1 /******************************************************************************
2 *
3 * Module Name: utascii - Utility ascii functions
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2016, 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
47 /*******************************************************************************
48 *
49 * FUNCTION: acpi_ut_valid_nameseg
50 *
51 * PARAMETERS: name - The name or table signature to be examined.
52 * Four characters, does not have to be a
53 * NULL terminated string.
54 *
55 * RETURN: TRUE if signature is has 4 valid ACPI characters
56 *
57 * DESCRIPTION: Validate an ACPI table signature.
58 *
59 ******************************************************************************/
60
acpi_ut_valid_nameseg(char * name)61 u8 acpi_ut_valid_nameseg(char *name)
62 {
63 u32 i;
64
65 /* Validate each character in the signature */
66
67 for (i = 0; i < ACPI_NAME_SIZE; i++) {
68 if (!acpi_ut_valid_name_char(name[i], i)) {
69 return (FALSE);
70 }
71 }
72
73 return (TRUE);
74 }
75
76 /*******************************************************************************
77 *
78 * FUNCTION: acpi_ut_valid_name_char
79 *
80 * PARAMETERS: char - The character to be examined
81 * position - Byte position (0-3)
82 *
83 * RETURN: TRUE if the character is valid, FALSE otherwise
84 *
85 * DESCRIPTION: Check for a valid ACPI character. Must be one of:
86 * 1) Upper case alpha
87 * 2) numeric
88 * 3) underscore
89 *
90 * We allow a '!' as the last character because of the ASF! table
91 *
92 ******************************************************************************/
93
acpi_ut_valid_name_char(char character,u32 position)94 u8 acpi_ut_valid_name_char(char character, u32 position)
95 {
96
97 if (!((character >= 'A' && character <= 'Z') ||
98 (character >= '0' && character <= '9') || (character == '_'))) {
99
100 /* Allow a '!' in the last position */
101
102 if (character == '!' && position == 3) {
103 return (TRUE);
104 }
105
106 return (FALSE);
107 }
108
109 return (TRUE);
110 }
111
112 /*******************************************************************************
113 *
114 * FUNCTION: acpi_ut_check_and_repair_ascii
115 *
116 * PARAMETERS: name - Ascii string
117 * count - Number of characters to check
118 *
119 * RETURN: None
120 *
121 * DESCRIPTION: Ensure that the requested number of characters are printable
122 * Ascii characters. Sets non-printable and null chars to <space>.
123 *
124 ******************************************************************************/
125
acpi_ut_check_and_repair_ascii(u8 * name,char * repaired_name,u32 count)126 void acpi_ut_check_and_repair_ascii(u8 *name, char *repaired_name, u32 count)
127 {
128 u32 i;
129
130 for (i = 0; i < count; i++) {
131 repaired_name[i] = (char)name[i];
132
133 if (!name[i]) {
134 return;
135 }
136 if (!isprint(name[i])) {
137 repaired_name[i] = ' ';
138 }
139 }
140 }
141