xemacs-beta: src/nt.c comparison

comparison src/nt.c @ 209:41ff10fd062f r20-4b3

Import from CVS: tag r20-4b3

author	cvs
date	Mon, 13 Aug 2007 10:04:58 +0200
parents	850242ba4a81
children	78478c60bfcd

comparison

equal deleted inserted replaced

-:f427b8ec4379
+:41ff10fd062f
 Geoff Voelker (voelker@cs.washington.edu) 7-29-94 */
 /* Adapted for XEmacs by David Hobley <david@spook-le0.cia.com.au> */
+/* Sync'ed with Emacs 19.34.6 by Marc Paquette <marcpa@cam.org> */
+#include <stddef.h> /* for offsetof */
+#include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <io.h>
 #include <errno.h>
 #include <fcntl.h>
 #include "nt.h"
 #include <sys/dir.h>
 #include "ntheap.h"
+extern Lisp_Object Vwin32_downcase_file_names;
+extern Lisp_Object Vwin32_generate_fake_inodes;
+extern Lisp_Object Vwin32_get_true_file_attributes;
+static char startup_dir[ MAXPATHLEN ];
 /* Get the current working directory.  */
 char *
 getwd (char *dir)
 {
+#if 0
 if (GetCurrentDirectory (MAXPATHLEN, dir) > 0)
 return dir;
 return NULL;
+#else
+/* Emacs doesn't actually change directory itself, and we want to
+force our real wd to be where emacs.exe is to avoid unnecessary
+conflicts when trying to rename or delete directories.  */
+strcpy (dir, startup_dir);
+return dir;
+#endif
 }
 #ifndef HAVE_SOCKETS
 /* Emulate gethostname.  */
 int
 for (i = 0; i < nelem; i++)
 {
 loadavg[i] = 0.0;
 }
 return i;
-}
-/* Emulate the Unix directory procedures opendir, closedir,
-and readdir.  We can't use the procedures supplied in sysdep.c,
-so we provide them here.  */
-struct direct dir_static;       /* simulated directory contents */
-static HANDLE dir_find_handle = INVALID_HANDLE_VALUE;
-static int    dir_is_fat;
-static char   dir_pathname[MAXPATHLEN+1];
-extern Lisp_Object Vwin32_downcase_file_names;
-DIR *
-opendir (char *filename)
-{
-DIR *dirp;
-/* Opening is done by FindFirstFile.  However, a read is inherent to
-this operation, so we defer the open until read time.  */
-if (!(dirp = (DIR *) xmalloc (sizeof (DIR))))
-return NULL;
-if (dir_find_handle != INVALID_HANDLE_VALUE)
-return NULL;
-dirp->dd_fd = 0;
-dirp->dd_loc = 0;
-dirp->dd_size = 0;
-strncpy (dir_pathname, filename, MAXPATHLEN);
-dir_pathname[MAXPATHLEN] = '\0';
-dir_is_fat = is_fat_volume (filename, NULL);
-return dirp;
-}
-void
-closedir (DIR *dirp)
-{
-/* If we have a find-handle open, close it.  */
-if (dir_find_handle != INVALID_HANDLE_VALUE)
-{
-FindClose (dir_find_handle);
-dir_find_handle = INVALID_HANDLE_VALUE;
-}
-xfree ((char *) dirp);
-}
-struct direct *
-readdir (DIR *dirp)
-{
-WIN32_FIND_DATA find_data;
-/* If we aren't dir_finding, do a find-first, otherwise do a find-next. */
-if (dir_find_handle == INVALID_HANDLE_VALUE)
-{
-char filename[MAXNAMLEN + 3];
-int ln;
-strcpy (filename, dir_pathname);
-ln = strlen (filename) - 1;
-if (!IS_DIRECTORY_SEP (filename[ln]))
-	strcat (filename, "\\");
-strcat (filename, "*");
-dir_find_handle = FindFirstFile (filename, &find_data);
-if (dir_find_handle == INVALID_HANDLE_VALUE)
-	return NULL;
-}
-else
-{
-if (!FindNextFile (dir_find_handle, &find_data))
-	return NULL;
-}
-/* Emacs never uses this value, so don't bother making it match
-value returned by stat().  */
-dir_static.d_ino = 1;
-dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3 +
-dir_static.d_namlen - dir_static.d_namlen % 4;
-dir_static.d_namlen = strlen (find_data.cFileName);
-strcpy (dir_static.d_name, find_data.cFileName);
-if (dir_is_fat)
-_strlwr (dir_static.d_name);
-else if (!NILP (Vwin32_downcase_file_names))
-{
-REGISTER char *p;
-for (p = dir_static.d_name; *p; p++)
-	if (*p >= 'a' && *p <= 'z')
-	  break;
-if (!*p)
-	_strlwr (dir_static.d_name);
-}
-return &dir_static;
 }
 /* Emulate getpwuid, getpwnam and others.  */
 #define PASSWD_FIELD_SIZE 256
 /* Remove all CR's that are followed by a LF.
