths[i], str_found);
			/* hmm, remover in progress? */
			if (stat(found, &st) < 0)
				goto cont;
			/* find with dirs ? */
			if (paths[i] != dirbuf)
				strcpy(found, next->d_name);    /* only name */
			if (S_ISDIR(st.st_mode)) {
				/* name is directory      */
				str_found = found;
				found = concat_path_file(found, "");
				free(str_found);
				str_found = add_quote_for_spec_chars(found);
			} else {
				/* not put found file if search only dirs for cd */
				if (type == FIND_DIR_ONLY)
					goto cont;
				str_found = add_quote_for_spec_chars(found);
				if (type == FIND_FILE_ONLY ||
					(type == FIND_EXE_ONLY && is_execute(&st)))
					strcat(str_found, " ");
			}
			/* Add it to the list */
			matches = xrealloc(matches, (nm + 1) * sizeof(char *));

			matches[nm++] = str_found;
cont:
			free(found);
		}
		closedir(dir);
	}
	if (paths != path1) {
		free(paths[0]);                 /* allocated memory only in first member */
		free(paths);
	}
	*num_matches = nm;
	return (matches);
}

static int match_compare(const void *a, const void *b)
{
	return strcmp(*(char **) a, *(char **) b);
}



#define QUOT    (UCHAR_MAX+1)

#define collapse_pos(is, in) { \
	memcpy(int_buf+(is), int_buf+(in), (BUFSIZ+1-(is)-(in))*sizeof(int)); \
	memcpy(pos_buf+(is), pos_buf+(in), (BUFSIZ+1-(is)-(in))*sizeof(int)); }

static int find_match(char *matchBuf, int *len_with_quotes)
{
	int i, j;
	int command_mode;
	int c, c2;
	int int_buf[BUFSIZ + 1];
	int pos_buf[BUFSIZ + 1];

	/* set to integer dimension characters and own positions */
	for (i = 0;; i++) {
		int_buf[i] = (int) ((unsigned char) matchBuf[i]);
		if (int_buf[i] == 0) {
			pos_buf[i] = -1;        /* indicator end line */
			break;
		} else
			pos_buf[i] = i;
	}

	/* mask \+symbol and convert '\t' to ' ' */
	for (i = j = 0; matchBuf[i]; i++, j++)
		if (matchBuf[i] == '\\') {
			collapse_pos(j, j + 1);
			int_buf[j] |= QUOT;
			i++;
#ifdef CONFIG_FEATURE_NONPRINTABLE_INVERSE_PUT
			if (matchBuf[i] == '\t')        /* algorithm equivalent */
				int_buf[j] = ' ' | QUOT;
#endif
		}
#ifdef CONFIG_FEATURE_NONPRINTABLE_INVERSE_PUT
		else if (matchBuf[i] == '\t')
			int_buf[j] = ' ';
#endif

	/* mask "symbols" or 'symbols' */
	c2 = 0;
	for (i = 0; int_buf[i]; i++) {
		c = int_buf[i];
		if (c == '\'' || c == '"') {
			if (c2 == 0)
				c2 = c;
			else {
				if (c == c2)
					c2 = 0;
				else
					int_buf[i] |= QUOT;
			}
		} else if (c2 != 0 && c != '$')
			int_buf[i] |= QUOT;
	}

	/* skip commands with arguments if line have commands delimiters */
	/* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */
	for (i = 0; int_buf[i]; i++) {
		c = int_buf[i];
		c2 = int_buf[i + 1];
		j = i ? int_buf[i - 1] : -1;
		command_mode = 0;
		if (c == ';' || c == '&' || c == '|') {
			command_mode = 1 + (c == c2);
			if (c == '&') {
				if (j == '>' || j == '<')
					command_mode = 0;
			} else if (c == '|' && j == '>')
				command_mode = 0;
		}
		if (command_mode) {
			collapse_pos(0, i + command_mode);
			i = -1;                         /* hack incremet */
		}
	}
	/* collapse `command...` */
	for (i = 0; int_buf[i]; i++)
		if (int_buf[i] == '`') {
			for (j = i + 1; int_buf[j]; j++)
				if (int_buf[j] == '`') {
					collapse_pos(i, j + 1);
					j = 0;
					break;
				}
			if (j) {
				/* not found close ` - command mode, collapse all previous */
				collapse_pos(0, i + 1);
				break;
			} else
				i--;                    /* hack incremet */
		}

