Assume POSIX 1003.1-1988 or later for unistd.h.

* admin/CPP-DEFINES (BROKEN_GETWD, HAVE_GETCWD, HAVE_GETWD, HAVE_SIZE_T)
(HAVE_UNISTD_H): Remove.
* configure.ac: Do not check for getcwd or getwd.
* lib-src/emacsclient.c (getcwd): Remove decl.
(get_current_dir_name): Assume getcwd exists.
* lib-src/etags.c (HAVE_GETCWD): Remove.
(getcwd): Remove decl.
(NO_LONG_OPTIONS): Remove this.  All uses removed.
Emacs always has GNU getopt.
(etags_getcwd): Assume getcwd exists.
* lib-src/movemail.c (F_OK, X_OK, W_OK, R_OK): Remove.
* nt/config.nt (HAVE_GETCWD): Remove.
* src/alloc.c: Assume unistd.h exists.
* src/fileio.c (Fexpand_file_name) [DOS_NT]: Use getcwd, not getwd.
* src/sysdep.c (get_current_dir_name): Assume getcwd exists.
(getwd) [USG]: Remove; no longer needed.
(sys_subshell) [DOS_NT]: Use getcwd, not getwd.
* src/w32.c (getcwd): Rename from getwd, and switch to getcwd's API.
* src/w32.h (getcwd): Remove decl.

Fixes: debbugs:12945

16 files changed, 67 insertions, 193 deletions

diff --git a/ChangeLog b/ChangeLog
index 33dafaaea4c..4dad9a171dc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-11-21  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Assume POSIX 1003.1-1988 or later for unistd.h (Bug#12945).
+	* configure.ac: Do not check for getcwd or getwd.
+
 2012-11-21  Glenn Morris  <rgm@gnu.org>
 
 	* configure.ac (--enable-profiling): Doc fix.
diff --git a/admin/CPP-DEFINES b/admin/CPP-DEFINES
index ae8673452a3..5c291944766 100644
--- a/admin/CPP-DEFINES
+++ b/admin/CPP-DEFINES
@@ -86,7 +86,6 @@ anymore, so they can be removed.
 AMPERSAND_FULL_NAME
 BROKEN_DATAGRAM_SOCKETS
 BROKEN_FIONREAD
-BROKEN_GETWD
 BROKEN_GET_CURRENT_DIR_NAME
 BROKEN_NON_BLOCKING_CONNECT
 BROKEN_PTY_READ_AFTER_EAGAIN
@@ -161,7 +160,6 @@ HAVE_FUTIMESAT
 HAVE_GAI_STRERROR
 HAVE_GCONF
 HAVE_GETADDRINFO
-HAVE_GETCWD
 HAVE_GETDELIM
 HAVE_GETGRENT
 HAVE_GETHOSTNAME
@@ -178,7 +176,6 @@ HAVE_GETRLIMIT
 HAVE_GETRUSAGE
 HAVE_GETSOCKNAME
 HAVE_GETTIMEOFDAY
-HAVE_GETWD
 HAVE_GET_CURRENT_DIR_NAME
 HAVE_GHOSTSCRIPT
 HAVE_GIF
@@ -304,7 +301,6 @@ HAVE_SIGNED_SIG_ATOMIC_T
 HAVE_SIGNED_WCHAR_T
 HAVE_SIGNED_WINT_T
 HAVE_SIGSET_T
-HAVE_SIZE_T
 HAVE_SNPRINTF
 HAVE_SOCKETS
 HAVE_SOUND
@@ -369,7 +365,6 @@ HAVE_TM_ZONE
 HAVE_TOUCHLOCK
 HAVE_TZNAME
 HAVE_TZSET
-HAVE_UNISTD_H
 HAVE_UNSIGNED_LONG_LONG_INT
 HAVE_UTIL_H
 HAVE_UTIMENSAT
diff --git a/admin/ChangeLog b/admin/ChangeLog
index 3d76f9dd2ba..b256a0f5dc4 100644
--- a/admin/ChangeLog
+++ b/admin/ChangeLog
@@ -1,3 +1,9 @@
+2012-11-21  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Assume POSIX 1003.1-1988 or later for unistd.h (Bug#12945).
+	* CPP-DEFINES (BROKEN_GETWD, HAVE_GETCWD, HAVE_GETWD, HAVE_SIZE_T)
+	(HAVE_UNISTD_H): Remove.
+
 2012-11-17  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Assume POSIX 1003.1-1988 or later for fcntl.h (Bug#12881).
diff --git a/configure.ac b/configure.ac
index 343a9e7cfb5..25bf2b47cc9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2894,7 +2894,7 @@ AC_CHECK_FUNCS(gethostname \
 closedir getrusage get_current_dir_name \
 lrand48 \
 select getpagesize setlocale \
-utimes getrlimit setrlimit getcwd shutdown getaddrinfo \
+utimes getrlimit setrlimit shutdown getaddrinfo \
 strsignal setitimer \
 sendto recvfrom getsockname getpeername getifaddrs freeifaddrs \
 gai_strerror mkstemp getline getdelim fsync sync \
@@ -2903,14 +2903,6 @@ getpwent endpwent getgrent endgrent \
 touchlock \
 cfmakeraw cfsetspeed copysign __executable_start)
 
