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Sweden-Number/memory/environ.c

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/*
* Process environment management
*
* Copyright 1996, 1998 Alexandre Julliard
*/
#include <stdlib.h>
#include <string.h>
#include "windef.h"
#include "wingdi.h"
#include "winuser.h"
#include "wine/winestring.h"
#include "process.h"
#include "heap.h"
#include "selectors.h"
#include "winerror.h"
/* Format of an environment block:
* ASCIIZ string 1 (xx=yy format)
* ...
* ASCIIZ string n
* BYTE 0
* WORD 1
* ASCIIZ program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
*
* Notes:
* - contrary to Microsoft docs, the environment strings do not appear
* to be sorted on Win95 (although they are on NT); so we don't bother
* to sort them either.
*/
static const char ENV_program_name[] = "C:\\WINDOWS\\SYSTEM\\KRNL386.EXE";
/* Maximum length of a Win16 environment string (including NULL) */
#define MAX_WIN16_LEN 128
/* Extra bytes to reserve at the end of an environment */
#define EXTRA_ENV_SIZE (sizeof(BYTE) + sizeof(WORD) + sizeof(ENV_program_name))
/* Fill the extra bytes with the program name and stuff */
#define FILL_EXTRA_ENV(p) \
*(p) = '\0'; \
PUT_WORD( (p) + 1, 1 ); \
strcpy( (p) + 3, ENV_program_name );
/***********************************************************************
* ENV_FindVariable
*
* Find a variable in the environment and return a pointer to the value.
* Helper function for GetEnvironmentVariable and ExpandEnvironmentStrings.
*/
static LPCSTR ENV_FindVariable( LPCSTR env, LPCSTR name, INT len )
{
while (*env)
{
if (!lstrncmpiA( name, env, len ) && (env[len] == '='))
return env + len + 1;
env += strlen(env) + 1;
}
return NULL;
}
/***********************************************************************
* ENV_BuildEnvironment
*
* Build the environment for the initial process
*/
BOOL ENV_BuildEnvironment(void)
{
extern char **environ;
LPSTR p, *e;
int size;
/* Compute the total size of the Unix environment */
size = EXTRA_ENV_SIZE;
for (e = environ; *e; e++) size += strlen(*e) + 1;
/* Now allocate the environment */
if (!(p = HeapAlloc( GetProcessHeap(), 0, size ))) return FALSE;
PROCESS_Current()->env_db->environ = p;
PROCESS_Current()->env_db->env_sel = SELECTOR_AllocBlock( p, 0x10000, SEGMENT_DATA,
FALSE, FALSE );
/* And fill it with the Unix environment */
for (e = environ; *e; e++)
{
strcpy( p, *e );
p += strlen(p) + 1;
}
/* Now add the program name */
FILL_EXTRA_ENV( p );
return TRUE;
}
/***********************************************************************
* GetCommandLineA (KERNEL32.289)
*/
LPSTR WINAPI GetCommandLineA(void)
{
return PROCESS_Current()->env_db->cmd_line;
}
/***********************************************************************
* GetCommandLineW (KERNEL32.290)
*/
LPWSTR WINAPI GetCommandLineW(void)
{
PDB *pdb = PROCESS_Current();
EnterCriticalSection( &pdb->env_db->section );
if (!pdb->env_db->cmd_lineW)
pdb->env_db->cmd_lineW = HEAP_strdupAtoW( GetProcessHeap(), 0,
pdb->env_db->cmd_line );
LeaveCriticalSection( &pdb->env_db->section );
return pdb->env_db->cmd_lineW;
}
/***********************************************************************
* GetEnvironmentStringsA (KERNEL32.319) (KERNEL32.320)
*/
LPSTR WINAPI GetEnvironmentStringsA(void)
{
PDB *pdb = PROCESS_Current();
return pdb->env_db->environ;
}
/***********************************************************************
* GetEnvironmentStringsW (KERNEL32.321)
*/
LPWSTR WINAPI GetEnvironmentStringsW(void)
{
INT size;
LPWSTR ret;
PDB *pdb = PROCESS_Current();
EnterCriticalSection( &pdb->env_db->section );
size = HeapSize( GetProcessHeap(), 0, pdb->env_db->environ );
if ((ret = HeapAlloc( GetProcessHeap(), 0, size * sizeof(WCHAR) )) != NULL)
{
LPSTR pA = pdb->env_db->environ;
LPWSTR pW = ret;
while (size--) *pW++ = (WCHAR)(BYTE)*pA++;
}
LeaveCriticalSection( &pdb->env_db->section );
return ret;
}
/***********************************************************************
* FreeEnvironmentStringsA (KERNEL32.268)
*/
BOOL WINAPI FreeEnvironmentStringsA( LPSTR ptr )
{
PDB *pdb = PROCESS_Current();
if (ptr != pdb->env_db->environ)
{
SetLastError( ERROR_INVALID_PARAMETER );
return FALSE;
}
return TRUE;
}
/***********************************************************************
* FreeEnvironmentStringsW (KERNEL32.269)
*/
BOOL WINAPI FreeEnvironmentStringsW( LPWSTR ptr )
{
return HeapFree( GetProcessHeap(), 0, ptr );
}
/***********************************************************************
* GetEnvironmentVariableA (KERNEL32.322)
*/
DWORD WINAPI GetEnvironmentVariableA( LPCSTR name, LPSTR value, DWORD size )
{
LPCSTR p;
INT ret = 0;
PDB *pdb = PROCESS_Current();
if (!name || !*name)
