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Initial check-in based on 2.1.5 (SGI IRIX) source tree.

/*
 *	ifilbuf -
 *
 *				Paul Haeberli - 1984
 *
 */
#include	"image.h"

int ifilbuf(IMAGE *image)
{
	int size;

	if ((image->flags&_IOREAD) == 0)
		return(EOF);
	if (image->base==NULL) {
		size = IBUFSIZE(image->xsize);
		if ((image->base = ibufalloc(image)) == NULL) {
			i_errhdlr("can't alloc image buffer\n");
			return EOF;
		}
	}
	image->cnt = getrow(image,image->base,image->y,image->z);
	image->ptr = image->base;
	if (--image->cnt < 0) {
		if (image->cnt == -1) {
			image->flags |= _IOEOF;
			if (image->flags & _IORW)
				image->flags &= ~_IOREAD;
		} else
			image->flags |= _IOERR;
		image->cnt = 0;
		return -1;
	}
	if(++image->y >= image->ysize) {
	    image->y = 0;
	    if(++image->z >= image->zsize) {
		image->z = image->zsize-1;
		image->flags |= _IOEOF;
		return -1;
	    }
	}
	return *image->ptr++ & 0xffff;
}