drivers/acpi/acpica/utnonansi.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utnonansi - Non-ansi C library functions
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2018, 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 #define _COMPONENT          ACPI_UTILITIES
  48 ACPI_MODULE_NAME("utnonansi")
  49
  50 /*
  51  * Non-ANSI C library functions - strlwr, strupr, stricmp, and "safe"
  52  * string functions.
  53  */
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_ut_strlwr (strlwr)
  57  *
  58  * PARAMETERS:  src_string      - The source string to convert
  59  *
  60  * RETURN:      None
  61  *
  62  * DESCRIPTION: Convert a string to lowercase
  63  *
  64  ******************************************************************************/
  65 void acpi_ut_strlwr(char *src_string)
  66 {
  67         char *string;
  68
  69         ACPI_FUNCTION_ENTRY();
  70
  71         if (!src_string) {
  72                 return;
  73         }
  74
  75         /* Walk entire string, lowercasing the letters */
  76
  77         for (string = src_string; *string; string++) {
  78                 *string = (char)tolower((int)*string);
  79         }
  80 }
  81
  82 /*******************************************************************************
  83  *
  84  * FUNCTION:    acpi_ut_strupr (strupr)
  85  *
  86  * PARAMETERS:  src_string      - The source string to convert
  87  *
  88  * RETURN:      None
  89  *
  90  * DESCRIPTION: Convert a string to uppercase
  91  *
  92  ******************************************************************************/
  93
  94 void acpi_ut_strupr(char *src_string)
  95 {
  96         char *string;
  97
  98         ACPI_FUNCTION_ENTRY();
  99
 100         if (!src_string) {
 101                 return;
 102         }
 103
 104         /* Walk entire string, uppercasing the letters */
 105
 106         for (string = src_string; *string; string++) {
 107                 *string = (char)toupper((int)*string);
 108         }
 109 }
 110
 111 /******************************************************************************
 112  *
 113  * FUNCTION:    acpi_ut_stricmp (stricmp)
 114  *
 115  * PARAMETERS:  string1             - first string to compare
 116  *              string2             - second string to compare
 117  *
 118  * RETURN:      int that signifies string relationship. Zero means strings
 119  *              are equal.
 120  *
 121  * DESCRIPTION: Case-insensitive string compare. Implementation of the
 122  *              non-ANSI stricmp function.
 123  *
 124  ******************************************************************************/
 125
 126 int acpi_ut_stricmp(char *string1, char *string2)
 127 {
 128         int c1;
 129         int c2;
 130
 131         do {
 132                 c1 = tolower((int)*string1);
 133                 c2 = tolower((int)*string2);
 134
 135                 string1++;
 136                 string2++;
 137         }
 138         while ((c1 == c2) && (c1));
 139
 140         return (c1 - c2);
 141 }
 142
 143 #if defined (ACPI_DEBUGGER) || defined (ACPI_APPLICATION) || defined (ACPI_DEBUG_OUTPUT)
 144 /*******************************************************************************
 145  *
 146  * FUNCTION:    acpi_ut_safe_strcpy, acpi_ut_safe_strcat, acpi_ut_safe_strncat
 147  *
 148  * PARAMETERS:  Adds a "DestSize" parameter to each of the standard string
 149  *              functions. This is the size of the Destination buffer.
 150  *
 151  * RETURN:      TRUE if the operation would overflow the destination buffer.
 152  *
 153  * DESCRIPTION: Safe versions of standard Clib string functions. Ensure that
 154  *              the result of the operation will not overflow the output string
 155  *              buffer.
 156  *
 157  * NOTE:        These functions are typically only helpful for processing
 158  *              user input and command lines. For most ACPICA code, the
 159  *              required buffer length is precisely calculated before buffer
 160  *              allocation, so the use of these functions is unnecessary.
 161  *
 162  ******************************************************************************/
 163
 164 u8 acpi_ut_safe_strcpy(char *dest, acpi_size dest_size, char *source)
 165 {
 166
 167         if (strlen(source) >= dest_size) {
 168                 return (TRUE);
 169         }
 170
 171         strcpy(dest, source);
 172         return (FALSE);
 173 }
 174
 175 u8 acpi_ut_safe_strcat(char *dest, acpi_size dest_size, char *source)
 176 {
 177
 178         if ((strlen(dest) + strlen(source)) >= dest_size) {
 179                 return (TRUE);
 180         }
 181
 182         strcat(dest, source);
 183         return (FALSE);
 184 }
 185
 186 u8
 187 acpi_ut_safe_strncat(char *dest,
 188                      acpi_size dest_size,
 189                      char *source, acpi_size max_transfer_length)
 190 {
 191         acpi_size actual_transfer_length;
 192
 193         actual_transfer_length = ACPI_MIN(max_transfer_length, strlen(source));
 194
 195         if ((strlen(dest) + actual_transfer_length) >= dest_size) {
 196                 return (TRUE);
 197         }
 198
 199         strncat(dest, source, max_transfer_length);
 200         return (FALSE);
 201 }
 202
 203 void acpi_ut_safe_strncpy(char *dest, char *source, acpi_size dest_size)
 204 {
 205         /* Always terminate destination string */
 206
 207         strncpy(dest, source, dest_size);
 208         dest[dest_size - 1] = 0;
 209 }
 210
 211 #endif