1*a1acfa9bSespie /* Provide relocatable packages.
2*a1acfa9bSespie Copyright (C) 2003 Free Software Foundation, Inc.
3*a1acfa9bSespie Written by Bruno Haible <bruno@clisp.org>, 2003.
4*a1acfa9bSespie
5*a1acfa9bSespie This program is free software; you can redistribute it and/or modify it
6*a1acfa9bSespie under the terms of the GNU Library General Public License as published
7*a1acfa9bSespie by the Free Software Foundation; either version 2, or (at your option)
8*a1acfa9bSespie any later version.
9*a1acfa9bSespie
10*a1acfa9bSespie This program is distributed in the hope that it will be useful,
11*a1acfa9bSespie but WITHOUT ANY WARRANTY; without even the implied warranty of
12*a1acfa9bSespie MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13*a1acfa9bSespie Library General Public License for more details.
14*a1acfa9bSespie
15*a1acfa9bSespie You should have received a copy of the GNU Library General Public
16*a1acfa9bSespie License along with this program; if not, write to the Free Software
17*a1acfa9bSespie Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
18*a1acfa9bSespie USA. */
19*a1acfa9bSespie
20*a1acfa9bSespie
21*a1acfa9bSespie /* Tell glibc's <stdio.h> to provide a prototype for getline().
22*a1acfa9bSespie This must come before <config.h> because <config.h> may include
23*a1acfa9bSespie <features.h>, and once <features.h> has been included, it's too late. */
24*a1acfa9bSespie #ifndef _GNU_SOURCE
25*a1acfa9bSespie # define _GNU_SOURCE 1
26*a1acfa9bSespie #endif
27*a1acfa9bSespie
28*a1acfa9bSespie #ifdef HAVE_CONFIG_H
29*a1acfa9bSespie # include "config.h"
30*a1acfa9bSespie #endif
31*a1acfa9bSespie
32*a1acfa9bSespie /* Specification. */
33*a1acfa9bSespie #include "relocatable.h"
34*a1acfa9bSespie
35*a1acfa9bSespie #if ENABLE_RELOCATABLE
36*a1acfa9bSespie
37*a1acfa9bSespie #include <stddef.h>
38*a1acfa9bSespie #include <stdio.h>
39*a1acfa9bSespie #include <stdlib.h>
40*a1acfa9bSespie #include <string.h>
41*a1acfa9bSespie
42*a1acfa9bSespie #ifdef NO_XMALLOC
43*a1acfa9bSespie # define xmalloc malloc
44*a1acfa9bSespie #else
45*a1acfa9bSespie # include "xalloc.h"
46*a1acfa9bSespie #endif
47*a1acfa9bSespie
48*a1acfa9bSespie #if defined _WIN32 || defined __WIN32__
49*a1acfa9bSespie # define WIN32_LEAN_AND_MEAN
50*a1acfa9bSespie # include <windows.h>
51*a1acfa9bSespie #endif
52*a1acfa9bSespie
53*a1acfa9bSespie #if DEPENDS_ON_LIBCHARSET
54*a1acfa9bSespie # include <libcharset.h>
55*a1acfa9bSespie #endif
56*a1acfa9bSespie #if DEPENDS_ON_LIBICONV && HAVE_ICONV
57*a1acfa9bSespie # include <iconv.h>
58*a1acfa9bSespie #endif
59*a1acfa9bSespie #if DEPENDS_ON_LIBINTL && ENABLE_NLS
60*a1acfa9bSespie # include <libintl.h>
61*a1acfa9bSespie #endif
62*a1acfa9bSespie
63*a1acfa9bSespie /* Faked cheap 'bool'. */
64*a1acfa9bSespie #undef bool
65*a1acfa9bSespie #undef false
66*a1acfa9bSespie #undef true
67*a1acfa9bSespie #define bool int
68*a1acfa9bSespie #define false 0
69*a1acfa9bSespie #define true 1
70*a1acfa9bSespie
71*a1acfa9bSespie /* Pathname support.
