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Add STL's general formatting for ryu_printf #185

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Add STL's general formatting for ryu_printf #185

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94 changes: 94 additions & 0 deletions ryu/d2fixed.c
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Original file line number Diff line number Diff line change
Expand Up @@ -817,3 +817,97 @@ char* d2exp(double d, uint32_t precision) {
buffer[index] = '\0';
return buffer;
}

typedef union _f64i {
uint64_t i;
double f;
} f64i;

inline static uint32_t i32_to_u32(int32_t a) {
return a < 0 ? 0 : a;
}

inline static uint32_t minu32(uint32_t a, uint32_t b) {
return a < b ? a : b;
}

// https://reviews.llvm.org/D70631
// _Floating_to_chars_general_precision
int d2gen_buffered_n(double d, uint32_t precision, char* result) {
f64i onion = {.f = d};
int index = 0;
if (onion.i == 0) {
result[index++] = '0';
return index;
}

// Omitting the _Precision stuff. Are we sure the allocating APIs won't blow up though?
const uint64_t *table_begin;
ptrdiff_t table_length;
if (precision < MAX_SPECIAL_P) {
table_begin = SPECIAL_X + (precision - 1) * (precision + 10) / 2;
table_length = precision + 5;
} else {
table_begin = ORDINARY_X;
table_length = minu32(precision, MAX_ORDINARY_P) + 5;
}

ptrdiff_t index;
for (index = 0; index < table_length; index++) {
if (onion.i <= table_begin[index]) {
break;
}
}

const int sci_exp_x = index - 5;
const bool use_fixed_notation = precision > sci_exp_x && sci_exp_x >= -4;
const int max_fixed_precision = 66;
const int max_sci_precision = 766;
int effective_precision;

char* significand_last = NULL;
char* exponent_first = NULL;
char* exponent_last = NULL;

// Write into the local buffer.
if (use_fixed_notation) {
effective_precision = minu32(i32_to_u32(precision - (sci_exp_x + 1)), max_fixed_precision);
int len = d2fixed_buffered_n(d, effective_precision, result);
significand_last = result + len;
} else {
effective_precision = minu32(i32_to_u32(precision - 1), max_sci_precision);
int len = d2exp_buffered_n(d, effective_precision, result);
exponent_first = memchr(result, 'e', len);
significand_last = exponent_first - 1;
exponent_last = result + len;
}

// If we printed a decimal point followed by digits, perform zero-trimming.
if (effective_precision > 0) {
while (significand_last[-1] == '0') {
--significand_last;
}

if (significand_last[-1] == '.') {
--significand_last;
}
}

// My head hurts asdfghklgu
if (!use_fixed_notation) {
memmove(significand_last, exponent_first, exponent_last - exponent_first);
}
return significand_last - result + exponent_last - exponent_first;
}

void d2gen_buffered(double d, uint32_t precision, char* result) {
const int len = d2gen_buffered_n(d, precision, result);
result[len] = '\0';
}

char* d2gen(double d, uint32_t precision) {
char* const buffer = (char*)malloc(2000);
const int index = d2gen_buffered_n(d, precision, buffer);
buffer[index] = '\0';
return buffer;
}
179 changes: 179 additions & 0 deletions ryu/d2fixed_full_table.h
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Original file line number Diff line number Diff line change
Expand Up @@ -4417,4 +4417,183 @@ static const uint64_t POW10_SPLIT_2[3133][3] = {
{ 0u, 0u, 33000000000u },
};

