11.4Schristos/* $NetBSD: compat_unsetenv.c,v 1.4 2015/01/20 18:31:24 christos Exp $ */ 21.1Schristos 31.1Schristos/* 41.1Schristos * Copyright (c) 1987, 1993 51.1Schristos * The Regents of the University of California. All rights reserved. 61.1Schristos * 71.1Schristos * Redistribution and use in source and binary forms, with or without 81.1Schristos * modification, are permitted provided that the following conditions 91.1Schristos * are met: 101.1Schristos * 1. Redistributions of source code must retain the above copyright 111.1Schristos * notice, this list of conditions and the following disclaimer. 121.1Schristos * 2. Redistributions in binary form must reproduce the above copyright 131.1Schristos * notice, this list of conditions and the following disclaimer in the 141.1Schristos * documentation and/or other materials provided with the distribution. 151.1Schristos * 3. Neither the name of the University nor the names of its contributors 161.1Schristos * may be used to endorse or promote products derived from this software 171.1Schristos * without specific prior written permission. 181.1Schristos * 191.1Schristos * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 201.1Schristos * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 211.1Schristos * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 221.1Schristos * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 231.1Schristos * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 241.1Schristos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 251.1Schristos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 261.1Schristos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 271.1Schristos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 281.1Schristos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 291.1Schristos * SUCH DAMAGE. 301.1Schristos */ 311.1Schristos 321.1Schristos#include <sys/cdefs.h> 331.1Schristos#if defined(LIBC_SCCS) && !defined(lint) 341.1Schristos#if 0 351.1Schristosstatic char sccsid[] = "from: @(#)setenv.c 8.1 (Berkeley) 6/4/93"; 361.1Schristos#else 371.4Schristos__RCSID("$NetBSD: compat_unsetenv.c,v 1.4 2015/01/20 18:31:24 christos Exp $"); 381.1Schristos#endif 391.1Schristos#endif /* LIBC_SCCS and not lint */ 401.1Schristos 411.1Schristos#define __LIBC12_SOURCE__ 421.1Schristos#include "namespace.h" 431.1Schristos 441.1Schristos#include <assert.h> 451.1Schristos#include <errno.h> 461.1Schristos#include <stdlib.h> 471.1Schristos#include <compat/include/stdlib.h> 481.1Schristos#include <string.h> 491.2Schristos#include <bitstring.h> 501.1Schristos#include "local.h" 511.1Schristos 521.1Schristos#ifdef __weak_alias 531.1Schristos__weak_alias(unsetenv,_unsetenv) 541.1Schristos#endif 551.1Schristos 561.3Stron#include "env.h" 571.1Schristos 581.1Schristos__warn_references(unsetenv, 591.1Schristos "warning: reference to compatibility unsetenv();" 601.1Schristos " include <stdlib.h> for correct reference") 611.1Schristos 621.1Schristos/* 631.1Schristos * unsetenv(name) -- 641.1Schristos * Delete environmental variable "name". 651.1Schristos */ 661.1Schristosvoid 671.1Schristosunsetenv(const char *name) 681.1Schristos{ 691.3Stron size_t l_name; 701.1Schristos 711.1Schristos _DIAGASSERT(name != NULL); 721.1Schristos 731.3Stron l_name = strlen(name); 741.3Stron if (__writelockenv()) { 751.3Stron ssize_t offset; 761.3Stron 771.3Stron while ((offset = __getenvslot(name, l_name, false)) != -1) { 781.3Stron char **p; 791.3Stron for (p = &environ[offset]; ; ++p) { 801.3Stron if ((*p = *(p + 1)) == NULL) 811.3Stron break; 821.3Stron } 831.3Stron } 841.3Stron (void)__unlockenv(); 851.3Stron } 861.1Schristos} 87