72*a1acfa9bSespie ISSLASH(C) tests whether C is a directory separator character.
73*a1acfa9bSespie IS_PATH_WITH_DIR(P) tests whether P contains a directory specification.
74*a1acfa9bSespie */
75*a1acfa9bSespie #if defined _WIN32 || defined __WIN32__ || defined __EMX__ || defined __DJGPP__
76*a1acfa9bSespie /* Win32, OS/2, DOS */
77*a1acfa9bSespie # define ISSLASH(C) ((C) == '/' || (C) == '\\')
78*a1acfa9bSespie # define HAS_DEVICE(P) \
79*a1acfa9bSespie ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \
80*a1acfa9bSespie && (P)[1] == ':')
81*a1acfa9bSespie # define IS_PATH_WITH_DIR(P) \
82*a1acfa9bSespie (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P))
83*a1acfa9bSespie # define FILESYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
84*a1acfa9bSespie #else
85*a1acfa9bSespie /* Unix */
86*a1acfa9bSespie # define ISSLASH(C) ((C) == '/')
87*a1acfa9bSespie # define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL)
88*a1acfa9bSespie # define FILESYSTEM_PREFIX_LEN(P) 0
89*a1acfa9bSespie #endif
90*a1acfa9bSespie
91*a1acfa9bSespie /* Original installation prefix. */
92*a1acfa9bSespie static char *orig_prefix;
93*a1acfa9bSespie static size_t orig_prefix_len;
94*a1acfa9bSespie /* Current installation prefix. */
95*a1acfa9bSespie static char *curr_prefix;
96*a1acfa9bSespie static size_t curr_prefix_len;
97*a1acfa9bSespie /* These prefixes do not end in a slash. Anything that will be concatenated
98*a1acfa9bSespie to them must start with a slash. */
99*a1acfa9bSespie
100*a1acfa9bSespie /* Sets the original and the current installation prefix of this module.
101*a1acfa9bSespie Relocation simply replaces a pathname starting with the original prefix
102*a1acfa9bSespie by the corresponding pathname with the current prefix instead. Both
103*a1acfa9bSespie prefixes should be directory names without trailing slash (i.e. use ""
104*a1acfa9bSespie instead of "/"). */
105*a1acfa9bSespie static void
set_this_relocation_prefix(const char * orig_prefix_arg,const char * curr_prefix_arg)106*a1acfa9bSespie set_this_relocation_prefix (const char *orig_prefix_arg,
107*a1acfa9bSespie const char *curr_prefix_arg)
108*a1acfa9bSespie {
109*a1acfa9bSespie if (orig_prefix_arg != NULL && curr_prefix_arg != NULL
110*a1acfa9bSespie /* Optimization: if orig_prefix and curr_prefix are equal, the
111*a1acfa9bSespie relocation is a nop. */
112*a1acfa9bSespie && strcmp (orig_prefix_arg, curr_prefix_arg) != 0)
113*a1acfa9bSespie {
114*a1acfa9bSespie /* Duplicate the argument strings. */
115*a1acfa9bSespie char *memory;
116*a1acfa9bSespie
117*a1acfa9bSespie orig_prefix_len = strlen (orig_prefix_arg);
118*a1acfa9bSespie curr_prefix_len = strlen (curr_prefix_arg);
119*a1acfa9bSespie memory = (char *) xmalloc (orig_prefix_len + 1 + curr_prefix_len + 1);
120*a1acfa9bSespie #ifdef NO_XMALLOC
121*a1acfa9bSespie if (memory != NULL)
122*a1acfa9bSespie #endif
123*a1acfa9bSespie {
124*a1acfa9bSespie memcpy (memory, orig_prefix_arg, orig_prefix_len + 1);
125*a1acfa9bSespie orig_prefix = memory;
126*a1acfa9bSespie memory += orig_prefix_len + 1;
127*a1acfa9bSespie memcpy (memory, curr_prefix_arg, curr_prefix_len + 1);
128*a1acfa9bSespie curr_prefix = memory;
129*a1acfa9bSespie return;
130*a1acfa9bSespie }
131*a1acfa9bSespie }
132*a1acfa9bSespie orig_prefix = NULL;
133*a1acfa9bSespie curr_prefix = NULL;
134*a1acfa9bSespie /* Don't worry about wasted memory here - this function is usually only
135*a1acfa9bSespie called once. */
136*a1acfa9bSespie }
137*a1acfa9bSespie
138*a1acfa9bSespie /* Sets the original and the current installation prefix of the package.
