// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name : utprint - Formatted printing routines
*
* Copyright ( C ) 2000 - 2025 , Intel Corp .
*
*****************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME("utprint" )
#define ACPI_FORMAT_SIGN 0 x01
#define ACPI_FORMAT_SIGN_PLUS 0 x02
#define ACPI_FORMAT_SIGN_PLUS_SPACE 0 x04
#define ACPI_FORMAT_ZERO 0 x08
#define ACPI_FORMAT_LEFT 0 x10
#define ACPI_FORMAT_UPPER 0 x20
#define ACPI_FORMAT_PREFIX 0 x40
/* Local prototypes */
static acpi_size
acpi_ut_bound_string_length(const char *string, acpi_size count);
static char *acpi_ut_bound_string_output(char *string, const char *end, char c);
static char *acpi_ut_format_number(char *string,
char *end,
u64 number,
u8 base, s32 width, s32 precision, u8 type);
static char *acpi_ut_put_number(char *string, u64 number, u8 base, u8 upper);
/*******************************************************************************
*
* FUNCTION : acpi_ut_bound_string_length
*
* PARAMETERS : string - String with boundary
* count - Boundary of the string
*
* RETURN : Length of the string . Less than or equal to Count .
*
* DESCRIPTION : Calculate the length of a string with boundary .
*
******************************************************************************/
static acpi_size
acpi_ut_bound_string_length(const char *string, acpi_size count)
{
u32 length = 0 ;
while (*string && count) {
length++;
string++;
count--;
}
return (length);
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_bound_string_output
*
* PARAMETERS : string - String with boundary
* end - Boundary of the string
* c - Character to be output to the string
*
* RETURN : Updated position for next valid character
*
* DESCRIPTION : Output a character into a string with boundary check .
*
******************************************************************************/
static char *acpi_ut_bound_string_output(char *string, const char *end, char c)
{
if (string < end) {
*string = c;
}
++string;
return (string);
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_put_number
*
* PARAMETERS : string - Buffer to hold reverse - ordered string
* number - Integer to be converted
* base - Base of the integer
* upper - Whether or not using upper cased digits
*
* RETURN : Updated position for next valid character
*
* DESCRIPTION : Convert an integer into a string , note that , the string holds a
* reversed ordered number without the trailing zero .
*
******************************************************************************/
static char *acpi_ut_put_number(char *string, u64 number, u8 base, u8 upper)
{
const char *digits;
u64 digit_index;
char *pos;
pos = string;
digits = upper ? acpi_gbl_upper_hex_digits : acpi_gbl_lower_hex_digits;
if (number == 0 ) {
*(pos++) = '0' ;
} else {
while (number) {
(void )acpi_ut_divide(number, base, &number,
&digit_index);
*(pos++) = digits[digit_index];
}
}
/* *(Pos++) = '0'; */
return (pos);
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_scan_number
*
* PARAMETERS : string - String buffer
* number_ptr - Where the number is returned
*
* RETURN : Updated position for next valid character
*
* DESCRIPTION : Scan a string for a decimal integer .
*
******************************************************************************/
const char *acpi_ut_scan_number(const char *string, u64 *number_ptr)
{
u64 number = 0 ;
while (isdigit((int )*string)) {
acpi_ut_short_multiply(number, 10 , &number);
number += *(string++) - '0' ;
}
*number_ptr = number;
return (string);
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_print_number
*
* PARAMETERS : string - String buffer
* number - The number to be converted
*
* RETURN : Updated position for next valid character
*
* DESCRIPTION : Print a decimal integer into a string .
*
******************************************************************************/
const char *acpi_ut_print_number(char *string, u64 number)
{
char ascii_string[20 ];
const char *pos1;
char *pos2;
pos1 = acpi_ut_put_number(ascii_string, number, 10 , FALSE );
pos2 = string;
while (pos1 != ascii_string) {
*(pos2++) = *(--pos1);
}
*pos2 = 0 ;
return (string);
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_format_number
*
* PARAMETERS : string - String buffer with boundary
* end - Boundary of the string
* number - The number to be converted
* base - Base of the integer
* width - Field width
* precision - Precision of the integer
* type - Special printing flags
*
* RETURN : Updated position for next valid character
*
* DESCRIPTION : Print an integer into a string with any base and any precision .
