source: MondoRescue/branches/2.2.9/mindi-busybox/libbb/lineedit.c@ 2887

/* vi: set sw=4 ts=4: */
/*
 * Command line 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, more needs 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.
 *
 * The following readline-like commands are not implemented:
 * ESC-b -- Move back one word
 * ESC-f -- Move forward one word
 * ESC-d -- Delete forward one word
 * CTL-t -- Transpose two characters
 *
 * lineedit does not know that the terminal escape sequences do not
 * take up space on the screen. The redisplay code assumes, unless
 * told otherwise, that each character in the prompt is a printable
 * character that takes up one character position on the screen.
 * You need to tell lineedit that some sequences of characters
 * in the prompt take up no screen space. Compatibly with readline,
 * use the \[ escape to begin a sequence of non-printing characters,
 * and the \] escape to signal the end of such a sequence. Example:
 *
 * PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
 */
#include "libbb.h"
#include "unicode.h"

#ifdef TEST
# define ENABLE_FEATURE_EDITING 0
# define ENABLE_FEATURE_TAB_COMPLETION 0
# define ENABLE_FEATURE_USERNAME_COMPLETION 0
#endif


/* Entire file (except TESTing part) sits inside this #if */
#if ENABLE_FEATURE_EDITING


#define ENABLE_USERNAME_OR_HOMEDIR \
    (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
#define IF_USERNAME_OR_HOMEDIR(...)
#if ENABLE_USERNAME_OR_HOMEDIR
# undef IF_USERNAME_OR_HOMEDIR
# define IF_USERNAME_OR_HOMEDIR(...) __VA_ARGS__
#endif


#undef CHAR_T
#if ENABLE_UNICODE_SUPPORT
# define BB_NUL ((wchar_t)0)
# define CHAR_T wchar_t
static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
# if ENABLE_FEATURE_EDITING_VI
static bool BB_isalnum(CHAR_T c) { return ((unsigned)c < 256 && isalnum(c)); }
# endif
static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
# undef isspace
# undef isalnum
# undef ispunct
# undef isprint
# define isspace isspace_must_not_be_used
# define isalnum isalnum_must_not_be_used
# define ispunct ispunct_must_not_be_used
# define isprint isprint_must_not_be_used
#else
# define BB_NUL '\0'
# define CHAR_T char
# define BB_isspace(c) isspace(c)
# define BB_isalnum(c) isalnum(c)
# define BB_ispunct(c) ispunct(c)
#endif
#if ENABLE_UNICODE_PRESERVE_BROKEN
# define unicode_mark_raw_byte(wc)   ((wc) | 0x20000000)
# define unicode_is_raw_byte(wc)     ((wc) & 0x20000000)
#else
# define unicode_is_raw_byte(wc)     0
#endif


#define ESC "\033"

#define SEQ_CLEAR_TILL_END_OF_SCREEN  ESC"[J"
//#define SEQ_CLEAR_TILL_END_OF_LINE  ESC"[K"


enum {
    MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
                  ? CONFIG_FEATURE_EDITING_MAX_LEN
                  : 0x7ff0
};

#if ENABLE_USERNAME_OR_HOMEDIR
static const char null_str[] ALIGN1 = "";
#endif

/* We try to minimize both static and stack usage. */
struct lineedit_statics {
    line_input_t *state;

    volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
    sighandler_t previous_SIGWINCH_handler;

    unsigned cmdedit_x;        /* real x (col) terminal position */
    unsigned cmdedit_y;        /* pseudoreal y (row) terminal position */
    unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */

    unsigned cursor;
    int command_len; /* must be signed */
    /* signed maxsize: we want x in "if (x > S.maxsize)"
     * to _not_ be promoted to unsigned */
    int maxsize;
    CHAR_T *command_ps;

    const char *cmdedit_prompt;
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
    int num_ok_lines; /* = 1; */
#endif

#if ENABLE_USERNAME_OR_HOMEDIR
    char *user_buf;
    char *home_pwd_buf; /* = (char*)null_str; */
#endif

#if ENABLE_FEATURE_TAB_COMPLETION
    char **matches;
    unsigned num_matches;
#endif

#if ENABLE_FEATURE_EDITING_VI
# define DELBUFSIZ 128
    CHAR_T *delptr;
    smallint newdelflag;     /* whether delbuf should be reused yet */
    CHAR_T delbuf[DELBUFSIZ];  /* a place to store deleted characters */
#endif
#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
    smallint sent_ESC_br6n;
#endif
};

/* See lineedit_ptr_hack.c */
extern struct lineedit_statics *const lineedit_ptr_to_statics;

#define S (*lineedit_ptr_to_statics)
#define state            (S.state           )
#define cmdedit_termw    (S.cmdedit_termw   )
#define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
#define cmdedit_x        (S.cmdedit_x       )
#define cmdedit_y        (S.cmdedit_y       )
#define cmdedit_prmt_len (S.cmdedit_prmt_len)
#define cursor           (S.cursor          )
#define command_len      (S.command_len     )
#define command_ps       (S.command_ps      )
#define cmdedit_prompt   (S.cmdedit_prompt  )
#define num_ok_lines     (S.num_ok_lines    )
#define user_buf         (S.user_buf        )
#define home_pwd_buf     (S.home_pwd_buf    )
#define matches          (S.matches         )
#define num_matches      (S.num_matches     )
#define delptr           (S.delptr          )
#define newdelflag       (S.newdelflag      )
#define delbuf           (S.delbuf          )

#define INIT_S() do { \
    (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
    barrier(); \
    cmdedit_termw = 80; \
    IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
    IF_USERNAME_OR_HOMEDIR(home_pwd_buf = (char*)null_str;) \
} while (0)
static void deinit_S(void)
{
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
    /* This one is allocated only if FANCY_PROMPT is on
     * (otherwise it points to verbatim prompt (NOT malloced)) */
    free((char*)cmdedit_prompt);
#endif
#if ENABLE_USERNAME_OR_HOMEDIR
    free(user_buf);
    if (home_pwd_buf != null_str)
        free(home_pwd_buf);
#endif
    free(lineedit_ptr_to_statics);
}
#define DEINIT_S() deinit_S()


#if ENABLE_UNICODE_SUPPORT
static size_t load_string(const char *src, int maxsize)
{
    ssize_t len = mbstowcs(command_ps, src, maxsize - 1);
    if (len < 0)
        len = 0;
    command_ps[len] = BB_NUL;
    return len;
}
static unsigned save_string(char *dst, unsigned maxsize)
{
# if !ENABLE_UNICODE_PRESERVE_BROKEN
    ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
    if (len < 0)
        len = 0;
    dst[len] = '\0';
    return len;
# else
    unsigned dstpos = 0;
    unsigned srcpos = 0;

    maxsize--;
    while (dstpos < maxsize) {
        wchar_t wc;
        int n = srcpos;

        /* Convert up to 1st invalid byte (or up to end) */
        while ((wc = command_ps[srcpos]) != BB_NUL
            && !unicode_is_raw_byte(wc)
        ) {
            srcpos++;
        }
        command_ps[srcpos] = BB_NUL;
        n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
        if (n < 0) /* should not happen */
            break;
        dstpos += n;
        if (wc == BB_NUL) /* usually is */
            break;

        /* We do have invalid byte here! */
        command_ps[srcpos] = wc; /* restore it */
        srcpos++;
        if (dstpos == maxsize)
            break;
        dst[dstpos++] = (char) wc;
    }
    dst[dstpos] = '\0';
    return dstpos;
# endif
}
/* I thought just fputwc(c, stdout) would work. But no... */
static void BB_PUTCHAR(wchar_t c)
{
    char buf[MB_CUR_MAX + 1];
    mbstate_t mbst = { 0 };
    ssize_t len;

    len = wcrtomb(buf, c, &mbst);
    if (len > 0) {
        buf[len] = '\0';
        fputs(buf, stdout);
    }
}
# if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
static wchar_t adjust_width_and_validate_wc(unsigned *width_adj, wchar_t wc)
# else
static wchar_t adjust_width_and_validate_wc(wchar_t wc)
#  define adjust_width_and_validate_wc(width_adj, wc) \
    ((*(width_adj))++, adjust_width_and_validate_wc(wc))
# endif
{
    int w = 1;

    if (unicode_status == UNICODE_ON) {
        if (wc > CONFIG_LAST_SUPPORTED_WCHAR) {
            /* note: also true for unicode_is_raw_byte(wc) */
            goto subst;
        }
        w = wcwidth(wc);
        if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0)
         || (!ENABLE_UNICODE_COMBINING_WCHARS && w <= 0)
         || (!ENABLE_UNICODE_WIDE_WCHARS && w > 1)
        ) {
 subst:
            w = 1;
            wc = CONFIG_SUBST_WCHAR;
        }
    }

