527 lines
14 KiB
C++
527 lines
14 KiB
C++
/* strfuncs.cc: misc funcs that don't belong anywhere else
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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2005, 2006, 2007, 2008, 2009 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <stdlib.h>
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#include <wchar.h>
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#include <winnls.h>
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#include <ntdll.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "tls_pbuf.h"
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/* The SJIS, JIS and EUCJP conversion in newlib does not use UTF as
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wchar_t character representation. That's unfortunate for us since
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we require UTF for the OS. What we do here is to have our own
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implementation of the base functions for the conversion using
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the MulitByteToWideChar/WideCharToMultiByte functions. */
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/* GBK, CP949, and Big5 conversions are not available so far in newlib. */
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static int
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__db_wctomb (struct _reent *r, char *s, wchar_t wchar, UINT cp)
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{
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if (s == NULL)
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return 0;
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if (wchar < 0x80)
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{
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*s = (char) wchar;
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return 1;
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}
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BOOL def_used = false;
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int ret = WideCharToMultiByte (cp, cp > 50000 ? 0 : WC_NO_BEST_FIT_CHARS,
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&wchar, 1, s, MB_CUR_MAX, NULL, &def_used);
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if (ret > 0 && !def_used)
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return ret;
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r->_errno = EILSEQ;
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return -1;
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}
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extern "C" int
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__sjis_wctomb (struct _reent *r, char *s, wchar_t wchar, const char *charset,
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mbstate_t *state)
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{
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return __db_wctomb (r,s, wchar, 932);
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}
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extern "C" int
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__jis_wctomb (struct _reent *r, char *s, wchar_t wchar, const char *charset,
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mbstate_t *state)
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{
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return __db_wctomb (r,s, wchar, 50220);
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}
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extern "C" int
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__eucjp_wctomb (struct _reent *r, char *s, wchar_t wchar, const char *charset,
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mbstate_t *state)
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{
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return __db_wctomb (r,s, wchar, 51932);
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}
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extern "C" int
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__gbk_wctomb (struct _reent *r, char *s, wchar_t wchar, const char *charset,
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mbstate_t *state)
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{
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return __db_wctomb (r,s, wchar, 936);
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}
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extern "C" int
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__kr_wctomb (struct _reent *r, char *s, wchar_t wchar, const char *charset,
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mbstate_t *state)
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{
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return __db_wctomb (r,s, wchar, 949);
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}
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extern "C" int
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__big5_wctomb (struct _reent *r, char *s, wchar_t wchar, const char *charset,
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mbstate_t *state)
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{
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return __db_wctomb (r,s, wchar, 950);
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}
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static int
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__db_mbtowc (struct _reent *r, wchar_t *pwc, const char *s, size_t n,
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UINT cp, mbstate_t *state)
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{
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wchar_t dummy;
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char buf[2];
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int ret;
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if (pwc == NULL)
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pwc = &dummy;
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if (s == NULL)
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return 0; /* not state-dependent */
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if (n == 0)
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return -2;
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if (state->__count == 0)
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{
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if (*(unsigned char *) s < 0x80)
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{
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*pwc = *(unsigned char *) s;
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return *s ? 1 : 0;
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}
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ret = MultiByteToWideChar (cp, cp > 50000 ? 0 : MB_ERR_INVALID_CHARS,
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s, 2, pwc, 1);
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if (ret)
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return *s ? 2 : 0;
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if (n == 1)
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{
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state->__count = 1;
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state->__value.__wchb[0] = *s;
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return -2;
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}
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else
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{
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/* These Win32 functions are really crappy. Assuming n is 2
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but the first byte is a singlebyte charcode, the function
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does not convert that byte and return 1, rather it just
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returns 0. So, what we do here is to check if the first
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byte returns a valid value... */
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ret = MultiByteToWideChar (cp,
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cp > 50000 ? 0 : MB_ERR_INVALID_CHARS,
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s, 1, pwc, 1);
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if (ret)
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return *s ? 1 : 0;
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}
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r->_errno = EILSEQ;
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return -1;
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}
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if (!*s)
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return -2;
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buf[0] = state->__value.__wchb[0];
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buf[1] = *s;
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ret = MultiByteToWideChar (cp, cp > 50000 ? 0 : MB_ERR_INVALID_CHARS,
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buf, 2, pwc, 1);
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if (!ret)
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{
