# include <config.h>
#endif
+#include <stdbool.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
# include <strings.h>
#endif
+#include <limits.h>
+#ifndef _POSIX_NAME_MAX
+# define _POSIX_NAME_MAX 14
+#endif
+
#include "same.h"
#include "dirname.h"
#include "error.h"
void free ();
#endif
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+
#define SAME_INODE(Stat_buf_1, Stat_buf_2) \
((Stat_buf_1).st_ino == (Stat_buf_2).st_ino \
&& (Stat_buf_1).st_dev == (Stat_buf_2).st_dev)
char const *dest_basename = base_name (dest);
size_t source_baselen = base_len (source_basename);
size_t dest_baselen = base_len (dest_basename);
+ bool identical_basenames =
+ (source_baselen == dest_baselen
+ && memcmp (source_basename, dest_basename, dest_baselen) == 0);
+ bool compare_dirs = identical_basenames;
+ bool same = false;
+
+#if ! _POSIX_NO_TRUNC && HAVE_PATHCONF && defined _PC_NAME_MAX
+ /* This implementation silently truncates pathname components. If
+ the base names might be truncated, check whether the truncated
+ base names are the same, while checking the directories. */
+ size_t slen_max = HAVE_LONG_FILE_NAMES ? 255 : _POSIX_NAME_MAX;
+ size_t min_baselen = MIN (source_baselen, dest_baselen);
+ if (slen_max <= min_baselen
+ && memcmp (source_basename, dest_basename, slen_max) == 0)
+ compare_dirs = true;
+#endif
- if (source_baselen == dest_baselen
- && memcmp (source_basename, dest_basename, dest_baselen) == 0)
+ if (compare_dirs)
{
struct stat source_dir_stats;
struct stat dest_dir_stats;
error (1, errno, "%s", dest_dirname);
}
+ same = SAME_INODE (source_dir_stats, dest_dir_stats);
+
+#if ! _POSIX_NO_TRUNC && HAVE_PATHCONF && defined _PC_NAME_MAX
+ if (same && ! identical_basenames)
+ {
+ long name_max = (errno = 0, pathconf (source_dirname, _PC_NAME_MAX));
+ if (name_max < 0)
+ {
+ if (errno)
+ {
+ /* Shouldn't happen. */
+ error (1, errno, "%s", source_dirname);
+ }
+ same = false;
+ }
+ else
+ same = (name_max <= min_baselen
+ && memcmp (source_basename, dest_basename, name_max) == 0);
+ }
+#endif
+
free (source_dirname);
free (dest_dirname);
-
- if (SAME_INODE (source_dir_stats, dest_dir_stats))
- return 1;
}
- return 0;
+ return same;
}