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prompt.c revision 1.15 
      1 /*	$NetBSD: prompt.c,v 1.15 2009/04/16 19:39:37 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 1.15 2009/04/16 19:39:37 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 	int ignore = 0;
     91 
     92 	if (op == EL_PROMPT)
     93 		elp = &el->el_prompt;
     94 	else
     95 		elp = &el->el_rprompt;
     96 
     97 	for (p = (*elp->p_func)(el); *p; p++) {
     98 		if (elp->p_ignore == *p) {
     99 			ignore = !ignore;
    100 			continue;
    101 		}
    102 		if (ignore)
    103 			term__putc(el, *p);
    104 		else
    105 			re_putc(el, *p, 1);
    106 	}
    107 
    108 	elp->p_pos.v = el->el_refresh.r_cursor.v;
    109 	elp->p_pos.h = el->el_refresh.r_cursor.h;
    110 }
    111 
    112 
    113 /* prompt_init():
    114  *	Initialize the prompt stuff
    115  */
    116 protected int
    117 prompt_init(EditLine *el)
    118 {
    119 
    120 	el->el_prompt.p_func = prompt_default;
    121 	el->el_prompt.p_pos.v = 0;
    122 	el->el_prompt.p_pos.h = 0;
    123 	el->el_prompt.p_ignore = '\0';
    124 	el->el_rprompt.p_func = prompt_default_r;
    125 	el->el_rprompt.p_pos.v = 0;
    126 	el->el_rprompt.p_pos.h = 0;
    127 	el->el_rprompt.p_ignore = '\0';
    128 	return 0;
    129 }
    130 
    131 
    132 /* prompt_end():
    133  *	Clean up the prompt stuff
    134  */
    135 protected void
    136 /*ARGSUSED*/
    137 prompt_end(EditLine *el __attribute__((__unused__)))
    138 {
    139 }
    140 
    141 
    142 /* prompt_set():
    143  *	Install a prompt printing function
    144  */
    145 protected int
    146 prompt_set(EditLine *el, el_pfunc_t prf, char c, int op)
    147 {
    148 	el_prompt_t *p;
    149 
    150 	if (op == EL_PROMPT)
    151 		p = &el->el_prompt;
    152 	else
    153 		p = &el->el_rprompt;
    154 
    155 	if (prf == NULL) {
    156 		if (op == EL_PROMPT)
    157 			p->p_func = prompt_default;
    158 		else
    159 			p->p_func = prompt_default_r;
    160 	} else
    161 		p->p_func = prf;
    162 
    163 	p->p_ignore = c;
    164 
    165 	p->p_pos.v = 0;
    166 	p->p_pos.h = 0;
    167 
    168 	return 0;
    169 }
    170 
    171 
    172 /* prompt_get():
    173  *	Retrieve the prompt printing function
    174  */
    175 protected int
    176 prompt_get(EditLine *el, el_pfunc_t *prf, char *c, int op)
    177 {
    178 	el_prompt_t *p;
    179 
    180 	if (prf == NULL)
    181 		return -1;
    182 
    183 	if (op == EL_PROMPT)
    184 		p = &el->el_prompt;
    185 	else
    186 		p = &el->el_rprompt;
    187 
    188 	*prf = el->el_rprompt.p_func;
    189 
    190 	if (c)
    191 		*c = p->p_ignore;
    192 
    193 	return 0;
    194 }
    195