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  1. /*
  2.  * Copyright (c) 2008 Jiri Svoboda
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup debug
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <stdio.h>
  36. #include <stdlib.h>
  37.  
  38. #include "cons.h"
  39.  
  40. static char *line_buffer;
  41. static int line_chars;
  42.  
  43. static int line_active = 0;
  44.  
  45. static void line_show(void)
  46. {
  47.     int i;
  48.  
  49.     printf("> ");
  50.     for (i = 0; i < line_chars; ++i)
  51.         putchar(line_buffer[i]);
  52. }
  53.  
  54. static void line_hide(void)
  55. {
  56.     int i;
  57.  
  58.     printf("\b\b");
  59.     for (i = 0; i < line_chars; ++i)
  60.         putchar('\b');
  61. }
  62.  
  63. void cons_printf(const char *fmt, ...)
  64. {
  65.     va_list ap;
  66.  
  67.     if (line_active) line_hide();
  68.     va_start(ap, fmt);
  69.     vprintf(fmt, ap);
  70.     va_end(ap);
  71.     if (line_active) line_show();
  72. }
  73.  
  74. void cons_read_line(char *buffer, int n)
  75. {
  76.     char c;
  77.  
  78.     line_buffer = buffer;
  79.     line_chars = 0;
  80.  
  81.     line_active = 1;
  82.     line_show();
  83.  
  84.     line_chars = 0;
  85.     while (line_chars < n - 1) {
  86.         c = getchar();
  87.         if (c == '\n') break;
  88.         if (c == '\b') {
  89.             if (line_chars > 0) {
  90.                 putchar('\b');
  91.                 --line_chars;
  92.             }
  93.             continue;
  94.         }
  95.        
  96.         putchar(c);
  97.         buffer[line_chars++] = c;
  98.     }
  99.  
  100.     putchar('\n');
  101.     buffer[line_chars] = '\0';
  102.  
  103.     line_active = 0;
  104. }
  105.  
  106. /** @}
  107.  */
  108.