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ladybird/AK/PrintfImplementation.h
Sergey Bugaev 9e046bcef1 AK: Fix printf("%c", 0) 
It was me who has broken this, sorry ;(
2020-06-06 14:42:31 +02:00

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/LogStream.h>
#include <AK/StdLibExtras.h>
#include <AK/Types.h>
#include <stdarg.h>
static constexpr const char* printf_hex_digits_lower = "0123456789abcdef";
static constexpr const char* printf_hex_digits_upper = "0123456789ABCDEF";
#ifdef __serenity__
extern "C" size_t strlen(const char*);
#else
# include <string.h>
#endif
template<typename PutChFunc, typename T>
ALWAYS_INLINE int print_hex(PutChFunc putch, char*& bufptr, T number, bool upper_case, bool alternate_form, bool left_pad, bool zero_pad, u8 field_width)
{
int ret = 0;
int digits = 0;
for (T n = number; n > 0; n >>= 4)
++digits;
if (digits == 0)
digits = 1;
if (left_pad) {
int stop_at = field_width - digits;
if (alternate_form)
stop_at -= 2;
while (ret < stop_at) {
putch(bufptr, ' ');
++ret;
}
}
if (alternate_form) {
putch(bufptr, '0');
putch(bufptr, 'x');
ret += 2;
field_width += 2;
}
if (zero_pad) {
while (ret < field_width - digits) {
putch(bufptr, '0');
++ret;
}
}
if (number == 0) {
putch(bufptr, '0');
++ret;
} else {
u8 shift_count = digits * 4;
while (shift_count) {
shift_count -= 4;
putch(bufptr,
upper_case
? printf_hex_digits_upper[(number >> shift_count) & 0x0f]
: printf_hex_digits_lower[(number >> shift_count) & 0x0f]);
++ret;
}
}
return ret;
}
template<typename PutChFunc>
ALWAYS_INLINE int print_number(PutChFunc putch, char*& bufptr, u32 number, bool left_pad, bool zero_pad, u32 field_width)
{
u32 divisor = 1000000000;
char ch;
char padding = 1;
char buf[16];
char* p = buf;
for (;;) {
ch = '0' + (number / divisor);
number %= divisor;
if (ch != '0')
padding = 0;
if (!padding || divisor == 1)
*(p++) = ch;
if (divisor == 1)
break;
divisor /= 10;
}
size_t numlen = p - buf;
if (!field_width || field_width < numlen)
field_width = numlen;
if (!left_pad) {
for (unsigned i = 0; i < field_width - numlen; ++i) {
putch(bufptr, zero_pad ? '0' : ' ');
}
}
for (unsigned i = 0; i < numlen; ++i) {
putch(bufptr, buf[i]);
}
if (left_pad) {
for (unsigned i = 0; i < field_width - numlen; ++i) {
putch(bufptr, ' ');
}
}
return field_width;
}
template<typename PutChFunc>
ALWAYS_INLINE int print_u64(PutChFunc putch, char*& bufptr, u64 number, bool left_pad, bool zero_pad, u32 field_width)
{
u64 divisor = 10000000000000000000LLU;
char ch;
char padding = 1;
char buf[16];
char* p = buf;
for (;;) {
ch = '0' + (number / divisor);
number %= divisor;
if (ch != '0')
padding = 0;
if (!padding || divisor == 1)
*(p++) = ch;
if (divisor == 1)
break;
divisor /= 10;
}
size_t numlen = p - buf;
if (!field_width || field_width < numlen)
field_width = numlen;
if (!left_pad) {
for (unsigned i = 0; i < field_width - numlen; ++i) {
putch(bufptr, zero_pad ? '0' : ' ');
}
}
for (unsigned i = 0; i < numlen; ++i) {
putch(bufptr, buf[i]);
}
if (left_pad) {
for (unsigned i = 0; i < field_width - numlen; ++i) {
putch(bufptr, ' ');
}
}
return field_width;
}
template<typename PutChFunc>
ALWAYS_INLINE int print_double(PutChFunc putch, char*& bufptr, double number, bool left_pad, bool zero_pad, u32 field_width, u32 fraction_length = 6)
{
int length = 0;
if (number < 0) {
putch(bufptr, '-');
length++;
number = 0 - number;
}
length = print_u64(putch, bufptr, (i64)number, left_pad, zero_pad, field_width);
putch(bufptr, '.');
length++;
double fraction = number - (i64)number;
for (u32 i = 0; i < fraction_length; ++i)
fraction = fraction * 10;
return length + print_u64(putch, bufptr, (i64)fraction, false, true, fraction_length);
}
template<typename PutChFunc>
ALWAYS_INLINE int print_i64(PutChFunc putch, char*& bufptr, i64 number, bool left_pad, bool zero_pad, u32 field_width)
{
if (number < 0) {
putch(bufptr, '-');
return print_u64(putch, bufptr, 0 - number, left_pad, zero_pad, field_width) + 1;
}
return print_u64(putch, bufptr, number, left_pad, zero_pad, field_width);
}
template<typename PutChFunc>
ALWAYS_INLINE int print_octal_number(PutChFunc putch, char*& bufptr, u32 number, bool left_pad, bool zero_pad, u32 field_width)
{
u32 divisor = 134217728;
char ch;
char padding = 1;
char buf[32];
char* p = buf;
for (;;) {
ch = '0' + (number / divisor);
number %= divisor;
if (ch != '0')
padding = 0;
if (!padding || divisor == 1)
*(p++) = ch;
if (divisor == 1)
break;
divisor /= 8;
}
size_t numlen = p - buf;
if (!field_width || field_width < numlen)
field_width = numlen;
if (!left_pad) {
