mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
134 lines
4 KiB
C
134 lines
4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/calls/strace.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/mem/alg.h"
|
|
#include "libc/mem/internal.h"
|
|
#include "libc/mem/mem.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
#define ToUpper(c) ((c) >= 'a' && (c) <= 'z' ? (c) - 'a' + 'A' : (c))
|
|
|
|
static bool once;
|
|
static size_t capacity;
|
|
|
|
static size_t GetEnvironLen(char **env) {
|
|
char **p = env;
|
|
while (*p) ++p;
|
|
return p - env;
|
|
}
|
|
|
|
static void RestoreOriginalEnvironment(char **envp) {
|
|
environ = envp;
|
|
}
|
|
|
|
static void PutEnvImplAtExit(void *p) {
|
|
free(p);
|
|
}
|
|
|
|
static void FreeEnviron(char **env) {
|
|
char **a;
|
|
for (a = env; *a; ++a) {
|
|
free(*a);
|
|
}
|
|
free(env);
|
|
}
|
|
|
|
static void GrowEnviron(void) {
|
|
size_t n, c;
|
|
char **a, **b, **p;
|
|
a = environ;
|
|
n = a ? GetEnvironLen(a) : 0;
|
|
c = MAX(16ul, n) << 1;
|
|
b = calloc(c, sizeof(char *));
|
|
if (a) {
|
|
for (p = b; *a;) {
|
|
*p++ = strdup(*a++);
|
|
}
|
|
}
|
|
__cxa_atexit(FreeEnviron, b, 0);
|
|
environ = b;
|
|
capacity = c;
|
|
}
|
|
|
|
int PutEnvImpl(char *s, bool overwrite) {
|
|
char *p;
|
|
unsigned i, namelen;
|
|
if (!once) {
|
|
__cxa_atexit(RestoreOriginalEnvironment, environ, 0);
|
|
GrowEnviron();
|
|
once = true;
|
|
} else if (!environ) {
|
|
GrowEnviron();
|
|
}
|
|
for (p = s; *p && *p != '='; ++p) {
|
|
if (IsWindows()) {
|
|
*p = ToUpper(*p);
|
|
}
|
|
}
|
|
if (*p != '=') goto Fail;
|
|
namelen = p + 1 - s;
|
|
for (i = 0; environ[i]; ++i) {
|
|
if (!strncmp(environ[i], s, namelen)) {
|
|
if (!overwrite) {
|
|
free(s);
|
|
return 0;
|
|
}
|
|
goto Replace;
|
|
}
|
|
}
|
|
if (i + 1 >= capacity) {
|
|
GrowEnviron();
|
|
}
|
|
environ[i + 1] = 0;
|
|
Replace:
|
|
__cxa_atexit(PutEnvImplAtExit, environ[i], 0);
|
|
environ[i] = s;
|
|
return 0;
|
|
Fail:
|
|
free(s);
|
|
return einval();
|
|
}
|
|
|
|
static void UnsetenvFree(void *p) {
|
|
free(p);
|
|
}
|
|
|
|
/* weakly called by unsetenv() when removing a pointer */
|
|
void __freeenv(void *p) {
|
|
if (once) {
|
|
__cxa_atexit(UnsetenvFree, p, 0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Emplaces environment key=value.
|
|
*
|
|
* @return 0 on success or non-zero on error
|
|
* @see setenv(), getenv()
|
|
*/
|
|
int putenv(char *s) {
|
|
int rc;
|
|
rc = PutEnvImpl(strdup(s), true);
|
|
STRACE("putenv(%#s) → %d", s, rc);
|
|
return rc;
|
|
}
|