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Annotation of 43BSDReno/lib/libutil/pwcache.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1989 The Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21: static char sccsid[] = "@(#)pwcache.c  5.4 (Berkeley) 6/1/90";
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: #include <sys/types.h>
                     25: #include <utmp.h>
                     26: #include <pwd.h>
                     27: #include <grp.h>
                     28: #include <stdio.h>
                     29: 
                     30: #define        NCACHE  64                      /* power of 2 */
                     31: #define        MASK    NCACHE - 1              /* bits to store with */
                     32: 
                     33: static int pwopen = 0;
                     34: static int gropen = 0;
                     35: 
                     36: char *
                     37: user_from_uid(uid, nouser)
                     38:        uid_t uid;
                     39:        int nouser;
                     40: {
                     41:        static struct ncache {
                     42:                uid_t   uid;
                     43:                char    name[UT_NAMESIZE + 1];
                     44:        } c_uid[NCACHE];
                     45:        static char nbuf[15];           /* 32 bits == 10 digits */
                     46:        register struct passwd *pw;
                     47:        register struct ncache *cp;
                     48: 
                     49:        cp = c_uid + (uid & MASK);
                     50:        if (cp->uid != uid || !*cp->name) {
                     51:                if (pwopen == 0) {
                     52:                        setpassent(1);
                     53:                        pwopen++;
                     54:                }
                     55:                if (!(pw = getpwuid(uid))) {
                     56:                        if (nouser)
                     57:                                return((char *)NULL);
                     58:                        (void)sprintf(nbuf, "%u", uid);
                     59:                        return(nbuf);
                     60:                }
                     61:                cp->uid = uid;
                     62:                (void)strncpy(cp->name, pw->pw_name, UT_NAMESIZE);
                     63:                cp->name[UT_NAMESIZE] = '\0';
                     64:        }
                     65:        return(cp->name);
                     66: }
                     67: 
                     68: char *
                     69: group_from_gid(gid, nogroup)
                     70:        gid_t gid;
                     71:        int nogroup;
                     72: {
                     73:        static struct ncache {
                     74:                gid_t   gid;
                     75:                char    name[UT_NAMESIZE];
                     76:        } c_gid[NCACHE];
                     77:        static char nbuf[15];           /* 32 bits == 10 digits */
                     78:        register struct group *gr;
                     79:        register struct ncache *cp;
                     80: 
                     81:        cp = c_gid + (gid & MASK);
                     82:        if (cp->gid != gid || !*cp->name) {
                     83:                if (gropen == 0) {
                     84:                        setgroupent(1);
                     85:                        gropen++;
                     86:                }
                     87:                if (!(gr = getgrgid(gid))) {
                     88:                        if (nogroup)
                     89:                                return((char *)NULL);
                     90:                        (void)sprintf(nbuf, "%u", gid);
                     91:                        return(nbuf);
                     92:                }
                     93:                cp->gid = gid;
                     94:                (void)strncpy(cp->name, gr->gr_name, UT_NAMESIZE);
                     95:                cp->name[UT_NAMESIZE] = '\0';
                     96:        }
                     97:        return(cp->name);
                     98: }

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