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456 lines
12 KiB
C
456 lines
12 KiB
C
/*
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* Process environment management
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*
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* Copyright 1996, 1998 Alexandre Julliard
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "winuser.h"
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#include "wine/winestring.h"
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#include "process.h"
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#include "heap.h"
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#include "selectors.h"
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#include "winerror.h"
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/* Format of an environment block:
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* ASCIIZ string 1 (xx=yy format)
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* ...
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* ASCIIZ string n
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* BYTE 0
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* WORD 1
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* ASCIIZ program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
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*
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* Notes:
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* - contrary to Microsoft docs, the environment strings do not appear
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* to be sorted on Win95 (although they are on NT); so we don't bother
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* to sort them either.
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*/
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static const char ENV_program_name[] = "C:\\WINDOWS\\SYSTEM\\KRNL386.EXE";
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/* Maximum length of a Win16 environment string (including NULL) */
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#define MAX_WIN16_LEN 128
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/* Extra bytes to reserve at the end of an environment */
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#define EXTRA_ENV_SIZE (sizeof(BYTE) + sizeof(WORD) + sizeof(ENV_program_name))
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/* Fill the extra bytes with the program name and stuff */
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#define FILL_EXTRA_ENV(p) \
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*(p) = '\0'; \
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PUT_WORD( (p) + 1, 1 ); \
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strcpy( (p) + 3, ENV_program_name );
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/***********************************************************************
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* ENV_FindVariable
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*
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* Find a variable in the environment and return a pointer to the value.
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* Helper function for GetEnvironmentVariable and ExpandEnvironmentStrings.
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*/
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static LPCSTR ENV_FindVariable( LPCSTR env, LPCSTR name, INT len )
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{
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while (*env)
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{
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if (!lstrncmpiA( name, env, len ) && (env[len] == '='))
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return env + len + 1;
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env += strlen(env) + 1;
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}
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return NULL;
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}
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/***********************************************************************
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* ENV_BuildEnvironment
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*
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* Build the environment for the initial process
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*/
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static BOOL ENV_BuildEnvironment( PDB *pdb )
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{
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extern char **environ;
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LPSTR p, *e;
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int size;
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/* Compute the total size of the Unix environment */
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size = EXTRA_ENV_SIZE;
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for (e = environ; *e; e++) size += strlen(*e) + 1;
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/* Now allocate the environment */
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if (!(p = HeapAlloc( SystemHeap, 0, size ))) return FALSE;
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pdb->env_db->environ = p;
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/* And fill it with the Unix environment */
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for (e = environ; *e; e++)
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{
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strcpy( p, *e );
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p += strlen(p) + 1;
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}
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/* Now add the program name */
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FILL_EXTRA_ENV( p );
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return TRUE;
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}
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/***********************************************************************
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* ENV_InheritEnvironment
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*
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* Make a process inherit the environment from its parent or from an
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* explicit environment.
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*/
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BOOL ENV_InheritEnvironment( PDB *pdb, LPCSTR env )
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{
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DWORD size;
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LPCSTR src;
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LPSTR dst;
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/* FIXME: should lock the parent environment */
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if (!env)
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{
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if (!pdb->parent) /* initial process */
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return ENV_BuildEnvironment( pdb );
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env = pdb->parent->env_db->environ;
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}
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/* Compute the environment size */
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src = env;
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size = EXTRA_ENV_SIZE;
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while (*src)
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{
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int len = strlen(src) + 1;
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src += len;
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if ((len > MAX_WIN16_LEN) && (pdb->flags & PDB32_WIN16_PROC))
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len = MAX_WIN16_LEN;
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size += len;
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}
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/* Copy the environment */
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if (!(pdb->env_db->environ = HeapAlloc( pdb->heap, 0,
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size + EXTRA_ENV_SIZE )))
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return FALSE;
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pdb->env_db->env_sel = SELECTOR_AllocBlock( pdb->env_db->environ,
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0x10000, SEGMENT_DATA,
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FALSE, FALSE );
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src = env;
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dst = pdb->env_db->environ;
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while (*src)
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{
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if (pdb->flags & PDB32_WIN16_PROC)
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lstrcpynA( dst, src, MAX_WIN16_LEN );
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else
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strcpy( dst, src );
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src += strlen(src) + 1;
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dst += strlen(dst) + 1;
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}
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FILL_EXTRA_ENV( dst );
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return TRUE;
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}
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/***********************************************************************
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* ENV_FreeEnvironment
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*
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* Free a process environment.
