drivers/acpi/acpica/utascii.c

   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/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
  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
  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
 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 }