+++ /dev/null
-/* Provide relocatable packages.
- Copyright (C) 2003 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 Library General Public License as published
- by the Free Software Foundation; either version 2, 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
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
- USA. */
-
-
-/* Tell glibc's <stdio.h> to provide a prototype for getline().
- This must come before <config.h> because <config.h> may include
- <features.h>, and once <features.h> has been included, it's too late. */
-#ifndef _GNU_SOURCE
-# define _GNU_SOURCE 1
-#endif
-
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-/* Specification. */
-#include "relocatable.h"
-
-#if ENABLE_RELOCATABLE
-
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#ifdef NO_XMALLOC
-# define xmalloc malloc
-#else
-# include "xmalloc.h"
-#endif
-
-#if DEPENDS_ON_LIBCHARSET
-# include <libcharset.h>
-#endif
-#if DEPENDS_ON_LIBICONV && HAVE_ICONV
-# include <iconv.h>
-#endif
-#if DEPENDS_ON_LIBINTL && ENABLE_NLS
-# include <libintl.h>
-#endif
-
-/* Faked cheap 'bool'. */
-#undef bool
-#undef false
-#undef true
-#define bool int
-#define false 0
-#define true 1
-
-/* 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 __EMX__ || defined __DJGPP__
- /* Win32, 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 FILESYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
-#else
- /* Unix */
-# define ISSLASH(C) ((C) == '/')
-# define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL)
-# define FILESYSTEM_PREFIX_LEN(P) 0
-#endif
-
-/* Original installation prefix. */
-static char *orig_prefix;
-static size_t orig_prefix_len;
-/* Current installation prefix. */
-static char *curr_prefix;
-static size_t curr_prefix_len;
-/* These prefixes do not end in a slash. Anything that will be concatenated
- to them must start with a slash. */
-
-/* Sets the original and the current installation prefix of this module.
- Relocation simply replaces a pathname starting with the original prefix
- by the corresponding pathname with the current prefix instead. Both
- prefixes should be directory names without trailing slash (i.e. use ""
- instead of "/"). */
-static void
-set_this_relocation_prefix (const char *orig_prefix_arg,
- const char *curr_prefix_arg)
-{
- if (orig_prefix_arg != NULL && curr_prefix_arg != NULL
- /* Optimization: if orig_prefix and curr_prefix are equal, the
- relocation is a nop. */
- && strcmp (orig_prefix_arg, curr_prefix_arg) != 0)
- {
- /* Duplicate the argument strings. */
- char *memory;
-
- orig_prefix_len = strlen (orig_prefix_arg);
- curr_prefix_len = strlen (curr_prefix_arg);
- memory = (char *) xmalloc (orig_prefix_len + 1 + curr_prefix_len + 1);
-#ifdef NO_XMALLOC
- if (memory != NULL)
-#endif
- {
- memcpy (memory, orig_prefix_arg, orig_prefix_len + 1);
- orig_prefix = memory;
- memory += orig_prefix_len + 1;
- memcpy (memory, curr_prefix_arg, curr_prefix_len + 1);
- curr_prefix = memory;
- return;
- }
- }
- orig_prefix = NULL;
- curr_prefix = NULL;
- /* Don't worry about wasted memory here - this function is usually only
- called once. */
-}
-
-/* Sets the original and the current installation prefix of the package.
- Relocation simply replaces a pathname starting with the original prefix
- by the corresponding pathname with the current prefix instead. Both
- prefixes should be directory names without trailing slash (i.e. use ""
- instead of "/"). */
-void
-set_relocation_prefix (const char *orig_prefix_arg, const char *curr_prefix_arg)
-{
- set_this_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
-
- /* Now notify all dependent libraries. */
-#if DEPENDS_ON_LIBCHARSET
- libcharset_set_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
-#endif
-#if DEPENDS_ON_LIBICONV && HAVE_ICONV && _LIBICONV_VERSION >= 0x0109
- libiconv_set_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
-#endif
-#if DEPENDS_ON_LIBINTL && ENABLE_NLS && defined libintl_set_relocation_prefix
- libintl_set_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
-#endif
-}
-
-/* Convenience function:
- Computes the current installation prefix, based on the original
- installation prefix, the original installation directory of a particular
- file, and the current pathname of this file. Returns NULL upon failure. */
-#ifdef IN_LIBRARY
-#define compute_curr_prefix local_compute_curr_prefix
-static
-#endif
-const char *
-compute_curr_prefix (const char *orig_installprefix,
- const char *orig_installdir,
- const char *curr_pathname)
-{
- const char *curr_installdir;
- const char *rel_installdir;
-
- if (curr_pathname == NULL)
- return NULL;
-
- /* Determine the relative installation directory, relative to the prefix.
