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