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