Function stb__match

tutorials/common/imgui/imgui_draw.cpp:3961–3968

static const unsigned char *stb__barrier_in_b;
static unsigned char *stb__dout;
static void stb__match(const unsigned char *data, unsigned int length)
{
    // INVERSE of memmove... write each byte before copying the next...
    IM_ASSERT(stb__dout + length <= stb__barrier_out_e);
    if (stb__dout + length > stb__barrier_out_e) { stb__dout += length; return; }
    if (data < stb__barrier_out_b) { stb__dout = stb__barrier_out_e+1; return; }
    while (length--) *stb__dout++ = *data++;
}

static void stb__lit(const unsigned char *data, unsigned int length)
{