version 1.1, 2012/02/21 22:57:48
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version 1.1.1.3, 2021/03/17 13:38:46
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/* Provide relocatable packages. |
/* Provide relocatable packages. |
Copyright (C) 2003, 2005 Free Software Foundation, Inc. | Copyright (C) 2003, 2005, 2008-2017 Free Software Foundation, Inc. |
Written by Bruno Haible <bruno@clisp.org>, 2003. |
Written by Bruno Haible <bruno@clisp.org>, 2003. |
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This program is free software; you can redistribute it and/or modify it |
This program is free software; you can redistribute it and/or modify it |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
Library General Public License for more details. |
Library General Public License for more details. |
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You should have received a copy of the GNU Library General Public | You should have received a copy of the GNU Library General Public License |
License along with this program; if not, write to the Free Software | along with this program; if not, see <https://www.gnu.org/licenses/>. */ |
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, | |
USA. */ | |
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#ifndef _RELOCATABLE_H |
#ifndef _RELOCATABLE_H |
#define _RELOCATABLE_H |
#define _RELOCATABLE_H |
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instead of "/"). */ |
instead of "/"). */ |
extern RELOCATABLE_DLL_EXPORTED void |
extern RELOCATABLE_DLL_EXPORTED void |
set_relocation_prefix (const char *orig_prefix, |
set_relocation_prefix (const char *orig_prefix, |
const char *curr_prefix); | const char *curr_prefix); |
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/* Returns the pathname, relocated according to the current installation |
/* Returns the pathname, relocated according to the current installation |
directory. */ | directory. |
| The returned string is either PATHNAME unmodified or a freshly allocated |
| string that you can free with free() after casting it to 'char *'. */ |
extern const char * relocate (const char *pathname); |
extern const char * relocate (const char *pathname); |
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/* Memory management: relocate() leaks memory, because it has to construct | /* Returns the pathname, relocated according to the current installation |
a fresh pathname. If this is a problem because your program calls | directory. |
relocate() frequently, think about caching the result. */ | This function sets *ALLOCATEDP to the allocated memory, or to NULL if |
| no memory allocation occurs. So that, after you're done with the return |
| value, to reclaim allocated memory, you can do: free (*ALLOCATEDP). */ |
| extern const char * relocate2 (const char *pathname, char **allocatedp); |
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/* Memory management: relocate() potentially allocates memory, because it has |
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to construct a fresh pathname. If this is a problem because your program |
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calls relocate() frequently or because you want to fix all potential memory |
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leaks anyway, you have three options: |
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1) Use this idiom: |
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const char *pathname = ...; |
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const char *rel_pathname = relocate (pathname); |
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... |
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if (rel_pathname != pathname) |
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free ((char *) rel_pathname); |
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2) Use this idiom: |
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char *allocated; |
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const char *rel_pathname = relocate2 (..., &allocated); |
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... |
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free (allocated); |
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3) Think about caching the result. */ |
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/* Convenience function: |
/* Convenience function: |
Computes the current installation prefix, based on the original |
Computes the current installation prefix, based on the original |
installation prefix, the original installation directory of a particular |
installation prefix, the original installation directory of a particular |
file, and the current pathname of this file. Returns NULL upon failure. */ | file, and the current pathname of this file. |
extern const char * compute_curr_prefix (const char *orig_installprefix, | Returns it, freshly allocated. Returns NULL upon failure. */ |
const char *orig_installdir, | extern char * compute_curr_prefix (const char *orig_installprefix, |
const char *curr_pathname); | const char *orig_installdir, |
| const char *curr_pathname); |
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#else |
#else |
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/* By default, we use the hardwired pathnames. */ |
/* By default, we use the hardwired pathnames. */ |
#define relocate(pathname) (pathname) |
#define relocate(pathname) (pathname) |
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#define relocate2(pathname,allocatedp) (*(allocatedp) = NULL, (pathname)) |
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#endif |
#endif |
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