-dnl getwd appears to be buggy on SVR4.2, so we don't use it.
-if test $opsys = unixware; then
-  dnl In case some other test ends up checking for getwd.
-  AC_DEFINE(BROKEN_GETWD, 1, [Define if getwd should not be used.])
-else
-  AC_CHECK_FUNCS(getwd)
-fi
-
 ## Eric Backus <ericb@lsid.hp.com> says, HP-UX 9.x on HP 700 machines
 ## has a broken `rint' in some library versions including math library
 ## version number A.09.05.
diff --git a/lib-src/ChangeLog b/lib-src/ChangeLog
index 67035773977..8e835795e6a 100644
--- a/lib-src/ChangeLog
+++ b/lib-src/ChangeLog
@@ -1,3 +1,15 @@
+2012-11-21  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Assume POSIX 1003.1-1988 or later for unistd.h (Bug#12945).
+	* emacsclient.c (getcwd): Remove decl.
+	(get_current_dir_name): Assume getcwd exists.
+	* etags.c (HAVE_GETCWD): Remove.
+	(getcwd): Remove decl.
+	(NO_LONG_OPTIONS): Remove this.  All uses removed.
+	Emacs always has GNU getopt.
+	(etags_getcwd): Assume getcwd exists.
+	* movemail.c (F_OK, X_OK, W_OK, R_OK): Remove.
+
 2012-11-20  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* emacsclient.c (handle_sigcont, handle_sigtstp): Use raise (sig)
diff --git a/lib-src/emacsclient.c b/lib-src/emacsclient.c
index 78079b5cf69..021ac6eb247 100644
--- a/lib-src/emacsclient.c
+++ b/lib-src/emacsclient.c
@@ -88,10 +88,7 @@ char *w32_getenv (char *);
 
 
 
-char *getenv (const char *), *getwd (char *);
-#ifdef HAVE_GETCWD
-char *(getcwd) (char *, size_t);
-#endif
+char *getenv (const char *);
 
