projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 69724a11 WJ |
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, with or without | |
| 6 | * modification, are permitted provided that the following conditions | |
| 7 | * are met: | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * 3. All advertising materials mentioning features or use of this software | |
| 14 | * must display the following acknowledgement: | |
| 15 | * This product includes software developed by the University of | |
| 16 | * California, Berkeley and its contributors. | |
| 17 | * 4. Neither the name of the University nor the names of its contributors | |
| 18 | * may be used to endorse or promote products derived from this software | |
| 19 | * without specific prior written permission. | |
| 20 | * | |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 31 | * SUCH DAMAGE. | |
| 32 | */ | |
| 33 | ||
| 34 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 35 | static char sccsid[] = "@(#)pwcache.c 5.4 (Berkeley) 6/1/90"; | |
| 36 | #endif /* LIBC_SCCS and not lint */ | |
| 37 | ||
| 38 | #include <sys/types.h> | |
| 39 | #include <utmp.h> | |
| 40 | #include <pwd.h> | |
| 41 | #include <grp.h> | |
| 42 | #include <stdio.h> | |
| 43 | ||
| 44 | #define NCACHE 64 /* power of 2 */ | |
| 45 | #define MASK NCACHE - 1 /* bits to store with */ | |
| 46 | ||
| 47 | static int pwopen = 0; | |
| 48 | static int gropen = 0; | |
| 49 | ||
| 50 | char * | |
| 51 | user_from_uid(uid, nouser) | |
| 52 | uid_t uid; | |
| 53 | int nouser; | |
| 54 | { | |
| 55 | static struct ncache { | |
| 56 | uid_t uid; | |
| 57 | char name[UT_NAMESIZE + 1]; | |
| 58 | } c_uid[NCACHE]; | |
| 59 | static char nbuf[15]; /* 32 bits == 10 digits */ | |
| 60 | register struct passwd *pw; | |
| 61 | register struct ncache *cp; | |
| 62 | ||
| 63 | cp = c_uid + (uid & MASK); | |
| 64 | if (cp->uid != uid || !*cp->name) { | |
| 65 | if (pwopen == 0) { | |
| 66 | setpassent(1); | |
| 67 | pwopen++; | |
| 68 | } | |
| 69 | if (!(pw = getpwuid(uid))) { | |
| 70 | if (nouser) | |
| 71 | return((char *)NULL); | |
| 72 | (void)sprintf(nbuf, "%u", uid); | |
| 73 | return(nbuf); | |
| 74 | } | |
| 75 | cp->uid = uid; | |
| 76 | (void)strncpy(cp->name, pw->pw_name, UT_NAMESIZE); | |
| 77 | cp->name[UT_NAMESIZE] = '\0'; | |
| 78 | } | |
| 79 | return(cp->name); | |
| 80 | } | |
| 81 | ||
| 82 | char * | |
| 83 | group_from_gid(gid, nogroup) | |
| 84 | gid_t gid; | |
| 85 | int nogroup; | |
| 86 | { | |
| 87 | static struct ncache { | |
| 88 | gid_t gid; | |
| 89 | char name[UT_NAMESIZE]; | |
| 90 | } c_gid[NCACHE]; | |
| 91 | static char nbuf[15]; /* 32 bits == 10 digits */ | |
| 92 | register struct group *gr; | |
| 93 | register struct ncache *cp; | |
| 94 | ||
| 95 | cp = c_gid + (gid & MASK); | |
| 96 | if (cp->gid != gid || !*cp->name) { | |
| 97 | if (gropen == 0) { | |
| 98 | setgroupent(1); | |
| 99 | gropen++; | |
| 100 | } | |
| 101 | if (!(gr = getgrgid(gid))) { | |
| 102 | if (nogroup) | |
| 103 | return((char *)NULL); | |
| 104 | (void)sprintf(nbuf, "%u", gid); | |
| 105 | return(nbuf); | |
| 106 | } | |
| 107 | cp->gid = gid; | |
| 108 | (void)strncpy(cp->name, gr->gr_name, UT_NAMESIZE); | |
| 109 | cp->name[UT_NAMESIZE] = '\0'; | |
| 110 | } | |
| 111 | return(cp->name); | |
| 112 | } |