# if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
    *width_adj += w;
#endif
    return wc;
}
#else /* !UNICODE */
static size_t load_string(const char *src, int maxsize)
{
    safe_strncpy(command_ps, src, maxsize);
    return strlen(command_ps);
}
# if ENABLE_FEATURE_TAB_COMPLETION
static void save_string(char *dst, unsigned maxsize)
{
    safe_strncpy(dst, command_ps, maxsize);
}
# endif
# define BB_PUTCHAR(c) bb_putchar(c)
/* Should never be called: */
int adjust_width_and_validate_wc(unsigned *width_adj, int wc);
#endif


/* Put 'command_ps[cursor]', cursor++.
 * Advance cursor on screen. If we reached right margin, scroll text up
 * and remove terminal margin effect by printing 'next_char' */
#define HACK_FOR_WRONG_WIDTH 1
static void put_cur_glyph_and_inc_cursor(void)
{
    CHAR_T c = command_ps[cursor];
    unsigned width = 0;
    int ofs_to_right;

    if (c == BB_NUL) {
        /* erase character after end of input string */
        c = ' ';
    } else {
        /* advance cursor only if we aren't at the end yet */
        cursor++;
        if (unicode_status == UNICODE_ON) {
            IF_UNICODE_WIDE_WCHARS(width = cmdedit_x;)
            c = adjust_width_and_validate_wc(&cmdedit_x, c);
            IF_UNICODE_WIDE_WCHARS(width = cmdedit_x - width;)
        } else {
            cmdedit_x++;
        }
    }

    ofs_to_right = cmdedit_x - cmdedit_termw;
    if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right <= 0) {
        /* c fits on this line */
        BB_PUTCHAR(c);
    }

    if (ofs_to_right >= 0) {
        /* we go to the next line */
#if HACK_FOR_WRONG_WIDTH
        /* This works better if our idea of term width is wrong
         * and it is actually wider (often happens on serial lines).
         * Printing CR,LF *forces* cursor to next line.
         * OTOH if terminal width is correct AND terminal does NOT
         * have automargin (IOW: it is moving cursor to next line
         * by itself (which is wrong for VT-10x terminals)),
         * this will break things: there will be one extra empty line */
        puts("\r"); /* + implicit '\n' */
#else
        /* VT-10x terminals don't wrap cursor to next line when last char
         * on the line is printed - cursor stays "over" this char.
         * Need to print _next_ char too (first one to appear on next line)
         * to make cursor move down to next line.
         */
        /* Works ok only if cmdedit_termw is correct. */
        c = command_ps[cursor];
        if (c == BB_NUL)
            c = ' ';
        BB_PUTCHAR(c);
        bb_putchar('\b');
#endif
        cmdedit_y++;
        if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right == 0) {
            width = 0;
        } else { /* ofs_to_right > 0 */
            /* wide char c didn't fit on prev line */
            BB_PUTCHAR(c);
        }
        cmdedit_x = width;
    }
}

/* Move to end of line (by printing all chars till the end) */
static void put_till_end_and_adv_cursor(void)
{
    while (cursor < command_len)
        put_cur_glyph_and_inc_cursor();
}

/* Go to the next line */
static void goto_new_line(void)
{
    put_till_end_and_adv_cursor();
    if (cmdedit_x != 0)
        bb_putchar('\n');
}

static void beep(void)
{
    bb_putchar('\007');
}

static void put_prompt(void)
{
    unsigned w;

    fputs(cmdedit_prompt, stdout);
    fflush_all();
    cursor = 0;
    w = cmdedit_termw; /* read volatile var once */
    cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
    cmdedit_x = cmdedit_prmt_len % w;
}

/* Move back one character */
/* (optimized for slow terminals) */
static void input_backward(unsigned num)
{
    if (num > cursor)
        num = cursor;
    if (num == 0)
        return;
    cursor -= num;

    if ((ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS)
     && unicode_status == UNICODE_ON
    ) {
        /* correct NUM to be equal to _screen_ width */
        int n = num;
        num = 0;
        while (--n >= 0)
            adjust_width_and_validate_wc(&num, command_ps[cursor + n]);
        if (num == 0)
            return;
    }

    if (cmdedit_x >= num) {
        cmdedit_x -= num;
        if (num <= 4) {
            /* This is longer by 5 bytes on x86.
             * Also gets miscompiled for ARM users
             * (busybox.net/bugs/view.php?id=2274).
             * printf(("\b\b\b\b" + 4) - num);
             * return;
             */
            do {
                bb_putchar('\b');
            } while (--num);
            return;
        }
        printf(ESC"[%uD", num);
        return;
    }

    /* Need to go one or more lines up */
    if (ENABLE_UNICODE_WIDE_WCHARS) {
        /* With wide chars, it is hard to "backtrack"
         * and reliably figure out where to put cursor.
         * Example (<> is a wide char; # is an ordinary char, _ cursor):
         * |prompt: <><> |
         * |<><><><><><> |
         * |_            |
         * and user presses left arrow. num = 1, cmdedit_x = 0,
         * We need to go up one line, and then - how do we know that
         * we need to go *10* positions to the right? Because
         * |prompt: <>#<>|
         * |<><><>#<><><>|
         * |_            |
         * in this situation we need to go *11* positions to the right.
         *
         * A simpler thing to do is to redraw everything from the start
         * up to new cursor position (which is already known):
         */
        unsigned sv_cursor;
        /* go to 1st column; go up to first line */
        printf("\r" ESC"[%uA", cmdedit_y);
        cmdedit_y = 0;
        sv_cursor = cursor;
        put_prompt(); /* sets cursor to 0 */
        while (cursor < sv_cursor)
            put_cur_glyph_and_inc_cursor();
    } else {
        int lines_up;
        unsigned width;
        /* num = chars to go back from the beginning of current line: */
        num -= cmdedit_x;
        width = cmdedit_termw; /* read volatile var once */
        /* num=1...w: one line up, w+1...2w: two, etc: */
        lines_up = 1 + (num - 1) / width;
        cmdedit_x = (width * cmdedit_y - num) % width;
        cmdedit_y -= lines_up;
        /* go to 1st column; go up */
        printf("\r" ESC"[%uA", lines_up);
        /* go to correct column.
         * xterm, konsole, Linux VT interpret 0 as 1 below! wow.
         * need to *make sure* we skip it if cmdedit_x == 0 */
        if (cmdedit_x)
            printf(ESC"[%uC", cmdedit_x);
    }
}

/* draw prompt, editor line, and clear tail */
static void redraw(int y, int back_cursor)
{
    if (y > 0) /* up y lines */
        printf(ESC"[%uA", y);
    bb_putchar('\r');
    put_prompt();
    put_till_end_and_adv_cursor();
    printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
    input_backward(back_cursor);
}

/* Delete the char in front of the cursor, optionally saving it
 * for later putback */
#if !ENABLE_FEATURE_EDITING_VI
static void input_delete(void)
#define input_delete(save) input_delete()
#else
static void input_delete(int save)
#endif
{
    int j = cursor;

    if (j == (int)command_len)
        return;

#if ENABLE_FEATURE_EDITING_VI
    if (save) {
        if (newdelflag) {
            delptr = delbuf;
            newdelflag = 0;
        }
        if ((delptr - delbuf) < DELBUFSIZ)
            *delptr++ = command_ps[j];
    }
#endif

    memmove(command_ps + j, command_ps + j + 1,
            /* (command_len + 1 [because of NUL]) - (j + 1)
             * simplified into (command_len - j) */
            (command_len - j) * sizeof(command_ps[0]));
    command_len--;
    put_till_end_and_adv_cursor();
    /* Last char is still visible, erase it (and more) */
    printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
    input_backward(cursor - j);     /* back to old pos cursor */
}

#if ENABLE_FEATURE_EDITING_VI
static void put(void)
{
    int ocursor;
    int j = delptr - delbuf;

    if (j == 0)
        return;
    ocursor = cursor;
    /* open hole and then fill it */
    memmove(command_ps + cursor + j, command_ps + cursor,
            (command_len - cursor + 1) * sizeof(command_ps[0]));
    memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
    command_len += j;
    put_till_end_and_adv_cursor();
    input_backward(cursor - ocursor - j + 1); /* at end of new text */
}
#endif

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

/* Move forward one character */
static void input_forward(void)
{
    if (cursor < command_len)
        put_cur_glyph_and_inc_cursor();
}

#if ENABLE_FEATURE_TAB_COMPLETION

//FIXME:
//needs to be more clever: currently it thinks that "foo\ b<TAB>
//matches the file named "foo bar", which is untrue.
//Also, perhaps "foo b<TAB> needs to complete to "foo bar" <cursor>,
//not "foo bar <cursor>...