*
******************************************************************************/
static char *acpi_ut_format_number(char *string,
char *end,
u64 number,
u8 base, s32 width, s32 precision, u8 type)
{
char *pos;
char sign;
char zero;
u8 need_prefix;
u8 upper;
s32 i;
char reversed_string[66 ];
/* Parameter validation */
if (base < 2 || base > 16 ) {
return (NULL);
}
if (type & ACPI_FORMAT_LEFT) {
type &= ~ACPI_FORMAT_ZERO;
}
need_prefix = ((type & ACPI_FORMAT_PREFIX)
&& base != 10 ) ? TRUE : FALSE ;
upper = (type & ACPI_FORMAT_UPPER) ? TRUE : FALSE ;
zero = (type & ACPI_FORMAT_ZERO) ? '0' : ' ' ;
/* Calculate size according to sign and prefix */
sign = '\0' ;
if (type & ACPI_FORMAT_SIGN) {
if ((s64)number < 0 ) {
sign = '-' ;
number = -(s64)number;
width--;
} else if (type & ACPI_FORMAT_SIGN_PLUS) {
sign = '+' ;
width--;
} else if (type & ACPI_FORMAT_SIGN_PLUS_SPACE) {
sign = ' ' ;
width--;
}
}
if (need_prefix) {
width--;
if (base == 16 ) {
width--;
}
}
/* Generate full string in reverse order */
pos = acpi_ut_put_number(reversed_string, number, base, upper);
i = (s32)ACPI_PTR_DIFF(pos, reversed_string);
/* Printing 100 using %2d gives "100", not "00" */
if (i > precision) {
precision = i;
}
width -= precision;
/* Output the string */
if (!(type & (ACPI_FORMAT_ZERO | ACPI_FORMAT_LEFT))) {
while (--width >= 0 ) {
string = acpi_ut_bound_string_output(string, end, ' ' );
}
}
if (sign) {
string = acpi_ut_bound_string_output(string, end, sign);
}
if (need_prefix) {
string = acpi_ut_bound_string_output(string, end, '0' );
if (base == 16 ) {
string =
acpi_ut_bound_string_output(string, end,
upper ? 'X' : 'x' );
}
}
if (!(type & ACPI_FORMAT_LEFT)) {
while (--width >= 0 ) {
string = acpi_ut_bound_string_output(string, end, zero);
}
}
while (i <= --precision) {
string = acpi_ut_bound_string_output(string, end, '0' );
}
while (--i >= 0 ) {
string = acpi_ut_bound_string_output(string, end,
reversed_string[i]);
}
while (--width >= 0 ) {
string = acpi_ut_bound_string_output(string, end, ' ' );
}
return (string);
}
/*******************************************************************************
*
* FUNCTION : vsnprintf
*
* PARAMETERS : string - String with boundary
* size - Boundary of the string
* format - Standard printf format
* args - Argument list
*
* RETURN : Number of bytes actually written .
*
* DESCRIPTION : Formatted output to a string using argument list pointer .
