buffer_putsa - write stralloc to buffer and flush

       buffer_putsaflush is equivalent to buffer_putflush(b,x.s,x.len).

       buffer_putsa - write stralloc to buffer and flush

       0 if everything is fine, -1 on error (setting errno).

buffer_puts(3), buffer_flush(3), buffer(3)

                                                                                            buffer_putsaflush(3)

#include<libowfat/stralloc.h>#include<libowfat/buffer.h>

       int buffer_putsaflush(buffer* b,const stralloc* x);