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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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typedef struct Who Who;
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struct Who
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{
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	Who *next;
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	char *line;
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	char *name;
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};
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int cmp(void *arg1, void *arg2)
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{
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	Who **a = arg1, **b = arg2;
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	return strcmp((*a)->name, (*b)->name);
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}
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void
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main(int argc, char **argv)
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{
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	int changed, i, n;
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	Biobuf *b;
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	char *p, *name;
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	Who *first, *last, *w, *nw, **l;
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	if(argc != 2){
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		fprint(2, "usage: auth/uniq file\n");
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		exits(0);
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	}
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	last = first = 0;
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	b = Bopen(argv[1], OREAD);
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	if(b == 0)
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		exits(0);
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	n = 0;
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	changed = 0;
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	while(p = Brdline(b, '\n')){
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		p[Blinelen(b)-1] = 0;
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		name = p;
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		while(*p && *p != '|')
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			p++;
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		if(*p)
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			*p++ = 0;
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		for(nw = first; nw; nw = nw->next){
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			if(strcmp(nw->name, name) == 0){
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				free(nw->line);
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				nw->line = strdup(p);
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				changed = 1;
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				break;
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			}
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		}
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		if(nw)
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			continue;
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		w = malloc(sizeof(Who));
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		if(w == 0){
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			fprint(2, "auth/uniq: out of memory\n");
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			exits(0);
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		}
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		memset(w, 0, sizeof(Who));
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		w->name = strdup(name);
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		w->line = strdup(p);
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		if(first == 0)
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			first = w;
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		else
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			last->next = w;
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		last = w;
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		n++;
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	}
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	Bterm(b);
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	l = malloc(n*sizeof(Who*));
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	for(i = 0, nw = first; nw; nw = nw->next, i++)
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		l[i] = nw;
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	qsort(l, n, sizeof(Who*), cmp);
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	if(!changed)
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		exits(0);
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	b = Bopen(argv[1], OWRITE);
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	if(b == 0){
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		fprint(2, "auth/uniq: can't open %s\n", argv[1]);
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		exits(0);
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	}
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	for(i = 0; i < n; i++)
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		Bprint(b, "%s|%s\n", l[i]->name, l[i]->line);
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	Bterm(b);
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}