- This is simply the difference between orig_installprefix and
- orig_installdir. */
- if (strncmp (orig_installprefix, orig_installdir, strlen (orig_installprefix))
- != 0)
- /* Shouldn't happen - nothing should be installed outside $(prefix). */
- return NULL;
- rel_installdir = orig_installdir + strlen (orig_installprefix);
-
- /* Determine the current installation directory. */
- {
- const char *p_base = curr_pathname + FILESYSTEM_PREFIX_LEN (curr_pathname);
- const char *p = curr_pathname + strlen (curr_pathname);
- char *q;
-
- while (p > p_base)
- {
- p--;
- if (ISSLASH (*p))
- break;
- }
-
- q = (char *) xmalloc (p - curr_pathname + 1);
-#ifdef NO_XMALLOC
- if (q == NULL)
- return NULL;
-#endif
- memcpy (q, curr_pathname, p - curr_pathname);
- q[p - curr_pathname] = '\0';
- curr_installdir = q;
- }
-
- /* Compute the current installation prefix by removing the trailing
- rel_installdir from it. */
- {
- const char *rp = rel_installdir + strlen (rel_installdir);
- const char *cp = curr_installdir + strlen (curr_installdir);
- const char *cp_base =
- curr_installdir + FILESYSTEM_PREFIX_LEN (curr_installdir);
-
- while (rp > rel_installdir && cp > cp_base)
- {
- bool same = false;
- const char *rpi = rp;
- const char *cpi = cp;
-
- while (rpi > rel_installdir && cpi > cp_base)
- {
- rpi--;
- cpi--;
- if (ISSLASH (*rpi) || ISSLASH (*cpi))
- {
- if (ISSLASH (*rpi) && ISSLASH (*cpi))
- same = true;
- break;
- }
-#if defined _WIN32 || defined __WIN32__ || defined __EMX__ || defined __DJGPP__
- /* Win32, OS/2, DOS - case insignificant filesystem */
- if ((*rpi >= 'a' && *rpi <= 'z' ? *rpi - 'a' + 'A' : *rpi)
- != (*cpi >= 'a' && *cpi <= 'z' ? *cpi - 'a' + 'A' : *cpi))
- break;
-#else
- if (*rpi != *cpi)
- break;
-#endif
- }
- if (!same)
- break;
- /* The last pathname component was the same. opi and cpi now point
- to the slash before it. */
- rp = rpi;
- cp = cpi;
- }
-
- if (rp > rel_installdir)
- /* Unexpected: The curr_installdir does not end with rel_installdir. */
- return NULL;
-
- {
- size_t curr_prefix_len = cp - curr_installdir;
- char *curr_prefix;
-
- curr_prefix = (char *) xmalloc (curr_prefix_len + 1);
-#ifdef NO_XMALLOC
- if (curr_prefix == NULL)
- return NULL;
-#endif
- memcpy (curr_prefix, curr_installdir, curr_prefix_len);
- curr_prefix[curr_prefix_len] = '\0';
-
- return curr_prefix;
- }
- }
-}
-
-#if defined PIC && defined INSTALLDIR
-
-/* Full pathname of shared library, or NULL. */
-static char *shared_library_fullname;
-
-#if defined _WIN32 || defined __WIN32__
-
-/* Determine the full pathname of the shared library when it is loaded. */
-
-BOOL WINAPI
-DllMain (HINSTANCE module_handle, DWORD event, LPVOID reserved)
-{
- (void) reserved;
-
- if (event == DLL_PROCESS_ATTACH)
- {
- /* The DLL is being loaded into an application's address range. */
- static char location[MAX_PATH];
-
- if (!GetModuleFileName (module_handle, location, sizeof (location)))
- /* Shouldn't happen. */
- return FALSE;
-
- if (!IS_PATH_WITH_DIR (location))
- /* Shouldn't happen. */
- return FALSE;
-
- shared_library_fullname = strdup (location);
- }
-
- return TRUE;
-}
-
-#else /* Unix */
-
-static void
-find_shared_library_fullname ()
-{
-#ifdef __linux__
- FILE *fp;
-
- /* Open the current process' maps file. It describes one VMA per line. */
- fp = fopen ("/proc/self/maps", "r");
- if (fp)
- {
- unsigned long address = (unsigned long) &find_shared_library_fullname;
