Function char_buffer_read

modules/ssl/ssl_engine_io.c:348–369

Copy up to INL bytes from the char_buffer BUFFER into IN. Note * that due to the strange way this API is designed/used, the * char_buffer object is used to cache a segment of inctx->buffer, and * then this function called to copy (part of) that segment to the * beginning of inctx->buffer. So the segments to copy cannot be * presumed to be non-overlapping, and memmove must be used. */

 * beginning of inctx->buffer.  So the segments to copy cannot be
 * presumed to be non-overlapping, and memmove must be used. */
static int char_buffer_read(char_buffer_t *buffer, char *in, int inl)
{
    if (!buffer->length) {
        return 0;
    }

    if (buffer->length > inl) {
        /* we have enough to fill the caller's buffer */
        memmove(in, buffer->value, inl);
        buffer->value += inl;
        buffer->length -= inl;
    }
    else {
        /* swallow remainder of the buffer */
        memmove(in, buffer->value, buffer->length);
        inl = buffer->length;
        buffer->value = NULL;
        buffer->length = 0;
    }

    return inl;
}

static int char_buffer_write(char_buffer_t *buffer, char *in, int inl)
{