riemann.fmi.uni-sofia.bg/programs/nlogin-0.3-pre/nv_getgrouplist.c


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#include <grp.h>
#include "pw_defs.h"

int nv_getgrouplist(const char*user, gid_t group, gid_t*groups, int*ngroups) /*EXTRACT_INCL*/ {
  long n=0,size=*ngroups;
  struct group*g;
  int ret=0;

  if (0<size) { groups[n++]=group; }
  else { *ngroups=0; return (-1); }

  nv_setgrent();
  while ((g=nv_getgrent())) {
    char **duh;
    if (g->gr_gid==group) continue;
    duh=g->gr_mem;
    while (*duh) {
      if (!str_diff(*duh,user)) {
	if (n>=size) {
	  ret=~ret;
	  goto err_out;
	}
	groups[n++]=g->gr_gid;
	break;
      }
      duh++;
    }
  }
err_out:
  nv_endgrent();
  *ngroups=n;
  return ret;
}