libtommath: Fix possible integer overflow CVE-2023-36328

[heimdal.git] / lib / libedit / src / terminal.c

/*      $NetBSD: terminal.c,v 1.32 2016/05/09 21:46:56 christos Exp $   */

/*-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Christos Zoulas of Cornell University.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "config.h"
#if !defined(lint) && !defined(SCCSID)
#if 0
static char sccsid[] = "@(#)term.c      8.2 (Berkeley) 4/30/95";
#else
__RCSID("$NetBSD: terminal.c,v 1.32 2016/05/09 21:46:56 christos Exp $");
#endif
#endif /* not lint && not SCCSID */

/*
 * terminal.c: Editor/termcap-curses interface
 *             We have to declare a static variable here, since the
 *             termcap putchar routine does not take an argument!
 */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef HAVE_TERMCAP_H
#include <termcap.h>
#endif
#ifdef HAVE_CURSES_H
#include <curses.h>
#elif HAVE_NCURSES_H
#include <ncurses.h>
#endif

/* Solaris's term.h does horrid things. */
#if defined(HAVE_TERM_H) && !defined(__sun) && !defined(HAVE_TERMCAP_H)
#include <term.h>
#endif

#ifdef _REENTRANT
#include <pthread.h>
#endif

#include "el.h"
#include "fcns.h"

/*
 * IMPORTANT NOTE: these routines are allowed to look at the current screen
 * and the current position assuming that it is correct.  If this is not
 * true, then the update will be WRONG!  This is (should be) a valid
 * assumption...
 */

#define TC_BUFSIZE      ((size_t)2048)

#define GoodStr(a)      (el->el_terminal.t_str[a] != NULL && \
                            el->el_terminal.t_str[a][0] != '\0')
#define Str(a)          el->el_terminal.t_str[a]
#define Val(a)          el->el_terminal.t_val[a]

static const struct termcapstr {
        const char *name;
        const char *long_name;
} tstr[] = {
#define T_al    0
        { "al", "add new blank line" },
#define T_bl    1
        { "bl", "audible bell" },
#define T_cd    2
        { "cd", "clear to bottom" },
#define T_ce    3
        { "ce", "clear to end of line" },
#define T_ch    4
        { "ch", "cursor to horiz pos" },
#define T_cl    5
        { "cl", "clear screen" },
#define T_dc    6
        { "dc", "delete a character" },
#define T_dl    7
        { "dl", "delete a line" },
#define T_dm    8
        { "dm", "start delete mode" },
#define T_ed    9
        { "ed", "end delete mode" },
#define T_ei    10
        { "ei", "end insert mode" },
#define T_fs    11
        { "fs", "cursor from status line" },
#define T_ho    12
        { "ho", "home cursor" },
#define T_ic    13
        { "ic", "insert character" },
#define T_im    14
        { "im", "start insert mode" },
#define T_ip    15
        { "ip", "insert padding" },
#define T_kd    16
        { "kd", "sends cursor down" },
#define T_kl    17
        { "kl", "sends cursor left" },
#define T_kr    18
        { "kr", "sends cursor right" },
#define T_ku    19
        { "ku", "sends cursor up" },
#define T_md    20
        { "md", "begin bold" },
#define T_me    21
        { "me", "end attributes" },
#define T_nd    22
        { "nd", "non destructive space" },
#define T_se    23
        { "se", "end standout" },
#define T_so    24
        { "so", "begin standout" },
#define T_ts    25
        { "ts", "cursor to status line" },
#define T_up    26
        { "up", "cursor up one" },
#define T_us    27
        { "us", "begin underline" },
#define T_ue    28
        { "ue", "end underline" },
#define T_vb    29
        { "vb", "visible bell" },
#define T_DC    30
        { "DC", "delete multiple chars" },
#define T_DO    31
        { "DO", "cursor down multiple" },
#define T_IC    32
        { "IC", "insert multiple chars" },
#define T_LE    33
        { "LE", "cursor left multiple" },
#define T_RI    34
        { "RI", "cursor right multiple" },
#define T_UP    35
        { "UP", "cursor up multiple" },
#define T_kh    36
        { "kh", "send cursor home" },
#define T_at7   37
        { "@7", "send cursor end" },
#define T_kD    38
        { "kD", "send cursor delete" },
#define T_str   39
        { NULL, NULL }
};

static const struct termcapval {
        const char *name;
        const char *long_name;
} tval[] = {
#define T_am    0
        { "am", "has automatic margins" },
#define T_pt    1
        { "pt", "has physical tabs" },
#define T_li    2
        { "li", "Number of lines" },
#define T_co    3
        { "co", "Number of columns" },
#define T_km    4
        { "km", "Has meta key" },
#define T_xt    5
        { "xt", "Tab chars destructive" },
#define T_xn    6
        { "xn", "newline ignored at right margin" },
#define T_MT    7
        { "MT", "Has meta key" },                       /* XXX? */
#define T_val   8
        { NULL, NULL, }
};
/* do two or more of the attributes use me */

static void     terminal_setflags(EditLine *);
static int      terminal_rebuffer_display(EditLine *);
static void     terminal_free_display(EditLine *);
static int      terminal_alloc_display(EditLine *);
static void     terminal_alloc(EditLine *, const struct termcapstr *,
    const char *);
static void     terminal_init_arrow(EditLine *);
static void     terminal_reset_arrow(EditLine *);
static int      terminal_putc(int);
static void     terminal_tputs(EditLine *, const char *, int);

#ifdef _REENTRANT
static pthread_mutex_t terminal_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
static FILE *terminal_outfile = NULL;

#ifndef HAVE_TGETENT
/* provide a stub curses which fails all calls if we have no tgetent et al */
#define tgoto(x, y, z) (char *)0
#define tgetstr(x, y) (char *)0
#define tgetent(x, y) -1;
#define tputs(x, y, z) -1
#define tgetflag(x) -1
#define tgetnum(x) -1
#endif

/* terminal_setflags():
 *      Set the terminal capability flags
 */
static void
terminal_setflags(EditLine *el)
{
        EL_FLAGS = 0;
        if (el->el_tty.t_tabs)
                EL_FLAGS |= (Val(T_pt) && !Val(T_xt)) ? TERM_CAN_TAB : 0;

