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feat(str): add SStrToDouble

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Adam Heinermann 2025-08-31 16:40:16 -07:00 • committed by fallenoak
parent 2408166d5d
commit 75dc4e57a6
3 changed files with 189 additions and 0 deletions
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99
storm/String.cpp
View file

@ -553,6 +553,105 @@ void SStrTokenize(const char** string, char* buffer, size_t bufferchars, const c
}
}
double SStrToDouble(const char* string) {
STORM_VALIDATE_BEGIN;
STORM_VALIDATE(string);
STORM_VALIDATE_END;
SStrInitialize();
double result;
bool negative = false;
if (*string == '-') {
negative = true;
string++;
}
double v16 = 10.0;
double v4 = 0.0;
uint32_t v5 = *string - '0';
const char* v6 = string;
if (v5 >= 10) {
v5 = 0;
result = static_cast<double>(v5);
} else {
string++;
uint32_t v8 = *string - '0';
if (v8 >= 10) {
result = static_cast<double>(v5);
} else {
do {
v5 = v8 + 10 * v5;
string++;
if (v5 >= 0x19999999) {
v4 = v4 * pow(10.0, string - v6) + static_cast<double>(v5);
v5 = 0;
v6 = string;
}
v8 = *string - '0';
} while (v8 < 10);
if (v4 == 0.0) {
result = static_cast<double>(v5);
} else {
result = pow(10.0, string - v6) * v4 + static_cast<double>(v5);
}
}
}
if (*string == '.') {
string++;
uint32_t v23 = *string - '0';
int32_t v24 = 0;
if (v23 < 10) {
int32_t v25 = 0;
int32_t v26 = -1;
double v31;
do {
string++;
if (v24 < 20) {
v31 = s_realDigit[0][v25 + v23];
} else {
v31 = pow(v16, v26) * v23;
}
result += v31;
v23 = *string - '0';
v24++;
v26--;
v25 += 10;
} while (v23 < 10);
}
}
if (*string == 'e' || *string == 'E') {
const char* v32 = string + 1;
if (*v32 == '+') {
v32++;
}
result *= pow(10.0, SStrToInt(v32));
}
if (negative) {
result = -result;
}
return result;
}
float SStrToFloat(const char* string) {
STORM_VALIDATE_BEGIN;
STORM_VALIDATE(string);

2
storm/String.hpp
View file

@ -37,6 +37,8 @@ const char* SStrStr(const char* string, const char* search);
void SStrTokenize(const char** string, char* buffer, size_t bufferchars, const char* whitespace, int32_t* quoted);
double SStrToDouble(const char* string);
float SStrToFloat(const char* string);
int32_t SStrToInt(const char* string);

88
test/String.cpp
View file

@ -2,6 +2,7 @@
#include "storm/Memory.hpp"
#include "test/Test.hpp"
#include <cfloat>
#include <type_traits>
@ -487,6 +488,84 @@ TEST_CASE("SStrTokenize", "[string]") {
}
}
TEST_CASE("SStrToDouble", "[string]") {
SECTION("converts empty string to double") {
auto result = SStrToDouble("");
REQUIRE(result == 0.0f);
}
SECTION("converts whitespace string to double") {
auto result = SStrToDouble(" \t\r\n");
REQUIRE(result == 0.0f);
}
SECTION("converts random characters to double") {
auto result = SStrToDouble("abcd");
REQUIRE(result == 0.0f);
}
SECTION("converts string with positive int to double") {
auto result = SStrToDouble("123");
REQUIRE(result == 123.0f);
}
SECTION("converts string with negative int to double") {
auto result = SStrToDouble("-123");
REQUIRE(result == -123.0f);
}
SECTION("converts string with positive float to double") {
auto result = SStrToDouble("1.5");
REQUIRE(result == 1.5f);
}
SECTION("converts string with negative float to double") {
auto result = SStrToDouble("-1.5");
REQUIRE(result == -1.5f);
}
SECTION("converts string with float and positive exponent to double") {
auto result = SStrToDouble("1.5e3");
REQUIRE(result == 1500.0f);
}
SECTION("converts string with float and positive full form exponent to double") {
auto result = SStrToDouble("1.5e+3");
REQUIRE(result == 1500.0f);
}
SECTION("converts string with capital exponent to double") {
auto result = SStrToDouble("1.5E+3");
REQUIRE(result == 1500.0f);
}
SECTION("converts string with random added letter to double") {
auto result = SStrToDouble("1.5g3");
REQUIRE(result == 1.5f);
}
SECTION("converts string with float and negative exponent to double") {
auto result = SStrToDouble("1500.0e-3");
REQUIRE(result == 1.5f);
}
SECTION("converts string with zero to double") {
auto result = SStrToDouble("0");
REQUIRE(result == 0.0f);
}
SECTION("converts string with leading zero to double") {
auto result = SStrToDouble("01");
REQUIRE(result == 1.0f);
}
SECTION("converts large values to infinity") {
// beyond max double
REQUIRE(SStrToDouble("1.79769e+310") == HUGE_VAL);
REQUIRE(SStrToDouble("-1.79769e+310") == -HUGE_VAL);
}
}
TEST_CASE("SStrToFloat", "[string]") {
SECTION("converts empty string to float") {
auto result = SStrToFloat("");
@ -557,6 +636,15 @@ TEST_CASE("SStrToFloat", "[string]") {
auto result = SStrToFloat("01");
REQUIRE(result == 1.0f);
}
SECTION("converts large values to infinity") {
// max double
REQUIRE(SStrToFloat("1.79769e+308") == HUGE_VALF);
// beyond max double
REQUIRE(SStrToFloat("1.79769e+310") == HUGE_VALF);
REQUIRE(SStrToFloat("-1.79769e+310") == -HUGE_VALF);
}
}
TEST_CASE("SStrToInt", "[string]") {