lib/libedit/prompt.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Christos Zoulas of Cornell University.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * @(#)prompt.c 8.1 (Berkeley) 6/4/93
  33  * $NetBSD: prompt.c,v 1.11 2003/08/07 16:44:32 agc Exp $
  34  * $DragonFly: src/lib/libedit/prompt.c,v 1.5 2005/11/13 12:58:30 corecode Exp $
  35  */
  36
  37 #include "config.h"
  38
  39 /*
  40  * prompt.c: Prompt printing functions
  41  */
  42 #include <stdio.h>
  43 #include "el.h"
  44
  45 private char    *prompt_default(EditLine *);
  46 private char    *prompt_default_r(EditLine *);
  47
  48 /* prompt_default():
  49  *      Just a default prompt, in case the user did not provide one
  50  */
  51 private char *
  52 /*ARGSUSED*/
  53 prompt_default(EditLine *el __attribute__((__unused__)))
  54 {
  55         static char a[3] = {'?', ' ', '\0'};
  56
  57         return (a);
  58 }
  59
  60
  61 /* prompt_default_r():
  62  *      Just a default rprompt, in case the user did not provide one
  63  */
  64 private char *
  65 /*ARGSUSED*/
  66 prompt_default_r(EditLine *el __attribute__((__unused__)))
  67 {
  68         static char a[1] = {'\0'};
  69
  70         return (a);
  71 }
  72
  73
  74 /* prompt_print():
  75  *      Print the prompt and update the prompt position.
  76  *      We use an array of integers in case we want to pass
  77  *      literal escape sequences in the prompt and we want a
  78  *      bit to flag them
  79  */
  80 protected void
  81 prompt_print(EditLine *el, int op)
  82 {
  83         el_prompt_t *elp;
  84         char *p;
  85
  86         if (op == EL_PROMPT)
  87                 elp = &el->el_prompt;
  88         else
  89                 elp = &el->el_rprompt;
  90         p = (elp->p_func) (el);
  91         while (*p)
  92                 re_putc(el, *p++, 1);
  93
  94         elp->p_pos.v = el->el_refresh.r_cursor.v;
  95         elp->p_pos.h = el->el_refresh.r_cursor.h;
  96 }
  97
  98
  99 /* prompt_init():
 100  *      Initialize the prompt stuff
 101  */
 102 protected int
 103 prompt_init(EditLine *el)
 104 {
 105
 106         el->el_prompt.p_func = prompt_default;
 107         el->el_prompt.p_pos.v = 0;
 108         el->el_prompt.p_pos.h = 0;
 109         el->el_rprompt.p_func = prompt_default_r;
 110         el->el_rprompt.p_pos.v = 0;
 111         el->el_rprompt.p_pos.h = 0;
 112         return (0);
 113 }
 114
 115
 116 /* prompt_end():
 117  *      Clean up the prompt stuff
 118  */
 119 protected void
 120 /*ARGSUSED*/
 121 prompt_end(EditLine *el __attribute__((__unused__)))
 122 {
 123 }
 124
 125
 126 /* prompt_set():
 127  *      Install a prompt printing function
 128  */
 129 protected int
 130 prompt_set(EditLine *el, el_pfunc_t prf, int op)
 131 {
 132         el_prompt_t *p;
 133
 134         if (op == EL_PROMPT)
 135                 p = &el->el_prompt;
 136         else
 137                 p = &el->el_rprompt;
 138         if (prf == NULL) {
 139                 if (op == EL_PROMPT)
 140                         p->p_func = prompt_default;
 141                 else
 142                         p->p_func = prompt_default_r;
 143         } else
 144                 p->p_func = prf;
 145         p->p_pos.v = 0;
 146         p->p_pos.h = 0;
 147         return (0);
 148 }
 149
 150
 151 /* prompt_get():
 152  *      Retrieve the prompt printing function
 153  */
 154 protected int
 155 prompt_get(EditLine *el, el_pfunc_t *prf, int op)
 156 {
 157
 158         if (prf == NULL)
 159                 return (-1);
 160         if (op == EL_PROMPT)
 161                 *prf = el->el_prompt.p_func;
 162         else
 163                 *prf = el->el_rprompt.p_func;
 164         return (0);
 165 }