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ACPICA: adding SPDX headers
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1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: dbhistry - debugger HISTORY command
5 *
6 * Copyright (C) 2000 - 2018, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acdebug.h"
13
14 #define _COMPONENT ACPI_CA_DEBUGGER
15 ACPI_MODULE_NAME("dbhistry")
16
17 #define HI_NO_HISTORY 0
18 #define HI_RECORD_HISTORY 1
19 #define HISTORY_SIZE 40
20 typedef struct history_info {
21 char *command;
22 u32 cmd_num;
23
24 } HISTORY_INFO;
25
26 static HISTORY_INFO acpi_gbl_history_buffer[HISTORY_SIZE];
27 static u16 acpi_gbl_lo_history = 0;
28 static u16 acpi_gbl_num_history = 0;
29 static u16 acpi_gbl_next_history_index = 0;
30 u32 acpi_gbl_next_cmd_num = 1;
31
32 /*******************************************************************************
33 *
34 * FUNCTION: acpi_db_add_to_history
35 *
36 * PARAMETERS: command_line - Command to add
37 *
38 * RETURN: None
39 *
40 * DESCRIPTION: Add a command line to the history buffer.
41 *
42 ******************************************************************************/
43
44 void acpi_db_add_to_history(char *command_line)
45 {
46 u16 cmd_len;
47 u16 buffer_len;
48
49 /* Put command into the next available slot */
50
51 cmd_len = (u16)strlen(command_line);
52 if (!cmd_len) {
53 return;
54 }
55
56 if (acpi_gbl_history_buffer[acpi_gbl_next_history_index].command !=
57 NULL) {
58 buffer_len =
59 (u16)
60 strlen(acpi_gbl_history_buffer[acpi_gbl_next_history_index].
61 command);
62
63 if (cmd_len > buffer_len) {
64 acpi_os_free(acpi_gbl_history_buffer
65 [acpi_gbl_next_history_index].command);
66 acpi_gbl_history_buffer[acpi_gbl_next_history_index].
67 command = acpi_os_allocate(cmd_len + 1);
68 }
69 } else {
70 acpi_gbl_history_buffer[acpi_gbl_next_history_index].command =
71 acpi_os_allocate(cmd_len + 1);
72 }
73
74 strcpy(acpi_gbl_history_buffer[acpi_gbl_next_history_index].command,
75 command_line);
76
77 acpi_gbl_history_buffer[acpi_gbl_next_history_index].cmd_num =
78 acpi_gbl_next_cmd_num;
79
80 /* Adjust indexes */
81
82 if ((acpi_gbl_num_history == HISTORY_SIZE) &&
83 (acpi_gbl_next_history_index == acpi_gbl_lo_history)) {
84 acpi_gbl_lo_history++;
85 if (acpi_gbl_lo_history >= HISTORY_SIZE) {
86 acpi_gbl_lo_history = 0;
87 }
88 }
89
90 acpi_gbl_next_history_index++;
91 if (acpi_gbl_next_history_index >= HISTORY_SIZE) {
92 acpi_gbl_next_history_index = 0;
93 }
94
95 acpi_gbl_next_cmd_num++;
96 if (acpi_gbl_num_history < HISTORY_SIZE) {
97 acpi_gbl_num_history++;
98 }
99 }
100
101 /*******************************************************************************
102 *
103 * FUNCTION: acpi_db_display_history
104 *
105 * PARAMETERS: None
106 *
107 * RETURN: None
108 *
109 * DESCRIPTION: Display the contents of the history buffer
110 *
111 ******************************************************************************/
112
113 void acpi_db_display_history(void)
114 {
115 u32 i;
116 u16 history_index;
117
118 history_index = acpi_gbl_lo_history;
119
120 /* Dump entire history buffer */
121
122 for (i = 0; i < acpi_gbl_num_history; i++) {
123 if (acpi_gbl_history_buffer[history_index].command) {
124 acpi_os_printf("%3ld %s\n",
125 acpi_gbl_history_buffer[history_index].
126 cmd_num,
127 acpi_gbl_history_buffer[history_index].
128 command);
129 }
130
131 history_index++;
132 if (history_index >= HISTORY_SIZE) {
133 history_index = 0;
134 }
135 }
136 }
137
138 /*******************************************************************************
139 *
140 * FUNCTION: acpi_db_get_from_history
141 *
142 * PARAMETERS: command_num_arg - String containing the number of the
143 * command to be retrieved
144 *
145 * RETURN: Pointer to the retrieved command. Null on error.
146 *
147 * DESCRIPTION: Get a command from the history buffer
148 *
149 ******************************************************************************/
150
151 char *acpi_db_get_from_history(char *command_num_arg)
152 {
153 u32 cmd_num;
154
155 if (command_num_arg == NULL) {
156 cmd_num = acpi_gbl_next_cmd_num - 1;
157 }
158
159 else {
160 cmd_num = strtoul(command_num_arg, NULL, 0);
161 }
162
163 return (acpi_db_get_history_by_index(cmd_num));
164 }
165
166 /*******************************************************************************
167 *
168 * FUNCTION: acpi_db_get_history_by_index
169 *
170 * PARAMETERS: cmd_num - Index of the desired history entry.
171 * Values are 0...(acpi_gbl_next_cmd_num - 1)
172 *
173 * RETURN: Pointer to the retrieved command. Null on error.
174 *
175 * DESCRIPTION: Get a command from the history buffer
176 *
177 ******************************************************************************/
178
179 char *acpi_db_get_history_by_index(u32 cmd_num)
180 {
181 u32 i;
182 u16 history_index;
183
184 /* Search history buffer */
185
186 history_index = acpi_gbl_lo_history;
187 for (i = 0; i < acpi_gbl_num_history; i++) {
188 if (acpi_gbl_history_buffer[history_index].cmd_num == cmd_num) {
189
190 /* Found the command, return it */
191
192 return (acpi_gbl_history_buffer[history_index].command);
193 }
194
195 /* History buffer is circular */
196
197 history_index++;
198 if (history_index >= HISTORY_SIZE) {
199 history_index = 0;
200 }
201 }
202
203 acpi_os_printf("Invalid history number: %u\n", history_index);
204 return (NULL);
205 }