Question about parserutils_buffer_discard

Hi everyone,

I have a question about the function parserutils_buffer_discard.

As i understand, it is meant to "discard" some data from the buffer :

---------------------------------------------------------------

|                                  |xxxx|                    |

|                                  |xxxx|                    |

|---------------------------------------------------------------

s--------------------------------o-------l------------------->

s being start, o offset, and length, the amount of bytes to disard.

The memmove being done is :

memmove(buffer->data + offset, buffer->data + offset + len, buffer->length - len);

I wonder why you would move more data than what's left in the buffer ?

As i understand the situation, there is buffer->length-(offset+len) bytes left, my question is, why not do this :

memmove(buffer->data + offset, buffer->data + offset + len, buffer->length - (offset + len));

Thanks in advance for your responses,

Regards,

adema