        EL_FLAGS |= (Val(T_km) || Val(T_MT)) ? TERM_HAS_META : 0;
        EL_FLAGS |= GoodStr(T_ce) ? TERM_CAN_CEOL : 0;
        EL_FLAGS |= (GoodStr(T_dc) || GoodStr(T_DC)) ? TERM_CAN_DELETE : 0;
        EL_FLAGS |= (GoodStr(T_im) || GoodStr(T_ic) || GoodStr(T_IC)) ?
            TERM_CAN_INSERT : 0;
        EL_FLAGS |= (GoodStr(T_up) || GoodStr(T_UP)) ? TERM_CAN_UP : 0;
        EL_FLAGS |= Val(T_am) ? TERM_HAS_AUTO_MARGINS : 0;
        EL_FLAGS |= Val(T_xn) ? TERM_HAS_MAGIC_MARGINS : 0;

        if (GoodStr(T_me) && GoodStr(T_ue))
                EL_FLAGS |= (strcmp(Str(T_me), Str(T_ue)) == 0) ?
                    TERM_CAN_ME : 0;
        else
                EL_FLAGS &= ~TERM_CAN_ME;
        if (GoodStr(T_me) && GoodStr(T_se))
                EL_FLAGS |= (strcmp(Str(T_me), Str(T_se)) == 0) ?
                    TERM_CAN_ME : 0;


#ifdef DEBUG_SCREEN
        if (!EL_CAN_UP) {
                (void) fprintf(el->el_errfile,
                    "WARNING: Your terminal cannot move up.\n");
                (void) fprintf(el->el_errfile,
                    "Editing may be odd for long lines.\n");
        }
        if (!EL_CAN_CEOL)
                (void) fprintf(el->el_errfile, "no clear EOL capability.\n");
        if (!EL_CAN_DELETE)
                (void) fprintf(el->el_errfile, "no delete char capability.\n");
        if (!EL_CAN_INSERT)
                (void) fprintf(el->el_errfile, "no insert char capability.\n");
#endif /* DEBUG_SCREEN */
}

/* terminal_init():
 *      Initialize the terminal stuff
 */
libedit_private int
terminal_init(EditLine *el)
{

        el->el_terminal.t_buf = el_malloc(TC_BUFSIZE *
            sizeof(*el->el_terminal.t_buf));
        if (el->el_terminal.t_buf == NULL)
                goto fail1;
        el->el_terminal.t_cap = el_malloc(TC_BUFSIZE *
            sizeof(*el->el_terminal.t_cap));
        if (el->el_terminal.t_cap == NULL)
                goto fail2;
        el->el_terminal.t_fkey = el_malloc(A_K_NKEYS *
            sizeof(*el->el_terminal.t_fkey));
        if (el->el_terminal.t_fkey == NULL)
                goto fail3;
        el->el_terminal.t_loc = 0;
        el->el_terminal.t_str = el_malloc(T_str *
            sizeof(*el->el_terminal.t_str));
        if (el->el_terminal.t_str == NULL)
                goto fail4;
        (void) memset(el->el_terminal.t_str, 0, T_str *
            sizeof(*el->el_terminal.t_str));
        el->el_terminal.t_val = el_malloc(T_val *
            sizeof(*el->el_terminal.t_val));
        if (el->el_terminal.t_val == NULL)
                goto fail5;
        (void) memset(el->el_terminal.t_val, 0, T_val *
            sizeof(*el->el_terminal.t_val));
        (void) terminal_set(el, NULL);
        terminal_init_arrow(el);
        return 0;
fail5:
        free(el->el_terminal.t_str);
        el->el_terminal.t_str = NULL;
fail4:
        free(el->el_terminal.t_fkey);
        el->el_terminal.t_fkey = NULL;
fail3:
        free(el->el_terminal.t_cap);
        el->el_terminal.t_cap = NULL;
fail2:
        free(el->el_terminal.t_buf);
        el->el_terminal.t_buf = NULL;
fail1:
        return -1;
}

/* terminal_end():
 *      Clean up the terminal stuff
 */
libedit_private void
terminal_end(EditLine *el)
{

        el_free(el->el_terminal.t_buf);
        el->el_terminal.t_buf = NULL;
        el_free(el->el_terminal.t_cap);
        el->el_terminal.t_cap = NULL;
        el->el_terminal.t_loc = 0;
        el_free(el->el_terminal.t_str);
        el->el_terminal.t_str = NULL;
        el_free(el->el_terminal.t_val);
        el->el_terminal.t_val = NULL;
        el_free(el->el_terminal.t_fkey);
        el->el_terminal.t_fkey = NULL;
        terminal_free_display(el);
}


/* terminal_alloc():
 *      Maintain a string pool for termcap strings
 */
static void
terminal_alloc(EditLine *el, const struct termcapstr *t, const char *cap)
{
        char termbuf[TC_BUFSIZE];
        size_t tlen, clen;
        char **tlist = el->el_terminal.t_str;
        char **tmp, **str = &tlist[t - tstr];

        (void) memset(termbuf, 0, sizeof(termbuf));
        if (cap == NULL || *cap == '\0') {
                *str = NULL;
                return;
        } else
                clen = strlen(cap);

        tlen = *str == NULL ? 0 : strlen(*str);

        /*
         * New string is shorter; no need to allocate space
         */
        if (clen <= tlen) {
                if (*str)
                        (void) strcpy(*str, cap);       /* XXX strcpy is safe */
                return;
        }
        /*
         * New string is longer; see if we have enough space to append
         */
        if (el->el_terminal.t_loc + 3 < TC_BUFSIZE) {
                                                /* XXX strcpy is safe */
                (void) strcpy(*str = &el->el_terminal.t_buf[
                    el->el_terminal.t_loc], cap);
                el->el_terminal.t_loc += clen + 1;      /* one for \0 */
                return;
        }
        /*
         * Compact our buffer; no need to check compaction, cause we know it
         * fits...
         */
        tlen = 0;
        for (tmp = tlist; tmp < &tlist[T_str]; tmp++)
                if (*tmp != NULL && **tmp != '\0' && *tmp != *str) {
                        char *ptr;

                        for (ptr = *tmp; *ptr != '\0'; termbuf[tlen++] = *ptr++)
                                continue;
                        termbuf[tlen++] = '\0';
                }
        memcpy(el->el_terminal.t_buf, termbuf, TC_BUFSIZE);
        el->el_terminal.t_loc = tlen;
        if (el->el_terminal.t_loc + 3 >= TC_BUFSIZE) {
                (void) fprintf(el->el_errfile,
                    "Out of termcap string space.\n");
                return;
        }
                                        /* XXX strcpy is safe */
        (void) strcpy(*str = &el->el_terminal.t_buf[el->el_terminal.t_loc],
            cap);
        el->el_terminal.t_loc += (size_t)clen + 1;      /* one for \0 */
        return;
}


/* terminal_rebuffer_display():
 *      Rebuffer the display after the screen changed size
 */
static int
terminal_rebuffer_display(EditLine *el)
{
        coord_t *c = &el->el_terminal.t_size;

        terminal_free_display(el);

        c->h = Val(T_co);
        c->v = Val(T_li);

        if (terminal_alloc_display(el) == -1)
                return -1;
        return 0;
}


