ece282/lab04/gid_to_name.c

#include        <grp.h>
#include	<stddef.h>
#include	<stdio.h>

char *gid_to_name( gid_t gid )
/*
 *      returns pointer to group number gid. used getgrgid(3)
 */
{
        struct group *getgrgid(), *grp_ptr;
        static  char numstr[10];

        if ( ( grp_ptr = getgrgid(gid) ) == NULL ){
                sprintf(numstr,"%d", gid);
                return numstr;
        }
        else
                return grp_ptr->gr_name;
}