/* RESTRICT.C

This routine was written for programs intended for use on remote systems
or any other system where access must be limited to a certain range of
user areas. A program calls restrict(*argv) and restrict will only return
if the user number contained in *argv (if any) is less than or equal to
MAXUSR. Of course this routine has no practical application in any file
NOT compiled by BDS C v1.50 or higher. It was specifically written for
BDS C v1.50, since it is the latest BDS C and the only one to allow user
area specification without special code.

               Written by S. Kluger
               El Paso RCPM/CBBS
               (915) 598-1668
*/

#define MAXUSR 4        /* highest directly accessible user area */

restrict(fn)
char *fn;
{
       int fsl,usrar;
               usrar = 0;
               if ((fsl = matchr(fn,'/')) == 1)
               {
                       usrar = (fn[fsl-1] - '0');
               }else
               if ((fsl = matchr(fn,'/')) == 2)
               {
                       usrar=(fn[fsl-1]-'0') + ((fn[fsl-2]-'0') * 10);
               }
               if (usrar > MAXUSR){
                       printf("\nIllegal user area specified.\n");
                       exit();
               }
}

char matchr(st,ch)
char *st,ch;
{
       int i;
       for(i=0; st[i]; i++){
               if(st[i] == ch) return(i);
       }
       return(0);
}