 (From msdos.c...probably should figure out a way to share it,
 although this code isn't going to ever change.)  */
 int
-crlf_to_lf (n, buf)
+crlf_to_lf (n, buf, lf_count)
 REGISTER int n;
 REGISTER unsigned char *buf;
+REGISTER unsigned *lf_count;
 {
 unsigned char *np = buf;
 unsigned char *startp = buf;
 unsigned char *endp = buf + n;
 if (n == 0)
 return n;
 while (buf < endp - 1)
 {
+if (*buf == 0x0a)
+	(*lf_count)++;
 if (*buf == 0x0d)
 	{
 	  if (*(++buf) != 0x0a)
 	    *np++ = 0x0d;
 	}
 else
 	*np++ = *buf++;
 }
 if (buf < endp)
+{
+if (*buf == 0x0a)
+	(*lf_count)++;
 *np++ = *buf++;
+}
 return np - startp;
 }
+/* Parse the root part of file name, if present.  Return length and
+optionally store pointer to char after root.  */
+static int
+parse_root (char * name, char ** pPath)
+{
+char * start = name;
+if (name == NULL)
+return 0;
+/* find the root name of the volume if given */
+if (isalpha (name[0]) && name[1] == ':')
+{
+/* skip past drive specifier */
+name += 2;
+if (IS_DIRECTORY_SEP (name[0]))
+	name++;
+}
+else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
+{
+int slashes = 2;
+name += 2;
+do
+{
+	  if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
+	    break;
+	  name++;
+	}
+while ( *name );
+if (IS_DIRECTORY_SEP (name[0]))
+	name++;
+}
+if (pPath)
+*pPath = name;
+return name - start;
+}
+/* Get long base name for name; name is assumed to be absolute.  */
+static int
+get_long_basename (char * name, char * buf, int size)
+{
+WIN32_FIND_DATA find_data;
+HANDLE dir_handle;
+int len = 0;
+#ifdef PIGSFLY
+char *p;
+/* If the last component of NAME has a wildcard character,
+return it as the basename.  */
+p = name + strlen (name);
+while (*p != '\\' && *p != ':' && p > name) p--;
+if (p > name) p++;
+if (strchr (p, '*') || strchr (p, '?'))
+{
+if ((len = strlen (p)) < size)
+	memcpy (buf, p, len + 1);
+else
+	len = 0;
+return len;
+}
+#endif
+dir_handle = FindFirstFile (name, &find_data);
+if (dir_handle != INVALID_HANDLE_VALUE)
+{
+if ((len = strlen (find_data.cFileName)) < size)
+	memcpy (buf, find_data.cFileName, len + 1);
+else
+	len = 0;
+FindClose (dir_handle);
+}
+return len;
+}
+/* Get long name for file, if possible (assumed to be absolute).  */
+BOOL
+win32_get_long_filename (char * name, char * buf, int size)
+{
+char * o = buf;
+char * p;
+char * q;
+char full[ MAX_PATH ];
+int len;
+len = strlen (name);
+if (len >= MAX_PATH)
+return FALSE;
+/* Use local copy for destructive modification.  */
+memcpy (full, name, len+1);
+unixtodos_filename (full);
+/* Copy root part verbatim.  */
+len = parse_root (full, &p);
+memcpy (o, full, len);
+o += len;
+size -= len;
+do
+{
+q = p;
+p = strchr (q, '\\');
+if (p) *p = '\0';
+len = get_long_basename (full, o, size);
+if (len > 0)
+	{
+	  o += len;
+	  size -= len;
+	  if (p != NULL)
+	    {
+	      *p++ = '\\';
+	      if (size < 2)
+		return FALSE;
+	      *o++ = '\\';
+	      size--;
+	      *o = '\0';
+	    }
+	}
+else
+	return FALSE;
+}
+while (p != NULL && *p);
+return TRUE;
+}
 /* Routines that are no-ops on NT but are defined to get Emacs to compile.  */
 int
 sigsetmask (int signal_mask)
 "HOME",
 "PRELOAD_WINSOCK",
 "emacs_dir",
 "EMACSLOADPATH",
 "SHELL",
+"CMDPROXY",
 "EMACSDATA",
 "EMACSPATH",
 "EMACSLOCKDIR",
-"INFOPATH",
+/* We no longer set INFOPATH because Info-default-directory-list
+	 is then ignored.  We use a hook in winnt.el instead.  */
+/*      "INFOPATH", */
 "EMACSDOC",
 "TERM",
 };
 for (i = 0; i < (sizeof (env_vars) / sizeof (env_vars[0])); i++)
 	    xfree (lpval);
 	  }
 }
 }
+/* Another special case: on NT, the PATH variable is actually named
+"Path" although cmd.exe (perhaps NT itself) arranges for
+environment variable lookup and setting to be case insensitive.
+However, Emacs assumes a fully case sensitive environment, so we
+need to change "Path" to "PATH" to match the expectations of
+various elisp packages.  We do this by the sneaky method of
+modifying the string in the C runtime environ entry.