// This is not yet calculated.
// See https://reviews.llvm.org/file/data/kb2knv5sxt2jhdfj25ah/PHID-FILE-6wgegsparpeqk3ror2gv/libcxx_include_charconv
// for what it is and what generates it.
#define MAX_SPECIAL_P 15
static uint64_t SPECIAL_X[195] = {
0x3F18E757928E0C9Du, 0x3F4F212D77318FC5u, 0x3F8374BC6A7EF9DBu,
0x3FB851EB851EB851u, 0x3FEE666666666666u, 0x4022FFFFFFFFFFFFu,
0x3F1A1554FBDAD751u, 0x3F504D551D68C692u, 0x3F8460AA64C2F837u,
0x3FB978D4FDF3B645u, 0x3FEFD70A3D70A3D7u, 0x4023E66666666666u,
0x4058DFFFFFFFFFFFu, 0x3F1A3387ECC8EB96u, 0x3F506034F3FD933Eu,
0x3F84784230FCF80Du, 0x3FB99652BD3C3611u, 0x3FEFFBE76C8B4395u,
0x4023FD70A3D70A3Du, 0x4058FCCCCCCCCCCCu, 0x408F3BFFFFFFFFFFu,
0x3F1A368D04E0BA6Au, 0x3F506218230C7482u, 0x3F847A9E2BCF91A3u,
0x3FB99945B6C3760Bu, 0x3FEFFF972474538Eu, 0x4023FFBE76C8B439u,
0x4058FFAE147AE147u, 0x408F3F9999999999u, 0x40C387BFFFFFFFFFu,
0x3F1A36DA54164F19u, 0x3F506248748DF16Fu, 0x3F847ADA91B16DCBu,
0x3FB99991361DC93Eu, 0x3FEFFFF583A53B8Eu, 0x4023FFF972474538u,
0x4058FFF7CED91687u, 0x408F3FF5C28F5C28u, 0x40C387F999999999u,
0x40F869F7FFFFFFFFu, 0x3F1A36E20F35445Du, 0x3F50624D49814ABAu,
0x3F847AE09BE19D69u, 0x3FB99998C2DA04C3u, 0x3FEFFFFEF39085F4u,
0x4023FFFF583A53B8u, 0x4058FFFF2E48E8A7u, 0x408F3FFEF9DB22D0u,
0x40C387FF5C28F5C2u, 0x40F869FF33333333u, 0x412E847EFFFFFFFFu,
0x3F1A36E2D51EC34Bu, 0x3F50624DC5333A0Eu, 0x3F847AE136800892u,
0x3FB9999984200AB7u, 0x3FEFFFFFE5280D65u, 0x4023FFFFEF39085Fu,
0x4058FFFFEB074A77u, 0x408F3FFFE5C91D14u, 0x40C387FFEF9DB22Du,
0x40F869FFEB851EB8u, 0x412E847FE6666666u, 0x416312CFEFFFFFFFu,
0x3F1A36E2E8E94FFCu, 0x3F50624DD191D1FDu, 0x3F847AE145F6467Du,
0x3FB999999773D81Cu, 0x3FEFFFFFFD50CE23u, 0x4023FFFFFE5280D6u,
0x4058FFFFFDE7210Bu, 0x408F3FFFFD60E94Eu, 0x40C387FFFE5C91D1u,
0x40F869FFFDF3B645u, 0x412E847FFD70A3D7u, 0x416312CFFE666666u,
0x4197D783FDFFFFFFu, 0x3F1A36E2EAE3F7A7u, 0x3F50624DD2CE7AC8u,
0x3F847AE14782197Bu, 0x3FB9999999629FD9u, 0x3FEFFFFFFFBB47D0u,
0x4023FFFFFFD50CE2u, 0x4058FFFFFFCA501Au, 0x408F3FFFFFBCE421u,
0x40C387FFFFD60E94u, 0x40F869FFFFCB923Au, 0x412E847FFFBE76C8u,
0x416312CFFFD70A3Du, 0x4197D783FFCCCCCCu, 0x41CDCD64FFBFFFFFu,
0x3F1A36E2EB16A205u, 0x3F50624DD2EE2543u, 0x3F847AE147A9AE94u,
