ref: 12fa017f3fc2687d3afb166fd30d9b134abb1da5
dir: /sys/src/cmd/auth/uniq.c/
#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); } void main(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); }