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git/compat/winansi.c
Karsten Blees b030362703 Warn if the Windows console font doesn't support Unicode 
Unicode console output won't display correctly with default settings
because the default console font ("Terminal") only supports the system's
OEM charset. Unfortunately, this is a user specific setting, so it cannot
be easily fixed by e.g. some registry tricks in the setup program.

This change prints a warning on exit if console output contained non-ascii
characters and the console font is supposedly not a TrueType font (which
usually have decent Unicode support).

Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
2012-05-20 17:45:29 -06:00

430 lines
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/*
* Copyright 2008 Peter Harris <git@peter.is-a-geek.org>
*/
#include "../git-compat-util.h"
#include <malloc.h>
#include <wingdi.h>
#include <winreg.h>
/*
Functions to be wrapped:
*/
#undef printf
#undef fprintf
#undef fputs
#undef vfprintf
/* TODO: write */
/*
ANSI codes used by git: m, K
This file is git-specific. Therefore, this file does not attempt
to implement any codes that are not used by git.
*/
static HANDLE console;
static WORD plain_attr;
static WORD attr;
static int negative;
static FILE *last_stream = NULL;
static int non_ascii_used = 0;
typedef struct _CONSOLE_FONT_INFOEX {
ULONG cbSize;
DWORD nFont;
COORD dwFontSize;
UINT FontFamily;
UINT FontWeight;
WCHAR FaceName[LF_FACESIZE];
} CONSOLE_FONT_INFOEX, *PCONSOLE_FONT_INFOEX;
typedef BOOL (WINAPI *PGETCURRENTCONSOLEFONTEX)(HANDLE, BOOL,
PCONSOLE_FONT_INFOEX);
static void warn_if_raster_font(void)
{
DWORD fontFamily = 0;
PGETCURRENTCONSOLEFONTEX pGetCurrentConsoleFontEx;
/* don't bother if output was ascii only */
if (!non_ascii_used)
return;
/* GetCurrentConsoleFontEx is available since Vista */
pGetCurrentConsoleFontEx = GetProcAddress(GetModuleHandle("kernel32.dll"),
"GetCurrentConsoleFontEx");
if (pGetCurrentConsoleFontEx) {
CONSOLE_FONT_INFOEX cfi;
cfi.cbSize = sizeof(cfi);
if (pGetCurrentConsoleFontEx(console, 0, &cfi))
fontFamily = cfi.FontFamily;
} else {
/* pre-Vista: check default console font in registry */
HKEY hkey;
if (ERROR_SUCCESS == RegOpenKeyExA(HKEY_CURRENT_USER, "Console", 0,
KEY_READ, &hkey)) {
DWORD size = sizeof(fontFamily);
RegQueryValueExA(hkey, "FontFamily", NULL, NULL,
(LPVOID) &fontFamily, &size);
RegCloseKey(hkey);
}
}
if (!(fontFamily & TMPF_TRUETYPE))
warning("Your console font probably doesn\'t support "
"Unicode. If you experience strange characters in the output, "
"consider switching to a TrueType font such as Lucida Console!");
}
static int is_console(FILE *stream)
{
CONSOLE_SCREEN_BUFFER_INFO sbi;
HANDLE hcon;
static int initialized = 0;
/* use cached value if stream hasn't changed */
if (stream == last_stream)
return console != NULL;
last_stream = stream;
console = NULL;
/* get OS handle of the stream */
hcon = (HANDLE) _get_osfhandle(_fileno(stream));
if (hcon == INVALID_HANDLE_VALUE)
return 0;
/* check if its a handle to a console output screen buffer */
if (!GetConsoleScreenBufferInfo(hcon, &sbi))
