1 #pragma ident "%Z%%M% %I% %E% SMI"
2 /*
3 * Copyright (c) 1987, 1993
4 * The Regents of the University of California. 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 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the University of
17 * California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 /* based on @(#)setenv.c 8.1 (Berkeley) 6/4/93 */
36 /* based on @(#)getenv.c 8.1 (Berkeley) 6/4/93 */
37
38 #ifndef __STDC__
39 #define const
40 #endif
41
42 #include <stddef.h>
43 #include <stdlib.h>
44 #include <string.h>
45
46 #ifndef __P
47 #define __P(x) ()
48 #endif
49 static char *__findenv __P((const char *, int *));
50
51 /*
52 * setenv --
53 * Set the value of the environmental variable "name" to be
54 * "value". If rewrite is set, replace any current value.
55 */
56 int
krb5_setenv(name,value,rewrite)57 krb5_setenv(name, value, rewrite)
58 register const char *name;
59 register const char *value;
60 int rewrite;
61 {
62 #if HAVE_SETENV
63 return (setenv(name, value, rewrite));
64 #else
65 extern char **environ;
66 static int alloced; /* if allocated space before */
67 register char *c;
68 int l_value, offset;
69
70 if (*value == '=') /* no `=' in value */
71 ++value;
72 l_value = strlen(value);
73 if ((c = __findenv(name, &offset))) { /* find if already exists */
74 if (!rewrite)
75 return (0);
76 if (strlen(c) >= l_value) { /* old larger; copy over */
77 while ((*c++ = *value++));
78 return (0);
79 }
80 } else { /* create new slot */
81 register int cnt;
82 register char **p;
83
84 for (p = environ, cnt = 0; *p; ++p, ++cnt);
85 if (alloced) { /* just increase size */
86 environ = (char **)realloc((char *)environ,
87 (size_t)(sizeof(char *) * (cnt + 2)));
88 if (!environ)
89 return (-1);
90 }
91 else { /* get new space */
92 alloced = 1; /* copy old entries into it */
93 p = (char **)malloc((size_t)(sizeof(char *) * (cnt + 2)));
94 if (!p)
95 return (-1);
96 memcpy(p, environ, cnt * sizeof(char *));
97 environ = p;
98 }
99 environ[cnt + 1] = NULL;
100 offset = cnt;
101 }
102 for (c = (char *)name; *c && *c != '='; ++c); /* no `=' in name */
103 if (!(environ[offset] = /* name + `=' + value */
104 malloc((size_t)((int)(c - name) + l_value + 2))))
105 return (-1);
106 /* LINTED */
107 for (c = environ[offset]; (*c = *name++) && (*c != '='); ++c);
108 for (*c++ = '='; (*c++ = *value++););
109 return (0);
110 #endif
111 }
112
113 /*
114 * unsetenv(name) --
115 * Delete environmental variable "name".
116 */
117 void
krb5_unsetenv(name)118 krb5_unsetenv(name)
119 const char *name;
120 {
121 #if HAVE_UNSETENV
122 unsetenv(name);
123 #else
124 extern char **environ;
125 register char **p;
126 int offset;
127
128 while (__findenv(name, &offset)) /* if set multiple times */
129 for (p = &environ[offset];; ++p)
130 /* LINTED */
131 if (!(*p = *(p + 1)))
132 break;
133 #endif
134 }
135
136 /*
137 * getenv --
138 * Returns ptr to value associated with name, if any, else NULL.
139 */
140 char *
krb5_getenv(name)141 krb5_getenv(name)
142 const char *name;
143 {
144 #if HAVE_GETENV
145 return (getenv(name));
146 #else
147 int offset;
148
149 return (__findenv(name, &offset));
150 #endif
151 }
152
153 #if (!HAVE_GETENV || !HAVE_SETENV || !HAVE_UNSETENV)
154 /*
155 * __findenv --
156 * Returns pointer to value associated with name, if any, else NULL.
157 * Sets offset to be the offset of the name/value combination in the
158 * environmental array, for use by setenv(3) and unsetenv(3).
159 * Explicitly removes '=' in argument name.
160 */
161 static char *
__findenv(name,offset)162 __findenv(name, offset)
163 register const char *name;
164 int *offset;
165 {
166 extern char **environ;
167 register int len;
168 register const char *np;
169 register char **p, *c;
170
171 if (name == NULL || environ == NULL)
172 return (NULL);
173 for (np = name; *np && *np != '='; ++np)
174 continue;
175 len = np - name;
176 for (p = environ; (c = *p) != NULL; ++p)
177 if (strncmp(c, name, len) == 0 && c[len] == '=') {
178 *offset = p - environ;
179 return (c + len + 1);
180 }
181 return (NULL);
182 }
183 #endif
184