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Sweden-Number/dlls/ntdll/env.c

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/*
* Ntdll environment functions
*
* Copyright 1996, 1998 Alexandre Julliard
* Copyright 2003 Eric Pouech
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <assert.h>
#include "winternl.h"
#include "wine/unicode.h"
#include "wine/debug.h"
#include "ntdll_misc.h"
WINE_DEFAULT_DEBUG_CHANNEL(environ);
/******************************************************************************
* RtlCreateEnvironment [NTDLL.@]
*/
NTSTATUS WINAPI RtlCreateEnvironment(BOOLEAN inherit, PWSTR* env)
{
NTSTATUS nts;
TRACE("(%u,%p)!\n", inherit, env);
if (inherit)
{
MEMORY_BASIC_INFORMATION mbi;
RtlAcquirePebLock();
nts = NtQueryVirtualMemory(NtCurrentProcess(), ntdll_get_process_pmts()->Environment,
0, &mbi, sizeof(mbi), NULL);
if (nts == STATUS_SUCCESS)
{
*env = NULL;
nts = NtAllocateVirtualMemory(NtCurrentProcess(), (void**)env, 0, &mbi.RegionSize,
MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (nts == STATUS_SUCCESS)
memcpy(*env, ntdll_get_process_pmts()->Environment, mbi.RegionSize);
else *env = NULL;
}
RtlReleasePebLock();
}
else
{
ULONG size = 1;
nts = NtAllocateVirtualMemory(NtCurrentProcess(), (void**)env, 0, &size,
MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (nts == STATUS_SUCCESS)
memset(*env, 0, size);
}
return nts;
}
/******************************************************************************
* RtlDestroyEnvironment [NTDLL.@]
*/
NTSTATUS WINAPI RtlDestroyEnvironment(PWSTR env)
{
ULONG size = 0;
TRACE("(%p)!\n", env);
return NtFreeVirtualMemory(NtCurrentProcess(), (void**)&env, &size, MEM_RELEASE);
}
static LPCWSTR ENV_FindVariable(PCWSTR var, PCWSTR name, unsigned namelen)
{
for (; *var; var += strlenW(var) + 1)
{
/* match var names, but avoid setting a var with a name including a '='
* (a starting '=' is valid though)
*/
if (strncmpiW(var, name, namelen) == 0 && var[namelen] == '=' &&
strchrW(var + 1, '=') == var + namelen)
{
return var + namelen + 1;
}
}
return NULL;
}
/******************************************************************
* RtlQueryEnvironmentVariable_U [NTDLL.@]
*
* NOTES: when the buffer is too small, the string is not written, but if the
* terminating null char is the only char that cannot be written, then
* all chars (except the null) are written and success is returned
* (behavior of Win2k at least)
*/
NTSTATUS WINAPI RtlQueryEnvironmentVariable_U(PWSTR env,
PUNICODE_STRING name,
PUNICODE_STRING value)
{
NTSTATUS nts = STATUS_VARIABLE_NOT_FOUND;
PCWSTR var;
unsigned namelen;
TRACE("%s %s %p\n", debugstr_w(env), debugstr_w(name->Buffer), value);
value->Length = 0;
namelen = name->Length / sizeof(WCHAR);
if (!namelen) return nts;
if (!env)
{
RtlAcquirePebLock();
var = ntdll_get_process_pmts()->Environment;
}
else var = env;
var = ENV_FindVariable(var, name->Buffer, namelen);
if (var != NULL)
{
value->Length = strlenW(var) * sizeof(WCHAR);
if (value->Length <= value->MaximumLength)
{
memmove(value->Buffer, var, min(value->Length + sizeof(WCHAR), value->MaximumLength));
nts = STATUS_SUCCESS;
}
else nts = STATUS_BUFFER_TOO_SMALL;
}
if (!env) RtlReleasePebLock();
return nts;
}
/******************************************************************
* RtlSetCurrentEnvironment [NTDLL.@]
*
*/
void WINAPI RtlSetCurrentEnvironment(PWSTR new_env, PWSTR* old_env)
{
TRACE("(%p %p)\n", new_env, old_env);
RtlAcquirePebLock();
if (old_env) *old_env = ntdll_get_process_pmts()->Environment;
ntdll_get_process_pmts()->Environment = new_env;
RtlReleasePebLock();
}
/******************************************************************************
* RtlSetEnvironmentVariable [NTDLL.@]
*/
NTSTATUS WINAPI RtlSetEnvironmentVariable(PWSTR* penv, PUNICODE_STRING name,
PUNICODE_STRING value)
{
INT len, old_size;
LPWSTR p, env;
NTSTATUS nts = STATUS_VARIABLE_NOT_FOUND;
MEMORY_BASIC_INFORMATION mbi;
TRACE("(%p,%s,%s): stub!\n", penv, debugstr_w(name->Buffer), debugstr_w(value->Buffer));
if (!name || !name->Buffer || !name->Buffer[0])
return STATUS_INVALID_PARAMETER_1;
/* variable names can't contain a '=' except as a first character */
if (strchrW(name->Buffer + 1, '=')) return STATUS_INVALID_PARAMETER;
if (!penv)
{
RtlAcquirePebLock();