{
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
EnterCriticalSection( &pdb->env_db->section );
if ((p = ENV_FindVariable( pdb->env_db->environ, name, strlen(name) )))
{
ret = strlen(p);
if (size <= ret)
{
/* If not enough room, include the terminating null
* in the returned size and return an empty string */
ret++;
if (value) *value = '\0';
}
else if (value) strcpy( value, p );
}
LeaveCriticalSection( &pdb->env_db->section );
return ret; /* FIXME: SetLastError */
}
/***********************************************************************
* GetEnvironmentVariableW (KERNEL32.323)
*/
DWORD WINAPI GetEnvironmentVariableW( LPCWSTR nameW, LPWSTR valW, DWORD size)
{
LPSTR name = HEAP_strdupWtoA( GetProcessHeap(), 0, nameW );
LPSTR val = valW ? HeapAlloc( GetProcessHeap(), 0, size ) : NULL;
DWORD res = GetEnvironmentVariableA( name, val, size );
HeapFree( GetProcessHeap(), 0, name );
if (val)
{
lstrcpynAtoW( valW, val, size );
HeapFree( GetProcessHeap(), 0, val );
}
return res;
}
/***********************************************************************
* SetEnvironmentVariableA (KERNEL32.641)
*/
BOOL WINAPI SetEnvironmentVariableA( LPCSTR name, LPCSTR value )
{
INT old_size, len, res;
LPSTR p, env, new_env;
BOOL ret = FALSE;
PDB *pdb = PROCESS_Current();
EnterCriticalSection( &pdb->env_db->section );
env = p = pdb->env_db->environ;
/* Find a place to insert the string */
res = -1;
len = strlen(name);
while (*p)
{
if (!lstrncmpiA( name, p, len ) && (p[len] == '=')) break;
p += strlen(p) + 1;
}
if (!value && !*p) goto done; /* Value to remove doesn't exist */
/* Realloc the buffer */
len = value ? strlen(name) + strlen(value) + 2 : 0;
if (*p) len -= strlen(p) + 1; /* The name already exists */
old_size = HeapSize( GetProcessHeap(), 0, env );
if (len < 0)
{
LPSTR next = p + strlen(p) + 1; /* We know there is a next one */
memmove( next + len, next, old_size - (next - env) );
}
if (!(new_env = HeapReAlloc( GetProcessHeap(), 0, env, old_size + len )))
goto done;
if (pdb->env_db->env_sel)
SELECTOR_MoveBlock( pdb->env_db->env_sel, new_env );
p = new_env + (p - env);
if (len > 0) memmove( p + len, p, old_size - (p - new_env) );
/* Set the new string */
if (value)
{
strcpy( p, name );
strcat( p, "=" );
strcat( p, value );
}
pdb->env_db->environ = new_env;
ret = TRUE;
done:
LeaveCriticalSection( &pdb->env_db->section );
return ret;
}
/***********************************************************************
* SetEnvironmentVariableW (KERNEL32.642)
*/
BOOL WINAPI SetEnvironmentVariableW( LPCWSTR name, LPCWSTR value )
{
LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
LPSTR valueA = HEAP_strdupWtoA( GetProcessHeap(), 0, value );
BOOL ret = SetEnvironmentVariableA( nameA, valueA );
HeapFree( GetProcessHeap(), 0, nameA );
HeapFree( GetProcessHeap(), 0, valueA );
return ret;
}
/***********************************************************************
* ExpandEnvironmentStringsA (KERNEL32.216)
*
* Note: overlapping buffers are not supported; this is how it should be.
*/
DWORD WINAPI ExpandEnvironmentStringsA( LPCSTR src, LPSTR dst, DWORD count )
{
DWORD len, total_size = 1; /* 1 for terminating '\0' */
LPCSTR p, var;
PDB *pdb = PROCESS_Current();
if (!count) dst = NULL;
EnterCriticalSection( &pdb->env_db->section );
while (*src)
{
if (*src != '%')
{
if ((p = strchr( src, '%' ))) len = p - src;
else len = strlen(src);
var = src;
src += len;
}
else /* we are at the start of a variable */
{
if ((p = strchr( src + 1, '%' )))
{
len = p - src - 1; /* Length of the variable name */
if ((var = ENV_FindVariable( pdb->env_db->environ,
src + 1, len )))
{
src += len + 2; /* Skip the variable name */
len = strlen(var);
}
else
{
var = src; /* Copy original name instead */
len += 2;
src += len;
}
}
else /* unfinished variable name, ignore it */
{
var = src;
len = strlen(src); /* Copy whole string */
src += len;
}
}
total_size += len;
if (dst)
{
if (count < len) len = count;
memcpy( dst, var, len );
dst += len;
count -= len;
}
}
LeaveCriticalSection( &pdb->env_db->section );
/* Null-terminate the string */
if (dst)
{
if (!count) dst--;
*dst = '\0';
}
return total_size;
}
/***********************************************************************
* ExpandEnvironmentStringsW (KERNEL32.217)
*/
DWORD WINAPI ExpandEnvironmentStringsW( LPCWSTR src, LPWSTR dst, DWORD len )
{
LPSTR srcA = HEAP_strdupWtoA( GetProcessHeap(), 0, src );
LPSTR dstA = dst ? HeapAlloc( GetProcessHeap(), 0, len ) : NULL;
DWORD ret = ExpandEnvironmentStringsA( srcA, dstA, len );
if (dstA)
{
lstrcpyAtoW( dst, dstA );
HeapFree( GetProcessHeap(), 0, dstA );
}
HeapFree( GetProcessHeap(), 0, srcA );
return ret;
}
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