prompt.c

早期freebsd实现

/*-
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#if !defined(lint) && !defined(SCCSID)
static char sccsid[] = "@(#)prompt.c	8.1 (Berkeley) 6/4/93";
#endif /* not lint && not SCCSID */

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

private char *prompt_default	__P((EditLine *));

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


/* prompt_print():
 *	Print the prompt and update the prompt position.
 *	We use an array of integers in case we want to pass
 * 	literal escape sequences in the prompt and we want a
 *	bit to flag them
 */
protected void
prompt_print(el)
    EditLine *el;
{
    char *p = (*el->el_prompt.p_func)(el);
    while (*p)
	re_putc(el, *p++);

    el->el_prompt.p_pos.v = el->el_refresh.r_cursor.v;
    el->el_prompt.p_pos.h = el->el_refresh.r_cursor.h;

} /* end prompt_print */


/* prompt_init():
 *	Initialize the prompt stuff
 */
protected int 
prompt_init(el)
    EditLine *el;
{
    el->el_prompt.p_func = prompt_default;
    el->el_prompt.p_pos.v = 0;
    el->el_prompt.p_pos.h = 0;
    return 0;
} /* end prompt_init */


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


/* prompt_set():
 *	Install a prompt printing function
 */
protected int 
prompt_set(el, prf)
    EditLine *el;
    el_pfunc_t prf;
{
    if (prf == NULL)
	el->el_prompt.p_func = prompt_default;
    else
	el->el_prompt.p_func = prf;
    el->el_prompt.p_pos.v = 0;
    el->el_prompt.p_pos.h = 0;
    return 0;
} /* end prompt_set */