/* terminal_alloc_display():
 *      Allocate a new display.
 */
static int
terminal_alloc_display(EditLine *el)
{
        int i;
        wchar_t **b;
        coord_t *c = &el->el_terminal.t_size;

        b =  el_malloc(sizeof(*b) * (size_t)(c->v + 1));
        if (b == NULL)
                goto done;
        for (i = 0; i < c->v; i++) {
                b[i] = el_malloc(sizeof(**b) * (size_t)(c->h + 1));
                if (b[i] == NULL) {
                        while (--i >= 0)
                                el_free(b[i]);
                        el_free(b);
                        goto done;
                }
        }
        b[c->v] = NULL;
        el->el_display = b;

        b = el_malloc(sizeof(*b) * (size_t)(c->v + 1));
        if (b == NULL)
                goto done;
        for (i = 0; i < c->v; i++) {
                b[i] = el_malloc(sizeof(**b) * (size_t)(c->h + 1));
                if (b[i] == NULL) {
                        while (--i >= 0)
                                el_free(b[i]);
                        el_free(b);
                        goto done;
                }
        }
        b[c->v] = NULL;
        el->el_vdisplay = b;
        return 0;
done:
        terminal_free_display(el);
        return -1;
}


/* terminal_free_display():
 *      Free the display buffers
 */
static void
terminal_free_display(EditLine *el)
{
        wchar_t **b;
        wchar_t **bufp;

        b = el->el_display;
        el->el_display = NULL;
        if (b != NULL) {
                for (bufp = b; *bufp != NULL; bufp++)
                        el_free(*bufp);
                el_free(b);
        }
        b = el->el_vdisplay;
        el->el_vdisplay = NULL;
        if (b != NULL) {
                for (bufp = b; *bufp != NULL; bufp++)
                        el_free(*bufp);
                el_free(b);
        }
}


/* terminal_move_to_line():
 *      move to line <where> (first line == 0)
 *      as efficiently as possible
 */
libedit_private void
terminal_move_to_line(EditLine *el, int where)
{
        int del;

        if (where == el->el_cursor.v)
                return;

        if (where > el->el_terminal.t_size.v) {
#ifdef DEBUG_SCREEN
                (void) fprintf(el->el_errfile,
                    "%s: where is ridiculous: %d\r\n", __func__, where);
#endif /* DEBUG_SCREEN */
                return;
        }
        if ((del = where - el->el_cursor.v) > 0) {
                while (del > 0) {
                        if (EL_HAS_AUTO_MARGINS &&
                            el->el_display[el->el_cursor.v][0] != '\0') {
                                size_t h = (size_t)
                                    (el->el_terminal.t_size.h - 1);
                                for (; h > 0 &&
                                         el->el_display[el->el_cursor.v][h] ==
                                                 MB_FILL_CHAR;
                                         h--)
                                                continue;
                                /* move without newline */
                                terminal_move_to_char(el, (int)h);
                                terminal_overwrite(el, &el->el_display
                                    [el->el_cursor.v][el->el_cursor.h],
                                    (size_t)(el->el_terminal.t_size.h -
                                    el->el_cursor.h));
                                /* updates Cursor */
                                del--;
                        } else {
                                if ((del > 1) && GoodStr(T_DO)) {
                                        terminal_tputs(el, tgoto(Str(T_DO), del,
                                            del), del);
                                        del = 0;
                                } else {
                                        for (; del > 0; del--)
                                                terminal__putc(el, '\n');
                                        /* because the \n will become \r\n */
                                        el->el_cursor.h = 0;
                                }
                        }
                }
        } else {                /* del < 0 */
                if (GoodStr(T_UP) && (-del > 1 || !GoodStr(T_up)))
                        terminal_tputs(el, tgoto(Str(T_UP), -del, -del), -del);
                else {
                        if (GoodStr(T_up))
                                for (; del < 0; del++)
                                        terminal_tputs(el, Str(T_up), 1);
                }
        }
        el->el_cursor.v = where;/* now where is here */
}


/* terminal_move_to_char():
 *      Move to the character position specified
 */
libedit_private void
terminal_move_to_char(EditLine *el, int where)
{
        int del, i;

mc_again:
        if (where == el->el_cursor.h)
                return;

        if (where > el->el_terminal.t_size.h) {
#ifdef DEBUG_SCREEN
                (void) fprintf(el->el_errfile,
                    "%s: where is ridiculous: %d\r\n", __func__, where);
#endif /* DEBUG_SCREEN */
                return;
        }
        if (!where) {           /* if where is first column */
                terminal__putc(el, '\r');       /* do a CR */
                el->el_cursor.h = 0;
                return;
        }
        del = where - el->el_cursor.h;

        if ((del < -4 || del > 4) && GoodStr(T_ch))
                /* go there directly */
                terminal_tputs(el, tgoto(Str(T_ch), where, where), where);
        else {
                if (del > 0) {  /* moving forward */
                        if ((del > 4) && GoodStr(T_RI))
                                terminal_tputs(el, tgoto(Str(T_RI), del, del),
                                    del);
                        else {
                                        /* if I can do tabs, use them */
                                if (EL_CAN_TAB) {
                                        if ((el->el_cursor.h & 0370) !=
                                            (where & ~0x7)
                                            && (el->el_display[
                                            el->el_cursor.v][where & 0370] !=
                                            MB_FILL_CHAR)
                                            ) {
                                                /* if not within tab stop */
                                                for (i =
                                                    (el->el_cursor.h & 0370);
                                                    i < (where & ~0x7);
                                                    i += 8)
                                                        terminal__putc(el,
                                                            '\t');
                                                        /* then tab over */
                                                el->el_cursor.h = where & ~0x7;
                                        }
                                }
                                /*
                                 * it's usually cheaper to just write the
                                 * chars, so we do.
                                 */
                                /*
                                 * NOTE THAT terminal_overwrite() WILL CHANGE
                                 * el->el_cursor.h!!!
                                 */
                                terminal_overwrite(el, &el->el_display[
                                    el->el_cursor.v][el->el_cursor.h],
                                    (size_t)(where - el->el_cursor.h));

                        }
                } else {        /* del < 0 := moving backward */
                        if ((-del > 4) && GoodStr(T_LE))
                                terminal_tputs(el, tgoto(Str(T_LE), -del, -del),
                                    -del);
                        else {  /* can't go directly there */
                                /*
                                 * if the "cost" is greater than the "cost"
                                 * from col 0
                                 */
                                if (EL_CAN_TAB ?
                                    ((unsigned int)-del >
                                    (((unsigned int) where >> 3) +
                                     (where & 07)))
                                    : (-del > where)) {
                                        terminal__putc(el, '\r');/* do a CR */
                                        el->el_cursor.h = 0;
                                        goto mc_again;  /* and try again */
                                }
                                for (i = 0; i < -del; i++)
                                        terminal__putc(el, '\b');
                        }
                }
        }
        el->el_cursor.h = where;                /* now where is here */
}