static void free_tab_completion_data(void)
{
    if (matches) {
        while (num_matches)
            free(matches[--num_matches]);
        free(matches);
        matches = NULL;
    }
}

static void add_match(char *matched)
{
    matches = xrealloc_vector(matches, 4, num_matches);
    matches[num_matches] = matched;
    num_matches++;
}

# if ENABLE_FEATURE_USERNAME_COMPLETION
/* Replace "~user/..." with "/homedir/...".
 * The parameter is malloced, free it or return it
 * unchanged if no user is matched.
 */
static char *username_path_completion(char *ud)
{
    struct passwd *entry;
    char *tilde_name = ud;
    char *home = NULL;

    ud++; /* skip ~ */
    if (*ud == '/') {       /* "~/..." */
        home = home_pwd_buf;
    } else {
        /* "~user/..." */
        ud = strchr(ud, '/');
        *ud = '\0';           /* "~user" */
        entry = getpwnam(tilde_name + 1);
        *ud = '/';            /* restore "~user/..." */
        if (entry)
            home = entry->pw_dir;
    }
    if (home) {
        ud = concat_path_file(home, ud);
        free(tilde_name);
        tilde_name = ud;
    }
    return tilde_name;
}

/* ~use<tab> - find all users with this prefix.
 * Return the length of the prefix used for matching.
 */
static NOINLINE unsigned complete_username(const char *ud)
{
    /* Using _r function to avoid pulling in static buffers */
    char line_buff[256];
    struct passwd pwd;
    struct passwd *result;
    unsigned userlen;

    ud++; /* skip ~ */
    userlen = strlen(ud);

    setpwent();
    while (!getpwent_r(&pwd, line_buff, sizeof(line_buff), &result)) {
        /* Null usernames should result in all users as possible completions. */
        if (/*!userlen || */ strncmp(ud, pwd.pw_name, userlen) == 0) {
            add_match(xasprintf("~%s/", pwd.pw_name));
        }
    }
    endpwent();

    return 1 + userlen;
}
# endif  /* FEATURE_USERNAME_COMPLETION */

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

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

    if (state->flags & WITH_PATH_LOOKUP)
        pth = state->path_lookup;
    else
        pth = getenv("PATH");

    /* PATH="" or PATH=":"? */
    if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
        return 1;

    tmp = (char*)pth;
    npth = 1; /* path component count */
    while (1) {
        tmp = strchr(tmp, ':');
        if (!tmp)
            break;
        tmp++;
        if (*tmp == '\0')
            break;  /* :<empty> */
        npth++;
    }

    *p = res = xmalloc(npth * sizeof(res[0]));
    res[0] = tmp = xstrdup(pth);
    npth = 1;
    while (1) {
        tmp = strchr(tmp, ':');
        if (!tmp)
            break;
        *tmp++ = '\0'; /* ':' -> '\0' */
        if (*tmp == '\0')
            break; /* :<empty> */
        res[npth++] = tmp;
    }
    return npth;
}

/* Complete command, directory or file name.
 * Return the length of the prefix used for matching.
 */
static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
{
    char *path1[1];
    char **paths = path1;
    int npaths;
    int i;
    unsigned pf_len;
    const char *pfind;
    char *dirbuf = NULL;

    npaths = 1;
    path1[0] = (char*)".";

    pfind = strrchr(command, '/');
    if (!pfind) {
        if (type == FIND_EXE_ONLY)
            npaths = path_parse(&paths);
        pfind = command;
    } else {
        /* point to 'l' in "..../last_component" */
        pfind++;
        /* dirbuf = ".../.../.../" */
        dirbuf = xstrndup(command, pfind - command);
# if ENABLE_FEATURE_USERNAME_COMPLETION
        if (dirbuf[0] == '~')   /* ~/... or ~user/... */
            dirbuf = username_path_completion(dirbuf);
# endif
        path1[0] = dirbuf;
    }
    pf_len = strlen(pfind);

    for (i = 0; i < npaths; i++) {
        DIR *dir;
        struct dirent *next;
        struct stat st;
        char *found;

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

        while ((next = readdir(dir)) != NULL) {
            unsigned len;
            const char *name_found = next->d_name;

            /* .../<tab>: bash 3.2.0 shows dotfiles, but not . and .. */
            if (!pfind[0] && DOT_OR_DOTDOT(name_found))
                continue;
            /* match? */
            if (strncmp(name_found, pfind, pf_len) != 0)
                continue; /* no */

            found = concat_path_file(paths[i], name_found);
            /* NB: stat() first so that we see is it a directory;
             * but if that fails, use lstat() so that
             * we still match dangling links */
            if (stat(found, &st) && lstat(found, &st))
                goto cont; /* hmm, remove in progress? */

            /* Save only name */
            len = strlen(name_found);
            found = xrealloc(found, len + 2); /* +2: for slash and NUL */
            strcpy(found, name_found);

            if (S_ISDIR(st.st_mode)) {
                /* name is a directory, add slash */
                found[len] = '/';
                found[len + 1] = '\0';
            } else {
                /* skip files if looking for dirs only (example: cd) */
                if (type == FIND_DIR_ONLY)
                    goto cont;
            }
            /* add it to the list */
            add_match(found);
            continue;
 cont:
            free(found);
        }
        closedir(dir);
    } /* for every path */

    if (paths != path1) {
        free(paths[0]); /* allocated memory is only in first member */
        free(paths);
    }
    free(dirbuf);

    return pf_len;
}

/* build_match_prefix:
 * On entry, match_buf contains everything up to cursor at the moment <tab>
 * was pressed. This function looks at it, figures out what part of it
 * constitutes the command/file/directory prefix to use for completion,
 * and rewrites match_buf to contain only that part.
 */
#define dbg_bmp 0
/* Helpers: */
/* QUOT is used on elements of int_buf[], which are bytes,
 * not Unicode chars. Therefore it works correctly even in Unicode mode.
 */
#define QUOT (UCHAR_MAX+1)
static void remove_chunk(int16_t *int_buf, int beg, int end)
{
    /* beg must be <= end */
    if (beg == end)
        return;

    while ((int_buf[beg] = int_buf[end]) != 0)
        beg++, end++;

    if (dbg_bmp) {
        int i;
        for (i = 0; int_buf[i]; i++)
            bb_putchar((unsigned char)int_buf[i]);
        bb_putchar('\n');
    }
}
/* Caller ensures that match_buf points to a malloced buffer
 * big enough to hold strlen(match_buf)*2 + 2
 */
static NOINLINE int build_match_prefix(char *match_buf)
{
    int i, j;
    int command_mode;
    int16_t *int_buf = (int16_t*)match_buf;

    if (dbg_bmp) printf("\n%s\n", match_buf);

    /* Copy in reverse order, since they overlap */
    i = strlen(match_buf);
    do {
        int_buf[i] = (unsigned char)match_buf[i];
        i--;
    } while (i >= 0);

    /* Mark every \c as "quoted c" */
    for (i = 0; int_buf[i]; i++) {
        if (int_buf[i] == '\\') {
            remove_chunk(int_buf, i, i + 1);
            int_buf[i] |= QUOT;
        }
    }
    /* Quote-mark "chars" and 'chars', drop delimiters */
    {
        int in_quote = 0;
        i = 0;
        while (int_buf[i]) {
            int cur = int_buf[i];
            if (!cur)
                break;
            if (cur == '\'' || cur == '"') {
                if (!in_quote || (cur == in_quote)) {
                    in_quote ^= cur;
                    remove_chunk(int_buf, i, i + 1);
                    continue;
                }
            }
            if (in_quote)
                int_buf[i] = cur | QUOT;
            i++;
        }
    }

    /* Remove everything up to command delimiters:
     * ';' ';;' '&' '|' '&&' '||',
     * but careful with '>&' '<&' '>|'
     */
    for (i = 0; int_buf[i]; i++) {
        int cur = int_buf[i];
        if (cur == ';' || cur == '&' || cur == '|') {
            int prev = i ? int_buf[i - 1] : 0;
            if (cur == '&' && (prev == '>' || prev == '<')) {
                continue;
            } else if (cur == '|' && prev == '>') {
                continue;
            }
            remove_chunk(int_buf, 0, i + 1 + (cur == int_buf[i + 1]));
            i = -1;  /* back to square 1 */
        }
    }
    /* Remove all `cmd` */
    for (i = 0; int_buf[i]; i++) {
        if (int_buf[i] == '`') {
            for (j = i + 1; int_buf[j]; j++) {
                if (int_buf[j] == '`') {
                    /* `cmd` should count as a word:
                     * `cmd` c<tab> should search for files c*,
                     * not commands c*. Therefore we don't drop
                     * `cmd` entirely, we replace it with single `.
                     */
                    remove_chunk(int_buf, i, j);
                    goto next;
                }
            }
            /* No closing ` - command mode, remove all up to ` */
            remove_chunk(int_buf, 0, i + 1);
            break;
 next: ;
        }
    }