- for (;;)
- {
- unsigned long start, end;
- int c;
-
- if (fscanf (fp, "%lx-%lx", &start, &end) != 2)
- break;
- if (address >= start && address <= end - 1)
- {
- /* Found it. Now see if this line contains a filename. */
- while (c = getc (fp), c != EOF && c != '\n' && c != '/')
- continue;
- if (c == '/')
- {
- size_t size;
- int len;
-
- ungetc (c, fp);
- shared_library_fullname = NULL; size = 0;
- len = getline (&shared_library_fullname, &size, fp);
- if (len >= 0)
- {
- /* Success: filled shared_library_fullname. */
- if (len > 0 && shared_library_fullname[len - 1] == '\n')
- shared_library_fullname[len - 1] = '\0';
- }
- }
- break;
- }
- while (c = getc (fp), c != EOF && c != '\n')
- continue;
- }
- fclose (fp);
- }
-#endif
-}
-
-#endif /* WIN32 / Unix */
-
-/* Return the full pathname of the current shared library.
- Return NULL if unknown.
- Guaranteed to work only on Linux and Woe32. */
-static char *
-get_shared_library_fullname ()
-{
-#if !(defined _WIN32 || defined __WIN32__)
- static bool tried_find_shared_library_fullname;
- if (!tried_find_shared_library_fullname)
- {
- find_shared_library_fullname ();
- tried_find_shared_library_fullname = true;
- }
-#endif
- return shared_library_fullname;
-}
-
-#endif /* PIC */
-
-/* Returns the pathname, relocated according to the current installation
- directory. */
-const char *
-relocate (const char *pathname)
-{
-#if defined PIC && defined INSTALLDIR
- static int initialized;
-
- /* Initialization code for a shared library. */
- if (!initialized)
- {
- /* At this point, orig_prefix and curr_prefix likely have already been
- set through the main program's set_program_name_and_installdir
- function. This is sufficient in the case that the library has
- initially been installed in the same orig_prefix. But we can do
- better, to also cover the cases that 1. it has been installed
- in a different prefix before being moved to orig_prefix and (later)
- to curr_prefix, 2. unlike the program, it has not moved away from
- orig_prefix. */
- const char *orig_installprefix = INSTALLPREFIX;
- const char *orig_installdir = INSTALLDIR;
- const char *curr_prefix_better;
-
- curr_prefix_better =
- compute_curr_prefix (orig_installprefix, orig_installdir,
- get_shared_library_fullname ());
- if (curr_prefix_better == NULL)
- curr_prefix_better = curr_prefix;
-
- set_relocation_prefix (orig_installprefix, curr_prefix_better);
-
- initialized = 1;
- }
-#endif
-
- /* Note: It is not necessary to perform case insensitive comparison here,
- even for DOS-like filesystems, because the pathname argument was
- typically created from the same Makefile variable as orig_prefix came
- from. */
- if (orig_prefix != NULL && curr_prefix != NULL
- && strncmp (pathname, orig_prefix, orig_prefix_len) == 0)
- {
- if (pathname[orig_prefix_len] == '\0')
- /* pathname equals orig_prefix. */
- return curr_prefix;
- if (ISSLASH (pathname[orig_prefix_len]))
- {
- /* pathname starts with orig_prefix. */
- const char *pathname_tail = &pathname[orig_prefix_len];
- char *result =
- (char *) xmalloc (curr_prefix_len + strlen (pathname_tail) + 1);
-
-#ifdef NO_XMALLOC
- if (result != NULL)
-#endif
- {
- memcpy (result, curr_prefix, curr_prefix_len);
- strcpy (result + curr_prefix_len, pathname_tail);
- return result;
- }
- }
- }
- /* Nothing to relocate. */
- return pathname;
-}
-
-#endif
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