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  1. /******************************************************************************
  2.  *
  3.  * Module Name: dbhistry - debugger HISTORY command
  4.  *
  5.  *****************************************************************************/
  6.  
  7. /*
  8.  * Copyright (C) 2000 - 2015, Intel Corp.
  9.  * All rights reserved.
  10.  *
  11.  * Redistribution and use in source and binary forms, with or without
  12.  * modification, are permitted provided that the following conditions
  13.  * are met:
  14.  * 1. Redistributions of source code must retain the above copyright
  15.  *    notice, this list of conditions, and the following disclaimer,
  16.  *    without modification.
  17.  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18.  *    substantially similar to the "NO WARRANTY" disclaimer below
  19.  *    ("Disclaimer") and any redistribution must be conditioned upon
  20.  *    including a substantially similar Disclaimer requirement for further
  21.  *    binary redistribution.
  22.  * 3. Neither the names of the above-listed copyright holders nor the names
  23.  *    of any contributors may be used to endorse or promote products derived
  24.  *    from this software without specific prior written permission.
  25.  *
  26.  * Alternatively, this software may be distributed under the terms of the
  27.  * GNU General Public License ("GPL") version 2 as published by the Free
  28.  * Software Foundation.
  29.  *
  30.  * NO WARRANTY
  31.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32.  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33.  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34.  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35.  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39.  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40.  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41.  * POSSIBILITY OF SUCH DAMAGES.
  42.  */
  43.  
  44. #include <acpi/acpi.h>
  45. #include "accommon.h"
  46. #include "acdebug.h"
  47.  
  48. #define _COMPONENT          ACPI_CA_DEBUGGER
  49. ACPI_MODULE_NAME("dbhistry")
  50.  
  51. #define HI_NO_HISTORY       0
  52. #define HI_RECORD_HISTORY   1
  53. #define HISTORY_SIZE        40
  54. typedef struct history_info {
  55.         char *command;
  56.         u32 cmd_num;
  57.  
  58. } HISTORY_INFO;
  59.  
  60. static HISTORY_INFO acpi_gbl_history_buffer[HISTORY_SIZE];
  61. static u16 acpi_gbl_lo_history = 0;
  62. static u16 acpi_gbl_num_history = 0;
  63. static u16 acpi_gbl_next_history_index = 0;
  64. u32 acpi_gbl_next_cmd_num = 1;
  65.  
  66. /*******************************************************************************
  67.  *
  68.  * FUNCTION:    acpi_db_add_to_history
  69.  *
  70.  * PARAMETERS:  command_line    - Command to add
  71.  *
  72.  * RETURN:      None
  73.  *
  74.  * DESCRIPTION: Add a command line to the history buffer.
  75.  *
  76.  ******************************************************************************/
  77.  
  78. void acpi_db_add_to_history(char *command_line)
  79. {
  80.         u16 cmd_len;
  81.         u16 buffer_len;
  82.  
  83.         /* Put command into the next available slot */
  84.  
  85.         cmd_len = (u16)strlen(command_line);
  86.         if (!cmd_len) {
  87.                 return;
  88.         }
  89.  
  90.         if (acpi_gbl_history_buffer[acpi_gbl_next_history_index].command !=
  91.             NULL) {
  92.                 buffer_len =
  93.                     (u16)
  94.                     strlen(acpi_gbl_history_buffer[acpi_gbl_next_history_index].
  95.                            command);
  96.  
  97.                 if (cmd_len > buffer_len) {
  98.                         acpi_os_free(acpi_gbl_history_buffer
  99.                                      [acpi_gbl_next_history_index].command);
  100.                         acpi_gbl_history_buffer[acpi_gbl_next_history_index].
  101.                             command = acpi_os_allocate(cmd_len + 1);
  102.                 }
  103.         } else {
  104.                 acpi_gbl_history_buffer[acpi_gbl_next_history_index].command =
  105.                     acpi_os_allocate(cmd_len + 1);
  106.         }
  107.  
  108.         strcpy(acpi_gbl_history_buffer[acpi_gbl_next_history_index].command,
  109.                command_line);
  110.  
  111.         acpi_gbl_history_buffer[acpi_gbl_next_history_index].cmd_num =
  112.             acpi_gbl_next_cmd_num;
  113.  
  114.         /* Adjust indexes */
  115.  
