CU Amiga Super CD-ROM 24/CU Amiga Magazine's Super CD-ROM 24 (1998)(EMAP Images)(GB)(Track 1 of 2)[!][issue 1998-07].iso/CUCD/Utilities/vim-5.1/src/buffer.c

C/C++ Source or Header | 1998-03-28 | 52.1 KB | 2,267 lines

/* vi:set ts=8 sts=4 sw=4:
 *
 * VIM - Vi IMproved    by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 */

/*
 * buffer.c: functions for dealing with the buffer structure
 */

/*
 * The buffer list is a double linked list of all buffers.
 * Each buffer can be in one of these states:
 * never loaded: BF_NEVERLOADED is set, only the file name is valid
 *   not loaded: b_ml.ml_mfp == NULL, no memfile allocated
 *     hidden: b_nwindows == 0, loaded but not displayed in a window
 *     normal: loaded and displayed in a window
 *
 * Instead of storing file names all over the place, each file name is
 * stored in the buffer list. It can be referenced by a number.
 *
 * The current implementation remembers all file names ever used.
 */

#include "vim.h"

static void    enter_buffer __ARGS((BUF *));
static char_u    *buflist_match __ARGS((vim_regexp *prog, BUF *buf));
static char_u    *buflist_match_try __ARGS((vim_regexp *prog, char_u *name));
static void    buflist_setlnum __ARGS((BUF *, linenr_t, colnr_t));
static WINLNUM    *buflist_findwlp __ARGS((BUF *buf));
static int    append_arg_number __ARGS((char_u *, int, int));
static void    free_buffer __ARGS((BUF *));

/*
 * Open current buffer, that is: open the memfile and read the file into memory
 * return FAIL for failure, OK otherwise
 */
    int
open_buffer(read_stdin)
    int        read_stdin;        /* read file from stdin */
{
    int        retval = OK;
#ifdef AUTOCMD
    BUF        *old_curbuf;
    BUF        *new_curbuf;
#endif

    /*
     * The 'readonly' flag is only set when BF_NEVERLOADED is being reset.
     * When re-entering the same buffer, it should not change, because the
     * user may have reset the flag by hand.
     */
    if (readonlymode && curbuf->b_ffname != NULL
                    && (curbuf->b_flags & BF_NEVERLOADED))
    curbuf->b_p_ro = TRUE;

    if (ml_open() == FAIL)
    {
    /*
     * There MUST be a memfile, otherwise we can't do anything
     * If we can't create one for the current buffer, take another buffer
     */
    close_buffer(NULL, curbuf, FALSE, FALSE);
    for (curbuf = firstbuf; curbuf != NULL; curbuf = curbuf->b_next)
        if (curbuf->b_ml.ml_mfp != NULL)
        break;
    /*
     * if there is no memfile at all, exit
     * This is OK, since there are no changes to loose.
     */
    if (curbuf == NULL)
    {
        EMSG("Cannot allocate buffer, exiting...");
        getout(2);
    }
    EMSG("Cannot allocate buffer, using other one...");
    enter_buffer(curbuf);
    return FAIL;
    }
#ifdef AUTOCMD
    /* The autocommands in readfile() may change the buffer, but only AFTER
     * reading the file. */
    old_curbuf = curbuf;
    modified_was_set = FALSE;
#endif
    if (curbuf->b_ffname != NULL)
    retval = readfile(curbuf->b_ffname, curbuf->b_fname,
               (linenr_t)0, (linenr_t)0, (linenr_t)MAXLNUM, READ_NEW);
    else if (read_stdin)
    retval = readfile(NULL, NULL, (linenr_t)0,
               (linenr_t)0, (linenr_t)MAXLNUM, READ_NEW + READ_STDIN);
    else
    {
    MSG("Empty Buffer");
    msg_col = 0;
    msg_didout = FALSE;    /* overwrite this message whenever you like */
    }

    /* if first time loading this buffer, init chartab */
    if (curbuf->b_flags & BF_NEVERLOADED)
    init_chartab();

    /*
     * Set/reset the Changed flag first, autocmds may change the buffer.
     * Apply the automatic commands, before processing the modelines.
     * So the modelines have priority over auto commands.
     */
    /* When reading stdin, the buffer contents always needs writing, so set
     * the changed flag.  Unless in readonly mode: "ls | gview -". */
    if ((read_stdin && !readonlymode)
#ifdef AUTOCMD
        || modified_was_set    /* ":set modified" used in autocmd */
#endif
        )
    CHANGED;
    else if (retval != FAIL)
    UNCHANGED(curbuf);
    curbuf->b_start_ffc = *curbuf->b_p_ff;    /* keep this fileformat */

    /* require "!" to overwrite the file, because it wasn't read completely */
    if (got_int)
    curbuf->b_notedited = TRUE;

#ifdef AUTOCMD
    apply_autocmds(EVENT_BUFENTER, NULL, NULL, FALSE);
#endif

    if (retval != FAIL)
    {
#ifdef AUTOCMD
    /*
     * The autocommands may have changed the current buffer.  Apply the
     * modelines to the correct buffer, if it still exists.
     */
    if (buf_valid(old_curbuf))
    {
        new_curbuf = curbuf;
        curbuf = old_curbuf;
        curwin->w_buffer = old_curbuf;
#endif
        do_modelines();
        curbuf->b_flags &= ~(BF_CHECK_RO | BF_NEVERLOADED);
#ifdef AUTOCMD
        curbuf = new_curbuf;
        curwin->w_buffer = new_curbuf;
    }
#endif
    }

    return retval;
}

/*
 * Return TRUE if "buf" points to a valid buffer (in the buffer list).
 */
    int
buf_valid(buf)
    BUF        *buf;
{
    BUF        *bp;

    for (bp = firstbuf; bp != NULL; bp = bp->b_next)
    if (bp == buf)
        return TRUE;
    return FALSE;
}

/*
 * Close the link to a buffer. If "free_buf" is TRUE free the buffer if it
 * becomes unreferenced. The caller should get a new buffer very soon!
 * if 'del_buf' is TRUE, remove the buffer from the buffer list.
 */
    void
close_buffer(win, buf, free_buf, del_buf)
    WIN        *win;        /* if not NULL, set b_last_cursor */
    BUF        *buf;
    int        free_buf;
    int        del_buf;
{
    if (buf->b_nwindows > 0)
    --buf->b_nwindows;
    if (buf->b_nwindows == 0 && win != NULL)
    set_last_cursor(win);    /* may set b_last_cursor */
    if (buf->b_nwindows > 0 || !free_buf)
    {
    if (buf == curbuf)
        u_sync();        /* sync undo before going to another buffer */
    return;
    }

    /* Always remove the buffer when there is no file name. */
    if (buf->b_ffname == NULL)
    del_buf = TRUE;

    /*
     * Free all things allocated for this buffer.
     * Also calls the "BufDelete" autocommands when del_buf is TRUE.
     */
    buf_freeall(buf, del_buf);
    if (!buf_valid(buf))        /* autocommands may delete the buffer */
    return;

    /*
     * Remove the buffer from the list.
     */
    if (del_buf)
    {
    vim_free(buf->b_ffname);
    vim_free(buf->b_sfname);
    if (buf->b_prev == NULL)
        firstbuf = buf->b_next;
    else
        buf->b_prev->b_next = buf->b_next;
    if (buf->b_next == NULL)
        lastbuf = buf->b_prev;
    else
        buf->b_next->b_prev = buf->b_prev;
    free_buffer(buf);
    }
    else
    buf_clear(buf);
}

/*
 * buf_clear() - make buffer empty
 */
    void
buf_clear(buf)
    BUF        *buf;
{
    buf->b_ml.ml_line_count = 1;
    buf->b_changed = FALSE;
    buf->b_start_ffc = *buf->b_p_ff;
#ifndef SHORT_FNAME
    buf->b_shortname = FALSE;
#endif
    buf->b_p_eol = TRUE;
    buf->b_ml.ml_mfp = NULL;
    buf->b_ml.ml_flags = ML_EMPTY;        /* empty buffer */
}

