utilize st_blksize field to optimize size of reads and writes

[unix-history] / usr / src / lib / libc / stdio / setbuf.c

/* @(#)setbuf.c 4.2 (Berkeley) %G% */
#include        <stdio.h>

setbuf(iop, buf)
register struct _iobuf *iop;
char *buf;
{
       if (iop->_base != NULL && iop->_flag&_IOMYBUF)
               free(iop->_base);
       iop->_flag &= ~(_IOMYBUF|_IONBF|_IOLBF);
       if ((iop->_base = buf) == NULL) {
               iop->_flag |= _IONBF;
               iop->_bufsiz = NULL;
       } else {
               iop->_ptr = iop->_base;
               iop->_bufsiz = BUFSIZ;
       }
       iop->_cnt = 0;
}