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buffer_getn(3)        DragonFly Library Functions Manual        buffer_getn(3)

NAME
       buffer_getn - read binary data from buffer

SYNTAX
       #include <buffer.h>

       ssize_t buffer_getn(buffer* b,char* x,size_t len);

DESCRIPTION
       buffer_getn copies data to x[0], x[1], ..., x[len-1] from the buffer,
       calling buffer_feed as needed, and returns len.

       If a read error occurs, buffer_getn returns -1 and sets errno
       appropriately.  It may then have put any number between 0 and len in
       the buffer, you can't tell.  That makes this function only useful if
       you don't care when an error occurs.  Use buffer_get otherwise.

       If the read operation signals end-of-file before len bytes were read,
       buffer_getn returns the number of bytes read from the buffer before
       end-of-file.

SEE ALSO
       buffer_init(3), buffer_get(3), buffer(3)

                                                                buffer_getn(3)