/*
 * buf_freeall() - free all things allocated for the buffer
 */
    void
buf_freeall(buf, del_buf)
    BUF        *buf;
    int        del_buf;    /* buffer is going to be deleted */
{
#ifdef AUTOCMD
    apply_autocmds(EVENT_BUFUNLOAD, buf->b_fname, buf->b_fname, FALSE);
    if (!buf_valid(buf))        /* autocommands may delete the buffer */
    return;
    if (del_buf)
    {
    apply_autocmds(EVENT_BUFDELETE, buf->b_fname, buf->b_fname, FALSE);
    if (!buf_valid(buf))        /* autocommands may delete the buffer */
        return;
    }
#endif
    u_blockfree(buf);            /* free the memory allocated for undo */
    ml_close(buf, TRUE);        /* close and delete the memline/memfile */
    buf->b_ml.ml_line_count = 0;    /* no lines in buffer */
    u_clearall(buf);            /* reset all undo information */
#ifdef SYNTAX_HL
    syntax_clear(buf);            /* reset syntax info */
#endif
#ifdef WANT_EVAL
    var_clear(&buf->b_vars);        /* free all internal variables */
#endif
}

/*
 * Free a buffer structure and some of the things it contains.
 */
    static void
free_buffer(buf)
    BUF        *buf;
{
    WINLNUM    *wlp;

    /* Free the b_winlnum list for buffer "buf". */
    while (buf->b_winlnum != NULL)
    {
    wlp = buf->b_winlnum;
    buf->b_winlnum = wlp->wl_next;
    vim_free(wlp);
    }

#ifdef HAVE_PERL_INTERP
    perl_buf_free(buf);
#endif
#ifdef HAVE_PYTHON
    python_buffer_free(buf);
#endif

    free_buf_options(buf, TRUE);
    vim_free(buf);
}

/*
 * do_bufdel() - delete or unload buffer(s)
 *
 * addr_count == 0: ":bdel" - delete current buffer
 * addr_count == 1: ":N bdel" or ":bdel N [N ..] - first delete
 *            buffer "end_bnr", then any other arguments.
 * addr_count == 2: ":N,N bdel" - delete buffers in range
 *
 * command can be DOBUF_UNLOAD (":bunload") or DOBUF_DEL (":bdel")
 *
 * Returns error message or NULL
 */
    char_u *
do_bufdel(command, arg, addr_count, start_bnr, end_bnr, forceit)
    int        command;
    char_u  *arg;    /* pointer to extra arguments */
    int        addr_count;
    int        start_bnr;    /* first buffer number in a range */
    int        end_bnr;    /* buffer number or last buffer number in a range */
    int        forceit;
{
    int        do_current = 0;    /* delete current buffer? */
    int        deleted = 0;    /* number of buffers deleted */
    char_u  *errormsg = NULL;    /* return value */
    int        bnr;        /* buffer number */
    char_u  *p;

    if (addr_count == 0)
    (void)do_buffer(command, DOBUF_CURRENT, FORWARD, 0, forceit);
    else
    {
    if (addr_count == 2)
    {
        if (*arg)        /* both range and argument is not allowed */
        return e_trailing;
        bnr = start_bnr;
    }
    else    /* addr_count == 1 */
        bnr = end_bnr;

    for ( ;!got_int; ui_breakcheck())
    {
        /*
         * delete the current buffer last, otherwise when the
         * current buffer is deleted, the next buffer becomes
         * the current one and will be loaded, which may then
         * also be deleted, etc.
         */
        if (bnr == curbuf->b_fnum)
        do_current = bnr;
        else if (do_buffer(command, DOBUF_FIRST, FORWARD, (int)bnr,
                                   forceit) == OK)
        ++deleted;

        /*
         * find next buffer number to delete/unload
         */
        if (addr_count == 2)
        {
        if (++bnr > end_bnr)
            break;
        }
        else    /* addr_count == 1 */
        {
        arg = skipwhite(arg);
        if (*arg == NUL)
            break;
        if (!isdigit(*arg))
        {
            p = skiptowhite_esc(arg);
            bnr = buflist_findpat(arg, p);
            if (bnr < 0)        /* failed */
            break;
            arg = p;
        }
        else
            bnr = getdigits(&arg);
        }
    }
    if (!got_int && do_current && do_buffer(command, DOBUF_FIRST,
                      FORWARD, do_current, forceit) == OK)
        ++deleted;

    if (deleted == 0)
    {
        sprintf((char *)IObuff, "No buffers were %s",
            command == DOBUF_UNLOAD ? "unloaded" : "deleted");
        errormsg = IObuff;
    }
    else
        smsg((char_u *)"%d buffer%s %s", deleted,
            plural((long)deleted),
            command == DOBUF_UNLOAD ? "unloaded" : "deleted");
    }

    return errormsg;
}

/*
 * Implementation of the command for the buffer list
 *
 * action == DOBUF_GOTO        go to specified buffer
 * action == DOBUF_SPLIT    split window and go to specified buffer
 * action == DOBUF_UNLOAD   unload specified buffer(s)
 * action == DOBUF_DEL        delete specified buffer(s)
 *
 * start == DOBUF_CURRENT   go to "count" buffer from current buffer
 * start == DOBUF_FIRST        go to "count" buffer from first buffer
 * start == DOBUF_LAST        go to "count" buffer from last buffer
 * start == DOBUF_MOD        go to "count" modified buffer from current buffer
 *
 * Return FAIL or OK.
 */
    int
do_buffer(action, start, dir, count, forceit)
    int        action;
    int        start;
    int        dir;    /* FORWARD or BACKWARD */
    int        count;    /* buffer number or number of buffers */
    int        forceit;    /* TRUE for :...! */
{
    BUF        *buf;
    BUF        *delbuf;
    int        retval;
    int        forward;

    switch (start)
    {
    case DOBUF_FIRST:   buf = firstbuf; break;
    case DOBUF_LAST:    buf = lastbuf;  break;
    default:        buf = curbuf;   break;
    }
    if (start == DOBUF_MOD)        /* find next modified buffer */
    {
    while (count-- > 0)
    {
        do
        {
        buf = buf->b_next;
        if (buf == NULL)
            buf = firstbuf;
        }
        while (buf != curbuf && !buf_changed(buf));
    }
    if (!buf_changed(buf))
    {
        EMSG("No modified buffer found");
        return FAIL;
    }
    }
    else if (start == DOBUF_FIRST && count) /* find specified buffer number */
    {
    while (buf != NULL && buf->b_fnum != count)
        buf = buf->b_next;
    }
    else
    {
    while (count-- > 0)
    {
        if (dir == FORWARD)
        {
        buf = buf->b_next;
        if (buf == NULL)
            buf = firstbuf;
        }
        else
        {
        buf = buf->b_prev;
        if (buf == NULL)
            buf = lastbuf;
        }
    }
    }

    if (buf == NULL)        /* could not find it */
    {
    if (start == DOBUF_FIRST)
    {
                        /* don't warn when deleting */
        if (action != DOBUF_UNLOAD && action != DOBUF_DEL)
        EMSGN("Cannot go to buffer %ld", count);
    }
    else if (dir == FORWARD)
        EMSG("Cannot go beyond last buffer");
    else
        EMSG("Cannot go before first buffer");
    return FAIL;
    }

    /*
     * delete buffer buf from memory and/or the list
     */
    if (action == DOBUF_UNLOAD || action == DOBUF_DEL)
    {
    if (!forceit && buf_changed(buf))
    {
        EMSGN("No write since last change for buffer %ld (use ! to override)",
            buf->b_fnum);
        return FAIL;
    }

    /*
     * If deleting last buffer, make it empty.
     * The last buffer cannot be unloaded.
     */
    if (firstbuf->b_next == NULL)
    {
        if (action == DOBUF_UNLOAD)
        {
        EMSG("Cannot unload last buffer");
        return FAIL;
        }

        /* Close any other windows on this buffer, then make it empty. */
        close_others(FALSE, TRUE);
        buf = curbuf;
        setpcmark();
        retval = do_ecmd(0, NULL, NULL, NULL, (linenr_t)1,
                          forceit ? ECMD_FORCEIT : 0);

        /*
         * do_ecmd() may create a new buffer, then we have to delete
         * the old one.  But do_ecmd() may have done that already, check
         * if the buffer still exists.
         */
        if (buf != curbuf && buf_valid(buf))
        close_buffer(NULL, buf, TRUE, TRUE);
        return retval;
    }