139*a1acfa9bSespie Relocation simply replaces a pathname starting with the original prefix
140*a1acfa9bSespie by the corresponding pathname with the current prefix instead. Both
141*a1acfa9bSespie prefixes should be directory names without trailing slash (i.e. use ""
142*a1acfa9bSespie instead of "/"). */
143*a1acfa9bSespie void
set_relocation_prefix(const char * orig_prefix_arg,const char * curr_prefix_arg)144*a1acfa9bSespie set_relocation_prefix (const char *orig_prefix_arg, const char *curr_prefix_arg)
145*a1acfa9bSespie {
146*a1acfa9bSespie set_this_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
147*a1acfa9bSespie
148*a1acfa9bSespie /* Now notify all dependent libraries. */
149*a1acfa9bSespie #if DEPENDS_ON_LIBCHARSET
150*a1acfa9bSespie libcharset_set_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
151*a1acfa9bSespie #endif
152*a1acfa9bSespie #if DEPENDS_ON_LIBICONV && HAVE_ICONV && _LIBICONV_VERSION >= 0x0109
153*a1acfa9bSespie libiconv_set_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
154*a1acfa9bSespie #endif
155*a1acfa9bSespie #if DEPENDS_ON_LIBINTL && ENABLE_NLS && defined libintl_set_relocation_prefix
156*a1acfa9bSespie libintl_set_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
157*a1acfa9bSespie #endif
158*a1acfa9bSespie }
159*a1acfa9bSespie
160*a1acfa9bSespie #if !defined IN_LIBRARY || (defined PIC && defined INSTALLDIR)
161*a1acfa9bSespie
162*a1acfa9bSespie /* Convenience function:
163*a1acfa9bSespie Computes the current installation prefix, based on the original
164*a1acfa9bSespie installation prefix, the original installation directory of a particular
165*a1acfa9bSespie file, and the current pathname of this file. Returns NULL upon failure. */
166*a1acfa9bSespie #ifdef IN_LIBRARY
167*a1acfa9bSespie #define compute_curr_prefix local_compute_curr_prefix
168*a1acfa9bSespie static
169*a1acfa9bSespie #endif
170*a1acfa9bSespie const char *
compute_curr_prefix(const char * orig_installprefix,const char * orig_installdir,const char * curr_pathname)171*a1acfa9bSespie compute_curr_prefix (const char *orig_installprefix,
172*a1acfa9bSespie const char *orig_installdir,
173*a1acfa9bSespie const char *curr_pathname)
174*a1acfa9bSespie {
175*a1acfa9bSespie const char *curr_installdir;
176*a1acfa9bSespie const char *rel_installdir;
177*a1acfa9bSespie
178*a1acfa9bSespie if (curr_pathname == NULL)
179*a1acfa9bSespie return NULL;
180*a1acfa9bSespie
181*a1acfa9bSespie /* Determine the relative installation directory, relative to the prefix.