+The same applies to COMSPEC.  */
+{
+char ** envp;
+for (envp = environ; *envp; envp++)
+if (_strnicmp (*envp, "PATH=", 5) == 0)
+	memcpy (*envp, "PATH=", 5);
+else if (_strnicmp (*envp, "COMSPEC=", 8) == 0)
+	memcpy (*envp, "COMSPEC=", 8);
+}
+/* Remember the initial working directory for getwd, then make the
+real wd be the location of emacs.exe to avoid conflicts when
+renaming or deleting directories.  (We also don't call chdir when
+running subprocesses for the same reason.)  */
+if (!GetCurrentDirectory (MAXPATHLEN, startup_dir))
+abort ();
+{
+char *p;
+char modname[MAX_PATH];
+if (!GetModuleFileName (NULL, modname, MAX_PATH))
+abort ();
+if ((p = strrchr (modname, '\\')) == NULL)
+abort ();
+*p = 0;
+SetCurrentDirectory (modname);
+}
 init_user_info ();
 }
 /* We don't have scripts to automatically determine the system configuration
 for Emacs before it's compiled, and we don't want to have to make the
 extern int __cdecl _free_osfhnd (int fd);
 /* parallel array of private info on file handles */
 filedesc fd_info [ MAXDESC ];
-static struct {
+typedef struct volume_info_data {
+struct volume_info_data * next;
+/* time when info was obtained */
+DWORD     timestamp;
+/* actual volume info */
+char *    root_dir;
 DWORD     serialnum;
 DWORD     maxcomp;
 DWORD     flags;
-char      name[32];
+char *    name;
-char      type[32];
+char *    type;
-} volume_info;
+} volume_info_data;
+/* Global referenced by various functions.  */
+static volume_info_data volume_info;
+/* Vector to indicate which drives are local and fixed (for which cached
+data never expires).  */
+static BOOL fixed_drives[26];
+/* Consider cached volume information to be stale if older than 10s,
+at least for non-local drives.  Info for fixed drives is never stale.  */
+#define DRIVE_INDEX( c ) ( (c) <= 'Z' ? (c) - 'A' : (c) - 'a' )
+#define VOLINFO_STILL_VALID( root_dir, info )		\
+( ( isalpha (root_dir[0]) &&				\
+fixed_drives[ DRIVE_INDEX (root_dir[0]) ] )	\
+|| GetTickCount () - info->timestamp < 10000 )
+/* Cache support functions.  */
+/* Simple linked list with linear search is sufficient.  */
+static volume_info_data *volume_cache = NULL;
+static volume_info_data *
+lookup_volume_info (char * root_dir)
+{
+volume_info_data * info;
+for (info = volume_cache; info; info = info->next)
+if (stricmp (info->root_dir, root_dir) == 0)
+break;
+return info;
+}
+static void
+add_volume_info (char * root_dir, volume_info_data * info)
+{
+info->root_dir = xstrdup (root_dir);
+info->next = volume_cache;
+volume_cache = info;
+}
+/* Wrapper for GetVolumeInformation, which uses caching to avoid
+performance penalty (~2ms on 486 for local drives, 7.5ms for local
+cdrom drive, ~5-10ms or more for remote drives on LAN).  */
+volume_info_data *
+GetCachedVolumeInformation (char * root_dir)
+{
+volume_info_data * info;
+char default_root[ MAX_PATH ];
+/* NULL for root_dir means use root from current directory.  */
+if (root_dir == NULL)
+{
+if (GetCurrentDirectory (MAX_PATH, default_root) == 0)
+	return NULL;
+parse_root (default_root, &root_dir);
+*root_dir = 0;
+root_dir = default_root;
+}
+/* Local fixed drives can be cached permanently.  Removable drives
+cannot be cached permanently, since the volume name and serial
+number (if nothing else) can change.  Remote drives should be
+treated as if they are removable, since there is no sure way to
+tell whether they are or not.  Also, the UNC association of drive
+letters mapped to remote volumes can be changed at any time (even
+by other processes) without notice.
+As a compromise, so we can benefit from caching info for remote
+volumes, we use a simple expiry mechanism to invalidate cache
+entries that are more than ten seconds old.  */
+#if 0
+/* No point doing this, because WNetGetConnection is even slower than
+GetVolumeInformation, consistently taking ~50ms on a 486 (FWIW,
+GetDriveType is about the only call of this type which does not
+involve network access, and so is extremely quick).  */
+/* Map drive letter to UNC if remote. */
+if ( isalpha( root_dir[0] ) && !fixed[ DRIVE_INDEX( root_dir[0] ) ] )
+{
+char remote_name[ 256 ];
+char drive[3] = { root_dir[0], ':' };
+if (WNetGetConnection (drive, remote_name, sizeof (remote_name))
+	  == NO_ERROR)
+	/* do something */ ;
+}
+#endif
+info = lookup_volume_info (root_dir);
+if (info == NULL || ! VOLINFO_STILL_VALID (root_dir, info))
+{
+char  name[ 256 ];
+DWORD     serialnum;
+DWORD     maxcomp;
+DWORD     flags;
+char  type[ 256 ];
+/* Info is not cached, or is stale. */
+if (!GetVolumeInformation (root_dir,
+			       name, sizeof (name),
+			       &serialnum,
+			       &maxcomp,
+			       &flags,
+			       type, sizeof (type)))
+return NULL;
+/* Cache the volume information for future use, overwriting existing
+entry if present.  */
+if (info == NULL)
+{
+	info = (volume_info_data *) xmalloc (sizeof (volume_info_data));
+	add_volume_info (root_dir, info);
+}
+else
+{
+	free (info->name);
