(chdir_do): Fixed call to restore_cwd

src/misc.c

@@ -1,5 +1,7 @@
 /* Miscellaneous functions, not really specific to GNU tar.
-   Copyright (C) 1988, 92, 94, 95, 96, 97 Free Software Foundation, Inc.
+
+   Copyright (C) 1988, 1992, 1994, 1995, 1996, 1997, 1999, 2000, 2001,
+   2003 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
@@ -13,119 +15,73 @@
 
    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
-   59 Place - Suite 330, Boston, MA 02111-1307, USA.  */
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 
 #include "system.h"
-
-#include "backupfile.h"
 #include "rmt.h"
-
-/* The following inclusion for crosschecking prototypes, only.  */
 #include "common.h"
+#include <quotearg.h>
+#include <save-cwd.h>
+
+static void call_arg_fatal (char const *, char const *)
+     __attribute__ ((noreturn));
 
 /* Handling strings.  */
 
-#define ISPRINT(Char) (ISASCII (Char) && isprint (Char))
-
-/*-------------------------------------------------------------------------.
-| Assign STRING to a copy of VALUE if not NULL, or to NULL.  If STRING was |
-| not NULL, it is freed first.						   |
-`-------------------------------------------------------------------------*/
-
+/* Assign STRING to a copy of VALUE if not zero, or to zero.  If
+   STRING was nonzero, it is freed first.  */
 void
 assign_string (char **string, const char *value)
 {
   if (*string)
     free (*string);
-  *string = value ? xstrdup (value) : NULL;
+  *string = value ? xstrdup (value) : 0;
 }
 
-/*------------------------------------------------------------------------.
-| Allocate a copy of the string quoted as in C, and returns that.  If the |
-| string does not have to be quoted, it returns the NULL string.  The	  |
-| allocated copy should normally be freed with free() after the caller is |
-| done with it.								  |
-| 									  |
-| This is used in two contexts only: either listing a tar file for the	  |
-| --list (-t) option, or generating the directory file in incremental	  |
-| dumps.								  |
-`------------------------------------------------------------------------*/
-
+/* Allocate a copy of the string quoted as in C, and returns that.  If
+   the string does not have to be quoted, it returns a null pointer.
+   The allocated copy should normally be freed with free() after the
+   caller is done with it.
+
+   This is used in one context only: generating the directory file in
+   incremental dumps.  The quoted string is not intended for human
+   consumption; it is intended only for unquote_string.  The quoting
+   is locale-independent, so that users needn't worry about locale
+   when reading directory files.  This means that we can't use
+   quotearg, as quotearg is locale-dependent and is meant for human
+   consumption.  */
 char *
 quote_copy_string (const char *string)
 {
   const char *source = string;
-  char *destination = NULL;
-  char *buffer = NULL;
+  char *destination = 0;
+  char *buffer = 0;
   int copying = 0;
 
   while (*source)
     {
-      int character = (unsigned char) *source++;
+      int character = *source++;
 
-      if (character == '\\')
+      switch (character)
 	{
+	case '\n': case '\\':
 	  if (!copying)
 	    {
-	      int length = (source - string) - 1;
+	      size_t length = (source - string) - 1;
 
