1 /******************************************************************************
2  *
3  * Module Name: utascii - Utility ascii functions
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2017, 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.h"
45 #include "accommon.h"
46 
47 
48 /*******************************************************************************
49  *
50  * FUNCTION:    AcpiUtValidNameseg
51  *
52  * PARAMETERS:  Name            - The name or table signature to be examined.
53  *                                Four characters, does not have to be a
54  *                                NULL terminated string.
55  *
56  * RETURN:      TRUE if signature is has 4 valid ACPI characters
57  *
58  * DESCRIPTION: Validate an ACPI table signature.
59  *
60  ******************************************************************************/
61 
62 BOOLEAN
63 AcpiUtValidNameseg (
64     char                    *Name)
65 {
66     UINT32                  i;
67 
68 
69     /* Validate each character in the signature */
70 
71     for (i = 0; i < ACPI_NAME_SIZE; i++)
72     {
73         if (!AcpiUtValidNameChar (Name[i], i))
74         {
75             return (FALSE);
76         }
77     }
78 
79     return (TRUE);
80 }
81 
82 
83 /*******************************************************************************
84  *
85  * FUNCTION:    AcpiUtValidNameChar
86  *
87  * PARAMETERS:  Char            - The character to be examined
88  *              Position        - Byte position (0-3)
89  *
90  * RETURN:      TRUE if the character is valid, FALSE otherwise
91  *
92  * DESCRIPTION: Check for a valid ACPI character. Must be one of:
93  *              1) Upper case alpha
94  *              2) numeric
95  *              3) underscore
96  *
97  *              We allow a '!' as the last character because of the ASF! table
98  *
99  ******************************************************************************/
100 
101 BOOLEAN
102 AcpiUtValidNameChar (
103     char                    Character,
104     UINT32                  Position)
105 {
106 
107     if (!((Character >= 'A' && Character <= 'Z') ||
108           (Character >= '0' && Character <= '9') ||
109           (Character == '_')))
110     {
111         /* Allow a '!' in the last position */
112 
113         if (Character == '!' && Position == 3)
114         {
115             return (TRUE);
116         }
117 
118         return (FALSE);
119     }
120 
121     return (TRUE);
122 }
123 
124 
125 /*******************************************************************************
126  *
127  * FUNCTION:    AcpiUtCheckAndRepairAscii
128  *
129  * PARAMETERS:  Name                - Ascii string
130  *              Count               - Number of characters to check
131  *
132  * RETURN:      None
133  *
134  * DESCRIPTION: Ensure that the requested number of characters are printable
135  *              Ascii characters. Sets non-printable and null chars to <space>.
136  *
137  ******************************************************************************/
138 
139 void
140 AcpiUtCheckAndRepairAscii (
141     UINT8                   *Name,
142     char                    *RepairedName,
143     UINT32                  Count)
144 {
145     UINT32                  i;
146 
147 
148     for (i = 0; i < Count; i++)
149     {
150         RepairedName[i] = (char) Name[i];
151 
152         if (!Name[i])
153         {
154             return;
155         }
156         if (!isprint (Name[i]))
157         {
158             RepairedName[i] = ' ';
159         }
160     }
161 }
162