1 files changed, 393 insertions, 114 deletions

diff --git a/compat/winansi.c b/compat/winansi.c
index dedce2104e..793420f9d0 100644
--- a/compat/winansi.c
+++ b/compat/winansi.c
@@ -2,15 +2,16 @@
  * Copyright 2008 Peter Harris <git@peter.is-a-geek.org>
  */
 
+#undef NOGDI
 #include "../git-compat-util.h"
+#include <wingdi.h>
+#include <winreg.h>
+#include "win32.h"
 
-/*
- Functions to be wrapped:
-*/
-#undef printf
-#undef fprintf
-#undef fputs
-/* TODO: write */
+static int fd_is_interactive[3] = { 0, 0, 0 };
+#define FD_CONSOLE 0x1
+#define FD_SWAPPED 0x2
+#define FD_MSYS    0x4
 
 /*
  ANSI codes used by git: m, K
@@ -23,29 +24,123 @@ static HANDLE console;
 static WORD plain_attr;
 static WORD attr;
 static int negative;
+static int non_ascii_used = 0;
+static HANDLE hthread, hread, hwrite;
+static HANDLE hconsole1, hconsole2;
+
+#ifdef __MINGW32__
+#if !defined(__MINGW64_VERSION_MAJOR) || __MINGW64_VERSION_MAJOR < 5
+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;
+#endif
+#endif
+
+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;
 
-static void init(void)
+	/* GetCurrentConsoleFontEx is available since Vista */
+	pGetCurrentConsoleFontEx = (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)) {
+		const wchar_t *msg = L"\nWarning: Your console font probably "
+			L"doesn\'t support Unicode. If you experience strange "
+			L"characters in the output, consider switching to a "
+			L"TrueType font such as Consolas!\n";
+		DWORD dummy;
+		WriteConsoleW(console, msg, wcslen(msg), &dummy, NULL);
+	}
+}
+
+static int is_console(int fd)
 {
 	CONSOLE_SCREEN_BUFFER_INFO sbi;
+	DWORD mode;
+	HANDLE hcon;
 
 	static int initialized = 0;
-	if (initialized)
-		return;
 
-	console = GetStdHandle(STD_OUTPUT_HANDLE);
-	if (console == INVALID_HANDLE_VALUE)
-		console = NULL;
+	/* get OS handle of the file descriptor */
+	hcon = (HANDLE) _get_osfhandle(fd);
+	if (hcon == INVALID_HANDLE_VALUE)
+		return 0;
 
-	if (!console)
-		return;
+	/* check if its a device (i.e. console, printer, serial port) */
+	if (GetFileType(hcon) != FILE_TYPE_CHAR)
+		return 0;
 
-	GetConsoleScreenBufferInfo(console, &sbi);
-	attr = plain_attr = sbi.wAttributes;
-	negative = 0;
+	/* check if its a handle to a console output screen buffer */
+	if (!fd) {
+		if (!GetConsoleMode(hcon, &mode))
+			return 0;
+	} else if (!GetConsoleScreenBufferInfo(hcon, &sbi))
+		return 0;
+
+	if (fd >= 0 && fd <= 2)
+		fd_is_interactive[fd] |= FD_CONSOLE;
+
+	/* initialize attributes */
+	if (!initialized) {
+		console = hcon;
+		attr = plain_attr = sbi.wAttributes;
+		negative = 0;
+		initialized = 1;
+	}
 
-	initialized = 1;
+	return 1;
 }
 
+#define BUFFER_SIZE 4096
+#define MAX_PARAMS 16
+
+static void write_console(unsigned char *str, size_t len)
+{
+	/* only called from console_thread, so a static buffer will do */
+	static wchar_t wbuf[2 * BUFFER_SIZE + 1];
+	DWORD dummy;
+
+	/* convert utf-8 to utf-16 */
+	int wlen = xutftowcsn(wbuf, (char*) str, ARRAY_SIZE(wbuf), len);
+
+	/* write directly to console */
+	WriteConsoleW(console, wbuf, wlen, &dummy, NULL);
+
+	/* remember if non-ascii characters are printed */
+	if (wlen != len)
+		non_ascii_used = 1;
+}
 
 #define FOREGROUND_ALL (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE)
 #define BACKGROUND_ALL (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE)
@@ -90,18 +185,13 @@ static void erase_in_line(void)
 		&dummy);
 }
 