return 0;
if (!initialized) {
attr = plain_attr = sbi.wAttributes;
negative = 0;
initialized = 1;
/* check console font on exit */
atexit(warn_if_raster_font);
}
console = hcon;
return 1;
}
static int write_console(const char *str, size_t len)
{
/* convert utf-8 to utf-16, write directly to console */
int wlen = MultiByteToWideChar(CP_UTF8, 0, str, len, NULL, 0);
wchar_t *wbuf = (wchar_t *) alloca(wlen * sizeof(wchar_t));
MultiByteToWideChar(CP_UTF8, 0, str, len, wbuf, wlen);
WriteConsoleW(console, wbuf, wlen, NULL, NULL);
/* remember if non-ascii characters are printed */
if (wlen != len)
non_ascii_used = 1;
/* return original (utf-8 encoded) length */
return len;
}
#define FOREGROUND_ALL (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE)
#define BACKGROUND_ALL (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE)
static void set_console_attr(void)
{
WORD attributes = attr;
if (negative) {
attributes &= ~FOREGROUND_ALL;
attributes &= ~BACKGROUND_ALL;
/* This could probably use a bitmask
instead of a series of ifs */
if (attr & FOREGROUND_RED)
attributes |= BACKGROUND_RED;
if (attr & FOREGROUND_GREEN)
attributes |= BACKGROUND_GREEN;
if (attr & FOREGROUND_BLUE)
attributes |= BACKGROUND_BLUE;
if (attr & BACKGROUND_RED)
attributes |= FOREGROUND_RED;
if (attr & BACKGROUND_GREEN)
attributes |= FOREGROUND_GREEN;
if (attr & BACKGROUND_BLUE)
attributes |= FOREGROUND_BLUE;
}
SetConsoleTextAttribute(console, attributes);
}
static void erase_in_line(void)
{
CONSOLE_SCREEN_BUFFER_INFO sbi;
DWORD dummy; /* Needed for Windows 7 (or Vista) regression */
if (!console)
return;
GetConsoleScreenBufferInfo(console, &sbi);
FillConsoleOutputCharacterA(console, ' ',
sbi.dwSize.X - sbi.dwCursorPosition.X, sbi.dwCursorPosition,
&dummy);
}
static const char *set_attr(const char *str)
{
const char *func;
size_t len = strspn(str, "0123456789;");
func = str + len;
switch (*func) {
case 'm':
do {
long val = strtol(str, (char **)&str, 10);
switch (val) {
case 0: /* reset */
attr = plain_attr;
negative = 0;
break;
case 1: /* bold */
attr |= FOREGROUND_INTENSITY;
break;
case 2: /* faint */
case 22: /* normal */
attr &= ~FOREGROUND_INTENSITY;
break;
case 3: /* italic */
/* Unsupported */
break;
case 4: /* underline */
case 21: /* double underline */
/* Wikipedia says this flag does nothing */
/* Furthermore, mingw doesn't define this flag
attr |= COMMON_LVB_UNDERSCORE; */
break;
case 24: /* no underline */
/* attr &= ~COMMON_LVB_UNDERSCORE; */
break;
case 5: /* slow blink */
case 6: /* fast blink */
/* We don't have blink, but we do have
background intensity */
attr |= BACKGROUND_INTENSITY;
break;
case 25: /* no blink */
attr &= ~BACKGROUND_INTENSITY;
break;
case 7: /* negative */
negative = 1;
break;
case 27: /* positive */
negative = 0;
break;
case 8: /* conceal */
case 28: /* reveal */
/* Unsupported */
break;
case 30: /* Black */
attr &= ~FOREGROUND_ALL;
break;
case 31: /* Red */
attr &= ~FOREGROUND_ALL;
attr |= FOREGROUND_RED;
break;
case 32: /* Green */
attr &= ~FOREGROUND_ALL;
attr |= FOREGROUND_GREEN;
break;
case 33: /* Yellow */