+	free (info->type);
+}
+info->name = xstrdup (name);
+info->serialnum = serialnum;
+info->maxcomp = maxcomp;
+info->flags = flags;
+info->type = xstrdup (type);
+info->timestamp = GetTickCount ();
+}
+return info;
+}
 /* Get information on the volume where name is held; set path pointer to
 start of pathname in name (past UNC header\volume header if present).  */
 int
 get_volume_info (const char * name, const char ** pPath)
 {
 char temp[MAX_PATH];
 char *rootname = NULL;  /* default to current volume */
+volume_info_data * info;
 if (name == NULL)
 return FALSE;
 /* find the root name of the volume if given */
 }
 if (pPath)
 *pPath = name;
-if (GetVolumeInformation (rootname,
+info = GetCachedVolumeInformation (rootname);
-			    volume_info.name, 32,
+if (info != NULL)
-			    &volume_info.serialnum,
+{
-			    &volume_info.maxcomp,
+/* Set global referenced by other functions.  */
-			    &volume_info.flags,
+volume_info = *info;
-			    volume_info.type, 32))
-{
 return TRUE;
 }
 return FALSE;
 }
 {
 static char shortname[MAX_PATH];
 char * str = shortname;
 char c;
 char * path;
+const char * save_name = name;
 if (is_fat_volume (name, &path)) /* truncate to 8.3 */
 {
 REGISTER int left = 8;	/* maximum number of chars in part */
 REGISTER int extn = 0;	/* extension added? */
 strcpy (shortname, name);
 unixtodos_filename (shortname);
 }
 if (pPath)
-*pPath = shortname + (path - name);
+*pPath = shortname + (path - save_name);
 return shortname;
 }
+/* Emulate the Unix directory procedures opendir, closedir,
+and readdir.  We can't use the procedures supplied in sysdep.c,
+so we provide them here.  */
+struct direct dir_static;       /* simulated directory contents */
+static HANDLE dir_find_handle = INVALID_HANDLE_VALUE;
+static int    dir_is_fat;
+static char   dir_pathname[MAXPATHLEN+1];
+static WIN32_FIND_DATA dir_find_data;
+DIR *
+opendir (char *filename)
+{
+DIR *dirp;
+/* Opening is done by FindFirstFile.  However, a read is inherent to
+this operation, so we defer the open until read time.  */
+if (!(dirp = (DIR *) xmalloc (sizeof (DIR))))
+return NULL;
+if (dir_find_handle != INVALID_HANDLE_VALUE)
+return NULL;
+dirp->dd_fd = 0;
+dirp->dd_loc = 0;
+dirp->dd_size = 0;
+strncpy (dir_pathname, map_win32_filename (filename, NULL), MAXPATHLEN);
+dir_pathname[MAXPATHLEN] = '\0';
+dir_is_fat = is_fat_volume (filename, NULL);
+return dirp;
+}
+void
+closedir (DIR *dirp)
+{
+/* If we have a find-handle open, close it.  */
+if (dir_find_handle != INVALID_HANDLE_VALUE)
+{
+FindClose (dir_find_handle);
+dir_find_handle = INVALID_HANDLE_VALUE;
+}
+xfree ((char *) dirp);
+}
+struct direct *
+readdir (DIR *dirp)
+{
+/* If we aren't dir_finding, do a find-first, otherwise do a find-next. */
+if (dir_find_handle == INVALID_HANDLE_VALUE)
+{
+char filename[MAXNAMLEN + 3];
+int ln;
+strcpy (filename, dir_pathname);
+ln = strlen (filename) - 1;
+if (!IS_DIRECTORY_SEP (filename[ln]))
+	strcat (filename, "\\");
+strcat (filename, "*");
+dir_find_handle = FindFirstFile (filename, &dir_find_data);
+if (dir_find_handle == INVALID_HANDLE_VALUE)
+	return NULL;
+}
+else
+{
+if (!FindNextFile (dir_find_handle, &dir_find_data))
+	return NULL;
+}
+/* Emacs never uses this value, so don't bother making it match
+value returned by stat().  */
+dir_static.d_ino = 1;
+dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3 +
+dir_static.d_namlen - dir_static.d_namlen % 4;
+dir_static.d_namlen = strlen (dir_find_data.cFileName);
+strcpy (dir_static.d_name, dir_find_data.cFileName);
+if (dir_is_fat)
+_strlwr (dir_static.d_name);
+else if (!NILP (Vwin32_downcase_file_names))
+{
+REGISTER char *p;
+for (p = dir_static.d_name; *p; p++)
+	if (*p >= 'a' && *p <= 'z')
+	  break;
+if (!*p)
+	_strlwr (dir_static.d_name);
+}
+return &dir_static;
+}
 /* Shadow some MSVC runtime functions to map requests for long filenames
 to reasonable short names if necessary.  This was originally added to
 permit running Emacs on NT 3.1 on a FAT partition, which doesn't support
 long file names.  */
 fd = _open (map_win32_filename (path, NULL), oflag | _O_NOINHERIT, 0644);
 if (fd < 0)
 return NULL;
-return fdopen (fd, mode_save);
+return _fdopen (fd, mode_save);
 }
+/* This only works on NTFS volumes, but is useful to have.  */
 int
-sys_link (const char * path1, const char * path2)
+sys_link (const char * old, const char * new)
 {
-errno = EINVAL;
+HANDLE fileh;
+int   result = -1;
+char oldname[MAX_PATH], newname[MAX_PATH];
+if (old == NULL || new == NULL)
+{
+errno = ENOENT;
 return -1;
+}
+strcpy (oldname, map_win32_filename (old, NULL));
+strcpy (newname, map_win32_filename (new, NULL));
+fileh = CreateFile (oldname, 0, 0, NULL, OPEN_EXISTING,
+		      FILE_FLAG_BACKUP_SEMANTICS, NULL);
+if (fileh != INVALID_HANDLE_VALUE)
+{
+int wlen;
+/* Confusingly, the "alternate" stream name field does not apply
+when restoring a hard link, and instead contains the actual
+stream data for the link (ie. the name of the link to create).