0x3FB9999999941A39u, 0x3FEFFFFFFFF920C8u, 0x4023FFFFFFFBB47Du,
0x4058FFFFFFFAA19Cu, 0x408F3FFFFFF94A03u, 0x40C387FFFFFBCE42u,
0x40F869FFFFFAC1D2u, 0x412E847FFFF97247u, 0x416312CFFFFBE76Cu,
0x4197D783FFFAE147u, 0x41CDCD64FFF99999u, 0x4202A05F1FFBFFFFu,
0x3F1A36E2EB1BB30Fu, 0x3F50624DD2F14FE9u, 0x3F847AE147ADA3E3u,
0x3FB9999999990CDCu, 0x3FEFFFFFFFFF5014u, 0x4023FFFFFFFF920Cu,
0x4058FFFFFFFF768Fu, 0x408F3FFFFFFF5433u, 0x40C387FFFFFF94A0u,
0x40F869FFFFFF79C8u, 0x412E847FFFFF583Au, 0x416312CFFFFF9724u,
0x4197D783FFFF7CEDu, 0x41CDCD64FFFF5C28u, 0x4202A05F1FFF9999u,
0x42374876E7FF7FFFu, 0x3F1A36E2EB1C34C3u, 0x3F50624DD2F1A0FAu,
0x3F847AE147AE0938u, 0x3FB9999999998B86u, 0x3FEFFFFFFFFFEE68u,
0x4023FFFFFFFFF501u, 0x4058FFFFFFFFF241u, 0x408F3FFFFFFFEED1u,
0x40C387FFFFFFF543u, 0x40F869FFFFFFF294u, 0x412E847FFFFFEF39u,
0x416312CFFFFFF583u, 0x4197D783FFFFF2E4u, 0x41CDCD64FFFFEF9Du,
0x4202A05F1FFFF5C2u, 0x42374876E7FFF333u, 0x426D1A94A1FFEFFFu,
0x3F1A36E2EB1C41BBu, 0x3F50624DD2F1A915u, 0x3F847AE147AE135Au,
0x3FB9999999999831u, 0x3FEFFFFFFFFFFE3Du, 0x4023FFFFFFFFFEE6u,
0x4058FFFFFFFFFEA0u, 0x408F3FFFFFFFFE48u, 0x40C387FFFFFFFEEDu,
0x40F869FFFFFFFEA8u, 0x412E847FFFFFFE52u, 0x416312CFFFFFFEF3u,
0x4197D783FFFFFEB0u, 0x41CDCD64FFFFFE5Cu, 0x4202A05F1FFFFEF9u,
0x42374876E7FFFEB8u, 0x426D1A94A1FFFE66u, 0x42A2309CE53FFEFFu,
0x3F1A36E2EB1C4307u, 0x3F50624DD2F1A9E4u, 0x3F847AE147AE145Eu,
0x3FB9999999999975u, 0x3FEFFFFFFFFFFFD2u, 0x4023FFFFFFFFFFE3u,
0x4058FFFFFFFFFFDCu, 0x408F3FFFFFFFFFD4u, 0x40C387FFFFFFFFE4u,
0x40F869FFFFFFFFDDu, 0x412E847FFFFFFFD5u, 0x416312CFFFFFFFE5u,
0x4197D783FFFFFFDEu, 0x41CDCD64FFFFFFD6u, 0x4202A05F1FFFFFE5u,
0x42374876E7FFFFDFu, 0x426D1A94A1FFFFD7u, 0x42A2309CE53FFFE6u,
0x42D6BCC41E8FFFDFu, 0x3F1A36E2EB1C4328u, 0x3F50624DD2F1A9F9u,
0x3F847AE147AE1477u, 0x3FB9999999999995u, 0x3FEFFFFFFFFFFFFBu,
0x4023FFFFFFFFFFFDu, 0x4058FFFFFFFFFFFCu, 0x408F3FFFFFFFFFFBu,
0x40C387FFFFFFFFFDu, 0x40F869FFFFFFFFFCu, 0x412E847FFFFFFFFBu,
0x416312CFFFFFFFFDu, 0x4197D783FFFFFFFCu, 0x41CDCD64FFFFFFFBu,
0x4202A05F1FFFFFFDu, 0x42374876E7FFFFFCu, 0x426D1A94A1FFFFFBu,
0x42A2309CE53FFFFDu, 0x42D6BCC41E8FFFFCu, 0x430C6BF52633FFFBu};