/* terminal_overwrite():
 *      Overstrike num characters
 *      Assumes MB_FILL_CHARs are present to keep the column count correct
 */
libedit_private void
terminal_overwrite(EditLine *el, const wchar_t *cp, size_t n)
{
        if (n == 0)
                return;

        if (n > (size_t)el->el_terminal.t_size.h) {
#ifdef DEBUG_SCREEN
                (void) fprintf(el->el_errfile,
                    "%s: n is ridiculous: %zu\r\n", __func__, n);
#endif /* DEBUG_SCREEN */
                return;
        }

        do {
                /* terminal__putc() ignores any MB_FILL_CHARs */
                terminal__putc(el, *cp++);
                el->el_cursor.h++;
        } while (--n);

        if (el->el_cursor.h >= el->el_terminal.t_size.h) {      /* wrap? */
                if (EL_HAS_AUTO_MARGINS) {      /* yes */
                        el->el_cursor.h = 0;
                        el->el_cursor.v++;
                        if (EL_HAS_MAGIC_MARGINS) {
                                /* force the wrap to avoid the "magic"
                                 * situation */
                                wchar_t c;
                                if ((c = el->el_display[el->el_cursor.v]
                                    [el->el_cursor.h]) != '\0') {
                                        terminal_overwrite(el, &c, (size_t)1);
                                        while (el->el_display[el->el_cursor.v]
                                            [el->el_cursor.h] == MB_FILL_CHAR)
                                                el->el_cursor.h++;
                                } else {
                                        terminal__putc(el, ' ');
                                        el->el_cursor.h = 1;
                                }
                        }
                } else          /* no wrap, but cursor stays on screen */
                        el->el_cursor.h = el->el_terminal.t_size.h - 1;
        }
}


/* terminal_deletechars():
 *      Delete num characters
 */
libedit_private void
terminal_deletechars(EditLine *el, int num)
{
        if (num <= 0)
                return;

        if (!EL_CAN_DELETE) {
#ifdef DEBUG_EDIT
                (void) fprintf(el->el_errfile, "   ERROR: cannot delete   \n");
#endif /* DEBUG_EDIT */
                return;
        }
        if (num > el->el_terminal.t_size.h) {
#ifdef DEBUG_SCREEN
                (void) fprintf(el->el_errfile,
                    "%s: num is ridiculous: %d\r\n", __func__, num);
#endif /* DEBUG_SCREEN */
                return;
        }
        if (GoodStr(T_DC))      /* if I have multiple delete */
                if ((num > 1) || !GoodStr(T_dc)) {      /* if dc would be more
                                                         * expen. */
                        terminal_tputs(el, tgoto(Str(T_DC), num, num), num);
                        return;
                }
        if (GoodStr(T_dm))      /* if I have delete mode */
                terminal_tputs(el, Str(T_dm), 1);

        if (GoodStr(T_dc))      /* else do one at a time */
                while (num--)
                        terminal_tputs(el, Str(T_dc), 1);

        if (GoodStr(T_ed))      /* if I have delete mode */
                terminal_tputs(el, Str(T_ed), 1);
}


/* terminal_insertwrite():
 *      Puts terminal in insert character mode or inserts num
 *      characters in the line
 *      Assumes MB_FILL_CHARs are present to keep column count correct
 */
libedit_private void
terminal_insertwrite(EditLine *el, wchar_t *cp, int num)
{
        if (num <= 0)
                return;
        if (!EL_CAN_INSERT) {
#ifdef DEBUG_EDIT
                (void) fprintf(el->el_errfile, "   ERROR: cannot insert   \n");
#endif /* DEBUG_EDIT */
                return;
        }
        if (num > el->el_terminal.t_size.h) {
#ifdef DEBUG_SCREEN
                (void) fprintf(el->el_errfile,
                    "%s: num is ridiculous: %d\r\n", __func__, num);
#endif /* DEBUG_SCREEN */
                return;
        }
        if (GoodStr(T_IC))      /* if I have multiple insert */
                if ((num > 1) || !GoodStr(T_ic)) {
                                /* if ic would be more expensive */
                        terminal_tputs(el, tgoto(Str(T_IC), num, num), num);
                        terminal_overwrite(el, cp, (size_t)num);
                                /* this updates el_cursor.h */
                        return;
                }
        if (GoodStr(T_im) && GoodStr(T_ei)) {   /* if I have insert mode */
                terminal_tputs(el, Str(T_im), 1);

                el->el_cursor.h += num;
                do
                        terminal__putc(el, *cp++);
                while (--num);

                if (GoodStr(T_ip))      /* have to make num chars insert */
                        terminal_tputs(el, Str(T_ip), 1);

                terminal_tputs(el, Str(T_ei), 1);
                return;
        }
        do {
                if (GoodStr(T_ic))      /* have to make num chars insert */
                        terminal_tputs(el, Str(T_ic), 1);

                terminal__putc(el, *cp++);

                el->el_cursor.h++;

                if (GoodStr(T_ip))      /* have to make num chars insert */
                        terminal_tputs(el, Str(T_ip), 1);
                                        /* pad the inserted char */

        } while (--num);
}


/* terminal_clear_EOL():
 *      clear to end of line.  There are num characters to clear
 */
libedit_private void
terminal_clear_EOL(EditLine *el, int num)
{
        int i;

        if (EL_CAN_CEOL && GoodStr(T_ce))
                terminal_tputs(el, Str(T_ce), 1);
        else {
                for (i = 0; i < num; i++)
                        terminal__putc(el, ' ');
                el->el_cursor.h += num; /* have written num spaces */
        }
}


/* terminal_clear_screen():
 *      Clear the screen
 */
libedit_private void
terminal_clear_screen(EditLine *el)
{                               /* clear the whole screen and home */

        if (GoodStr(T_cl))
                /* send the clear screen code */
                terminal_tputs(el, Str(T_cl), Val(T_li));
        else if (GoodStr(T_ho) && GoodStr(T_cd)) {
                terminal_tputs(el, Str(T_ho), Val(T_li));       /* home */
                /* clear to bottom of screen */
                terminal_tputs(el, Str(T_cd), Val(T_li));
        } else {
                terminal__putc(el, '\r');
                terminal__putc(el, '\n');
        }
}


/* terminal_beep():
 *      Beep the way the terminal wants us
 */
libedit_private void
terminal_beep(EditLine *el)
{
        if (GoodStr(T_bl))
                /* what termcap says we should use */
                terminal_tputs(el, Str(T_bl), 1);
        else
                terminal__putc(el, '\007');     /* an ASCII bell; ^G */
}


libedit_private void
terminal_get(EditLine *el, const char **term)
{
        *term = el->el_terminal.t_name;
}


/* terminal_set():
 *      Read in the terminal capabilities from the requested terminal
 */
libedit_private int
terminal_set(EditLine *el, const char *term)
{
        int i;
        char buf[TC_BUFSIZE];
        char *area;
        const struct termcapstr *t;
        sigset_t oset, nset;
        int lins, cols;

