sys/src/cmd/auth/uniq.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <bio.h>
   4
   5 typedef struct Who Who;
   6 struct Who
   7 {
   8         Who *next;
   9         char *line;
  10         char *name;
  11 };
  12
  13 int cmp(void *arg1, void *arg2)
  14 {
  15         Who **a = arg1, **b = arg2;
  16
  17         return strcmp((*a)->name, (*b)->name);
  18 }
  19
  20 void
  21 main(int argc, char **argv)
  22 {
  23         int changed, i, n;
  24         Biobuf *b;
  25         char *p, *name;
  26         Who *first, *last, *w, *nw, **l;
  27
  28         if(argc != 2){
  29                 fprint(2, "usage: auth/uniq file\n");
  30                 exits(0);
  31         }
  32
  33         last = first = 0;
  34         b = Bopen(argv[1], OREAD);
  35         if(b == 0)
  36                 exits(0);
  37
  38         n = 0;
  39         changed = 0;
  40         while(p = Brdline(b, '\n')){
  41                 p[Blinelen(b)-1] = 0;
  42                 name = p;
  43                 while(*p && *p != '|')
  44                         p++;
  45                 if(*p)
  46                         *p++ = 0;
  47
  48                 for(nw = first; nw; nw = nw->next){
  49                         if(strcmp(nw->name, name) == 0){
  50                                 free(nw->line);
  51                                 nw->line = strdup(p);
  52                                 changed = 1;
  53                                 break;
  54                         }
  55                 }
  56                 if(nw)
  57                         continue;
  58
  59                 w = malloc(sizeof(Who));
  60                 if(w == 0){
  61                         fprint(2, "auth/uniq: out of memory\n");
  62                         exits(0);
  63                 }
  64                 memset(w, 0, sizeof(Who));
  65                 w->name = strdup(name);
  66                 w->line = strdup(p);
  67                 if(first == 0)
  68                         first = w;
  69                 else
  70                         last->next = w;
  71                 last = w;
  72                 n++;
  73         }
  74         Bterm(b);
  75
  76         l = malloc(n*sizeof(Who*));
  77         for(i = 0, nw = first; nw; nw = nw->next, i++)
  78                 l[i] = nw;
  79         qsort(l, n, sizeof(Who*), cmp);
  80
  81         if(!changed)
  82                 exits(0);
  83
  84         b = Bopen(argv[1], OWRITE);
  85         if(b == 0){
  86                 fprint(2, "auth/uniq: can't open %s\n", argv[1]);
  87                 exits(0);
  88         }
  89         for(i = 0; i < n; i++)
  90                 Bprint(b, "%s|%s\n", l[i]->name, l[i]->line);
  91         Bterm(b);
  92 }