drivers/bus/acpi/acpica/utilities/utstring.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utstring - Common functions for strings and characters
   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 #include "acnamesp.h"
  47
  48
  49 #define _COMPONENT          ACPI_UTILITIES
  50         ACPI_MODULE_NAME    ("utstring")
  51
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    AcpiUtPrintString
  56  *
  57  * PARAMETERS:  String          - Null terminated ASCII string
  58  *              MaxLength       - Maximum output length. Used to constrain the
  59  *                                length of strings during debug output only.
  60  *
  61  * RETURN:      None
  62  *
  63  * DESCRIPTION: Dump an ASCII string with support for ACPI-defined escape
  64  *              sequences.
  65  *
  66  ******************************************************************************/
  67
  68 void
  69 AcpiUtPrintString (
  70     char                    *String,
  71     UINT16                  MaxLength)
  72 {
  73     UINT32                  i;
  74
  75
  76     if (!String)
  77     {
  78         AcpiOsPrintf ("<\"NULL STRING PTR\">");
  79         return;
  80     }
  81
  82     AcpiOsPrintf ("\"");
  83     for (i = 0; (i < MaxLength) && String[i]; i++)
  84     {
  85         /* Escape sequences */
  86
  87         switch (String[i])
  88         {
  89         case 0x07:
  90
  91             AcpiOsPrintf ("\\a");       /* BELL */
  92             break;
  93
  94         case 0x08:
  95
  96             AcpiOsPrintf ("\\b");       /* BACKSPACE */
  97             break;
  98
  99         case 0x0C:
 100
 101             AcpiOsPrintf ("\\f");       /* FORMFEED */
 102             break;
 103
 104         case 0x0A:
 105
 106             AcpiOsPrintf ("\\n");       /* LINEFEED */
 107             break;
 108
 109         case 0x0D:
 110
 111             AcpiOsPrintf ("\\r");       /* CARRIAGE RETURN*/
 112             break;
 113
 114         case 0x09:
 115
 116             AcpiOsPrintf ("\\t");       /* HORIZONTAL TAB */
 117             break;
 118
 119         case 0x0B:
 120
 121             AcpiOsPrintf ("\\v");       /* VERTICAL TAB */
 122             break;
 123
 124         case '\'':                      /* Single Quote */
 125         case '\"':                      /* Double Quote */
 126         case '\\':                      /* Backslash */
 127
 128             AcpiOsPrintf ("\\%c", (int) String[i]);
 129             break;
 130
 131         default:
 132
 133             /* Check for printable character or hex escape */
 134
 135             if (isprint ((int) String[i]))
 136             {
 137                 /* This is a normal character */
 138
 139                 AcpiOsPrintf ("%c", (int) String[i]);
 140             }
 141             else
 142             {
 143                 /* All others will be Hex escapes */
 144
 145                 AcpiOsPrintf ("\\x%2.2X", (INT32) String[i]);
 146             }
 147             break;
 148         }
 149     }
 150
 151     AcpiOsPrintf ("\"");
 152
 153     if (i == MaxLength && String[i])
 154     {
 155         AcpiOsPrintf ("...");
 156     }
 157 }
 158
 159
 160 /*******************************************************************************
 161  *
 162  * FUNCTION:    AcpiUtRepairName
 163  *
 164  * PARAMETERS:  Name            - The ACPI name to be repaired
 165  *
 166  * RETURN:      Repaired version of the name
 167  *
 168  * DESCRIPTION: Repair an ACPI name: Change invalid characters to '*' and
 169  *              return the new name. NOTE: the Name parameter must reside in
 170  *              read/write memory, cannot be a const.
 171  *
 172  * An ACPI Name must consist of valid ACPI characters. We will repair the name
 173  * if necessary because we don't want to abort because of this, but we want
 174  * all namespace names to be printable. A warning message is appropriate.
 175  *
 176  * This issue came up because there are in fact machines that exhibit
 177  * this problem, and we want to be able to enable ACPI support for them,
 178  * even though there are a few bad names.
 179  *
 180  ******************************************************************************/
 181
 182 void
 183 AcpiUtRepairName (
 184     char                    *Name)
 185 {
 186     UINT32                  i;
 187     BOOLEAN                 FoundBadChar = FALSE;
 188     UINT32                  OriginalName;
 189
 190
 191     ACPI_FUNCTION_NAME (UtRepairName);
 192
 193
 194     /*
 195      * Special case for the root node. This can happen if we get an
 196      * error during the execution of module-level code.
 197      */
 198     if (ACPI_COMPARE_NAME (Name, "\\___"))
 199     {
 200         return;
 201     }
 202
 203     ACPI_MOVE_NAME (&OriginalName, Name);
 204
 205     /* Check each character in the name */
 206
 207     for (i = 0; i < ACPI_NAME_SIZE; i++)
 208     {
 209         if (AcpiUtValidNameChar (Name[i], i))
 210         {
 211             continue;
 212         }
 213
 214         /*
 215          * Replace a bad character with something printable, yet technically
 216          * still invalid. This prevents any collisions with existing "good"
 217          * names in the namespace.
 218          */
 219         Name[i] = '*';
 220         FoundBadChar = TRUE;
 221     }
 222
 223     if (FoundBadChar)
 224     {
 225         /* Report warning only if in strict mode or debug mode */
 226
 227         if (!AcpiGbl_EnableInterpreterSlack)
 228         {
 229             ACPI_WARNING ((AE_INFO,
 230                 "Invalid character(s) in name (0x%.8X), repaired: [%4.4s]",
 231                 OriginalName, Name));
 232         }
 233         else
 234         {
 235             ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 236                 "Invalid character(s) in name (0x%.8X), repaired: [%4.4s]",
 237                 OriginalName, Name));
 238         }
 239     }
 240 }
 241
 242
 243 #if defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP
 244 /*******************************************************************************
 245  *
 246  * FUNCTION:    UtConvertBackslashes
 247  *
 248  * PARAMETERS:  Pathname        - File pathname string to be converted
 249  *
 250  * RETURN:      Modifies the input Pathname
 251  *
 252  * DESCRIPTION: Convert all backslashes (0x5C) to forward slashes (0x2F) within
 253  *              the entire input file pathname string.
 254  *
 255  ******************************************************************************/
 256
 257 void
 258 UtConvertBackslashes (
 259     char                    *Pathname)
 260 {
 261
 262     if (!Pathname)
 263     {
 264         return;
 265     }
 266
 267     while (*Pathname)
 268     {
 269         if (*Pathname == '\\')
 270         {
 271             *Pathname = '/';
 272         }
 273
 274         Pathname++;
 275     }
 276 }
 277 #endif