tnoworld.c - plan9port - [fork] Plan 9 from user space
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       ---
       tnoworld.c (779B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <bio.h>
            4 #include <auth.h>
            5 
            6 /*
            7  *  see if user is in the group noworld, i.e., has all file
            8  *  priviledges masked with 770, and all directories with
            9  *  771, before checking access rights
           10  */
           11 int
           12 noworld(char *user)
           13 {
           14         Biobuf *b;
           15         char *p;
           16         int n;
           17 
           18         b = Bopen("/adm/users", OREAD);
           19         if(b == nil)
           20                 return 0;
           21         while((p = Brdline(b, '\n')) != nil){
           22                 p[Blinelen(b)-1] = 0;
           23                 p = strchr(p, ':');
           24                 if(p == nil)
           25                         continue;
           26                 if(strncmp(p, ":noworld:", 9) == 0){
           27                         p += 9;
           28                         break;
           29                 }
           30         }
           31         n = strlen(user);
           32         while(p != nil && *p != 0){
           33                 p = strstr(p, user);
           34                 if(p == nil)
           35                         break;
           36                 if(*(p-1) == ':' || *(p-1) == ',')
           37                 if(*(p+n) == ':' || *(p+n) == ',' || *(p+n) == 0){
           38                         Bterm(b);
           39                         return 1;
           40                 }
           41                 p++;
           42         }
           43         Bterm(b);
           44         return 0;
           45 }