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
| | #include <stdlib.h>
#include <string.h>
#include "libc.h"
char *__strchrnul(const char *, int);
int __unsetenv(const char *, size_t, char **);
static void dummy(char *p, char *r) {}
weak_alias(dummy, __env_change);
int __putenv(char *s, size_t l, char *r)
{
size_t i=0;
if (__environ)
for (; __environ[i]; i++)
if (!strncmp(__environ[i], s, l+1)) {
char *tmp = __environ[i];
__environ[i] = s;
__env_change(tmp, r);
return __unsetenv(s, l, __environ+i+1);
}
static char **oldenv;
char **newenv;
if (__environ == oldenv) {
newenv = realloc(oldenv, sizeof *newenv * (i+2));
if (!newenv) goto oom;
} else {
newenv = malloc(sizeof *newenv * (i+2));
if (!newenv) goto oom;
if (i) memcpy(newenv, __environ, sizeof *newenv * i);
free(oldenv);
}
newenv[i] = s;
newenv[i+1] = 0;
__environ = oldenv = newenv;
if (r) __env_change(0, r);
return 0;
oom:
free(r);
return -1;
}
int putenv(char *s)
{
size_t l = __strchrnul(s, '=') - s;
if (!l || !s[l]) return unsetenv(s);
return __putenv(s, l, 0);
}
|