290 lines
9.1 KiB
C
290 lines
9.1 KiB
C
/***
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*_open.c - open a stream, with string mode
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*
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* Copyright (c) Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines _openfile() - opens a stream, with string arguments for mode
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <file2.h>
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#include <share.h>
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#include <io.h>
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#include <dbgint.h>
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#include <internal.h>
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#include <tchar.h>
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#include <sys\stat.h>
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#define CMASK 0644 /* rw-r--r-- */
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#define P_CMASK 0666 /* different for Posix */
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/***
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*FILE *_openfile(filename, mode, shflag, stream) - open a file with string
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* mode and file sharing flag.
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*
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*Purpose:
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* parse the string, looking for exactly one of {rwa}, at most one '+',
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* at most one of {tb}, at most one of {cn}, at most one of {SR}, at most
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* one 'T', and at most one 'D'. pass the result on as an int containing
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* flags of what was found. open a file with proper mode if permissions
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* allow. buffer not allocated until first i/o call is issued. intended
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* for use inside library only
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*
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*Entry:
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* char *filename - file to open
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* char *mode - mode to use (see above)
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* int shflag - file sharing flag
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* FILE *stream - stream to use for file
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*
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*Exit:
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* set stream's fields, and causes system file management by system calls
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* returns stream or NULL if fails
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*
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*Exceptions:
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*
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*******************************************************************************/
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FILE * __cdecl __topenfile (
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const _TSCHAR *filename,
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const _TSCHAR *mode,
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int shflag,
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FILE *str
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)
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{
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int modeflag = 0;
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int streamflag = _commode;
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int commodeset = 0;
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int scanset = 0;
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int whileflag;
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int filedes;
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FILE *stream;
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BOOL encodingFlag = FALSE;
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_ASSERTE(filename != NULL);
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_ASSERTE(mode != NULL);
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_ASSERTE(str != NULL);
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/* Parse the user's specification string as set flags in
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(1) modeflag - system call flags word
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(2) streamflag - stream handle flags word. */
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/* Skip leading spaces */
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while (*mode == _T(' '))
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{
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++mode;
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}
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/* First mode character must be 'r', 'w', or 'a'. */
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switch (*mode) {
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case _T('r'):
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modeflag = _O_RDONLY;
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streamflag |= _IOREAD;
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break;
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case _T('w'):
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modeflag = _O_WRONLY | _O_CREAT | _O_TRUNC;
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streamflag |= _IOWRT;
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break;
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case _T('a'):
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modeflag = _O_WRONLY | _O_CREAT | _O_APPEND;
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streamflag |= _IOWRT;
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break;
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default:
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_VALIDATE_RETURN(("Invalid file open mode",0), EINVAL, NULL);
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}
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/* There can be up to three more optional mode characters:
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(1) A single '+' character,
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(2) One of 't' and 'b' and
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(3) One of 'c' and 'n'.
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*/
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whileflag=1;
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while(*++mode && whileflag)
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switch(*mode) {
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case _T(' '):
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/* skip spaces */
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break;
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case _T('+'):
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if (modeflag & _O_RDWR)
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whileflag=0;
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else {
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modeflag |= _O_RDWR;
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modeflag &= ~(_O_RDONLY | _O_WRONLY);
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streamflag |= _IORW;
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streamflag &= ~(_IOREAD | _IOWRT);
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}
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break;
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case _T('b'):
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if (modeflag & (_O_TEXT | _O_BINARY))
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whileflag=0;
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else
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modeflag |= _O_BINARY;
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break;
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case _T('t'):
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if (modeflag & (_O_TEXT | _O_BINARY))
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whileflag=0;
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else
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modeflag |= _O_TEXT;
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break;
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case _T('c'):
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if (commodeset)
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whileflag=0;
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else {
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commodeset = 1;
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streamflag |= _IOCOMMIT;
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}
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break;
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case _T('n'):
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if (commodeset)
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whileflag=0;
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else {
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commodeset = 1;
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streamflag &= ~_IOCOMMIT;
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}
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break;
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case _T('S'):
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if (scanset)
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whileflag=0;
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else {
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scanset = 1;
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modeflag |= _O_SEQUENTIAL;
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}
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break;
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case _T('R'):
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if (scanset)
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whileflag=0;
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else {
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scanset = 1;
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modeflag |= _O_RANDOM;
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}
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break;
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case _T('T'):
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if (modeflag & _O_SHORT_LIVED)
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whileflag=0;
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else
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modeflag |= _O_SHORT_LIVED;
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break;
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case _T('D'):
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if (modeflag & _O_TEMPORARY)
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whileflag=0;
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else
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modeflag |= _O_TEMPORARY;
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break;
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case _T('N'):
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modeflag |= _O_NOINHERIT;
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break;
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case _T(','):
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encodingFlag = TRUE;
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whileflag = 0;
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break;
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default:
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_VALIDATE_RETURN(("Invalid file open mode",0), EINVAL, NULL);
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}
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if (encodingFlag)
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{
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static const _TSCHAR ccsField[] = _T("ccs");
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static const _TSCHAR utf8encoding[] = _T("UTF-8");
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static const _TSCHAR utf16encoding[] = _T("UTF-16LE");
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static const _TSCHAR unicodeencoding[] = _T("UNICODE");
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/* Skip spaces */
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while (*mode == _T(' '))
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{
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++mode;
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}
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/*
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* The length that we want to compare is numbers of elements in
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* csField -1 since this number also contains NULL terminator
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*/
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if (_tcsncmp(ccsField, mode, (_countof(ccsField))-1) != 0)
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_VALIDATE_RETURN(("Invalid file open mode",0), EINVAL, NULL);
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mode += _countof(ccsField)-1;
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/* Skip spaces */
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while (*mode == _T(' '))
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{
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++mode;
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}
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/* Look for '=' */
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if (*mode != _T('='))
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{
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_VALIDATE_RETURN(("Invalid file open mode",0), EINVAL, NULL);
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}
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++mode;
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/* Skip spaces */
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while (*mode == _T(' '))
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{
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++mode;
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}
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if (_tcsnicmp(mode, utf8encoding, _countof(utf8encoding) - 1) == 0){
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mode += _countof(utf8encoding)-1;
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modeflag |= _O_U8TEXT;
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}
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else if (_tcsnicmp(mode, utf16encoding, _countof(utf16encoding) - 1) == 0) {
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mode += _countof(utf16encoding)-1;
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modeflag |= _O_U16TEXT;
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}
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else if (_tcsnicmp(mode, unicodeencoding, _countof(unicodeencoding) - 1) == 0) {
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mode += _countof(unicodeencoding)-1;
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modeflag |= _O_WTEXT;
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}
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else
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_VALIDATE_RETURN(("Invalid file open mode",0), EINVAL, NULL);
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}
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/* Skip trailing spaces */
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while (*mode == _T(' '))
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{
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++mode;
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}
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_VALIDATE_RETURN( (*mode == _T('\0')), EINVAL, NULL);
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/* Try to open the file. Note that if neither 't' nor 'b' is
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specified, _sopen will use the default. */
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if (_tsopen_s(&filedes, filename, modeflag, shflag, _S_IREAD | _S_IWRITE) != 0)
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return(NULL);
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/* Set up the stream data base. */
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#ifndef CRTDLL
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_cflush++; /* force library pre-termination procedure */
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#endif /* CRTDLL */
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/* Init pointers */
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stream = str;
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stream->_flag = streamflag;
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stream->_cnt = 0;
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stream->_tmpfname = stream->_base = stream->_ptr = NULL;
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stream->_file = filedes;
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return(stream);
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}
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