#define MAX_ORDINARY_P 309
static uint64_t ORDINARY_X[314] = {
0x3F1A36E2EB1C432Cu, 0x3F50624DD2F1A9FBu, 0x3F847AE147AE147Au,
0x3FB9999999999999u, 0x3FEFFFFFFFFFFFFFu, 0x4023FFFFFFFFFFFFu,
0x4058FFFFFFFFFFFFu, 0x408F3FFFFFFFFFFFu, 0x40C387FFFFFFFFFFu,
0x40F869FFFFFFFFFFu, 0x412E847FFFFFFFFFu, 0x416312CFFFFFFFFFu,
0x4197D783FFFFFFFFu, 0x41CDCD64FFFFFFFFu, 0x4202A05F1FFFFFFFu,
0x42374876E7FFFFFFu, 0x426D1A94A1FFFFFFu, 0x42A2309CE53FFFFFu,
0x42D6BCC41E8FFFFFu, 0x430C6BF52633FFFFu, 0x4341C37937E07FFFu,
0x4376345785D89FFFu, 0x43ABC16D674EC7FFu, 0x43E158E460913CFFu,
0x4415AF1D78B58C3Fu, 0x444B1AE4D6E2EF4Fu, 0x4480F0CF064DD591u,
0x44B52D02C7E14AF6u, 0x44EA784379D99DB4u, 0x45208B2A2C280290u,
0x4554ADF4B7320334u, 0x4589D971E4FE8401u, 0x45C027E72F1F1281u,
0x45F431E0FAE6D721u, 0x46293E5939A08CE9u, 0x465F8DEF8808B024u,
0x4693B8B5B5056E16u, 0x46C8A6E32246C99Cu, 0x46FED09BEAD87C03u,
0x4733426172C74D82u, 0x476812F9CF7920E2u, 0x479E17B84357691Bu,
0x47D2CED32A16A1B1u, 0x48078287F49C4A1Du, 0x483D6329F1C35CA4u,
0x48725DFA371A19E6u, 0x48A6F578C4E0A060u, 0x48DCB2D6F618C878u,
0x4911EFC659CF7D4Bu, 0x49466BB7F0435C9Eu, 0x497C06A5EC5433C6u,
0x49B18427B3B4A05Bu, 0x49E5E531A0A1C872u, 0x4A1B5E7E08CA3A8Fu,
0x4A511B0EC57E6499u, 0x4A8561D276DDFDC0u, 0x4ABABA4714957D30u,
0x4AF0B46C6CDD6E3Eu, 0x4B24E1878814C9CDu, 0x4B5A19E96A19FC40u,
0x4B905031E2503DA8u, 0x4BC4643E5AE44D12u, 0x4BF97D4DF19D6057u,
0x4C2FDCA16E04B86Du, 0x4C63E9E4E4C2F344u, 0x4C98E45E1DF3B015u,
0x4CCF1D75A5709C1Au, 0x4D03726987666190u, 0x4D384F03E93FF9F4u,
0x4D6E62C4E38FF872u, 0x4DA2FDBB0E39FB47u, 0x4DD7BD29D1C87A19u,
0x4E0DAC74463A989Fu, 0x4E428BC8ABE49F63u, 0x4E772EBAD6DDC73Cu,
0x4EACFA698C95390Bu, 0x4EE21C81F7DD43A7u, 0x4F16A3A275D49491u,
0x4F4C4C8B1349B9B5u, 0x4F81AFD6EC0E1411u, 0x4FB61BCCA7119915u,
0x4FEBA2BFD0D5FF5Bu, 0x502145B7E285BF98u, 0x50559725DB272F7Fu,
0x508AFCEF51F0FB5Eu, 0x50C0DE1593369D1Bu, 0x50F5159AF8044462u,
0x512A5B01B605557Au, 0x516078E111C3556Cu, 0x5194971956342AC7u,
0x51C9BCDFABC13579u, 0x5200160BCB58C16Cu, 0x52341B8EBE2EF1C7u,
0x526922726DBAAE39u, 0x529F6B0F092959C7u, 0x52D3A2E965B9D81Cu,
0x53088BA3BF284E23u, 0x533EAE8CAEF261ACu, 0x53732D17ED577D0Bu,
0x53A7F85DE8AD5C4Eu, 0x53DDF67562D8B362u, 0x5412BA095DC7701Du,
0x5447688BB5394C25u, 0x547D42AEA2879F2Eu, 0x54B249AD2594C37Cu,
0x54E6DC186EF9F45Cu, 0x551C931E8AB87173u, 0x5551DBF316B346E7u,
0x558652EFDC6018A1u, 0x55BBE7ABD3781ECAu, 0x55F170CB642B133Eu,
0x5625CCFE3D35D80Eu, 0x565B403DCC834E11u, 0x569108269FD210CBu,
0x56C54A3047C694FDu, 0x56FA9CBC59B83A3Du, 0x5730A1F5B8132466u,