    /*
     * If the deleted buffer is the current one, close the current window
     * (unless it's the only window).
     */
    while (buf == curbuf && firstwin != lastwin)
        close_window(curwin, FALSE);

    /*
     * If the buffer to be deleted is not current one, delete it here.
     */
    if (buf != curbuf)
    {
        close_windows(buf);
        if (buf_valid(buf))
        close_buffer(NULL, buf, TRUE, action == DOBUF_DEL);
        return OK;
    }

    /*
     * Deleting the current buffer: Need to find another buffer to go to.
     * There must be another, otherwise it would have been handled above.
     * First try to find one that is loaded, after the current buffer,
     * then before the current buffer.
     */
    forward = TRUE;
    buf = curbuf->b_next;
    for (;;)
    {
        if (buf == NULL)
        {
        if (!forward)    /* tried both directions */
            break;
        buf = curbuf->b_prev;
        forward = FALSE;
        continue;
        }
        if (buf->b_ml.ml_mfp != NULL)
        break;
        if (forward)
        buf = buf->b_next;
        else
        buf = buf->b_prev;
    }
    if (buf == NULL)    /* No loaded buffers, just take one */
    {
        if (curbuf->b_next != NULL)
        buf = curbuf->b_next;
        else
        buf = curbuf->b_prev;
    }
    }

    /*
     * make buf current buffer
     */
    if (action == DOBUF_SPLIT)        /* split window first */
    {
    if (win_split(0, FALSE, FALSE) == FAIL)
        return FAIL;
    }

    /* go to current buffer - nothing to do */
    if (buf == curbuf)
    return OK;

    /*
     * Check if the current buffer may be abandoned.
     */
    if (action == DOBUF_GOTO && !can_abandon(curbuf, forceit))
    {
    EMSG(e_nowrtmsg);
    return FAIL;
    }

    setpcmark();
    curwin->w_alt_fnum = curbuf->b_fnum; /* remember alternate file */
    buflist_altlnum();             /* remember curpos.lnum */

    /* close_windows() or apply_autocmds() may change curbuf */
    delbuf = curbuf;

#ifdef AUTOCMD
    apply_autocmds(EVENT_BUFLEAVE, NULL, NULL, FALSE);
    if (buf_valid(delbuf))
#endif
    {
    if (action == DOBUF_UNLOAD || action == DOBUF_DEL)
        close_windows(delbuf);
    if (buf_valid(delbuf))
        close_buffer(delbuf == curwin->w_buffer ? curwin : NULL, delbuf,
            (action == DOBUF_GOTO && !p_hid && !buf_changed(delbuf))
                 || action == DOBUF_UNLOAD || action == DOBUF_DEL,
              action == DOBUF_DEL);
    }
#ifdef AUTOCMD
    if (buf_valid(buf))        /* an autocommand may have deleted buf! */
#endif
    enter_buffer(buf);
    return OK;
}

/*
 * enter a new current buffer.
 * (old curbuf must have been freed already)
 */
    static void
enter_buffer(buf)
    BUF        *buf;
{
    buf_copy_options(curbuf, buf, BCO_ENTER | BCO_NOHELP);
    curwin->w_buffer = buf;
    curbuf = buf;
    ++curbuf->b_nwindows;
    if (curbuf->b_ml.ml_mfp == NULL)    /* need to load the file */
    open_buffer(FALSE);
    else
    {
    need_fileinfo = TRUE;        /* display file info after redraw */
    buf_check_timestamp(curbuf);    /* check if file has changed */
#ifdef AUTOCMD
    apply_autocmds(EVENT_BUFENTER, NULL, NULL, FALSE);
#endif
    }
    buflist_getlnum();            /* restore curpos.lnum */
    check_arg_idx();            /* check for valid arg_idx */
    maketitle();
    scroll_cursor_halfway(FALSE);    /* redisplay at correct position */
    update_screen(NOT_VALID);
}

/*
 * functions for dealing with the buffer list
 */

/*
 * Add a file name to the buffer list. Return a pointer to the buffer.
 * If the same file name already exists return a pointer to that buffer.
 * If it does not exist, or if fname == NULL, a new entry is created.
 * If use_curbuf is TRUE, may use current buffer.
 * This is the ONLY way to create a new buffer.
 */
static int  top_file_num = 1;        /* highest file number */

    BUF *
buflist_new(ffname, sfname, lnum, use_curbuf)
    char_u    *ffname;
    char_u    *sfname;
    linenr_t    lnum;
    int        use_curbuf;
{
    BUF        *buf;

    fname_expand(&ffname, &sfname);    /* will allocate ffname */

    /*
     * If file name already exists in the list, update the entry.
     */
    if (ffname != NULL && (buf = buflist_findname(ffname)) != NULL)
    {
    vim_free(ffname);
    if (lnum != 0)
        buflist_setlnum(buf, lnum, 0);
    /* copy the options now, if 'cpo' doesn't have 's' and not done
     * already */
    buf_copy_options(curbuf, buf, 0);
    return buf;
    }

    /*
     * If the current buffer has no name and no contents, use the current
     * buffer.    Otherwise: Need to allocate a new buffer structure.
     *
     * This is the ONLY place where a new buffer structure is allocated!
     */
    if (use_curbuf && curbuf != NULL && curbuf->b_ffname == NULL &&
        curbuf->b_nwindows <= 1 &&
        (curbuf->b_ml.ml_mfp == NULL || bufempty()))
    buf = curbuf;
    else
    {
    buf = (BUF *)alloc_clear((unsigned)sizeof(BUF));
    if (buf == NULL)
    {
        vim_free(ffname);
        return NULL;
    }
    }

    if (ffname != NULL)
    {
    buf->b_ffname = ffname;
    buf->b_sfname = vim_strsave(sfname);
    }
    if (buf->b_winlnum == NULL)
    buf->b_winlnum = (WINLNUM *)alloc((unsigned)sizeof(WINLNUM));
    if ((ffname != NULL && (buf->b_ffname == NULL ||
             buf->b_sfname == NULL)) || buf->b_winlnum == NULL)
    {
    vim_free(buf->b_ffname);
    buf->b_ffname = NULL;
    vim_free(buf->b_sfname);
    buf->b_sfname = NULL;
    if (buf != curbuf)
        free_buffer(buf);
    return NULL;
    }

    if (buf == curbuf)
    {
    buf_freeall(buf, FALSE); /* free all things allocated for this buffer */
    buf->b_nwindows = 0;
    }
    else
    {
    /*
     * put new buffer at the end of the buffer list
     */
    buf->b_next = NULL;
    if (firstbuf == NULL)        /* buffer list is empty */
    {
        buf->b_prev = NULL;
        firstbuf = buf;
    }
    else                /* append new buffer at end of list */
    {
        lastbuf->b_next = buf;
        buf->b_prev = lastbuf;
    }
    lastbuf = buf;

    buf->b_fnum = top_file_num++;
    if (top_file_num < 0)        /* wrap around (may cause duplicates) */
    {
        EMSG("Warning: List of file names overflow");
        ui_delay(3000L, TRUE);    /* make sure it is noticed */
        top_file_num = 1;
    }

    buf->b_winlnum->wl_lnum = lnum;
    buf->b_winlnum->wl_col = 0;
    buf->b_winlnum->wl_next = NULL;
    buf->b_winlnum->wl_prev = NULL;
    buf->b_winlnum->wl_win = curwin;

#ifdef WANT_EVAL
    var_init(&buf->b_vars);        /* init internal variables */
#endif
    /*
     * Always copy the options from the current buffer.
     */
    buf_copy_options(curbuf, buf, BCO_ALWAYS);
    }

    buf->b_fname = buf->b_sfname;
    buf->b_u_synced = TRUE;
    buf->b_flags |= BF_CHECK_RO | BF_NEVERLOADED;
    buf_clear(buf);
    clrallmarks(buf);            /* clear marks */
    fmarks_check_names(buf);        /* check file marks for this file */

    return buf;
}

/*
 * Get the highest buffer number.  Note that some buffers may have been
 * deleted.
 */
    int
buflist_maxbufnr()
{
    return (top_file_num - 1);
}

