const char *
relocate (const char *pathname)
{
#if defined PIC && defined INSTALLDIR
static int initialized;
if (!initialized)
{
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
if (orig_prefix != NULL && curr_prefix != NULL
&& strncmp (pathname, orig_prefix, orig_prefix_len) == 0)
{
if (pathname[orig_prefix_len] == '\0')
return curr_prefix;
if (ISSLASH (pathname[orig_prefix_len]))
{
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;
}
}
}
return pathname;
}
static void
prepare_relocate (const char *orig_installprefix, const char *orig_installdir,
const char *argv0)
{
const 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);
}
/* 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;
}
/* Returns the pathname, relocated according to the current installation
directory.
The returned string is either PATHNAME unmodified or a freshly allocated
string that you can free with free() after casting it to 'char *'. */
const char *
relocate (const char *pathname)
{
#if defined PIC && defined INSTALLDIR && ENABLE_COSTLY_RELOCATABLE
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;
char *curr_prefix_better;
curr_prefix_better =
compute_curr_prefix (orig_installprefix, orig_installdir,
get_shared_library_fullname ());
set_relocation_prefix (orig_installprefix,
curr_prefix_better != NULL
? curr_prefix_better
: curr_prefix);
if (curr_prefix_better != NULL)
free (curr_prefix_better);
initialized = 1;
}
#endif
/* Note: It is not necessary to perform case insensitive comparison here,
even for DOS-like file systems, 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. */
char *result = (char *) xmalloc (strlen (curr_prefix) + 1);
#ifdef NO_XMALLOC
if (result != NULL)
#endif
{
strcpy (result, curr_prefix);
return result;
}
}
else 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;
}
}
}
#ifdef __EMX__
# ifdef __KLIBC__
# undef strncmp
if (pathname && strncmp (pathname, "/@unixroot", 10) == 0
&& (pathname[10] == '\0' || pathname[10] == '/' || pathname[10] == '\\'))
{
/* kLIBC itself processes /@unixroot prefix */
return pathname;
}
else
# endif
if (pathname && ISSLASH (pathname[0]))
{
const char *unixroot = getenv ("UNIXROOT");
if (unixroot && HAS_DEVICE (unixroot) && !unixroot[2])
{
char *result = (char *) xmalloc (2 + strlen (pathname) + 1);
#ifdef NO_XMALLOC
if (result != NULL)
#endif
{
strcpy (result, unixroot);
strcpy (result + 2, pathname);
return result;
}
}
}
#endif
/* Nothing to relocate. */
return pathname;
}
