155682Smarkm/* 255682Smarkm * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska H�gskolan 355682Smarkm * (Royal Institute of Technology, Stockholm, Sweden). 455682Smarkm * All rights reserved. 555682Smarkm * 655682Smarkm * Redistribution and use in source and binary forms, with or without 755682Smarkm * modification, are permitted provided that the following conditions 855682Smarkm * are met: 955682Smarkm * 1055682Smarkm * 1. Redistributions of source code must retain the above copyright 1155682Smarkm * notice, this list of conditions and the following disclaimer. 1255682Smarkm * 1355682Smarkm * 2. Redistributions in binary form must reproduce the above copyright 1455682Smarkm * notice, this list of conditions and the following disclaimer in the 1555682Smarkm * documentation and/or other materials provided with the distribution. 1655682Smarkm * 1755682Smarkm * 3. Neither the name of the Institute nor the names of its contributors 1855682Smarkm * may be used to endorse or promote products derived from this software 1955682Smarkm * without specific prior written permission. 2055682Smarkm * 2155682Smarkm * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 2255682Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2355682Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2455682Smarkm * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 2555682Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2655682Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2755682Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2855682Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2955682Smarkm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3055682Smarkm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3155682Smarkm * SUCH DAMAGE. 3255682Smarkm */ 3355682Smarkm 3455682Smarkm#ifdef HAVE_CONFIG_H 3555682Smarkm#include <config.h> 36178825SdfrRCSID("$Id: unsetenv.c 14773 2005-04-12 11:29:18Z lha $"); 3755682Smarkm#endif 3855682Smarkm 3955682Smarkm#include <stdlib.h> 4055682Smarkm#include <string.h> 4155682Smarkm 4255682Smarkm#include "roken.h" 4355682Smarkm 4455682Smarkmextern char **environ; 4555682Smarkm 4655682Smarkm/* 4755682Smarkm * unsetenv -- 4855682Smarkm */ 49178825Sdfrvoid ROKEN_LIB_FUNCTION 5055682Smarkmunsetenv(const char *name) 5155682Smarkm{ 5255682Smarkm int len; 5355682Smarkm const char *np; 5455682Smarkm char **p; 5555682Smarkm 5655682Smarkm if (name == 0 || environ == 0) 5755682Smarkm return; 5855682Smarkm 5955682Smarkm for (np = name; *np && *np != '='; np++) 6055682Smarkm /* nop */; 6155682Smarkm len = np - name; 6255682Smarkm 6355682Smarkm for (p = environ; *p != 0; p++) 6455682Smarkm if (strncmp(*p, name, len) == 0 && (*p)[len] == '=') 6555682Smarkm break; 6655682Smarkm 6755682Smarkm for (; *p != 0; p++) 6855682Smarkm *p = *(p + 1); 6955682Smarkm} 7055682Smarkm 71