        (void) sigemptyset(&nset);
        (void) sigaddset(&nset, SIGWINCH);
        (void) sigprocmask(SIG_BLOCK, &nset, &oset);

        area = buf;


        if (term == NULL)
                term = getenv("TERM");

        if (!term || !term[0])
                term = "dumb";

        if (strcmp(term, "emacs") == 0)
                el->el_flags |= EDIT_DISABLED;

        (void) memset(el->el_terminal.t_cap, 0, TC_BUFSIZE);

        i = tgetent(el->el_terminal.t_cap, term);

        if (i <= 0) {
                if (i == -1)
                        (void) fprintf(el->el_errfile,
                            "Cannot read termcap database;\n");
                else if (i == 0)
                        (void) fprintf(el->el_errfile,
                            "No entry for terminal type \"%s\";\n", term);
                (void) fprintf(el->el_errfile,
                    "using dumb terminal settings.\n");
                Val(T_co) = 80; /* do a dumb terminal */
                Val(T_pt) = Val(T_km) = Val(T_li) = 0;
                Val(T_xt) = Val(T_MT);
                for (t = tstr; t->name != NULL; t++)
                        terminal_alloc(el, t, NULL);
        } else {
                /* auto/magic margins */
                Val(T_am) = tgetflag("am");
                Val(T_xn) = tgetflag("xn");
                /* Can we tab */
                Val(T_pt) = tgetflag("pt");
                Val(T_xt) = tgetflag("xt");
                /* do we have a meta? */
                Val(T_km) = tgetflag("km");
                Val(T_MT) = tgetflag("MT");
                /* Get the size */
                Val(T_co) = tgetnum("co");
                Val(T_li) = tgetnum("li");
                for (t = tstr; t->name != NULL; t++) {
                        /* XXX: some systems' tgetstr needs non const */
                        terminal_alloc(el, t, tgetstr(strchr(t->name, *t->name),
                            &area));
                }
        }

        if (Val(T_co) < 2)
                Val(T_co) = 80; /* just in case */
        if (Val(T_li) < 1)
                Val(T_li) = 24;

        el->el_terminal.t_size.v = Val(T_co);
        el->el_terminal.t_size.h = Val(T_li);

        terminal_setflags(el);

                                /* get the correct window size */
        (void) terminal_get_size(el, &lins, &cols);
        if (terminal_change_size(el, lins, cols) == -1)
                return -1;
        (void) sigprocmask(SIG_SETMASK, &oset, NULL);
        terminal_bind_arrow(el);
        el->el_terminal.t_name = term;
        return i <= 0 ? -1 : 0;
}


/* terminal_get_size():
 *      Return the new window size in lines and cols, and
 *      true if the size was changed.
 */
libedit_private int
terminal_get_size(EditLine *el, int *lins, int *cols)
{

        *cols = Val(T_co);
        *lins = Val(T_li);

#ifdef TIOCGWINSZ
        {
                struct winsize ws;
                if (ioctl(el->el_infd, TIOCGWINSZ, &ws) != -1) {
                        if (ws.ws_col)
                                *cols = ws.ws_col;
                        if (ws.ws_row)
                                *lins = ws.ws_row;
                }
        }
#endif
#ifdef TIOCGSIZE
        {
                struct ttysize ts;
                if (ioctl(el->el_infd, TIOCGSIZE, &ts) != -1) {
                        if (ts.ts_cols)
                                *cols = ts.ts_cols;
                        if (ts.ts_lines)
                                *lins = ts.ts_lines;
                }
        }
#endif
        return Val(T_co) != *cols || Val(T_li) != *lins;
}


/* terminal_change_size():
 *      Change the size of the terminal
 */
libedit_private int
terminal_change_size(EditLine *el, int lins, int cols)
{
        /*
         * Just in case
         */
        Val(T_co) = (cols < 2) ? 80 : cols;
        Val(T_li) = (lins < 1) ? 24 : lins;

        /* re-make display buffers */
        if (terminal_rebuffer_display(el) == -1)
                return -1;
        re_clear_display(el);
        return 0;
}


/* terminal_init_arrow():
 *      Initialize the arrow key bindings from termcap
 */
static void
terminal_init_arrow(EditLine *el)
{
        funckey_t *arrow = el->el_terminal.t_fkey;

        arrow[A_K_DN].name = L"down";
        arrow[A_K_DN].key = T_kd;
        arrow[A_K_DN].fun.cmd = ED_NEXT_HISTORY;
        arrow[A_K_DN].type = XK_CMD;

        arrow[A_K_UP].name = L"up";
        arrow[A_K_UP].key = T_ku;
        arrow[A_K_UP].fun.cmd = ED_PREV_HISTORY;
        arrow[A_K_UP].type = XK_CMD;

        arrow[A_K_LT].name = L"left";
        arrow[A_K_LT].key = T_kl;
        arrow[A_K_LT].fun.cmd = ED_PREV_CHAR;
        arrow[A_K_LT].type = XK_CMD;

        arrow[A_K_RT].name = L"right";
        arrow[A_K_RT].key = T_kr;
        arrow[A_K_RT].fun.cmd = ED_NEXT_CHAR;
        arrow[A_K_RT].type = XK_CMD;

        arrow[A_K_HO].name = L"home";
        arrow[A_K_HO].key = T_kh;
        arrow[A_K_HO].fun.cmd = ED_MOVE_TO_BEG;
        arrow[A_K_HO].type = XK_CMD;

        arrow[A_K_EN].name = L"end";
        arrow[A_K_EN].key = T_at7;
        arrow[A_K_EN].fun.cmd = ED_MOVE_TO_END;
        arrow[A_K_EN].type = XK_CMD;

        arrow[A_K_DE].name = L"delete";
        arrow[A_K_DE].key = T_kD;
        arrow[A_K_DE].fun.cmd = ED_DELETE_NEXT_CHAR;
        arrow[A_K_DE].type = XK_CMD;
}


/* terminal_reset_arrow():
 *      Reset arrow key bindings
 */
static void
terminal_reset_arrow(EditLine *el)
{
        funckey_t *arrow = el->el_terminal.t_fkey;
        static const wchar_t strA[] = L"\033[A";
        static const wchar_t strB[] = L"\033[B";
        static const wchar_t strC[] = L"\033[C";
        static const wchar_t strD[] = L"\033[D";
        static const wchar_t strH[] = L"\033[H";
        static const wchar_t strF[] = L"\033[F";
        static const wchar_t stOA[] = L"\033OA";
        static const wchar_t stOB[] = L"\033OB";
        static const wchar_t stOC[] = L"\033OC";
        static const wchar_t stOD[] = L"\033OD";
        static const wchar_t stOH[] = L"\033OH";
        static const wchar_t stOF[] = L"\033OF";