-
-static const char *set_attr(const char *str)
+static void set_attr(char func, const int *params, int paramlen)
 {
-	const char *func;
-	size_t len = strspn(str, "0123456789;");
-	func = str + len;
-
-	switch (*func) {
+	int i;
+	switch (func) {
 	case 'm':
-		do {
-			long val = strtol(str, (char **)&str, 10);
-			switch (val) {
+		for (i = 0; i < paramlen; i++) {
+			switch (params[i]) {
 			case 0: /* reset */
 				attr = plain_attr;
 				negative = 0;
@@ -224,9 +314,7 @@ static const char *set_attr(const char *str)
 				/* Unsupported code */
 				break;
 			}
-			str++;
-		} while (*(str-1) == ';');
-
+		}
 		set_console_attr();
 		break;
 	case 'K':
@@ -236,122 +324,313 @@ static const char *set_attr(const char *str)
 		/* Unsupported code */
 		break;
 	}
-
-	return func + 1;
 }
 
-static int ansi_emulate(const char *str, FILE *stream)
+enum {
+	TEXT = 0, ESCAPE = 033, BRACKET = '['
+};
+
+static DWORD WINAPI console_thread(LPVOID unused)
 {
-	int rv = 0;
-	const char *pos = str;
-
-	while (*pos) {
-		pos = strstr(str, "\033[");
-		if (pos) {
-			size_t len = pos - str;
-
-			if (len) {
-				size_t out_len = fwrite(str, 1, len, stream);
-				rv += out_len;
-				if (out_len < len)
-					return rv;
+	unsigned char buffer[BUFFER_SIZE];
+	DWORD bytes;
+	int start, end = 0, c, parampos = 0, state = TEXT;
+	int params[MAX_PARAMS];
+
+	while (1) {
+		/* read next chunk of bytes from the pipe */
+		if (!ReadFile(hread, buffer + end, BUFFER_SIZE - end, &bytes,
+				NULL)) {
+			/* exit if pipe has been closed or disconnected */
+			if (GetLastError() == ERROR_PIPE_NOT_CONNECTED ||
+					GetLastError() == ERROR_BROKEN_PIPE)
+				break;
+			/* ignore other errors */
+			continue;
+		}
+
+		/* scan the bytes and handle ANSI control codes */
+		bytes += end;
+		start = end = 0;
+		while (end < bytes) {
+			c = buffer[end++];
+			switch (state) {
+			case TEXT:
+				if (c == ESCAPE) {
+					/* print text seen so far */
+					if (end - 1 > start)
+						write_console(buffer + start,
+							end - 1 - start);
+
+					/* then start parsing escape sequence */
+					start = end - 1;
+					memset(params, 0, sizeof(params));
+					parampos = 0;
+					state = ESCAPE;
+				}
+				break;
+
+			case ESCAPE:
+				/* continue if "\033[", otherwise bail out */
+				state = (c == BRACKET) ? BRACKET : TEXT;
+				break;
+
+			case BRACKET:
+				/* parse [0-9;]* into array of parameters */
+				if (c >= '0' && c <= '9') {
+					params[parampos] *= 10;
+					params[parampos] += c - '0';
+				} else if (c == ';') {
+					/*
+					 * next parameter, bail out if out of
+					 * bounds
+					 */
+					parampos++;
+					if (parampos >= MAX_PARAMS)
+						state = TEXT;
+				} else {
+					/*
+					 * end of escape sequence, change
+					 * console attributes
+					 */
+					set_attr(c, params, parampos + 1);
+					start = end;
+					state = TEXT;
+				}
+				break;
 			}
+		}
 
-			str = pos + 2;
-			rv += 2;
+		/* print remaining text unless parsing an escape sequence */
+		if (state == TEXT && end > start) {
+			/* check for incomplete UTF-8 sequences and fix end */
+			if (buffer[end - 1] >= 0x80) {
+				if (buffer[end -1] >= 0xc0)
+					end--;
+				else if (end - 1 > start &&
+						buffer[end - 2] >= 0xe0)
+					end -= 2;
+				else if (end - 2 > start &&
+						buffer[end - 3] >= 0xf0)
+					end -= 3;
+			}
 
-			fflush(stream);
+			/* print remaining complete UTF-8 sequences */
+			if (end > start)
+				write_console(buffer + start, end - start);
 
-			pos = set_attr(str);
-			rv += pos - str;
-			str = pos;
+			/* move remaining bytes to the front */
+			if (end < bytes)
+				memmove(buffer, buffer + end, bytes - end);
+			end = bytes - end;
 		} else {
-			rv += strlen(str);
-			fputs(str, stream);
-			return rv;
+			/* all data has been consumed, mark buffer empty */
+			end = 0;
 		}
 	}
-	return rv;
-}
 
