Squashed 'third_party/git/' content from commit cb71568594

git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7

1 files changed, 671 insertions, 0 deletions

diff --git a/compat/winansi.c b/compat/winansi.c
new file mode 100644
index 000000000000..cacd82c833a6
--- /dev/null
+++ b/compat/winansi.c
@@ -0,0 +1,671 @@
+/*
+ * 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"
+#include "win32/lazyload.h"
+
+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
+
+ 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 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
+
+static void warn_if_raster_font(void)
+{
+	DWORD fontFamily = 0;
+	DECLARE_PROC_ADDR(kernel32.dll, BOOL, GetCurrentConsoleFontEx,
+			HANDLE, BOOL, PCONSOLE_FONT_INFOEX);
+
+	/* don't bother if output was ascii only */
+	if (!non_ascii_used)
+		return;
+
+	/* GetCurrentConsoleFontEx is available since Vista */
+	if (INIT_PROC_ADDR(GetCurrentConsoleFontEx)) {
+		CONSOLE_FONT_INFOEX cfi;
+		cfi.cbSize = sizeof(cfi);
+		if (GetCurrentConsoleFontEx(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;
+
+	/* get OS handle of the file descriptor */
+	hcon = (HANDLE) _get_osfhandle(fd);
+	if (hcon == INVALID_HANDLE_VALUE)
+		return 0;
+
+	/* check if its a device (i.e. console, printer, serial port) */
+	if (GetFileType(hcon) != FILE_TYPE_CHAR)
+		return 0;
+
+	/* check if its a handle to a console output screen buffer */
+	if (!fd) {
+		if (!GetConsoleMode(hcon, &mode))
+			return 0;
+		/*
+		 * This code path is only reached if there is no console
+		 * attached to stdout/stderr, i.e. we will not need to output
+		 * any text to any console, therefore we might just as well
+		 * use black as foreground color.
+		 */
+		sbi.wAttributes = 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;
+	}
+
+	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);
+	if (wlen < 0) {
+		wchar_t *err = L"[invalid]";
+		WriteConsoleW(console, err, wcslen(err), &dummy, NULL);
+		return;
+	}
+
+	/* 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)
+
+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 void set_attr(char func, const int *params, int paramlen)
+{
+	int i;
+	switch (func) {
+	case 'm':
+		for (i = 0; i < paramlen; i++) {
+			switch (params[i]) {
+			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;
+			}
+		}
+		set_console_attr();
+		break;
+	case 'K':
+		erase_in_line();
+		break;
+	default:
+		/* Unsupported code */
+		break;
+	}
+}
+
+enum {
+	TEXT = 0, ESCAPE = 033, BRACKET = '['
+};
+
+static DWORD WINAPI console_thread(LPVOID unused)
+{
+	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;
+			}
+		}
+
+		/* 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;
+			}
+
+			/* print remaining complete UTF-8 sequences */
+			if (end > start)
+				write_console(buffer + start, end - start);
+
+			/* move remaining bytes to the front */
+			if (end < bytes)
+				memmove(buffer, buffer + end, bytes - end);
+			end = bytes - end;
+		} else {
+			/* all data has been consumed, mark buffer empty */
+			end = 0;
+		}
+	}
+
+	/* check if the console font supports unicode */
+	warn_if_raster_font();
+
+	CloseHandle(hread);
+	return 0;
+}
+
+static void winansi_exit(void)
+{
+	/* flush all streams */
+	_flushall();
+
+	/* signal console thread to exit */
+	FlushFileBuffers(hwrite);
+	DisconnectNamedPipe(hwrite);
+
+	/* wait for console thread to copy remaining data */
+	WaitForSingleObject(hthread, INFINITE);
+
+	/* cleanup handles... */
+	CloseHandle(hwrite);
+	CloseHandle(hthread);
+}
+
+static void die_lasterr(const char *fmt, ...)
+{
+	va_list params;
+	va_start(params, fmt);
+	errno = err_win_to_posix(GetLastError());
+	die_errno(fmt, params);
+	va_end(params);
+}
+
+#undef dup2
+int winansi_dup2(int oldfd, int newfd)
+{
+	int ret = dup2(oldfd, newfd);
+
+	if (!ret && newfd >= 0 && newfd <= 2)
+		fd_is_interactive[newfd] = oldfd < 0 || oldfd > 2 ?
+			0 : fd_is_interactive[oldfd];
+
+	return ret;
+}
+
+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;
+}
+
+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;
+}
+
+#ifdef DETECT_MSYS_TTY
+
+#include <winternl.h>
+
+#if defined(_MSC_VER)
+
+typedef struct _OBJECT_NAME_INFORMATION
+{
+	UNICODE_STRING Name;
+	WCHAR NameBuffer[0];
+} OBJECT_NAME_INFORMATION, *POBJECT_NAME_INFORMATION;
+
+#define ObjectNameInformation 1
+
+#else
+#include <ntstatus.h>
+#endif
+
+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;
+
+	/* 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;
+
+	if (fd == 2)
+		setvbuf(stderr, NULL, _IONBF, BUFSIZ);
+	fd_is_interactive[fd] |= FD_MSYS;
+}
+
+#endif
+
+/*
+ * 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);
+}
+
+void winansi_init(void)
+{
+	int con1, con2;
+	wchar_t 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;
+	}
+
+	/* create a named pipe to communicate with the console thread */
+	if (swprintf(name, ARRAY_SIZE(name) - 1, L"\\\\.\\pipe\\winansi%lu",
+		     GetCurrentProcessId()) < 0)
+		die("Could not initialize winansi pipe name");
+	hwrite = CreateNamedPipeW(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 = CreateFileW(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));
+}
+
+/*
+ * 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)
+{
+	if (fd == 1 && (fd_is_interactive[1] & FD_SWAPPED))
+		return hconsole1;
+	if (fd == 2 && (fd_is_interactive[2] & FD_SWAPPED))
+		return hconsole2;
+
+	return (HANDLE)_get_osfhandle(fd);
+}