/* Miscellaneous functions, not really specific to GNU tar.
Copyright (C) 1988, 1992, 1994, 1995, 1996, 1997, 1999, 2000, 2001,
- 2003, 2004, 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
+ 2003, 2004, 2005, 2006, 2007, 2009, 2010 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
#include <save-cwd.h>
#include <xgetcwd.h>
#include <unlinkdir.h>
-#include <utimens.h>
-
-#if HAVE_STROPTS_H
-# include <stropts.h>
-#endif
-#if HAVE_SYS_FILIO_H
-# include <sys/filio.h>
-#endif
#ifndef DOUBLE_SLASH_IS_DISTINCT_ROOT
# define DOUBLE_SLASH_IS_DISTINCT_ROOT 0
*string = value ? xstrdup (value) : 0;
}
+#if 0
+/* This function is currently unused; perhaps it should be removed? */
+
/* 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
when reading directory files. This means that we can't use
quotearg, as quotearg is locale-dependent and is meant for human
consumption. */
-char *
+static char *
quote_copy_string (const char *string)
{
const char *source = string;
}
return 0;
}
+#endif
/* 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
return name;
}
-/* Normalize NAME by resolving any relative references and
- removing trailing slashes. Destructive version: modifies its argument. */
-static int
-normalize_filename_x (char *name)
-{
- char *p, *q;
-
- p = name;
- if (DOUBLE_SLASH_IS_DISTINCT_ROOT && ISSLASH (*p))
- p++;
-
- /* Remove /./, resolve /../ and compress sequences of slashes */
- for (q = p; *q; )
+/* Normalize FILE_NAME by removing redundant slashes and "."
+ components, including redundant trailing slashes. Leave ".."
+ alone, as it may be significant in the presence of symlinks and on
+ platforms where "/.." != "/". Destructive version: modifies its
+ argument. */
+static void
+normalize_filename_x (char *file_name)
+{
+ char *name = file_name + FILE_SYSTEM_PREFIX_LEN (file_name);
+ char *p;
+ char const *q;
+ char c;
+
+ /* Don't squeeze leading "//" to "/", on hosts where they're distinct. */
+ name += (DOUBLE_SLASH_IS_DISTINCT_ROOT
+ && ISSLASH (*name) && ISSLASH (name[1]) && ! ISSLASH (name[2]));
+
+ /* Omit redundant leading "." components. */
+ for (q = p = name; (*p = *q) == '.' && ISSLASH (q[1]); p += !*q)
+ for (q += 2; ISSLASH (*q); q++)
+ continue;
+
+ /* Copy components from Q to P, omitting redundant slashes and
+ internal "." components. */
+ while ((*p++ = c = *q++) != '\0')
+ if (ISSLASH (c))
+ while (ISSLASH (q[*q == '.']))
+ q += (*q == '.') + 1;
+
+ /* Omit redundant trailing "." component and slash. */
+ if (2 < p - name)
{
- if (ISSLASH (*q))
- {
- *p++ = *q++;
- while (ISSLASH (*q))
- q++;
- continue;
- }
- else if (p == name)
- {
- if (*q == '.')
- {
- if (ISSLASH (q[1]))
- {
- q += 2;
- continue;
- }
- if (q[1] == '.' && ISSLASH (q[2]))
- return 1;
- }
- }
- else
- {
- if (*q == '.' && ISSLASH (p[-1]))
- {
- if (ISSLASH (q[1]))
- {
- q += 2;
- while (ISSLASH (*q))
- q++;
- continue;
- }
- else if (q[1] == '.' && ISSLASH (q[2]))
- {
- do
- {
- --p;
- }
- while (p > name && !ISSLASH (p[-1]));
- q += 3;
- continue;
- }
- }
- }
- *p++ = *q++;
+ p -= p[-2] == '.' && ISSLASH (p[-3]);
+ p -= 2 < p - name && ISSLASH (p[-2]);
+ p[-1] = '\0';
}
-
- /* Remove trailing slashes */
- while (p - 1 > name && ISSLASH (p[-1]))
- p--;
-
- *p = 0;
- return 0;
}
-/* Normalize NAME by resolving any relative references, removing trailing
- slashes, and converting it to absolute file name. Return the normalized
- name, or NULL in case of error. */
+/* Normalize NAME by removing redundant slashes and "." components,
+ including redundant trailing slashes. Return a normalized
+ newly-allocated copy. */
char *
normalize_filename (const char *name)
{
- char *copy;
+ char *copy = NULL;
- if (name[0] != '/')
+ if (IS_RELATIVE_FILE_NAME (name))
{
- copy = xgetcwd ();
- copy = xrealloc (copy, strlen (copy) + strlen (name) + 2);
+ /* Set COPY to the absolute file name if possible.
