coreboot-kgpe-d16/payloads/libpayload/libc/printf.c

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/*
* This file is part of the libpayload project.
*
* It has originally been taken from the HelenOS project
* (http://www.helenos.eu), and slightly modified for our purposes.
*
* Copyright (C) 2001-2004 Jakub Jermar
* Copyright (C) 2006 Josef Cejka
* Copyright (C) 2008 Uwe Hermann <uwe@hermann-uwe.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <libpayload.h>
#include <stdarg.h>
/** Structure for specifying output methods for different printf clones. */
struct printf_spec {
/* Output function, returns count of printed characters or EOF. */
int (*write) (void *, size_t, void *);
/* Support data - output stream specification, its state, locks, ... */
void *data;
};
/** Show prefixes 0x or 0. */
#define __PRINTF_FLAG_PREFIX 0x00000001
/** Signed / unsigned number. */
#define __PRINTF_FLAG_SIGNED 0x00000002
/** Print leading zeroes. */
#define __PRINTF_FLAG_ZEROPADDED 0x00000004
/** Align to left. */
#define __PRINTF_FLAG_LEFTALIGNED 0x00000010
/** Always show + sign. */
#define __PRINTF_FLAG_SHOWPLUS 0x00000020
/** Print space instead of plus. */
#define __PRINTF_FLAG_SPACESIGN 0x00000040
/** Show big characters. */
#define __PRINTF_FLAG_BIGCHARS 0x00000080
/** Number has - sign. */
#define __PRINTF_FLAG_NEGATIVE 0x00000100
/**
* Buffer big enough for 64-bit number printed in base 2, sign, prefix and 0
* to terminate string (last one is only for better testing end of buffer by
* zero-filling subroutine).
*/
#define PRINT_NUMBER_BUFFER_SIZE (64 + 5)
/** Enumeration of possible arguments types. */
typedef enum {
PrintfQualifierByte = 0,
PrintfQualifierShort,
PrintfQualifierInt,
PrintfQualifierLong,
PrintfQualifierLongLong,
PrintfQualifierPointer,
} qualifier_t;
static char digits_small[] = "0123456789abcdef";
static char digits_big[] = "0123456789ABCDEF";
/**
* Print one or more characters without adding newline.
*
* @param buf Buffer of >= count bytesi size. NULL pointer is not allowed!
* @param count Number of characters to print.
* @param ps Output method and its data.
* @return Number of characters printed.
*/
static int printf_putnchars(const char *buf, size_t count,
struct printf_spec *ps)
{
return ps->write((void *)buf, count, ps->data);
}
/**
* Print a string without adding a newline.
*
* @param str String to print.
* @param ps Write function specification and support data.
* @return Number of characters printed.
*/
static int printf_putstr(const char *str, struct printf_spec *ps)
{
size_t count;
if (str == NULL) {
char *nullstr = "(NULL)";
return printf_putnchars(nullstr, strlen(nullstr), ps);
}
count = strlen(str);
return ps->write((void *)str, count, ps->data);
}
/**
* Print one character.
*
* @param c Character to be printed.
* @param ps Output method.
* @return Number of characters printed.
*/
static int printf_putchar(int c, struct printf_spec *ps)
{
unsigned char ch = c;
return ps->write((void *)&ch, 1, ps->data);
}
/**
* Print one formatted character.
*
* @param c Character to print.
* @param width Width modifier.
* @param flags Flags that change the way the character is printed.
* @return Number of characters printed, negative value on failure.
*/
static int print_char(char c, int width, uint64_t flags, struct printf_spec *ps)
{
int counter = 0;
if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
while (--width > 0) {
if (printf_putchar(' ', ps) > 0)
++counter;
}
}
if (printf_putchar(c, ps) > 0)
counter++;
while (--width > 0) {
if (printf_putchar(' ', ps) > 0)
++counter;
}
return ++counter;
}
/**
* Print string.
*
* @param s String to be printed.
* @param width Width modifier.
* @param precision Precision modifier.
* @param flags Flags that modify the way the string is printed.
