1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/*
* putenv.c -- (un)set an envariable
*
* $Id: putenv.c,v 1.3 2006/01/02 03:17:42 bress Exp $
*
* This code is Copyright (c) 2002, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include <h/mh.h>
#include <h/utils.h>
extern char **environ;
/*
* prototypes
*/
int m_putenv (char *, char *);
int unputenv (char *);
static int nvmatch (char *, char *);
int
m_putenv (char *name, char *value)
{
register int i;
register char **ep, **nep, *cp;
cp = mh_xmalloc ((size_t) (strlen (name) + strlen (value) + 2));
sprintf (cp, "%s=%s", name, value);
for (ep = environ, i = 0; *ep; ep++, i++)
if (nvmatch (name, *ep)) {
*ep = cp;
return 0;
}
nep = (char **) mh_xmalloc ((size_t) ((i + 2) * sizeof(*nep)));
for (ep = environ, i = 0; *ep; nep[i++] = *ep++)
continue;
nep[i++] = cp;
nep[i] = NULL;
environ = nep;
return 0;
}
int
unputenv (char *name)
{
char **ep, **nep;
for (ep = environ; *ep; ep++)
if (nvmatch (name, *ep))
break;
if (*ep == NULL)
return 1;
for (nep = ep + 1; *nep; nep++)
continue;
*ep = *--nep;
*nep = NULL;
return 0;
}
static int
nvmatch (char *s1, char *s2)
{
while (*s1 == *s2++)
if (*s1++ == '=')
return 1;
return (*s1 == '\0' && *--s2 == '=');
}
|