0x5764CA732617ED7Fu, 0x5799FD0FEF9DE8DFu, 0x57D03E29F5C2B18Bu,
0x58044DB473335DEEu, 0x583961219000356Au, 0x586FB969F40042C5u,
0x58A3D3E2388029BBu, 0x58D8C8DAC6A0342Au, 0x590EFB1178484134u,
0x59435CEAEB2D28C0u, 0x59783425A5F872F1u, 0x59AE412F0F768FADu,
0x59E2E8BD69AA19CCu, 0x5A17A2ECC414A03Fu, 0x5A4D8BA7F519C84Fu,
0x5A827748F9301D31u, 0x5AB7151B377C247Eu, 0x5AECDA62055B2D9Du,
0x5B22087D4358FC82u, 0x5B568A9C942F3BA3u, 0x5B8C2D43B93B0A8Bu,
0x5BC19C4A53C4E697u, 0x5BF6035CE8B6203Du, 0x5C2B843422E3A84Cu,
0x5C6132A095CE492Fu, 0x5C957F48BB41DB7Bu, 0x5CCADF1AEA12525Au,
0x5D00CB70D24B7378u, 0x5D34FE4D06DE5056u, 0x5D6A3DE04895E46Cu,
0x5DA066AC2D5DAEC3u, 0x5DD4805738B51A74u, 0x5E09A06D06E26112u,
0x5E400444244D7CABu, 0x5E7405552D60DBD6u, 0x5EA906AA78B912CBu,
0x5EDF485516E7577Eu, 0x5F138D352E5096AFu, 0x5F48708279E4BC5Au,
0x5F7E8CA3185DEB71u, 0x5FB317E5EF3AB327u, 0x5FE7DDDF6B095FF0u,
0x601DD55745CBB7ECu, 0x6052A5568B9F52F4u, 0x60874EAC2E8727B1u,
0x60BD22573A28F19Du, 0x60F2357684599702u, 0x6126C2D4256FFCC2u,
0x615C73892ECBFBF3u, 0x6191C835BD3F7D78u, 0x61C63A432C8F5CD6u,
0x61FBC8D3F7B3340Bu, 0x62315D847AD00087u, 0x6265B4E5998400A9u,
0x629B221EFFE500D3u, 0x62D0F5535FEF2084u, 0x630532A837EAE8A5u,
0x633A7F5245E5A2CEu, 0x63708F936BAF85C1u, 0x63A4B378469B6731u,
0x63D9E056584240FDu, 0x64102C35F729689Eu, 0x6444374374F3C2C6u,
0x647945145230B377u, 0x64AF965966BCE055u, 0x64E3BDF7E0360C35u,
0x6518AD75D8438F43u, 0x654ED8D34E547313u, 0x6583478410F4C7ECu,
0x65B819651531F9E7u, 0x65EE1FBE5A7E7861u, 0x6622D3D6F88F0B3Cu,
0x665788CCB6B2CE0Cu, 0x668D6AFFE45F818Fu, 0x66C262DFEEBBB0F9u,
0x66F6FB97EA6A9D37u, 0x672CBA7DE5054485u, 0x6761F48EAF234AD3u,
0x679671B25AEC1D88u, 0x67CC0E1EF1A724EAu, 0x680188D357087712u,
0x6835EB082CCA94D7u, 0x686B65CA37FD3A0Du, 0x68A11F9E62FE4448u,
0x68D56785FBBDD55Au, 0x690AC1677AAD4AB0u, 0x6940B8E0ACAC4EAEu,
0x6974E718D7D7625Au, 0x69AA20DF0DCD3AF0u, 0x69E0548B68A044D6u,
0x6A1469AE42C8560Cu, 0x6A498419D37A6B8Fu, 0x6A7FE52048590672u,
0x6AB3EF342D37A407u, 0x6AE8EB0138858D09u, 0x6B1F25C186A6F04Cu,
0x6B537798F428562Fu, 0x6B88557F31326BBBu, 0x6BBE6ADEFD7F06AAu,
0x6BF302CB5E6F642Au, 0x6C27C37E360B3D35u, 0x6C5DB45DC38E0C82u,
0x6C9290BA9A38C7D1u, 0x6CC734E940C6F9C5u, 0x6CFD022390F8B837u,
0x6D3221563A9B7322u, 0x6D66A9ABC9424FEBu, 0x6D9C5416BB92E3E6u,
0x6DD1B48E353BCE6Fu, 0x6E0621B1C28AC20Bu, 0x6E3BAA1E332D728Eu,
0x6E714A52DFFC6799u, 0x6EA59CE797FB817Fu, 0x6EDB04217DFA61DFu,
0x6F10E294EEBC7D2Bu, 0x6F451B3A2A6B9C76u, 0x6F7A6208B5068394u,
0x6FB07D457124123Cu, 0x6FE49C96CD6D16CBu, 0x7019C3BC80C85C7Eu,