182*a1acfa9bSespie This is simply the difference between orig_installprefix and
183*a1acfa9bSespie orig_installdir. */
184*a1acfa9bSespie if (strncmp (orig_installprefix, orig_installdir, strlen (orig_installprefix))
185*a1acfa9bSespie != 0)
186*a1acfa9bSespie /* Shouldn't happen - nothing should be installed outside $(prefix). */
187*a1acfa9bSespie return NULL;
188*a1acfa9bSespie rel_installdir = orig_installdir + strlen (orig_installprefix);
189*a1acfa9bSespie
190*a1acfa9bSespie /* Determine the current installation directory. */
191*a1acfa9bSespie {
192*a1acfa9bSespie const char *p_base = curr_pathname + FILESYSTEM_PREFIX_LEN (curr_pathname);
193*a1acfa9bSespie const char *p = curr_pathname + strlen (curr_pathname);
194*a1acfa9bSespie char *q;
195*a1acfa9bSespie
196*a1acfa9bSespie while (p > p_base)
197*a1acfa9bSespie {
198*a1acfa9bSespie p--;
199*a1acfa9bSespie if (ISSLASH (*p))
200*a1acfa9bSespie break;
201*a1acfa9bSespie }
202*a1acfa9bSespie
203*a1acfa9bSespie q = (char *) xmalloc (p - curr_pathname + 1);
204*a1acfa9bSespie #ifdef NO_XMALLOC
205*a1acfa9bSespie if (q == NULL)
206*a1acfa9bSespie return NULL;
207*a1acfa9bSespie #endif
208*a1acfa9bSespie memcpy (q, curr_pathname, p - curr_pathname);
209*a1acfa9bSespie q[p - curr_pathname] = '\0';
210*a1acfa9bSespie curr_installdir = q;
211*a1acfa9bSespie }
212*a1acfa9bSespie
213*a1acfa9bSespie /* Compute the current installation prefix by removing the trailing
214*a1acfa9bSespie rel_installdir from it. */
215*a1acfa9bSespie {
216*a1acfa9bSespie const char *rp = rel_installdir + strlen (rel_installdir);
217*a1acfa9bSespie const char *cp = curr_installdir + strlen (curr_installdir);
218*a1acfa9bSespie const char *cp_base =
219*a1acfa9bSespie curr_installdir + FILESYSTEM_PREFIX_LEN (curr_installdir);
220*a1acfa9bSespie
221*a1acfa9bSespie while (rp > rel_installdir && cp > cp_base)
222*a1acfa9bSespie {
223*a1acfa9bSespie bool same = false;
224*a1acfa9bSespie const char *rpi = rp;
225*a1acfa9bSespie const char *cpi = cp;
226*a1acfa9bSespie
227*a1acfa9bSespie while (rpi > rel_installdir && cpi > cp_base)
228*a1acfa9bSespie {
229*a1acfa9bSespie rpi--;
230*a1acfa9bSespie cpi--;
231*a1acfa9bSespie if (ISSLASH (*rpi) || ISSLASH (*cpi))
232*a1acfa9bSespie {
233*a1acfa9bSespie if (ISSLASH (*rpi) && ISSLASH (*cpi))
234*a1acfa9bSespie same = true;
235*a1acfa9bSespie break;
236*a1acfa9bSespie }
237*a1acfa9bSespie #if defined _WIN32 || defined __WIN32__ || defined __EMX__ || defined __DJGPP__
238*a1acfa9bSespie /* Win32, OS/2, DOS - case insignificant filesystem */
239*a1acfa9bSespie if ((*rpi >= 'a' && *rpi <= 'z' ? *rpi - 'a' + 'A' : *rpi)
240*a1acfa9bSespie != (*cpi >= 'a' && *cpi <= 'z' ? *cpi - 'a' + 'A' : *cpi))
241*a1acfa9bSespie break;
242*a1acfa9bSespie #else
243*a1acfa9bSespie if (*rpi != *cpi)
244*a1acfa9bSespie break;
245*a1acfa9bSespie #endif
246*a1acfa9bSespie }
247*a1acfa9bSespie if (!same)
248*a1acfa9bSespie break;
