Add native Windows binary for bison.

bison/src/bison/2.4.1/bison-2.4.1/patches/bison-2.4.1-src/lib/progreloc.c

+/* Provide relocatable programs.
+   Copyright (C) 2003-2008 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2003.
+
+   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>
+
+/* Specification.  */
+#include "progname.h"
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+/* Get declaration of _NSGetExecutablePath on MacOS X 10.2 or newer.  */
+#if HAVE_MACH_O_DYLD_H
+# include <mach-o/dyld.h>
+#endif
+
+#if defined _WIN32 || defined __WIN32__
+# define WIN32_NATIVE
+#endif
+
+#if defined WIN32_NATIVE || defined __CYGWIN__
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+#endif
+
+#include "canonicalize.h"
+#include "relocatable.h"
+
+#ifdef NO_XMALLOC
+# include "areadlink.h"
+# define xreadlink areadlink
+#else
+# include "xreadlink.h"
+#endif
+
+#ifdef NO_XMALLOC
+# define xmalloc malloc
+# define xstrdup strdup
+#else
+# include "xalloc.h"
+#endif
+
+/* Pathname support.
+   ISSLASH(C)           tests whether C is a directory separator character.
+   IS_PATH_WITH_DIR(P)  tests whether P contains a directory specification.
+ */
+#if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
+  /* Win32, Cygwin, OS/2, DOS */
+# define ISSLASH(C) ((C) == '/' || (C) == '\\')
+# define HAS_DEVICE(P) \
+    ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \
+     && (P)[1] == ':')
+# define IS_PATH_WITH_DIR(P) \
+    (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P))
+# define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
+#else
+  /* Unix */
+# define ISSLASH(C) ((C) == '/')
+# define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL)
+# define FILE_SYSTEM_PREFIX_LEN(P) 0
+#endif
+
+/* The results of open() in this file are not used with fchdir,
+   therefore save some unnecessary work in fchdir.c.  */
+#undef open
+#undef close
+
+#undef set_program_name
+
+
+#if ENABLE_RELOCATABLE
+
+#ifdef __linux__
+/* File descriptor of the executable.
+   (Only used to verify that we find the correct executable.)  */
+static int executable_fd = -1;
+#endif
+
+/* Tests whether a given pathname may belong to the executable.  */
+static bool
+maybe_executable (const char *filename)
+{
+  /* Woe32 lacks the access() function, but Cygwin doesn't.  */
+#if !(defined WIN32_NATIVE && !defined __CYGWIN__)
+  if (access (filename, X_OK) < 0)
+    return false;
+
+#ifdef __linux__
+  if (executable_fd >= 0)
+    {
+      /* If we already have an executable_fd, check that filename points to
+         the same inode.  */
+      struct stat statexe;
+      struct stat statfile;
+
+      if (fstat (executable_fd, &statexe) >= 0)
+        {
+          if (stat (filename, &statfile) < 0)
+            return false;
+          if (!(statfile.st_dev
+                && statfile.st_dev == statexe.st_dev
+                && statfile.st_ino == statexe.st_ino))
+            return false;
+        }
+    }
+#endif
+#endif
+
+  return true;
+}
+
+/* Determine the full pathname of the current executable, freshly allocated.
+   Return NULL if unknown.
+   Guaranteed to work on Linux and Woe32.  Likely to work on the other
+   Unixes (maybe except BeOS), under most conditions.  */
+static char *
+find_executable (const char *argv0)
+{
+#if defined WIN32_NATIVE || defined __CYGWIN__
+  char location[MAX_PATH];
+  int length = GetModuleFileName (NULL, location, sizeof (location));
+  if (length < 0)
+    return NULL;
+  if (!IS_PATH_WITH_DIR (location))
+    /* Shouldn't happen.  */
+    return NULL;
+  {
+#if defined __CYGWIN__
+    /* cygwin-1.5.13 (2005-03-01) or newer would also allow a Linux-like
+       implementation: readlink of "/proc/self/exe".  But using the
+       result of the Win32 system call is simpler and is consistent with the
+       code in relocatable.c.  */
+    /* On Cygwin, we need to convert paths coming from Win32 system calls
+       to the Unix-like slashified notation.  */
+    static char location_as_posix_path[2 * MAX_PATH];
+    /* There's no error return defined for cygwin_conv_to_posix_path.
