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

   1 /*******************************************************************************
   2  *
   3  * Module Name: utnonansi - Non-ansi C library 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 #define _COMPONENT          ACPI_UTILITIES
  49         ACPI_MODULE_NAME    ("utnonansi")
  50
  51 /*
  52  * Non-ANSI C library functions - strlwr, strupr, stricmp, and "safe"
  53  * string functions.
  54  */
  55
  56 /*******************************************************************************
  57  *
  58  * FUNCTION:    AcpiUtStrlwr (strlwr)
  59  *
  60  * PARAMETERS:  SrcString       - The source string to convert
  61  *
  62  * RETURN:      None
  63  *
  64  * DESCRIPTION: Convert a string to lowercase
  65  *
  66  ******************************************************************************/
  67
  68 void
  69 AcpiUtStrlwr (
  70     char                    *SrcString)
  71 {
  72     char                    *String;
  73
  74
  75     ACPI_FUNCTION_ENTRY ();
  76
  77
  78     if (!SrcString)
  79     {
  80         return;
  81     }
  82
  83     /* Walk entire string, lowercasing the letters */
  84
  85     for (String = SrcString; *String; String++)
  86     {
  87         *String = (char) tolower ((int) *String);
  88     }
  89 }
  90
  91
  92 /*******************************************************************************
  93  *
  94  * FUNCTION:    AcpiUtStrupr (strupr)
  95  *
  96  * PARAMETERS:  SrcString       - The source string to convert
  97  *
  98  * RETURN:      None
  99  *
 100  * DESCRIPTION: Convert a string to uppercase
 101  *
 102  ******************************************************************************/
 103
 104 void
 105 AcpiUtStrupr (
 106     char                    *SrcString)
 107 {
 108     char                    *String;
 109
 110
 111     ACPI_FUNCTION_ENTRY ();
 112
 113
 114     if (!SrcString)
 115     {
 116         return;
 117     }
 118
 119     /* Walk entire string, uppercasing the letters */
 120
 121     for (String = SrcString; *String; String++)
 122     {
 123         *String = (char) toupper ((int) *String);
 124     }
 125 }
 126
 127
 128 /******************************************************************************
 129  *
 130  * FUNCTION:    AcpiUtStricmp (stricmp)
 131  *
 132  * PARAMETERS:  String1             - first string to compare
 133  *              String2             - second string to compare
 134  *
 135  * RETURN:      int that signifies string relationship. Zero means strings
 136  *              are equal.
 137  *
 138  * DESCRIPTION: Case-insensitive string compare. Implementation of the
 139  *              non-ANSI stricmp function.
 140  *
 141  ******************************************************************************/
 142
 143 int
 144 AcpiUtStricmp (
 145     char                    *String1,
 146     char                    *String2)
 147 {
 148     int                     c1;
 149     int                     c2;
 150
 151
 152     do
 153     {
 154         c1 = tolower ((int) *String1);
 155         c2 = tolower ((int) *String2);
 156
 157         String1++;
 158         String2++;
 159     }
 160     while ((c1 == c2) && (c1));
 161
 162     return (c1 - c2);
 163 }
 164
 165
 166 #if defined (ACPI_DEBUGGER) || defined (ACPI_APPLICATION)
 167 /*******************************************************************************
 168  *
 169  * FUNCTION:    AcpiUtSafeStrcpy, AcpiUtSafeStrcat, AcpiUtSafeStrncat
 170  *
 171  * PARAMETERS:  Adds a "DestSize" parameter to each of the standard string
 172  *              functions. This is the size of the Destination buffer.
 173  *
 174  * RETURN:      TRUE if the operation would overflow the destination buffer.
 175  *
 176  * DESCRIPTION: Safe versions of standard Clib string functions. Ensure that
 177  *              the result of the operation will not overflow the output string
 178  *              buffer.
 179  *
 180  * NOTE:        These functions are typically only helpful for processing
 181  *              user input and command lines. For most ACPICA code, the
 182  *              required buffer length is precisely calculated before buffer
 183  *              allocation, so the use of these functions is unnecessary.
 184  *
 185  ******************************************************************************/
 186
 187 BOOLEAN
 188 AcpiUtSafeStrcpy (
 189     char                    *Dest,
 190     ACPI_SIZE               DestSize,
 191     char                    *Source)
 192 {
 193
 194     if (strlen (Source) >= DestSize)
 195     {
 196         return (TRUE);
 197     }
 198
 199     strcpy (Dest, Source);
 200     return (FALSE);
 201 }
 202
 203 BOOLEAN
 204 AcpiUtSafeStrcat (
 205     char                    *Dest,
 206     ACPI_SIZE               DestSize,
 207     char                    *Source)
 208 {
 209
 210     if ((strlen (Dest) + strlen (Source)) >= DestSize)
 211     {
 212         return (TRUE);
 213     }
 214
 215     strcat (Dest, Source);
 216     return (FALSE);
 217 }
 218
 219 BOOLEAN
 220 AcpiUtSafeStrncat (
 221     char                    *Dest,
 222     ACPI_SIZE               DestSize,
 223     char                    *Source,
 224     ACPI_SIZE               MaxTransferLength)
 225 {
 226     ACPI_SIZE               ActualTransferLength;
 227
 228
 229     ActualTransferLength = ACPI_MIN (MaxTransferLength, strlen (Source));
 230
 231     if ((strlen (Dest) + ActualTransferLength) >= DestSize)
 232     {
 233         return (TRUE);
 234     }
 235
 236     strncat (Dest, Source, MaxTransferLength);
 237     return (FALSE);
 238 }
 239
 240 void
 241 AcpiUtSafeStrncpy (
 242     char                    *Dest,
 243     char                    *Source,
 244     ACPI_SIZE               DestSize)
 245 {
 246     /* Always terminate destination string */
 247
 248     strncpy (Dest, Source, DestSize);
 249     Dest[DestSize - 1] = 0;
 250 }
 251
 252 #endif