249*a1acfa9bSespie /* The last pathname component was the same. opi and cpi now point
250*a1acfa9bSespie to the slash before it. */
251*a1acfa9bSespie rp = rpi;
252*a1acfa9bSespie cp = cpi;
253*a1acfa9bSespie }
254*a1acfa9bSespie
255*a1acfa9bSespie if (rp > rel_installdir)
256*a1acfa9bSespie /* Unexpected: The curr_installdir does not end with rel_installdir. */
257*a1acfa9bSespie return NULL;
258*a1acfa9bSespie
259*a1acfa9bSespie {
260*a1acfa9bSespie size_t curr_prefix_len = cp - curr_installdir;
261*a1acfa9bSespie char *curr_prefix;
262*a1acfa9bSespie
263*a1acfa9bSespie curr_prefix = (char *) xmalloc (curr_prefix_len + 1);
264*a1acfa9bSespie #ifdef NO_XMALLOC
265*a1acfa9bSespie if (curr_prefix == NULL)
266*a1acfa9bSespie return NULL;
267*a1acfa9bSespie #endif
268*a1acfa9bSespie memcpy (curr_prefix, curr_installdir, curr_prefix_len);
269*a1acfa9bSespie curr_prefix[curr_prefix_len] = '\0';
270*a1acfa9bSespie
271*a1acfa9bSespie return curr_prefix;
272*a1acfa9bSespie }
273*a1acfa9bSespie }
274*a1acfa9bSespie }
275*a1acfa9bSespie
276*a1acfa9bSespie #endif /* !IN_LIBRARY || PIC */
277*a1acfa9bSespie
278*a1acfa9bSespie #if defined PIC && defined INSTALLDIR
279*a1acfa9bSespie
280*a1acfa9bSespie /* Full pathname of shared library, or NULL. */
281*a1acfa9bSespie static char *shared_library_fullname;
282*a1acfa9bSespie
283*a1acfa9bSespie #if defined _WIN32 || defined __WIN32__
284*a1acfa9bSespie
285*a1acfa9bSespie /* Determine the full pathname of the shared library when it is loaded. */
286*a1acfa9bSespie
287*a1acfa9bSespie BOOL WINAPI
DllMain(HINSTANCE module_handle,DWORD event,LPVOID reserved)288*a1acfa9bSespie DllMain (HINSTANCE module_handle, DWORD event, LPVOID reserved)
289*a1acfa9bSespie {
290*a1acfa9bSespie (void) reserved;
291*a1acfa9bSespie
292*a1acfa9bSespie if (event == DLL_PROCESS_ATTACH)
293*a1acfa9bSespie {
294*a1acfa9bSespie /* The DLL is being loaded into an application's address range. */
295*a1acfa9bSespie static char location[MAX_PATH];
296*a1acfa9bSespie
297*a1acfa9bSespie if (!GetModuleFileName (module_handle, location, sizeof (location)))
298*a1acfa9bSespie /* Shouldn't happen. */
299*a1acfa9bSespie return FALSE;
300*a1acfa9bSespie
301*a1acfa9bSespie if (!IS_PATH_WITH_DIR (location))
302*a1acfa9bSespie /* Shouldn't happen. */
303*a1acfa9bSespie return FALSE;
304*a1acfa9bSespie
305*a1acfa9bSespie shared_library_fullname = strdup (location);
306*a1acfa9bSespie }
307*a1acfa9bSespie
308*a1acfa9bSespie return TRUE;
309*a1acfa9bSespie }
310*a1acfa9bSespie
311*a1acfa9bSespie #else /* Unix */
312*a1acfa9bSespie
313*a1acfa9bSespie static void
find_shared_library_fullname()314*a1acfa9bSespie find_shared_library_fullname ()
315*a1acfa9bSespie {
316*a1acfa9bSespie #if defined __linux__ && __GLIBC__ >= 2
317*a1acfa9bSespie /* Linux has /proc/self/maps. glibc 2 has the getline() function. */
318*a1acfa9bSespie FILE *fp;
319*a1acfa9bSespie