  116.         if ((acpi_gbl_num_history == HISTORY_SIZE) &&
  117.             (acpi_gbl_next_history_index == acpi_gbl_lo_history)) {
  118.                 acpi_gbl_lo_history++;
  119.                 if (acpi_gbl_lo_history >= HISTORY_SIZE) {
  120.                         acpi_gbl_lo_history = 0;
  121.                 }
  122.         }
  123.  
  124.         acpi_gbl_next_history_index++;
  125.         if (acpi_gbl_next_history_index >= HISTORY_SIZE) {
  126.                 acpi_gbl_next_history_index = 0;
  127.         }
  128.  
  129.         acpi_gbl_next_cmd_num++;
  130.         if (acpi_gbl_num_history < HISTORY_SIZE) {
  131.                 acpi_gbl_num_history++;
  132.         }
  133. }
  134.  
  135. /*******************************************************************************
  136.  *
  137.  * FUNCTION:    acpi_db_display_history
  138.  *
  139.  * PARAMETERS:  None
  140.  *
  141.  * RETURN:      None
  142.  *
  143.  * DESCRIPTION: Display the contents of the history buffer
  144.  *
  145.  ******************************************************************************/
  146.  
  147. void acpi_db_display_history(void)
  148. {
  149.         u32 i;
  150.         u16 history_index;
  151.  
  152.         history_index = acpi_gbl_lo_history;
  153.  
  154.         /* Dump entire history buffer */
  155.  
  156.         for (i = 0; i < acpi_gbl_num_history; i++) {
  157.                 if (acpi_gbl_history_buffer[history_index].command) {
  158.                         acpi_os_printf("%3ld %s\n",
  159.                                        acpi_gbl_history_buffer[history_index].
  160.                                        cmd_num,
  161.                                        acpi_gbl_history_buffer[history_index].
  162.                                        command);
  163.                 }
  164.  
  165.                 history_index++;
  166.                 if (history_index >= HISTORY_SIZE) {
  167.                         history_index = 0;
  168.                 }
  169.         }
  170. }
  171.  
  172. /*******************************************************************************
  173.  *
  174.  * FUNCTION:    acpi_db_get_from_history
  175.  *
  176.  * PARAMETERS:  command_num_arg         - String containing the number of the
  177.  *                                        command to be retrieved
  178.  *
  179.  * RETURN:      Pointer to the retrieved command. Null on error.
  180.  *
  181.  * DESCRIPTION: Get a command from the history buffer
  182.  *
  183.  ******************************************************************************/
  184.  
  185. char *acpi_db_get_from_history(char *command_num_arg)
  186. {
  187.         u32 cmd_num;
  188.  
  189.         if (command_num_arg == NULL) {
  190.                 cmd_num = acpi_gbl_next_cmd_num - 1;
  191.         }
  192.  
  193.         else {
  194.                 cmd_num = strtoul(command_num_arg, NULL, 0);
  195.         }
  196.  
  197.         return (acpi_db_get_history_by_index(cmd_num));
  198. }
  199.  
  200. /*******************************************************************************
  201.  *
  202.  * FUNCTION:    acpi_db_get_history_by_index
  203.  *
  204.  * PARAMETERS:  cmd_num             - Index of the desired history entry.
  205.  *                                    Values are 0...(acpi_gbl_next_cmd_num - 1)
  206.  *
  207.  * RETURN:      Pointer to the retrieved command. Null on error.
  208.  *
  209.  * DESCRIPTION: Get a command from the history buffer
  210.  *
  211.  ******************************************************************************/
  212.  
  213. char *acpi_db_get_history_by_index(u32 cmd_num)
  214. {
  215.         u32 i;
  216.         u16 history_index;
  217.  
  218.         /* Search history buffer */
  219.  
  220.         history_index = acpi_gbl_lo_history;
  221.         for (i = 0; i < acpi_gbl_num_history; i++) {
  222.                 if (acpi_gbl_history_buffer[history_index].cmd_num == cmd_num) {
  223.  
  224.                         /* Found the command, return it */
  225.  
  226.                         return (acpi_gbl_history_buffer[history_index].command);
  227.                 }
  228.  
  229.                 /* History buffer is circular */
  230.  
  231.                 history_index++;
  232.                 if (history_index >= HISTORY_SIZE) {
  233.                         history_index = 0;
  234.                 }
  235.         }
  236.  
  237.         acpi_os_printf("Invalid history number: %u\n", history_index);
  238.         return (NULL);
  239. }
  240.