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*/
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void ENV_FreeEnvironment( PDB *pdb )
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{
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if (!pdb->env_db) return;
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if (pdb->env_db->env_sel) SELECTOR_FreeBlock( pdb->env_db->env_sel, 1 );
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DeleteCriticalSection( &pdb->env_db->section );
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HeapFree( pdb->heap, 0, pdb->env_db );
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}
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/***********************************************************************
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* GetCommandLine32A (KERNEL32.289)
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*/
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LPCSTR WINAPI GetCommandLineA(void)
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{
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return PROCESS_Current()->env_db->cmd_line;
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}
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/***********************************************************************
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* GetCommandLine32W (KERNEL32.290)
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*/
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LPCWSTR WINAPI GetCommandLineW(void)
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{
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PDB *pdb = PROCESS_Current();
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EnterCriticalSection( &pdb->env_db->section );
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if (!pdb->env_db->cmd_lineW)
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pdb->env_db->cmd_lineW = HEAP_strdupAtoW( pdb->heap, 0,
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pdb->env_db->cmd_line );
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LeaveCriticalSection( &pdb->env_db->section );
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return pdb->env_db->cmd_lineW;
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}
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/***********************************************************************
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* GetEnvironmentStrings32A (KERNEL32.319) (KERNEL32.320)
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*/
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LPSTR WINAPI GetEnvironmentStringsA(void)
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{
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PDB *pdb = PROCESS_Current();
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return pdb->env_db->environ;
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}
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/***********************************************************************
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* GetEnvironmentStrings32W (KERNEL32.321)
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*/
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LPWSTR WINAPI GetEnvironmentStringsW(void)
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{
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INT size;
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LPWSTR ret;
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PDB *pdb = PROCESS_Current();
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EnterCriticalSection( &pdb->env_db->section );
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size = HeapSize( pdb->heap, 0, pdb->env_db->environ );
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if ((ret = HeapAlloc( pdb->heap, 0, size * sizeof(WCHAR) )) != NULL)
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{
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LPSTR pA = pdb->env_db->environ;
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LPWSTR pW = ret;
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while (size--) *pW++ = (WCHAR)(BYTE)*pA++;
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}
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LeaveCriticalSection( &pdb->env_db->section );
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return ret;
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}
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/***********************************************************************
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* FreeEnvironmentStrings32A (KERNEL32.268)
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*/
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BOOL WINAPI FreeEnvironmentStringsA( LPSTR ptr )
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{
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PDB *pdb = PROCESS_Current();
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if (ptr != pdb->env_db->environ)
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{
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SetLastError( ERROR_INVALID_PARAMETER );
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return FALSE;
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}
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return TRUE;
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}
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/***********************************************************************
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* FreeEnvironmentStrings32W (KERNEL32.269)
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*/
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BOOL WINAPI FreeEnvironmentStringsW( LPWSTR ptr )
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{
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return HeapFree( GetProcessHeap(), 0, ptr );
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}
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/***********************************************************************
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* GetEnvironmentVariable32A (KERNEL32.322)
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*/
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DWORD WINAPI GetEnvironmentVariableA( LPCSTR name, LPSTR value, DWORD size )
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{
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LPCSTR p;
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INT ret = 0;
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PDB *pdb = PROCESS_Current();
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if (!name || !*name)
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{
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SetLastError( ERROR_INVALID_PARAMETER );
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return 0;
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}
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EnterCriticalSection( &pdb->env_db->section );
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if ((p = ENV_FindVariable( pdb->env_db->environ, name, strlen(name) )))
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{
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ret = strlen(p);
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if (size <= ret)
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{
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/* If not enough room, include the terminating null
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* in the returned size and return an empty string */
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ret++;
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if (value) *value = '\0';
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}
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else if (value) strcpy( value, p );
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}
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LeaveCriticalSection( &pdb->env_db->section );
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return ret; /* FIXME: SetLastError */
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}
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/***********************************************************************
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* GetEnvironmentVariable32W (KERNEL32.323)
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*/
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DWORD WINAPI GetEnvironmentVariableW( LPCWSTR nameW, LPWSTR valW, DWORD size)
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{
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LPSTR name = HEAP_strdupWtoA( GetProcessHeap(), 0, nameW );
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LPSTR val = valW ? HeapAlloc( GetProcessHeap(), 0, size ) : NULL;
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DWORD res = GetEnvironmentVariableA( name, val, size );
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HeapFree( GetProcessHeap(), 0, name );
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if (val)
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{
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lstrcpynAtoW( valW, val, size );
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HeapFree( GetProcessHeap(), 0, val );
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}
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return res;
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}
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/***********************************************************************
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* SetEnvironmentVariable32A (KERNEL32.641)
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*/
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BOOL WINAPI SetEnvironmentVariableA( LPCSTR name, LPCSTR value )
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{
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INT old_size, len, res;
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LPSTR p, env, new_env;
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BOOL ret = FALSE;
