mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-08 21:21:48 +00:00
435 lines
20 KiB
C++
435 lines
20 KiB
C++
|
/*
|
||
|
|
* Copyright (c) 2018-2020 Atmosphère-NX
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify it
|
||
|
|
* under the terms and conditions of the GNU General Public License,
|
||
|
|
* version 2, as published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
||
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||
|
|
* more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
#include <vapours.hpp>
|
||
|
|
|
||
|
|
namespace ams::util {
|
||
|
|
|
||
|
|
#pragma GCC push_options
|
||
|
|
#pragma GCC optimize ("-Os")
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
|
||
|
|
/* Useful definitions for our VSNPrintf implementation. */
|
||
|
|
enum FormatSpecifierFlag : u32 {
|
||
|
|
FormatSpecifierFlag_None = 0,
|
||
|
|
FormatSpecifierFlag_EmptySign = (1 << 0),
|
||
|
|
FormatSpecifierFlag_ForceSign = (1 << 1),
|
||
|
|
FormatSpecifierFlag_Hash = (1 << 2),
|
||
|
|
FormatSpecifierFlag_LeftJustify = (1 << 3),
|
||
|
|
FormatSpecifierFlag_ZeroPad = (1 << 4),
|
||
|
|
FormatSpecifierFlag_Char = (1 << 5),
|
||
|
|
FormatSpecifierFlag_Short = (1 << 6),
|
||
|
|
FormatSpecifierFlag_Long = (1 << 7),
|
||
|
|
FormatSpecifierFlag_LongLong = (1 << 8),
|
||
|
|
FormatSpecifierFlag_Uppercase = (1 << 9),
|
||
|
|
FormatSpecifierFlag_HasPrecision = (1 << 10),
|
||
|
|
};
|
||
|
|
|
||
|
|
using FormatSpecifierFlagStorage = std::underlying_type<FormatSpecifierFlag>::type;
|
||
|
|
|
||
|
|
constexpr ALWAYS_INLINE bool IsDigit(char c) {
|
||
|
|
return '0' <= c && c <= '9';
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr ALWAYS_INLINE u32 ParseU32(const char *&str) {
|
||
|
|
u32 value = 0;
|
||
|
|
do {
|
||
|
|
value = (value * 10) + static_cast<u32>(*(str++) - '0');
|
||
|
|
} while (IsDigit(*str));
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr ALWAYS_INLINE size_t Strnlen(const char *str, size_t max) {
|
||
|
|
const char *cur = str;
|
||
|
|
while (*cur && max--) {
|
||
|
|
cur++;
|
||
|
|
}
|
||
|
|
return static_cast<size_t>(cur - str);
|
||
|
|
}
|
||
|
|
|
||
|
|
int TVSNPrintfImpl(char * const dst, const size_t dst_size, const char *format, ::std::va_list vl) {
|
||
|
|
size_t dst_index = 0;
|
||
|
|
|
||
|
|
auto WriteCharacter = [dst, dst_size, &dst_index](char c) ALWAYS_INLINE_LAMBDA {
|
||
|
|
if (const size_t i = (dst_index++); i < dst_size) {
|
||
|
|
dst[i] = c;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Loop over every character in the string, looking for format specifiers. */
|
||
|
|
while (*format) {
|
||
|
|
if (const char c = *(format++); c != '%') {
|
||
|
|
WriteCharacter(c);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* We have to parse a format specifier. */
|
||
|
|
/* Start by parsing flags. */
|
||
|
|
FormatSpecifierFlagStorage flags = FormatSpecifierFlag_None;
|
||
|
|
auto SetFlag = [&flags](FormatSpecifierFlag f) ALWAYS_INLINE_LAMBDA { flags |= f; };