/*
 * Free the memory for the options of a buffer.
 */
    void
free_buf_options(buf, free_p_ff)
    BUF        *buf;
    int        free_p_ff;        /* also free 'fileformat'? */
{
    if (free_p_ff)
    free_string_option(buf->b_p_ff);
    free_string_option(buf->b_p_fo);
    free_string_option(buf->b_p_isk);
    free_string_option(buf->b_p_com);
    free_string_option(buf->b_p_nf);
#ifdef CINDENT
    free_string_option(buf->b_p_cink);
    free_string_option(buf->b_p_cino);
#endif
#if defined(CINDENT) || defined(SMARTINDENT)
    free_string_option(buf->b_p_cinw);
#endif
#ifdef INSERT_EXPAND
    free_string_option(buf->b_p_cpt);
#endif
}

/*
 * get alternate file n
 * set linenr to lnum or altlnum if lnum == 0
 * if (options & GETF_SETMARK) call setpcmark()
 * if (options & GETF_ALT) we are jumping to an alternate file.
 *
 * return FAIL for failure, OK for success
 */
    int
buflist_getfile(n, lnum, options, forceit)
    int        n;
    linenr_t    lnum;
    int        options;
    int        forceit;
{
    BUF        *buf;

    buf = buflist_findnr(n);
    if (buf == NULL)
    {
    if ((options & GETF_ALT) && n == 0)
        emsg(e_noalt);
    else
        EMSGN("buffer %ld not found", n);
    return FAIL;
    }

    /* if alternate file is the current buffer, nothing to do */
    if (buf == curbuf)
    return OK;

    /* altlnum may be changed by getfile(), get it now */
    if (lnum == 0)
    lnum = buflist_findlnum(buf);
    ++RedrawingDisabled;
    if (getfile(buf->b_fnum, NULL, NULL, (options & GETF_SETMARK),
                              lnum, forceit) <= 0)
    {
    --RedrawingDisabled;
    return OK;
    }
    --RedrawingDisabled;
    return FAIL;
}

/*
 * go to the last know line number for the current buffer
 */
    void
buflist_getlnum()
{
    WINLNUM    *wlp;

    curwin->w_cursor.lnum = 1;
    curwin->w_cursor.col = 0;
    wlp = buflist_findwlp(curbuf);
    if (wlp != NULL && wlp->wl_lnum != 0
                && wlp->wl_lnum <= curbuf->b_ml.ml_line_count)
    {
    curwin->w_cursor.lnum = wlp->wl_lnum;
    curwin->w_cursor.col = wlp->wl_col;
    adjust_cursor();
    }
}

/*
 * find file in buffer list by name (it has to be for the current window)
 * 'ffname' must have a full path.
 */
    BUF *
buflist_findname(ffname)
    char_u    *ffname;
{
    BUF        *buf;

    for (buf = firstbuf; buf != NULL; buf = buf->b_next)
    if (buf->b_ffname != NULL && fnamecmp(ffname, buf->b_ffname) == 0)
        return (buf);
    return NULL;
}

/*
 * Find file in buffer list by a regexppattern.
 * Return fnum of the found buffer, < 0 for error.
 */
    int
buflist_findpat(pattern, pattern_end)
    char_u    *pattern;
    char_u    *pattern_end;        /* pointer to first char after pattern */
{
    BUF        *buf;
    vim_regexp    *prog;
    int        fnum = -1;
    char_u    *pat;
    char_u    *match;
    int        attempt;
    char_u    *p;

    if (pattern_end == pattern + 1 && (*pattern == '%' || *pattern == '#'))
    {
    if (*pattern == '%')
        fnum = curbuf->b_fnum;
    else
        fnum = curwin->w_alt_fnum;
    }

    /*
     * Try four ways of matching:
     * attempt == 0: without '^' or '$' (at any position)
     * attempt == 1: with '^' at start (only at postion 0)
     * attempt == 2: with '$' at end (only match at end)
     * attempt == 3: with '^' at start and '$' at end (only full match)
     */
    else for (attempt = 0; attempt <= 3; ++attempt)
    {
    /* may add '^' and '$' */
    pat = file_pat_to_reg_pat(pattern, pattern_end, NULL);
    if (pat == NULL)
        return -1;
    if (attempt < 2)
    {
        p = pat + STRLEN(pat) - 1;
        if (p > pat && *p == '$')            /* remove '$' */
        *p = NUL;
    }
    p = pat;
    if (*p == '^' && !(attempt & 1))        /* remove '^' */
        ++p;
    prog = vim_regcomp(p, (int)p_magic);
    vim_free(pat);
    if (prog == NULL)
        return -1;

    for (buf = firstbuf; buf != NULL; buf = buf->b_next)
    {
        match = buflist_match(prog, buf);
        if (match != NULL)
        {
        if (fnum >= 0)        /* already found a match */
        {
            fnum = -2;
            break;
        }
        fnum = buf->b_fnum;    /* remember first match */
        }
    }
    vim_free(prog);
    if (fnum >= 0)            /* found one match */
        break;
    }

    if (fnum == -2)
    EMSG2("More than one match for %s", pattern);
    else if (fnum < 1)
    EMSG2("No matching buffer for %s", pattern);
    return fnum;
}

/*
 * Find all buffer names that match.
 * For command line expansion of ":buf" and ":sbuf".
 * Return OK if matches found, FAIL otherwise.
 */
    int
ExpandBufnames(pat, num_file, file, options)
    char_u    *pat;
    int        *num_file;
    char_u    ***file;
    int        options;
{
    int        count = 0;
    BUF        *buf;
    int        round;
    char_u    *p;
    int        attempt;
    vim_regexp    *prog;

    *num_file = 0;            /* return values in case of FAIL */
    *file = NULL;

    /*
     * attempt == 1: try match with    '^', match at start
     * attempt == 2: try match without '^', match anywhere
     */
    for (attempt = 1; attempt <= 2; ++attempt)
    {
    if (attempt == 2)
    {
        if (*pat != '^')        /* there's no '^', no need to try again */
        break;
        ++pat;            /* skip the '^' */
    }
    prog = vim_regcomp(pat, (int)p_magic);
    if (prog == NULL)
        return FAIL;

    /*
     * round == 1: Count the matches.
     * round == 2: Build the array to keep the matches.
     */
    for (round = 1; round <= 2; ++round)
    {
        count = 0;
        for (buf = firstbuf; buf != NULL; buf = buf->b_next)
        {
        p = buflist_match(prog, buf);
        if (p != NULL)
        {
            if (round == 1)
            ++count;
            else
            {
            if (options & WILD_HOME_REPLACE)
                p = home_replace_save(buf, p);
            else
                p = vim_strsave(p);
            (*file)[count++] = p;
            }
        }
        }
        if (count == 0)    /* no match found, break here */
        break;
        if (round == 1)
        {
        *file = (char_u **)alloc((unsigned)(count * sizeof(char_u *)));
        if (*file == NULL)
        {
            vim_free(prog);
            return FAIL;
        }
        }
    }
    vim_free(prog);
    if (count)        /* match(es) found, break here */
        break;
    }

    *num_file = count;
    return (count == 0 ? FAIL : OK);
}

/*
 * Check for a match on the file name for buffer "buf" with regex prog "prog".
 */
    static char_u *
buflist_match(prog, buf)
    vim_regexp    *prog;
    BUF        *buf;
{
    char_u  *match;
#ifdef CASE_INSENSITIVE_FILENAME
    int        save_reg_ic = reg_ic;

    reg_ic = TRUE;        /* Always ignore case */
#endif

    /* First try the short file name, then the long file name. */
    match = buflist_match_try(prog, buf->b_sfname);
    if (match == NULL)
    match = buflist_match_try(prog, buf->b_ffname);

#ifdef CASE_INSENSITIVE_FILENAME
    reg_ic = save_reg_ic;
#endif

    return match;
}

    static char_u *
buflist_match_try(prog, name)
    vim_regexp    *prog;
    char_u    *name;
{
    char_u  *match = NULL;
    char_u  *p;

    if (name != NULL)
    {
    if (vim_regexec(prog, name, TRUE) != 0)
        match = name;
    else
    {
        /* Replace $(HOME) with '~' and try matching again. */
        p = home_replace_save(NULL, name);
        if (p != NULL && vim_regexec(prog, p, TRUE) != 0)
        match = name;
        vim_free(p);
    }
    }
    return match;
}

