Buffers

Use selections instead, if you can. Buffers rely on prior agreement as the the interpretation of passed data.

X provides eight buffers in which a client program may store data. They are numbered 0 - 7 and may be accessed explicitly or one after another in a cycle.

XStoreBytes(display,bytes, length) /* STORE IN BUFFER ZERO              */
    char *bytes;    /* NOT necessarily ascii or null-terminated */
    int length;              /* number of bytes                 */

char *XFetchBytes(display,nbytes)  /* RECALL BUFFER ZERO                */
    int *nbytes;             /* RETURN                          */

XRotateBuffers(display,n) /* MOVE THEM ROUND BY n STEPS 0 -> n MOD 8    */
    int n;        /* 1 -> (n+1) MOD 8    ETC                    */

XStoreBuffer(display,bytes, nbytes, buffer) /* STORE IN SPECIFIED BUFFER*/
    char *bytes;    /* NOT necessarily ascii or null-terminated */
    int nbytes;              /* number of bytes                 */
    int buffer;              /* buffer to use                   */

char *XFetchBuffer(display,nbytes, buffer) /* RECALL SPECIFIED BUFFER   */
    int *nbytes;             /* RETURN                          */
    int buffer;              /* buffer to use                   */