 	      copying = 1;
-	      buffer = (char *) xmalloc (length + 5 + strlen (source) * 4);
-	      memcpy (buffer, string, (size_t) length);
+	      buffer = xmalloc (length + 2 + 2 * strlen (source) + 1);
+	      memcpy (buffer, string, length);
 	      destination = buffer + length;
 	    }
 	  *destination++ = '\\';
-	  *destination++ = '\\';
-	}
-      else if (ISPRINT (character))
-	{
+	  *destination++ = character == '\\' ? '\\' : 'n';
+	  break;
+
+	default:
 	  if (copying)
 	    *destination++ = character;
-	}
-      else
-	{
-	  if (!copying)
-	    {
-	      int length = (source - string) - 1;
-
-	      copying = 1;
-	      buffer = (char *) xmalloc (length + 5 + strlen (source) * 4);
-	      memcpy (buffer, string, (size_t) length);
-	      destination = buffer + length;
-	    }
-	  *destination++ = '\\';
-	  switch (character)
-	    {
-	    case '\n':
-	      *destination++ = 'n';
-	      break;
-
-	    case '\t':
-	      *destination++ = 't';
-	      break;
-
-	    case '\f':
-	      *destination++ = 'f';
-	      break;
-
-	    case '\b':
-	      *destination++ = 'b';
-	      break;
-
-	    case '\r':
-	      *destination++ = 'r';
-	      break;
-
-	    case '\177':
-	      *destination++ = '?';
-	      break;
-
-	    default:
-	      *destination++ = (character >> 6) + '0';
-	      *destination++ = ((character >> 3) & 07) + '0';
-	      *destination++ = (character & 07) + '0';
-	      break;
-	    }
+	  break;
 	}
     }
   if (copying)
@@ -133,21 +89,19 @@ quote_copy_string (const char *string)
       *destination = '\0';
       return buffer;
     }
-  return NULL;
+  return 0;
 }
 
-/*-------------------------------------------------------------------------.
-| Takes a quoted C string (like those produced by quote_copy_string) and   |
-| turns it back into the un-quoted original.  This is done in place.	   |
-| Returns 0 only if the string was not properly quoted, but completes the  |
-| unquoting anyway.							   |
-| 									   |
-| This is used for reading the saved directory file in incremental dumps.  |
-| It is used for decoding old `N' records (demangling names).  But also,   |
-| it is used for decoding file arguments, would they come from the shell   |
-| or a -T file, and for decoding the --exclude argument.		   |
-`-------------------------------------------------------------------------*/
+/* Takes a quoted C string (like those produced by quote_copy_string)
+   and turns it back into the un-quoted original.  This is done in
+   place.  Returns 0 only if the string was not properly quoted, but
+   completes the unquoting anyway.
 
+   This is used for reading the saved directory file in incremental
+   dumps.  It is used for decoding old `N' records (demangling names).
+   But also, it is used for decoding file arguments, would they come
+   from the shell or a -T file, and for decoding the --exclude
+   argument.  */
 int
 unquote_string (char *string)
 {
@@ -155,6 +109,11 @@ unquote_string (char *string)
   char *source = string;
   char *destination = string;
 
+  /* Escape sequences other than \\ and \n are no longer generated by
+     quote_copy_string, but accept them for backwards compatibility,
+     and also because unquote_string is used for purposes other than
+     parsing the output of quote_copy_string.  */
+
   while (*source)
     if (*source == '\\')
       switch (*++source)
@@ -238,169 +197,142 @@ unquote_string (char *string)
   return result;
 }
 
-/* Sorting lists.  */
+/* File handling.  */
 
-/*---.
-| ?  |
-`---*/
+/* Saved names in case backup needs to be undone.  */
+static char *before_backup_name;
+static char *after_backup_name;
 
-char *
-merge_sort (char *list, int length, int offset, int (*compare) (char *, char *))
+/* Return 1 if PATH is obviously "." or "/".  */
+static bool
+must_be_dot_or_slash (char const *path)
 {
-  char *first_list;
-  char *second_list;
-  int first_length;
-  int second_length;
-  char *result;
-  char **merge_point;
-  char *cursor;
-  int counter;
-
-#define SUCCESSOR(Pointer) \
-  (*((char **) (((char *) (Pointer)) + offset)))
-
-  if (length == 1)
-    return list;
+  path += FILESYSTEM_PREFIX_LEN (path);
 