	/* collapse (command...(command...)...) or {command...{command...}...} */
	c = 0;                                          /* "recursive" level */
	c2 = 0;
	for (i = 0; int_buf[i]; i++)
		if (int_buf[i] == '(' || int_buf[i] == '{') {
			if (int_buf[i] == '(')
				c++;
			else
				c2++;
			collapse_pos(0, i + 1);
			i = -1;                         /* hack incremet */
		}
	for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++)
		if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) {
			if (int_buf[i] == ')')
				c--;
			else
				c2--;
			collapse_pos(0, i + 1);
			i = -1;                         /* hack incremet */
		}

	/* skip first not quote space */
	for (i = 0; int_buf[i]; i++)
		if (int_buf[i] != ' ')
			break;
	if (i)
		collapse_pos(0, i);

	/* set find mode for completion */
	command_mode = FIND_EXE_ONLY;
	for (i = 0; int_buf[i]; i++)
		if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
			if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY
				&& matchBuf[pos_buf[0]]=='c'
				&& matchBuf[pos_buf[1]]=='d' )
				command_mode = FIND_DIR_ONLY;
			else {
				command_mode = FIND_FILE_ONLY;
				break;
			}
		}
	/* "strlen" */
	for (i = 0; int_buf[i]; i++);
	/* find last word */
	for (--i; i >= 0; i--) {
		c = int_buf[i];
		if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') {
			collapse_pos(0, i + 1);
			break;
		}
	}
	/* skip first not quoted '\'' or '"' */
	for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++);
	/* collapse quote or unquote // or /~ */
	while ((int_buf[i] & ~QUOT) == '/' &&
			((int_buf[i + 1] & ~QUOT) == '/'
			 || (int_buf[i + 1] & ~QUOT) == '~')) {
		i++;
	}

	/* set only match and destroy quotes */
	j = 0;
	for (c = 0; pos_buf[i] >= 0; i++) {
		matchBuf[c++] = matchBuf[pos_buf[i]];
		j = pos_buf[i] + 1;
	}
	matchBuf[c] = 0;
	/* old lenght matchBuf with quotes symbols */
	*len_with_quotes = j ? j - pos_buf[0] : 0;

	return command_mode;
}

/*
   display by column original ideas from ls applet,
   very optimize by my :)
*/
static void showfiles(char **matches, int nfiles)
{
	int ncols, row;
	int column_width = 0;
	int nrows = nfiles;

	/* find the longest file name-  use that as the column width */
	for (row = 0; row < nrows; row++) {
		int l = strlen(matches[row]);

		if (column_width < l)
			column_width = l;
	}
	column_width += 2;              /* min space for columns */
	ncols = cmdedit_termw / column_width;

	if (ncols > 1) {
		nrows /= ncols;
		if(nfiles % ncols)
			nrows++;        /* round up fractionals */
		column_width = -column_width;   /* for printf("%-Ns", ...); */
	} else {
		ncols = 1;
	}
	for (row = 0; row < nrows; row++) {
		int n = row;
		int nc;

		for(nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++)
			printf("%*s", column_width, matches[n]);
		printf("%s\n", matches[n]);
	}
}


static void input_tab(int *lastWasTab)
{
	/* Do TAB completion */
	static int num_matches;
	static char **matches;

	if (lastWasTab == 0) {          /* free all memory */
		if (matches) {
			while (num_matches > 0)
				free(matches[--num_matches]);
			free(matches);
			matches = (char **) NULL;
		}
		return;
	}
	if (! *lastWasTab) {

		char *tmp;
		int len_found;
		char matchBuf[BUFSIZ];
		int find_type;
		int recalc_pos;

		*lastWasTab = TRUE;             /* flop trigger */

		/* Make a local copy of the string -- up
		 * to the position of the cursor */
		tmp = strncpy(matchBuf, command_ps, cursor);
		tmp[cursor] = 0;

		find_type = find_match(matchBuf, &recalc_pos);

		/* Free up any memory already allocated */
		input_tab(0);

#ifdef CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION
		/* If the word starts with `~' and there is no slash in the word,
		 * then try completing this word as a username. */

		if (matchBuf[0] == '~' && strchr(matchBuf, '/') == 0)
			matches = username_tab_completion(matchBuf, &num_matches);
#endif
		/* Try to match any executable in our path and everything
		 * in the current working directory that matches.  */
		if (!matches)
			matches =
				exe_n_cwd_tab_completion(matchBuf,
					&num_matches, find_type);
		/* Remove duplicate found */
		if(matches) {
			int i, j;
			/* bubble */
			for(i=0; i<(num_matches-1); i++)
				for(j=i+1; j<num_matches; j++)
					if(matches[i]!=0 && matches[j]!=0 &&
						strcmp(matches[i], matches[j])==0) {
							free(matches[j]);
							matches[j]=0;
					}
			j=num_matches;
			num_matches = 0;
			for(i=0; i<j; i++)
				if(matches[i]) {
					if(!strcmp(matches[i], "./"))
						matches[i][1]=0;
					else if(!strcmp(matches[i], "../"))
						matches[i][2]=0;
					matches[num_matches++]=matches[i];
				}
		}
		/* Did we find exactly one match? */
		if (!matches || num_matches > 1) {
			char *tmp1;

			beep();
			if (!matches)
				return;         /* not found */
			/* sort */
			qsort(matches, num_matches, sizeof(char *), match_compare);