320*a1acfa9bSespie /* Open the current process' maps file. It describes one VMA per line. */
321*a1acfa9bSespie fp = fopen ("/proc/self/maps", "r");
322*a1acfa9bSespie if (fp)
323*a1acfa9bSespie {
324*a1acfa9bSespie unsigned long address = (unsigned long) &find_shared_library_fullname;
325*a1acfa9bSespie for (;;)
326*a1acfa9bSespie {
327*a1acfa9bSespie unsigned long start, end;
328*a1acfa9bSespie int c;
329*a1acfa9bSespie
330*a1acfa9bSespie if (fscanf (fp, "%lx-%lx", &start, &end) != 2)
331*a1acfa9bSespie break;
332*a1acfa9bSespie if (address >= start && address <= end - 1)
333*a1acfa9bSespie {
334*a1acfa9bSespie /* Found it. Now see if this line contains a filename. */
335*a1acfa9bSespie while (c = getc (fp), c != EOF && c != '\n' && c != '/')
336*a1acfa9bSespie continue;
337*a1acfa9bSespie if (c == '/')
338*a1acfa9bSespie {
339*a1acfa9bSespie size_t size;
340*a1acfa9bSespie int len;
341*a1acfa9bSespie
342*a1acfa9bSespie ungetc (c, fp);
343*a1acfa9bSespie shared_library_fullname = NULL; size = 0;
344*a1acfa9bSespie len = getline (&shared_library_fullname, &size, fp);
345*a1acfa9bSespie if (len >= 0)
346*a1acfa9bSespie {
347*a1acfa9bSespie /* Success: filled shared_library_fullname. */
348*a1acfa9bSespie if (len > 0 && shared_library_fullname[len - 1] == '\n')
349*a1acfa9bSespie shared_library_fullname[len - 1] = '\0';
350*a1acfa9bSespie }
351*a1acfa9bSespie }
352*a1acfa9bSespie break;
353*a1acfa9bSespie }
354*a1acfa9bSespie while (c = getc (fp), c != EOF && c != '\n')
355*a1acfa9bSespie continue;
356*a1acfa9bSespie }
357*a1acfa9bSespie fclose (fp);
358*a1acfa9bSespie }
359*a1acfa9bSespie #endif
360*a1acfa9bSespie }
361*a1acfa9bSespie
362*a1acfa9bSespie #endif /* WIN32 / Unix */
363*a1acfa9bSespie
364*a1acfa9bSespie /* Return the full pathname of the current shared library.
365*a1acfa9bSespie Return NULL if unknown.
366*a1acfa9bSespie Guaranteed to work only on Linux and Woe32. */
367*a1acfa9bSespie static char *
get_shared_library_fullname()368*a1acfa9bSespie get_shared_library_fullname ()
369*a1acfa9bSespie {
370*a1acfa9bSespie #if !(defined _WIN32 || defined __WIN32__)
371*a1acfa9bSespie static bool tried_find_shared_library_fullname;
372*a1acfa9bSespie if (!tried_find_shared_library_fullname)
373*a1acfa9bSespie {
374*a1acfa9bSespie find_shared_library_fullname ();
375*a1acfa9bSespie tried_find_shared_library_fullname = true;
376*a1acfa9bSespie }
377*a1acfa9bSespie #endif
378*a1acfa9bSespie return shared_library_fullname;
379*a1acfa9bSespie }
380*a1acfa9bSespie
381*a1acfa9bSespie #endif /* PIC */
382*a1acfa9bSespie
383*a1acfa9bSespie /* Returns the pathname, relocated according to the current installation
384*a1acfa9bSespie directory. */
385*a1acfa9bSespie const char *
relocate(const char * pathname)386*a1acfa9bSespie relocate (const char *pathname)
387*a1acfa9bSespie {
388*a1acfa9bSespie #if defined PIC && defined INSTALLDIR
389*a1acfa9bSespie static int initialized;
390*a1acfa9bSespie
