+++ /dev/null
-/* -*- buffer-read-only: t -*- vi: set ro: */
-/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
-/* Return the canonical absolute name of a given file.
- Copyright (C) 1996-2010 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 Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-#include <config.h>
-
-#include "canonicalize.h"
-
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#include "areadlink.h"
-#include "file-set.h"
-#include "hash-triple.h"
-#include "pathmax.h"
-#include "xalloc.h"
-#include "xgetcwd.h"
-
-#ifndef DOUBLE_SLASH_IS_DISTINCT_ROOT
-# define DOUBLE_SLASH_IS_DISTINCT_ROOT 0
-#endif
-
-#if !((HAVE_CANONICALIZE_FILE_NAME && FUNC_REALPATH_WORKS) \
- || GNULIB_CANONICALIZE_LGPL)
-/* Return the canonical absolute name of file NAME. A canonical name
- does not contain any `.', `..' components nor any repeated file name
- separators ('/') or symlinks. All components must exist.
- The result is malloc'd. */
-
-char *
-canonicalize_file_name (const char *name)
-{
- return canonicalize_filename_mode (name, CAN_EXISTING);
-}
-#endif /* !HAVE_CANONICALIZE_FILE_NAME */
-
-/* Return true if we've already seen the triple, <FILENAME, dev, ino>.
- If *HT is not initialized, initialize it. */
-static bool
-seen_triple (Hash_table **ht, char const *filename, struct stat const *st)
-{
- if (*ht == NULL)
- {
- size_t initial_capacity = 7;
- *ht = hash_initialize (initial_capacity,
- NULL,
- triple_hash,
- triple_compare_ino_str,
- triple_free);
- if (*ht == NULL)
- xalloc_die ();
- }
-
- if (seen_file (*ht, filename, st))
- return true;
-
- record_file (*ht, filename, st);
- return false;
-}
-
-/* Return the canonical absolute name of file NAME, while treating
- missing elements according to CAN_MODE. A canonical name
- does not contain any `.', `..' components nor any repeated file name
- separators ('/') or symlinks. Whether components must exist
- or not depends on canonicalize mode. The result is malloc'd. */
-
-char *
-canonicalize_filename_mode (const char *name, canonicalize_mode_t can_mode)
-{
- char *rname, *dest, *extra_buf = NULL;
- char const *start;
- char const *end;
- char const *rname_limit;
- size_t extra_len = 0;
- Hash_table *ht = NULL;
- int saved_errno;
-
- if (name == NULL)
- {
- errno = EINVAL;
- return NULL;
- }
-
- if (name[0] == '\0')
- {
- errno = ENOENT;
- return NULL;
- }
-
- if (name[0] != '/')
- {
- rname = xgetcwd ();
- if (!rname)
- return NULL;
- dest = strchr (rname, '\0');
- if (dest - rname < PATH_MAX)
- {
- char *p = xrealloc (rname, PATH_MAX);
- dest = p + (dest - rname);
- rname = p;
- rname_limit = rname + PATH_MAX;
- }
- else
- {
- rname_limit = dest;
- }
- }
- else
- {
- rname = xmalloc (PATH_MAX);
- rname_limit = rname + PATH_MAX;
- rname[0] = '/';
- dest = rname + 1;
- if (DOUBLE_SLASH_IS_DISTINCT_ROOT && name[1] == '/')
- *dest++ = '/';
- }
-
- for (start = name; *start; start = end)
- {
- /* Skip sequence of multiple file name separators. */
- while (*start == '/')
- ++start;
-
- /* Find end of component. */
- for (end = start; *end && *end != '/'; ++end)
- /* Nothing. */;
-
- if (end - start == 0)
- break;
- else if (end - start == 1 && start[0] == '.')
- /* nothing */;
- else if (end - start == 2 && start[0] == '.' && start[1] == '.')
- {
- /* Back up to previous component, ignore if at root already. */
- if (dest > rname + 1)
- while ((--dest)[-1] != '/');
- if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rname + 1
- && *dest == '/')
- dest++;
- }
- else
- {
- struct stat st;
-
- if (dest[-1] != '/')
- *dest++ = '/';
-
- if (dest + (end - start) >= rname_limit)
- {
- ptrdiff_t dest_offset = dest - rname;
- size_t new_size = rname_limit - rname;
-
- if (end - start + 1 > PATH_MAX)
- new_size += end - start + 1;
- else
- new_size += PATH_MAX;
- rname = xrealloc (rname, new_size);
- rname_limit = rname + new_size;
-
- dest = rname + dest_offset;
- }
-
- dest = memcpy (dest, start, end - start);
- dest += end - start;
- *dest = '\0';
-
- if (lstat (rname, &st) != 0)
- {
- saved_errno = errno;
- if (can_mode == CAN_EXISTING)
- goto error;
- if (can_mode == CAN_ALL_BUT_LAST)
- {
- if (end[strspn (end, "/")] || saved_errno != ENOENT)
- goto error;
- continue;
- }
- st.st_mode = 0;
- }
-
- if (S_ISLNK (st.st_mode))
- {
- char *buf;
- size_t n, len;
-
- /* Detect loops. We cannot use the cycle-check module here,
- since it's actually possible to encounter the same symlink
- more than once in a given traversal. However, encountering
- the same symlink,NAME pair twice does indicate a loop. */
- if (seen_triple (&ht, name, &st))
- {
- if (can_mode == CAN_MISSING)
- continue;
- saved_errno = ELOOP;
- goto error;
- }
-
- buf = areadlink_with_size (rname, st.st_size);
- if (!buf)
- {
- if (can_mode == CAN_MISSING && errno != ENOMEM)
- continue;
- saved_errno = errno;
- goto error;
- }
-
- n = strlen (buf);
- len = strlen (end);
-
- if (!extra_len)
- {
- extra_len =
- ((n + len + 1) > PATH_MAX) ? (n + len + 1) : PATH_MAX;
- extra_buf = xmalloc (extra_len);
- }
- else if ((n + len + 1) > extra_len)
- {
- extra_len = n + len + 1;
- extra_buf = xrealloc (extra_buf, extra_len);
- }
-
- /* Careful here, end may be a pointer into extra_buf... */
- memmove (&extra_buf[n], end, len + 1);
- name = end = memcpy (extra_buf, buf, n);
-
- if (buf[0] == '/')
- {
- dest = rname + 1; /* It's an absolute symlink */
- if (DOUBLE_SLASH_IS_DISTINCT_ROOT && buf[1] == '/')
- *dest++ = '/';
- }
- else
- {
- /* Back up to previous component, ignore if at root
- already: */
- if (dest > rname + 1)
- while ((--dest)[-1] != '/');
- if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rname + 1
- && *dest == '/')
- dest++;
- }
-
- free (buf);
- }
- else
- {
- if (!S_ISDIR (st.st_mode) && *end && (can_mode != CAN_MISSING))
- {
- saved_errno = ENOTDIR;
- goto error;
- }
- }
- }
- }
- if (dest > rname + 1 && dest[-1] == '/')
- --dest;
- if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rname + 1 && *dest == '/')
- dest++;
- *dest = '\0';
- if (rname_limit != dest + 1)
- rname = xrealloc (rname, dest - rname + 1);
-
- free (extra_buf);
- if (ht)
- hash_free (ht);
- return rname;
-
-error:
- free (extra_buf);
- free (rname);
- if (ht)
- hash_free (ht);
- errno = saved_errno;
- return NULL;
-}
projects / tar / blobdiff