/*
 * find file in buffer name list by number
 */
    BUF    *
buflist_findnr(nr)
    int        nr;
{
    BUF        *buf;

    if (nr == 0)
    nr = curwin->w_alt_fnum;
    for (buf = firstbuf; buf != NULL; buf = buf->b_next)
    if (buf->b_fnum == nr)
        return (buf);
    return NULL;
}

/*
 * Get name of file 'n' in the buffer list.
 * home_replace() is used to shorten the file name (used for marks).
 * Returns a pointer to allocated memory, of NULL when failed.
 */
    char_u *
buflist_nr2name(n, fullname, helptail)
    int n;
    int fullname;
    int helptail;        /* for help buffers return tail only */
{
    BUF        *buf;

    buf = buflist_findnr(n);
    if (buf == NULL)
    return NULL;
    return home_replace_save(helptail ? buf : NULL,
                     fullname ? buf->b_ffname : buf->b_fname);
}

/*
 * set the lnum for the buffer 'buf' and the current window
 */
    static void
buflist_setlnum(buf, lnum, col)
    BUF        *buf;
    linenr_t    lnum;
    colnr_t    col;
{
    WINLNUM    *wlp;

    for (wlp = buf->b_winlnum; wlp != NULL; wlp = wlp->wl_next)
    if (wlp->wl_win == curwin)
        break;
    if (wlp == NULL)        /* make new entry */
    {
    wlp = (WINLNUM *)alloc((unsigned)sizeof(WINLNUM));
    if (wlp == NULL)
        return;
    wlp->wl_win = curwin;
    }
    else            /* remove entry from list */
    {
    if (wlp->wl_prev)
        wlp->wl_prev->wl_next = wlp->wl_next;
    else
        buf->b_winlnum = wlp->wl_next;
    if (wlp->wl_next)
        wlp->wl_next->wl_prev = wlp->wl_prev;
    }
    wlp->wl_lnum = lnum;
    wlp->wl_col = col;

    /* insert entry in front of the list */
    wlp->wl_next = buf->b_winlnum;
    buf->b_winlnum = wlp;
    wlp->wl_prev = NULL;
    if (wlp->wl_next)
    wlp->wl_next->wl_prev = wlp;

    return;
}

/*
 * find the wlp for the buffer 'buf' for the current window
 */
    static WINLNUM *
buflist_findwlp(buf)
    BUF        *buf;
{
    WINLNUM    *wlp;

    for (wlp = buf->b_winlnum; wlp != NULL; wlp = wlp->wl_next)
    if (wlp->wl_win == curwin)
        break;

    if (wlp == NULL)    /* if no lnum for curwin, use the first in the list */
    wlp = buf->b_winlnum;

    return wlp;
}

/*
 * find the lnum for the buffer 'buf' for the current window
 */
    linenr_t
buflist_findlnum(buf)
    BUF        *buf;
{
    WINLNUM    *wlp;

    wlp = buflist_findwlp(buf);

    if (wlp != NULL)
    return wlp->wl_lnum;
    else
    return (linenr_t)1;
}

/*
 * list all know file names (for :files and :buffers command)
 */
    void
buflist_list()
{
    BUF        *buf;
    int        len;

    for (buf = firstbuf; buf != NULL && !got_int; buf = buf->b_next)
    {
    msg_putchar('\n');
    if (buf->b_fname == NULL)
        STRCPY(NameBuff, "No File");
    else
        home_replace(buf, buf->b_fname, NameBuff, MAXPATHL);

    sprintf((char *)IObuff, "%3d %c%c%c \"",
        buf->b_fnum,
        buf == curbuf ? '%' :
            (curwin->w_alt_fnum == buf->b_fnum ? '#' : ' '),
        buf->b_ml.ml_mfp == NULL ? '-' :
            (buf->b_nwindows == 0 ? 'h' : ' '),
        buf_changed(buf) ? '+' : ' ');

    len = STRLEN(IObuff);
    STRNCPY(IObuff + len, NameBuff, IOSIZE - 20 - len);

    len = STRLEN(IObuff);
    IObuff[len++] = '"';
    /*
     * try to put the "line" strings in column 40
     */
    do
    {
        IObuff[len++] = ' ';
    } while (len < 40 && len < IOSIZE - 18);
    sprintf((char *)IObuff + len, "line %ld",
        buf == curbuf ? curwin->w_cursor.lnum :
                (long)buflist_findlnum(buf));
    msg_outtrans(IObuff);
    out_flush();        /* output one line at a time */
    ui_breakcheck();
    }
}

/*
 * Get file name and line number for file 'fnum'.
 * Used by DoOneCmd() for translating '%' and '#'.
 * Used by insert_reg() and cmdline_paste() for '#' register.
 * Return FAIL if not found, OK for success.
 */
    int
buflist_name_nr(fnum, fname, lnum)
    int        fnum;
    char_u    **fname;
    linenr_t    *lnum;
{
    BUF        *buf;

    buf = buflist_findnr(fnum);
    if (buf == NULL || buf->b_fname == NULL)
    return FAIL;

    *fname = buf->b_fname;
    *lnum = buflist_findlnum(buf);

    return OK;
}

/*
 * Set the current file name to 'ffname', short file name to 'sfname'.
 * The file name with the full path is also remembered, for when :cd is used.
 * Returns FAIL for failure (file name already in use by other buffer)
 *    OK otherwise.
 */
    int
setfname(ffname, sfname, message)
    char_u *ffname, *sfname;
    int        message;
{
    BUF        *buf;

    if (ffname == NULL || *ffname == NUL)
    {
    vim_free(curbuf->b_ffname);
    vim_free(curbuf->b_sfname);
    curbuf->b_ffname = NULL;
    curbuf->b_sfname = NULL;
    }
    else
    {
    fname_expand(&ffname, &sfname);        /* will allocate ffname */
    if (ffname == NULL)            /* out of memory */
        return FAIL;

#ifdef USE_FNAME_CASE
# ifdef USE_LONG_FNAME
    if (USE_LONG_FNAME)
# endif
        fname_case(sfname);        /* set correct case for short file name */
#endif
    /*
     * if the file name is already used in another buffer:
     * - if the buffer is loaded, fail
     * - if the buffer is not loaded, delete it from the list
     */
    buf = buflist_findname(ffname);
    if (buf != NULL && buf != curbuf)
    {
        if (buf->b_ml.ml_mfp != NULL)    /* it's loaded, fail */
        {
        if (message)
            EMSG("Buffer with this name already exists");
        vim_free(ffname);
        return FAIL;
        }
        close_buffer(NULL, buf, TRUE, TRUE);    /* delete from the list */
    }
    sfname = vim_strsave(sfname);
    if (ffname == NULL || sfname == NULL)
    {
        vim_free(sfname);
        vim_free(ffname);
        return FAIL;
    }
    vim_free(curbuf->b_ffname);
    vim_free(curbuf->b_sfname);
    curbuf->b_ffname = ffname;
    curbuf->b_sfname = sfname;
    }
    curbuf->b_fname = curbuf->b_sfname;

#ifndef SHORT_FNAME
    curbuf->b_shortname = FALSE;
#endif
    /*
     * If the file name changed, also change the name of the swapfile
     */
    if (curbuf->b_ml.ml_mfp != NULL)
    ml_setname();

    check_arg_idx();        /* check file name for arg list */
    maketitle();        /* set window title */
    status_redraw_all();    /* status lines need to be redrawn */
    fmarks_check_names(curbuf);    /* check named file marks */
    ml_timestamp(curbuf);    /* reset timestamp */
    return OK;
}

/*
 * set alternate file name for current window
 *
 * Used by do_one_cmd(), do_write() and do_ecmd().
 */
    void
setaltfname(ffname, sfname, lnum)
    char_u    *ffname;
    char_u    *sfname;
    linenr_t    lnum;
{
    BUF        *buf;

    buf = buflist_new(ffname, sfname, lnum, FALSE);
    if (buf != NULL)
    curwin->w_alt_fnum = buf->b_fnum;
}

