env.c revision 178825 
1/*
2 * Copyright (c) 2000 Kungliga Tekniska H�gskolan
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 "login_locl.h"
35RCSID("$Id: env.c 8476 2000-06-28 12:27:38Z joda $");
36
37/*
38 * the environment we will send to execle and the shell.
39 */
40
41char **env;
42int num_env;
43
44void
45extend_env(char *str)
46{
47    env = realloc(env, (num_env + 1) * sizeof(*env));
48    if(env == NULL)
49	errx(1, "Out of memory!");
50    env[num_env++] = str;
51}
52
53void
54add_env(const char *var, const char *value)
55{
56    int i;
57    char *str;
58    asprintf(&str, "%s=%s", var, value);
59    if(str == NULL)
60	errx(1, "Out of memory!");
61    for(i = 0; i < num_env; i++)
62	if(strncmp(env[i], var, strlen(var)) == 0 &&
63	   env[i][strlen(var)] == '='){
64	    free(env[i]);
65	    env[i] = str;
66	    return;
67	}
68
69    extend_env(str);
70}
71
72void
73copy_env(void)
74{
75    char **p;
76    for(p = environ; *p; p++)
77	extend_env(*p);
78}
79
80int
81login_read_env(const char *file)
82{
83    char **newenv;
84    char *p;
85    int i, j;
86
87    newenv = NULL;
88    i = read_environment(file, &newenv);
89    for (j = 0; j < i; j++) {
90	p = strchr(newenv[j], '=');
91	*p++ = 0;
92	add_env(newenv[j], p);
93	*--p = '=';
94	free(newenv[j]);
95    }
96    free(newenv);
97    return 0;
98}
99