 #ifndef VERSION
 #define VERSION "unspecified"
@@ -223,7 +220,7 @@ get_current_dir_name (void)
   char *buf;
   const char *pwd;
   struct stat dotstat, pwdstat;
-  /* If PWD is accurate, use it instead of calling getwd.  PWD is
+  /* If PWD is accurate, use it instead of calling getcwd.  PWD is
      sometimes a nicer name, and using it may avoid a fatal error if a
      parent directory is searchable but not readable.  */
     if ((pwd = egetenv ("PWD")) != 0
@@ -240,7 +237,6 @@ get_current_dir_name (void)
       buf = (char *) xmalloc (strlen (pwd) + 1);
       strcpy (buf, pwd);
     }
-#ifdef HAVE_GETCWD
   else
     {
       size_t buf_size = 1024;
@@ -267,20 +263,6 @@ get_current_dir_name (void)
 	    }
         }
     }
-#else
-  else
-    {
-      /* We need MAXPATHLEN here.  */
-      buf = (char *) xmalloc (MAXPATHLEN + 1);
-      if (getwd (buf) == NULL)
-        {
-          int tmp_errno = errno;
-          free (buf);
-          errno = tmp_errno;
-          return NULL;
-        }
-    }
-#endif
   return buf;
 }
 #endif
@@ -1592,7 +1574,6 @@ main (int argc, char **argv)
   cwd = get_current_dir_name ();
   if (cwd == 0)
     {
-      /* getwd puts message in STRING if it fails.  */
       message (TRUE, "%s: %s\n", progname,
 	       "Cannot get current working directory");
       fail ();
diff --git a/lib-src/etags.c b/lib-src/etags.c
index ec415e9905f..b6af17b8edf 100644
--- a/lib-src/etags.c
+++ b/lib-src/etags.c
@@ -123,19 +123,9 @@ char pot_etags_version[] = "@(#) pot revision number is 17.38.1.4";
 # undef HAVE_NTGUI
 # undef  DOS_NT
 # define DOS_NT
-# ifndef HAVE_GETCWD
-#   define HAVE_GETCWD
-# endif /* undef HAVE_GETCWD */
-#else /* not WINDOWSNT */
-#endif /* !WINDOWSNT */
+#endif /* WINDOWSNT */
 
 #include <unistd.h>
-#ifndef HAVE_UNISTD_H
-# if defined (HAVE_GETCWD) && !defined (WINDOWSNT)
-    extern char *getcwd (char *buf, size_t size);
-# endif
-#endif /* HAVE_UNISTD_H */
-
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
@@ -152,16 +142,7 @@ char pot_etags_version[] = "@(#) pot revision number is 17.38.1.4";
 # define assert(x) ((void) 0)
 #endif
 
-#ifdef NO_LONG_OPTIONS		/* define this if you don't have GNU getopt */
-# define NO_LONG_OPTIONS TRUE
-# define getopt_long(argc,argv,optstr,lopts,lind) getopt (argc, argv, optstr)
-  extern char *optarg;
-  extern int optind, opterr;
-#else
-# define NO_LONG_OPTIONS FALSE
-# include <getopt.h>
-#endif /* NO_LONG_OPTIONS */
-
+#include <getopt.h>
 #include <regex.h>
 
 /* Define CTAGS to make the program "ctags" compatible with the usual one.
@@ -869,11 +850,7 @@ print_help (argument *argbuffer)
   printf ("Usage: %s [options] [[regex-option ...] file-name] ...\n\
 \n\
 These are the options accepted by %s.\n", progname, progname);
-  if (NO_LONG_OPTIONS)
-    puts ("WARNING: long option names do not work with this executable,\n\
-as it is not linked with GNU getopt.");
-  else
-    puts ("You may use unambiguous abbreviations for the long option names.");
+  puts ("You may use unambiguous abbreviations for the long option names.");
   puts ("  A - as file name means read names from stdin (one per line).\n\
 Absolute names are stored in the output file as they are.\n\
 Relative ones are stored relative to the output file's directory.\n");
@@ -1065,9 +1042,9 @@ main (int argc, char **argv)
 
