projects / unix-history / blame
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|---|---|---|
| 0abe9750 KB |
1 | /* |
| 2 | * Copyright (c) 1989 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 1343342a | 5 | * %sccs.include.redist.c% |
| 0abe9750 KB |
6 | */ |
| 7 | ||
| 8 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 1343342a | 9 | static char sccsid[] = "@(#)pwcache.c 5.4 (Berkeley) %G%"; |
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10 | #endif /* LIBC_SCCS and not lint */ |
| 11 | ||
| 12 | #include <sys/types.h> | |
| 13 | #include <utmp.h> | |
| 14 | #include <pwd.h> | |
| 15 | #include <grp.h> | |
| de714f9f | 16 | #include <stdio.h> |
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17 | |
| 18 | #define NCACHE 64 /* power of 2 */ | |
| 19 | #define MASK NCACHE - 1 /* bits to store with */ | |
| 20 | ||
| c938998a MT |
21 | static int pwopen = 0; |
| 22 | static int gropen = 0; | |
| 23 | ||
| 0abe9750 | 24 | char * |
| de714f9f | 25 | user_from_uid(uid, nouser) |
| 0abe9750 | 26 | uid_t uid; |
| de714f9f | 27 | int nouser; |
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28 | { |
| 29 | static struct ncache { | |
| 30 | uid_t uid; | |
| 31 | char name[UT_NAMESIZE + 1]; | |
| 32 | } c_uid[NCACHE]; | |
| 33 | static char nbuf[15]; /* 32 bits == 10 digits */ | |
| 34 | register struct passwd *pw; | |
| 35 | register struct ncache *cp; | |
| 36 | ||
| 37 | cp = c_uid + (uid & MASK); | |
| 38 | if (cp->uid != uid || !*cp->name) { | |
| c938998a MT |
39 | if (pwopen == 0) { |
| 40 | setpassent(1); | |
| 41 | pwopen++; | |
| 42 | } | |
| 0abe9750 | 43 | if (!(pw = getpwuid(uid))) { |
| de714f9f KB |
44 | if (nouser) |
| 45 | return((char *)NULL); | |
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46 | (void)sprintf(nbuf, "%u", uid); |
| 47 | return(nbuf); | |
| 48 | } | |
| 49 | cp->uid = uid; | |
| 50 | (void)strncpy(cp->name, pw->pw_name, UT_NAMESIZE); | |
| 51 | cp->name[UT_NAMESIZE] = '\0'; | |
| 52 | } | |
| 53 | return(cp->name); | |
| 54 | } | |
| 55 | ||
| 56 | char * | |
| de714f9f | 57 | group_from_gid(gid, nogroup) |
| 0abe9750 | 58 | gid_t gid; |
| de714f9f | 59 | int nogroup; |
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60 | { |
| 61 | static struct ncache { | |
| 62 | gid_t gid; | |
| 63 | char name[UT_NAMESIZE]; | |
| 64 | } c_gid[NCACHE]; | |
| 65 | static char nbuf[15]; /* 32 bits == 10 digits */ | |
| 66 | register struct group *gr; | |
| 67 | register struct ncache *cp; | |
| 68 | ||
| 69 | cp = c_gid + (gid & MASK); | |
| 70 | if (cp->gid != gid || !*cp->name) { | |
| c938998a MT |
71 | if (gropen == 0) { |
| 72 | setgroupent(1); | |
| 73 | gropen++; | |
| 74 | } | |
| 0abe9750 | 75 | if (!(gr = getgrgid(gid))) { |
| de714f9f KB |
76 | if (nogroup) |
| 77 | return((char *)NULL); | |
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78 | (void)sprintf(nbuf, "%u", gid); |
| 79 | return(nbuf); | |
| 80 | } | |
| 81 | cp->gid = gid; | |
| 82 | (void)strncpy(cp->name, gr->gr_name, UT_NAMESIZE); | |
| 83 | cp->name[UT_NAMESIZE] = '\0'; | |
| 84 | } | |
| 85 | return(cp->name); | |
| 86 | } |