    /* Remove "cmd (" and "cmd {"
     * Example: "if { c<tab>"
     * In this example, c should be matched as command pfx.
     */
    for (i = 0; int_buf[i]; i++) {
        if (int_buf[i] == '(' || int_buf[i] == '{') {
            remove_chunk(int_buf, 0, i + 1);
            i = -1;  /* back to square 1 */
        }
    }

    /* Remove leading unquoted spaces */
    for (i = 0; int_buf[i]; i++)
        if (int_buf[i] != ' ')
            break;
    remove_chunk(int_buf, 0, i);

    /* Determine completion mode */
    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
             && (char)int_buf[0] == 'c'
             && (char)int_buf[1] == 'd'
             && i == 2 /* -> int_buf[2] == ' ' */
            ) {
                command_mode = FIND_DIR_ONLY;
            } else {
                command_mode = FIND_FILE_ONLY;
                break;
            }
        }
    }
    if (dbg_bmp) printf("command_mode(0:exe/1:dir/2:file):%d\n", command_mode);

    /* Remove everything except last word */
    for (i = 0; int_buf[i]; i++) /* quasi-strlen(int_buf) */
        continue;
    for (--i; i >= 0; i--) {
        int cur = int_buf[i];
        if (cur == ' ' || cur == '<' || cur == '>' || cur == '|' || cur == '&') {
            remove_chunk(int_buf, 0, i + 1);
            break;
        }
    }

    /* Convert back to string of _chars_ */
    i = 0;
    while ((match_buf[i] = int_buf[i]) != '\0')
        i++;

    if (dbg_bmp) printf("final match_buf:'%s'\n", match_buf);

    return command_mode;
}

/*
 * Display by column (original idea from ls applet,
 * very optimized by me [Vladimir] :)
 */
static void showfiles(void)
{
    int ncols, row;
    int column_width = 0;
    int nfiles = num_matches;
    int nrows = nfiles;
    int l;

    /* find the longest file name - use that as the column width */
    for (row = 0; row < nrows; row++) {
        l = unicode_strwidth(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 */
    } 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%-*s", matches[n],
                (int)(column_width - unicode_strwidth(matches[n])), ""
            );
        }
        if (ENABLE_UNICODE_SUPPORT)
            puts(printable_string(NULL, matches[n]));
        else
            puts(matches[n]);
    }
}

static const char *is_special_char(char c)
{
    return strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", c);
}

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

    while (*found) {
        if (is_special_char(*found))
            s[l++] = '\\';
        s[l++] = *found++;
    }
    /* s[l] = '\0'; - already is */
    return s;
}

/* Do TAB completion */
static NOINLINE void input_tab(smallint *lastWasTab)
{
    char *chosen_match;
    char *match_buf;
    size_t len_found;
    /* Length of string used for matching */
    unsigned match_pfx_len = match_pfx_len;
    int find_type;
# if ENABLE_UNICODE_SUPPORT
    /* cursor pos in command converted to multibyte form */
    int cursor_mb;
# endif
    if (!(state->flags & TAB_COMPLETION))
        return;

    if (*lastWasTab) {
        /* The last char was a TAB too.
         * Print a list of all the available choices.
         */
        if (num_matches > 0) {
            /* cursor will be changed by goto_new_line() */
            int sav_cursor = cursor;
            goto_new_line();
            showfiles();
            redraw(0, command_len - sav_cursor);
        }
        return;
    }

    *lastWasTab = 1;
    chosen_match = NULL;

    /* Make a local copy of the string up to the position of the cursor.
     * build_match_prefix will expand it into int16_t's, need to allocate
     * twice as much as the string_len+1.
     * (we then also (ab)use this extra space later - see (**))
     */
    match_buf = xmalloc(MAX_LINELEN * sizeof(int16_t));
# if !ENABLE_UNICODE_SUPPORT
    save_string(match_buf, cursor + 1); /* +1 for NUL */
# else
    {
        CHAR_T wc = command_ps[cursor];
        command_ps[cursor] = BB_NUL;
        save_string(match_buf, MAX_LINELEN);
        command_ps[cursor] = wc;
        cursor_mb = strlen(match_buf);
    }
# endif
    find_type = build_match_prefix(match_buf);

    /* Free up any memory already allocated */
    free_tab_completion_data();

# if ENABLE_FEATURE_USERNAME_COMPLETION
    /* If the word starts with ~ and there is no slash in the word,
     * then try completing this word as a username. */
    if (state->flags & USERNAME_COMPLETION)
        if (match_buf[0] == '~' && strchr(match_buf, '/') == NULL)
            match_pfx_len = complete_username(match_buf);
# endif
    /* If complete_username() did not match,
     * try to match a command in $PATH, or a directory, or a file */
    if (!matches)
        match_pfx_len = complete_cmd_dir_file(match_buf, find_type);

    /* Account for backslashes which will be inserted
     * by quote_special_chars() later */
    {
        const char *e = match_buf + strlen(match_buf);
        const char *s = e - match_pfx_len;
        while (s < e)
            if (is_special_char(*s++))
                match_pfx_len++;
    }

    /* Remove duplicates */
    if (matches) {
        unsigned i, n = 0;
        qsort_string_vector(matches, num_matches);
        for (i = 0; i < num_matches - 1; ++i) {
            //if (matches[i] && matches[i+1]) { /* paranoia */
                if (strcmp(matches[i], matches[i+1]) == 0) {
                    free(matches[i]);
                    //matches[i] = NULL; /* paranoia */
                } else {
                    matches[n++] = matches[i];
                }
            //}
        }
        matches[n++] = matches[i];
        num_matches = n;
    }

    /* Did we find exactly one match? */
    if (num_matches != 1) { /* no */
        char *cp;
        beep();
        if (!matches)
            goto ret; /* no matches at all */
        /* Find common prefix */
        chosen_match = xstrdup(matches[0]);
        for (cp = chosen_match; *cp; cp++) {
            unsigned n;
            for (n = 1; n < num_matches; n++) {
                if (matches[n][cp - chosen_match] != *cp) {
                    goto stop;
                }
            }
        }
 stop:
        if (cp == chosen_match) { /* have unique prefix? */
            goto ret; /* no */
        }
        *cp = '\0';
        cp = quote_special_chars(chosen_match);
        free(chosen_match);
        chosen_match = cp;
        len_found = strlen(chosen_match);
    } else {                        /* exactly one match */
        /* Next <tab> is not a double-tab */
        *lastWasTab = 0;

        chosen_match = quote_special_chars(matches[0]);
        len_found = strlen(chosen_match);
        if (chosen_match[len_found-1] != '/') {
            chosen_match[len_found] = ' ';
            chosen_match[++len_found] = '\0';
        }
    }

# if !ENABLE_UNICODE_SUPPORT
    /* Have space to place the match? */
    /* The result consists of three parts with these lengths: */
    /* cursor + (len_found - match_pfx_len) + (command_len - cursor) */
    /* it simplifies into: */
    if ((int)(len_found - match_pfx_len + command_len) < S.maxsize) {
        int pos;
        /* save tail */
        strcpy(match_buf, &command_ps[cursor]);
        /* add match and tail */
        sprintf(&command_ps[cursor], "%s%s", chosen_match + match_pfx_len, match_buf);
        command_len = strlen(command_ps);
        /* new pos */
        pos = cursor + len_found - match_pfx_len;
        /* write out the matched command */
        redraw(cmdedit_y, command_len - pos);
    }
# else
    {
        /* Use 2nd half of match_buf as scratch space - see (**) */
        char *command = match_buf + MAX_LINELEN;
        int len = save_string(command, MAX_LINELEN);
        /* Have space to place the match? */
        /* cursor_mb + (len_found - match_pfx_len) + (len - cursor_mb) */
        if ((int)(len_found - match_pfx_len + len) < MAX_LINELEN) {
            int pos;
            /* save tail */
            strcpy(match_buf, &command[cursor_mb]);
            /* where do we want to have cursor after all? */
            strcpy(&command[cursor_mb], chosen_match + match_pfx_len);
            len = load_string(command, S.maxsize);
            /* add match and tail */
            sprintf(&command[cursor_mb], "%s%s", chosen_match + match_pfx_len, match_buf);
            command_len = load_string(command, S.maxsize);
            /* write out the matched command */
            /* paranoia: load_string can return 0 on conv error,
             * prevent passing pos = (0 - 12) to redraw */
            pos = command_len - len;
            redraw(cmdedit_y, pos >= 0 ? pos : 0);
        }
    }
# endif
 ret:
    free(chosen_match);
    free(match_buf);
}

