1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: utascii - Utility ascii functions 5 * 6 * Copyright (C) 2000 - 2022, Intel Corp. 7 * 8 *****************************************************************************/ 9 10 #include <acpi/acpi.h> 11 #include "accommon.h" 12 13 /******************************************************************************* 14 * 15 * FUNCTION: acpi_ut_valid_nameseg 16 * 17 * PARAMETERS: name - The name or table signature to be examined. 18 * Four characters, does not have to be a 19 * NULL terminated string. 20 * 21 * RETURN: TRUE if signature is has 4 valid ACPI characters 22 * 23 * DESCRIPTION: Validate an ACPI table signature. 24 * 25 ******************************************************************************/ 26 27 u8 acpi_ut_valid_nameseg(char *name) 28 { 29 u32 i; 30 31 /* Validate each character in the signature */ 32 33 for (i = 0; i < ACPI_NAMESEG_SIZE; i++) { 34 if (!acpi_ut_valid_name_char(name[i], i)) { 35 return (FALSE); 36 } 37 } 38 39 return (TRUE); 40 } 41 42 /******************************************************************************* 43 * 44 * FUNCTION: acpi_ut_valid_name_char 45 * 46 * PARAMETERS: char - The character to be examined 47 * position - Byte position (0-3) 48 * 49 * RETURN: TRUE if the character is valid, FALSE otherwise 50 * 51 * DESCRIPTION: Check for a valid ACPI character. Must be one of: 52 * 1) Upper case alpha 53 * 2) numeric 54 * 3) underscore 55 * 56 * We allow a '!' as the last character because of the ASF! table 57 * 58 ******************************************************************************/ 59 60 u8 acpi_ut_valid_name_char(char character, u32 position) 61 { 62 63 if (!((character >= 'A' && character <= 'Z') || 64 (character >= '0' && character <= '9') || (character == '_'))) { 65 66 /* Allow a '!' in the last position */ 67 68 if (character == '!' && position == 3) { 69 return (TRUE); 70 } 71 72 return (FALSE); 73 } 74 75 return (TRUE); 76 } 77 78 /******************************************************************************* 79 * 80 * FUNCTION: acpi_ut_check_and_repair_ascii 81 * 82 * PARAMETERS: name - Ascii string 83 * count - Number of characters to check 84 * 85 * RETURN: None 86 * 87 * DESCRIPTION: Ensure that the requested number of characters are printable 88 * Ascii characters. Sets non-printable and null chars to <space>. 89 * 90 ******************************************************************************/ 91 92 void acpi_ut_check_and_repair_ascii(u8 *name, char *repaired_name, u32 count) 93 { 94 u32 i; 95 96 for (i = 0; i < count; i++) { 97 repaired_name[i] = (char)name[i]; 98 99 if (!name[i]) { 100 return; 101 } 102 if (!isprint(name[i])) { 103 repaired_name[i] = ' '; 104 } 105 } 106 } 107