-  if (length == 2)
+  if (ISSLASH (path[0]))
     {
-      if ((*compare) (list, SUCCESSOR (list)) > 0)
-	{
-	  result = SUCCESSOR (list);
-	  SUCCESSOR (result) = list;
-	  SUCCESSOR (list) = NULL;
-	  return result;
-	}
-      return list;
+      for (;;)
+	if (ISSLASH (path[1]))
+	  path++;
+	else if (path[1] == '.' && ISSLASH (path[2 + (path[2] == '.')]))
+	  path += 2 + (path[2] == '.');
+	else
+	  return ! path[1];
     }
-
-  first_list = list;
-  first_length = (length + 1) / 2;
-  second_length = length / 2;
-  for (cursor = list, counter = first_length - 1;
-       counter;
-       cursor = SUCCESSOR (cursor), counter--)
-    continue;
-  second_list = SUCCESSOR (cursor);
-  SUCCESSOR (cursor) = NULL;
-
-  first_list = merge_sort (first_list, first_length, offset, compare);
-  second_list = merge_sort (second_list, second_length, offset, compare);
-
-  merge_point = &result;
-  while (first_list && second_list)
-    if ((*compare) (first_list, second_list) < 0)
-      {
-	cursor = SUCCESSOR (first_list);
-	*merge_point = first_list;
-	merge_point = &SUCCESSOR (first_list);
-	first_list = cursor;
-      }
-    else
-      {
-	cursor = SUCCESSOR (second_list);
-	*merge_point = second_list;
-	merge_point = &SUCCESSOR (second_list);
-	second_list = cursor;
-      }
-  if (first_list)
-    *merge_point = first_list;
   else
-    *merge_point = second_list;
-
-  return result;
+    {
+      while (path[0] == '.' && ISSLASH (path[1]))
+	{
+	  path += 2;
+	  while (ISSLASH (*path))
+	    path++;
+	}
 
-#undef SUCCESSOR
+      return ! path[0] || (path[0] == '.' && ! path[1]);
+    }
 }
-
-/* File handling.  */
-
-/* Saved names in case backup needs to be undone.  */
-static char *before_backup_name = NULL;
-static char *after_backup_name = NULL;
 
-/*------------------------------------------------------------------------.
-| Returns nonzero if p is `.' or `..'.  This could be a macro for speed.  |
-`------------------------------------------------------------------------*/
+/* Some implementations of rmdir let you remove '.' or '/'.
+   Report an error with errno set to zero for obvious cases of this;
+   otherwise call rmdir.  */
+static int
+safer_rmdir (const char *path)
+{
+  if (must_be_dot_or_slash (path))
+    {
+      errno = 0;
+      return -1;
+    }
 
-/* Early Solaris 2.4 readdir may return d->d_name as `' in NFS-mounted
-   directories.  The workaround here skips `' just like `.'.  Without it,
-   GNU tar would then treat `' much like `.' and loop endlessly.  */
+  return rmdir (path);
+}
 
+/* Remove PATH, returning 1 on success.  If PATH is a directory, then
+   if OPTION is RECURSIVE_REMOVE_OPTION is set remove PATH
+   recursively; otherwise, remove it only if it is empty.  If PATH is
+   a directory that cannot be removed (e.g., because it is nonempty)
+   and if OPTION is WANT_DIRECTORY_REMOVE_OPTION, then return -1.
+   Return 0 on error, with errno set; if PATH is obviously the working
+   directory return zero with errno set to zero.  */
 int
-is_dot_or_dotdot (const char *p)
+remove_any_file (const char *path, enum remove_option option)
 {
-  return (p[0] == '\0'
-	  || (p[0] == '.' && (p[1] == '\0'
-			      || (p[1] == '.' && p[2] == '\0'))));
-}
+  /* Try unlink first if we are not root, as this saves us a system
+     call in the common case where we're removing a non-directory.  */
+  if (! we_are_root)
+    {
+      if (unlink (path) == 0)
+	return 1;
 
