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prompt.c revision 1.9 
      1 /*	$NetBSD: prompt.c,v 1.9 2002/03/18 16:00:56 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Christos Zoulas of Cornell University.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include "config.h"
     40 #if !defined(lint) && !defined(SCCSID)
     41 #if 0
     42 static char sccsid[] = "@(#)prompt.c	8.1 (Berkeley) 6/4/93";
     43 #else
     44 __RCSID("$NetBSD: prompt.c,v 1.9 2002/03/18 16:00:56 christos Exp $");
     45 #endif
     46 #endif /* not lint && not SCCSID */
     47 
     48 /*
     49  * prompt.c: Prompt printing functions
     50  */
     51 #include <stdio.h>
     52 #include "el.h"
     53 
     54 private char	*prompt_default(EditLine *);
     55 private char	*prompt_default_r(EditLine *);
     56 
     57 /* prompt_default():
     58  *	Just a default prompt, in case the user did not provide one
     59  */
     60 private char *
     61 /*ARGSUSED*/
     62 prompt_default(EditLine *el)
     63 {
     64 	static char a[3] = {'?', ' ', '\0'};
     65 
     66 	return (a);
     67 }
     68 
     69 
     70 /* prompt_default_r():
     71  *	Just a default rprompt, in case the user did not provide one
     72  */
     73 private char *
     74 /*ARGSUSED*/
     75 prompt_default_r(EditLine *el)
     76 {
     77 	static char a[1] = {'\0'};
     78 
     79 	return (a);
     80 }
     81 
     82 
     83 /* prompt_print():
     84  *	Print the prompt and update the prompt position.
     85  *	We use an array of integers in case we want to pass
     86  * 	literal escape sequences in the prompt and we want a
     87  *	bit to flag them
     88  */
     89 protected void
     90 prompt_print(EditLine *el, int op)
     91 {
     92 	el_prompt_t *elp;
     93 	char *p;
     94 
     95 	if (op == EL_PROMPT)
     96 		elp = &el->el_prompt;
     97 	else
     98 		elp = &el->el_rprompt;
     99 	p = (elp->p_func) (el);
    100 	while (*p)
    101 		re_putc(el, *p++, 1);
    102 
    103 	elp->p_pos.v = el->el_refresh.r_cursor.v;
    104 	elp->p_pos.h = el->el_refresh.r_cursor.h;
    105 }
    106 
    107 
    108 /* prompt_init():
    109  *	Initialize the prompt stuff
    110  */
    111 protected int
    112 prompt_init(EditLine *el)
    113 {
    114 
    115 	el->el_prompt.p_func = prompt_default;
    116 	el->el_prompt.p_pos.v = 0;
    117 	el->el_prompt.p_pos.h = 0;
    118 	el->el_rprompt.p_func = prompt_default_r;
    119 	el->el_rprompt.p_pos.v = 0;
    120 	el->el_rprompt.p_pos.h = 0;
    121 	return (0);
    122 }
    123 
    124 
    125 /* prompt_end():
    126  *	Clean up the prompt stuff
    127  */
    128 protected void
    129 /*ARGSUSED*/
    130 prompt_end(EditLine *el)
    131 {
    132 }
    133 
    134 
    135 /* prompt_set():
    136  *	Install a prompt printing function
    137  */
    138 protected int
    139 prompt_set(EditLine *el, el_pfunc_t prf, int op)
    140 {
    141 	el_prompt_t *p;
    142 
    143 	if (op == EL_PROMPT)
    144 		p = &el->el_prompt;
    145 	else
    146 		p = &el->el_rprompt;
    147 	if (prf == NULL) {
    148 		if (op == EL_PROMPT)
    149 			p->p_func = prompt_default;
    150 		else
    151 			p->p_func = prompt_default_r;
    152 	} else
    153 		p->p_func = prf;
    154 	p->p_pos.v = 0;
    155 	p->p_pos.h = 0;
    156 	return (0);
    157 }
    158 
    159 
    160 /* prompt_get():
    161  *	Retrieve the prompt printing function
    162  */
    163 protected int
    164 prompt_get(EditLine *el, el_pfunc_t *prf, int op)
    165 {
    166 
    167 	if (prf == NULL)
    168 		return (-1);
    169 	if (op == EL_PROMPT)
    170 		*prf = el->el_prompt.p_func;
    171 	else
    172 		*prf = el->el_rprompt.p_func;
    173 	return (0);
    174 }
    175