+The WIN32_STREAM_ID structure before the cStreamName field is
+the stream header, which is then immediately followed by the
+stream data.  */
+struct {
+	WIN32_STREAM_ID wid;
+	WCHAR wbuffer[MAX_PATH];	/* extra space for link name */
+} data;
+wlen = MultiByteToWideChar (CP_ACP, MB_PRECOMPOSED, newname, -1,
+				  data.wid.cStreamName, MAX_PATH);
+if (wlen > 0)
+	{
+	  LPVOID context = NULL;
+	  DWORD wbytes = 0;
+	  data.wid.dwStreamId = BACKUP_LINK;
+	  data.wid.dwStreamAttributes = 0;
+	  data.wid.Size.LowPart = wlen * sizeof(WCHAR);
+	  data.wid.Size.HighPart = 0;
+	  data.wid.dwStreamNameSize = 0;
+	  if (BackupWrite (fileh, (LPBYTE)&data,
+			   offsetof (WIN32_STREAM_ID, cStreamName)
+			   + data.wid.Size.LowPart,
+			   &wbytes, FALSE, FALSE, &context)
+	      && BackupWrite (fileh, NULL, 0, &wbytes, TRUE, FALSE, &context))
+	    {
+	      /* succeeded */
+	      result = 0;
+	    }
+	  else
+	    {
+	      /* Should try mapping GetLastError to errno; for now just
+		 indicate a general error (eg. links not supported).  */
+	      errno = EINVAL;  // perhaps EMLINK?
+	    }
+	}
+CloseHandle (fileh);
+}
+else
+errno = ENOENT;
+return result;
 }
 int
 sys_mkdir (const char * path)
 {
 if (p = strrchr (temp, '\\'))
 	p++;
 else
 	p = temp;
-strcpy (p, "__XXXXXX");
-sys_mktemp (temp);
 /* Force temp name to require a manufactured 8.3 alias - this
 	 seems to make the second rename work properly. */
-strcat (temp, ".long");
+strcpy (p, "_rename_temp.XXXXXX");
+sys_mktemp (temp);
 if (rename (map_win32_filename (oldname, NULL), temp) < 0)
 	return -1;
 }
 /* Emulate Unix behaviour - newname is deleted if it already exists
 (at least if it is a file; don't do this for directories).
 However, don't do this if we are just changing the case of the file
 name - we will end up deleting the file we are trying to rename!  */
 newname = map_win32_filename (newname, NULL);
+/* TODO: Use GetInformationByHandle (on NT) to ensure newname and temp
+do not refer to the same file, eg. through share aliases.  */
 if (stricmp (newname, temp) != 0
 && (attr = GetFileAttributes (newname)) != -1
 && (attr & FILE_ATTRIBUTE_DIRECTORY) == 0)
 {
 _chmod (newname, 0666);
 pft->dwHighDateTime = (DWORD) (tmp / (4096.0 * 1024 * 1024));
 pft->dwLowDateTime = (DWORD) (tmp - pft->dwHighDateTime);
 }
 #endif
-/*  "PJW" algorithm (see the "Dragon" compiler book). */
+#if 0
+/* No reason to keep this; faking inode values either by hashing or even
+using the file index from GetInformationByHandle, is not perfect and
+so by default Emacs doesn't use the inode values on Windows.