-/*-------------------------------------------------------------------------.
-| Delete PATH, whatever it might be.  If RECURSE, first recursively delete |
-| the contents of PATH when it is a directory.  Return zero on any error,  |
-| with errno set.  As a special case, if we fail to delete a directory	   |
-| when not RECURSE, do not set errno (just be tolerant to this error).	   |
-`-------------------------------------------------------------------------*/
+      /* POSIX 1003.1-2001 requires EPERM when attempting to unlink a
+	 directory without appropriate privileges, but many Linux
+	 kernels return the more-sensible EISDIR.  */
+      if (errno != EPERM && errno != EISDIR)
+	return 0;
+    }
 
-int
-remove_any_file (const char *path, int recurse)
-{
-  struct stat stat_buffer;
+  if (safer_rmdir (path) == 0)
+    return 1;
 
-  if (lstat (path, &stat_buffer) < 0)
-    return 0;
+  switch (errno)
+    {
+    case ENOTDIR:
+      return we_are_root && unlink (path) == 0;
 
-  if (S_ISDIR (stat_buffer.st_mode))
-    if (recurse)
-      {
-	DIR *dirp = opendir (path);
-	struct dirent *dp;
+    case 0:
+    case EEXIST:
+#if defined ENOTEMPTY && ENOTEMPTY != EEXIST
+    case ENOTEMPTY:
+#endif
+      switch (option)
+	{
+	case ORDINARY_REMOVE_OPTION:
+	  break;
 
-	if (dirp == NULL)
-	  return 0;
+	case WANT_DIRECTORY_REMOVE_OPTION:
+	  return -1;
 
-	while (dp = readdir (dirp), dp && !is_dot_or_dotdot (dp->d_name))
+	case RECURSIVE_REMOVE_OPTION:
 	  {
-	    char *path_buffer = new_name (path, dp->d_name);
+	    char *directory = savedir (path);
+	    char const *entry;
+	    size_t entrylen;
 
-	    if (!remove_any_file (path_buffer, 1))
-	      {
-		int saved_errno = errno;
+	    if (! directory)
+	      return 0;
 
+	    for (entry = directory;
+		 (entrylen = strlen (entry)) != 0;
+		 entry += entrylen + 1)
+	      {
+		char *path_buffer = new_name (path, entry);
+		int r = remove_any_file (path_buffer, 1);
+		int e = errno;
 		free (path_buffer);
-		closedir (dirp);
-		errno = saved_errno; /* FIXME: errno should be read-only */
-		return 0;
+
+		if (! r)
+		  {
+		    free (directory);
+		    errno = e;
+		    return 0;
+		  }
 	      }
-	    free (path_buffer);
+
+	    free (directory);
+	    return safer_rmdir (path) == 0;
 	  }
-	closedir (dirp);
-	return rmdir (path) >= 0;
-      }
-    else
-      {
-	/* FIXME: Saving errno might not be needed anymore, now that
-	   extract_archive tests for the special case before recovery.  */
-	int saved_errno = errno;
-
-	if (rmdir (path) >= 0)
-	  return 1;
-	errno = saved_errno;	/* FIXME: errno should be read-only */
-	return 0;
-      }
+	}
+      break;
+    }
 
-  return unlink (path) >= 0;
+  return 0;
 }
 
-/*-------------------------------------------------------------------------.
-| Check if PATH already exists and make a backup of it right now.  Return  |
-| success (nonzero) only if the backup in either unneeded, or successful.  |
-| 									   |
-| For now, directories are considered to never need backup.  If ARCHIVE is |
-| nonzero, this is the archive and so, we do not have to backup block or   |
-| character devices, nor remote entities.				   |
-`-------------------------------------------------------------------------*/
-
+/* Check if PATH already exists and make a backup of it right now.
+   Return success (nonzero) only if the backup in either unneeded, or
+   successful.  For now, directories are considered to never need
+   backup.  If ARCHIVE is nonzero, this is the archive and so, we do
+   not have to backup block or character devices, nor remote entities.  */
 int
 maybe_backup_file (const char *path, int archive)
 {
@@ -416,22 +348,15 @@ maybe_backup_file (const char *path, int archive)
       if (errno == ENOENT)
 	return 1;
 