env = ntdll_get_process_pmts()->Environment;
} else env = *penv;
len = name->Length / sizeof(WCHAR);
/* compute current size of environment */
for (p = env; *p; p += strlenW(p) + 1);
old_size = p + 1 - env;
/* Find a place to insert the string */
for (p = env; *p; p += strlenW(p) + 1)
{
if (!strncmpiW(name->Buffer, p, len) && (p[len] == '=')) break;
}
if (!value && !*p) goto done; /* Value to remove doesn't exist */
/* Realloc the buffer */
len = value ? len + value->Length / sizeof(WCHAR) + 2 : 0;
if (*p) len -= strlenW(p) + 1; /* The name already exists */
if (len < 0)
{
LPWSTR next = p + strlenW(p) + 1; /* We know there is a next one */
memmove(next + len, next, (old_size - (next - env)) * sizeof(WCHAR));
}
nts = NtQueryVirtualMemory(NtCurrentProcess(), env, 0,
&mbi, sizeof(mbi), NULL);
if (nts != STATUS_SUCCESS) goto done;
if ((old_size + len) * sizeof(WCHAR) > mbi.RegionSize)
{
LPWSTR new_env;
ULONG new_size = (old_size + len) * sizeof(WCHAR);
new_env = NULL;
nts = NtAllocateVirtualMemory(NtCurrentProcess(), (void**)&new_env, 0,
&new_size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (nts != STATUS_SUCCESS) goto done;
memmove(new_env, env, (p - env) * sizeof(WCHAR));
assert(len > 0);
memmove(new_env + (p - env) + len, p, (old_size - (p - env)) * sizeof(WCHAR));
p = new_env + (p - env);
RtlDestroyEnvironment(env);
if (!penv) ntdll_get_process_pmts()->Environment = new_env;
else *penv = new_env;
env = new_env;
}
else
{
if (len > 0) memmove(p + len, p, (old_size - (p - env)) * sizeof(WCHAR));
}
/* Set the new string */
if (value)
{
static const WCHAR equalW[] = {'=',0};
strcpyW(p, name->Buffer);
strcatW(p, equalW);
strcatW(p, value->Buffer);
}
done:
if (!penv) RtlReleasePebLock();
return nts;
}
/******************************************************************
* RtlExpandEnvironmentStrings_U (NTDLL.@)
*
*/
NTSTATUS WINAPI RtlExpandEnvironmentStrings_U(PWSTR env, const UNICODE_STRING* us_src,
PUNICODE_STRING us_dst, PULONG plen)
{
DWORD len, count, total_size = 1; /* 1 for terminating '\0' */
LPCWSTR src, p, var;
LPWSTR dst;
src = us_src->Buffer;
count = us_dst->MaximumLength / sizeof(WCHAR);
dst = count ? us_dst->Buffer : NULL;
RtlAcquirePebLock();
while (*src)
{
if (*src != '%')
{
if ((p = strchrW( src, '%' ))) len = p - src;
else len = strlenW(src);
var = src;
src += len;
}
else /* we are at the start of a variable */
{
if ((p = strchrW( src + 1, '%' )))
{
len = p - src - 1; /* Length of the variable name */
if ((var = ENV_FindVariable( env, src + 1, len )))
{
src += len + 2; /* Skip the variable name */
len = strlenW(var);
}
else
{
var = src; /* Copy original name instead */
len += 2;
src += len;
}
}
else /* unfinished variable name, ignore it */
{
var = src;
len = strlenW(src); /* Copy whole string */
src += len;
}
}
total_size += len;
if (dst)
{
if (count < len) len = count;
memcpy(dst, var, len * sizeof(WCHAR));
count -= len;
dst += len;
}
}
RtlReleasePebLock();
/* Null-terminate the string */
if (dst && count) *dst = '\0';
us_dst->Length = (dst) ? (dst - us_dst->Buffer) * sizeof(WCHAR): 0;
if (plen) *plen = total_size * sizeof(WCHAR);
return (count) ? STATUS_SUCCESS : STATUS_BUFFER_TOO_SMALL;
}
/***********************************************************************
* build_environment
*
* Build the Win32 environment from the Unix environment
*/
BOOL build_initial_environment(void)
{
extern char **environ;
LPSTR* e, te;
LPWSTR p;
ULONG size;
NTSTATUS nts;
int len;
/* Compute the total size of the Unix environment */
size = sizeof(BYTE);
for (e = environ; *e; e++)
{
if (!memcmp(*e, "PATH=", 5)) continue;
size += strlen(*e) + 1;
}
size *= sizeof(WCHAR);
/* Now allocate the environment */
nts = NtAllocateVirtualMemory(NtCurrentProcess(), (void**)&p, 0, &size,
MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (nts != STATUS_SUCCESS) return FALSE;
ntdll_get_process_pmts()->Environment = p;
/* And fill it with the Unix environment */
for (e = environ; *e; e++)
{
/* skip Unix PATH and store WINEPATH as PATH */
if (!memcmp(*e, "PATH=", 5)) continue;
if (!memcmp(*e, "WINEPATH=", 9 )) te = *e + 4; else te = *e;
len = strlen(te);
RtlMultiByteToUnicodeN(p, len * sizeof(WCHAR), NULL, te, len);
p[len] = 0;
p += len + 1;
}
*p = 0;
return TRUE;
}
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