   /* When the optstring begins with a '-' getopt_long does not rearrange the
      non-options arguments to be at the end, but leaves them alone. */
-  optstring = concat (NO_LONG_OPTIONS ? "" : "-",
-		      "ac:Cf:Il:o:r:RSVhH",
-		      (CTAGS) ? "BxdtTuvw" : "Di:");
+  optstring = concat ("-ac:Cf:Il:o:r:RSVhH",
+		      (CTAGS) ? "BxdtTuvw" : "Di:",
+		      "");
 
   while ((opt = getopt_long (argc, argv, optstring, longopts, NULL)) != EOF)
     switch (opt)
@@ -6333,8 +6310,8 @@ pfatal (const char *s1)
 static void
 suggest_asking_for_help (void)
 {
-  fprintf (stderr, "\tTry `%s %s' for a complete list of options.\n",
-	   progname, NO_LONG_OPTIONS ? "-h" : "--help");
+  fprintf (stderr, "\tTry `%s --help' for a complete list of options.\n",
+	   progname);
   exit (EXIT_FAILURE);
 }
 
@@ -6372,7 +6349,6 @@ concat (const char *s1, const char *s2, const char *s3)
 static char *
 etags_getcwd (void)
 {
-#ifdef HAVE_GETCWD
   int bufsize = 200;
   char *path = xnew (bufsize, char);
 
@@ -6387,34 +6363,6 @@ etags_getcwd (void)
 
   canonicalize_filename (path);
   return path;
-
-#else /* not HAVE_GETCWD */
-#if MSDOS
-
-  char *p, path[MAXPATHLEN + 1]; /* Fixed size is safe on MSDOS.  */
-
-  getwd (path);
-
-  for (p = path; *p != '\0'; p++)
-    if (*p == '\\')
-      *p = '/';
-    else
-      *p = lowcase (*p);
-
-  return strdup (path);
-#else /* not MSDOS */
-  linebuffer path;
-  FILE *pipe;
-
-  linebuffer_init (&path);
-  pipe = (FILE *) popen ("pwd 2>/dev/null", "r");
-  if (pipe == NULL || readline_internal (&path, pipe) == 0)
-    pfatal ("pwd");
-  pclose (pipe);
-
-  return path.buffer;
-#endif /* not MSDOS */
-#endif /* not HAVE_GETCWD */
 }
 
 /* Return a newly allocated string containing the file name of FILE
diff --git a/lib-src/movemail.c b/lib-src/movemail.c
index cd329a110a8..adc5dd96409 100644
--- a/lib-src/movemail.c
+++ b/lib-src/movemail.c
@@ -96,13 +96,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <fcntl.h>
 #endif /* WINDOWSNT */
 
-#ifndef F_OK
-#define F_OK 0
-#define X_OK 1
-#define W_OK 2
-#define R_OK 4
-#endif
-
 #ifdef WINDOWSNT
 #include <sys/locking.h>
 #endif
diff --git a/nt/ChangeLog b/nt/ChangeLog
index 0eda3a699d6..4fa3d04513c 100644
--- a/nt/ChangeLog
+++ b/nt/ChangeLog
@@ -1,3 +1,8 @@
+2012-11-21  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Assume POSIX 1003.1-1988 or later for unistd.h (Bug#12945).
+	* config.nt (HAVE_GETCWD): Remove.
+
 2012-11-21  Eli Zaretskii  <eliz@gnu.org>
 
 	* nmake.defs: Use !if, not !ifdef.  For the details, see
diff --git a/nt/config.nt b/nt/config.nt
index 57c18ad2789..1adcbca89be 100644
--- a/nt/config.nt
+++ b/nt/config.nt
@@ -411,12 +411,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 /* Define to 1 if you have the `getaddrinfo' function. */
 #undef HAVE_GETADDRINFO
 