- strcat (copy, "/");
- strcat (copy, name);
+ FIXME: There should be no need to get the absolute file name.
+ getcwd is slow, it might fail, and it does not necessarily
+ return a canonical name even when it succeeds. Perhaps we
+ can use dev+ino pairs instead of names? */
+ copy = xgetcwd ();
+ if (copy)
+ {
+ size_t copylen = strlen (copy);
+ bool need_separator = ! (DOUBLE_SLASH_IS_DISTINCT_ROOT
+ && copylen == 2 && ISSLASH (copy[1]));
+ copy = xrealloc (copy, copylen + need_separator + strlen (name) + 1);
+ copy[copylen] = DIRECTORY_SEPARATOR;
+ strcpy (copy + copylen + need_separator, name);
+ }
+ else
+ WARN ((0, errno, _("Cannot get working directory")));
}
- else
+
+ if (! copy)
copy = xstrdup (name);
- if (normalize_filename_x (copy))
- {
- free (copy);
- return NULL;
- }
- return xrealloc (copy, strlen (copy) + 1);
+ normalize_filename_x (copy);
+ return copy;
}
\f
static char *after_backup_name;
/* Return 1 if FILE_NAME is obviously "." or "/". */
-static bool
+bool
must_be_dot_or_slash (char const *file_name)
{
file_name += FILE_SYSTEM_PREFIX_LEN (file_name);
return deref ? stat (name, buf) : lstat (name, buf);
}
-/* Set FD's (i.e., FILE's) access time to TIMESPEC[0]. If that's not
- possible to do by itself, set its access and data modification
- times to TIMESPEC[0] and TIMESPEC[1], respectively. */
+/* Set FD's (i.e., assuming the working directory is PARENTFD, FILE's)
+ access time to ATIME. ATFLAG controls symbolic-link following, in
+ the style of openat. */
int
-set_file_atime (int fd, char const *file, struct timespec const timespec[2])
+set_file_atime (int fd, int parentfd, char const *file, struct timespec atime,
+ int atflag)
{
-#ifdef _FIOSATIME
- if (0 <= fd)
- {
- struct timeval timeval;
- timeval.tv_sec = timespec[0].tv_sec;
- timeval.tv_usec = timespec[0].tv_nsec / 1000;
- if (ioctl (fd, _FIOSATIME, &timeval) == 0)
- return 0;
- }
-#endif
-
- return gl_futimens (fd, file, timespec);
+ struct timespec ts[2];
+ ts[0] = atime;
+ ts[1].tv_nsec = UTIME_OMIT;
+ return fdutimensat (fd, parentfd, file, ts, atflag);
}
/* A description of a working directory. */
struct wd
{
+ /* The directory's name. */
char const *name;
- int saved;
+
+ /* A negative value if no attempt has been made to save the
+ directory, 0 if it was saved successfully, and a positive errno
+ value if it was not saved successfully. */
+ int err;
+
+ /* The saved version of the directory, if ERR == 0. */
struct saved_cwd saved_cwd;
};
if (! wd_count)
{
wd[wd_count].name = ".";
- wd[wd_count].saved = 0;
+ wd[wd_count].err = -1;
wd_count++;
}
}
}
wd[wd_count].name = dir;
- wd[wd_count].saved = 0;
+ wd[wd_count].err = -1;
return wd_count++;
}
+/* Index of current directory. */
+int chdir_current;
+
/* 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)
+ if (chdir_current != i)
{
- struct wd *prev = &wd[previous];
+ struct wd *prev = &wd[chdir_current];
struct wd *curr = &wd[i];
- if (! prev->saved)
+ if (prev->err < 0)
{
- int err = 0;
- prev->saved = 1;
+ prev->err = 0;
if (save_cwd (&prev->saved_cwd) != 0)
- err = errno;
+ prev->err = errno;
else if (0 <= prev->saved_cwd.desc)
{
/* Make sure we still have at least one descriptor available. */
close (fd1);
prev->saved_cwd.desc = -1;
prev->saved_cwd.name = xgetcwd ();
+ if (! prev->saved_cwd.name)
+ prev->err = errno;
}
else
- err = errno;
+ prev->err = errno;
}
-
- if (err)
- FATAL_ERROR ((0, err, _("Cannot save working directory")));
}
- if (curr->saved)
+ if (0 <= curr->err)
{
- if (restore_cwd (&curr->saved_cwd))
- FATAL_ERROR ((0, 0, _("Cannot change working directory")));
+ int err = curr->err;
+ if (err == 0 && restore_cwd (&curr->saved_cwd) != 0)
+ err = errno;
+ if (err)
+ FATAL_ERROR ((0, err, _("Cannot restore working directory")));
}
else
{
chdir_fatal (curr->name);
}
- previous = i;
+ chdir_current = i;
}
}
\f
projects / chaz / tar / blobdiff