			/* find minimal match */
			tmp = bb_xstrdup(matches[0]);
			for (tmp1 = tmp; *tmp1; tmp1++)
				for (len_found = 1; len_found < num_matches; len_found++)
					if (matches[len_found][(tmp1 - tmp)] != *tmp1) {
						*tmp1 = 0;
						break;
					}
			if (*tmp == 0) {        /* have unique */
				free(tmp);
				return;
			}
		} else {                        /* one match */
			tmp = matches[0];
			/* for next completion current found */
			*lastWasTab = FALSE;
		}

		len_found = strlen(tmp);
		/* have space to placed match? */
		if ((len_found - strlen(matchBuf) + len) < BUFSIZ) {

			/* before word for match   */
			command_ps[cursor - recalc_pos] = 0;
			/* save   tail line        */
			strcpy(matchBuf, command_ps + cursor);
			/* add    match            */
			strcat(command_ps, tmp);
			/* add    tail             */
			strcat(command_ps, matchBuf);
			/* back to begin word for match    */
			input_backward(recalc_pos);
			/* new pos                         */
			recalc_pos = cursor + len_found;
			/* new len                         */
			len = strlen(command_ps);
			/* write out the matched command   */
			redraw(cmdedit_y, len - recalc_pos);
		}
		if (tmp != matches[0])
			free(tmp);
	} else {
		/* Ok -- the last char was a TAB.  Since they
		 * just hit TAB again, print a list of all the
		 * available choices... */
		if (matches && num_matches > 0) {
			int sav_cursor = cursor;        /* change goto_new_line() */

			/* Go to the next line */
			goto_new_line();
			showfiles(matches, num_matches);
			redraw(0, len - sav_cursor);
		}
	}
}
#endif  /* CONFIG_FEATURE_COMMAND_TAB_COMPLETION */

#if MAX_HISTORY >= 1
static void get_previous_history(void)
{
	if(command_ps[0] != 0 || history[cur_history] == 0) {
		free(history[cur_history]);
		history[cur_history] = bb_xstrdup(command_ps);
	}
	cur_history--;
}

static int get_next_history(void)
{
	int ch = cur_history;

	if (ch < n_history) {
		get_previous_history(); /* save the current history line */
		return (cur_history = ch+1);
	} else {
		beep();
		return 0;
	}
}

#ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
extern void load_history ( const char *fromfile )
{
	FILE *fp;
	int hi;

	/* cleanup old */

	for(hi = n_history; hi > 0; ) {
		hi--;
		free ( history [hi] );
	}

	if (( fp = fopen ( fromfile, "r" ))) {

		for ( hi = 0; hi < MAX_HISTORY; ) {
			char * hl = bb_get_chomped_line_from_file(fp);
			int l;

			if(!hl)
				break;
			l = strlen(hl);
			if(l >= BUFSIZ)
				hl[BUFSIZ-1] = 0;
			if(l == 0 || hl[0] == ' ') {
				free(hl);
				continue;
			}
			history [hi++] = hl;
		}
		fclose ( fp );
	}
	cur_history = n_history = hi;
}

extern void save_history ( const char *tofile )
{
	FILE *fp = fopen ( tofile, "w" );

	if ( fp ) {
		int i;

		for ( i = 0; i < n_history; i++ ) {
			fprintf(fp, "%s\n", history [i]);
		}
		fclose ( fp );
	}
}
#endif

#endif

enum {
	ESC = 27,
	DEL = 127,
};


/*
 * This function is used to grab a character buffer
 * from the input file descriptor and allows you to
 * a string with full command editing (sort of like
 * a mini readline).
 *
 * The following standard commands are not implemented:
 * ESC-b -- Move back one word
 * ESC-f -- Move forward one word
 * ESC-d -- Delete back one word
 * ESC-h -- Delete forward one word
 * CTL-t -- Transpose two characters
 *
 * Furthermore, the "vi" command editing keys are not implemented.
 *
 */


int cmdedit_read_input(char *prompt, char command[BUFSIZ])
{

	int break_out = 0;
	int lastWasTab = FALSE;
	unsigned char c = 0;

