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Cygwin: console: improve replacement char algorithm 

Try various Unicode characters which may be used as a replacement
character in case an invalid character has to be printed.

Current list is 0xfffd "REPLACEMENT CHARACTER", 0x25a1 "WHITE SQUARE",
and 0x2592 "MEDIUM SHADE" in that order.

Additionally workaround a problem with some fonts (namely DejaVu
Sans Mono) which are returned wit ha broken fontname with trailing
stray characters.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2018-09-05 23:39:25 +02:00
parent 213d8cac24
commit bf8aabe830
2 changed files with 99 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
winsup/cygwin/autoload.cc
View File

@ -640,6 +640,12 @@ LoadDLLfunc (LsaRegisterLogonProcess, 12, secur32)
LoadDLLfunc (SHGetDesktopFolder, 4, shell32)
LoadDLLfunc (CreateFontW, 56, gdi32)
LoadDLLfunc (DeleteObject, 4, gdi32)
LoadDLLfunc (EnumFontFamiliesExW, 20, gdi32)
LoadDLLfunc (GetGlyphIndicesW, 20, gdi32)
LoadDLLfunc (SelectObject, 8, gdi32)
LoadDLLfunc (CloseClipboard, 0, user32)
LoadDLLfunc (CloseDesktop, 4, user32)
LoadDLLfunc (CloseWindowStation, 4, user32)
@ -651,6 +657,7 @@ LoadDLLfunc (DispatchMessageW, 4, user32)
LoadDLLfunc (EmptyClipboard, 0, user32)
LoadDLLfunc (EnumWindows, 8, user32)
LoadDLLfunc (GetClipboardData, 4, user32)
LoadDLLfunc (GetDC, 4, user32)
LoadDLLfunc (GetForegroundWindow, 0, user32)
LoadDLLfunc (GetKeyboardLayout, 4, user32)
LoadDLLfunc (GetMessageW, 16, user32)

95
winsup/cygwin/fhandler_console.cc
View File

@ -1971,14 +1971,103 @@ bad_escape:
}
}
#define NUM_REPLACEMENT_CHARS 3
static const wchar_t replacement_char[NUM_REPLACEMENT_CHARS] =
{
0xfffd, /* REPLACEMENT CHARACTER */
0x25a1, /* WHITE SQUARE */
0x2592 /* MEDIUM SHADE */
};
/* nFont member is always 0 so we have to use the facename. */
static WCHAR cons_facename[LF_FACESIZE];
static int rp_char_idx;
static HDC cdc;
static int CALLBACK
enum_proc (const LOGFONTW *lf, const TEXTMETRICW *tm,
DWORD FontType, LPARAM lParam)
{
int *done = (int *) lParam;
*done = 1;
return 0;
}
static void
check_font (HANDLE hdl)
{
CONSOLE_FONT_INFOEX cfi;
LOGFONTW lf;
cfi.cbSize = sizeof cfi;
if (!GetCurrentConsoleFontEx (hdl, 0, &cfi))
return;
/* Switched font? */
if (wcscmp (cons_facename, cfi.FaceName) == 0)
return;
if (!cdc && !(cdc = GetDC (GetConsoleWindow ())))
return;
/* Some FaceNames like DejaVu Sans Mono are sometimes returned with stray
trailing chars. Fix it. */
lf.lfCharSet = ANSI_CHARSET;
lf.lfPitchAndFamily = FIXED_PITCH | FF_DONTCARE;
wchar_t *cp = wcpcpy (lf.lfFaceName, cfi.FaceName) - 1;
int done = 0;
do
{
EnumFontFamiliesExW (cdc, &lf, enum_proc, (LPARAM) &done, 0);
if (!done && cp > lf.lfFaceName)
*cp-- = L'\0';
}
while (!done);
/* Yes. Check for the best replacement char. */
HFONT f = CreateFontW (0, 0, 0, 0,
cfi.FontWeight, FALSE, FALSE, FALSE,
ANSI_CHARSET, OUT_DEFAULT_PRECIS,
CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY,
FIXED_PITCH | FF_DONTCARE, lf.lfFaceName);
if (!f)
return;
HFONT old_f = (HFONT) SelectObject(cdc, f);
if (old_f)
{
WORD glyph_idx[NUM_REPLACEMENT_CHARS];
if (GetGlyphIndicesW (cdc, replacement_char,
NUM_REPLACEMENT_CHARS, glyph_idx,
GGI_MARK_NONEXISTING_GLYPHS) != GDI_ERROR)
{
int i;
for (i = 0; i < NUM_REPLACEMENT_CHARS; ++i)
if (glyph_idx[i] != 0xffff)
break;
if (i == NUM_REPLACEMENT_CHARS)
i = 0;
rp_char_idx = i;
/* Note that we copy the original name returned by
GetCurrentConsoleFontEx, even if it was broken.
This allows an early return, rather than to store
the fixed name and then having to enum font families
all over again. */
wcscpy (cons_facename, cfi.FaceName);
}
SelectObject (cdc, old_f);
}
DeleteObject (f);
}
/* This gets called when we found an invalid input character.
Print Unicode REPLACEMENT CHARACTER (UTF 0xfffd). */
Print one of the above Unicode chars as replacement char. */
inline void
fhandler_console::write_replacement_char ()
{
static const wchar_t replacement_char = 0xfffd; /* REPLACEMENT CHARACTER */
check_font (get_output_handle ());
DWORD done;
WriteConsoleW (get_output_handle (), &replacement_char, 1, &done, 0);
WriteConsoleW (get_output_handle (), &replacement_char[rp_char_idx], 1,
&done, 0);
}
const unsigned char *