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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.     fflush(stdout);
  54. }
  55.  
  56. static void line_hide(void)
  57. {
  58.     int i;
  59.  
  60.     printf("\b\b");
  61.     for (i = 0; i < line_chars; ++i)
  62.         putchar('\b');
  63. }
  64.  
  65. void cons_printf(const char *fmt, ...)
  66. {
  67.     va_list ap;
  68.  
  69.     if (line_active) line_hide();
  70.     va_start(ap, fmt);
  71.     vprintf(fmt, ap);
  72.     va_end(ap);
  73.     if (line_active) line_show();
  74. }
  75.  
  76. void cons_read_line(char *buffer, int n)
  77. {
  78.     char c;
  79.  
  80.     line_buffer = buffer;
  81.     line_chars = 0;
  82.  
  83.     line_active = 1;
  84.     line_show();
  85.  
  86.     line_chars = 0;
  87.     while (line_chars < n - 1) {
  88.         c = getchar();
  89.         if (c == '\n') break;
  90.         if (c == '\b') {
  91.             if (line_chars > 0) {
  92.                 putchar('\b');
  93.                 --line_chars;
  94.             }
  95.             continue;
  96.         }
  97.        
  98.         putchar(c);
  99.         buffer[line_chars++] = c;
  100.     }
  101.  
  102.     putchar('\n');
  103.     buffer[line_chars] = '\0';
  104.  
  105.     line_active = 0;
  106. }
  107.  
  108. /** @}
  109.  */
  110.