	/* prepare before init handlers */
	cmdedit_y = 0;  /* quasireal y, not true work if line > xt*yt */
	len = 0;
	command_ps = command;

	getTermSettings(0, (void *) &initial_settings);
	memcpy(&new_settings, &initial_settings, sizeof(struct termios));
	new_settings.c_lflag &= ~ICANON;        /* unbuffered input */
	/* Turn off echoing and CTRL-C, so we can trap it */
	new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
	/* Hmm, in linux c_cc[] not parsed if set ~ICANON */
	new_settings.c_cc[VMIN] = 1;
	new_settings.c_cc[VTIME] = 0;
	/* Turn off CTRL-C, so we can trap it */
#       ifndef _POSIX_VDISABLE
#               define _POSIX_VDISABLE '\0'
#       endif
	new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
	command[0] = 0;

	setTermSettings(0, (void *) &new_settings);
	handlers_sets |= SET_RESET_TERM;

	/* Now initialize things */
	cmdedit_init();
	/* Print out the command prompt */
	parse_prompt(prompt);

	while (1) {

		fflush(stdout);                 /* buffered out to fast */

		if (safe_read(0, &c, 1) < 1)
			/* if we can't read input then exit */
			goto prepare_to_die;

		switch (c) {
		case '\n':
		case '\r':
			/* Enter */
			goto_new_line();
			break_out = 1;
			break;
		case 1:
			/* Control-a -- Beginning of line */
			input_backward(cursor);
			break;
		case 2:
			/* Control-b -- Move back one character */
			input_backward(1);
			break;
		case 3:
			/* Control-c -- stop gathering input */
			goto_new_line();
#ifndef CONFIG_ASH
			command[0] = 0;
			len = 0;
			lastWasTab = FALSE;
			put_prompt();
#else
			len = 0;
			break_out = -1; /* to control traps */
#endif
			break;
		case 4:
			/* Control-d -- Delete one character, or exit
			 * if the len=0 and no chars to delete */
			if (len == 0) {
					errno = 0;
prepare_to_die:
#if !defined(CONFIG_ASH)
				printf("exit");
				goto_new_line();
				/* cmdedit_reset_term() called in atexit */
				exit(EXIT_SUCCESS);
#else
				/* to control stopped jobs */
				len = break_out = -1;
				break;
#endif
			} else {
				input_delete();
			}
			break;
		case 5:
			/* Control-e -- End of line */
			input_end();
			break;
		case 6:
			/* Control-f -- Move forward one character */
			input_forward();
			break;
		case '\b':
		case DEL:
			/* Control-h and DEL */
			input_backspace();
			break;
		case '\t':
#ifdef CONFIG_FEATURE_COMMAND_TAB_COMPLETION
			input_tab(&lastWasTab);
#endif
			break;
		case 11:
			/* Control-k -- clear to end of line */
			*(command + cursor) = 0;
			len = cursor;
			printf("\033[J");
			break;
		case 12:
			/* Control-l -- clear screen */
			printf("\033[H");
			redraw(0, len-cursor);
			break;
#if MAX_HISTORY >= 1
		case 14:
			/* Control-n -- Get next command in history */
			if (get_next_history())
				goto rewrite_line;
			break;
		case 16:
			/* Control-p -- Get previous command from history */
			if (cur_history > 0) {
				get_previous_history();
				goto rewrite_line;
			} else {
				beep();
			}
			break;
#endif
		case 21:
			/* Control-U -- Clear line before cursor */
			if (cursor) {
				strcpy(command, command + cursor);
				redraw(cmdedit_y, len -= cursor);
			}
			break;
		case 23:
			/* Control-W -- Remove the last word */
			while (cursor > 0 && isspace(command[cursor-1]))
				input_backspace();
			while (cursor > 0 &&!isspace(command[cursor-1]))
				input_backspace();
			break;
		case ESC:{
			/* escape sequence follows */
			if (safe_read(0, &c, 1) < 1)
				goto prepare_to_die;
			/* different vt100 emulations */
			if (c == '[' || c == 'O') {
				if (safe_read(0, &c, 1) < 1)
					goto prepare_to_die;
			}
			if (c >= '1' && c <= '9') {
				unsigned char dummy;

				if (safe_read(0, &dummy, 1) < 1)
					goto prepare_to_die;
				if(dummy != '~')
					c = 0;
			}
			switch (c) {
#ifdef CONFIG_FEATURE_COMMAND_TAB_COMPLETION
			case '\t':                      /* Alt-Tab */

