source: trunk/src/testing/app/bitplay/libimage/flsbuf.c @ 4

/******************************************************************************
 * SAGE - Scalable Adaptive Graphics Environment
 *
 * Copyright (C) 2004 Electronic Visualization Laboratory,
 * University of Illinois at Chicago
 *
 * All rights reserved.
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/*
 *      iflsbuf -
 *
 *                              Paul Haeberli - 1984
 *
 */
#include        "image.h"

int iflsbuf( IMAGE *image, IMushort c )
{
        register IMushort *base;
        register int n, rn;
        int size;

        if ((image->flags&_IOWRT)==0)
                return(EOF);
        if ((base=image->base)==NULL) {
                size = IBUFSIZE(image->xsize);
                if ((image->base=base=ibufalloc(image)) == NULL) {
                        i_errhdlr("flsbuf: error on buf alloc\n");
                        return EOF;
                }
                rn = n = 0;
        } else if ((rn = n = image->ptr - base) > 0)  {
                        n = putrow(image,base,image->y,image->z);
                        if(++image->y >= image->ysize) {
                            image->y = 0;
                            if(++image->z >= image->zsize) {
                                image->z = image->zsize-1;
                                image->flags |= _IOEOF;
                                return -1;
                            }
                        }
        }
        image->cnt = image->xsize-1;
        *base++ = c;
        image->ptr = base;
        if (rn != n) {
                image->flags |= _IOERR;
                return(EOF);
        }
        return(c);
}