+Instead, we now determine file-truename correctly (except for
+possible drive aliasing etc).  */
+/*  Modified version of "PJW" algorithm (see the "Dragon" compiler book). */
 static unsigned
-hashval (const char * str)
+hashval (const unsigned char * str)
 {
 unsigned h = 0;
-unsigned g;
 while (*str)
 {
 h = (h << 4) + *str++;
-if ((g = h & 0xf0000000) != 0)
+h ^= (h >> 28);
-	h = (h ^ (g >> 24)) & 0x0fffffff;
 }
 return h;
 }
 /* Return the hash value of the canonical pathname, excluding the
 drive/UNC header, to get a hopefully unique inode number. */
-static _ino_t
+static DWORD
 generate_inode_val (const char * name)
 {
 char fullname[ MAX_PATH ];
 char * p;
 unsigned hash;
-GetFullPathName (name, sizeof (fullname), fullname, &p);
+/* Get the truly canonical filename, if it exists.  (Note: this
-get_volume_info (fullname, &p);
+doesn't resolve aliasing due to subst commands, or recognise hard
+links.  */
+if (!win32_get_long_filename ((char *)name, fullname, MAX_PATH))
+abort ();
+parse_root (fullname, &p);
 /* Normal Win32 filesystems are still case insensitive. */
 _strlwr (p);
-hash = hashval (p);
+return hashval (p);
-return (_ino_t) (hash ^ (hash >> 16));
+}
-}
+#endif
 /* MSVC stat function can't cope with UNC names and has other bugs, so
 replace it with our own.  This also allows us to calculate consistent
 inode values without hacks in the main Emacs code. */
 int
 stat (const char * path, struct stat * buf)
 {
 char * name;
 WIN32_FIND_DATA wfd;
 HANDLE fh;
+DWORD fake_inode;
 int permission;
 int len;
 int rootdir = FALSE;
 if (path == NULL || buf == NULL)
 }
 else
 {
 if (IS_DIRECTORY_SEP (name[len-1]))
 	name[len - 1] = 0;
+/* (This is hacky, but helps when doing file completions on
+	 network drives.)  Optimize by using information available from
+	 active readdir if possible.  */
+if (dir_find_handle != INVALID_HANDLE_VALUE &&
+	  (len = strlen (dir_pathname)),
+	  strnicmp (name, dir_pathname, len) == 0 &&
+	  IS_DIRECTORY_SEP (name[len]) &&
+	  stricmp (name + len + 1, dir_static.d_name) == 0)
+	{
+	  /* This was the last entry returned by readdir.  */
+	  wfd = dir_find_data;
+	}
+else
+	{
 fh = FindFirstFile (name, &wfd);
 if (fh == INVALID_HANDLE_VALUE)
 	{
 	  errno = ENOENT;
 	  return -1;
 	}
 FindClose (fh);
 }
+}
 if (wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
 {
 buf->st_mode = _S_IFDIR;
 buf->st_nlink = 2;	/* doesn't really matter */
-}
+fake_inode = 0;		/* this doesn't either I think */
-else
+}
-{
+else if (!NILP (Vwin32_get_true_file_attributes))
-#if 0
+{
 /* This is more accurate in terms of gettting the correct number
 	 of links, but is quite slow (it is noticable when Emacs is
 	 making a list of file name completions). */
 BY_HANDLE_FILE_INFORMATION info;
-fh = CreateFile (name, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
+/* No access rights required to get info.  */
-		       NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+fh = CreateFile (name, 0, 0, NULL, OPEN_EXISTING, 0, NULL);
 if (GetFileInformationByHandle (fh, &info))
 	{
 	  switch (GetFileType (fh))
 	    {
 	    case FILE_TYPE_UNKNOWN:
 	    default:
 	      buf->st_mode = _S_IFCHR;
 	    }
 	  buf->st_nlink = info.nNumberOfLinks;
-	  /* Could use file index, but this is not guaranteed to be
+	  /* Might as well use file index to fake inode values, but this
-	     unique unless we keep a handle open all the time. */
+	     is not guaranteed to be unique unless we keep a handle open
-	  /* buf->st_ino = info.nFileIndexLow ^ info.nFileIndexHigh; */
+	     all the time (even then there are situations where it is
+	     not unique).  Reputedly, there are at most 48 bits of info
+	     (on NTFS, presumably less on FAT). */
+	  fake_inode = info.nFileIndexLow ^ info.nFileIndexHigh;
 	  CloseHandle (fh);
 	}
 else
 	{
 	  errno = EACCES;
 	  return -1;
 	}
-#else
+}
+else
+{
+/* Don't bother to make this information more accurate.  */
 buf->st_mode = _S_IFREG;
 buf->st_nlink = 1;
+fake_inode = 0;
+}
+#if 0
+/* Not sure if there is any point in this.  */
+if (!NILP (Vwin32_generate_fake_inodes))
+fake_inode = generate_inode_val (name);
+else if (fake_inode == 0)
+{
+/* For want of something better, try to make everything unique.  */
+static DWORD gen_num = 0;
+fake_inode = ++gen_num;
+}
 #endif
-}
+/* MSVC defines _ino_t to be short; other libc's might not.  */
+if (sizeof (buf->st_ino) == 2)
+buf->st_ino = fake_inode ^ (fake_inode >> 16);
+else
+buf->st_ino = fake_inode;
 /* consider files to belong to current user */