*
******************************************************************************/
int vsnprintf(char *string, acpi_size size, const char *format, va_list args)
{
u8 base;
u8 type;
s32 width;
s32 precision;
char qualifier;
u64 number;
char *pos;
char *end;
char c;
const char *s;
const void *p;
s32 length;
int i;
pos = string;
size = ACPI_MIN(size, ACPI_PTR_DIFF(ACPI_MAX_PTR, string));
end = string + size;
for (; *format; ++format) {
if (*format != '%' ) {
pos = acpi_ut_bound_string_output(pos, end, *format);
continue ;
}
type = 0 ;
base = 10 ;
/* Process sign */
do {
++format;
if (*format == '#' ) {
type |= ACPI_FORMAT_PREFIX;
} else if (*format == '0' ) {
type |= ACPI_FORMAT_ZERO;
} else if (*format == '+' ) {
type |= ACPI_FORMAT_SIGN_PLUS;
} else if (*format == ' ' ) {
type |= ACPI_FORMAT_SIGN_PLUS_SPACE;
} else if (*format == '-' ) {
type |= ACPI_FORMAT_LEFT;
} else {
break ;
}
} while (1 );
/* Process width */
width = -1 ;
if (isdigit((int )*format)) {
format = acpi_ut_scan_number(format, &number);
width = (s32)number;
} else if (*format == '*' ) {
++format;
width = va_arg(args, int );
if (width < 0 ) {
width = -width;
type |= ACPI_FORMAT_LEFT;
}
}
/* Process precision */
precision = -1 ;
if (*format == '.' ) {
++format;
if (isdigit((int )*format)) {
format = acpi_ut_scan_number(format, &number);
precision = (s32)number;
} else if (*format == '*' ) {
++format;
precision = va_arg(args, int );
}
if (precision < 0 ) {
precision = 0 ;
}
}
/* Process qualifier */
qualifier = -1 ;
if (*format == 'h' || *format == 'l' || *format == 'L' ) {
qualifier = *format;
++format;
if (qualifier == 'l' && *format == 'l' ) {
qualifier = 'L' ;
++format;
}
}
switch (*format) {
case '%' :
pos = acpi_ut_bound_string_output(pos, end, '%' );
continue ;
case 'c' :
if (!(type & ACPI_FORMAT_LEFT)) {
while (--width > 0 ) {
pos =
acpi_ut_bound_string_output(pos,
end,
' ' );
}
}
c = (char )va_arg(args, int );
pos = acpi_ut_bound_string_output(pos, end, c);
while (--width > 0 ) {
pos =
acpi_ut_bound_string_output(pos, end, ' ' );
}
continue ;
case 's' :
s = va_arg(args, char *);
if (!s) {
s = "<NULL>" ;
}
length = (s32)acpi_ut_bound_string_length(s, precision);
if (!(type & ACPI_FORMAT_LEFT)) {
while (length < width--) {
pos =
acpi_ut_bound_string_output(pos,
end,
' ' );
}
}
for (i = 0 ; i < length; ++i) {
pos = acpi_ut_bound_string_output(pos, end, *s);
++s;
}
while (length < width--) {
pos =
acpi_ut_bound_string_output(pos, end, ' ' );
}
continue ;
case 'o' :
base = 8 ;
break ;
case 'X' :
type |= ACPI_FORMAT_UPPER;
ACPI_FALLTHROUGH;
case 'x' :
base = 16 ;
break ;
case 'd' :
case 'i' :
type |= ACPI_FORMAT_SIGN;
case 'u' :
break ;
case 'p' :
if (width == -1 ) {
width = 2 * sizeof (void *);
type |= ACPI_FORMAT_ZERO;
}
p = va_arg(args, void *);
pos =
acpi_ut_format_number(pos, end, ACPI_TO_INTEGER(p),
16 , width, precision, type);
continue ;
default :
pos = acpi_ut_bound_string_output(pos, end, '%' );
if (*format) {
pos =
acpi_ut_bound_string_output(pos, end,
*format);
} else {
--format;
}
continue ;
}
if (qualifier == 'L' ) {
number = va_arg(args, u64);
if (type & ACPI_FORMAT_SIGN) {
number = (s64)number;
}
} else if (qualifier == 'l' ) {
number = va_arg(args, unsigned long );
if (type & ACPI_FORMAT_SIGN) {
number = (s32)number;
}
} else if (qualifier == 'h' ) {
number = (u16)va_arg(args, int );
if (type & ACPI_FORMAT_SIGN) {
number = (s16)number;
}
} else {
number = va_arg(args, unsigned int );
if (type & ACPI_FORMAT_SIGN) {
number = (signed int )number;
}
}
pos = acpi_ut_format_number(pos, end, number, base,
width, precision, type);
}
if (size > 0 ) {
if (pos < end) {
*pos = '\0' ;
} else {
end[-1 ] = '\0' ;
}
}
return ((int )ACPI_PTR_DIFF(pos, string));
}
/*******************************************************************************
*
* FUNCTION : snprintf
*
* PARAMETERS : string - String with boundary
* size - Boundary of the string
* Format , . . . - Standard printf format
*
* RETURN : Number of bytes actually written .