* @return Number of characters printed, negative value on failure.
*/
static int print_string(char *s, int width, unsigned int precision,
uint64_t flags, struct printf_spec *ps)
{
int counter = 0, retval;
size_t size;
if (s == NULL)
return printf_putstr("(NULL)", ps);
size = strlen(s);
/* Print leading spaces. */
if (precision == 0)
precision = size;
width -= precision;
if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
while (width-- > 0) {
if (printf_putchar(' ', ps) == 1)
counter++;
}
}
if ((retval = printf_putnchars(s, MIN(size, precision), ps)) < 0)
return -counter;
counter += retval;
while (width-- > 0) {
if (printf_putchar(' ', ps) == 1)
++counter;
}
return counter;
}
/**
* Print a number in a given base.
*
* Print significant digits of a number in given base.
*
* @param num Number to print.
* @param widt Width modifier.h
* @param precision Precision modifier.
* @param base Base to print the number in (must be between 2 and 16).
* @param flags Flags that modify the way the number is printed.
* @return Number of characters printed.
*/
static int print_number(uint64_t num, int width, int precision, int base,
uint64_t flags, struct printf_spec *ps)
{
char *digits = digits_small;
char d[PRINT_NUMBER_BUFFER_SIZE];
char *ptr = &d[PRINT_NUMBER_BUFFER_SIZE - 1];
int size = 0; /* Size of number with all prefixes and signs. */
int number_size; /* Size of plain number. */
char sgn;
int retval;
int counter = 0;
if (flags & __PRINTF_FLAG_BIGCHARS)
digits = digits_big;
*ptr-- = 0; /* Put zero at end of string. */
if (num == 0) {
*ptr-- = '0';
size++;
} else {
do {
*ptr-- = digits[num % base];
size++;
} while (num /= base);
}
number_size = size;
/*
* Collect the sum of all prefixes/signs/... to calculate padding and
* leading zeroes.
*/
if (flags & __PRINTF_FLAG_PREFIX) {
switch (base) {
case 2: /* Binary formating is not standard, but useful. */
size += 2;
break;
case 8:
size++;
break;
case 16:
size += 2;
break;
}
}
sgn = 0;
if (flags & __PRINTF_FLAG_SIGNED) {
if (flags & __PRINTF_FLAG_NEGATIVE) {
sgn = '-';
size++;
} else if (flags & __PRINTF_FLAG_SHOWPLUS) {
sgn = '+';
size++;
} else if (flags & __PRINTF_FLAG_SPACESIGN) {
sgn = ' ';
size++;
}
}
if (flags & __PRINTF_FLAG_LEFTALIGNED)
flags &= ~__PRINTF_FLAG_ZEROPADDED;
/*
* If the number is leftaligned or precision is specified then
* zeropadding is ignored.
*/
if (flags & __PRINTF_FLAG_ZEROPADDED) {
if ((precision == 0) && (width > size))
precision = width - size + number_size;
}
/* Print leading spaces. */
if (number_size > precision) {
/* Print the whole number not only a part. */
precision = number_size;
}
width -= precision + size - number_size;
if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
while (width-- > 0) {
if (printf_putchar(' ', ps) == 1)
counter++;
}
}
/* Print sign. */
if (sgn) {
if (printf_putchar(sgn, ps) == 1)
counter++;
}
/* Print prefix. */
if (flags & __PRINTF_FLAG_PREFIX) {
switch (base) {
case 2: /* Binary formating is not standard, but useful. */
if (printf_putchar('0', ps) == 1)
counter++;
if (flags & __PRINTF_FLAG_BIGCHARS) {
if (printf_putchar('B', ps) == 1)
counter++;
} else {
if (printf_putchar('b', ps) == 1)
counter++;
}
break;
case 8:
if (printf_putchar('o', ps) == 1)
counter++;
break;
case 16:
if (printf_putchar('0', ps) == 1)
counter++;
if (flags & __PRINTF_FLAG_BIGCHARS) {
if (printf_putchar('X', ps) == 1)
counter++;
} else {
if (printf_putchar('x', ps) == 1)
counter++;
}
break;
}
}
/* Print leading zeroes. */
precision -= number_size;
while (precision-- > 0) {
if (printf_putchar('0', ps) == 1)
counter++;
}
/* Print number itself. */
if ((retval = printf_putstr(++ptr, ps)) > 0)
counter += retval;
/* Print ending spaces. */
while (width-- > 0) {
if (printf_putchar(' ', ps) == 1)
counter++;
}
return counter;
}
/** Print formatted string.