#endif  /* FEATURE_TAB_COMPLETION */


line_input_t* FAST_FUNC new_line_input_t(int flags)
{
    line_input_t *n = xzalloc(sizeof(*n));
    n->flags = flags;
    return n;
}


#if MAX_HISTORY > 0

static void save_command_ps_at_cur_history(void)
{
    if (command_ps[0] != BB_NUL) {
        int cur = state->cur_history;
        free(state->history[cur]);

# if ENABLE_UNICODE_SUPPORT
        {
            char tbuf[MAX_LINELEN];
            save_string(tbuf, sizeof(tbuf));
            state->history[cur] = xstrdup(tbuf);
        }
# else
        state->history[cur] = xstrdup(command_ps);
# endif
    }
}

/* state->flags is already checked to be nonzero */
static int get_previous_history(void)
{
    if ((state->flags & DO_HISTORY) && state->cur_history) {
        save_command_ps_at_cur_history();
        state->cur_history--;
        return 1;
    }
    beep();
    return 0;
}

static int get_next_history(void)
{
    if (state->flags & DO_HISTORY) {
        if (state->cur_history < state->cnt_history) {
            save_command_ps_at_cur_history(); /* save the current history line */
            return ++state->cur_history;
        }
    }
    beep();
    return 0;
}

# if ENABLE_FEATURE_EDITING_SAVEHISTORY
/* We try to ensure that concurrent additions to the history
 * do not overwrite each other.
 * Otherwise shell users get unhappy.
 *
 * History file is trimmed lazily, when it grows several times longer
 * than configured MAX_HISTORY lines.
 */

static void free_line_input_t(line_input_t *n)
{
    int i = n->cnt_history;
    while (i > 0)
        free(n->history[--i]);
    free(n);
}

/* state->flags is already checked to be nonzero */
static void load_history(line_input_t *st_parm)
{
    char *temp_h[MAX_HISTORY];
    char *line;
    FILE *fp;
    unsigned idx, i, line_len;

    /* NB: do not trash old history if file can't be opened */

    fp = fopen_for_read(st_parm->hist_file);
    if (fp) {
        /* clean up old history */
        for (idx = st_parm->cnt_history; idx > 0;) {
            idx--;
            free(st_parm->history[idx]);
            st_parm->history[idx] = NULL;
        }

        /* fill temp_h[], retaining only last MAX_HISTORY lines */
        memset(temp_h, 0, sizeof(temp_h));
        st_parm->cnt_history_in_file = idx = 0;
        while ((line = xmalloc_fgetline(fp)) != NULL) {
            if (line[0] == '\0') {
                free(line);
                continue;
            }
            free(temp_h[idx]);
            temp_h[idx] = line;
            st_parm->cnt_history_in_file++;
            idx++;
            if (idx == MAX_HISTORY)
                idx = 0;
        }
        fclose(fp);

        /* find first non-NULL temp_h[], if any */
        if (st_parm->cnt_history_in_file) {
            while (temp_h[idx] == NULL) {
                idx++;
                if (idx == MAX_HISTORY)
                    idx = 0;
            }
        }

        /* copy temp_h[] to st_parm->history[] */
        for (i = 0; i < MAX_HISTORY;) {
            line = temp_h[idx];
            if (!line)
                break;
            idx++;
            if (idx == MAX_HISTORY)
                idx = 0;
            line_len = strlen(line);
            if (line_len >= MAX_LINELEN)
                line[MAX_LINELEN-1] = '\0';
            st_parm->history[i++] = line;
        }
        st_parm->cnt_history = i;
    }
}

/* state->flags is already checked to be nonzero */
static void save_history(char *str)
{
    int fd;
    int len, len2;

    fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0600);
    if (fd < 0)
        return;
    xlseek(fd, 0, SEEK_END); /* paranoia */
    len = strlen(str);
    str[len] = '\n'; /* we (try to) do atomic write */
    len2 = full_write(fd, str, len + 1);
    str[len] = '\0';
    close(fd);
    if (len2 != len + 1)
        return; /* "wtf?" */

    /* did we write so much that history file needs trimming? */
    state->cnt_history_in_file++;
    if (state->cnt_history_in_file > MAX_HISTORY * 4) {
        char *new_name;
        line_input_t *st_temp;

        /* we may have concurrently written entries from others.
         * load them */
        st_temp = new_line_input_t(state->flags);
        st_temp->hist_file = state->hist_file;
        load_history(st_temp);

        /* write out temp file and replace hist_file atomically */
        new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
        fd = open(state->hist_file, O_WRONLY | O_CREAT | O_TRUNC, 0600);
        if (fd >= 0) {
            FILE *fp;
            int i;

            fp = xfdopen_for_write(fd);
            for (i = 0; i < st_temp->cnt_history; i++)
                fprintf(fp, "%s\n", st_temp->history[i]);
            fclose(fp);
            if (rename(new_name, state->hist_file) == 0)
                state->cnt_history_in_file = st_temp->cnt_history;
        }
        free(new_name);
        free_line_input_t(st_temp);
    }
}
# else
#  define load_history(a) ((void)0)
#  define save_history(a) ((void)0)
# endif /* FEATURE_COMMAND_SAVEHISTORY */

static void remember_in_history(char *str)
{
    int i;

    if (!(state->flags & DO_HISTORY))
        return;
    if (str[0] == '\0')
        return;
    i = state->cnt_history;
    /* Don't save dupes */
    if (i && strcmp(state->history[i-1], str) == 0)
        return;

    free(state->history[MAX_HISTORY]); /* redundant, paranoia */
    state->history[MAX_HISTORY] = NULL; /* redundant, paranoia */

    /* If history[] is full, remove the oldest command */
    /* we need to keep history[MAX_HISTORY] empty, hence >=, not > */
    if (i >= MAX_HISTORY) {
        free(state->history[0]);
        for (i = 0; i < MAX_HISTORY-1; i++)
            state->history[i] = state->history[i+1];
        /* i == MAX_HISTORY-1 */
    }
    /* i <= MAX_HISTORY-1 */
    state->history[i++] = xstrdup(str);
    /* i <= MAX_HISTORY */
    state->cur_history = i;
    state->cnt_history = i;
# if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
    if ((state->flags & SAVE_HISTORY) && state->hist_file)
        save_history(str);
# endif
    IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
}

#else /* MAX_HISTORY == 0 */
# define remember_in_history(a) ((void)0)
#endif /* MAX_HISTORY */


#if ENABLE_FEATURE_EDITING_VI
/*
 * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
 */
static void
vi_Word_motion(int eat)
{
    CHAR_T *command = command_ps;

    while (cursor < command_len && !BB_isspace(command[cursor]))
        input_forward();
    if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
        input_forward();
}

static void
vi_word_motion(int eat)
{
    CHAR_T *command = command_ps;

    if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
        while (cursor < command_len
         && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
        ) {
            input_forward();
        }
    } else if (BB_ispunct(command[cursor])) {
        while (cursor < command_len && BB_ispunct(command[cursor+1]))
            input_forward();
    }

    if (cursor < command_len)
        input_forward();

    if (eat) {
        while (cursor < command_len && BB_isspace(command[cursor]))
            input_forward();
    }
}

static void
vi_End_motion(void)
{
    CHAR_T *command = command_ps;

    input_forward();
    while (cursor < command_len && BB_isspace(command[cursor]))
        input_forward();
    while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
        input_forward();
}

static void
vi_end_motion(void)
{
    CHAR_T *command = command_ps;

    if (cursor >= command_len-1)
        return;
    input_forward();
    while (cursor < command_len-1 && BB_isspace(command[cursor]))
        input_forward();
    if (cursor >= command_len-1)
        return;
    if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
        while (cursor < command_len-1
         && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
        ) {
            input_forward();
        }
    } else if (BB_ispunct(command[cursor])) {
        while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
            input_forward();
    }
}

static void
vi_Back_motion(void)
{
    CHAR_T *command = command_ps;

    while (cursor > 0 && BB_isspace(command[cursor-1]))
        input_backward(1);
    while (cursor > 0 && !BB_isspace(command[cursor-1]))
        input_backward(1);
}

static void
vi_back_motion(void)
{
    CHAR_T *command = command_ps;

    if (cursor <= 0)
        return;
    input_backward(1);
    while (cursor > 0 && BB_isspace(command[cursor]))
        input_backward(1);
    if (cursor <= 0)
        return;
    if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
        while (cursor > 0
         && (BB_isalnum(command[cursor-1]) || command[cursor-1] == '_')
        ) {
            input_backward(1);
        }
    } else if (BB_ispunct(command[cursor])) {
        while (cursor > 0 && BB_ispunct(command[cursor-1]))
            input_backward(1);
    }
}
#endif

/* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
static void ctrl_left(void)
{
    CHAR_T *command = command_ps;

    while (1) {
        CHAR_T c;

        input_backward(1);
        if (cursor == 0)
            break;
        c = command[cursor];
        if (c != ' ' && !BB_ispunct(c)) {
            /* we reached a "word" delimited by spaces/punct.
             * go to its beginning */
            while (1) {
                c = command[cursor - 1];
                if (c == ' ' || BB_ispunct(c))
                    break;
                input_backward(1);
                if (cursor == 0)
                    break;
            }
            break;
        }
    }
}
static void ctrl_right(void)
{
    CHAR_T *command = command_ps;

    while (1) {
        CHAR_T c;

        c = command[cursor];
        if (c == BB_NUL)
            break;
        if (c != ' ' && !BB_ispunct(c)) {
            /* we reached a "word" delimited by spaces/punct.
             * go to its end + 1 */
            while (1) {
                input_forward();
                c = command[cursor];
                if (c == BB_NUL || c == ' ' || BB_ispunct(c))
                    break;
            }
            break;
        }
        input_forward();
    }
}


/*
 * read_line_input and its helpers
 */

#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
static void ask_terminal(void)
{
    /* Ask terminal where is the cursor now.
     * lineedit_read_key handles response and corrects
     * our idea of current cursor position.
     * Testcase: run "echo -n long_line_long_line_long_line",
     * then type in a long, wrapping command and try to
     * delete it using backspace key.
     * Note: we print it _after_ prompt, because
     * prompt may contain CR. Example: PS1='\[\r\n\]\w '
     */
    /* Problem: if there is buffered input on stdin,
     * the response will be delivered later,
     * possibly to an unsuspecting application.
     * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
     * Result:
     * ~/srcdevel/bbox/fix/busybox.t4 #
     * ~/srcdevel/bbox/fix/busybox.t4 #
     * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 #  <-- garbage
     * ~/srcdevel/bbox/fix/busybox.t4 #
     *
     * Checking for input with poll only makes the race narrower,
     * I still can trigger it. Strace:
     *
     * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
     * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout)  <-- no input exists
     * write(1, "\33[6n", 4) = 4  <-- send the ESC sequence, quick!
     * poll([{fd=0, events=POLLIN}], 1, 4294967295) = 1 ([{fd=0, revents=POLLIN}])
     * read(0, "\n", 1)      = 1  <-- oh crap, user's input got in first
     */
    struct pollfd pfd;

    pfd.fd = STDIN_FILENO;
    pfd.events = POLLIN;
    if (safe_poll(&pfd, 1, 0) == 0) {
        S.sent_ESC_br6n = 1;
        fputs(ESC"[6n", stdout);
        fflush_all(); /* make terminal see it ASAP! */
    }
}
#else
#define ask_terminal() ((void)0)
#endif

#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
static void parse_and_put_prompt(const char *prmt_ptr)
{
    cmdedit_prompt = prmt_ptr;
    cmdedit_prmt_len = strlen(prmt_ptr);
    put_prompt();
}
#else
static void parse_and_put_prompt(const char *prmt_ptr)
{
    int prmt_len = 0;
    size_t cur_prmt_len = 0;
    char flg_not_length = '[';
    char *prmt_mem_ptr = xzalloc(1);
    char *cwd_buf = xrealloc_getcwd_or_warn(NULL);
    char cbuf[2];
    char c;
    char *pbuf;

    cmdedit_prmt_len = 0;

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

    cbuf[1] = '\0'; /* never changes */

    while (*prmt_ptr) {
        char *free_me = NULL;

        pbuf = cbuf;
        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) {
# if ENABLE_USERNAME_OR_HOMEDIR
                case 'u':
                    pbuf = user_buf ? user_buf : (char*)"";
                    break;
# endif
                case 'h':
                    pbuf = free_me = safe_gethostname();
                    *strchrnul(pbuf, '.') = '\0';
                    break;
                case '$':
                    c = (geteuid() == 0 ? '#' : '$');
                    break;
# if ENABLE_USERNAME_OR_HOMEDIR
                case 'w':
                    /* /home/user[/something] -> ~[/something] */
                    pbuf = cwd_buf;
                    l = strlen(home_pwd_buf);
                    if (l != 0
                     && strncmp(home_pwd_buf, cwd_buf, l) == 0
                     && (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
                     && strlen(cwd_buf + l) < PATH_MAX
                    ) {
                        pbuf = free_me = xasprintf("~%s", cwd_buf + l);
                    }
                    break;
# endif
                case 'W':
                    pbuf = cwd_buf;
                    cp = strrchr(pbuf, '/');
                    if (cp != NULL && cp != pbuf)
                        pbuf += (cp-pbuf) + 1;
                    break;
                case '!':
                    pbuf = free_me = xasprintf("%d", num_ok_lines);
                    break;
                case 'e': case 'E':     /* \e \E = \033 */
                    c = '\033';
                    break;
                case 'x': case 'X': {
                    char buf2[4];
                    for (l = 0; l < 3;) {
                        unsigned h;
                        buf2[l++] = *prmt_ptr;
                        buf2[l] = '\0';
                        h = strtoul(buf2, &pbuf, 16);
                        if (h > UCHAR_MAX || (pbuf - buf2) < l) {
                            buf2[--l] = '\0';
                            break;
                        }
                        prmt_ptr++;
                    }
                    c = (char)strtoul(buf2, NULL, 16);
                    if (c == 0)
                        c = '?';
                    pbuf = cbuf;
                    break;
                }
                case '[': case ']':
                    if (c == flg_not_length) {
                        flg_not_length = (flg_not_length == '[' ? ']' : '[');
                        continue;
                    }
                    break;
                } /* switch */
            } /* if */
        } /* if */
        cbuf[0] = c;
        cur_prmt_len = strlen(pbuf);
        prmt_len += cur_prmt_len;
        if (flg_not_length != ']')
            cmdedit_prmt_len += cur_prmt_len;
        prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
        free(free_me);
    } /* while */

    if (cwd_buf != (char *)bb_msg_unknown)
        free(cwd_buf);
    cmdedit_prompt = prmt_mem_ptr;
    put_prompt();
}
#endif

static void cmdedit_setwidth(unsigned w, int redraw_flg)
{
    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), command_len - cursor);
        fflush_all();
    }
}

static void win_changed(int nsig)
{
    int sv_errno = errno;
    unsigned width;
    get_terminal_width_height(0, &width, NULL);
    cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
    if (nsig == SIGWINCH)
        signal(SIGWINCH, win_changed); /* rearm ourself */
    errno = sv_errno;
}

static int lineedit_read_key(char *read_key_buffer)
{
    int64_t ic;
    int timeout = -1;
#if ENABLE_UNICODE_SUPPORT
    char unicode_buf[MB_CUR_MAX + 1];
    int unicode_idx = 0;
#endif

    while (1) {
        /* Wait for input. TIMEOUT = -1 makes read_key wait even
         * on nonblocking stdin, TIMEOUT = 50 makes sure we won't
         * insist on full MB_CUR_MAX buffer to declare input like
         * "\xff\n",pause,"ls\n" invalid and thus won't lose "ls".
         *
         * Note: read_key sets errno to 0 on success.
         */
        ic = read_key(STDIN_FILENO, read_key_buffer, timeout);
        if (errno) {
#if ENABLE_UNICODE_SUPPORT
            if (errno == EAGAIN && unicode_idx != 0)
                goto pushback;
#endif
            break;
        }

#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
        if ((int32_t)ic == KEYCODE_CURSOR_POS
         && S.sent_ESC_br6n
        ) {
            S.sent_ESC_br6n = 0;
            if (cursor == 0) { /* otherwise it may be bogus */
                int col = ((ic >> 32) & 0x7fff) - 1;
                if (col > cmdedit_prmt_len) {
                    cmdedit_x += (col - cmdedit_prmt_len);
                    while (cmdedit_x >= cmdedit_termw) {
                        cmdedit_x -= cmdedit_termw;
                        cmdedit_y++;
                    }
                }
            }
            continue;
        }
#endif

#if ENABLE_UNICODE_SUPPORT
        if (unicode_status == UNICODE_ON) {
            wchar_t wc;

            if ((int32_t)ic < 0) /* KEYCODE_xxx */
                break;
            // TODO: imagine sequence like: 0xff,<left-arrow>: we are currently losing 0xff...