 buf->st_uid = the_passwd.pw_uid;
 buf->st_gid = the_passwd.pw_gid;
 /* volume_info is set indirectly by map_win32_filename */
 buf->st_dev = volume_info.serialnum;
 buf->st_rdev = volume_info.serialnum;
-buf->st_ino = generate_inode_val (name);
 buf->st_size = wfd.nFileSizeLow;
 /* Convert timestamps to Unix format. */
 buf->st_mtime = convert_time (wfd.ftLastWriteTime);
 {
 int rc;
 unsigned flags;
 child_process * cp;
-/* make pipe handles non-inheritable; when we spawn a child,
+/* make pipe handles non-inheritable; when we spawn a child, we
-we replace the relevant handle with an inheritable one. */
+replace the relevant handle with an inheritable one.  Also put
-rc = _pipe (phandles, 0, _O_NOINHERIT);
+pipes into binary mode; we will do text mode translation ourselves
+if required.  */
+rc = _pipe (phandles, 0, _O_NOINHERIT | _O_BINARY);
 if (rc == 0)
 {
-/* set internal flags, and put read and write handles into binary
-	 mode as necessary; if not in binary mode, set the MSVC internal
-	 FDEV (0x40) flag to prevent _read from treating ^Z as eof (this
-	 could otherwise allow Emacs to hang because it then waits
-	 indefinitely for the child process to exit, when it might not be
-	 finished). */
 flags = FILE_PIPE | FILE_READ;
 if (!NILP (Vbinary_process_output))
-	{
 	  flags |= FILE_BINARY;
-	  setmode (phandles[0], _O_BINARY);
-	}
-#if (_MSC_VER == 900)
-else
-	_osfile[phandles[0]] |= 0x40;
-#endif
 fd_info[phandles[0]].flags = flags;
 flags = FILE_PIPE | FILE_WRITE;
 if (!NILP (Vbinary_process_input))
-	{
 	  flags |= FILE_BINARY;
-	  setmode (phandles[1], _O_BINARY);
-	}
-#if (_MSC_VER == 900)
-else
-	_osfile[phandles[1]] |= 0x40;
-#endif
 fd_info[phandles[1]].flags = flags;
 }
 return rc;
 }
 cp->status = STATUS_READ_IN_PROGRESS;
 if (fd_info[fd].flags & FILE_PIPE)
 {
-/* Use read to get CRLF translation */
 rc = _read (fd, &cp->chr, sizeof (char));
 /* Give subprocess time to buffer some more output for us before
 	 reporting that input is available; we need this because Win95
 	 connects DOS programs to pipes by making the pipe appear to be
 int
 sys_read (int fd, char * buffer, unsigned int count)
 {
 int nchars;
-int extra = 0;
 int to_read;
 DWORD waiting;
+char * orig_buffer = buffer;
 if (fd < 0 || fd >= MAXDESC)
 {
 errno = EBADF;
 return -1;
 if ((fd_info[fd].flags & FILE_READ) == 0)
 {
 	  errno = EBADF;
 	  return -1;
+	}
+nchars = 0;
+/* re-read CR carried over from last read */
+if (fd_info[fd].flags & FILE_LAST_CR)
+	{
+	  if (fd_info[fd].flags & FILE_BINARY) abort ();
+	  *buffer++ = 0x0d;
+	  count--;
+	  nchars++;
+	  fd_info[fd].flags &= ~FILE_LAST_CR;
 	}
 /* presence of a child_process structure means we are operating in
 	 non-blocking mode - otherwise we just call _read directly.
 	 Note that the child_process structure might be missing because
 	  switch (current_status)
 	    {
 	    case STATUS_READ_FAILED:
 	    case STATUS_READ_ERROR:
-	      /* report normal EOF */
+	      /* report normal EOF if nothing in buffer */
-	      return 0;
+	      if (nchars <= 0)
+		fd_info[fd].flags |= FILE_AT_EOF;
+	      return nchars;
 	    case STATUS_READ_READY:
 	    case STATUS_READ_IN_PROGRESS:
 	      DebPrint (("sys_read called when read is in progress\n"));
 	      errno = EWOULDBLOCK;
 	    case STATUS_READ_SUCCEEDED:
 	      /* consume read-ahead char */
 	      *buffer++ = cp->chr;
 	      count--;
-	      extra = 1;
+	      nchars++;
 	      cp->status = STATUS_READ_ACKNOWLEDGED;
 	      ResetEvent (cp->char_avail);
 	    case STATUS_READ_ACKNOWLEDGED:
 	      break;
 	  if (fd_info[fd].flags & FILE_PIPE)
 	    {
 	      PeekNamedPipe ((HANDLE) _get_osfhandle (fd), NULL, 0, NULL, &waiting, NULL);
 	      to_read = min (waiting, (DWORD) count);
-	      /* Use read to get CRLF translation */
+	      if (to_read > 0)
-	      nchars = _read (fd, buffer, to_read);
+		nchars += _read (fd, buffer, to_read);
 	    }
 #ifdef HAVE_SOCKETS
 	  else /* FILE_SOCKET */
 	    {
 	      if (winsock_lib == NULL) abort ();
 	      /* do the equivalent of a non-blocking read */
 	      pfn_ioctlsocket (SOCK_HANDLE (fd), FIONREAD, &waiting);
-	      if (waiting == 0 && extra == 0)
+	      if (waiting == 0 && nchars == 0)
 	        {
 		  h_errno = errno = EWOULDBLOCK;
 		  return -1;
 		}
-	      nchars = 0;
 	      if (waiting)
 	        {
 		  /* always use binary mode for sockets */
-		  nchars = pfn_recv (SOCK_HANDLE (fd), buffer, count, 0);
+		  int res = pfn_recv (SOCK_HANDLE (fd), buffer, count, 0);