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r->_errno = EILSEQ;
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return -1;
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}
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return ret;
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}
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extern "C" int
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__sjis_mbtowc (struct _reent *r, wchar_t *pwc, const char *s, size_t n,
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const char *charset, mbstate_t *state)
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{
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return __db_mbtowc (r, pwc, s, n, 932, state);
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}
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extern "C" int
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__jis_mbtowc (struct _reent *r, wchar_t *pwc, const char *s, size_t n,
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const char *charset, mbstate_t *state)
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{
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return __db_mbtowc (r, pwc, s, n, 50220, state);
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}
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extern "C" int
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__eucjp_mbtowc (struct _reent *r, wchar_t *pwc, const char *s, size_t n,
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const char *charset, mbstate_t *state)
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{
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return __db_mbtowc (r, pwc, s, n, 51932, state);
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}
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extern "C" int
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__gbk_mbtowc (struct _reent *r, wchar_t *pwc, const char *s, size_t n,
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const char *charset, mbstate_t *state)
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{
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return __db_mbtowc (r, pwc, s, n, 936, state);
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}
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extern "C" int
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__kr_mbtowc (struct _reent *r, wchar_t *pwc, const char *s, size_t n,
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const char *charset, mbstate_t *state)
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{
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return __db_mbtowc (r, pwc, s, n, 949, state);
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}
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extern "C" int
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__big5_mbtowc (struct _reent *r, wchar_t *pwc, const char *s, size_t n,
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const char *charset, mbstate_t *state)
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{
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return __db_mbtowc (r, pwc, s, n, 950, state);
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}
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/* Convert Windows codepage to a setlocale compatible character set code.
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Called from newlib's setlocale() with the current ANSI codepage, if the
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charset isn't given explicitely in the POSIX compatible locale specifier.
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The function also returns a pointer to the corresponding _mbtowc_r
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function. This is used below in the sys_cp_mbstowcs function which
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is called directly from fhandler_console if the "Alternate Charset" has
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been switched on by an escape sequence. */
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extern "C" mbtowc_p
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__set_charset_from_codepage (UINT cp, char *charset)
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{
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switch (cp)
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{
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case 437:
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case 720:
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case 737:
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case 775:
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case 850:
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case 852:
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case 855:
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case 857:
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case 858:
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case 862:
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case 866:
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case 874:
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case 1125:
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case 1250:
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case 1251:
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case 1252:
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case 1253:
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case 1254:
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case 1255:
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case 1256:
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case 1257:
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case 1258:
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__small_sprintf (charset, "CP%u", cp);
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return __cp_mbtowc;
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case 28591:
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case 28592:
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case 28593:
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case 28594:
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case 28595:
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case 28596:
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case 28597:
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case 28598:
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case 28599:
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case 28603:
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case 28605:
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__small_sprintf (charset, "ISO-8859-%u", cp - 28590);
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return __iso_mbtowc;
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case 932:
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strcpy (charset, "SJIS");
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return __sjis_mbtowc;
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case 936:
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strcpy (charset, "GBK");
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return __gbk_mbtowc;
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case 949:
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strcpy (charset, "CP949");
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return __kr_mbtowc;
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case 950:
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strcpy (charset, "BIG5");
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return __big5_mbtowc;
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case 50220:
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strcpy (charset, "JIS");
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return __jis_mbtowc;
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case 51932:
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strcpy (charset, "EUCJP");
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return __eucjp_mbtowc;
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case 65001:
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strcpy (charset, "UTF-8");
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return __utf8_mbtowc;
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default:
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break;
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}
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strcpy (charset, "ASCII");
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return __ascii_mbtowc;
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}
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/* Our own sys_wcstombs/sys_mbstowcs functions differ from the
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wcstombs/mbstowcs API in three ways:
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- The UNICODE private use area is used in filenames to specify
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characters not allowed in Windows filenames ('*', '?', etc).
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The sys_wcstombs converts characters in the private use area
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back to the corresponding ASCII chars.