for (unsigned i = 0; i < field_width - numlen; ++i) {
putch(bufptr, zero_pad ? '0' : ' ');
}
}
for (unsigned i = 0; i < numlen; ++i) {
putch(bufptr, buf[i]);
}
if (left_pad) {
for (unsigned i = 0; i < field_width - numlen; ++i) {
putch(bufptr, ' ');
}
}
return field_width;
}
template<typename PutChFunc>
ALWAYS_INLINE int print_string(PutChFunc putch, char*& bufptr, const char* str, size_t len, bool left_pad, size_t field_width, bool dot)
{
if (!dot && (!field_width || field_width < len))
field_width = len;
size_t pad_amount = field_width > len ? field_width - len : 0;
if (!left_pad) {
for (size_t i = 0; i < pad_amount; ++i)
putch(bufptr, ' ');
}
for (size_t i = 0; i < min(len, field_width); ++i) {
putch(bufptr, str[i]);
}
if (left_pad) {
for (size_t i = 0; i < pad_amount; ++i)
putch(bufptr, ' ');
}
return field_width;
}
template<typename PutChFunc>
ALWAYS_INLINE int print_signed_number(PutChFunc putch, char*& bufptr, int number, bool left_pad, bool zero_pad, u32 field_width, bool always_sign)
{
if (number < 0) {
putch(bufptr, '-');
return print_number(putch, bufptr, 0 - number, left_pad, zero_pad, field_width) + 1;
}
if (always_sign)
putch(bufptr, '+');
return print_number(putch, bufptr, number, left_pad, zero_pad, field_width);
}
template<typename PutChFunc>
ALWAYS_INLINE int printf_internal(PutChFunc putch, char* buffer, const char*& fmt, va_list ap)
{
const char* p;
int ret = 0;
char* bufptr = buffer;
for (p = fmt; *p; ++p) {
bool left_pad = false;
bool zero_pad = false;
bool dot = false;
unsigned field_width = 0;
unsigned fraction_length = 0;
unsigned long_qualifiers = 0;
bool size_qualifier = false;
(void)size_qualifier;
bool alternate_form = 0;
bool always_sign = false;
if (*p == '%' && *(p + 1)) {
one_more:
++p;
if (*p == '.') {
dot = true;
if (*(p + 1))
goto one_more;
}
if (*p == '-') {
left_pad = true;
if (*(p + 1))
goto one_more;
}
if (*p == '+') {
always_sign = true;
if (*(p + 1))
goto one_more;
}
if (!zero_pad && !field_width && *p == '0') {
zero_pad = true;
if (*(p + 1))
goto one_more;
}
if (*p >= '0' && *p <= '9') {
if (!dot) {
field_width *= 10;
field_width += *p - '0';
if (*(p + 1))
goto one_more;
} else {
fraction_length *= 10;
fraction_length += *p - '0';
if (*(p + 1))
goto one_more;
}
}
if (*p == '*') {
field_width = va_arg(ap, int);
if (*(p + 1))
goto one_more;
}
if (*p == 'l') {
++long_qualifiers;
if (*(p + 1))
goto one_more;
}
if (*p == 'z') {
size_qualifier = true;
if (*(p + 1))
goto one_more;
}
if (*p == '#') {
alternate_form = true;
if (*(p + 1))
goto one_more;
}
switch (*p) {
case 's': {
const char* sp = va_arg(ap, const char*);
if (!sp)
sp = "(null)";
ret += print_string(putch, bufptr, sp, strlen(sp), left_pad, field_width, dot);
} break;
case 'd':
case 'i':
if (long_qualifiers >= 2)
ret += print_i64(putch, bufptr, va_arg(ap, i64), left_pad, zero_pad, field_width);
else
ret += print_signed_number(putch, bufptr, va_arg(ap, int), left_pad, zero_pad, field_width, always_sign);
break;
case 'u':
if (long_qualifiers >= 2)
ret += print_u64(putch, bufptr, va_arg(ap, u64), left_pad, zero_pad, field_width);
else
ret += print_number(putch, bufptr, va_arg(ap, u32), left_pad, zero_pad, field_width);
break;
case 'Q':
ret += print_u64(putch, bufptr, va_arg(ap, u64), left_pad, zero_pad, field_width);
break;
case 'q':
ret += print_hex(putch, bufptr, va_arg(ap, u64), false, false, left_pad, zero_pad, 16);
break;
#if !defined(KERNEL)
case 'g':
case 'f':
ret += print_double(putch, bufptr, va_arg(ap, double), left_pad, zero_pad, field_width, fraction_length);
break;
#endif
case 'o':
if (alternate_form) {
putch(bufptr, '0');
++ret;
}
ret += print_octal_number(putch, bufptr, va_arg(ap, u32), left_pad, zero_pad, field_width);
break;
case 'X':
case 'x':
ret += print_hex(putch, bufptr, va_arg(ap, u32), *p == 'X', alternate_form, left_pad, zero_pad, field_width);
break;
case 'w':
ret += print_hex(putch, bufptr, va_arg(ap, int), false, alternate_form, false, true, 4);
break;
case 'b':
ret += print_hex(putch, bufptr, va_arg(ap, int), false, alternate_form, false, true, 2);
break;
case 'c': {
char c = va_arg(ap, int);
ret += print_string(putch, bufptr, &c, 1, left_pad, field_width, dot);
} break;
case '%':
putch(bufptr, '%');
++ret;
break;
case 'P':
case 'p':
ret += print_hex(putch, bufptr, va_arg(ap, u32), *p == 'P', true, false, true, 8);
break;
case 'n':
*va_arg(ap, int*) = ret;
break;
default:
dbg() << "printf_internal: Unimplemented format specifier " << *p << " (fmt: " << fmt << ")";
}
} else {
putch(bufptr, *p);
++ret;
}
}
return ret;
}
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