|
||
|
|
auto ClearFlag = [&flags](FormatSpecifierFlag f) ALWAYS_INLINE_LAMBDA { flags &= ~f; };
|
||
|
|
auto HasFlag = [&flags](FormatSpecifierFlag f) ALWAYS_INLINE_LAMBDA { return (flags & f) != 0; };
|
||
|
|
{
|
||
|
|
bool parsed_flags = false;
|
||
|
|
while (!parsed_flags) {
|
||
|
|
switch (*format) {
|
||
|
|
case ' ': SetFlag(FormatSpecifierFlag_EmptySign); format++; break;
|
||
|
|
case '+': SetFlag(FormatSpecifierFlag_ForceSign); format++; break;
|
||
|
|
case '#': SetFlag(FormatSpecifierFlag_Hash); format++; break;
|
||
|
|
case '-': SetFlag(FormatSpecifierFlag_LeftJustify); format++; break;
|
||
|
|
case '0': SetFlag(FormatSpecifierFlag_ZeroPad); format++; break;
|
||
|
|
default:
|
||
|
|
parsed_flags = true;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Next, parse width. */
|
||
|
|
u32 width = 0;
|
||
|
|
if (IsDigit(*format)) {
|
||
|
|
/* Integer width. */
|
||
|
|
width = ParseU32(format);
|
||
|
|
} else if (*format == '*') {
|
||
|
|
/* Dynamic width. */
|
||
|
|
const int _width = va_arg(vl, int);
|
||
|
|
if (_width >= 0) {
|
||
|
|
width = static_cast<u32>(_width);
|
||
|
|
} else {
|
||
|
|
SetFlag(FormatSpecifierFlag_LeftJustify);
|
||
|
|
width = static_cast<u32>(-_width);
|
||
|
|
}
|
||
|
|
format++;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Next, parse precision if present. */
|
||
|
|
u32 precision = 0;
|
||
|
|
if (*format == '.') {
|
||
|
|
SetFlag(FormatSpecifierFlag_HasPrecision);
|
||
|
|
format++;
|
||
|
|
|
||
|
|
if (IsDigit(*format)) {
|
||
|
|
/* Integer precision. */
|
||
|
|
precision = ParseU32(format);
|
||
|
|
} else if (*format == '*') {
|
||
|
|
/* Dynamic precision. */
|
||
|
|
const int _precision = va_arg(vl, int);
|
||
|
|
if (_precision > 0) {
|
||
|
|
precision = static_cast<u32>(_precision);
|
||
|
|
}
|
||
|
|
format++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Parse length. */
|
||
|
|
constexpr bool SizeIsLong = sizeof(size_t) == sizeof(long);
|
||
|
|
constexpr bool IntMaxIsLong = sizeof(intmax_t) == sizeof(long);
|
||
|
|
constexpr bool PtrDiffIsLong = sizeof(ptrdiff_t) == sizeof(long);
|
||
|
|
switch (*format) {
|
||
|
|
case 'z':
|
||
|
|
SetFlag(SizeIsLong ? FormatSpecifierFlag_Long : FormatSpecifierFlag_LongLong);
|
||
|
|
format++;
|
||
|
|
break;
|
||
|
|
case 'j':
|
||
|
|
SetFlag(IntMaxIsLong ? FormatSpecifierFlag_Long : FormatSpecifierFlag_LongLong);
|
||
|
|
format++;
|
||
|
|
break;
|
||
|
|
case 't':
|
||
|
|
SetFlag(PtrDiffIsLong ? FormatSpecifierFlag_Long : FormatSpecifierFlag_LongLong);
|
||
|
|
format++;
|
||
|
|
break;
|
||
|
|
case 'h':
|
||
|
|
SetFlag(FormatSpecifierFlag_Short);
|
||
|
|
format++;
|
||
|
|
if (*format == 'h') {
|
||
|
|
SetFlag(FormatSpecifierFlag_Char);
|
||
|
|
format++;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 'l':
|
||
|
|
SetFlag(FormatSpecifierFlag_Long);
|
||
|
|
format++;
|
||
|
|
if (*format == 'l') {
|
||
|
|
SetFlag(FormatSpecifierFlag_LongLong);
