Method WriteF

source/Debugger.cpp:2417–2524

Write formatted data into the buffer. Supports %s (char*), %e (char*, "&'<> escaped), %i (int), %u (unsigned int), %p (UINT_PTR).

// Write formatted data into the buffer. Supports %s (char*), %e (char*, "&'<> escaped), %i (int), %u (unsigned int), %p (UINT_PTR).
int Debugger::Buffer::WriteF(const char *aFormat, ...)
{
	if (mFailed)
	{
		// A prior Write() failed and the now-invalid data hasn't yet been cleared
		// from the buffer.  Abort.  This allows numerous other parts of the code
		// to omit error-checking.
		return DEBUGGER_E_INTERNAL_ERROR;
	}

	int i;
	size_t len;
	char c;
	const char *format_ptr, *s, *param_ptr, *entity;
	char number_buf[MAX_INTEGER_SIZE];
	va_list vl;
	
	for (len = 0, i = 0; i < 2; ++i)
	{
		va_start(vl, aFormat);

		// Calculate the required buffer size.
		for (format_ptr = aFormat; c = *format_ptr; ++format_ptr)
		{
			if (c == '%')
			{
				switch (format_ptr[1])
				{
				case 's': s = va_arg(vl, char*); break;
				case 'i': s = _itoa(va_arg(vl, int), number_buf, 10); break;
				case 'u': s = _ultoa(va_arg(vl, unsigned long), number_buf, 10); break;
				case 'p': s = Exp32or64(_ultoa,_ui64toa)(va_arg(vl, UINT_PTR), number_buf, 10); break;

				case 'e': // String, replace "&'<> with appropriate XML entity.
				{
					s = va_arg(vl, char*);
					if (i == 0)
					{
						for (param_ptr = s; *param_ptr; ++param_ptr)
						{
							switch (*param_ptr)
							{
							case '"': case '\'':	len += 6; break; // &quot; or &apos;
							case '&':				len += 5; break; // &amp;
							case '<': case '>':		len += 4; break; // &lt; or &gt;
							default: ++len;
							}
						}
					}
					else
					{
						for (param_ptr = s; c = *param_ptr; ++param_ptr)
						{
							switch (c)
							{
							case '"': entity = "quot"; break;
							case '\'': entity = "apos"; break;
							case '&': entity = "amp"; break;