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