/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <bio.h> typedef struct Who Who;struct Who{	Who *next;	char *line;	char *name;}; int cmp(void *arg1, void *arg2){	Who **a = arg1, **b = arg2; 	return strcmp((*a)->name, (*b)->name);} voidmain(int argc, char **argv){	int changed, i, n;	Biobuf *b;	char *p, *name;	Who *first, *last, *w, *nw, **l; 	if(argc != 2){		fprint(2, "usage: auth/uniq file\n");		exits(0);	} 	last = first = 0;	b = Bopen(argv[1], OREAD);	if(b == 0)		exits(0); 	n = 0;	changed = 0;	while(p = Brdline(b, '\n')){		p[Blinelen(b)-1] = 0;		name = p;		while(*p && *p != '|')			p++;		if(*p)			*p++ = 0; 		for(nw = first; nw; nw = nw->next){			if(strcmp(nw->name, name) == 0){				free(nw->line);				nw->line = strdup(p);				changed = 1;				break;			}		}		if(nw)			continue; 		w = malloc(sizeof(Who));		if(w == 0){			fprint(2, "auth/uniq: out of memory\n");			exits(0);		}		memset(w, 0, sizeof(Who));		w->name = strdup(name);		w->line = strdup(p);		if(first == 0)			first = w;		else			last->next = w;		last = w;		n++;	}	Bterm(b); 	l = malloc(n*sizeof(Who*));	for(i = 0, nw = first; nw; nw = nw->next, i++)		l[i] = nw;	qsort(l, n, sizeof(Who*), cmp); 	if(!changed)		exits(0); 	b = Bopen(argv[1], OWRITE);	if(b == 0){		fprint(2, "auth/uniq: can't open %s\n", argv[1]);		exits(0);	}	for(i = 0; i < n; i++)		Bprint(b, "%s|%s\n", l[i]->name, l[i]->line);	Bterm(b);}