--- /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;
+}
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