// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /****************************************************************************** * * Module Name: dbhistry - debugger HISTORY command * * Copyright (C) 2000 - 2019, Intel Corp. * *****************************************************************************/ #include <acpi/acpi.h> #include "accommon.h" #include "acdebug.h" #define _COMPONENT ACPI_CA_DEBUGGER ACPI_MODULE_NAME("dbhistry") #define HI_NO_HISTORY 0 #define HI_RECORD_HISTORY 1 #define HISTORY_SIZE 40 typedef struct history_info { char *command; u32 cmd_num; } HISTORY_INFO; static HISTORY_INFO acpi_gbl_history_buffer[HISTORY_SIZE]; static u16 acpi_gbl_lo_history = 0; static u16 acpi_gbl_num_history = 0; static u16 acpi_gbl_next_history_index = 0; u32 acpi_gbl_next_cmd_num = 1; /******************************************************************************* * * FUNCTION: acpi_db_add_to_history * * PARAMETERS: command_line - Command to add * * RETURN: None * * DESCRIPTION: Add a command line to the history buffer. * ******************************************************************************/ void acpi_db_add_to_history(char *command_line) { u16 cmd_len; u16 buffer_len; /* Put command into the next available slot */ cmd_len = (u16)strlen(command_line); if (!cmd_len) { return; } if (acpi_gbl_history_buffer[acpi_gbl_next_history_index].command != NULL) { buffer_len = (u16) strlen(acpi_gbl_history_buffer[acpi_gbl_next_history_index]. command); if (cmd_len > buffer_len) { acpi_os_free(acpi_gbl_history_buffer [acpi_gbl_next_history_index].command); acpi_gbl_history_buffer[acpi_gbl_next_history_index]. command = acpi_os_allocate(cmd_len + 1); } } else { acpi_gbl_history_buffer[acpi_gbl_next_history_index].command = acpi_os_allocate(cmd_len + 1); } strcpy(acpi_gbl_history_buffer[acpi_gbl_next_history_index].command, command_line); acpi_gbl_history_buffer[acpi_gbl_next_history_index].cmd_num = acpi_gbl_next_cmd_num; /* Adjust indexes */ if ((acpi_gbl_num_history == HISTORY_SIZE) && (acpi_gbl_next_history_index == acpi_gbl_lo_history)) { acpi_gbl_lo_history++; if (acpi_gbl_lo_history >= HISTORY_SIZE) { acpi_gbl_lo_history = 0; } } acpi_gbl_next_history_index++; if (acpi_gbl_next_history_index >= HISTORY_SIZE) { acpi_gbl_next_history_index = 0; } acpi_gbl_next_cmd_num++; if (acpi_gbl_num_history < HISTORY_SIZE) { acpi_gbl_num_history++; } } /******************************************************************************* * * FUNCTION: acpi_db_display_history * * PARAMETERS: None * * RETURN: None * * DESCRIPTION: Display the contents of the history buffer * ******************************************************************************/ void acpi_db_display_history(void) { u32 i; u16 history_index; history_index = acpi_gbl_lo_history; /* Dump entire history buffer */ for (i = 0; i < acpi_gbl_num_history; i++) { if (acpi_gbl_history_buffer[history_index].command) { acpi_os_printf("%3ld %s\n", acpi_gbl_history_buffer[history_index]. cmd_num, acpi_gbl_history_buffer[history_index]. command); } history_index++; if (history_index >= HISTORY_SIZE) { history_index = 0; } } } /******************************************************************************* * * FUNCTION: acpi_db_get_from_history * * PARAMETERS: command_num_arg - String containing the number of the * command to be retrieved * * RETURN: Pointer to the retrieved command. Null on error. * * DESCRIPTION: Get a command from the history buffer * ******************************************************************************/ char *acpi_db_get_from_history(char *command_num_arg) { u32 cmd_num; if (command_num_arg == NULL) { cmd_num = acpi_gbl_next_cmd_num - 1; } else { cmd_num = strtoul(command_num_arg, NULL, 0); } return (acpi_db_get_history_by_index(cmd_num)); } /******************************************************************************* * * FUNCTION: acpi_db_get_history_by_index * * PARAMETERS: cmd_num - Index of the desired history entry. * Values are 0...(acpi_gbl_next_cmd_num - 1) * * RETURN: Pointer to the retrieved command. Null on error. * * DESCRIPTION: Get a command from the history buffer * ******************************************************************************/ char *acpi_db_get_history_by_index(u32 cmd_num) { u32 i; u16 history_index; /* Search history buffer */ history_index = acpi_gbl_lo_history; for (i = 0; i < acpi_gbl_num_history; i++) { if (acpi_gbl_history_buffer[history_index].cmd_num == cmd_num) { /* Found the command, return it */ return (acpi_gbl_history_buffer[history_index].command); } /* History buffer is circular */ history_index++; if (history_index >= HISTORY_SIZE) { history_index = 0; } } acpi_os_printf("Invalid history number: %u\n", history_index); return (NULL); }