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ref: 81cbff917f965bf7fab35cb42d68ebf14a880aa5
parent: 57ad566dfc30b250229852619fc1073d47375dfa
author: cinap_lenrek <[email protected]>
date: Fri Apr 17 02:18:43 EDT 2015

gs: avoid 6c type propagation / constant folding issue for set_cb_end()

6c changed "- cmd_lagest_size + 1" into a *unsigned* 32bit constant. which
got added to 64bit pointer making pcb->limit > pcb->end resulting
in errors for partial commands in the buffer. removing the parentesis
propagates the operation to 64bit.

--- a/sys/src/cmd/gs/src/gxclrast.c

+++ b/sys/src/cmd/gs/src/gxclrast.c

@@ -119,7 +119,7 @@

 set_cb_end(command_buf_t *pcb, const byte *end)

 {

     pcb->end = end;

-    pcb->limit = pcb->data + (pcb->size - cmd_largest_size + 1);

+    pcb->limit = pcb->data + pcb->size - cmd_largest_size + 1;

     if ( pcb->limit > pcb->end )

 	pcb->limit = pcb->end;

 }