1 /****************************************************************************** 2 * 3 * Module Name: asutils - common utilities 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2021, 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 MERCHANTABILITY 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 "acpisrc.h" 45 46 47 /****************************************************************************** 48 * 49 * FUNCTION: AsSkipUntilChar 50 * 51 * DESCRIPTION: Find the next instance of the input character 52 * 53 ******************************************************************************/ 54 55 char * 56 AsSkipUntilChar ( 57 char *Buffer, 58 char Target) 59 { 60 61 while (*Buffer != Target) 62 { 63 if (!*Buffer) 64 { 65 return (NULL); 66 } 67 68 Buffer++; 69 } 70 71 return (Buffer); 72 } 73 74 75 /****************************************************************************** 76 * 77 * FUNCTION: AsSkipPastChar 78 * 79 * DESCRIPTION: Find the next instance of the input character, return a buffer 80 * pointer to this character+1. 81 * 82 ******************************************************************************/ 83 84 char * 85 AsSkipPastChar ( 86 char *Buffer, 87 char Target) 88 { 89 90 while (*Buffer != Target) 91 { 92 if (!*Buffer) 93 { 94 return (NULL); 95 } 96 97 Buffer++; 98 } 99 100 Buffer++; 101 return (Buffer); 102 } 103 104 105 /****************************************************************************** 106 * 107 * FUNCTION: AsReplaceData 108 * 109 * DESCRIPTION: This function inserts and removes data from the file buffer. 110 * if more data is inserted than is removed, the data in the buffer 111 * is moved to make room. If less data is inserted than is removed, 112 * the remaining data is moved to close the hole. 113 * 114 ******************************************************************************/ 115 116 char * 117 AsReplaceData ( 118 char *Buffer, 119 UINT32 LengthToRemove, 120 char *BufferToAdd, 121 UINT32 LengthToAdd) 122 { 123 UINT32 BufferLength; 124 125 126 /* 127 * Buffer is a string, so the length must include the terminating zero 128 */ 129 BufferLength = strlen (Buffer) + 1; 130 131 if (LengthToRemove != LengthToAdd) 132 { 133 /* 134 * Move some of the existing data 135 * 1) If adding more bytes than removing, make room for the new data 136 * 2) if removing more bytes than adding, delete the extra space 137 */ 138 Gbl_MadeChanges = TRUE; 139 memmove ((Buffer + LengthToAdd), (Buffer + LengthToRemove), 140 (BufferLength - LengthToRemove)); 141 } 142 143 /* 144 * Now we can move in the new data 145 */ 146 if (LengthToAdd > 0) 147 { 148 Gbl_MadeChanges = TRUE; 149 memmove (Buffer, BufferToAdd, LengthToAdd); 150 } 151 152 return (Buffer + LengthToAdd); 153 } 154 155 156 /****************************************************************************** 157 * 158 * FUNCTION: AsInsertData 159 * 160 * DESCRIPTION: This function inserts and removes data from the file buffer. 161 * if more data is inserted than is removed, the data in the buffer 162 * is moved to make room. If less data is inserted than is removed, 163 * the remaining data is moved to close the hole. 164 * 165 ******************************************************************************/ 166 167 char * 168 AsInsertData ( 169 char *Buffer, 170 char *BufferToAdd, 171 UINT32 LengthToAdd) 172 { 173 UINT32 BufferLength; 174 175 176 if (LengthToAdd > 0) 177 { 178 /* 179 * Buffer is a string, so the length must include the terminating zero 180 */ 181 BufferLength = strlen (Buffer) + 1; 182 183 /* 184 * Move some of the existing data 185 * 1) If adding more bytes than removing, make room for the new data 186 * 2) if removing more bytes than adding, delete the extra space 187 */ 188 Gbl_MadeChanges = TRUE; 189 memmove ((Buffer + LengthToAdd), Buffer, BufferLength); 190 191 /* 192 * Now we can move in the new data 193 */ 194 memmove (Buffer, BufferToAdd, LengthToAdd); 195 } 196 197 return (Buffer + LengthToAdd); 198 } 199 200 201 /****************************************************************************** 202 * 203 * FUNCTION: AsRemoveData 204 * 205 * DESCRIPTION: This function inserts and removes data from the file buffer. 206 * if more data is inserted than is removed, the data in the buffer 207 * is moved to make room. If less data is inserted than is removed, 208 * the remaining data is moved to close the hole. 209 * 210 ******************************************************************************/ 211 212 char * 213 AsRemoveData ( 214 char *StartPointer, 215 char *EndPointer) 216 { 217 UINT32 BufferLength; 218 219 220 /* 221 * Buffer is a string, so the length must include the terminating zero 222 */ 223 BufferLength = strlen (EndPointer) + 1; 224 225 Gbl_MadeChanges = TRUE; 226 memmove (StartPointer, EndPointer, BufferLength); 227 228 return (StartPointer); 229 } 230