*
* Print string formatted according to the fmt parameter and variadic arguments.
* Each formatting directive must have the following form:
*
* \% [ FLAGS ] [ WIDTH ] [ .PRECISION ] [ TYPE ] CONVERSION
*
* FLAGS:@n
* - "#" Force to print prefix.For \%o conversion, the prefix is 0, for
* \%x and \%X prefixes are 0x and 0X and for conversion \%b the
* prefix is 0b.
*
* - "-" Align to left.
*
* - "+" Print positive sign just as negative.
*
* - " " If the printed number is positive and "+" flag is not set,
* print space in place of sign.
*
* - "0" Print 0 as padding instead of spaces. Zeroes are placed between
* sign and the rest of the number. This flag is ignored if "-"
* flag is specified.
*
* WIDTH:@n
* - Specify the minimal width of a printed argument. If it is bigger,
* width is ignored. If width is specified with a "*" character instead of
* number, width is taken from parameter list. And integer parameter is
* expected before parameter for processed conversion specification. If
* this value is negative its absolute value is taken and the "-" flag is
* set.
*
* PRECISION:@n
* - Value precision. For numbers it specifies minimum valid numbers.
* Smaller numbers are printed with leading zeroes. Bigger numbers are not
* affected. Strings with more than precision characters are cut off. Just
* as with width, an "*" can be used used instead of a number. An integer
* value is then expected in parameters. When both width and precision are
* specified using "*", the first parameter is used for width and the
* second one for precision.
*
* TYPE:@n
* - "hh" Signed or unsigned char.@n
* - "h" Signed or unsigned short.@n
* - "" Signed or unsigned int (default value).@n
* - "l" Signed or unsigned long int.@n
* - "ll" Signed or unsigned long long int.@n
*
*
* CONVERSION:@n
* - % Print percentile character itself.
*
* - c Print single character.
*
* - s Print zero terminated string. If a NULL value is passed as
* value, "(NULL)" is printed instead.
*
* - P, p Print value of a pointer. Void * value is expected and it is
* printed in hexadecimal notation with prefix (as with \%#X / \%#x
* for 32-bit or \%#X / \%#x for 64-bit long pointers).
*
* - b Print value as unsigned binary number. Prefix is not printed by
* default. (Nonstandard extension.)
*
* - o Print value as unsigned octal number. Prefix is not printed by
* default.
*
* - d, i Print signed decimal number. There is no difference between d
* and i conversion.
*
* - u Print unsigned decimal number.
*
* - X, x Print hexadecimal number with upper- or lower-case. Prefix is
* not printed by default.
*
* All other characters from fmt except the formatting directives are printed in
* verbatim.
*
* @param fmt Formatting NULL terminated string.
* @param ps TODO.
* @param ap TODO.
* @return Number of characters printed, negative value on failure.