            unicode_buf[unicode_idx++] = ic;
            unicode_buf[unicode_idx] = '\0';
            if (mbstowcs(&wc, unicode_buf, 1) != 1) {
                /* Not (yet?) a valid unicode char */
                if (unicode_idx < MB_CUR_MAX) {
                    timeout = 50;
                    continue;
                }
 pushback:
                /* Invalid sequence. Save all "bad bytes" except first */
                read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1);
# if !ENABLE_UNICODE_PRESERVE_BROKEN
                ic = CONFIG_SUBST_WCHAR;
# else
                ic = unicode_mark_raw_byte(unicode_buf[0]);
# endif
            } else {
                /* Valid unicode char, return its code */
                ic = wc;
            }
        }
#endif
        break;
    }

    return ic;
}

#if ENABLE_UNICODE_BIDI_SUPPORT
static int isrtl_str(void)
{
    int idx = cursor;

    while (idx < command_len && unicode_bidi_is_neutral_wchar(command_ps[idx]))
        idx++;
    return unicode_bidi_isrtl(command_ps[idx]);
}
#else
# define isrtl_str() 0
#endif

/* leave out the "vi-mode"-only case labels if vi editing isn't
 * configured. */
#define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)

/* convert uppercase ascii to equivalent control char, for readability */
#undef CTRL
#define CTRL(a) ((a) & ~0x40)

/* maxsize must be >= 2.
 * Returns:
 * -1 on read errors or EOF, or on bare Ctrl-D,
 * 0  on ctrl-C (the line entered is still returned in 'command'),
 * >0 length of input string, including terminating '\n'
 */
int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, line_input_t *st)
{
    int len;
#if ENABLE_FEATURE_TAB_COMPLETION
    smallint lastWasTab = 0;
#endif
    smallint break_out = 0;
#if ENABLE_FEATURE_EDITING_VI
    smallint vi_cmdmode = 0;
#endif
    struct termios initial_settings;
    struct termios new_settings;
    char read_key_buffer[KEYCODE_BUFFER_SIZE];

    INIT_S();

    if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
     || !(initial_settings.c_lflag & ECHO)
    ) {
        /* Happens when e.g. stty -echo was run before */
        parse_and_put_prompt(prompt);
        /* fflush_all(); - done by parse_and_put_prompt */
        if (fgets(command, maxsize, stdin) == NULL)
            len = -1; /* EOF or error */
        else
            len = strlen(command);
        DEINIT_S();
        return len;
    }

    init_unicode();

// FIXME: audit & improve this
    if (maxsize > MAX_LINELEN)
        maxsize = MAX_LINELEN;
    S.maxsize = maxsize;

    /* With null flags, no other fields are ever used */
    state = st ? st : (line_input_t*) &const_int_0;
#if MAX_HISTORY > 0
# if ENABLE_FEATURE_EDITING_SAVEHISTORY
    if ((state->flags & SAVE_HISTORY) && state->hist_file)
        if (state->cnt_history == 0)
            load_history(state);
# endif
    if (state->flags & DO_HISTORY)
        state->cur_history = state->cnt_history;
#endif

    /* prepare before init handlers */
    cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
    command_len = 0;
#if ENABLE_UNICODE_SUPPORT
    command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
#else
    command_ps = command;
    command[0] = '\0';
#endif
#define command command_must_not_be_used

    new_settings = initial_settings;
    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[] is not parsed if ICANON is off */
    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;
    tcsetattr_stdin_TCSANOW(&new_settings);

    /* Now initialize things */
    previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
    win_changed(0); /* do initial resizing */
#if ENABLE_USERNAME_OR_HOMEDIR
    {
        struct passwd *entry;

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

#if 0
    for (i = 0; i <= MAX_HISTORY; i++)
        bb_error_msg("history[%d]:'%s'", i, state->history[i]);
    bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
#endif

    /* Print out the command prompt, optionally ask where cursor is */
    parse_and_put_prompt(prompt);
    ask_terminal();

    read_key_buffer[0] = 0;
    while (1) {
        /*
         * The emacs and vi modes share much of the code in the big
         * command loop.  Commands entered when in vi's command mode
         * (aka "escape mode") get an extra bit added to distinguish
         * them - this keeps them from being self-inserted. This
         * clutters the big switch a bit, but keeps all the code
         * in one place.
         */
        enum {
            VI_CMDMODE_BIT = 0x40000000,
            /* 0x80000000 bit flags KEYCODE_xxx */
        };
        int32_t ic, ic_raw;

        fflush_all();
        ic = ic_raw = lineedit_read_key(read_key_buffer);

#if ENABLE_FEATURE_EDITING_VI
        newdelflag = 1;
        if (vi_cmdmode) {
            /* btw, since KEYCODE_xxx are all < 0, this doesn't
             * change ic if it contains one of them: */
            ic |= VI_CMDMODE_BIT;
        }
#endif

        switch (ic) {
        case '\n':
        case '\r':
        vi_case('\n'|VI_CMDMODE_BIT:)
        vi_case('\r'|VI_CMDMODE_BIT:)
            /* Enter */
            goto_new_line();
            break_out = 1;
            break;
        case CTRL('A'):
        vi_case('0'|VI_CMDMODE_BIT:)
            /* Control-a -- Beginning of line */
            input_backward(cursor);
            break;
        case CTRL('B'):
        vi_case('h'|VI_CMDMODE_BIT:)
        vi_case('\b'|VI_CMDMODE_BIT:) /* ^H */
        vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
            input_backward(1); /* Move back one character */
            break;
        case CTRL('E'):
        vi_case('$'|VI_CMDMODE_BIT:)
            /* Control-e -- End of line */
            put_till_end_and_adv_cursor();
            break;
        case CTRL('F'):
        vi_case('l'|VI_CMDMODE_BIT:)
        vi_case(' '|VI_CMDMODE_BIT:)
            input_forward(); /* Move forward one character */
            break;
        case '\b':   /* ^H */
        case '\x7f': /* DEL */
            if (!isrtl_str())
                input_backspace();
            else
                input_delete(0);
            break;
        case KEYCODE_DELETE:
            if (!isrtl_str())
                input_delete(0);
            else
                input_backspace();
            break;
#if ENABLE_FEATURE_TAB_COMPLETION
        case '\t':
            input_tab(&lastWasTab);
            break;
#endif
        case CTRL('K'):
            /* Control-k -- clear to end of line */
            command_ps[cursor] = BB_NUL;
            command_len = cursor;
            printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
            break;
        case CTRL('L'):
        vi_case(CTRL('L')|VI_CMDMODE_BIT:)
            /* Control-l -- clear screen */
            printf(ESC"[H"); /* cursor to top,left */
            redraw(0, command_len - cursor);
            break;
#if MAX_HISTORY > 0
        case CTRL('N'):
        vi_case(CTRL('N')|VI_CMDMODE_BIT:)
        vi_case('j'|VI_CMDMODE_BIT:)
            /* Control-n -- Get next command in history */
            if (get_next_history())
                goto rewrite_line;
            break;
        case CTRL('P'):
        vi_case(CTRL('P')|VI_CMDMODE_BIT:)
        vi_case('k'|VI_CMDMODE_BIT:)
            /* Control-p -- Get previous command from history */
            if (get_previous_history())
                goto rewrite_line;
            break;
#endif
        case CTRL('U'):
        vi_case(CTRL('U')|VI_CMDMODE_BIT:)
            /* Control-U -- Clear line before cursor */
            if (cursor) {
                command_len -= cursor;
                memmove(command_ps, command_ps + cursor,
                    (command_len + 1) * sizeof(command_ps[0]));
                redraw(cmdedit_y, command_len);
            }
            break;
        case CTRL('W'):
        vi_case(CTRL('W')|VI_CMDMODE_BIT:)
            /* Control-W -- Remove the last word */
            while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
                input_backspace();
            while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
                input_backspace();
            break;