-int winansi_fputs(const char *str, FILE *stream)
-{
-	int rv;
+	/* check if the console font supports unicode */
+	warn_if_raster_font();
 
-	if (!isatty(fileno(stream)))
-		return fputs(str, stream);
+	CloseHandle(hread);
+	return 0;
+}
 
-	init();
+static void winansi_exit(void)
+{
+	/* flush all streams */
+	_flushall();
 
-	if (!console)
-		return fputs(str, stream);
+	/* signal console thread to exit */
+	FlushFileBuffers(hwrite);
+	DisconnectNamedPipe(hwrite);
 
-	rv = ansi_emulate(str, stream);
+	/* wait for console thread to copy remaining data */
+	WaitForSingleObject(hthread, INFINITE);
 
-	if (rv >= 0)
-		return 0;
-	else
-		return EOF;
+	/* cleanup handles... */
+	CloseHandle(hwrite);
+	CloseHandle(hthread);
 }
 
-static int winansi_vfprintf(FILE *stream, const char *format, va_list list)
+static void die_lasterr(const char *fmt, ...)
 {
-	int len, rv;
-	char small_buf[256];
-	char *buf = small_buf;
-	va_list cp;
+	va_list params;
+	va_start(params, fmt);
+	errno = err_win_to_posix(GetLastError());
+	die_errno(fmt, params);
+	va_end(params);
+}
 
-	if (!isatty(fileno(stream)))
-		goto abort;
+static HANDLE duplicate_handle(HANDLE hnd)
+{
+	HANDLE hresult, hproc = GetCurrentProcess();
+	if (!DuplicateHandle(hproc, hnd, hproc, &hresult, 0, TRUE,
+			DUPLICATE_SAME_ACCESS))
+		die_lasterr("DuplicateHandle(%li) failed",
+			(long) (intptr_t) hnd);
+	return hresult;
+}
 
-	init();
+static HANDLE swap_osfhnd(int fd, HANDLE new_handle)
+{
+	/*
+	 * Create a copy of the original handle associated with fd
+	 * because the original will get closed when we dup2().
+	 */
+	HANDLE handle = (HANDLE)_get_osfhandle(fd);
+	HANDLE duplicate = duplicate_handle(handle);
+
+	/* Create a temp fd associated with the already open "new_handle". */
+	int new_fd = _open_osfhandle((intptr_t)new_handle, O_BINARY);
+
+	assert((fd == 1) || (fd == 2));
+
+	/*
+	 * Use stock dup2() to re-bind fd to the new handle.  Note that
+	 * this will implicitly close(1) and close both fd=1 and the
+	 * originally associated handle.  It will open a new fd=1 and
+	 * call DuplicateHandle() on the handle associated with new_fd.
+	 * It is because of this implicit close() that we created the
+	 * copy of the original.
+	 *
+	 * Note that we need to update the cached console handle to the
+	 * duplicated one because the dup2() call will implicitly close
+	 * the original one.
+	 *
+	 * Note that dup2() when given target := {0,1,2} will also
+	 * call SetStdHandle(), so we don't need to worry about that.
+	 */
+	if (console == handle)
+		console = duplicate;
+	dup2(new_fd, fd);
+
+	/* Close the temp fd.  This explicitly closes "new_handle"
+	 * (because it has been associated with it).
+	 */
+	close(new_fd);
+
+	if (fd == 2)
+		setvbuf(stderr, NULL, _IONBF, BUFSIZ);
+	fd_is_interactive[fd] |= FD_SWAPPED;
+
+	return duplicate;
+}
 
-	if (!console)
-		goto abort;
+#ifdef DETECT_MSYS_TTY
 
-	va_copy(cp, list);
-	len = vsnprintf(small_buf, sizeof(small_buf), format, cp);
-	va_end(cp);
+#include <winternl.h>
+#include <ntstatus.h>
 
-	if (len > sizeof(small_buf) - 1) {
-		buf = malloc(len + 1);
-		if (!buf)
-			goto abort;
+static void detect_msys_tty(int fd)
+{
+	ULONG result;
+	BYTE buffer[1024];
+	POBJECT_NAME_INFORMATION nameinfo = (POBJECT_NAME_INFORMATION) buffer;
+	PWSTR name;
+
+	/* check if fd is a pipe */
+	HANDLE h = (HANDLE) _get_osfhandle(fd);
+	if (GetFileType(h) != FILE_TYPE_PIPE)
+		return;
 