+       See cygwin-api/func-cygwin-conv-to-posix-path.html.
+       Does it overflow the buffer of expected size MAX_PATH or does it
+       truncate the path?  I don't know.  Let's catch both.  */
+    cygwin_conv_to_posix_path (location, location_as_posix_path);
+    location_as_posix_path[MAX_PATH - 1] = '\0';
+    if (strlen (location_as_posix_path) >= MAX_PATH - 1)
+      /* A sign of buffer overflow or path truncation.  */
+      return NULL;
+    /* Call canonicalize_file_name, because Cygwin supports symbolic links.  */
+    return canonicalize_file_name (location_as_posix_path);
+#else
+    return xstrdup (location);
+#endif
+  }
+#else /* Unix && !Cygwin */
+#ifdef __linux__
+  /* The executable is accessible as /proc/<pid>/exe.  In newer Linux
+     versions, also as /proc/self/exe.  Linux >= 2.1 provides a symlink
+     to the true pathname; older Linux versions give only device and ino,
+     enclosed in brackets, which we cannot use here.  */
+  {
+    char *link;
+
+    link = xreadlink ("/proc/self/exe");
+    if (link != NULL && link[0] != '[')
+      return link;
+    if (executable_fd < 0)
+      executable_fd = open ("/proc/self/exe", O_RDONLY, 0);
+
+    {
+      char buf[6+10+5];
+      sprintf (buf, "/proc/%d/exe", getpid ());
+      link = xreadlink (buf);
+      if (link != NULL && link[0] != '[')
+        return link;
+      if (executable_fd < 0)
+        executable_fd = open (buf, O_RDONLY, 0);
+    }
+  }
+#endif
+#if HAVE_MACH_O_DYLD_H && HAVE__NSGETEXECUTABLEPATH
+  /* On MacOS X 10.2 or newer, the function
+       int _NSGetExecutablePath (char *buf, unsigned long *bufsize);
+     can be used to retrieve the executable's full path.  */
+  char location[4096];
+  unsigned long length = sizeof (location);
+  if (_NSGetExecutablePath (location, &length) == 0
+      && location[0] == '/')
+    return canonicalize_file_name (location);
+#endif
+  /* Guess the executable's full path.  We assume the executable has been
+     called via execlp() or execvp() with properly set up argv[0].  The
+     login(1) convention to add a '-' prefix to argv[0] is not supported.  */
+  {
+    bool has_slash = false;
+    {
+      const char *p;
+      for (p = argv0; *p; p++)
+        if (*p == '/')
+          {
+            has_slash = true;
+            break;
+          }
+    }
+    if (!has_slash)
+      {
+        /* exec searches paths without slashes in the directory list given
+           by $PATH.  */
+        const char *path = getenv ("PATH");
+
+        if (path != NULL)
+          {
+            const char *p;
+            const char *p_next;
+
+            for (p = path; *p; p = p_next)
+              {
+                const char *q;
+                size_t p_len;
+                char *concat_name;
+
+                for (q = p; *q; q++)
+                  if (*q == ':')
+                    break;
+                p_len = q - p;
+                p_next = (*q == '\0' ? q : q + 1);
+
+                /* We have a path item at p, of length p_len.
