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Diffstat (limited to 'lib/libutil/pwcache.c')
| -rw-r--r-- | lib/libutil/pwcache.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/lib/libutil/pwcache.c b/lib/libutil/pwcache.c new file mode 100644 index 000000000000..ad6df2ed3cee --- /dev/null +++ b/lib/libutil/pwcache.c @@ -0,0 +1,112 @@ +/* + * Copyright (c) 1989 The Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)pwcache.c 5.4 (Berkeley) 6/1/90"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> +#include <utmp.h> +#include <pwd.h> +#include <grp.h> +#include <stdio.h> + +#define NCACHE 64 /* power of 2 */ +#define MASK NCACHE - 1 /* bits to store with */ + +static int pwopen = 0; +static int gropen = 0; + +char * +user_from_uid(uid, nouser) + uid_t uid; + int nouser; +{ + static struct ncache { + uid_t uid; + char name[UT_NAMESIZE + 1]; + } c_uid[NCACHE]; + static char nbuf[15]; /* 32 bits == 10 digits */ + register struct passwd *pw; + register struct ncache *cp; + + cp = c_uid + (uid & MASK); + if (cp->uid != uid || !*cp->name) { + if (pwopen == 0) { + setpassent(1); + pwopen++; + } + if (!(pw = getpwuid(uid))) { + if (nouser) + return((char *)NULL); + (void)sprintf(nbuf, "%u", uid); + return(nbuf); + } + cp->uid = uid; + (void)strncpy(cp->name, pw->pw_name, UT_NAMESIZE); + cp->name[UT_NAMESIZE] = '\0'; + } + return(cp->name); +} + +char * +group_from_gid(gid, nogroup) + gid_t gid; + int nogroup; +{ + static struct ncache { + gid_t gid; + char name[UT_NAMESIZE]; + } c_gid[NCACHE]; + static char nbuf[15]; /* 32 bits == 10 digits */ + register struct group *gr; + register struct ncache *cp; + + cp = c_gid + (gid & MASK); + if (cp->gid != gid || !*cp->name) { + if (gropen == 0) { + setgroupent(1); + gropen++; + } + if (!(gr = getgrgid(gid))) { + if (nogroup) + return((char *)NULL); + (void)sprintf(nbuf, "%u", gid); + return(nbuf); + } + cp->gid = gid; + (void)strncpy(cp->name, gr->gr_name, UT_NAMESIZE); + cp->name[UT_NAMESIZE] = '\0'; + } + return(cp->name); +} |