-		len = vsnprintf(buf, len + 1, format, list);
-	}
+	/* get pipe name */
+	if (!NT_SUCCESS(NtQueryObject(h, ObjectNameInformation,
+			buffer, sizeof(buffer) - 2, &result)))
+		return;
+	name = nameinfo->Name.Buffer;
+	name[nameinfo->Name.Length / sizeof(*name)] = 0;
+
+	/*
+	 * Check if this could be a MSYS2 pty pipe ('msys-XXXX-ptyN-XX')
+	 * or a cygwin pty pipe ('cygwin-XXXX-ptyN-XX')
+	 */
+	if ((!wcsstr(name, L"msys-") && !wcsstr(name, L"cygwin-")) ||
+			!wcsstr(name, L"-pty"))
+		return;
 
-	rv = ansi_emulate(buf, stream);
+	if (fd == 2)
+		setvbuf(stderr, NULL, _IONBF, BUFSIZ);
+	fd_is_interactive[fd] |= FD_MSYS;
+}
 
-	if (buf != small_buf)
-		free(buf);
-	return rv;
+#endif
 
-abort:
-	rv = vfprintf(stream, format, list);
-	return rv;
+/*
+ * Wrapper for isatty().  Most calls in the main git code
+ * call isatty(1 or 2) to see if the instance is interactive
+ * and should: be colored, show progress, paginate output.
+ * We lie and give results for what the descriptor WAS at
+ * startup (and ignore any pipe redirection we internally
+ * do).
+ */
+#undef isatty
+int winansi_isatty(int fd)
+{
+	if (fd >= 0 && fd <= 2)
+		return fd_is_interactive[fd] != 0;
+	return isatty(fd);
 }
 
-int winansi_fprintf(FILE *stream, const char *format, ...)
+void winansi_init(void)
 {
-	va_list list;
-	int rv;
-
-	va_start(list, format);
-	rv = winansi_vfprintf(stream, format, list);
-	va_end(list);
+	int con1, con2;
+	char name[32];
+
+	/* check if either stdout or stderr is a console output screen buffer */
+	con1 = is_console(1);
+	con2 = is_console(2);
+
+	/* Also compute console bit for fd 0 even though we don't need the result here. */
+	is_console(0);
+
+	if (!con1 && !con2) {
+#ifdef DETECT_MSYS_TTY
+		/* check if stdin / stdout / stderr are MSYS2 pty pipes */
+		detect_msys_tty(0);
+		detect_msys_tty(1);
+		detect_msys_tty(2);
+#endif
+		return;
+	}
 
-	return rv;
+	/* create a named pipe to communicate with the console thread */
+	xsnprintf(name, sizeof(name), "\\\\.\\pipe\\winansi%lu", GetCurrentProcessId());
+	hwrite = CreateNamedPipe(name, PIPE_ACCESS_OUTBOUND,
+		PIPE_TYPE_BYTE | PIPE_WAIT, 1, BUFFER_SIZE, 0, 0, NULL);
+	if (hwrite == INVALID_HANDLE_VALUE)
+		die_lasterr("CreateNamedPipe failed");
+
+	hread = CreateFile(name, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
+	if (hread == INVALID_HANDLE_VALUE)
+		die_lasterr("CreateFile for named pipe failed");
+
+	/* start console spool thread on the pipe's read end */
+	hthread = CreateThread(NULL, 0, console_thread, NULL, 0, NULL);
+	if (hthread == INVALID_HANDLE_VALUE)
+		die_lasterr("CreateThread(console_thread) failed");
+
+	/* schedule cleanup routine */
+	if (atexit(winansi_exit))
+		die_errno("atexit(winansi_exit) failed");
+
+	/* redirect stdout / stderr to the pipe */
+	if (con1)
+		hconsole1 = swap_osfhnd(1, duplicate_handle(hwrite));
+	if (con2)
+		hconsole2 = swap_osfhnd(2, duplicate_handle(hwrite));
 }
 
-int winansi_printf(const char *format, ...)
+/*
+ * Returns the real console handle if stdout / stderr is a pipe redirecting
+ * to the console. Allows spawn / exec to pass the console to the next process.
+ */
+HANDLE winansi_get_osfhandle(int fd)
 {
-	va_list list;
-	int rv;
-
-	va_start(list, format);
-	rv = winansi_vfprintf(stdout, format, list);
-	va_end(list);
+	if (fd == 1 && (fd_is_interactive[1] & FD_SWAPPED))
+		return hconsole1;
+	if (fd == 2 && (fd_is_interactive[2] & FD_SWAPPED))
+		return hconsole2;
 
-	return rv;
+	return (HANDLE)_get_osfhandle(fd);
 }