+ errno = ENOENT;
+ return -1;
+ }
+ if (*src_base == '.')
+ {
+ size_t len = base_len (src_base);
+ if (len == 1 || (len == 2 && src_base[1] == '.'))
+ {
+ errno = EINVAL;
+ return -1;
+ }
+ }
+ if (*dst_base == '.')
+ {
+ size_t len = base_len (dst_base);
+ if (len == 1 || (len == 2 && dst_base[1] == '.'))
+ {
+ errno = EINVAL;
+ return -1;
+ }
+ }
+
+ /* Presence of a trailing slash requires directory semantics. If
+ the source does not exist, or if the destination cannot be turned
+ into a directory, give up now. Otherwise, strip trailing slashes
+ before calling rename. There are no symlinks on mingw, so stat
+ works instead of lstat. */
+ src_slash = ISSLASH (src[src_len - 1]);
+ dst_slash = ISSLASH (dst[dst_len - 1]);
+ if (stat (src, &src_st))
+ return -1;
+ if (stat (dst, &dst_st))
+ {
+ if (errno != ENOENT || (!S_ISDIR (src_st.st_mode) && dst_slash))
+ return -1;
+ dst_exists = false;
+ }
+ else
+ {
+ if (S_ISDIR (dst_st.st_mode) != S_ISDIR (src_st.st_mode))
+ {
+ errno = S_ISDIR (dst_st.st_mode) ? EISDIR : ENOTDIR;
+ return -1;
+ }
+ dst_exists = true;
+ }
+
+ /* There are no symlinks, so if a file existed with a trailing
+ slash, it must be a directory, and we don't have to worry about
+ stripping strip trailing slash. However, mingw refuses to
+ replace an existing empty directory, so we have to help it out.
+ And canonicalize_file_name is not yet ported to mingw; however,
+ for directories, getcwd works as a viable alternative. Ensure
+ that we can get back to where we started before using it; later
+ attempts to return are fatal. Note that we can end up losing a
+ directory if rename then fails, but it was empty, so not much
+ damage was done. */
+ if (dst_exists && S_ISDIR (dst_st.st_mode))
+ {
+ char *cwd = getcwd (NULL, 0);
+ char *src_temp;
+ char *dst_temp;
+ if (!cwd || chdir (cwd))
+ return -1;
+ if (IS_ABSOLUTE_FILE_NAME (src))
+ {
+ dst_temp = chdir (dst) ? NULL : getcwd (NULL, 0);
+ src_temp = chdir (src) ? NULL : getcwd (NULL, 0);
+ }
+ else
+ {
+ src_temp = chdir (src) ? NULL : getcwd (NULL, 0);
+ if (!IS_ABSOLUTE_FILE_NAME (dst) && chdir (cwd))
+ abort ();
+ dst_temp = chdir (dst) ? NULL : getcwd (NULL, 0);
+ }
+ if (chdir (cwd))
+ abort ();
+ free (cwd);
+ if (!src_temp || !dst_temp)
+ {
+ free (src_temp);
+ free (dst_temp);
+ errno = ENOMEM;
+ return -1;
+ }
+ src_len = strlen (src_temp);
+ if (strncmp (src_temp, dst_temp, src_len) == 0
+ && (ISSLASH (dst_temp[src_len]) || dst_temp[src_len] == '\0'))
+ {
+ error = dst_temp[src_len];
+ free (src_temp);
+ free (dst_temp);
+ if (error)
+ {
+ errno = EINVAL;
+ return -1;
+ }
+ return 0;
+ }
+ if (rmdir (dst))
+ {
+ error = errno;
+ free (src_temp);
+ free (dst_temp);
+ errno = error;
+ return -1;
+ }
+ free (src_temp);
+ free (dst_temp);
+ }
+
+ /* MoveFileEx works if SRC is a directory without any flags, but
+ fails with MOVEFILE_REPLACE_EXISTING, so try without flags first.