-		  if (nchars == SOCKET_ERROR)
+		  if (res == SOCKET_ERROR)
 		    {
 		      DebPrint(("sys_read.recv failed with error %d on socket %ld\n",
 				pfn_WSAGetLastError (), SOCK_HANDLE (fd)));
-		      if (extra == 0)
-		        {
 			  set_errno ();
 			  return -1;
 			}
-		      nchars = 0;
+		  nchars += res;
-		    }
 		}
 	    }
 #endif
 	}
 else
-	nchars = _read (fd, buffer, count);
+	{
+	  int nread = _read (fd, buffer, count);
+	  if (nread >= 0)
+	    nchars += nread;
+	  else if (nchars == 0)
+	    nchars = nread;
+	}
+if (nchars <= 0)
+	fd_info[fd].flags |= FILE_AT_EOF;
+/* Perform text mode translation if required.  */
+else if ((fd_info[fd].flags & FILE_BINARY) == 0)
+	{
+	  unsigned lf_count = 0;
+	  nchars = crlf_to_lf (nchars, orig_buffer, &lf_count);
+	  /* If buffer contains only CR, return that.  To be absolutely
+	     sure we should attempt to read the next char, but in
+	     practice a CR to be followed by LF would not appear by
+	     itself in the buffer.  */
+	  if (nchars > 1 && orig_buffer[nchars - 1] == 0x0d)
+	    {
+	      fd_info[fd].flags |= FILE_LAST_CR;
+	      nchars--;
+	    }
+}
 }
 else
 nchars = _read (fd, buffer, count);
-return nchars + extra;
+return nchars;
 }
 /* For now, don't bother with a non-blocking mode */
 int
 sys_write (int fd, const void * buffer, unsigned int count)
 errno = EBADF;
 return -1;
 }
 if (fd_info[fd].flags & (FILE_PIPE | FILE_SOCKET))
+{
 if ((fd_info[fd].flags & FILE_WRITE) == 0)
 {
 	errno = EBADF;
 	return -1;
 }
+/* Perform text mode translation if required.  */
+if ((fd_info[fd].flags & FILE_BINARY) == 0)
+	{
+	  char * tmpbuf = alloca (count * 2);
+	  unsigned char * src = (void *)buffer;
+	  unsigned char * dst = tmpbuf;
+	  int nbytes = count;
+	  while (1)
+	    {
+	      unsigned char *next;
+	      /* copy next line or remaining bytes */
+	      next = _memccpy (dst, src, '\n', nbytes);
+	      if (next)
+		{
+		  /* copied one line ending with '\n' */
+		  int copied = next - dst;
+		  nbytes -= copied;
+		  src += copied;
+		  /* insert '\r' before '\n' */
+		  next[-1] = '\r';
+		  next[0] = '\n';
+		  dst = next + 1;
+		  count++;
+		}
+	      else
+		/* copied remaining partial line -> now finished */
+		break;
+	    }
+	  buffer = tmpbuf;
+	}
+}
 #ifdef HAVE_SOCKETS
 if (fd_info[fd].flags & FILE_SOCKET)
 {
 if (winsock_lib == NULL) abort ();
 nchars =  pfn_send (SOCK_HANDLE (fd), buffer, count, 0);
 #ifdef HAVE_SOCKETS
 /* shutdown the socket interface if necessary */
 term_winsock ();
 #endif
 }
-extern BOOL dos_process_running;
 void
 init_ntproc ()
 {
 #ifdef HAVE_SOCKETS
 if (stdin_save != INVALID_HANDLE_VALUE)
 _open_osfhandle ((long) stdin_save, O_TEXT);
 else
 _open ("nul", O_TEXT | O_NOINHERIT | O_RDONLY);
-fdopen (0, "r");
+_fdopen (0, "r");
 if (stdout_save != INVALID_HANDLE_VALUE)
 _open_osfhandle ((long) stdout_save, O_TEXT);
 else
 _open ("nul", O_TEXT | O_NOINHERIT | O_WRONLY);
-fdopen (1, "w");
+_fdopen (1, "w");
 if (stderr_save != INVALID_HANDLE_VALUE)
 _open_osfhandle ((long) stderr_save, O_TEXT);
 else
 _open ("nul", O_TEXT | O_NOINHERIT | O_WRONLY);
-fdopen (2, "w");
+_fdopen (2, "w");
 }
-/* Restrict Emacs to running only one DOS program at a time (with any
-number of Win32 programs).  This is to prevent the user from
-running into problems with DOS programs being run in the same VDM
-under both Windows 95 and Windows NT.
-Note that it is possible for Emacs to run DOS programs in separate
-VDMs, but unfortunately the pipe implementation on Windows 95 then
-fails to report when the DOS process exits (which is supposed to
-break the pipe).  Until this bug is fixed, or we can devise a
-work-around, we must try to avoid letting the user start more than
-one DOS program if possible.  */
-dos_process_running = FALSE;
 /* unfortunately, atexit depends on implementation of malloc */
 /* atexit (term_ntproc); */
 signal (SIGABRT, term_ntproc);
-}
+/* determine which drives are fixed, for GetCachedVolumeInformation */
+{
+/* GetDriveType must have trailing backslash. */
+char drive[] = "A:\\";
+/* Loop over all possible drive letters */
+while ( *drive <= 'Z' )
+{
+/* Record if this drive letter refers to a fixed drive. */
+fixed_drives[ DRIVE_INDEX (*drive) ] =
+	(GetDriveType (drive) == DRIVE_FIXED);
+(*drive)++;
+}
+}
+}
 #ifndef HAVE_TTY
 Lisp_Object Vstdio_str;
 Lisp_Object
 tty_semi_canonicalize_console_connection (Lisp_Object connection,

Mercurial > hg > xemacs-beta

comparison src/nt.c @ 209:41ff10fd062f r20-4b3