1 /* $NetBSD: unsetenv.c,v 1.1.1.1 2011/04/13 18:15:44 elric Exp $ */ 2 3 /* 4 * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <config.h> 37 38 #include <stdlib.h> 39 #include <string.h> 40 41 #include <krb5/roken.h> 42 43 #if !HAVE_DECL_ENVIRON 44 extern char **environ; 45 #endif 46 47 /* 48 * unsetenv -- 49 */ 50 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL 51 unsetenv(const char *name) 52 { 53 int len; 54 const char *np; 55 char **p; 56 57 if (name == 0 || environ == 0) 58 return; 59 60 for (np = name; *np && *np != '='; np++) 61 /* nop */; 62 len = np - name; 63 64 for (p = environ; *p != 0; p++) 65 if (strncmp(*p, name, len) == 0 && (*p)[len] == '=') 66 break; 67 68 for (; *p != 0; p++) 69 *p = *(p + 1); 70 } 71 72