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63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <alloca.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <pwd.h>
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/* Re-construct the password-file line for the given uid
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in the given buffer. This knows the format that the caller
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will expect, but this need not be the format of the password file. */
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int __getpw (__uid_t uid, char *buf);
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int
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__getpw (__uid_t uid, char *buf)
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{
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size_t buflen;
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char *tmpbuf;
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struct passwd resbuf, *p;
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if (buf == NULL)
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{
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__set_errno (EINVAL);
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return -1;
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}
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buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
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tmpbuf = alloca (buflen);
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if (__getpwuid_r (uid, &resbuf, tmpbuf, buflen, &p) != 0)
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return -1;
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if (p == NULL)
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return -1;
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if (sprintf (buf, "%s:%s:%lu:%lu:%s:%s:%s", p->pw_name, p->pw_passwd,
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(unsigned long int) p->pw_uid, (unsigned long int) p->pw_gid,
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p->pw_gecos, p->pw_dir, p->pw_shell) < 0)
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return -1;
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return 0;
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}
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weak_alias (__getpw, getpw)
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link_warning (getpw, "the `getpw' function is dangerous and should not be used.")
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