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133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/*
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* SETLOCAL.C - setlocal and endlocal internal batch commands.
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*
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* History:
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*
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* 1 Feb 2008 (Christoph von Wittich)
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* started.
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*/
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#include "precomp.h"
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typedef struct _SETLOCAL
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{
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struct _SETLOCAL *Prev;
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BOOL DelayedExpansion;
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LPTSTR Environment;
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} SETLOCAL;
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/* Create a copy of the current environment */
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LPTSTR
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DuplicateEnvironment(VOID)
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{
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LPTSTR Environ = GetEnvironmentStrings();
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LPTSTR End, EnvironCopy;
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if (!Environ) return NULL;
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for (End = Environ; *End; End += _tcslen(End) + 1) ;
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EnvironCopy = cmd_alloc((End + 1 - Environ) * sizeof(TCHAR));
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if (EnvironCopy)
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memcpy(EnvironCopy, Environ, (End + 1 - Environ) * sizeof(TCHAR));
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FreeEnvironmentStrings(Environ);
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return EnvironCopy;
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}
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INT cmd_setlocal(LPTSTR param)
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{
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SETLOCAL *Saved;
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LPTSTR *arg;
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INT argc, i;
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/* SETLOCAL only works inside a batch file */
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if (!bc)
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return 0;
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Saved = cmd_alloc(sizeof(SETLOCAL));
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if (!Saved)
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{
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error_out_of_memory();
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return 1;
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}
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Saved->Prev = bc->setlocal;
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Saved->DelayedExpansion = bDelayedExpansion;
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Saved->Environment = DuplicateEnvironment();
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if (!Saved->Environment)
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{
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error_out_of_memory();
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cmd_free(Saved);
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return 1;
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}
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bc->setlocal = Saved;
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nErrorLevel = 0;
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arg = splitspace(param, &argc);
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for (i = 0; i < argc; i++)
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{
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if (!_tcsicmp(arg[i], _T("enableextensions")))
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/* not implemented, ignore */;
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else if (!_tcsicmp(arg[i], _T("disableextensions")))
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/* not implemented, ignore */;
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else if (!_tcsicmp(arg[i], _T("enabledelayedexpansion")))
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bDelayedExpansion = TRUE;
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else if (!_tcsicmp(arg[i], _T("disabledelayedexpansion")))
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bDelayedExpansion = FALSE;
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else
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{
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error_invalid_parameter_format(arg[i]);
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break;
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}
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}
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freep(arg);
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return nErrorLevel;
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}
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/* endlocal doesn't take any params */
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INT cmd_endlocal(LPTSTR param)
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{
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LPTSTR Environ, Name, Value;
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SETLOCAL *Saved;
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/* Pop a SETLOCAL struct off of this batch file's stack */
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if (!bc || !(Saved = bc->setlocal))
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return 0;
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bc->setlocal = Saved->Prev;
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bDelayedExpansion = Saved->DelayedExpansion;
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/* First, clear out the environment. Since making any changes to the
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* environment invalidates pointers obtained from GetEnvironmentStrings(),
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* we must make a copy of it and get the variable names from that */
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Environ = DuplicateEnvironment();
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if (Environ)
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{
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for (Name = Environ; *Name; Name += _tcslen(Name) + 1)
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{
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if (!(Value = _tcschr(Name + 1, _T('='))))
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continue;
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*Value++ = _T('\0');
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SetEnvironmentVariable(Name, NULL);
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Name = Value;
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}
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cmd_free(Environ);
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}
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/* Now, restore variables from the copy saved by cmd_setlocal */
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for (Name = Saved->Environment; *Name; Name += _tcslen(Name) + 1)
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{
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if (!(Value = _tcschr(Name + 1, _T('='))))
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continue;
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*Value++ = _T('\0');
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SetEnvironmentVariable(Name, Value);
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Name = Value;
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}
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cmd_free(Saved->Environment);
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cmd_free(Saved);
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return 0;
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}
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