Start development on BSD 2

[unix-history] / .ref-BSD-1 / portlib / __makbuf.c

# include       "iodec.h"

/**
**     allocate buffer space for a file
**/

__makbuf(fn, type)
int     fn;
int     type;
{
       register struct fileps  *fp;
       register int            size;
       register char           *space;
       int                     peeksize;

       peeksize = 0;
       if (type <= 0 || type > 2)
               peeksize = __param.peeksize;
       fp = &__filehdr[fn];
       fp->eoferr = fp->nchars = 0;
       fp->wrflag = type + 1;
       size = 1;
       if (fn > 2)
               size = __param.bufsize;
       for (fp->buff = 0; ; size =/ 4)
       {
               if ((space = alloc(size + peeksize)) != -1)
               {
                       fp->bsize = size;
                       fp->buff = fp->bptr = space + peeksize;
                       fp->pbuff = space;
                       break;
               }
               if (size < 16)
                       break;
       }
       if (fp->buff == 0)
               {
               fp->pbuff = &__statbuf[fn];
               fp->buff = fp->bptr = fp->pbuff + 1;
               fp->bsize = 1;
               }
}