#if ENABLE_FEATURE_EDITING_VI
        case 'i'|VI_CMDMODE_BIT:
            vi_cmdmode = 0;
            break;
        case 'I'|VI_CMDMODE_BIT:
            input_backward(cursor);
            vi_cmdmode = 0;
            break;
        case 'a'|VI_CMDMODE_BIT:
            input_forward();
            vi_cmdmode = 0;
            break;
        case 'A'|VI_CMDMODE_BIT:
            put_till_end_and_adv_cursor();
            vi_cmdmode = 0;
            break;
        case 'x'|VI_CMDMODE_BIT:
            input_delete(1);
            break;
        case 'X'|VI_CMDMODE_BIT:
            if (cursor > 0) {
                input_backward(1);
                input_delete(1);
            }
            break;
        case 'W'|VI_CMDMODE_BIT:
            vi_Word_motion(1);
            break;
        case 'w'|VI_CMDMODE_BIT:
            vi_word_motion(1);
            break;
        case 'E'|VI_CMDMODE_BIT:
            vi_End_motion();
            break;
        case 'e'|VI_CMDMODE_BIT:
            vi_end_motion();
            break;
        case 'B'|VI_CMDMODE_BIT:
            vi_Back_motion();
            break;
        case 'b'|VI_CMDMODE_BIT:
            vi_back_motion();
            break;
        case 'C'|VI_CMDMODE_BIT:
            vi_cmdmode = 0;
            /* fall through */
        case 'D'|VI_CMDMODE_BIT:
            goto clear_to_eol;

        case 'c'|VI_CMDMODE_BIT:
            vi_cmdmode = 0;
            /* fall through */
        case 'd'|VI_CMDMODE_BIT: {
            int nc, sc;

            ic = lineedit_read_key(read_key_buffer);
            if (errno) /* error */
                goto return_error_indicator;
            if (ic == ic_raw) { /* "cc", "dd" */
                input_backward(cursor);
                goto clear_to_eol;
                break;
            }

            sc = cursor;
            switch (ic) {
            case 'w':
            case 'W':
            case 'e':
            case 'E':
                switch (ic) {
                case 'w':   /* "dw", "cw" */
                    vi_word_motion(vi_cmdmode);
                    break;
                case 'W':   /* 'dW', 'cW' */
                    vi_Word_motion(vi_cmdmode);
                    break;
                case 'e':   /* 'de', 'ce' */
                    vi_end_motion();
                    input_forward();
                    break;
                case 'E':   /* 'dE', 'cE' */
                    vi_End_motion();
                    input_forward();
                    break;
                }
                nc = cursor;
                input_backward(cursor - sc);
                while (nc-- > cursor)
                    input_delete(1);
                break;
            case 'b':  /* "db", "cb" */
            case 'B':  /* implemented as B */
                if (ic == 'b')
                    vi_back_motion();
                else
                    vi_Back_motion();
                while (sc-- > cursor)
                    input_delete(1);
                break;
            case ' ':  /* "d ", "c " */
                input_delete(1);
                break;
            case '$':  /* "d$", "c$" */
 clear_to_eol:
                while (cursor < command_len)
                    input_delete(1);
                break;
            }
            break;
        }
        case 'p'|VI_CMDMODE_BIT:
            input_forward();
            /* fallthrough */
        case 'P'|VI_CMDMODE_BIT:
            put();
            break;
        case 'r'|VI_CMDMODE_BIT:
//FIXME: unicode case?
            ic = lineedit_read_key(read_key_buffer);
            if (errno) /* error */
                goto return_error_indicator;
            if (ic < ' ' || ic > 255) {
                beep();
            } else {
                command_ps[cursor] = ic;
                bb_putchar(ic);
                bb_putchar('\b');
            }
            break;
        case '\x1b': /* ESC */
            if (state->flags & VI_MODE) {
                /* insert mode --> command mode */
                vi_cmdmode = 1;
                input_backward(1);
            }
            break;
#endif /* FEATURE_COMMAND_EDITING_VI */

#if MAX_HISTORY > 0
        case KEYCODE_UP:
            if (get_previous_history())
                goto rewrite_line;
            beep();
            break;
        case KEYCODE_DOWN:
            if (!get_next_history())
                break;
 rewrite_line:
            /* Rewrite the line with the selected history item */
            /* change command */
            command_len = load_string(state->history[state->cur_history] ?
                    state->history[state->cur_history] : "", maxsize);
            /* redraw and go to eol (bol, in vi) */
            redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
            break;
#endif
        case KEYCODE_RIGHT:
            input_forward();
            break;
        case KEYCODE_LEFT:
            input_backward(1);
            break;
        case KEYCODE_CTRL_LEFT:
            ctrl_left();
            break;
        case KEYCODE_CTRL_RIGHT:
            ctrl_right();
            break;
        case KEYCODE_HOME:
            input_backward(cursor);
            break;
        case KEYCODE_END:
            put_till_end_and_adv_cursor();
            break;

        default:
            if (initial_settings.c_cc[VINTR] != 0
             && ic_raw == initial_settings.c_cc[VINTR]
            ) {
                /* Ctrl-C (usually) - stop gathering input */
                goto_new_line();
                command_len = 0;
                break_out = -1; /* "do not append '\n'" */
                break;
            }
            if (initial_settings.c_cc[VEOF] != 0
             && ic_raw == initial_settings.c_cc[VEOF]
            ) {
                /* Ctrl-D (usually) - delete one character,
                 * or exit if len=0 and no chars to delete */
                if (command_len == 0) {
                    errno = 0;

        case -1: /* error (e.g. EIO when tty is destroyed) */
 IF_FEATURE_EDITING_VI(return_error_indicator:)
                    break_out = command_len = -1;
                    break;
                }
                input_delete(0);
                break;
            }
//          /* Control-V -- force insert of next char */
//          if (c == CTRL('V')) {
//              if (safe_read(STDIN_FILENO, &c, 1) < 1)
//                  goto return_error_indicator;
//              if (c == 0) {
//                  beep();
//                  break;
//              }
//          }
            if (ic < ' '
             || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
             || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
            ) {
                /* If VI_CMDMODE_BIT is set, ic is >= 256
                 * and vi mode ignores unexpected chars.
                 * Otherwise, we are here if ic is a
                 * control char or an unhandled ESC sequence,
                 * which is also ignored.
                 */
                break;
            }
            if ((int)command_len >= (maxsize - 2)) {
                /* Not enough space for the char and EOL */
                break;
            }

            command_len++;
            if (cursor == (command_len - 1)) {
                /* We are at the end, append */
                command_ps[cursor] = ic;
                command_ps[cursor + 1] = BB_NUL;
                put_cur_glyph_and_inc_cursor();
                if (unicode_bidi_isrtl(ic))
                    input_backward(1);
            } else {
                /* In the middle, insert */
                int sc = cursor;

                memmove(command_ps + sc + 1, command_ps + sc,
                    (command_len - sc) * sizeof(command_ps[0]));
                command_ps[sc] = ic;
                /* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
                if (!isrtl_str())
                    sc++; /* no */
                put_till_end_and_adv_cursor();
                /* to prev x pos + 1 */
                input_backward(cursor - sc);
            }
            break;
        } /* switch (ic) */

        if (break_out)
            break;

#if ENABLE_FEATURE_TAB_COMPLETION
        if (ic_raw != '\t')
            lastWasTab = 0;
#endif
    } /* while (1) */

#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
    if (S.sent_ESC_br6n) {
        /* "sleep 1; busybox ash" + hold [Enter] to trigger.
         * We sent "ESC [ 6 n", but got '\n' first, and
         * KEYCODE_CURSOR_POS response is now buffered from terminal.
         * It's bad already and not much can be done with it
         * (it _will_ be visible for the next process to read stdin),
         * but without this delay it even shows up on the screen
         * as garbage because we restore echo settings with tcsetattr
         * before it comes in. UGLY!
         */
        usleep(20*1000);
    }
#endif

/* End of bug-catching "command_must_not_be_used" trick */
#undef command

#if ENABLE_UNICODE_SUPPORT
    command[0] = '\0';
    if (command_len > 0)
        command_len = save_string(command, maxsize - 1);
    free(command_ps);
#endif

    if (command_len > 0)
        remember_in_history(command);

    if (break_out > 0) {
        command[command_len++] = '\n';
        command[command_len] = '\0';
    }

#if ENABLE_FEATURE_TAB_COMPLETION
    free_tab_completion_data();
#endif

    /* restore initial_settings */
    tcsetattr_stdin_TCSANOW(&initial_settings);
    /* restore SIGWINCH handler */
    signal(SIGWINCH, previous_SIGWINCH_handler);
    fflush_all();

    len = command_len;
    DEINIT_S();

    return len; /* can't return command_len, DEINIT_S() destroys it */
}

#else  /* !FEATURE_EDITING */

#undef read_line_input
int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
{
    fputs(prompt, stdout);
    fflush_all();
    fgets(command, maxsize, stdin);
    return strlen(command);
}

#endif  /* !FEATURE_EDITING */


/*
 * Testing
 */

#ifdef TEST

#include <locale.h>

const char *applet_name = "debug stuff usage";

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

    while (1) {
        int l;
        l = read_line_input(prompt, buff);
        if (l <= 0 || buff[l-1] != '\n')
            break;
        buff[l-1] = '\0';
        printf("*** read_line_input() returned line =%s=\n", buff);
    }
    printf("*** read_line_input() detect ^D\n");
    return 0;
}

#endif  /* TEST */