*/
static int printf_core(const char *fmt, struct printf_spec *ps, va_list ap)
{
int i = 0; /* Index of the currently processed char from fmt */
int j = 0; /* Index to the first not printed nonformating character */
int end;
int counter; /* Counter of printed characters */
int retval; /* Used to store return values from called functions */
char c;
qualifier_t qualifier; /* Type of argument */
int base; /* Base in which a numeric parameter will be printed */
uint64_t number; /* Argument value */
size_t size; /* Byte size of integer parameter */
int width, precision;
uint64_t flags;
counter = 0;
while ((c = fmt[i])) {
/* Control character. */
if (c == '%') {
/* Print common characters if any processed. */
if (i > j) {
if ((retval = printf_putnchars(&fmt[j],
(size_t) (i - j), ps)) < 0) {
counter = -counter;
goto out; /* Error */
}
counter += retval;
}
j = i;
/* Parse modifiers. */
flags = 0;
end = 0;
do {
++i;
switch (c = fmt[i]) {
case '#':
flags |= __PRINTF_FLAG_PREFIX;
break;
case '-':
flags |= __PRINTF_FLAG_LEFTALIGNED;
break;
case '+':
flags |= __PRINTF_FLAG_SHOWPLUS;
break;
case ' ':
flags |= __PRINTF_FLAG_SPACESIGN;
break;
case '0':
flags |= __PRINTF_FLAG_ZEROPADDED;
break;
default:
end = 1;
};
} while (end == 0);
/* Width & '*' operator. */
width = 0;
if (isdigit(fmt[i])) {
while (isdigit(fmt[i])) {
width *= 10;
width += fmt[i++] - '0';
}
} else if (fmt[i] == '*') {
/* Get width value from argument list. */
i++;
width = (int)va_arg(ap, int);
if (width < 0) {
/* Negative width sets '-' flag. */
width *= -1;
flags |= __PRINTF_FLAG_LEFTALIGNED;
}
}
/* Precision and '*' operator. */
precision = 0;
if (fmt[i] == '.') {
++i;
if (isdigit(fmt[i])) {
while (isdigit(fmt[i])) {
precision *= 10;
precision += fmt[i++] - '0';
}
} else if (fmt[i] == '*') {
/* Get precision from argument list. */
i++;
precision = (int)va_arg(ap, int);
/* Ignore negative precision. */
if (precision < 0)
precision = 0;
}
}
switch (fmt[i++]) {
/** @todo unimplemented qualifiers:
* t ptrdiff_t - ISO C 99
*/
case 'h': /* char or short */
qualifier = PrintfQualifierShort;
if (fmt[i] == 'h') {
i++;
qualifier = PrintfQualifierByte;
}
break;
case 'l': /* long or long long */
qualifier = PrintfQualifierLong;
if (fmt[i] == 'l') {
i++;
qualifier = PrintfQualifierLongLong;
}
break;
default:
/* default type */
qualifier = PrintfQualifierInt;
--i;
}
base = 10;
switch (c = fmt[i]) {
/* String and character conversions */
case 's':
if ((retval = print_string(va_arg(ap, char *),
width, precision, flags, ps)) < 0) {
counter = -counter;
goto out;
};
counter += retval;
j = i + 1;
goto next_char;
case 'c':
c = va_arg(ap, unsigned int);
retval = print_char(c, width, flags, ps);
if (retval < 0) {
counter = -counter;
goto out;
};
counter += retval;
j = i + 1;
goto next_char;
/* Integer values */
case 'P': /* pointer */
flags |= __PRINTF_FLAG_BIGCHARS;
case 'p':
flags |= __PRINTF_FLAG_PREFIX;
base = 16;
qualifier = PrintfQualifierPointer;
break;
case 'b':
base = 2;
break;
case 'o':
base = 8;
break;
case 'd':
case 'i':
flags |= __PRINTF_FLAG_SIGNED;
case 'u':
break;
case 'X':
flags |= __PRINTF_FLAG_BIGCHARS;
case 'x':
base = 16;
break;
case '%': /* percentile itself */
j = i;
goto next_char;
default: /* Bad formatting */
/*
* Unknown format. Now, j is the index of '%'
* so we will print whole bad format sequence.
