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48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* Copyright (C) 1991-2025 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 <pwd.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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/* Return the username of the caller.
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If S is not NULL, it points to a buffer of at least L_cuserid bytes
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into which the name is copied; otherwise, a static buffer is used. */
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char *
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cuserid (char *s)
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{
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static char name[L_cuserid];
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char buf[NSS_BUFLEN_PASSWD];
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struct passwd pwent;
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struct passwd *pwptr;
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if (__getpwuid_r (__geteuid (), &pwent, buf, sizeof (buf), &pwptr)
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|| pwptr == NULL)
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{
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if (s != NULL)
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s[0] = '\0';
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return s;
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}
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if (s == NULL)
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s = name;
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s[L_cuserid - 1] = '\0';
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return strncpy (s, pwptr->pw_name, L_cuserid - 1);
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}
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