/*
 * Get alternate file name for current window.
 * Return NULL if there isn't any, and give error message.
 */
    char_u  *
getaltfname()
{
    char_u    *fname;
    linenr_t    dummy;

    if (buflist_name_nr(0, &fname, &dummy) == FAIL)
    {
    emsg(e_noalt);
    return NULL;
    }
    return fname;
}

/*
 * add a file name to the buflist and return its number
 *
 * used by qf_init(), main() and doarglist()
 */
    int
buflist_add(fname)
    char_u    *fname;
{
    BUF        *buf;

    buf = buflist_new(fname, NULL, (linenr_t)0, FALSE);
    if (buf != NULL)
    return buf->b_fnum;
    return 0;
}

/*
 * set alternate lnum for current window
 */
    void
buflist_altlnum()
{
    buflist_setlnum(curbuf, curwin->w_cursor.lnum, curwin->w_cursor.col);
}

/*
 * Return TRUE if 'fname' is not the same file as current file.
 * Fname must have a full path (expanded by mch_FullName).
 */
    int
otherfile(fname)
    char_u  *fname;
{                    /* no name is different */
    if (fname == NULL || *fname == NUL || curbuf->b_ffname == NULL)
    return TRUE;
    if (fnamecmp(fname, curbuf->b_ffname) == 0)
    return FALSE;
#ifdef UNIX
    {
    struct stat    st1, st2;

    /* Use stat() to check if the files are the same, even when the names
     * are different (possible with links) */
    if (       stat((char *)fname, &st1) >= 0
        && stat((char *)curbuf->b_ffname, &st2) >= 0
        && st1.st_dev == st2.st_dev
        && st1.st_ino == st2.st_ino)
        return FALSE;
    }
#endif
    return TRUE;
}

    void
fileinfo(fullname, shorthelp, dont_truncate)
    int fullname;
    int shorthelp;
    int    dont_truncate;
{
    char_u    *name;
    int        n;
    char_u    *p;
    char_u    *buffer;

    buffer = alloc(IOSIZE);
    if (buffer == NULL)
    return;

    if (fullname > 1)        /* 2 CTRL-G: include buffer number */
    {
    sprintf((char *)buffer, "buf %d: ", curbuf->b_fnum);
    p = buffer + STRLEN(buffer);
    }
    else
    p = buffer;

    *p++ = '"';
    if (curbuf->b_ffname == NULL)
    STRCPY(p, "No File");
    else
    {
    if (!fullname && curbuf->b_fname != NULL)
        name = curbuf->b_fname;
    else
        name = curbuf->b_ffname;
    home_replace(shorthelp ? curbuf : NULL, name, p,
                        (int)(IOSIZE - (p - buffer)));
    }

    sprintf((char *)buffer + STRLEN(buffer),
        "\"%s%s%s%s",
        curbuf_changed() ? (shortmess(SHM_MOD) ?
                        " [+]" : " [Modified]") : " ",
        curbuf->b_notedited ? "[Not edited]" : "",
        curbuf->b_p_ro ? (shortmess(SHM_RO) ? "[RO]" : "[readonly]") : "",
        (curbuf_changed() || curbuf->b_notedited || curbuf->b_p_ro) ?
                                    " " : "");
    n = (int)(((long)curwin->w_cursor.lnum * 100L) /
                        (long)curbuf->b_ml.ml_line_count);
    if (curbuf->b_ml.ml_flags & ML_EMPTY)
    {
    STRCPY(buffer + STRLEN(buffer), no_lines_msg);
    }
    else if (p_ru)
    {
    /* Current line and column are already on the screen -- webb */
    sprintf((char *)buffer + STRLEN(buffer),
        "%ld line%s --%d%%--",
        (long)curbuf->b_ml.ml_line_count,
        plural((long)curbuf->b_ml.ml_line_count),
        n);
    }
    else
    {
    sprintf((char *)buffer + STRLEN(buffer),
        "line %ld of %ld --%d%%-- col ",
        (long)curwin->w_cursor.lnum,
        (long)curbuf->b_ml.ml_line_count,
        n);
    validate_virtcol();
    col_print(buffer + STRLEN(buffer),
           (int)curwin->w_cursor.col + 1, (int)curwin->w_virtcol + 1);
    }

    (void)append_arg_number(buffer, !shortmess(SHM_FILE), IOSIZE);

    if (dont_truncate)
    msg(buffer);
    else
    msg_trunc(buffer);

    vim_free(buffer);
}

/*
 * Give some info about the position of the cursor (for "g CTRL-G").
 */
    void
cursor_pos_info()
{
    char_u    *p;
    char_u    buf1[20];
    char_u    buf2[20];
    linenr_t    lnum;
    long    char_count = 0;
    long    char_count_cursor = 0;
    int        eol_size;

    /*
     * Compute the length of the file in characters.
     */
    if (curbuf->b_ml.ml_flags & ML_EMPTY)
    {
    MSG(no_lines_msg);
    }
    else
    {
    if (get_fileformat(curbuf) == EOL_DOS)
        eol_size = 2;
    else
        eol_size = 1;
    for (lnum = 1; lnum <= curbuf->b_ml.ml_line_count; ++lnum)
    {
        if (lnum == curwin->w_cursor.lnum)
        char_count_cursor = char_count + curwin->w_cursor.col + 1;
        char_count += STRLEN(ml_get(lnum)) + eol_size;
    }
    if (!curbuf->b_p_eol && curbuf->b_p_bin)
        char_count -= eol_size;

    p = ml_get_curline();
    validate_virtcol();
    col_print(buf1, (int)curwin->w_cursor.col + 1,
                          (int)curwin->w_virtcol + 1);
    col_print(buf2, (int)STRLEN(p), linetabsize(p));

    sprintf((char *)IObuff, "Col %s of %s; Line %ld of %ld; Char %ld of %ld",
        (char *)buf1, (char *)buf2,
        (long)curwin->w_cursor.lnum, (long)curbuf->b_ml.ml_line_count,
        char_count_cursor, char_count);
    msg(IObuff);
    }
}

    void
col_print(buf, col, vcol)
    char_u  *buf;
    int        col;
    int        vcol;
{
    if (col == vcol)
    sprintf((char *)buf, "%d", col);
    else
    sprintf((char *)buf, "%d-%d", col, vcol);
}

/*
 * put file name in title bar of window and in icon title
 */

static char_u *lasttitle = NULL;
static char_u *lasticon = NULL;

    void
maketitle()
{
    char_u    *t_name;
    char_u    *i_name;
    int        maxlen;
    int        len;
    char_u    *buf = NULL;

    if (curbuf->b_ffname == NULL)
    {
    t_name = (char_u *)"VIM -";
    i_name = (char_u *)"No File";
    }
    else
    {
    buf = alloc(IOSIZE);
    if (buf == NULL)
        return;
    STRCPY(buf, "VIM - ");
    home_replace(curbuf, curbuf->b_ffname, buf + 6, IOSIZE - 6);
    append_arg_number(buf, FALSE, IOSIZE);
    if (p_titlelen > 0)
    {
        maxlen = p_titlelen * Columns / 100;
        if (maxlen < 10)
        maxlen = 10;
        len = STRLEN(buf);
        if (len > maxlen)
        {
        vim_memmove(buf + 6, buf + 6 + len - maxlen,
                              (size_t)maxlen - 5);
        buf[5] = '<';
        }
    }
    t_name = buf;
    i_name = gettail(curbuf->b_ffname); /* use file name only for icon */
    }

    if (*p_titlestring)
    t_name = p_titlestring;
    if (*p_iconstring)
    i_name = p_iconstring;

    vim_free(lasttitle);
    if (p_title && (lasttitle = alloc((unsigned)(vim_strsize(t_name) + 1)))
                                      != NULL)
    {
    *lasttitle = NUL;
    while (*t_name)
        STRCAT(lasttitle, transchar(*t_name++));
    }
    else
    lasttitle = NULL;
    vim_free(buf);

    vim_free(lasticon);
    if (p_icon && (lasticon = alloc((unsigned)(vim_strsize(i_name) + 1)))
                                      != NULL)
    {
    *lasticon = NUL;
    while (*i_name)
        STRCAT(lasticon, transchar(*i_name++));
    }
    else
    lasticon = NULL;

    resettitle();
}

/*
 * Append (file 2 of 8) to 'buf', if editing more than one file.
 * Return TRUE if it was appended.
 */
    static int
append_arg_number(buf, add_file, maxlen)
    char_u  *buf;
    int        add_file;        /* Add "file" before the arg number */
    int        maxlen;        /* maximum nr of chars in buf */
{
    char_u    *p;

    if (arg_file_count <= 1)        /* nothing to do */
    return FALSE;

    p = buf + STRLEN(buf);    /* go to the end of the buffer */
    if (p - buf + 35 >= maxlen)    /* getting too long */
    return FALSE;
    *p++ = ' ';
    *p++ = '(';
    if (add_file)
    {
    STRCPY(p, "file ");
    p += 5;
    }
    sprintf((char *)p, curwin->w_arg_idx_invalid ? "(%d) of %d)" :
              "%d of %d)", curwin->w_arg_idx + 1, arg_file_count);
    return TRUE;
}