				input_tab(&lastWasTab);
				break;
#endif
#if MAX_HISTORY >= 1
			case 'A':
				/* Up Arrow -- Get previous command from history */
				if (cur_history > 0) {
					get_previous_history();
					goto rewrite_line;
				} else {
					beep();
				}
				break;
			case 'B':
				/* Down Arrow -- Get next command in history */
				if (!get_next_history())
				break;
				/* Rewrite the line with the selected history item */
rewrite_line:
				/* change command */
				len = strlen(strcpy(command, history[cur_history]));
				/* redraw and go to end line */
				redraw(cmdedit_y, 0);
				break;
#endif
			case 'C':
				/* Right Arrow -- Move forward one character */
				input_forward();
				break;
			case 'D':
				/* Left Arrow -- Move back one character */
				input_backward(1);
				break;
			case '3':
				/* Delete */
				input_delete();
				break;
			case '1':
			case 'H':
				/* <Home> */
				input_backward(cursor);
				break;
			case '4':
			case 'F':
				/* <End> */
				input_end();
				break;
			default:
				c = 0;
				beep();
			}
			break;
		}

		default:        /* If it's regular input, do the normal thing */
#ifdef CONFIG_FEATURE_NONPRINTABLE_INVERSE_PUT
			/* Control-V -- Add non-printable symbol */
			if (c == 22) {
				if (safe_read(0, &c, 1) < 1)
					goto prepare_to_die;
				if (c == 0) {
					beep();
					break;
				}
			} else
#endif
			if (!Isprint(c))        /* Skip non-printable characters */
				break;

			if (len >= (BUFSIZ - 2))        /* Need to leave space for enter */
				break;

			len++;

			if (cursor == (len - 1)) {      /* Append if at the end of the line */
				*(command + cursor) = c;
				*(command + cursor + 1) = 0;
				cmdedit_set_out_char(0);
			} else {                        /* Insert otherwise */
				int sc = cursor;

				memmove(command + sc + 1, command + sc, len - sc);
				*(command + sc) = c;
				sc++;
				/* rewrite from cursor */
				input_end();
				/* to prev x pos + 1 */
				input_backward(cursor - sc);
			}

			break;
		}
		if (break_out)                  /* Enter is the command terminator, no more input. */
			break;

		if (c != '\t')
			lastWasTab = FALSE;
	}

	setTermSettings(0, (void *) &initial_settings);
	handlers_sets &= ~SET_RESET_TERM;

#if MAX_HISTORY >= 1
	/* Handle command history log */
	/* cleanup may be saved current command line */
	if (len> 0) {                                      /* no put empty line */
		int i = n_history;

		free(history[MAX_HISTORY]);
		history[MAX_HISTORY] = 0;
			/* After max history, remove the oldest command */
		if (i >= MAX_HISTORY) {
			free(history[0]);
			for(i = 0; i < (MAX_HISTORY-1); i++)
				history[i] = history[i+1];
		}
		history[i++] = bb_xstrdup(command);
		cur_history = i;
		n_history = i;
#if defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
		num_ok_lines++;
#endif
	}
#else  /* MAX_HISTORY < 1 */
#if defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
	if (len > 0) {              /* no put empty line */
		num_ok_lines++;
	}
#endif
#endif  /* MAX_HISTORY >= 1 */
	if (break_out > 0) {
		command[len++] = '\n';          /* set '\n' */
		command[len] = 0;
	}
#if defined(CONFIG_FEATURE_CLEAN_UP) && defined(CONFIG_FEATURE_COMMAND_TAB_COMPLETION)
	input_tab(0);                           /* strong free */
#endif
#if defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
	free(cmdedit_prompt);
#endif
	cmdedit_reset_term();
	return len;
}



#endif  /* CONFIG_FEATURE_COMMAND_EDITING */


#ifdef TEST

const char *bb_applet_name = "debug stuff usage";

#ifdef CONFIG_FEATURE_NONPRINTABLE_INVERSE_PUT
#include <locale.h>
#endif

int main(int argc, char **argv)
{
	char buff[BUFSIZ];
	char *prompt =
#if defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
		"\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:\
\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] \
\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
#else
		"% ";
#endif

#ifdef CONFIG_FEATURE_NONPRINTABLE_INVERSE_PUT
	setlocale(LC_ALL, "");
#endif
	while(1) {
		int l;
		l = cmdedit_read_input(prompt, buff);
		if(l > 0 && buff[l-1] == '\n') {
			buff[l-1] = 0;
			printf("*** cmdedit_read_input() returned line =%s=\n", buff);
		} else {
			break;
		}
	}
	printf("*** cmdedit_read_input() detect ^D\n");
	return 0;
}

#endif  /* TEST */