Function parseFormatString

src/bin2llvmir/utils/llvm.cpp:423–782

* Parse format string @a format used in functions such as @c printf or @c scanf * into vector of data types in context of module @a module. * If @a calledFnc provided and called function name contains "scan" string, all * types are transformed to pointers. * @return Vector of data types used in format string. * * This is done according to: * http://www.cplusplus.com/reference/cstdio/printf/

 * http://www.cplusplus.com/reference/cstdio/scanf/
 */
std::vector<llvm::Type*> parseFormatString(
		llvm::Module* module,
		const std::string& format,
		llvm::Function* calledFnc)
{
	LLVMContext& ctx = module->getContext();
	std::vector<Type*> ret;

	const char *cp = format.c_str();
	size_t max_width_length = 0;
	size_t max_precision_length = 0;

	while (*cp != '\0')
	{
		char c = *cp++;
		if (c != '%')
		{
			continue;
		}

		// Test for positional argument.
		//
		if (*cp >= '0' && *cp <= '9')
		{
			const char *np;

			for (np = cp; *np >= '0' && *np <= '9'; np++) {};

			if (*np == '$')
			{
				size_t n = 0;
				for (np = cp; *np >= '0' && *np <= '9'; np++)
				{
					n += n*10 + *np - '0';
				}
				if (n == 0) // Positional argument 0.
				{
					return ret;
				}
				cp = np + 1;
			}
		}

		// Read the flags.
		//
		for (;;)
		{
			if (*cp == '\'')
			{
				cp++;
			}
			else if (*cp == '-')
			{
				cp++;
			}
			else if (*cp == '+')
			{
				cp++;