-      ERROR ((0, errno, "%s", path));
+      stat_error (path);
       return 0;
     }
 
   if (S_ISDIR (file_stat.st_mode))
     return 1;
 
-#ifdef S_ISBLK
-  if (archive && S_ISBLK (file_stat.st_mode))
+  if (archive && (S_ISBLK (file_stat.st_mode) || S_ISCHR (file_stat.st_mode)))
     return 1;
-#endif
-
-#ifdef S_ISCHR
-  if (archive && S_ISCHR (file_stat.st_mode))
-    return 1;
-#endif
 
   assign_string (&before_backup_name, path);
 
@@ -440,42 +365,500 @@ maybe_backup_file (const char *path, int archive)
      possible, real problems are unlikely.  Doing any better would require a
      convention, GNU-wide, for all programs doing backups.  */
 
-  assign_string (&after_backup_name, NULL);
-  after_backup_name = find_backup_file_name (path);
-  if (after_backup_name == NULL)
-    FATAL_ERROR ((0, 0, "Virtual memory exhausted"));
+  assign_string (&after_backup_name, 0);
+  after_backup_name = find_backup_file_name (path, backup_type);
+  if (! after_backup_name)
+    xalloc_die ();
 
   if (rename (before_backup_name, after_backup_name) == 0)
     {
       if (verbose_option)
-	fprintf (stdlis, _("Renaming previous `%s' to `%s'\n"),
-		 before_backup_name, after_backup_name);
+	fprintf (stdlis, _("Renaming %s to %s\n"),
+		 quote_n (0, before_backup_name),
+		 quote_n (1, after_backup_name));
       return 1;
     }
-
-  /* The backup operation failed.  */
-
-  ERROR ((0, errno, _("%s: Cannot rename for backup"), before_backup_name));
-  assign_string (&after_backup_name, NULL);
-  return 0;
+  else
+    {
+      /* The backup operation failed.  */
+      int e = errno;
+      ERROR ((0, e, _("%s: Cannot rename to %s"),
+	      quotearg_colon (before_backup_name),
+	      quote_n (1, after_backup_name)));
+      assign_string (&after_backup_name, 0);
+      return 0;
+    }
 }
 
