Initial commit

.gitignore

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+build

README.md

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+# intc
+A MIT licensed C/C++ uint128/256 type library, originally adapted from [calccrypto's uint128/256 library](https://github.com/calccrypto/uint256_t) turned into a primarily C first library and opt out C++ features when compiling in C++ mode.
+
+The overarching motivation of the library can be summed up as follows
+
+- Single header, drop in - no build configuration required.
+- Minimal dependencies (only depends on stdbool.h when compiling in C).
+- Zero allocations (in other libs typically when converting to strings).
+- Ability to rename the API via the pre-processor for tighter integration into C code bases
+- C++ features are optional and can be opt out via the pre-processor, i.e. operator overloading and constructors.
+
+## Usage
+Include `intc.h` and defined `INTC_IMPLEMENTATION` in one and only one file to enable the implementation in that translation unit.
+
+```cpp
+#define INTC_IMPLEMENTATION
+#include "intc.h"
+#include <stdio.h>
+
+int main(int, char**)
+{
+#if defined(__cplusplus)
+    intc_u256 value = 32;
+    value += 32;
+    if (value == 64)
+        value *= 1'000'000'000'000;
+    intc_u256_string string = intc_u256_readable_int_str(value);
+    printf("%.*s\n", string.size, string.str); // 64,000,000,000,000
+#else
+    intc_u256 value = INTC_U64_TO_U256(32);
+    value = intc_u256_add_u64(value, 32);
+    if (intc_u256_eq_u64(value, 64))
+        value = intc_u256_mul(value, INTC_U64_TO_U256(1'000'000'000'000));
+    intc_u256_string string = intc_u256_readable_int_str(value);
+    printf("%.*s\n", string.size, string.str); // 64,000,000,000,000
+#endif
+    return 0;
+}
+```
+
+## Tests
+Tests are adapted from calccrypto's test suite and can be built by running `build_tests.bat` for Windows and `build_tests.sh` for Unix. For Windows MSVC's cl compiler must be available on the path and GCC must be available on Unix.

build_tests.bat

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+@echo off
+
+set script_dir=%~dp0
+if not exist build mkdir build
+
+where /q cl || (
+    echo MSVC's cl compiler must be available on the path to build
+    goto :eof
+)
+
+REM MSVC cl build
+echo [SCRIPT] Building tests via cl to build\intc_tests_msvc.exe
+pushd build
+cl -nologo -O2 -D INTC_TESTS_WITH_MAIN -I %script_dir% -TP %script_dir%\intc_tests.h /Fe:intc_tests_msvc /link
+popd build
+
+REM Optional clang-cl build if we have the compiler on the path
+where /q clang-cl || goto :eof
+echo [SCRIPT] Building tests via clang-cl to build\intc_tests_clang.exe
+pushd build
+clang-cl -nologo -O2 -D INTC_TESTS_WITH_MAIN -I %script_dir% -TP %script_dir%\intc_tests.h /Fe:intc_tests_clang /link
+popd build
+