*
* DESCRIPTION : Formatted output to a string .
*
******************************************************************************/
int snprintf(char *string, acpi_size size, const char *format, ...)
{
va_list args;
int length;
va_start(args, format);
length = vsnprintf(string, size, format, args);
va_end(args);
return (length);
}
/*******************************************************************************
*
* FUNCTION : sprintf
*
* PARAMETERS : string - String with boundary
* Format , . . . - Standard printf format
*
* RETURN : Number of bytes actually written .
*
* DESCRIPTION : Formatted output to a string .
*
******************************************************************************/
int sprintf(char *string, const char *format, ...)
{
va_list args;
int length;
va_start(args, format);
length = vsnprintf(string, ACPI_UINT32_MAX, format, args);
va_end(args);
return (length);
}
#ifdef ACPI_APPLICATION
/*******************************************************************************
*
* FUNCTION : vprintf
*
* PARAMETERS : format - Standard printf format
* args - Argument list
*
* RETURN : Number of bytes actually written .
*
* DESCRIPTION : Formatted output to stdout using argument list pointer .
*
******************************************************************************/
int vprintf(const char *format, va_list args)
{
acpi_cpu_flags flags;
int length;
flags = acpi_os_acquire_lock(acpi_gbl_print_lock);
length = vsnprintf(acpi_gbl_print_buffer,
sizeof (acpi_gbl_print_buffer), format, args);
(void )fwrite(acpi_gbl_print_buffer, length, 1 , ACPI_FILE_OUT);
acpi_os_release_lock(acpi_gbl_print_lock, flags);
return (length);
}
/*******************************************************************************
*
* FUNCTION : printf
*
* PARAMETERS : Format , . . . - Standard printf format
*
* RETURN : Number of bytes actually written .
*
* DESCRIPTION : Formatted output to stdout .
*
******************************************************************************/
int printf(const char *format, ...)
{
va_list args;
int length;
va_start(args, format);
length = vprintf(format, args);
va_end(args);
return (length);
}
/*******************************************************************************
*
* FUNCTION : vfprintf
*
* PARAMETERS : file - File descriptor
* format - Standard printf format
* args - Argument list
*
* RETURN : Number of bytes actually written .
*
* DESCRIPTION : Formatted output to a file using argument list pointer .
*
******************************************************************************/
int vfprintf(FILE * file, const char *format, va_list args)
{
acpi_cpu_flags flags;
int length;
flags = acpi_os_acquire_lock(acpi_gbl_print_lock);
length = vsnprintf(acpi_gbl_print_buffer,
sizeof (acpi_gbl_print_buffer), format, args);
(void )fwrite(acpi_gbl_print_buffer, length, 1 , file);
acpi_os_release_lock(acpi_gbl_print_lock, flags);
return (length);
}
/*******************************************************************************
*
* FUNCTION : fprintf
*
* PARAMETERS : file - File descriptor
* Format , . . . - Standard printf format
*
* RETURN : Number of bytes actually written .
*
* DESCRIPTION : Formatted output to a file .
*
******************************************************************************/
int fprintf(FILE * file, const char *format, ...)
{
va_list args;
int length;
va_start(args, format);
length = vfprintf(file, format, args);
va_end(args);
return (length);
}
#endif
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