|
||
|
|
format++;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
const char specifier = *(format++);
|
||
|
|
switch (specifier) {
|
||
|
|
case 'p':
|
||
|
|
if constexpr (sizeof(uintptr_t) == sizeof(long long)) {
|
||
|
|
SetFlag(FormatSpecifierFlag_LongLong);
|
||
|
|
} else {
|
||
|
|
SetFlag(FormatSpecifierFlag_Long);
|
||
|
|
}
|
||
|
|
SetFlag(FormatSpecifierFlag_Hash);
|
||
|
|
[[fallthrough]];
|
||
|
|
case 'd':
|
||
|
|
case 'i':
|
||
|
|
case 'u':
|
||
|
|
case 'b':
|
||
|
|
case 'o':
|
||
|
|
case 'x':
|
||
|
|
case 'X':
|
||
|
|
{
|
||
|
|
/* Determine the base to print with. */
|
||
|
|
u32 base;
|
||
|
|
switch (specifier) {
|
||
|
|
case 'b':
|
||
|
|
base = 2;
|
||
|
|
break;
|
||
|
|
case 'o':
|
||
|
|
base = 8;
|
||
|
|
break;
|
||
|
|
case 'X':
|
||
|
|
SetFlag(FormatSpecifierFlag_Uppercase);
|
||
|
|
[[fallthrough]];
|
||
|
|
case 'p':
|
||
|
|
case 'x':
|
||
|
|
base = 16;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
base = 10;
|
||
|
|
ClearFlag(FormatSpecifierFlag_Hash);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Precision implies no zero-padding. */
|
||
|
|
if (HasFlag(FormatSpecifierFlag_HasPrecision)) {
|
||
|
|
ClearFlag(FormatSpecifierFlag_ZeroPad);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Unsigned types don't get signs. */
|
||
|
|
const bool is_unsigned = base != 10 || specifier == 'u';
|
||
|
|
if (is_unsigned) {
|
||
|
|
ClearFlag(FormatSpecifierFlag_EmptySign);
|
||
|
|
ClearFlag(FormatSpecifierFlag_ForceSign);
|
||
|
|
}
|
||
|
|
|
||
|
|
auto PrintInteger = [&](bool negative, uintmax_t value) {
|
||
|
|
constexpr size_t BufferSize = 64; /* Binary digits for 64-bit numbers may use 64 digits. */
|
||
|
|
char buf[BufferSize];
|
||
|
|
size_t len = 0;
|
||
|
|
|
||
|
|
/* No hash flag for zero. */
|
||
|
|
if (value == 0) {
|
||
|
|
ClearFlag(FormatSpecifierFlag_Hash);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!HasFlag(FormatSpecifierFlag_HasPrecision) || value != 0) {
|
||
|
|
do {
|
||
|
|
const char digit = static_cast<char>(value % base);
|
||
|
|
buf[len++] = (digit < 10) ? ('0' + digit) : ((HasFlag(FormatSpecifierFlag_Uppercase) ? 'A' : 'a') + digit - 10);
|
||
|
|
value /= base;
|
||
|
|
} while (value);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Determine our prefix length. */
|
||
|
|
size_t prefix_len = 0;
|
||
|
|
const bool has_sign = negative || HasFlag(FormatSpecifierFlag_ForceSign) || HasFlag(FormatSpecifierFlag_EmptySign);
|
||
|
|
if (has_sign) {
|
||
|
|
prefix_len++;
|
||
|
|
}
|
||
|
|
if (HasFlag(FormatSpecifierFlag_Hash)) {
|
||
|
|
prefix_len += (base != 8) ? 2 : 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Determine zero-padding count. */
|
||
|
|
size_t num_zeroes = (len < precision) ? precision - len : 0;
|
||
|
|
if (!HasFlag(FormatSpecifierFlag_LeftJustify) && HasFlag(FormatSpecifierFlag_ZeroPad)) {
|
||
|
|
num_zeroes = (len + prefix_len < width) ? width - len - prefix_len : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Print out left padding. */
