// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
*
* Module Name : utnonansi - Non - ansi C library functions
*
******************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME("utnonansi" )
/*
* Non - ANSI C library functions - strlwr , strupr , stricmp , and " safe "
* string functions .
*/
/*******************************************************************************
*
* FUNCTION : acpi_ut_strlwr ( strlwr )
*
* PARAMETERS : src_string - The source string to convert
*
* RETURN : None
*
* DESCRIPTION : Convert a string to lowercase
*
******************************************************************************/
void acpi_ut_strlwr(char *src_string)
{
char *string;
ACPI_FUNCTION_ENTRY();
if (!src_string) {
return ;
}
/* Walk entire string, lowercasing the letters */
for (string = src_string; *string; string++) {
*string = (char )tolower((int )*string);
}
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_strupr ( strupr )
*
* PARAMETERS : src_string - The source string to convert
*
* RETURN : None
*
* DESCRIPTION : Convert a string to uppercase
*
******************************************************************************/
void acpi_ut_strupr(char *src_string)
{
char *string;
ACPI_FUNCTION_ENTRY();
if (!src_string) {
return ;
}
/* Walk entire string, uppercasing the letters */
for (string = src_string; *string; string++) {
*string = (char )toupper((int )*string);
}
}
/******************************************************************************
*
* FUNCTION : acpi_ut_stricmp ( stricmp )
*
* PARAMETERS : string1 - first string to compare
* string2 - second string to compare
*
* RETURN : int that signifies string relationship . Zero means strings
* are equal .
*
* DESCRIPTION : Case - insensitive string compare . Implementation of the
* non - ANSI stricmp function .
*
******************************************************************************/
int acpi_ut_stricmp(char *string1, char *string2)
{
int c1;
int c2;
do {
c1 = tolower((int )*string1);
c2 = tolower((int )*string2);
string1++;
string2++;
}
while ((c1 == c2) && (c1));
return (c1 - c2);
}
#if defined (ACPI_DEBUGGER) || defined (ACPI_APPLICATION) || defined (ACPI_DEBUG_OUTPUT)
/*******************************************************************************
*
* FUNCTION : acpi_ut_safe_strcpy , acpi_ut_safe_strcat , acpi_ut_safe_strncat
*
* PARAMETERS : Adds a " DestSize " parameter to each of the standard string
* functions . This is the size of the Destination buffer .
*
* RETURN : TRUE if the operation would overflow the destination buffer .
*
* DESCRIPTION : Safe versions of standard Clib string functions . Ensure that
* the result of the operation will not overflow the output string
* buffer .
*
* NOTE : These functions are typically only helpful for processing
* user input and command lines . For most ACPICA code , the
* required buffer length is precisely calculated before buffer
* allocation , so the use of these functions is unnecessary .
*
******************************************************************************/
u8 acpi_ut_safe_strcpy(char *dest, acpi_size dest_size, char *source)
{
if (strlen(source) >= dest_size) {
return (TRUE );
}
strcpy(dest, source);
return (FALSE );
}
u8 acpi_ut_safe_strcat(char *dest, acpi_size dest_size, char *source)
{
if ((strlen(dest) + strlen(source)) >= dest_size) {
return (TRUE );
}
strcat(dest, source);
return (FALSE );
}
u8
acpi_ut_safe_strncat(char *dest,
acpi_size dest_size,
char *source, acpi_size max_transfer_length)
{
acpi_size actual_transfer_length;
actual_transfer_length = ACPI_MIN(max_transfer_length, strlen(source));
if ((strlen(dest) + actual_transfer_length) >= dest_size) {
return (TRUE );
}
strncat(dest, source, max_transfer_length);
return (FALSE );
}
void acpi_ut_safe_strncpy(char *dest, char *source, acpi_size dest_size)
{
/* Always terminate destination string */
strncpy(dest, source, dest_size);
dest[dest_size - 1 ] = 0 ;
}
#endif
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(vorverarbeitet am 2026-10-11)
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