fopen.cpp File Reference

#include <corecrt_internal_stdio.h>

Include dependency graph for fopen.cpp:

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Functions
template<typename Character >
static FILE *__cdecl	common_fsopen (Character const *const file_name, Character const *const mode, int const share_flag) throw ()
template<typename Character >
static errno_t __cdecl	common_fopen_s (FILE **const result, Character const *const file_name, Character const *const mode) throw ()
FILE *__cdecl	_fsopen (char const *const file, char const *const mode, int const share_flag)
FILE *__cdecl	fopen (char const *const file, char const *const mode)
errno_t __cdecl	fopen_s (FILE **const result, char const *const file, char const *const mode)
FILE *__cdecl	_wfsopen (wchar_t const *const file, wchar_t const *const mode, int const share_flag)
FILE *__cdecl	_wfopen (wchar_t const *const file, wchar_t const *const mode)
errno_t __cdecl	_wfopen_s (FILE **const result, wchar_t const *const file, wchar_t const *const mode)

Function Documentation

_fsopen()

FILE *__cdecl _fsopen	(	char const *const	file,
		char const *const	mode,
		int const	share_flag
	)

Definition at line 90 of file fopen.cpp.

{
    return common_fsopen(file, mode, share_flag);
}

_wfopen()

FILE *__cdecl _wfopen	(	wchar_t const *const	file,
		wchar_t const *const	mode
	)

Definition at line 125 of file fopen.cpp.

{
    return common_fsopen(file, mode, _SH_DENYNO);
}

_wfopen_s()

errno_t __cdecl _wfopen_s	(	FILE **const	result,
		wchar_t const *const	file,
		wchar_t const *const	mode
	)

Definition at line 133 of file fopen.cpp.

{
    return common_fopen_s(result, file, mode);
}

_wfsopen()

FILE *__cdecl _wfsopen	(	wchar_t const *const	file,
		wchar_t const *const	mode,
		int const	share_flag
	)

Definition at line 116 of file fopen.cpp.

{
    return common_fsopen(file, mode, share_flag);
}

common_fopen_s()

template<typename Character >

static errno_t __cdecl common_fopen_s ( FILE **const  result, Character const *const  file_name, Character const *const  mode  ) throw ( )

static

Definition at line 73 of file fopen.cpp.

{
    _VALIDATE_RETURN_ERRCODE(result != nullptr, EINVAL);
 
    *result = common_fsopen(file_name, mode, _SH_SECURE);
    if (*result == nullptr)
        return errno;
 
    return 0;
}

Referenced by _wfopen_s(), and fopen_s().

common_fsopen()

template<typename Character >

static FILE *__cdecl common_fsopen ( Character const *const  file_name, Character const *const  mode, int const  share_flag  ) throw ( )

static

Definition at line 22 of file fopen.cpp.

{
    typedef __acrt_stdio_char_traits<Character> stdio_traits;
 
    _VALIDATE_RETURN(file_name != nullptr, EINVAL, nullptr);
    _VALIDATE_RETURN(mode != nullptr,      EINVAL, nullptr);
    _VALIDATE_RETURN(*mode != 0,           EINVAL, nullptr);
 
    // We deliberately don't hard-validate for empty strings here. All other
    // invalid path strings are treated as runtime errors by the inner code
    // in _open and openfile.  This is also the appropriate treatment here.
    // Since fopen is the primary access point for file strings it might be
    // subjected to direct user input and thus must be robust to that rather
    // than aborting. The CRT and OS do not provide any other path validator
    // (because Win32 doesn't allow such things to exist in full generality).
    _VALIDATE_RETURN_NOEXC(*file_name != 0, EINVAL, nullptr);
 
    // Obtain a free stream.  Note that the stream is returned locked:
    __crt_stdio_stream stream = __acrt_stdio_allocate_stream();
    if (!stream.valid())
    {
        errno = EMFILE;
        return nullptr;
    }
 
    FILE* return_value = nullptr;
    __try
    {
        return_value = stdio_traits::open_file(file_name, mode, share_flag, stream.public_stream());
    }
    __finally
    {
        if (return_value == nullptr)
            __acrt_stdio_free_stream(stream);
 
        stream.unlock();
    }
    __endtry
 
    return return_value;
}

Referenced by _fsopen(), _wfopen(), _wfsopen(), common_fopen_s(), and fopen().

fopen()

FILE *__cdecl fopen	(	char const *const	file,
		char const *const	mode
	)

Definition at line 99 of file fopen.cpp.

{
    return common_fsopen(file, mode, _SH_DENYNO);
}

fopen_s()

errno_t __cdecl fopen_s	(	FILE **const	result,
		char const *const	file,
		char const *const	mode
	)

Definition at line 107 of file fopen.cpp.

{
    return common_fopen_s(result, file, mode);
}