Function String_PrintfArgList

hlslparser/src/Engine.cpp:26–58

This version doesn't truncate and is simpler

// This version doesn't truncate and is simpler
int String_PrintfArgList(std::string& buffer, const char* format, va_list args)
{
    int n = 0;

    if (!String_HasChar(format, '%')) {
        buffer += format;
        n = (uint32_t)strlen(format);
    }
    else if (String_Equal(format, "%s")) {
        va_list tmp;
        va_copy(tmp, args);
        const char* text = va_arg(args, const char*);
        n = (uint32_t)strlen(text);
        buffer += text;
        va_end(tmp);
    }
    else {
        va_list tmp;
        va_copy(tmp, args);

        int len = vsnprintf(nullptr, 0, format, tmp);
        if (len >= 0) {
            size_t bufferLength = buffer.length();
            buffer.resize(bufferLength + len);
            vsnprintf((char*)buffer.data() + bufferLength, len + 1, format, tmp);

            n = len;
        }
        va_end(tmp);
    }

    return n;
}

// This version truncates but works on stack
int String_PrintfArgList(char* buffer, int size, const char* format, va_list args)