-/* Define to 1 if you have the `getcwd' function.
-   If you think about defining HAVE_GETCWD, don't: the alternative
-   getwd is redefined on w32.c, and does not really return the current
-   directory, to get the desired results elsewhere in Emacs.  */
-#undef HAVE_GETCWD
-
 /* Define to 1 if you have the `getdelim' function. */
 #undef HAVE_GETDELIM
 
diff --git a/src/ChangeLog b/src/ChangeLog
index b1a76bfdae0..9e9ae468044 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,14 @@
+2012-11-21  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Assume POSIX 1003.1-1988 or later for unistd.h (Bug#12945).
+	* alloc.c: Assume unistd.h exists.
+	* fileio.c (Fexpand_file_name) [DOS_NT]: Use getcwd, not getwd.
+	* sysdep.c (get_current_dir_name): Assume getcwd exists.
+	(getwd) [USG]: Remove; no longer needed.
+	(sys_subshell) [DOS_NT]: Use getcwd, not getwd.
+	* w32.c (getcwd): Rename from getwd, and switch to getcwd's API.
+	* w32.h (getcwd): Remove decl.
+
 2012-11-21  Stefan Monnier  <monnier@iro.umontreal.ca>
 
 	* xdisp.c (fast_set_selected_frame): Rename from update_tool_bar_unwind.
diff --git a/src/alloc.c b/src/alloc.c
index 22e3db3cc77..46b2dde93a3 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -63,10 +63,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #endif
 
 #include <unistd.h>
-#ifndef HAVE_UNISTD_H
-extern void *sbrk ();
-#endif
-
 #include <fcntl.h>
 
 #ifdef USE_GTK
diff --git a/src/fileio.c b/src/fileio.c
index e1a7cf55e28..442c66550d3 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -1148,7 +1148,7 @@ filesystem tree, not (expand-file-name ".."  dirname).  */)
 		newdir = "/";
 	    }
 	  else
-	    getwd (adir);
+	    getcwd (adir, MAXPATHLEN + 1);
 	  newdir = adir;
 	}
 
diff --git a/src/sysdep.c b/src/sysdep.c
index 7c5c144fa8c..3dd19685540 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -101,7 +101,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #define _P_WAIT 0
 int _cdecl _spawnlp (int, const char *, const char *, ...);
 int _cdecl _getpid (void);
-extern char *getwd (char *);
 #endif
 
 #include "syssignal.h"
@@ -134,12 +133,12 @@ char*
 get_current_dir_name (void)
 {
   char *buf;
-  char *pwd;
+  char *pwd = getenv ("PWD");
   struct stat dotstat, pwdstat;
-  /* If PWD is accurate, use it instead of calling getwd.  PWD is
+  /* If PWD is accurate, use it instead of calling getcwd.  PWD is
      sometimes a nicer name, and using it may avoid a fatal error if a
      parent directory is searchable but not readable.  */
-    if ((pwd = getenv ("PWD")) != 0
+  if (pwd
       && (IS_DIRECTORY_SEP (*pwd) || (*pwd && IS_DEVICE_SEP (pwd[1])))
       && stat (pwd, &pwdstat) == 0
       && stat (".", &dotstat) == 0
@@ -155,7 +154,6 @@ get_current_dir_name (void)
         return NULL;
       strcpy (buf, pwd);
     }
-#ifdef HAVE_GETCWD
   else
     {
       size_t buf_size = 1024;
@@ -179,22 +177,6 @@ get_current_dir_name (void)
             return NULL;
         }
     }
-#else
-  else
-    {
-      /* We need MAXPATHLEN here.  */
-      buf = malloc (MAXPATHLEN + 1);
-      if (!buf)
-        return NULL;
-      if (getwd (buf) == NULL)
-        {
-          int tmp_errno = errno;
-          free (buf);
-          errno = tmp_errno;
-          return NULL;
-        }
-    }
-#endif
   return buf;
 }
 #endif
@@ -521,7 +503,7 @@ sys_subshell (void)
       const char *sh = 0;
 
 #ifdef DOS_NT    /* MW, Aug 1993 */
-      getwd (oldwd);
+      getcwd (oldwd, sizeof oldwd);
       if (sh == 0)
 	sh = (char *) egetenv ("SUSPEND");	/* KFS, 1994-12-14 */
 #endif
@@ -2238,60 +2220,6 @@ emacs_readlink (char const *filename, char initial_buf[READLINK_BUFSIZE])
 		       &emacs_norealloc_allocator, careadlinkatcwd);
 }
 
