sys/src/libdraw/scroll.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <draw.h>
   4
   5 int
   6 mousescrollsize(int maxlines)
   7 {
   8         static int lines, pcnt;
   9         char *mss;
  10
  11         if(lines == 0 && pcnt == 0){
  12                 mss = getenv("mousescrollsize");
  13                 if(mss){
  14                         if(strchr(mss, '%') != nil)
  15                                 pcnt = atof(mss);
  16                         else
  17                                 lines = atoi(mss);
  18                         free(mss);
  19                 }
  20                 if(lines == 0 && pcnt == 0)
  21                         lines = 1;
  22                 if(pcnt>=100)
  23                         pcnt = 100;
  24         }
  25
  26         if(lines)
  27                 return lines;
  28         return pcnt * maxlines/100.0;
  29 }