-/*-----------------------------------------------------------------------.
-| Try to restore the recently backed up file to its original name.  This |
-| is usually only needed after a failed extraction.			 |
-`-----------------------------------------------------------------------*/
-
+/* Try to restore the recently backed up file to its original name.
+   This is usually only needed after a failed extraction.  */
 void
 undo_last_backup (void)
 {
   if (after_backup_name)
     {
       if (rename (after_backup_name, before_backup_name) != 0)
-	ERROR ((0, errno, _("%s: Cannot rename from backup"),
-		before_backup_name));
+	{
+	  int e = errno;
+	  ERROR ((0, e, _("%s: Cannot rename to %s"),
+		  quotearg_colon (after_backup_name),
+		  quote_n (1, before_backup_name)));
+	}
       if (verbose_option)
-	fprintf (stdlis, _("Renaming `%s' back to `%s'\n"),
-		 after_backup_name, before_backup_name);
-      assign_string (&after_backup_name, NULL);
+	fprintf (stdlis, _("Renaming %s back to %s\n"),
+		 quote_n (0, after_backup_name),
+		 quote_n (1, before_backup_name));
+      assign_string (&after_backup_name, 0);
     }
 }
+
+/* Depending on DEREF, apply either stat or lstat to (NAME, BUF).  */
+int
+deref_stat (bool deref, char const *name, struct stat *buf)
+{
+  return deref ? stat (name, buf) : lstat (name, buf);
+}
+
+/* A description of a working directory.  */
+struct wd
+{
+  char const *name;
+  int saved;
+  struct saved_cwd saved_cwd;
+};
+
+/* A vector of chdir targets.  wd[0] is the initial working directory.  */
+static struct wd *wd;
+
+/* The number of working directories in the vector.  */
+static size_t wds;
+
+/* The allocated size of the vector.  */
+static size_t wd_alloc;
+
+/* DIR is the operand of a -C option; add it to vector of chdir targets,
+   and return the index of its location.  */
+int
+chdir_arg (char const *dir)
+{
+  if (wds == wd_alloc)
+    {
+      wd_alloc = 2 * (wd_alloc + 1);
+      wd = xrealloc (wd, sizeof *wd * wd_alloc);
+      if (! wds)
+	{
+	  wd[wds].name = ".";
+	  wd[wds].saved = 0;
+	  wds++;
+	}
+    }
+
+  /* Optimize the common special case of the working directory,
+     or the working directory as a prefix.  */
+  if (dir[0])
+    {
+      while (dir[0] == '.' && ISSLASH (dir[1]))
+	for (dir += 2;  ISSLASH (*dir);  dir++)
+	  continue;
+      if (! dir[dir[0] == '.'])
+	return wds - 1;
+    }
+
+  wd[wds].name = dir;
+  wd[wds].saved = 0;
+  return wds++;
+}
+
+/* Change to directory I.  If I is 0, change to the initial working
+   directory; otherwise, I must be a value returned by chdir_arg.  */
+void
+chdir_do (int i)
+{
+  static int previous;
+
+  if (previous != i)
+    {
+      struct wd *prev = &wd[previous];
+      struct wd *curr = &wd[i];
+
+      if (! prev->saved)
+	{
+	  prev->saved = 1;
+	  if (save_cwd (&prev->saved_cwd) != 0)
+	    FATAL_ERROR ((0, 0, _("Cannot save working directory")));
+	}
+
+      if (curr->saved)
+	{
+	  if (restore_cwd (&curr->saved_cwd))
+	    FATAL_ERROR ((0, 0, _("Cannot change working directory")));
+	}
+      else
+	{
+	  if (i && ! ISSLASH (curr->name[0]))
+	    chdir_do (i - 1);
+	  if (chdir (curr->name) != 0)
+	    chdir_fatal (curr->name);
+	}
+
+      previous = i;
+    }
+}
+
+/* Decode MODE from its binary form in a stat structure, and encode it
+   into a 9-byte string STRING, terminated with a NUL.  */
+
+void
+decode_mode (mode_t mode, char *string)
+{
+  *string++ = mode & S_IRUSR ? 'r' : '-';