|
||
|
|
if (!HasFlag(FormatSpecifierFlag_LeftJustify)) {
|
||
|
|
for (size_t i = len + prefix_len + num_zeroes; i < static_cast<size_t>(width); i++) {
|
||
|
|
WriteCharacter(' ');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Print out sign. */
|
||
|
|
if (negative) {
|
||
|
|
WriteCharacter('-');
|
||
|
|
} else if (HasFlag(FormatSpecifierFlag_ForceSign)) {
|
||
|
|
WriteCharacter('+');
|
||
|
|
} else if (HasFlag(FormatSpecifierFlag_EmptySign)) {
|
||
|
|
WriteCharacter(' ');
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Print out base prefix. */
|
||
|
|
if (HasFlag(FormatSpecifierFlag_Hash)) {
|
||
|
|
WriteCharacter('0');
|
||
|
|
if (base == 2) {
|
||
|
|
WriteCharacter('b');
|
||
|
|
} else if (base == 16) {
|
||
|
|
WriteCharacter('x');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Print out zeroes. */
|
||
|
|
for (size_t i = 0; i < num_zeroes; i++) {
|
||
|
|
WriteCharacter('0');
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Print out digits. */
|
||
|
|
for (size_t i = 0; i < len; i++) {
|
||
|
|
WriteCharacter(buf[len - 1 - i]);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Print out right padding. */
|
||
|
|
if (HasFlag(FormatSpecifierFlag_LeftJustify)) {
|
||
|
|
for (size_t i = len + prefix_len + num_zeroes; i < static_cast<size_t>(width); i++) {
|
||
|
|
WriteCharacter(' ');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Output the integer. */
|
||
|
|
if (is_unsigned) {
|
||
|
|
uintmax_t n = 0;
|
||
|
|
if (HasFlag(FormatSpecifierFlag_LongLong)) {
|
||
|
|
n = static_cast<unsigned long long>(va_arg(vl, unsigned long long));
|
||
|
|
} else if (HasFlag(FormatSpecifierFlag_Long)) {
|
||
|
|
n = static_cast<unsigned long>(va_arg(vl, unsigned long));
|
||
|
|
} else if (HasFlag(FormatSpecifierFlag_Char)) {
|
||
|
|
n = static_cast<unsigned char>(va_arg(vl, unsigned int));
|
||
|
|
} else if (HasFlag(FormatSpecifierFlag_Short)) {
|
||
|
|
n = static_cast<unsigned short>(va_arg(vl, unsigned int));
|
||
|
|
} else {
|
||
|
|
n = static_cast<unsigned int>(va_arg(vl, unsigned int));
|
||
|
|
}
|
||
|
|
if (specifier == 'p' && n == 0) {
|
||
|
|
WriteCharacter('(');
|
||
|
|
WriteCharacter('n');
|
||
|
|
WriteCharacter('i');
|
||
|
|
WriteCharacter('l');
|
||
|
|
WriteCharacter(')');
|
||
|
|
} else {
|
||
|
|
PrintInteger(false, n);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
intmax_t n = 0;
|
||
|
|
if (HasFlag(FormatSpecifierFlag_LongLong)) {
|
||
|
|
n = static_cast<signed long long>(va_arg(vl, signed long long));
|
||
|
|
} else if (HasFlag(FormatSpecifierFlag_Long)) {
|
||
|
|
n = static_cast<signed long>(va_arg(vl, signed long));
|
||
|
|
} else if (HasFlag(FormatSpecifierFlag_Char)) {
|
||
|
|
n = static_cast<signed char>(va_arg(vl, signed int));
|
||
|
|
} else if (HasFlag(FormatSpecifierFlag_Short)) {
|
||
|
|
n = static_cast<signed short>(va_arg(vl, signed int));
|
||
|
|
} else {