+                   Now concatenate the path item and argv0.  */
+                concat_name = (char *) xmalloc (p_len + strlen (argv0) + 2);
+#ifdef NO_XMALLOC
+                if (concat_name == NULL)
+                  return NULL;
+#endif
+                if (p_len == 0)
+                  /* An empty PATH element designates the current directory.  */
+                  strcpy (concat_name, argv0);
+                else
+                  {
+                    memcpy (concat_name, p, p_len);
+                    concat_name[p_len] = '/';
+                    strcpy (concat_name + p_len + 1, argv0);
+                  }
+                if (maybe_executable (concat_name))
+                  return canonicalize_file_name (concat_name);
+                free (concat_name);
+              }
+          }
+        /* Not found in the PATH, assume the current directory.  */
+      }
+    /* exec treats paths containing slashes as relative to the current
+       directory.  */
+    if (maybe_executable (argv0))
+      return canonicalize_file_name (argv0);
+  }
+  /* No way to find the executable.  */
+  return NULL;
+#endif
+}
+
+/* Full pathname of executable, or NULL.  */
+static char *executable_fullname;
+
+static void
+prepare_relocate (const char *orig_installprefix, const char *orig_installdir,
+                  const char *argv0)
+{
+  char *curr_prefix;
+
+  /* Determine the full pathname of the current executable.  */
+  executable_fullname = find_executable (argv0);
+
+  /* Determine the current installation prefix from it.  */
+  curr_prefix = compute_curr_prefix (orig_installprefix, orig_installdir,
+                                     executable_fullname);
+  if (curr_prefix != NULL)
+    {
+      /* Now pass this prefix to all copies of the relocate.c source file.  */
+      set_relocation_prefix (orig_installprefix, curr_prefix);
+
+      free (curr_prefix);
+    }
+}
+
+/* Set program_name, based on argv[0], and original installation prefix and
+   directory, for relocatability.  */
+void
+set_program_name_and_installdir (const char *argv0,
+                                 const char *orig_installprefix,
+                                 const char *orig_installdir)
+{
+  const char *argv0_stripped = argv0;
+
+  /* Relocatable programs are renamed to .bin by install-reloc.  Or, more
+     generally, their suffix is changed from $exeext to .bin$exeext.
+     Remove the ".bin" here.  */
+  {
+    size_t argv0_len = strlen (argv0);
+    const size_t exeext_len = sizeof (EXEEXT) - sizeof ("");
+    if (argv0_len > 4 + exeext_len)
+      if (memcmp (argv0 + argv0_len - exeext_len - 4, ".bin", 4) == 0)
+        {
+          if (sizeof (EXEEXT) > sizeof (""))
+            {
+              /* Compare using an inlined copy of c_strncasecmp(), because
+                 the filenames may have undergone a case conversion since
+                 they were packaged.  In other words, EXEEXT may be ".exe"
+                 on one system and ".EXE" on another.  */
+              static const char exeext[] = EXEEXT;
+              const char *s1 = argv0 + argv0_len - exeext_len;
+              const char *s2 = exeext;
+              for (; *s1 != '\0'; s1++, s2++)
+                {
+                  unsigned char c1 = *s1;
+                  unsigned char c2 = *s2;
+                  if ((c1 >= 'A' && c1 <= 'Z' ? c1 - 'A' + 'a' : c1)
+                      != (c2 >= 'A' && c2 <= 'Z' ? c2 - 'A' + 'a' : c2))
+                    goto done_stripping;
+                }
+            }
+          /* Remove ".bin" before EXEEXT or its equivalent.  */
+          {
+            char *shorter = (char *) xmalloc (argv0_len - 4 + 1);
+#ifdef NO_XMALLOC
+            if (shorter != NULL)
+#endif
+              {
+                memcpy (shorter, argv0, argv0_len - exeext_len - 4);
+                if (sizeof (EXEEXT) > sizeof (""))
+                  memcpy (shorter + argv0_len - exeext_len - 4,
+                          argv0 + argv0_len - exeext_len - 4,
+                          exeext_len);
+                shorter[argv0_len - 4] = '\0';
+                argv0_stripped = shorter;
+              }
+          }
+         done_stripping: ;
+      }
+  }
+
+  set_program_name (argv0_stripped);
+
+  prepare_relocate (orig_installprefix, orig_installdir, argv0);
+}
+
+/* Return the full pathname of the current executable, based on the earlier
+   call to set_program_name_and_installdir.  Return NULL if unknown.  */
+char *
+get_full_program_name (void)
+{
+  return executable_fullname;
+}
+
+#endif