prompt.c

/*      $NetBSD: prompt.c,v 1.20 2011/07/29 15:16:33 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[] = "@(#)prompt.c    8.1 (Berkeley) 6/4/93";
#else
#endif
#endif /* not lint && not SCCSID */

/*
 * prompt.c: Prompt printing functions
 */
#include <stdio.h>
#include "el.h"

private Char    *prompt_default(EditLine *);
private Char    *prompt_default_r(EditLine *);

/* prompt_default():
 *      Just a default prompt, in case the user did not provide one
 */
private Char *
/*ARGSUSED*/
prompt_default(EditLine *el __attribute__((__unused__)))
{
        static Char a[3] = {'?', ' ', '\0'};

        return a;
}


/* prompt_default_r():
 *      Just a default rprompt, in case the user did not provide one
 */
private Char *
/*ARGSUSED*/
prompt_default_r(EditLine *el __attribute__((__unused__)))
{
        static Char a[1] = {'\0'};

        return a;
}


/* prompt_print():
 *      Print the prompt and update the prompt position.
 */
protected void
prompt_print(EditLine *el, int op)
{
        el_prompt_t *elp;
        Char *p;
        int ignore = 0;

        if (op == EL_PROMPT)
                elp = &el->el_prompt;
        else
                elp = &el->el_rprompt;

        if (elp->p_wide)
                p = (*elp->p_func)(el);
        else
                p = ct_decode_string((char *)(void *)(*elp->p_func)(el),
                    &el->el_scratch);

        for (; *p; p++) {
                if (elp->p_ignore == *p) {
                        ignore = !ignore;
                        continue;
                }
                if (ignore)
                        terminal__putc(el, *p);
                else
                        re_putc(el, *p, 1);
        }

        elp->p_pos.v = el->el_refresh.r_cursor.v;
        elp->p_pos.h = el->el_refresh.r_cursor.h;
}


/* prompt_init():
 *      Initialize the prompt stuff
 */
protected int
prompt_init(EditLine *el)
{

        el->el_prompt.p_func = prompt_default;
        el->el_prompt.p_pos.v = 0;
        el->el_prompt.p_pos.h = 0;
        el->el_prompt.p_ignore = '\0';
        el->el_rprompt.p_func = prompt_default_r;
        el->el_rprompt.p_pos.v = 0;
        el->el_rprompt.p_pos.h = 0;
        el->el_rprompt.p_ignore = '\0';
        return 0;
}


/* prompt_end():
 *      Clean up the prompt stuff
 */
protected void
/*ARGSUSED*/
prompt_end(EditLine *el __attribute__((__unused__)))
{
}


/* prompt_set():
 *      Install a prompt printing function
 */
protected int
prompt_set(EditLine *el, el_pfunc_t prf, Char c, int op, int wide)
{
        el_prompt_t *p;

        if (op == EL_PROMPT || op == EL_PROMPT_ESC)
                p = &el->el_prompt;
        else
                p = &el->el_rprompt;

        if (prf == NULL) {
                if (op == EL_PROMPT || op == EL_PROMPT_ESC)
                        p->p_func = prompt_default;
                else
                        p->p_func = prompt_default_r;
        } else {
                p->p_func = prf;
        }

        p->p_ignore = c;

        p->p_pos.v = 0;
        p->p_pos.h = 0;
        p->p_wide = wide;

        return 0;
}


/* prompt_get():
 *      Retrieve the prompt printing function
 */
protected int
prompt_get(EditLine *el, el_pfunc_t *prf, Char *c, int op)
{
        el_prompt_t *p;

        if (prf == NULL)
                return -1;

        if (op == EL_PROMPT)
                p = &el->el_prompt;
        else
                p = &el->el_rprompt;

        if (prf)
                *prf = p->p_func;
        if (c)
                *c = p->p_ignore;

        return 0;
}