xref: /openbmc/linux/drivers/acpi/acpica/utstring.c (revision 7ae9fb1b7ecbb5d85d07857943f677fd1a559b18)

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
 *
 * Module Name: utstring - Common functions for strings and characters
 *
 ******************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utstring")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_print_string
 *
 * PARAMETERS:  string          - Null terminated ASCII string
 *              max_length      - Maximum output length. Used to constrain the
 *                                length of strings during debug output only.
 *
 * RETURN:      None
 *
 * DESCRIPTION: Dump an ASCII string with support for ACPI-defined escape
 *              sequences.
 *
 ******************************************************************************/
void acpi_ut_print_string(char *string, u16 max_length)
{
	u32 i;

	if (!string) {
		acpi_os_printf("<\"NULL STRING PTR\">");
		return;
	}

	acpi_os_printf("\"");
	for (i = 0; (i < max_length) && string[i]; i++) {

		/* Escape sequences */

		switch (string[i]) {
		case 0x07:

			acpi_os_printf("\\a");	/* BELL */
			break;

		case 0x08:

			acpi_os_printf("\\b");	/* BACKSPACE */
			break;

		case 0x0C:

			acpi_os_printf("\\f");	/* FORMFEED */
			break;

		case 0x0A:

			acpi_os_printf("\\n");	/* LINEFEED */
			break;

		case 0x0D:

			acpi_os_printf("\\r");	/* CARRIAGE RETURN */
			break;

		case 0x09:

			acpi_os_printf("\\t");	/* HORIZONTAL TAB */
			break;

		case 0x0B:

			acpi_os_printf("\\v");	/* VERTICAL TAB */
			break;

		case '\'':	/* Single Quote */
		case '\"':	/* Double Quote */
		case '\\':	/* Backslash */

			acpi_os_printf("\\%c", (int)string[i]);
			break;

		default:

			/* Check for printable character or hex escape */

			if (isprint((int)string[i])) {
				/* This is a normal character */

				acpi_os_printf("%c", (int)string[i]);
			} else {
				/* All others will be Hex escapes */

				acpi_os_printf("\\x%2.2X", (s32)string[i]);
			}
			break;
		}
	}

	acpi_os_printf("\"");

	if (i == max_length && string[i]) {
		acpi_os_printf("...");
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_repair_name
 *
 * PARAMETERS:  name            - The ACPI name to be repaired
 *
 * RETURN:      Repaired version of the name
 *
 * DESCRIPTION: Repair an ACPI name: Change invalid characters to '*' and
 *              return the new name. NOTE: the Name parameter must reside in
 *              read/write memory, cannot be a const.
 *
 * An ACPI Name must consist of valid ACPI characters. We will repair the name
 * if necessary because we don't want to abort because of this, but we want
 * all namespace names to be printable. A warning message is appropriate.
 *
 * This issue came up because there are in fact machines that exhibit
 * this problem, and we want to be able to enable ACPI support for them,
 * even though there are a few bad names.
 *
 ******************************************************************************/

void acpi_ut_repair_name(char *name)
{
	u32 i;
	u8 found_bad_char = FALSE;
	u32 original_name;

	ACPI_FUNCTION_NAME(ut_repair_name);

	/*
	 * Special case for the root node. This can happen if we get an
	 * error during the execution of module-level code.
	 */
	if (ACPI_COMPARE_NAMESEG(name, ACPI_ROOT_PATHNAME)) {
		return;
	}

	ACPI_COPY_NAMESEG(&original_name, &name[0]);

	/* Check each character in the name */

	for (i = 0; i < ACPI_NAMESEG_SIZE; i++) {
		if (acpi_ut_valid_name_char(name[i], i)) {
			continue;
		}

		/*
		 * Replace a bad character with something printable, yet technically
		 * "odd". This prevents any collisions with existing "good"
		 * names in the namespace.
		 */
		name[i] = '_';
		found_bad_char = TRUE;
	}

	if (found_bad_char) {

		/* Report warning only if in strict mode or debug mode */

		if (!acpi_gbl_enable_interpreter_slack) {
			ACPI_WARNING((AE_INFO,
				      "Invalid character(s) in name (0x%.8X) %p, repaired: [%4.4s]",
				      original_name, name, &name[0]));
		} else {
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Invalid character(s) in name (0x%.8X), repaired: [%4.4s]",
					  original_name, name));
		}
	}
}

#if defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP
/*******************************************************************************
 *
 * FUNCTION:    ut_convert_backslashes
 *
 * PARAMETERS:  pathname        - File pathname string to be converted
 *
 * RETURN:      Modifies the input Pathname
 *
 * DESCRIPTION: Convert all backslashes (0x5C) to forward slashes (0x2F) within
 *              the entire input file pathname string.
 *
 ******************************************************************************/

void ut_convert_backslashes(char *pathname)
{

	if (!pathname) {
		return;
	}

	while (*pathname) {
		if (*pathname == '\\') {
			*pathname = '/';
		}

		pathname++;
	}
}
#endif