+  *string++ = mode & S_IWUSR ? 'w' : '-';
+  *string++ = (mode & S_ISUID
+	       ? (mode & S_IXUSR ? 's' : 'S')
+	       : (mode & S_IXUSR ? 'x' : '-'));
+  *string++ = mode & S_IRGRP ? 'r' : '-';
+  *string++ = mode & S_IWGRP ? 'w' : '-';
+  *string++ = (mode & S_ISGID
+	       ? (mode & S_IXGRP ? 's' : 'S')
+	       : (mode & S_IXGRP ? 'x' : '-'));
+  *string++ = mode & S_IROTH ? 'r' : '-';
+  *string++ = mode & S_IWOTH ? 'w' : '-';
+  *string++ = (mode & S_ISVTX
+	       ? (mode & S_IXOTH ? 't' : 'T')
+	       : (mode & S_IXOTH ? 'x' : '-'));
+  *string = '\0';
+}
+
+/* Report an error associated with the system call CALL and the
+   optional name NAME.  */
+static void
+call_arg_error (char const *call, char const *name)
+{
+  int e = errno;
+  ERROR ((0, e, _("%s: Cannot %s"), quotearg_colon (name), call));
+}
+
+/* Report a fatal error associated with the system call CALL and
+   the optional file name NAME.  */
+static void
+call_arg_fatal (char const *call, char const *name)
+{
+  int e = errno;
+  FATAL_ERROR ((0, e, _("%s: Cannot %s"), quotearg_colon (name),  call));
+}
+
+/* Report a warning associated with the system call CALL and
+   the optional file name NAME.  */
+static void
+call_arg_warn (char const *call, char const *name)
+{
+  int e = errno;
+  WARN ((0, e, _("%s: Warning: Cannot %s"), quotearg_colon (name), call));
+}
+
+void
+chdir_fatal (char const *name)
+{
+  call_arg_fatal ("chdir", name);
+}
+
+void
+chmod_error_details (char const *name, mode_t mode)
+{
+  int e = errno;
+  char buf[10];
+  decode_mode (mode, buf);
+  ERROR ((0, e, _("%s: Cannot change mode to %s"),
+	  quotearg_colon (name), buf));
+}
+
+void
+chown_error_details (char const *name, uid_t uid, gid_t gid)
+{
+  int e = errno;
+  ERROR ((0, e, _("%s: Cannot change ownership to uid %lu, gid %lu"),
+	  quotearg_colon (name), (unsigned long) uid, (unsigned long) gid));
+}
+
+void
+close_error (char const *name)
+{
+  call_arg_error ("close", name);
+}
+
+void
+close_fatal (char const *name)
+{
+  call_arg_fatal ("close", name);
+}
+
+void
+close_warn (char const *name)
+{
+  call_arg_warn ("close", name);
+}
+
+void
+exec_fatal (char const *name)
+{
+  call_arg_fatal ("exec", name);
+}
+
+void
+link_error (char const *target, char const *source)
+{
+  int e = errno;
+  ERROR ((0, e, _("%s: Cannot hard link to %s"),
+	  quotearg_colon (source), quote_n (1, target)));
+}
+
+void
+mkdir_error (char const *name)
+{
+  call_arg_error ("mkdir", name);
+}
+
+void
+mkfifo_error (char const *name)
+{
+  call_arg_error ("mkfifo", name);
+}
+
+void
+mknod_error (char const *name)
+{
+  call_arg_error ("mknod", name);
+}
+
+void
+open_error (char const *name)
+{
+  call_arg_error ("open", name);
+}
+
+void
+open_fatal (char const *name)
+{
+  call_arg_fatal ("open", name);
+}
+
+void
+open_warn (char const *name)
+{
+  call_arg_warn ("open", name);
+}
+
+void
+read_error (char const *name)
+{
+  call_arg_error ("read", name);
+}
+
+void
+read_error_details (char const *name, off_t offset, size_t size)
+{
+  char buf[UINTMAX_STRSIZE_BOUND];
+  int e = errno;
+  ERROR ((0, e,
+	  _("%s: Read error at byte %s, reading %lu bytes"),
+	  quotearg_colon (name), STRINGIFY_BIGINT (offset, buf),
+	  (unsigned long) size));
+}
+
+void
+read_warn_details (char const *name, off_t offset, size_t size)
+{
+  char buf[UINTMAX_STRSIZE_BOUND];
+  int e = errno;
+  WARN ((0, e,
+	 _("%s: Warning: Read error at byte %s, reading %lu bytes"),