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- If a wide character in a filename has no representation in the current
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multibyte charset, then usually you wouldn't be able to access the
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file. To fix this problem, sys_wcstombs creates a replacement multibyte
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sequences for the non-representable wide-char. The sequence starts with
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an ASCII SO (0x0e, Ctrl-N), followed by the UTF-8 representation of the
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character. The sys_(cp_)mbstowcs function detects ASCII SO characters
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in the input multibyte string and converts the following multibyte
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sequence in by treating it as an UTF-8 char. If that fails, the ASCII
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SO was probably standalone and it gets just copied over as ASCII SO.
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- The functions always create 0-terminated results, no matter what.
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If the result is truncated due to buffer size, it's a bug in Cygwin
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and the buffer in the calling function should be raised. */
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size_t __stdcall
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sys_wcstombs (char *dst, size_t len, const PWCHAR src, size_t nwc)
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{
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char buf[10];
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char *ptr = dst;
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wchar_t *pwcs = (wchar_t *) src;
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size_t n = 0;
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mbstate_t ps;
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memset (&ps, 0, sizeof ps);
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if (dst == NULL)
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len = (size_t) -1;
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while (n < len && nwc-- > 0)
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{
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wchar_t pw = *pwcs;
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/* Convert UNICODE private use area. Reverse functionality (only for
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path names) is transform_chars in path.cc. */
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if ((pw & 0xff00) == 0xf000)
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pw &= 0xff;
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int bytes = _wctomb_r (_REENT, buf, pw, &ps);
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/* Convert chars invalid in the current codepage to a sequence
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ASCII SO; UTF-8 representation of invalid char.
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Do the same for ASCII SO itself. */
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if ((bytes == -1 || pw == 0x0e) && *__locale_charset () != 'U'/*TF-8*/)
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{
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buf[0] = 0x0e; /* ASCII SO */
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bytes = __utf8_wctomb (_REENT, buf + 1, pw, __locale_charset (), &ps);
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if (bytes == -1)
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{
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++pwcs;
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ps.__count = 0;
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continue;
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}
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++bytes; /* Add the ASCII SO to the byte count. */
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if (ps.__count == -4) /* First half of a surrogate pair. */
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{
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++pwcs;
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if ((*pwcs & 0xfc00) != 0xdc00) /* Invalid second half. */
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{
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++pwcs;
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ps.__count = 0;
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continue;
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}
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bytes += __utf8_wctomb (_REENT, buf + bytes, *pwcs,
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__locale_charset (), &ps);
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}
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}
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if (n + bytes <= len)
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{
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n += bytes;
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if (dst)
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{
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for (int i = 0; i < bytes; ++i)
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*ptr++ = buf[i];
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}
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if (*pwcs++ == 0x00)
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break;
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}
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else
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break;
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}
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if (n && dst)
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{
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n = (n < len) ? n : len - 1;
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dst[n] = '\0';
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}
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return n;
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}
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/* Allocate a buffer big enough for the string, always including the
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terminating '\0'. The buffer pointer is returned in *dst_p, the return
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value is the number of bytes written to the buffer, as usual.
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The "type" argument determines where the resulting buffer is stored.
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It's either one of the cygheap_types values, or it's "HEAP_NOTHEAP".
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In the latter case the allocation uses simple calloc.