        keymacro_add(el, strA, &arrow[A_K_UP].fun, arrow[A_K_UP].type);
        keymacro_add(el, strB, &arrow[A_K_DN].fun, arrow[A_K_DN].type);
        keymacro_add(el, strC, &arrow[A_K_RT].fun, arrow[A_K_RT].type);
        keymacro_add(el, strD, &arrow[A_K_LT].fun, arrow[A_K_LT].type);
        keymacro_add(el, strH, &arrow[A_K_HO].fun, arrow[A_K_HO].type);
        keymacro_add(el, strF, &arrow[A_K_EN].fun, arrow[A_K_EN].type);
        keymacro_add(el, stOA, &arrow[A_K_UP].fun, arrow[A_K_UP].type);
        keymacro_add(el, stOB, &arrow[A_K_DN].fun, arrow[A_K_DN].type);
        keymacro_add(el, stOC, &arrow[A_K_RT].fun, arrow[A_K_RT].type);
        keymacro_add(el, stOD, &arrow[A_K_LT].fun, arrow[A_K_LT].type);
        keymacro_add(el, stOH, &arrow[A_K_HO].fun, arrow[A_K_HO].type);
        keymacro_add(el, stOF, &arrow[A_K_EN].fun, arrow[A_K_EN].type);

        if (el->el_map.type != MAP_VI)
                return;
        keymacro_add(el, &strA[1], &arrow[A_K_UP].fun, arrow[A_K_UP].type);
        keymacro_add(el, &strB[1], &arrow[A_K_DN].fun, arrow[A_K_DN].type);
        keymacro_add(el, &strC[1], &arrow[A_K_RT].fun, arrow[A_K_RT].type);
        keymacro_add(el, &strD[1], &arrow[A_K_LT].fun, arrow[A_K_LT].type);
        keymacro_add(el, &strH[1], &arrow[A_K_HO].fun, arrow[A_K_HO].type);
        keymacro_add(el, &strF[1], &arrow[A_K_EN].fun, arrow[A_K_EN].type);
        keymacro_add(el, &stOA[1], &arrow[A_K_UP].fun, arrow[A_K_UP].type);
        keymacro_add(el, &stOB[1], &arrow[A_K_DN].fun, arrow[A_K_DN].type);
        keymacro_add(el, &stOC[1], &arrow[A_K_RT].fun, arrow[A_K_RT].type);
        keymacro_add(el, &stOD[1], &arrow[A_K_LT].fun, arrow[A_K_LT].type);
        keymacro_add(el, &stOH[1], &arrow[A_K_HO].fun, arrow[A_K_HO].type);
        keymacro_add(el, &stOF[1], &arrow[A_K_EN].fun, arrow[A_K_EN].type);
}


/* terminal_set_arrow():
 *      Set an arrow key binding
 */
libedit_private int
terminal_set_arrow(EditLine *el, const wchar_t *name, keymacro_value_t *fun,
    int type)
{
        funckey_t *arrow = el->el_terminal.t_fkey;
        int i;

        for (i = 0; i < A_K_NKEYS; i++)
                if (wcscmp(name, arrow[i].name) == 0) {
                        arrow[i].fun = *fun;
                        arrow[i].type = type;
                        return 0;
                }
        return -1;
}


/* terminal_clear_arrow():
 *      Clear an arrow key binding
 */
libedit_private int
terminal_clear_arrow(EditLine *el, const wchar_t *name)
{
        funckey_t *arrow = el->el_terminal.t_fkey;
        int i;

        for (i = 0; i < A_K_NKEYS; i++)
                if (wcscmp(name, arrow[i].name) == 0) {
                        arrow[i].type = XK_NOD;
                        return 0;
                }
        return -1;
}


/* terminal_print_arrow():
 *      Print the arrow key bindings
 */
libedit_private void
terminal_print_arrow(EditLine *el, const wchar_t *name)
{
        int i;
        funckey_t *arrow = el->el_terminal.t_fkey;

        for (i = 0; i < A_K_NKEYS; i++)
                if (*name == '\0' || wcscmp(name, arrow[i].name) == 0)
                        if (arrow[i].type != XK_NOD)
                                keymacro_kprint(el, arrow[i].name,
                                    &arrow[i].fun, arrow[i].type);
}


/* terminal_bind_arrow():
 *      Bind the arrow keys
 */
libedit_private void
terminal_bind_arrow(EditLine *el)
{
        el_action_t *map;
        const el_action_t *dmap;
        int i, j;
        char *p;
        funckey_t *arrow = el->el_terminal.t_fkey;

        /* Check if the components needed are initialized */
        if (el->el_terminal.t_buf == NULL || el->el_map.key == NULL)
                return;

        map = el->el_map.type == MAP_VI ? el->el_map.alt : el->el_map.key;
        dmap = el->el_map.type == MAP_VI ? el->el_map.vic : el->el_map.emacs;

        terminal_reset_arrow(el);

        for (i = 0; i < A_K_NKEYS; i++) {
                wchar_t wt_str[VISUAL_WIDTH_MAX];
                wchar_t *px;
                size_t n;

                p = el->el_terminal.t_str[arrow[i].key];
                if (!p || !*p)
                        continue;
                for (n = 0; n < VISUAL_WIDTH_MAX && p[n]; ++n)
                        wt_str[n] = p[n];
                while (n < VISUAL_WIDTH_MAX)
                        wt_str[n++] = '\0';
                px = wt_str;
                j = (unsigned char) *p;
                /*
                 * Assign the arrow keys only if:
                 *
                 * 1. They are multi-character arrow keys and the user
                 *    has not re-assigned the leading character, or
                 *    has re-assigned the leading character to be
                 *        ED_SEQUENCE_LEAD_IN
                 * 2. They are single arrow keys pointing to an
                 *    unassigned key.
                 */
                if (arrow[i].type == XK_NOD)
                        keymacro_clear(el, map, px);
                else {
                        if (p[1] && (dmap[j] == map[j] ||
                                map[j] == ED_SEQUENCE_LEAD_IN)) {
                                keymacro_add(el, px, &arrow[i].fun,
                                    arrow[i].type);
                                map[j] = ED_SEQUENCE_LEAD_IN;
                        } else if (map[j] == ED_UNASSIGNED) {
                                keymacro_clear(el, map, px);
                                if (arrow[i].type == XK_CMD)
                                        map[j] = arrow[i].fun.cmd;
                                else
                                        keymacro_add(el, px, &arrow[i].fun,
                                            arrow[i].type);
                        }
                }
        }
}

/* terminal_putc():
 *      Add a character
 */
static int
terminal_putc(int c)
{
        if (terminal_outfile == NULL)
                return -1;
        return fputc(c, terminal_outfile);
}

static void
terminal_tputs(EditLine *el, const char *cap, int affcnt)
{
#ifdef _REENTRANT
        pthread_mutex_lock(&terminal_mutex);
#endif
        terminal_outfile = el->el_outfile;
        (void)tputs(cap, affcnt, terminal_putc);
#ifdef _REENTRANT
        pthread_mutex_unlock(&terminal_mutex);
#endif
}