+	 quotearg_colon (name), STRINGIFY_BIGINT (offset, buf),
+	 (unsigned long) size));
+}
+
+void
+read_fatal (char const *name)
+{
+  call_arg_fatal ("read", name);
+}
+
+void
+read_fatal_details (char const *name, off_t offset, size_t size)
+{
+  char buf[UINTMAX_STRSIZE_BOUND];
+  int e = errno;
+  FATAL_ERROR ((0, e,
+		_("%s: Read error at byte %s, reading %lu bytes"),
+		quotearg_colon (name), STRINGIFY_BIGINT (offset, buf),
+		(unsigned long) size));
+}
+
+void
+readlink_error (char const *name)
+{
+  call_arg_error ("readlink", name);
+}
+
+void
+readlink_warn (char const *name)
+{
+  call_arg_warn ("readlink", name);
+}
+
+void
+savedir_error (char const *name)
+{
+  call_arg_error ("savedir", name);
+}
+
+void
+savedir_warn (char const *name)
+{
+  call_arg_warn ("savedir", name);
+}
+
+void
+seek_error (char const *name)
+{
+  call_arg_error ("seek", name);
+}
+
+void
+seek_error_details (char const *name, off_t offset)
+{
+  char buf[UINTMAX_STRSIZE_BOUND];
+  int e = errno;
+  ERROR ((0, e, _("%s: Cannot seek to %s"),
+	  quotearg_colon (name),
+	  STRINGIFY_BIGINT (offset, buf)));
+}
+
+void
+seek_warn (char const *name)
+{
+  call_arg_warn ("seek", name);
+}
+
+void
+seek_warn_details (char const *name, off_t offset)
+{
+  char buf[UINTMAX_STRSIZE_BOUND];
+  int e = errno;
+  WARN ((0, e, _("%s: Warning: Cannot seek to %s"),
+	 quotearg_colon (name),
+	 STRINGIFY_BIGINT (offset, buf)));
+}
+
+void
+symlink_error (char const *contents, char const *name)
+{
+  int e = errno;
+  ERROR ((0, e, _("%s: Cannot create symlink to %s"),
+	  quotearg_colon (name), quote_n (1, contents)));
+}
+
+void
+stat_error (char const *name)
+{
+  call_arg_error ("stat", name);
+}
+
+void
+stat_warn (char const *name)
+{
+  call_arg_warn ("stat", name);
+}
+
+void
+truncate_error (char const *name)
+{
+  call_arg_error ("truncate", name);
+}
+
+void
+truncate_warn (char const *name)
+{
+  call_arg_warn ("truncate", name);
+}
+
+void
+unlink_error (char const *name)
+{
+  call_arg_error ("unlink", name);
+}
+
+void
+utime_error (char const *name)
+{
+  call_arg_error ("utime", name);
+}
+
+void
+waitpid_error (char const *name)
+{
+  call_arg_error ("waitpid", name);
+}
+
+void
+write_error (char const *name)
+{
+  call_arg_error ("write", name);
+}
+
+void
+write_error_details (char const *name, ssize_t status, size_t size)
+{
+  if (status < 0)
+    write_error (name);
+  else
+    ERROR ((0, 0, _("%s: Wrote only %lu of %lu bytes"),
+	    name, (unsigned long) status, (unsigned long) record_size));
+}
+
+void
+write_fatal (char const *name)
+{
+  call_arg_fatal ("write", name);
+}
+
+void
+write_fatal_details (char const *name, ssize_t status, size_t size)
+{
+  write_error_details (name, status, size);
+  fatal_exit ();
+}
+
+
+/* Fork, aborting if unsuccessful.  */
+pid_t
+xfork (void)
+{
+  pid_t p = fork ();
+  if (p == (pid_t) -1)
+    call_arg_fatal ("fork", _("child process"));
+  return p;
+}
+
+/* Create a pipe, aborting if unsuccessful.  */
+void
+xpipe (int fd[2])
+{
+  if (pipe (fd) < 0)
+    call_arg_fatal ("pipe", _("interprocess channel"));
+}
+
+/* Return an unambiguous printable representation, allocated in slot N,
+   for NAME, suitable for diagnostics.  */
+char const *
+quote_n (int n, char const *name)
+{
+  return quotearg_n_style (n, locale_quoting_style, name);
+}
+
+/* Return an unambiguous printable representation of NAME, suitable
+   for diagnostics.  */
+char const *
+quote (char const *name)
+{
+  return quote_n (0, name);
+}