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Note that this code is shared by cygserver (which requires it via
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__small_vsprintf) and so when built there plain calloc is the
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only choice. */
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size_t __stdcall
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sys_wcstombs_alloc (char **dst_p, int type, const PWCHAR src, size_t nwc)
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{
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size_t ret;
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ret = sys_wcstombs (NULL, (size_t) -1, src, nwc);
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if (ret > 0)
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{
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size_t dlen = ret + 1;
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if (type == HEAP_NOTHEAP)
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*dst_p = (char *) calloc (dlen, sizeof (char));
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else
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*dst_p = (char *) ccalloc ((cygheap_types) type, dlen, sizeof (char));
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if (!*dst_p)
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return 0;
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ret = sys_wcstombs (*dst_p, dlen, src, nwc);
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}
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return ret;
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}
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/* sys_cp_mbstowcs is actually most of the time called as sys_mbstowcs with
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a 0 codepage. If cp is not 0, the codepage is evaluated and used for the
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conversion. This is so that fhandler_console can switch to an alternate
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charset, which is the charset returned by GetConsoleCP (). Most of the
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time this is used for box and line drawing characters. */
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size_t __stdcall
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sys_cp_mbstowcs (UINT cp, PWCHAR dst, size_t dlen, const char *src, size_t nms)
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{
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wchar_t *ptr = dst;
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char *pmbs = (char *) src;
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size_t count = 0;
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size_t len = dlen;
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int bytes;
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mbstate_t ps;
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char charsetbuf[32];
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char *charset = __locale_charset ();
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mbtowc_p f_mbtowc = __mbtowc;
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if (cp)
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f_mbtowc = __set_charset_from_codepage (cp, charset = charsetbuf);
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memset (&ps, 0, sizeof ps);
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if (dst == NULL)
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len = (size_t)-1;
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while (len > 0)
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{
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/* ASCII SO. Convert following UTF-8 sequence (if not UTF-8 anyway). */
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if (*pmbs == 0x0e && *charset != 'U'/*TF-8*/)
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{
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pmbs++;
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bytes = __utf8_mbtowc (_REENT, ptr, pmbs, nms, charset, &ps);
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if (bytes < 0)
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{
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/* Invalid UTF-8 sequence? Treat the ASCII SO character as
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stand-alone ASCII SO char. */
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bytes = 1;
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if (dst)
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*ptr = 0x0e;
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memset (&ps, 0, sizeof ps);
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break;
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}
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if (bytes == 0)
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break;
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if (ps.__count == 4) /* First half of a surrogate. */
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{
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wchar_t *ptr2 = dst ? ptr + 1 : NULL;
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int bytes2 = __utf8_mbtowc (_REENT, ptr2, pmbs + bytes,
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nms - bytes, charset, &ps);
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if (bytes2 < 0)
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break;
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pmbs += bytes2;
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nms -= bytes2;
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++count;
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ptr = dst ? ptr + 1 : NULL;
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--len;
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}
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}
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else
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bytes = f_mbtowc (_REENT, ptr, pmbs, nms, charset, &ps);
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if (bytes > 0)
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{
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pmbs += bytes;
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nms -= bytes;
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++count;
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ptr = dst ? ptr + 1 : NULL;
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--len;
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}
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else
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{
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if (bytes == 0)
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++count;
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break;
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}
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}
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if (count && dst)
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{
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count = (count < dlen) ? count : dlen - 1;
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dst[count] = L'\0';
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}
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return count;
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}
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/* Same as sys_wcstombs_alloc, just backwards. */
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size_t __stdcall
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sys_mbstowcs_alloc (PWCHAR *dst_p, int type, const char *src, size_t nms)
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{
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size_t ret;
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ret = sys_mbstowcs (NULL, (size_t) -1, src, nms);
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if (ret > 0)
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{
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size_t dlen = ret + 1;
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if (type == HEAP_NOTHEAP)
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*dst_p = (PWCHAR) calloc (dlen, sizeof (WCHAR));
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else
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*dst_p = (PWCHAR) ccalloc ((cygheap_types) type, dlen, sizeof (WCHAR));
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if (!*dst_p)
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return 0;
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ret = sys_mbstowcs (*dst_p, dlen, src, nms);
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}
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return ret;
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}
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static WCHAR hex_wchars[] = L"0123456789abcdef";
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NTSTATUS NTAPI
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RtlInt64ToHexUnicodeString (ULONGLONG value, PUNICODE_STRING dest,
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|
BOOLEAN append)
|
|
{
|
|
USHORT len = append ? dest->Length : 0;
|
|
if (dest->MaximumLength - len < 16 * (int) sizeof (WCHAR))
|
|
return STATUS_BUFFER_OVERFLOW;
|
|
PWCHAR end = (PWCHAR) ((PBYTE) dest->Buffer + len);
|
|
register PWCHAR p = end + 16;
|
|
while (p-- > end)
|
|
{
|
|
*p = hex_wchars[value & 0xf];
|
|
value >>= 4;
|
|
}
|
|
dest->Length += 16 * sizeof (WCHAR);
|
|
return STATUS_SUCCESS;
|
|
}
|