jehanne/sys/src/lib/draw/scroll.c

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/*
* This file is part of the UCB release of Plan 9. It is subject to the license
* terms in the LICENSE file found in the top-level directory of this
* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
* part of the UCB release of Plan 9, including this file, may be copied,
* modified, propagated, or distributed except according to the terms contained
* in the LICENSE file.
*/
#include <u.h>
#include <lib9.h>
#include <envvars.h>
#include <draw.h>
int
mousescrollsize(int maxlines)
{
static int lines, pcnt;
char *mss;
if(lines == 0 && pcnt == 0){
mss = getenv("mousescrollsize");
if(mss){
if(strchr(mss, '%') != nil)
pcnt = atof(mss);
else
lines = atoi(mss);
free(mss);
}
if(lines == 0 && pcnt == 0)
lines = 1;
if(pcnt>=100)
pcnt = 100;
}
if(lines)
return lines;
return pcnt * maxlines/100.0;
}