-#ifdef USG
-/*
- *	All of the following are for USG.
- *
- *	On USG systems the system calls are INTERRUPTIBLE by signals
- *	that the user program has elected to catch.  Thus the system call
- *	must be retried in these cases.  To handle this without massive
- *	changes in the source code, we remap the standard system call names
- *	to names for our own functions in sysdep.c that do the system call
- *	with retries.  Actually, for portability reasons, it is good
- *	programming practice, as this example shows, to limit all actual
- *	system calls to a single occurrence in the source.  Sure, this
- *	adds an extra level of function call overhead but it is almost
- *	always negligible.   Fred Fish, Unisoft Systems Inc.
- */
-
-/*
- *	Warning, this function may not duplicate 4.2 action properly
- *	under error conditions.
- */
-
-#if !defined (HAVE_GETWD) || defined (BROKEN_GETWD)
-
-#ifndef MAXPATHLEN
-/* In 4.1, param.h fails to define this.  */
-#define MAXPATHLEN 1024
-#endif
-
-char *
-getwd (char *pathname)
-{
-  char *npath, *spath;
-  extern char *getcwd (char *, size_t);
-
-  block_input ();			/* getcwd uses malloc */
-  spath = npath = getcwd ((char *) 0, MAXPATHLEN);
-  if (spath == 0)
-    {
-      unblock_input ();
-      return spath;
-    }
-  /* On Altos 3068, getcwd can return @hostname/dir, so discard
-     up to first slash.  Should be harmless on other systems.  */
-  while (*npath && *npath != '/')
-    npath++;
-  strcpy (pathname, npath);
-  free (spath);			/* getcwd uses malloc */
-  unblock_input ();
-  return pathname;
-}
-
-#endif /* !defined (HAVE_GETWD) || defined (BROKEN_GETWD) */
-#endif /* USG */
-
 /* Directory routines for systems that don't have them. */
 
 #ifdef HAVE_DIRENT_H
diff --git a/src/w32.c b/src/w32.c
index b51022c6001..da778eb8541 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -908,8 +908,18 @@ static char startup_dir[MAXPATHLEN];
 
 /* Get the current working directory.  */
 char *
-getwd (char *dir)
+getcwd (char *dir, size_t dirsize)
 {
+  if (!dirsize)
+    {
+      errno = EINVAL;
+      return NULL;
+    }
+  if (dirsize <= strlen (startup_dir))
+    {
+      errno = ERANGE;
+      return NULL;
+    }
 #if 0
   if (GetCurrentDirectory (MAXPATHLEN, dir) > 0)
     return dir;
@@ -1825,7 +1835,7 @@ init_environment (char ** argv)
 	memcpy (*envp, "COMSPEC=", 8);
   }
 
-  /* Remember the initial working directory for getwd.  */
+  /* Remember the initial working directory for getcwd.  */
   /* FIXME: Do we need to resolve possible symlinks in startup_dir?
      Does it matter anywhere in Emacs?  */
   if (!GetCurrentDirectory (MAXPATHLEN, startup_dir))
diff --git a/src/w32.h b/src/w32.h
index 8309a3cc23d..23eda830268 100644
--- a/src/w32.h
+++ b/src/w32.h
@@ -163,7 +163,6 @@ extern int sys_spawnve (int, char *, char **, char **);
 extern void register_child (int, int);
 
 extern void sys_sleep (int);
-extern char *getwd (char *);
 extern int sys_link (const char *, const char *);
 
 
@@ -181,4 +180,3 @@ extern ssize_t emacs_gnutls_push (gnutls_transport_ptr_t p,
 #endif /* HAVE_GNUTLS */
 
 #endif /* EMACS_W32_H */
-