0x70501A55D07D39CFu, 0x708420EB449C8842u, 0x70B9292615C3AA53u,
0x70EF736F9B3494E8u, 0x7123A825C100DD11u, 0x7158922F31411455u,
0x718EB6BAFD91596Bu, 0x71C33234DE7AD7E2u, 0x71F7FEC216198DDBu,
0x722DFE729B9FF152u, 0x7262BF07A143F6D3u, 0x72976EC98994F488u,
0x72CD4A7BEBFA31AAu, 0x73024E8D737C5F0Au, 0x7336E230D05B76CDu,
0x736C9ABD04725480u, 0x73A1E0B622C774D0u, 0x73D658E3AB795204u,
0x740BEF1C9657A685u, 0x74417571DDF6C813u, 0x7475D2CE55747A18u,
0x74AB4781EAD1989Eu, 0x74E10CB132C2FF63u, 0x75154FDD7F73BF3Bu,
0x754AA3D4DF50AF0Au, 0x7580A6650B926D66u, 0x75B4CFFE4E7708C0u,
0x75EA03FDE214CAF0u, 0x7620427EAD4CFED6u, 0x7654531E58A03E8Bu,
0x768967E5EEC84E2Eu, 0x76BFC1DF6A7A61BAu, 0x76F3D92BA28C7D14u,
0x7728CF768B2F9C59u, 0x775F03542DFB8370u, 0x779362149CBD3226u,
0x77C83A99C3EC7EAFu, 0x77FE494034E79E5Bu, 0x7832EDC82110C2F9u,
0x7867A93A2954F3B7u, 0x789D9388B3AA30A5u, 0x78D27C35704A5E67u,
0x79071B42CC5CF601u, 0x793CE2137F743381u, 0x79720D4C2FA8A030u,
0x79A6909F3B92C83Du, 0x79DC34C70A777A4Cu, 0x7A11A0FC668AAC6Fu,
0x7A46093B802D578Bu, 0x7A7B8B8A6038AD6Eu, 0x7AB137367C236C65u,
0x7AE585041B2C477Eu, 0x7B1AE64521F7595Eu, 0x7B50CFEB353A97DAu,
0x7B8503E602893DD1u, 0x7BBA44DF832B8D45u, 0x7BF06B0BB1FB384Bu,
0x7C2485CE9E7A065Eu, 0x7C59A742461887F6u, 0x7C9008896BCF54F9u,
0x7CC40AABC6C32A38u, 0x7CF90D56B873F4C6u, 0x7D2F50AC6690F1F8u,
0x7D63926BC01A973Bu, 0x7D987706B0213D09u, 0x7DCE94C85C298C4Cu,
0x7E031CFD3999F7AFu, 0x7E37E43C8800759Bu, 0x7E6DDD4BAA009302u,
0x7EA2AA4F4A405BE1u, 0x7ED754E31CD072D9u, 0x7F0D2A1BE4048F90u,
0x7F423A516E82D9BAu, 0x7F76C8E5CA239028u, 0x7FAC7B1F3CAC7433u,
0x7FE1CCF385EBC89Fu, 0x7FEFFFFFFFFFFFFFu};

#endif // RYU_D2FIXED_FULL_TABLE_H
5 changes: 5 additions & 0 deletions ryu/ryu.h
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@ int f2s_buffered_n(float f, char* result);
void f2s_buffered(float f, char* result);
char* f2s(float f);

// The Ryu Printf interfaces for %.f, %.e, and %.g.
int d2fixed_buffered_n(double d, uint32_t precision, char* result);
void d2fixed_buffered(double d, uint32_t precision, char* result);
char* d2fixed(double d, uint32_t precision);
Expand All @@ -39,6 +40,10 @@ int d2exp_buffered_n(double d, uint32_t precision, char* result);
void d2exp_buffered(double d, uint32_t precision, char* result);
char* d2exp(double d, uint32_t precision);

int d2gen_buffered_n(double d, uint32_t precision, char* result);
void d2gen_buffered(double d, uint32_t precision, char* result);
char* d2gen(double d, uint32_t precision);

#ifdef __cplusplus
}
#endif
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