attr &= ~FOREGROUND_ALL;
attr |= FOREGROUND_RED | FOREGROUND_GREEN;
break;
case 34: /* Blue */
attr &= ~FOREGROUND_ALL;
attr |= FOREGROUND_BLUE;
break;
case 35: /* Magenta */
attr &= ~FOREGROUND_ALL;
attr |= FOREGROUND_RED | FOREGROUND_BLUE;
break;
case 36: /* Cyan */
attr &= ~FOREGROUND_ALL;
attr |= FOREGROUND_GREEN | FOREGROUND_BLUE;
break;
case 37: /* White */
attr |= FOREGROUND_RED |
FOREGROUND_GREEN |
FOREGROUND_BLUE;
break;
case 38: /* Unknown */
break;
case 39: /* reset */
attr &= ~FOREGROUND_ALL;
attr |= (plain_attr & FOREGROUND_ALL);
break;
case 40: /* Black */
attr &= ~BACKGROUND_ALL;
break;
case 41: /* Red */
attr &= ~BACKGROUND_ALL;
attr |= BACKGROUND_RED;
break;
case 42: /* Green */
attr &= ~BACKGROUND_ALL;
attr |= BACKGROUND_GREEN;
break;
case 43: /* Yellow */
attr &= ~BACKGROUND_ALL;
attr |= BACKGROUND_RED | BACKGROUND_GREEN;
break;
case 44: /* Blue */
attr &= ~BACKGROUND_ALL;
attr |= BACKGROUND_BLUE;
break;
case 45: /* Magenta */
attr &= ~BACKGROUND_ALL;
attr |= BACKGROUND_RED | BACKGROUND_BLUE;
break;
case 46: /* Cyan */
attr &= ~BACKGROUND_ALL;
attr |= BACKGROUND_GREEN | BACKGROUND_BLUE;
break;
case 47: /* White */
attr |= BACKGROUND_RED |
BACKGROUND_GREEN |
BACKGROUND_BLUE;
break;
case 48: /* Unknown */
break;
case 49: /* reset */
attr &= ~BACKGROUND_ALL;
attr |= (plain_attr & BACKGROUND_ALL);
break;
default:
/* Unsupported code */
break;
}
str++;
} while (*(str-1) == ';');
set_console_attr();
break;
case 'K':
erase_in_line();
break;
default:
/* Unsupported code */
break;
}
return func + 1;
}
static int ansi_emulate(const char *str, FILE *stream)
{
int rv = 0;
const char *pos = str;
fflush(stream);
while (*pos) {
pos = strstr(str, "\033[");
if (pos) {
size_t len = pos - str;
if (len) {
size_t out_len = write_console(str, len);
rv += out_len;
if (out_len < len)
return rv;
}
str = pos + 2;
rv += 2;
pos = set_attr(str);
rv += pos - str;
str = pos;
} else {
size_t len = strlen(str);
rv += write_console(str, len);
return rv;
}
}
return rv;
}
int winansi_fputs(const char *str, FILE *stream)
{
int rv;
if (!is_console(stream))
return fputs(str, stream);
rv = ansi_emulate(str, stream);
if (rv >= 0)
return 0;
else
return EOF;
}
int winansi_vfprintf(FILE *stream, const char *format, va_list list)
{
int len, rv;
char small_buf[256];
char *buf = small_buf;
va_list cp;
if (!is_console(stream))
goto abort;
va_copy(cp, list);
len = vsnprintf(small_buf, sizeof(small_buf), format, cp);
va_end(cp);
if (len > sizeof(small_buf) - 1) {
buf = malloc(len + 1);
if (!buf)
goto abort;
len = vsnprintf(buf, len + 1, format, list);
}
rv = ansi_emulate(buf, stream);
if (buf != small_buf)
free(buf);
return rv;
abort:
rv = vfprintf(stream, format, list);
return rv;
}
int winansi_fprintf(FILE *stream, const char *format, ...)
{
va_list list;
int rv;
va_start(list, format);
rv = winansi_vfprintf(stream, format, list);
va_end(list);
return rv;
}
int winansi_printf(const char *format, ...)
{
va_list list;
int rv;
va_start(list, format);
rv = winansi_vfprintf(stdout, format, list);
va_end(list);
return rv;
}
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