/*      $OpenBSD: v_util.c,v 1.8 2016/01/06 22:28:52 millert Exp $      */

/*-
 * Copyright (c) 1992, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1992, 1993, 1994, 1995, 1996
 *      Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>

#include <bitstring.h>
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "../common/common.h"
#include "vi.h"

/*
 * v_eof --
 *      Vi end-of-file error.
 *
 * PUBLIC: void v_eof(SCR *, MARK *);
 */
void
v_eof(SCR *sp, MARK *mp)
{
        recno_t lno;

        if (mp == NULL)
                v_emsg(sp, NULL, VIM_EOF);
        else {
                if (db_last(sp, &lno))
                        return;
                if (mp->lno >= lno)
                        v_emsg(sp, NULL, VIM_EOF);
                else
                        msgq(sp, M_BERR, "Movement past the end-of-file");
        }
}

/*
 * v_eol --
 *      Vi end-of-line error.
 *
 * PUBLIC: void v_eol(SCR *, MARK *);
 */
void
v_eol(SCR *sp, MARK *mp)
{
        size_t len;

        if (mp == NULL)
                v_emsg(sp, NULL, VIM_EOL);
        else {
                if (db_get(sp, mp->lno, DBG_FATAL, NULL, &len))
                        return;
                if (mp->cno == len - 1)
                        v_emsg(sp, NULL, VIM_EOL);
                else
                        msgq(sp, M_BERR, "Movement past the end-of-line");
        }
}

/*
 * v_nomove --
 *      Vi no cursor movement error.
 *
 * PUBLIC: void v_nomove(SCR *);
 */
void
v_nomove(SCR *sp)
{
        msgq(sp, M_BERR, "No cursor movement made");
}

/*
 * v_sof --
 *      Vi start-of-file error.
 *
 * PUBLIC: void v_sof(SCR *, MARK *);
 */
void
v_sof(SCR *sp, MARK *mp)
{
        if (mp == NULL || mp->lno == 1)
                msgq(sp, M_BERR, "Already at the beginning of the file");
        else
                msgq(sp, M_BERR, "Movement past the beginning of the file");
}

/*
 * v_sol --
 *      Vi start-of-line error.
 *
 * PUBLIC: void v_sol(SCR *);
 */
void
v_sol(SCR *sp)
{
        msgq(sp, M_BERR, "Already in the first column");
}

/*
 * v_isempty --
 *      Return if the line contains nothing but white-space characters.
 *
 * PUBLIC: int v_isempty(char *, size_t);
 */
int
v_isempty(char *p, size_t len)
{
        for (; len--; ++p)
                if (!isblank(*p))
                        return (0);
        return (1);
}

/*
 * v_emsg --
 *      Display a few common vi messages.
 *
 * PUBLIC: void v_emsg(SCR *, char *, vim_t);
 */
void
v_emsg(SCR *sp, char *p, vim_t which)
{
        switch (which) {
        case VIM_COMBUF:
                msgq(sp, M_ERR,
                    "Buffers should be specified before the command");
                break;
        case VIM_EMPTY:
                msgq(sp, M_BERR, "The file is empty");
                break;
        case VIM_EOF:
                msgq(sp, M_BERR, "Already at end-of-file");
                break;
        case VIM_EOL:
                msgq(sp, M_BERR, "Already at end-of-line");
                break;
        case VIM_NOCOM:
        case VIM_NOCOM_B:
                msgq(sp,
                    which == VIM_NOCOM_B ? M_BERR : M_ERR,
                    "%s isn't a vi command", p);
                break;
        case VIM_WRESIZE:
                msgq(sp, M_ERR, "Window resize interrupted text input mode");
                break;
        case VIM_USAGE:
                msgq(sp, M_ERR, "Usage: %s", p);
                break;
        }
}