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ladybird/AK/PrintfImplementation.h
Sergey Bugaev 5bb18bf548 AK: Use print_string() for %c formatting 
Instead of simply outputting the character. This way, we get proper padding
support and other niceties strings enjoy.
2020-03-26 08:01:16 +01:00

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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>
[[gnu::always_inline]] inline int print_hex(PutChFunc putch, char*& bufptr, T number, bool upper_case, bool alternate_form, bool left_pad, bool zeroPad, u8 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 = 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;
width += 2;
}
if (zeroPad) {
while (ret < 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>
[[gnu::always_inline]] inline int print_number(PutChFunc putch, char*& bufptr, u32 number, bool leftPad, bool zeroPad, u32 fieldWidth)
{
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 (!fieldWidth || fieldWidth < numlen)
fieldWidth = numlen;
if (!leftPad) {
for (unsigned i = 0; i < fieldWidth - numlen; ++i) {
putch(bufptr, zeroPad ? '0' : ' ');
}
}
for (unsigned i = 0; i < numlen; ++i) {
putch(bufptr, buf[i]);
}
if (leftPad) {
for (unsigned i = 0; i < fieldWidth - numlen; ++i) {
putch(bufptr, ' ');
}
}
return fieldWidth;
}
template<typename PutChFunc>
[[gnu::always_inline]] inline int print_u64(PutChFunc putch, char*& bufptr, u64 number, bool leftPad, bool zeroPad, u32 fieldWidth)
{
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 (!fieldWidth || fieldWidth < numlen)
fieldWidth = numlen;
if (!leftPad) {
for (unsigned i = 0; i < fieldWidth - numlen; ++i) {
putch(bufptr, zeroPad ? '0' : ' ');
}
}
for (unsigned i = 0; i < numlen; ++i) {
putch(bufptr, buf[i]);
}
if (leftPad) {
for (unsigned i = 0; i < fieldWidth - numlen; ++i) {
putch(bufptr, ' ');
}
}
return fieldWidth;
}
template<typename PutChFunc>
[[gnu::always_inline]] inline int print_i64(PutChFunc putch, char*& bufptr, i64 number, bool leftPad, bool zeroPad, u32 fieldWidth)
{
if (number < 0) {
putch(bufptr, '-');
return print_u64(putch, bufptr, 0 - number, leftPad, zeroPad, fieldWidth) + 1;
}
return print_u64(putch, bufptr, number, leftPad, zeroPad, fieldWidth);
}
template<typename PutChFunc>
[[gnu::always_inline]] inline int print_octal_number(PutChFunc putch, char*& bufptr, u32 number, bool leftPad, bool zeroPad, u32 fieldWidth)
{
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 (!fieldWidth || fieldWidth < numlen)
fieldWidth = numlen;
if (!leftPad) {
for (unsigned i = 0; i < fieldWidth - numlen; ++i) {
putch(bufptr, zeroPad ? '0' : ' ');
}
}
for (unsigned i = 0; i < numlen; ++i) {
putch(bufptr, buf[i]);
}
if (leftPad) {
for (unsigned i = 0; i < fieldWidth - numlen; ++i) {
putch(bufptr, ' ');
}
}
return fieldWidth;
}
template<typename PutChFunc>
[[gnu::always_inline]] inline int print_string(PutChFunc putch, char*& bufptr, const char* str, bool left_pad, size_t field_width, bool dot)
{
size_t len = strlen(str);
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>
[[gnu::always_inline]] inline int print_signed_number(PutChFunc putch, char*& bufptr, int number, bool leftPad, bool zeroPad, u32 fieldWidth, bool always_sign)
{
if (number < 0) {
putch(bufptr, '-');
return print_number(putch, bufptr, 0 - number, leftPad, zeroPad, fieldWidth) + 1;
}
if (always_sign)
putch(bufptr, '+');
return print_number(putch, bufptr, number, leftPad, zeroPad, fieldWidth);
}
template<typename PutChFunc>
[[gnu::always_inline]] 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 zeroPad = false;
bool dot = false;
unsigned fieldWidth = 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 (!zeroPad && !fieldWidth && *p == '0') {
zeroPad = true;
if (*(p + 1))
goto one_more;
}
if (*p >= '0' && *p <= '9') {
fieldWidth *= 10;
fieldWidth += *p - '0';
if (*(p + 1))
goto one_more;
}
if (*p == '*') {
fieldWidth = 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*);
ret += print_string(putch, bufptr, sp ? sp : "(null)", left_pad, fieldWidth, dot);
} break;
case 'd':
case 'i':
if (long_qualifiers >= 2)
ret += print_i64(putch, bufptr, va_arg(ap, i64), left_pad, zeroPad, fieldWidth);
else
ret += print_signed_number(putch, bufptr, va_arg(ap, int), left_pad, zeroPad, fieldWidth, always_sign);
break;
case 'u':
if (long_qualifiers >= 2)
ret += print_u64(putch, bufptr, va_arg(ap, u64), left_pad, zeroPad, fieldWidth);
else
ret += print_number(putch, bufptr, va_arg(ap, u32), left_pad, zeroPad, fieldWidth);
break;
case 'Q':
ret += print_u64(putch, bufptr, va_arg(ap, u64), left_pad, zeroPad, fieldWidth);
break;
case 'q':
ret += print_hex(putch, bufptr, va_arg(ap, u64), false, false, left_pad, zeroPad, 16);
break;
#if !defined(BOOTSTRAPPER) && !defined(KERNEL)
case 'g':
case 'f':
// FIXME: Print as float!
ret += print_i64(putch, bufptr, (u64)va_arg(ap, double), left_pad, zeroPad, fieldWidth);
break;
#endif
case 'o':
if (alternate_form) {
putch(bufptr, '0');
++ret;
}
ret += print_octal_number(putch, bufptr, va_arg(ap, u32), left_pad, zeroPad, fieldWidth);
break;
case 'X':
case 'x':
ret += print_hex(putch, bufptr, va_arg(ap, u32), *p == 'X', alternate_form, left_pad, zeroPad, fieldWidth);
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 s[2] { (char)va_arg(ap, int), 0 };
ret += print_string(putch, bufptr, s, left_pad, fieldWidth, 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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