391*a1acfa9bSespie /* Initialization code for a shared library. */
392*a1acfa9bSespie if (!initialized)
393*a1acfa9bSespie {
394*a1acfa9bSespie /* At this point, orig_prefix and curr_prefix likely have already been
395*a1acfa9bSespie set through the main program's set_program_name_and_installdir
396*a1acfa9bSespie function. This is sufficient in the case that the library has
397*a1acfa9bSespie initially been installed in the same orig_prefix. But we can do
398*a1acfa9bSespie better, to also cover the cases that 1. it has been installed
399*a1acfa9bSespie in a different prefix before being moved to orig_prefix and (later)
400*a1acfa9bSespie to curr_prefix, 2. unlike the program, it has not moved away from
401*a1acfa9bSespie orig_prefix. */
402*a1acfa9bSespie const char *orig_installprefix = INSTALLPREFIX;
403*a1acfa9bSespie const char *orig_installdir = INSTALLDIR;
404*a1acfa9bSespie const char *curr_prefix_better;
405*a1acfa9bSespie
406*a1acfa9bSespie curr_prefix_better =
407*a1acfa9bSespie compute_curr_prefix (orig_installprefix, orig_installdir,
408*a1acfa9bSespie get_shared_library_fullname ());
409*a1acfa9bSespie if (curr_prefix_better == NULL)
410*a1acfa9bSespie curr_prefix_better = curr_prefix;
411*a1acfa9bSespie
412*a1acfa9bSespie set_relocation_prefix (orig_installprefix, curr_prefix_better);
413*a1acfa9bSespie
414*a1acfa9bSespie initialized = 1;
415*a1acfa9bSespie }
416*a1acfa9bSespie #endif
417*a1acfa9bSespie
418*a1acfa9bSespie /* Note: It is not necessary to perform case insensitive comparison here,
419*a1acfa9bSespie even for DOS-like filesystems, because the pathname argument was
420*a1acfa9bSespie typically created from the same Makefile variable as orig_prefix came
421*a1acfa9bSespie from. */
422*a1acfa9bSespie if (orig_prefix != NULL && curr_prefix != NULL
423*a1acfa9bSespie && strncmp (pathname, orig_prefix, orig_prefix_len) == 0)
424*a1acfa9bSespie {
425*a1acfa9bSespie if (pathname[orig_prefix_len] == '\0')
426*a1acfa9bSespie /* pathname equals orig_prefix. */
427*a1acfa9bSespie return curr_prefix;
428*a1acfa9bSespie if (ISSLASH (pathname[orig_prefix_len]))
429*a1acfa9bSespie {
430*a1acfa9bSespie /* pathname starts with orig_prefix. */
431*a1acfa9bSespie const char *pathname_tail = &pathname[orig_prefix_len];
432*a1acfa9bSespie char *result =
433*a1acfa9bSespie (char *) xmalloc (curr_prefix_len + strlen (pathname_tail) + 1);
434*a1acfa9bSespie
435*a1acfa9bSespie #ifdef NO_XMALLOC
436*a1acfa9bSespie if (result != NULL)
437*a1acfa9bSespie #endif
438*a1acfa9bSespie {
439*a1acfa9bSespie memcpy (result, curr_prefix, curr_prefix_len);
440*a1acfa9bSespie strcpy (result + curr_prefix_len, pathname_tail);
441*a1acfa9bSespie return result;
442*a1acfa9bSespie }
443*a1acfa9bSespie }
444*a1acfa9bSespie }
445*a1acfa9bSespie /* Nothing to relocate. */
446*a1acfa9bSespie return pathname;
447*a1acfa9bSespie }
448*a1acfa9bSespie
449*a1acfa9bSespie #endif
450