1 /* 2 * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <config.h> 35 36 #include <stdlib.h> 37 38 #if !HAVE_DECL_ENVIRON 39 extern char **environ; 40 #endif 41 42 /* 43 * putenv -- 44 * String points to a string of the form name=value. 45 * 46 * Makes the value of the environment variable name equal to 47 * value by altering an existing variable or creating a new one. 48 */ 49 50 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL 51 putenv(const char *string) 52 { 53 int i; 54 const char *eq = (const char *)strchr(string, '='); 55 int len; 56 57 if (eq == NULL) 58 return 1; 59 len = eq - string; 60 61 if(environ == NULL) { 62 environ = malloc(sizeof(char*)); 63 if(environ == NULL) 64 return 1; 65 environ[0] = NULL; 66 } 67 68 for(i = 0; environ[i] != NULL; i++) 69 if(strncmp(string, environ[i], len) == 0) { 70 environ[i] = string; 71 return 0; 72 } 73 environ = realloc(environ, sizeof(char*) * (i + 2)); 74 if(environ == NULL) 75 return 1; 76 environ[i] = string; 77 environ[i+1] = NULL; 78 return 0; 79 } 80