/*
 * Put current window title back (used after calling a shell)
 */
    void
resettitle()
{
    mch_settitle(lasttitle, lasticon);
}

/*
 * If fname is not a full path, make it a full path.
 * Returns pointer to allocated memory (NULL for failure).
 */
    char_u  *
fix_fname(fname)
    char_u  *fname;
{
    /*
     * Force expanding the path always for Unix, because symbolic links may
     * mess up the full path name, even though it starts with a '/'.
     */
#ifdef UNIX
    return FullName_save(fname, TRUE);
#else
    if (!mch_isFullName(fname))
    return FullName_save(fname, FALSE);

    fname = vim_strsave(fname);

#ifdef USE_FNAME_CASE
# ifdef USE_LONG_FNAME
    if (USE_LONG_FNAME)
# endif
    {
    if (fname != NULL)
        fname_case(fname);        /* set correct case for file name */
    }
#endif

    return fname;
#endif
}

/*
 * make ffname a full file name, set sfname to ffname if not NULL
 * ffname becomes a pointer to allocated memory (or NULL).
 */
    void
fname_expand(ffname, sfname)
    char_u    **ffname;
    char_u    **sfname;
{
    if (*ffname == NULL)    /* if no file name given, nothing to do */
    return;
    if (*sfname == NULL)    /* if no short file name given, use ffname */
    *sfname = *ffname;
    *ffname = fix_fname(*ffname);   /* expand to full path */
}

/*
 * do_arg_all(): Open up to 'count' windows, one for each argument.
 */
    void
do_arg_all(count, forceit)
    int    count;
    int    forceit;        /* hide buffers in current windows */
{
    int        i;
    WIN        *wp, *wpnext;
    char_u    *opened;    /* array of flags for which args are open */
    int        opened_len;    /* lenght of opened[] */
    int        use_firstwin = FALSE;    /* use first window for arglist */
    int        split_ret = OK;
    int        p_sb_save;
    int        p_ea_save;

    if (arg_file_count <= 0)
    {
    /* Don't give an error message.  We don't want it when the ":all"
     * command is in the .vimrc. */
    return;
    }
    setpcmark();

    opened_len = arg_file_count;
    opened = alloc_clear((unsigned)opened_len);
    if (opened == NULL)
    return;

    /*
     * Try closing all windows that are not in the argument list.
     * When 'hidden' or "forceit" set the buffer becomes hidden.
     * Windows that have a changed buffer and can't be hidden won't be closed.
     */
    for (wp = firstwin; wp != NULL; wp = wpnext)
    {
    wpnext = wp->w_next;
    if (wp->w_buffer->b_ffname == NULL || wp->w_buffer->b_nwindows > 1)
        i = arg_file_count;
    else
    {
        /* check if the buffer in this window is in the arglist */
        for (i = 0; i < arg_file_count; ++i)
        {
        if (fullpathcmp(arg_files[i],
                     wp->w_buffer->b_ffname, TRUE) & FPC_SAME)
        {
            if (i < opened_len)
            opened[i] = TRUE;
            break;
        }
        }
    }
    wp->w_arg_idx = i;

    if (i == arg_file_count)        /* close this window */
    {
        if (p_hid || forceit || wp->w_buffer->b_nwindows > 1
                        || !buf_changed(wp->w_buffer))
        {
        /* If the buffer was changed, and we would like to hide it,
         * try autowriting. */
        if (!p_hid && wp->w_buffer->b_nwindows <= 1
                         && buf_changed(wp->w_buffer))
        {
            autowrite(wp->w_buffer, FALSE);
#ifdef AUTOCMD
            /* check if autocommands removed the window */
            if (!win_valid(wp))
            {
            wpnext = firstwin;    /* start all over... */
            continue;
            }
#endif
        }
        if (firstwin == lastwin)    /* can't close last window */
            use_firstwin = TRUE;
        else
        {
            close_window(wp, !p_hid && !buf_changed(wp->w_buffer));
#ifdef AUTOCMD
            /* check if autocommands removed the next window */
            if (!win_valid(wpnext))
            wpnext = firstwin;    /* start all over... */
#endif
        }
        }
    }
    }

    /*
     * Open a window for files in the argument list that don't have one.
     * arg_file_count may change while doing this, because of autocommands.
     */
    if (count > arg_file_count || count <= 0)
    count = arg_file_count;

#ifdef AUTOCMD
    /* Don't execute Win/Buf Enter/Leave autocommands here. */
    ++autocmd_no_enter;
    ++autocmd_no_leave;
#endif
    win_enter(lastwin, FALSE);
    for (i = 0; i < count && i < arg_file_count && !got_int; ++i)
    {
    if (i == arg_file_count - 1)
        arg_had_last = TRUE;
    if (i < opened_len && opened[i])
    {
        /* Move the already present window to below the current window */
        if (curwin->w_arg_idx != i)
        {
        for (wpnext = firstwin; wpnext != NULL; wpnext = wpnext->w_next)
        {
            if (wpnext->w_arg_idx == i)
            {
            win_move_after(wpnext, curwin);
            break;
            }
        }
        }
    }
    else if (split_ret == OK)
    {
        if (!use_firstwin)        /* split current window */
        {
        p_sb_save = p_sb;
        p_ea_save = p_ea;
        p_sb = TRUE;        /* put windows in order of arglist */
        p_ea = TRUE;        /* use space from all windows */
        split_ret = win_split(0, FALSE, TRUE);
        p_sb = p_sb_save;
        p_ea = p_ea_save;
        if (split_ret == FAIL)
            continue;
        }
#ifdef AUTOCMD
        else    /* first window: do autocmd for leaving this buffer */
        --autocmd_no_leave;
#endif

        curwin->w_arg_idx = i;
        /* edit file i */
        (void)do_ecmd(0, arg_files[i], NULL, NULL, (linenr_t)1,
           ((p_hid || buf_changed(curwin->w_buffer)) ? ECMD_HIDE : 0)
                                   + ECMD_OLDBUF);
#ifdef AUTOCMD
        if (use_firstwin)
        ++autocmd_no_leave;
#endif
        use_firstwin = FALSE;
    }
    ui_breakcheck();
    }
#ifdef AUTOCMD
    --autocmd_no_enter;
#endif
    win_enter(firstwin, FALSE);            /* back to first window */
#ifdef AUTOCMD
    --autocmd_no_leave;
#endif
}

/*
 * do_buffer_all: Open a window for each buffer.
 *
 * 'count' is the maximum number of windows to open.
 * When 'all' is TRUE, also load inactive buffers.
 */
    void
do_buffer_all(count, all)
    int        count;
    int        all;
{
    BUF        *buf;
    WIN        *wp, *wpnext;
    int        split_ret = OK;
    int        p_sb_save;
    int        p_ea_save;
    int        open_wins = 0;

    setpcmark();

    /*
     * Close superfluous windows (two windows for the same buffer).
     */
    for (wp = firstwin; wp != NULL; wp = wpnext)
    {
    wpnext = wp->w_next;
    if (wp->w_buffer->b_nwindows > 1)
    {
        close_window(wp, FALSE);
#ifdef AUTOCMD
        wpnext = firstwin;        /* just in case an autocommand does
                       something strange with windows */
        open_wins = 0;
#endif
    }
    else
        ++open_wins;
    }

