1/* $NetBSD: putenv.c,v 1.2 2017/01/28 21:31:50 christos Exp $ */ 2 3/* 4 * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska H��gskolan 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 40#if !HAVE_DECL_ENVIRON 41extern char **environ; 42#endif 43 44/* 45 * putenv -- 46 * String points to a string of the form name=value. 47 * 48 * Makes the value of the environment variable name equal to 49 * value by altering an existing variable or creating a new one. 50 */ 51 52ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL 53putenv(const char *string) 54{ 55 int i; 56 const char *eq = (const char *)strchr(string, '='); 57 int len; 58 59 if (eq == NULL) 60 return 1; 61 len = eq - string; 62 63 if(environ == NULL) { 64 environ = malloc(sizeof(char*)); 65 if(environ == NULL) 66 return 1; 67 environ[0] = NULL; 68 } 69 70 for(i = 0; environ[i] != NULL; i++) 71 if(strncmp(string, environ[i], len) == 0) { 72 environ[i] = string; 73 return 0; 74 } 75 environ = realloc(environ, sizeof(char*) * (i + 2)); 76 if(environ == NULL) 77 return 1; 78 environ[i] = string; 79 environ[i+1] = NULL; 80 return 0; 81} 82