*/
goto next_char;
}
/* Print integers. */
/* Print number. */
switch (qualifier) {
case PrintfQualifierByte:
size = sizeof(unsigned char);
number = (uint64_t) va_arg(ap, unsigned int);
break;
case PrintfQualifierShort:
size = sizeof(unsigned short);
number = (uint64_t) va_arg(ap, unsigned int);
break;
case PrintfQualifierInt:
size = sizeof(unsigned int);
number = (uint64_t) va_arg(ap, unsigned int);
break;
case PrintfQualifierLong:
size = sizeof(unsigned long);
number = (uint64_t) va_arg(ap, unsigned long);
break;
case PrintfQualifierLongLong:
size = sizeof(unsigned long long);
number = (uint64_t) va_arg(ap, unsigned long long);
break;
case PrintfQualifierPointer:
size = sizeof(void *);
number = (uint64_t) (unsigned long)va_arg(ap, void *);
break;
default: /* Unknown qualifier */
counter = -counter;
goto out;
}
if (flags & __PRINTF_FLAG_SIGNED) {
if (number & (0x1 << (size * 8 - 1))) {
flags |= __PRINTF_FLAG_NEGATIVE;
if (size == sizeof(uint64_t)) {
number = -((int64_t) number);
} else {
number = ~number;
number &= ~(0xFFFFFFFFFFFFFFFFll << (size * 8));
number++;
}
}
}
if ((retval = print_number(number, width, precision,
base, flags, ps)) < 0) {
counter = -counter;
goto out;
}
counter += retval;
j = i + 1;
}
next_char:
++i;
}
if (i > j) {
if ((retval = printf_putnchars(&fmt[j],
(u64) (i - j), ps)) < 0) {
counter = -counter;
goto out; /* Error */
}
counter += retval;
}
out:
return counter;
}
int sprintf(char *str, const char *fmt, ...)
{
int ret;
va_list args;
va_start(args, fmt);
ret = vsprintf(str, fmt, args);
va_end(args);
return ret;
}
struct vsnprintf_data {
size_t size; /* Total space for string */
size_t len; /* Count of currently used characters */
char *string; /* Destination string */
};
/**
* Write string to given buffer.
*
* Write at most data->size characters including trailing zero. According to
* C99, snprintf() has to return number of characters that would have been
* written if enough space had been available. Hence the return value is not
* number of really printed characters but size of the input string.
* Number of really used characters is stored in data->len.
*
* @param str Source string to print.
* @param count Size of source string.
* @param data Structure with destination string, counter of used space
* and total string size.
* @return Number of characters to print (not characters really printed!).
*/
static int vsnprintf_write(const char *str, size_t count,
struct vsnprintf_data *data)
{
size_t i;
i = data->size - data->len;
if (i == 0)
return count;
/* We have only one free byte left in buffer => write trailing zero. */
if (i == 1) {
data->string[data->size - 1] = 0;
data->len = data->size;
return count;
}
/*
* We have not enough space for whole string with the trailing
* zero => print only a part of string.
*/
if (i <= count) {
memcpy((void *)(data->string + data->len), (void *)str, i - 1);
data->string[data->size - 1] = 0;
data->len = data->size;
return count;
}
/* Buffer is big enough to print whole string. */
memcpy((void *)(data->string + data->len), (void *)str, count);
data->len += count;
/*
* Put trailing zero at end, but not count it into data->len so
* it could be rewritten next time.
*/
data->string[data->len] = 0;
return count;
}
int vsnprintf(char *str, size_t size, const char *fmt, va_list ap)
{
struct vsnprintf_data data = { size, 0, str };
struct printf_spec ps =
{ (int (*)(void *, size_t, void *))vsnprintf_write, &data };
/* Print 0 at end of string - fix case that nothing will be printed. */
if (size > 0)
str[0] = 0;
/* vsnprintf_write() ensures that str will be terminated by zero. */
return printf_core(fmt, &ps, ap);
}
int vsprintf(char *str, const char *fmt, va_list ap)
{
return vsnprintf(str, (size_t) - 1, fmt, ap);
}
int printf(const char *fmt, ...)
{
int ret;
va_list args;
va_start(args, fmt);
ret = vprintf(fmt, args);
va_end(args);
return ret;
}
static int vprintf_write(const char *str, size_t count, void *unused)
{
size_t i;
for (i = 0; i < count; i++)
putchar(str[i]);
return i;
}
int vprintf(const char *fmt, va_list ap)
{
struct printf_spec ps =
{ (int (*)(void *, size_t, void *))vprintf_write, NULL };
return printf_core(fmt, &ps, ap);
}