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