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PDB *pdb = PROCESS_Current();
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EnterCriticalSection( &pdb->env_db->section );
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env = p = pdb->env_db->environ;
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/* Find a place to insert the string */
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res = -1;
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len = strlen(name);
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while (*p)
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{
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if (!lstrncmpiA( name, p, len ) && (p[len] == '=')) break;
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p += strlen(p) + 1;
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}
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if (!value && !*p) goto done; /* Value to remove doesn't exist */
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/* Realloc the buffer */
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len = value ? strlen(name) + strlen(value) + 2 : 0;
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if (*p) len -= strlen(p) + 1; /* The name already exists */
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old_size = HeapSize( pdb->heap, 0, env );
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if (len < 0)
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{
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LPSTR next = p + strlen(p) + 1; /* We know there is a next one */
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memmove( next + len, next, old_size - (next - env) );
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}
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if (!(new_env = HeapReAlloc( pdb->heap, 0, env, old_size + len )))
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goto done;
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if (pdb->env_db->env_sel)
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SELECTOR_MoveBlock( pdb->env_db->env_sel, new_env );
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p = new_env + (p - env);
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if (len > 0) memmove( p + len, p, old_size - (p - new_env) );
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/* Set the new string */
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if (value)
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{
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strcpy( p, name );
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strcat( p, "=" );
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strcat( p, value );
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}
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pdb->env_db->environ = new_env;
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ret = TRUE;
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done:
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LeaveCriticalSection( &pdb->env_db->section );
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return ret;
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}
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/***********************************************************************
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* SetEnvironmentVariable32W (KERNEL32.642)
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*/
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BOOL WINAPI SetEnvironmentVariableW( LPCWSTR name, LPCWSTR value )
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{
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LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
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LPSTR valueA = HEAP_strdupWtoA( GetProcessHeap(), 0, value );
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BOOL ret = SetEnvironmentVariableA( nameA, valueA );
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HeapFree( GetProcessHeap(), 0, nameA );
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HeapFree( GetProcessHeap(), 0, valueA );
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return ret;
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}
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/***********************************************************************
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* ExpandEnvironmentStrings32A (KERNEL32.216)
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*
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* Note: overlapping buffers are not supported; this is how it should be.
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*/
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DWORD WINAPI ExpandEnvironmentStringsA( LPCSTR src, LPSTR dst, DWORD count )
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{
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DWORD len, total_size = 1; /* 1 for terminating '\0' */
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LPCSTR p, var;
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PDB *pdb = PROCESS_Current();
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if (!count) dst = NULL;
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EnterCriticalSection( &pdb->env_db->section );
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while (*src)
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{
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if (*src != '%')
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{
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if ((p = strchr( src, '%' ))) len = p - src;
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else len = strlen(src);
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var = src;
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src += len;
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}
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else /* we are at the start of a variable */
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{
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if ((p = strchr( src + 1, '%' )))
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{
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len = p - src - 1; /* Length of the variable name */
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if ((var = ENV_FindVariable( pdb->env_db->environ,
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src + 1, len )))
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{
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src += len + 2; /* Skip the variable name */
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len = strlen(var);
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}
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else
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{
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var = src; /* Copy original name instead */
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len += 2;
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src += len;
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}
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}
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else /* unfinished variable name, ignore it */
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{
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var = src;
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len = strlen(src); /* Copy whole string */
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src += len;
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}
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}
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total_size += len;
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if (dst)
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{
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if (count < len) len = count;
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memcpy( dst, var, len );
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dst += len;
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count -= len;
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}
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}
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LeaveCriticalSection( &pdb->env_db->section );
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/* Null-terminate the string */
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if (dst)
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{
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if (!count) dst--;
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*dst = '\0';
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}
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return total_size;
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}
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/***********************************************************************
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* ExpandEnvironmentStrings32W (KERNEL32.217)
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*/
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DWORD WINAPI ExpandEnvironmentStringsW( LPCWSTR src, LPWSTR dst, DWORD len )
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{
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LPSTR srcA = HEAP_strdupWtoA( GetProcessHeap(), 0, src );
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LPSTR dstA = dst ? HeapAlloc( GetProcessHeap(), 0, len ) : NULL;
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DWORD ret = ExpandEnvironmentStringsA( srcA, dstA, len );
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if (dstA)
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{
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lstrcpyAtoW( dst, dstA );
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HeapFree( GetProcessHeap(), 0, dstA );
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}
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HeapFree( GetProcessHeap(), 0, srcA );
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return ret;
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}
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