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prompt.c revision 1.12 
      1 /*	$NetBSD: prompt.c,v 1.12 2009/02/17 21:34:26 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. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include "config.h"
     36 #if !defined(lint) && !defined(SCCSID)
     37 #if 0
     38 static char sccsid[] = "@(#)prompt.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 __RCSID("$NetBSD: prompt.c,v 1.12 2009/02/17 21:34:26 christos Exp $");
     41 #endif
     42 #endif /* not lint && not SCCSID */
     43 
     44 /*
     45  * prompt.c: Prompt printing functions
     46  */
     47 #include <stdio.h>
     48 #include "el.h"
     49 
     50 private char	*prompt_default(EditLine *);
     51 private char	*prompt_default_r(EditLine *);
     52 
     53 /* prompt_default():
     54  *	Just a default prompt, in case the user did not provide one
     55  */
     56 private char *
     57 /*ARGSUSED*/
     58 prompt_default(EditLine *el __attribute__((__unused__)))
     59 {
     60 	static char a[3] = {'?', ' ', '\0'};
     61 
     62 	return (a);
     63 }
     64 
     65 
     66 /* prompt_default_r():
     67  *	Just a default rprompt, in case the user did not provide one
     68  */
     69 private char *
     70 /*ARGSUSED*/
     71 prompt_default_r(EditLine *el __attribute__((__unused__)))
     72 {
     73 	static char a[1] = {'\0'};
     74 
     75 	return (a);
     76 }
     77 
     78 
     79 /* prompt_print():
     80  *	Print the prompt and update the prompt position.
     81  *	We use an array of integers in case we want to pass
     82  * 	literal escape sequences in the prompt and we want a
     83  *	bit to flag them
     84  */
     85 protected void
     86 prompt_print(EditLine *el, int op)
     87 {
     88 	el_prompt_t *elp;
     89 	char *p;
     90 
     91 	if (op == EL_PROMPT)
     92 		elp = &el->el_prompt;
     93 	else
     94 		elp = &el->el_rprompt;
     95 	p = (elp->p_func) (el);
     96 	while (*p)
     97 		re_putc(el, *p++, 1);
     98 
     99 	elp->p_pos.v = el->el_refresh.r_cursor.v;
    100 	elp->p_pos.h = el->el_refresh.r_cursor.h;
    101 }
    102 
    103 
    104 /* prompt_init():
    105  *	Initialize the prompt stuff
    106  */
    107 protected int
    108 prompt_init(EditLine *el)
    109 {
    110 
    111 	el->el_prompt.p_func = prompt_default;
    112 	el->el_prompt.p_pos.v = 0;
    113 	el->el_prompt.p_pos.h = 0;
    114 	el->el_rprompt.p_func = prompt_default_r;
    115 	el->el_rprompt.p_pos.v = 0;
    116 	el->el_rprompt.p_pos.h = 0;
    117 	return (0);
    118 }
    119 
    120 
    121 /* prompt_end():
    122  *	Clean up the prompt stuff
    123  */
    124 protected void
    125 /*ARGSUSED*/
    126 prompt_end(EditLine *el __attribute__((__unused__)))
    127 {
    128 }
    129 
    130 
    131 /* prompt_set():
    132  *	Install a prompt printing function
    133  */
    134 protected int
    135 prompt_set(EditLine *el, el_pfunc_t prf, void *arg, int op)
    136 {
    137 	el_prompt_t *p;
    138 
    139 	if (op == EL_PROMPT)
    140 		p = &el->el_prompt;
    141 	else
    142 		p = &el->el_rprompt;
    143 
    144 	if (prf == NULL) {
    145 		if (op == EL_PROMPT)
    146 			p->p_func = prompt_default;
    147 		else
    148 			p->p_func = prompt_default_r;
    149 		p->p_arg = NULL;
    150 	} else {
    151 		p->p_func = prf;
    152 		p->p_arg = arg;
    153 	}
    154 
    155 	p->p_pos.v = 0;
    156 	p->p_pos.h = 0;
    157 	return (0);
    158 }
    159 
    160 
    161 /* prompt_get():
    162  *	Retrieve the prompt printing function
    163  */
    164 protected int
    165 prompt_get(EditLine *el, el_pfunc_t *prf, void **arg, int op)
    166 {
    167 	el_prompt_t *p;
    168 
    169 	if (prf == NULL)
    170 		return (-1);
    171 
    172 	if (op == EL_PROMPT)
    173 		p = &el->el_prompt;
    174 	else
    175 		p = &el->el_rprompt;
    176 
    177 	*prf = p->p_func;
    178 
    179 	if (arg)
    180 		*arg = p->p_arg;
    181 	return (0);
    182 }
    183