1 /* 2 * Copyright (C) 2001 Alan Robertson <alanr@unix.sh> 3 * This software licensed under the GNU LGPL. 4 * 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 19 * 20 */ 21 22 #include <crm_internal.h> 23 #include <sys/types.h> 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <string.h> 27 28 #define __environ environ 29 #ifndef HAVE_ENVIRON_DECL 30 extern char **environ; 31 #endif 32 33 int 34 unsetenv(const char *name) /* */ 35 { 36 const size_t len = strlen(name); 37 char **ep; 38 39 for (ep = __environ; *ep; ++ep) { 40 if (!strncmp(*ep, name, len) && (*ep)[len] == '=') { 41 /* Found it. */ 42 /* Remove this pointer by moving later ones back. */ 43 char **dp = ep; 44 45 do 46 dp[0] = dp[1]; 47 while (*dp++); 48 /* Continue the loop in case NAME appears again. */ 49 } 50 } 51 return 0; 52 }