Add buffer to i/o batch
#include <iob.h>
void iob_adds_free(io_batch* b,const char* s);
iob_adds_free schedules the ASCIIZ C string s to be written with the I/O batch b.
iob_reset will deallocate the string automatically.
iob_reset(3), iob_send(3), iob_addbuf(3), iob_adds(3), iob_addfile(3)