|
||
|
|
n = static_cast<signed int>(va_arg(vl, signed int));
|
||
|
|
}
|
||
|
|
const bool negative = n < 0;
|
||
|
|
const uintmax_t u = (negative) ? static_cast<uintmax_t>(-n) : static_cast<uintmax_t>(n);
|
||
|
|
PrintInteger(negative, u);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 'c':
|
||
|
|
{
|
||
|
|
size_t len = 1;
|
||
|
|
if (!HasFlag(FormatSpecifierFlag_LeftJustify)) {
|
||
|
|
while (len++ < width) {
|
||
|
|
WriteCharacter(' ');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
WriteCharacter(static_cast<char>(va_arg(vl, int)));
|
||
|
|
if (HasFlag(FormatSpecifierFlag_LeftJustify)) {
|
||
|
|
while (len++ < width) {
|
||
|
|
WriteCharacter(' ');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 's':
|
||
|
|
{
|
||
|
|
const char *str = va_arg(vl, char *);
|
||
|
|
if (str == nullptr) {
|
||
|
|
str = "(null)";
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t len = Strnlen(str, precision > 0 ? precision : std::numeric_limits<size_t>::max());
|
||
|
|
if (HasFlag(FormatSpecifierFlag_HasPrecision)) {
|
||
|
|
len = (len < precision) ? len : precision;
|
||
|
|
}
|
||
|
|
if (!HasFlag(FormatSpecifierFlag_LeftJustify)) {
|
||
|
|
while (len++ < width) {
|
||
|
|
WriteCharacter(' ');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
while (*str && (!HasFlag(FormatSpecifierFlag_HasPrecision) || (precision--) != 0)) {
|
||
|
|
WriteCharacter(*(str++));
|
||
|
|
}
|
||
|
|
if (HasFlag(FormatSpecifierFlag_LeftJustify)) {
|
||
|
|
while (len++ < width) {
|
||
|
|
WriteCharacter(' ');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case '%':
|
||
|
|
default:
|
||
|
|
WriteCharacter(specifier);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Ensure null termination. */
|
||
|
|
WriteCharacter('\0');
|
||
|
|
dst[dst_size - 1] = '\0';
|
||
|
|
|
||
|
|
/* Return number of characters that would have been printed sans the null terminator. */
|
||
|
|
return static_cast<int>(dst_index) - 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
#pragma GCC pop_options
|
||
|
|
|
||
|
|
int TVSNPrintf(char *dst, size_t dst_size, const char *fmt, std::va_list vl) {
|
||
|
|
return TVSNPrintfImpl(dst, dst_size, fmt, vl);
|
||
|
|
}
|
||
|
|
|
||
|
|
int TSNPrintf(char *dst, size_t dst_size, const char *fmt, ...) {
|
||
|
|
std::va_list vl;
|
||
|
|
va_start(vl, fmt);
|
||
|
|
const int len = TVSNPrintf(dst, dst_size, fmt, vl);
|
||
|
|
va_end(vl);
|
||
|
|
|
||
|
|
return len;
|
||
|
|
}
|
||
|
|
|
||
|
|
int VSNPrintf(char *dst, size_t dst_size, const char *fmt, std::va_list vl) {
|
||
|
|
/* TODO: floating point support? */
|
||
|
|
return TVSNPrintfImpl(dst, dst_size, fmt, vl);
|
||
|
|
}
|
||
|
|
|
||
|
|
int SNPrintf(char *dst, size_t dst_size, const char *fmt, ...) {
|
||
|
|
std::va_list vl;
|
||
|
|
va_start(vl, fmt);
|
||
|
|
const int len = VSNPrintf(dst, dst_size, fmt, vl);
|
||
|
|
va_end(vl);
|
||
|
|
|
||
|
|
return len;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|