112 lines
4.3 KiB
C
112 lines
4.3 KiB
C
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/***
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*system.c - pass a command line to the shell
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines system() - passes a command to the shell
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*
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*Revision History:
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* 12-01-83 RN written
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* 10-23-86 SKS Fixed use of strtok(), added check for NULL rtn from getenv
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* 12-18-86 SKS PROTMODE symbol used for dual-modal version
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* 02-23-86 JCR Put in support for NULL command pointer (MSDOS only)
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* 04-13-86 JCR Added const to declaration
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* 06-30-87 JCR Re-wrote system to use spawnvpe, removed XENIX conditional
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* code, lots of general cleaning up.
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* 07-01-87 PHG removed P->PROTMODE compile switch hack
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* 09-22-87 SKS remove extern variable declarations, add ";" to assert()'s
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* 11-10-87 SKS Removed IBMC20 switch, change PROTMODE to OS2
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 02-22-88 JCR Added cast to get rid of cl const warning
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* 09-05-88 SKS Treat EACCES the same as ENOENT -- keep trying
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* 03-08-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include
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* <cruntime.h>, removed some leftover DOS support and
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* fixed the copyright. Also, cleaned up the formatting
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* formatting a bit.
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* 07-23-90 SBM Compiles cleanly with -W3 (removed unreferenced
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* variable), removed redundant includes, replaced
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* <assertm.h> by <assert.h>, minor optimizations
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* 09-27-90 GJF New-style function declarator.
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* 01-17-91 GJF ANSI naming.
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* 02-14-90 SRW Use NULL instead of _environ to get default.
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* 02-23-93 SKS Remove reference to _osmode and use of "command.com"
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 12-07-93 CFW Wide char enable.
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* 12-06-94 SKS Assume command.com for Win95, but cmd.exe for Win. NT.
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* 01-16-95 SKS Avoid calling access(NULL) if command==NULL and
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* %COMSPEC% is unset.
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* 02-06-95 CFW assert -> _ASSERTE.
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* 02-06-98 GJF Changes for Win64: added cast to int where necessary
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <process.h>
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#include <io.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <tchar.h>
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#include <dbgint.h>
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/***
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*int system(command) - send the command line to a shell
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*
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*Purpose:
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* Executes a shell and passes the command line to it.
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* If command is NULL, determine if a command processor exists.
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* The command processor is described by the environment variable
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* COMSPEC. If that environment variable does not exist, try the
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* name "cmd.exe" for Windows NT and "command.com" for Windows '95.
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*
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*Entry:
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* char *command - command to pass to the shell (if NULL, just determine
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* if command processor exists)
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*
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*Exit:
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* if command != NULL returns status of the shell
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* if command == NULL returns non-zero if CP exists, zero if CP doesn't exist
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl _tsystem (
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const _TSCHAR *command
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)
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{
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int catch;
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_TSCHAR *argv[4];
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argv[0] = _tgetenv(_T("COMSPEC"));
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/*
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* If command == NULL, return true IFF %COMSPEC%
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* is set AND the file it points to exists.
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*/
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if (command == NULL) {
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return argv[0] == NULL ? 0 : (!_taccess(argv[0],0));
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}
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_ASSERTE(*command != _T('\0'));
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argv[1] = _T("/c");
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argv[2] = (_TSCHAR *) command;
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argv[3] = NULL;
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/* If there is a COMSPEC defined, try spawning the shell */
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if (argv[0]) /* Do not try to spawn the null string */
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if ((catch = (int)_tspawnve(_P_WAIT,argv[0],argv,NULL)) != -1
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|| (errno != ENOENT && errno != EACCES))
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return(catch);
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/* No COMSPEC so set argv[0] to what COMSPEC should be. */
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argv[0] = ( _osver & 0x8000 ) ? _T("command.com") : _T("cmd.exe");
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/* Let the _spawnvpe routine do the path search and spawn. */
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return((int)_tspawnvpe(_P_WAIT,argv[0],argv,NULL));
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}
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