/* terminal__putc():
 *      Add a character
 */
libedit_private int
terminal__putc(EditLine *el, wint_t c)
{
        char buf[MB_LEN_MAX +1];
        ssize_t i;
        if (c == (wint_t)MB_FILL_CHAR)
                return 0;
        i = ct_encode_char(buf, (size_t)MB_LEN_MAX, c);
        if (i <= 0)
                return (int)i;
        buf[i] = '\0';
        return fputs(buf, el->el_outfile);
}

/* terminal__flush():
 *      Flush output
 */
libedit_private void
terminal__flush(EditLine *el)
{

        (void) fflush(el->el_outfile);
}

/* terminal_writec():
 *      Write the given character out, in a human readable form
 */
libedit_private void
terminal_writec(EditLine *el, wint_t c)
{
        wchar_t visbuf[VISUAL_WIDTH_MAX +1];
        ssize_t vcnt = ct_visual_char(visbuf, VISUAL_WIDTH_MAX, c);
        if (vcnt < 0)
                vcnt = 0;
        visbuf[vcnt] = '\0';
        terminal_overwrite(el, visbuf, (size_t)vcnt);
        terminal__flush(el);
}


/* terminal_telltc():
 *      Print the current termcap characteristics
 */
libedit_private int
/*ARGSUSED*/
terminal_telltc(EditLine *el, int argc __attribute__((__unused__)),
    const wchar_t **argv __attribute__((__unused__)))
{
        const struct termcapstr *t;
        char **ts;

        (void) fprintf(el->el_outfile, "\n\tYour terminal has the\n");
        (void) fprintf(el->el_outfile, "\tfollowing characteristics:\n\n");
        (void) fprintf(el->el_outfile, "\tIt has %d columns and %d lines\n",
            Val(T_co), Val(T_li));
        (void) fprintf(el->el_outfile,
            "\tIt has %s meta key\n", EL_HAS_META ? "a" : "no");
        (void) fprintf(el->el_outfile,
            "\tIt can%suse tabs\n", EL_CAN_TAB ? " " : "not ");
        (void) fprintf(el->el_outfile, "\tIt %s automatic margins\n",
            EL_HAS_AUTO_MARGINS ? "has" : "does not have");
        if (EL_HAS_AUTO_MARGINS)
                (void) fprintf(el->el_outfile, "\tIt %s magic margins\n",
                    EL_HAS_MAGIC_MARGINS ? "has" : "does not have");

        for (t = tstr, ts = el->el_terminal.t_str; t->name != NULL; t++, ts++) {
                const char *ub;
                if (*ts && **ts) {
                        ub = ct_encode_string(ct_visual_string(
                            ct_decode_string(*ts, &el->el_scratch),
                            &el->el_visual), &el->el_scratch);
                } else {
                        ub = "(empty)";
                }
                (void) fprintf(el->el_outfile, "\t%25s (%s) == %s\n",
                    t->long_name, t->name, ub);
        }
        (void) fputc('\n', el->el_outfile);
        return 0;
}


/* terminal_settc():
 *      Change the current terminal characteristics
 */
libedit_private int
/*ARGSUSED*/
terminal_settc(EditLine *el, int argc __attribute__((__unused__)),
    const wchar_t **argv)
{
        const struct termcapstr *ts;
        const struct termcapval *tv;
        char what[8], how[8];

        if (argv == NULL || argv[1] == NULL || argv[2] == NULL)
                return -1;

        strncpy(what, ct_encode_string(argv[1], &el->el_scratch), sizeof(what));
        what[sizeof(what) - 1] = '\0';
        strncpy(how,  ct_encode_string(argv[2], &el->el_scratch), sizeof(how));
        how[sizeof(how) - 1] = '\0';

        /*
         * Do the strings first
         */
        for (ts = tstr; ts->name != NULL; ts++)
                if (strcmp(ts->name, what) == 0)
                        break;

        if (ts->name != NULL) {
                terminal_alloc(el, ts, how);
                terminal_setflags(el);
                return 0;
        }
        /*
         * Do the numeric ones second
         */
        for (tv = tval; tv->name != NULL; tv++)
                if (strcmp(tv->name, what) == 0)
                        break;

        if (tv->name != NULL)
                return -1;

        if (tv == &tval[T_pt] || tv == &tval[T_km] ||
            tv == &tval[T_am] || tv == &tval[T_xn]) {
                if (strcmp(how, "yes") == 0)
                        el->el_terminal.t_val[tv - tval] = 1;
                else if (strcmp(how, "no") == 0)
                        el->el_terminal.t_val[tv - tval] = 0;
                else {
                        (void) fprintf(el->el_errfile,
                            "%ls: Bad value `%s'.\n", argv[0], how);
                        return -1;
                }
                terminal_setflags(el);
                if (terminal_change_size(el, Val(T_li), Val(T_co)) == -1)
                        return -1;
                return 0;
        } else {
                long i;
                char *ep;

                i = strtol(how, &ep, 10);
                if (*ep != '\0') {
                        (void) fprintf(el->el_errfile,
                            "%ls: Bad value `%s'.\n", argv[0], how);
                        return -1;
                }
                el->el_terminal.t_val[tv - tval] = (int) i;
                el->el_terminal.t_size.v = Val(T_co);
                el->el_terminal.t_size.h = Val(T_li);
                if (tv == &tval[T_co] || tv == &tval[T_li])
                        if (terminal_change_size(el, Val(T_li), Val(T_co))
                            == -1)
                                return -1;
                return 0;
        }
}


/* terminal_gettc():
 *      Get the current terminal characteristics
 */
libedit_private int
/*ARGSUSED*/
terminal_gettc(EditLine *el, int argc __attribute__((__unused__)), char **argv)
{
        const struct termcapstr *ts;
        const struct termcapval *tv;
        char *what;
        void *how;

        if (argv == NULL || argv[1] == NULL || argv[2] == NULL)
                return -1;

        what = argv[1];
        how = argv[2];

        /*
         * Do the strings first
         */
        for (ts = tstr; ts->name != NULL; ts++)
                if (strcmp(ts->name, what) == 0)
                        break;

        if (ts->name != NULL) {
                *(char **)how = el->el_terminal.t_str[ts - tstr];
                return 0;
        }
        /*
         * Do the numeric ones second
         */
        for (tv = tval; tv->name != NULL; tv++)
                if (strcmp(tv->name, what) == 0)
                        break;

        if (tv->name == NULL)
                return -1;

        if (tv == &tval[T_pt] || tv == &tval[T_km] ||
            tv == &tval[T_am] || tv == &tval[T_xn]) {
                static char yes[] = "yes";
                static char no[] = "no";
                if (el->el_terminal.t_val[tv - tval])
                        *(char **)how = yes;
                else
                        *(char **)how = no;
                return 0;
        } else {
                *(int *)how = el->el_terminal.t_val[tv - tval];
                return 0;
        }
}