    /*
     * Go through the buffer list.  When a buffer doesn't have a window yet,
     * open one.  Otherwise move the window to the right position.
     * Watch out for autocommands that delete buffers or windows!
     */
#ifdef AUTOCMD
    /* Don't execute Win/Buf Enter/Leave autocommands here. */
    ++autocmd_no_enter;
#endif
    win_enter(lastwin, FALSE);
#ifdef AUTOCMD
    ++autocmd_no_leave;
#endif
    for (buf = firstbuf; buf != NULL && open_wins < count; buf = buf->b_next)
    {
    /* Check if this buffer needs a window */
    if (!all && buf->b_ml.ml_mfp == NULL)
        continue;

    /* Check if this buffer already has a window */
    for (wp = firstwin; wp != NULL; wp = wp->w_next)
        if (wp->w_buffer == buf)
        break;
    /* If the buffer already has a window, move it */
    if (wp != NULL)
        win_move_after(wp, curwin);
    else if (split_ret == OK)
    {
        /* Split the window and put the buffer in it */
        p_sb_save = p_sb;
        p_ea_save = p_ea;
        p_sb = TRUE;        /* put windows in order of arglist */
        p_ea = TRUE;        /* use space from all windows */
        split_ret = win_split(0, FALSE, TRUE);
        ++open_wins;
        p_sb = p_sb_save;
        p_ea = p_ea_save;
        if (split_ret == FAIL)
        continue;
        (void)do_buffer(DOBUF_GOTO, DOBUF_FIRST, FORWARD,
                             (int)buf->b_fnum, 0);
#ifdef AUTOCMD
        if (!buf_valid(buf))    /* autocommands deleted the buffer!!! */
        break;
#endif
    }

    ui_breakcheck();
    if (got_int)
    {
        (void)vgetc();    /* only break the file loading, not the rest */
        break;
    }
    }
#ifdef AUTOCMD
    --autocmd_no_enter;
#endif
    win_enter(firstwin, FALSE);            /* back to first window */
#ifdef AUTOCMD
    --autocmd_no_leave;
#endif

    /*
     * Close superfluous windows.
     */
    for (wp = lastwin; open_wins > count; )
    {
    if (p_hid || !buf_changed(wp->w_buffer)
                      || autowrite(wp->w_buffer, FALSE) == OK)
    {
        close_window(wp, !p_hid);
        --open_wins;
        wp = lastwin;
    }
    else
    {
        wp = wp->w_prev;
        if (wp == NULL)
        break;
    }
    }
}

/*
 * do_modelines() - process mode lines for the current file
 *
 * Returns immediately if the "ml" option isn't set.
 */
static int  chk_modeline __ARGS((linenr_t));

    void
do_modelines()
{
    linenr_t        lnum;
    int            nmlines;

    if (!curbuf->b_p_ml || (nmlines = (int)p_mls) == 0)
    return;

    for (lnum = 1; lnum <= curbuf->b_ml.ml_line_count && lnum <= nmlines;
                                       ++lnum)
    if (chk_modeline(lnum) == FAIL)
        nmlines = 0;

    for (lnum = curbuf->b_ml.ml_line_count; lnum > 0 && lnum > nmlines &&
              lnum > curbuf->b_ml.ml_line_count - nmlines; --lnum)
    if (chk_modeline(lnum) == FAIL)
        nmlines = 0;
}

/*
 * chk_modeline() - check a single line for a mode string
 * Return FAIL if an error encountered.
 */
    static int
chk_modeline(lnum)
    linenr_t lnum;
{
    char_u        *s;
    char_u        *e;
    char_u        *linecopy;        /* local copy of any modeline found */
    int            prev;
    int            end;
    int            retval = OK;
    char_u        *save_sourcing_name;

    prev = -1;
    for (s = ml_get(lnum); *s != NUL; ++s)
    {
    if (prev == -1 || vim_isspace(prev))
    {
        if ((prev != -1 && STRNCMP(s, "ex:", (size_t)3) == 0) ||
                   STRNCMP(s, "vi:", (size_t)3) == 0 ||
                   STRNCMP(s, "vim:", (size_t)4) == 0)
        break;
    }
    prev = *s;
    }

    if (*s)
    {
    do                /* skip over "ex:", "vi:" or "vim:" */
        ++s;
    while (s[-1] != ':');

    s = linecopy = vim_strsave(s);    /* copy the line, it will change */
    if (linecopy == NULL)
        return FAIL;

    sourcing_lnum = lnum;        /* prepare for emsg() */
    save_sourcing_name = sourcing_name;
    sourcing_name = (char_u *)"modelines";

    end = FALSE;
    while (end == FALSE)
    {
        s = skipwhite(s);
        if (*s == NUL)
        break;

        /*
         * Find end of set command: ':' or end of line.
         */
        for (e = s; (*e != ':' || *(e - 1) == '\\') && *e != NUL; ++e)
        ;
        if (*e == NUL)
        end = TRUE;

        /*
         * If there is a "set" command, require a terminating ':' and
         * ignore the stuff after the ':'.
         * "vi:set opt opt opt: foo" -- foo not interpreted
         * "vi:opt opt opt: foo" -- foo interpreted
         */
        if (STRNCMP(s, "set ", (size_t)4) == 0)
        {
        if (*e != ':')        /* no terminating ':'? */
            break;
        end = TRUE;
        s += 4;
        }

        *e = NUL;            /* truncate the set command */
        if (do_set(s) == FAIL)    /* stop if error found */
        {
        retval = FAIL;
        break;
        }
        s = e + 1;            /* advance to next part */
    }

    sourcing_lnum = 0;
    sourcing_name = save_sourcing_name;

    vim_free(linecopy);
    }
    return retval;
}

#ifdef VIMINFO
    int
read_viminfo_bufferlist(line, fp, writing)
    char_u    *line;
    FILE    *fp;
    int        writing;
{
    char_u    *tab;
    linenr_t    lnum;
    colnr_t    col;
    BUF        *buf;
    char_u    *sfname;

    /* don't read in if there are files on the command-line or if writing: */
    if (!writing && arg_file_count == 0 && find_viminfo_parameter('%') != NULL)
    {
    tab = vim_strchr(line + 1, '\t');
    lnum = 0;
    col = 0;
    if (tab != NULL)
    {
        *tab++ = '\0';
        lnum = atol((char *)tab);
        tab = vim_strchr(tab, '\t');
        if (tab != NULL)
        col = atoi((char *)tab + 1);
    }

    /* Expand "~/" in the file name at "line + 1" to a full path.
     * Then try shortening it by comparing with the current directory */
    expand_env(line + 1, NameBuff, MAXPATHL);
    mch_dirname(IObuff, IOSIZE);
    sfname = shorten_fname(NameBuff, IObuff);
    if (sfname == NULL)
        sfname = NameBuff;

    buf = buflist_new(NameBuff, sfname, (linenr_t)0, FALSE);
    if (buf != NULL)    /* just in case... */
    {
        buf->b_last_cursor.lnum = lnum;
        buf->b_last_cursor.col = col;
        buflist_setlnum(buf, lnum, col);
    }
    }

    return vim_fgets(line, LSIZE, fp);
}

    void
write_viminfo_bufferlist(fp)
    FILE    *fp;
{
    BUF        *buf;
    WIN        *win;

    if (find_viminfo_parameter('%') == NULL)
    return;

    for (win = firstwin; win != NULL; win = win->w_next)
    set_last_cursor(win);

    fprintf(fp, "\n# Buffer list:\n");
    for (buf = firstbuf; buf != NULL ; buf = buf->b_next)
    {
    if (buf->b_fname == NULL || buf->b_help || removable(buf->b_ffname))
        continue;

    home_replace(NULL, buf->b_ffname, NameBuff, MAXPATHL);

    fprintf(fp, "%%%s\t%ld\t%d\n", NameBuff,
            (long)buf->b_last_cursor.lnum,
            buf->b_last_cursor.col);
    }
}
#endif