+ Thankfully, MoveFileEx handles hard links correctly, even though
+ rename() does not. */
+ if (MoveFileEx (src, dst, 0))
+ return 0;
+
+ /* Retry with MOVEFILE_REPLACE_EXISTING if the move failed
+ due to the destination already existing. */
+ error = GetLastError ();
+ if (error == ERROR_FILE_EXISTS || error == ERROR_ALREADY_EXISTS)
+ {
+ if (MoveFileEx (src, dst, MOVEFILE_REPLACE_EXISTING))
+ return 0;
+
+ error = GetLastError ();
+ }
+
+ switch (error)
+ {
+ case ERROR_FILE_NOT_FOUND:
+ case ERROR_PATH_NOT_FOUND:
+ case ERROR_BAD_PATHNAME:
+ case ERROR_DIRECTORY:
+ errno = ENOENT;
+ break;
+
+ case ERROR_ACCESS_DENIED:
+ case ERROR_SHARING_VIOLATION:
+ errno = EACCES;
+ break;
+
+ case ERROR_OUTOFMEMORY:
+ errno = ENOMEM;
+ break;
+
+ case ERROR_CURRENT_DIRECTORY:
+ errno = EBUSY;
+ break;
+
+ case ERROR_NOT_SAME_DEVICE:
+ errno = EXDEV;
+ break;
+
+ case ERROR_WRITE_PROTECT:
+ errno = EROFS;
+ break;
+
+ case ERROR_WRITE_FAULT:
+ case ERROR_READ_FAULT:
+ case ERROR_GEN_FAILURE:
+ errno = EIO;
+ break;
+
+ case ERROR_HANDLE_DISK_FULL:
+ case ERROR_DISK_FULL:
+ case ERROR_DISK_TOO_FRAGMENTED:
+ errno = ENOSPC;
+ break;
+
+ case ERROR_FILE_EXISTS:
+ case ERROR_ALREADY_EXISTS:
+ errno = EEXIST;
+ break;
+
+ case ERROR_BUFFER_OVERFLOW:
+ case ERROR_FILENAME_EXCED_RANGE:
+ errno = ENAMETOOLONG;
+ break;
+
+ case ERROR_INVALID_NAME:
+ case ERROR_DELETE_PENDING:
+ errno = EPERM; /* ? */
+ break;
+
+# ifndef ERROR_FILE_TOO_LARGE
+/* This value is documented but not defined in all versions of windows.h. */
+# define ERROR_FILE_TOO_LARGE 223
+# endif
+ case ERROR_FILE_TOO_LARGE:
+ errno = EFBIG;
+ break;
+
+ default:
+ errno = EINVAL;
+ break;
+ }
+
+ return -1;
+}
+
+#else /* ! W32 platform */
+
+# include <errno.h>
+# include <stdio.h>
+# include <stdlib.h>
+# include <string.h>
+# include <sys/stat.h>
+# include <unistd.h>
+
+# include "dirname.h"
+# include "same-inode.h"
+
+/* Rename the file SRC to DST, fixing any trailing slash bugs. */
+
+int
+rpl_rename (char const *src, char const *dst)
+{
+ size_t src_len = strlen (src);
+ size_t dst_len = strlen (dst);
+ char *src_temp = (char *) src;
+ char *dst_temp = (char *) dst;
+ bool src_slash;
+ bool dst_slash;
+ bool dst_exists;
+ int ret_val = -1;
+ int rename_errno = ENOTDIR;
+ struct stat src_st;
+ struct stat dst_st;
+
+ if (!src_len || !dst_len)
+ return rename (src, dst); /* Let strace see the ENOENT failure. */
+
+# if RENAME_DEST_EXISTS_BUG
+ {
+ char *src_base = last_component (src);
+ char *dst_base = last_component (dst);
+ if (*src_base == '.')
+ {
+ size_t len = base_len (src_base);
+ if (len == 1 || (len == 2 && src_base[1] == '.'))
+ {
+ errno = EINVAL;
+ return -1;
+ }
+ }
+ if (*dst_base == '.')
+ {
+ size_t len = base_len (dst_base);
+ if (len == 1 || (len == 2 && dst_base[1] == '.'))
+ {
+ errno = EINVAL;
+ return -1;
+ }
+ }
+ }
+# endif /* RENAME_DEST_EXISTS_BUG */
+
+ src_slash = src[src_len - 1] == '/';
+ dst_slash = dst[dst_len - 1] == '/';
+
+# if !RENAME_HARD_LINK_BUG && !RENAME_DEST_EXISTS_BUG
+ /* If there are no trailing slashes, then trust the native
+ implementation unless we also suspect issues with hard link
+ detection or file/directory conflicts. */
+ if (!src_slash && !dst_slash)
+ return rename (src, dst);
+# endif /* !RENAME_HARD_LINK_BUG && !RENAME_DEST_EXISTS_BUG */
+
+ /* Presence of a trailing slash requires directory semantics. If
+ the source does not exist, or if the destination cannot be turned
+ into a directory, give up now. Otherwise, strip trailing slashes
+ before calling rename. */
+ if (lstat (src, &src_st))
+ return -1;
+ if (lstat (dst, &dst_st))
+ {
+ if (errno != ENOENT || (!S_ISDIR (src_st.st_mode) && dst_slash))
+ return -1;
+ dst_exists = false;