/* terminal_echotc():
 *      Print the termcap string out with variable substitution
 */
libedit_private int
/*ARGSUSED*/
terminal_echotc(EditLine *el, int argc __attribute__((__unused__)),
    const wchar_t **argv)
{
        char *cap, *scap;
        wchar_t *ep;
        int arg_need, arg_cols, arg_rows;
        int verbose = 0, silent = 0;
        char *area;
        static const char fmts[] = "%s\n", fmtd[] = "%d\n";
        const struct termcapstr *t;
        char buf[TC_BUFSIZE];
        long i;

        area = buf;

        if (argv == NULL || argv[1] == NULL)
                return -1;
        argv++;

        if (argv[0][0] == '-') {
                switch (argv[0][1]) {
                case 'v':
                        verbose = 1;
                        break;
                case 's':
                        silent = 1;
                        break;
                default:
                        /* stderror(ERR_NAME | ERR_TCUSAGE); */
                        break;
                }
                argv++;
        }
        if (!*argv || *argv[0] == '\0')
                return 0;
        if (wcscmp(*argv, L"tabs") == 0) {
                (void) fprintf(el->el_outfile, fmts, EL_CAN_TAB ? "yes" : "no");
                return 0;
        } else if (wcscmp(*argv, L"meta") == 0) {
                (void) fprintf(el->el_outfile, fmts, Val(T_km) ? "yes" : "no");
                return 0;
        } else if (wcscmp(*argv, L"xn") == 0) {
                (void) fprintf(el->el_outfile, fmts, EL_HAS_MAGIC_MARGINS ?
                    "yes" : "no");
                return 0;
        } else if (wcscmp(*argv, L"am") == 0) {
                (void) fprintf(el->el_outfile, fmts, EL_HAS_AUTO_MARGINS ?
                    "yes" : "no");
                return 0;
        } else if (wcscmp(*argv, L"baud") == 0) {
                (void) fprintf(el->el_outfile, fmtd, (int)el->el_tty.t_speed);
                return 0;
        } else if (wcscmp(*argv, L"rows") == 0 ||
                   wcscmp(*argv, L"lines") == 0) {
                (void) fprintf(el->el_outfile, fmtd, Val(T_li));
                return 0;
        } else if (wcscmp(*argv, L"cols") == 0) {
                (void) fprintf(el->el_outfile, fmtd, Val(T_co));
                return 0;
        }
        /*
         * Try to use our local definition first
         */
        scap = NULL;
        for (t = tstr; t->name != NULL; t++)
                if (strcmp(t->name,
                    ct_encode_string(*argv, &el->el_scratch)) == 0) {
                        scap = el->el_terminal.t_str[t - tstr];
                        break;
                }
        if (t->name == NULL) {
                /* XXX: some systems' tgetstr needs non const */
                scap = tgetstr(ct_encode_string(*argv, &el->el_scratch), &area);
        }
        if (!scap || scap[0] == '\0') {
                if (!silent)
                        (void) fprintf(el->el_errfile,
                            "echotc: Termcap parameter `%ls' not found.\n",
                            *argv);
                return -1;
        }
        /*
         * Count home many values we need for this capability.
         */
        for (cap = scap, arg_need = 0; *cap; cap++)
                if (*cap == '%')
                        switch (*++cap) {
                        case 'd':
                        case '2':
                        case '3':
                        case '.':
                        case '+':
                                arg_need++;
                                break;
                        case '%':
                        case '>':
                        case 'i':
                        case 'r':
                        case 'n':
                        case 'B':
                        case 'D':
                                break;
                        default:
                                /*
                                 * hpux has lot's of them...
                                 */
                                if (verbose)
                                        (void) fprintf(el->el_errfile,
                                "echotc: Warning: unknown termcap %% `%c'.\n",
                                            *cap);
                                /* This is bad, but I won't complain */
                                break;
                        }

        switch (arg_need) {
        case 0:
                argv++;
                if (*argv && *argv[0]) {
                        if (!silent)
                                (void) fprintf(el->el_errfile,
                                    "echotc: Warning: Extra argument `%ls'.\n",
                                    *argv);
                        return -1;
                }
                terminal_tputs(el, scap, 1);
                break;
        case 1:
                argv++;
                if (!*argv || *argv[0] == '\0') {
                        if (!silent)
                                (void) fprintf(el->el_errfile,
                                    "echotc: Warning: Missing argument.\n");
                        return -1;
                }
                arg_cols = 0;
                i = wcstol(*argv, &ep, 10);
                if (*ep != '\0' || i < 0) {
                        if (!silent)
                                (void) fprintf(el->el_errfile,
                                    "echotc: Bad value `%ls' for rows.\n",
                                    *argv);
                        return -1;
                }
                arg_rows = (int) i;
                argv++;
                if (*argv && *argv[0]) {
                        if (!silent)
                                (void) fprintf(el->el_errfile,
                                    "echotc: Warning: Extra argument `%ls"
                                    "'.\n", *argv);
                        return -1;
                }
                terminal_tputs(el, tgoto(scap, arg_cols, arg_rows), 1);
                break;
        default:
                /* This is wrong, but I will ignore it... */
                if (verbose)
                        (void) fprintf(el->el_errfile,
                         "echotc: Warning: Too many required arguments (%d).\n",
                            arg_need);
                /* FALLTHROUGH */
        case 2:
                argv++;
                if (!*argv || *argv[0] == '\0') {
                        if (!silent)
                                (void) fprintf(el->el_errfile,
                                    "echotc: Warning: Missing argument.\n");
                        return -1;
                }
                i = wcstol(*argv, &ep, 10);
                if (*ep != '\0' || i < 0) {
                        if (!silent)
                                (void) fprintf(el->el_errfile,
                                    "echotc: Bad value `%ls' for cols.\n",
                                    *argv);
                        return -1;
                }
                arg_cols = (int) i;
                argv++;
                if (!*argv || *argv[0] == '\0') {
                        if (!silent)
                                (void) fprintf(el->el_errfile,
                                    "echotc: Warning: Missing argument.\n");
                        return -1;
                }
                i = wcstol(*argv, &ep, 10);
                if (*ep != '\0' || i < 0) {
                        if (!silent)
                                (void) fprintf(el->el_errfile,
                                    "echotc: Bad value `%ls' for rows.\n",
                                    *argv);
                        return -1;
                }
                arg_rows = (int) i;
                if (*ep != '\0') {
                        if (!silent)
                                (void) fprintf(el->el_errfile,
                                    "echotc: Bad value `%ls'.\n", *argv);
                        return -1;
                }
                argv++;
                if (*argv && *argv[0]) {
                        if (!silent)
                                (void) fprintf(el->el_errfile,
                                    "echotc: Warning: Extra argument `%ls"
                                    "'.\n", *argv);
                        return -1;
                }
                terminal_tputs(el, tgoto(scap, arg_cols, arg_rows), arg_rows);
                break;
        }
        return 0;
}