CONTEXT_BEGBUF
| CONTEXT_BEGBUF);
pstr->tip_context = ((eflags & REG_NOTBOL) ? CONTEXT_BEGBUF
: CONTEXT_NEWLINE | CONTEXT_BEGBUF);
#define CONTEXT_ENDBUF (CONTEXT_BEGBUF << 1)
#define IS_BEGBUF_CONTEXT(c) ((c) & CONTEXT_BEGBUF)
mctx.input.tip_context = (eflags & REG_NOTBOL) ? CONTEXT_BEGBUF
: CONTEXT_NEWLINE | CONTEXT_BEGBUF;