feat(string): add SStrToInt

storm/String.cpp

@@ -288,3 +288,27 @@ const char* SStrStr(const char* string, const char* search) {
 
     return substring;
 }
+
+int32_t SStrToInt(const char* string) {
+    STORM_ASSERT(string);
+
+    int32_t result = 0;
+    bool negative = false;
+
+    if (*string == '-') {
+        negative = true;
+        string++;
+    }
+
+    uint32_t digit;
+    while ((digit = *string - '0') < 10) {
+        result = digit + (10 * result);
+        string++;
+    }
+
+    if (negative) {
+        result = -result;
+    }
+
+    return result;
+}

storm/String.hpp

@@ -27,4 +27,6 @@ void SStrLower(char* string);
 
 const char* SStrStr(const char* string, const char* search);
 
+int32_t SStrToInt(const char* string);
+
 #endif

test/String.cpp

@@ -217,3 +217,47 @@ TEST_CASE("SStrStr", "[string]") {
         REQUIRE(substring == nullptr);
     }
 }
+
+TEST_CASE("SStrToInt", "[string]") {
+    SECTION("converts empty string to int") {
+        auto string = "";
+        auto result = SStrToInt(string);
+        REQUIRE(result == 0);
+    }
+
+    SECTION("converts whitespace string to int") {
+        auto string = " ";
+        auto result = SStrToInt(string);
+        REQUIRE(result == 0);
+    }
+
+    SECTION("converts string with positive number to int") {
+        auto string = "123";
+        auto result = SStrToInt(string);
+        REQUIRE(result == 123);
+    }
+
+    SECTION("converts string with negative number to int") {
+        auto string = "-123";
+        auto result = SStrToInt(string);
+        REQUIRE(result == -123);
+    }
+
+    SECTION("converts string with zero to int") {
+        auto string = "0";
+        auto result = SStrToInt(string);
+        REQUIRE(result == 0);
+    }
+
+    SECTION("converts string with leading zero to int") {
+        auto string = "01";
+        auto result = SStrToInt(string);
+        REQUIRE(result == 1);
+    }
+
+    SECTION("converts string with two whitespace-separated numbers to int") {
+        auto string = "123 456";
+        auto result = SStrToInt(string);
+        REQUIRE(result == 123);
+    }
+}