system.cpp File Reference

#include <process.h>
#include <io.h>
#include <stdlib.h>
#include <errno.h>

Include dependency graph for system.cpp:

Go to the source code of this file.

Functions
int _cdecl	_access_s (const char *filename, int mode)
int _cdecl	_waccess_s (const wchar_t *filename, int mode)
int _cdecl	_taccess_s (const char *filename, int mode)
int _cdecl	_taccess_s (const wchar_t *filename, int mode)
char *__cdecl	_tgetenv (_In_z_ char const *_VarName)
wchar_t *__cdecl	_tgetenv (_In_z_ wchar_t const *_VarName)
intptr_t __cdecl	_tspawnve (int flags, const char *name, const char *const *argv, const char *const *envv)
intptr_t __cdecl	_tspawnve (int flags, const wchar_t *name, const wchar_t *const *argv, const wchar_t *const *envv)
intptr_t __cdecl	_tspawnvpe (int flags, const char *name, const char *const *argv, const char *const *envv)
intptr_t __cdecl	_tspawnvpe (int flags, const wchar_t *name, const wchar_t *const *argv, const wchar_t *const *envv)
template<typename Character >
static int __cdecl	common_system (Character const *const command) throw ()
int __cdecl	system (char const *const command)
int __cdecl	_wsystem (wchar_t const *const command)

Function Documentation

_access_s()

int _cdecl _access_s	(	const char *	filename,
		int	mode
	)

Definition at line 1004 of file file.c.

{
  if (!MSVCRT_CHECK_PMT(filename != NULL)) return *_errno();
  if (!MSVCRT_CHECK_PMT((mode & ~(MSVCRT_R_OK | MSVCRT_W_OK)) == 0)) return *_errno();
 
  if (_access(filename, mode) == -1)
    return *_errno();
  return 0;
}

Referenced by _access(), and _taccess_s().

_taccess_s() [1/2]

int _cdecl _taccess_s	(	const char *	filename,
		int	mode
	)

Definition at line 17 of file system.cpp.

{
    return _access_s(filename, mode);
}

_taccess_s() [2/2]

int _cdecl _taccess_s	(	const wchar_t *	filename,
		int	mode
	)

Definition at line 22 of file system.cpp.

{
    return _waccess_s(filename, mode);
}

_tgetenv() [1/2]

char *__cdecl _tgetenv

(

_In_z_ char const *

_VarName

)

Definition at line 27 of file system.cpp.

{
    return getenv(_VarName);
}

_tgetenv() [2/2]

wchar_t *__cdecl _tgetenv

(

_In_z_ wchar_t const *

_VarName

)

Definition at line 32 of file system.cpp.

{
    return _wgetenv(_VarName);
}

_tspawnve() [1/2]

intptr_t __cdecl _tspawnve	(	int	flags,
		const char *	name,
		const char *const *	argv,
		const char *const *	envv
	)

Definition at line 37 of file system.cpp.

{
    return _spawnve(flags, name, argv, envv);
}

_tspawnve() [2/2]

intptr_t __cdecl _tspawnve	(	int	flags,
		const wchar_t *	name,
		const wchar_t *const *	argv,
		const wchar_t *const *	envv
	)

Definition at line 43 of file system.cpp.

{
    return _wspawnve(flags, name, argv, envv);
}

_tspawnvpe() [1/2]

intptr_t __cdecl _tspawnvpe	(	int	flags,
		const char *	name,
		const char *const *	argv,
		const char *const *	envv
	)

Definition at line 49 of file system.cpp.

{
    return _spawnvpe(flags, name, argv, envv);
}

_tspawnvpe() [2/2]

intptr_t __cdecl _tspawnvpe	(	int	flags,
		const wchar_t *	name,
		const wchar_t *const *	argv,
		const wchar_t *const *	envv
	)

Definition at line 55 of file system.cpp.

{
    return _wspawnvpe(flags, name, argv, envv);
}

_waccess_s()

int _cdecl _waccess_s	(	const wchar_t *	filename,
		int	mode
	)

Definition at line 1039 of file file.c.

{
  if (!MSVCRT_CHECK_PMT(filename != NULL)) return *_errno();
  if (!MSVCRT_CHECK_PMT((mode & ~(MSVCRT_R_OK | MSVCRT_W_OK)) == 0)) return *_errno();
 
  if (_waccess(filename, mode) == -1)
    return *_errno();
  return 0;
}

Referenced by _access_s(), _taccess_s(), and _waccess().

_wsystem()

int __cdecl _wsystem

(

wchar_t const *const

command

)

Definition at line 120 of file system.cpp.

{
    return common_system(command);
}

common_system()

template<typename Character >

static int __cdecl common_system ( Character const *const  command ) throw ( )

static

Definition at line 62 of file system.cpp.

{
    static Character const comspec_name[] = { 'C', 'O', 'M', 'S', 'P', 'E', 'C', '\0' }; // "COMSPEC"
    static Character const cmd_exe[]      = { 'c', 'm', 'd', '.', 'e', 'x', 'e', '\0' }; // "cmd.exe"
    static Character const slash_c[]      = { '/', 'c', '\0' }; // "/c"
 
    Character const * comspec_value = _tgetenv(comspec_name);
 
    // If the command is null, return TRUE only if %COMSPEC% is set and the file
    // to which it points exists.
    if (!command)
    {
        if (!comspec_value)
            return 0;
 
        return _taccess_s(comspec_value, 0) == 0;
    }
 
    Character const* arguments[4] =
    {
        comspec_value,
        slash_c,
        command,
        nullptr
    };
 
    if (comspec_value)
    {
        errno_t const saved_errno = errno;
        errno = 0;
 
        int const result = static_cast<int>(_tspawnve(_P_WAIT, arguments[0], arguments, nullptr));
        if (result != -1)
        {
            errno = saved_errno;
            return result;
        }
 
        if (errno != ENOENT && errno != EACCES)
        {
            return result;
        }
 
        // If the error wasn't one of those two errors, try again with cmd.exe...
        errno = saved_errno;
    }
 
   arguments[0] = cmd_exe;
   return static_cast<int>(_tspawnvpe(_P_WAIT, arguments[0], arguments, nullptr));
 
    return 0;
}

Referenced by _wsystem(), and system().

system()

int __cdecl system

(

char const *const

command

)

Definition at line 115 of file system.cpp.

{
    return common_system(command);
}