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Commitbffe45a

Browse files
committed
Simplify relative-path logic, on the assumption that compiled-in paths
won't have trivial differences in their common prefix.
1 parent04baa0e commitbffe45a

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1 file changed

+65
-163
lines changed

1 file changed

+65
-163
lines changed

‎src/port/path.c

Lines changed: 65 additions & 163 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/port/path.c,v 1.43 2004/11/0604:24:14 tgl Exp $
11+
* $PostgreSQL: pgsql/src/port/path.c,v 1.44 2004/11/0621:39:45 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -32,17 +32,11 @@
3232
#defineIS_PATH_SEP(ch) ((ch) == ';')
3333
#endif
3434

35-
staticconstchar*relative_path(constchar*bin_path,constchar*other_path);
36-
staticvoidmake_relative(constchar*my_exec_path,constchar*p,char*ret_path);
35+
staticvoidmake_relative_path(char*ret_path,constchar*target_path,
36+
constchar*bin_path,constchar*my_exec_path);
3737
staticvoidtrim_directory(char*path);
3838
staticvoidtrim_trailing_separator(char*path);
3939

40-
/* Move to last of consecutive separators or to null byte */
41-
#defineMOVE_TO_SEP_END(p) \
42-
{ \
43-
while (IS_DIR_SEP((p)[0]) && (IS_DIR_SEP((p)[1]) || !(p)[1])) \
44-
(p)++; \
45-
}
4640

4741
/*
4842
* skip_drive
@@ -252,11 +246,11 @@ canonicalize_path(char *path)
252246
{
253247
intlen=strlen(path);
254248

255-
if (len >=2&&strcmp(path+len-2,"/.")==0)
249+
if (len>2&&strcmp(path+len-2,"/.")==0)
256250
{
257251
trim_directory(path);
258252
}
259-
elseif (len >=3&&strcmp(path+len-3,"/..")==0)
253+
elseif (len>3&&strcmp(path+len-3,"/..")==0)
260254
{
261255
trim_directory(path);
262256
trim_directory(path);/* remove directory above */
@@ -305,132 +299,123 @@ get_progname(const char *argv0)
305299

306300

307301
/*
308-
*get_share_path
302+
* make_relative_path - make a path relative to the actual binary location
303+
*
304+
* This function exists to support relocation of installation trees.
305+
*
306+
*ret_path is the output area (must be of size MAXPGPATH)
307+
*target_path is the compiled-in path to the directory we want to find
308+
*bin_path is the compiled-in path to the directory of executables
309+
*my_exec_path is the actual location of my executable
310+
*
311+
* If target_path matches bin_path up to the last directory component of
312+
* bin_path, then we build the result as my_exec_path (less the executable
313+
* name and last directory) joined to the non-matching part of target_path.
314+
* Otherwise, we return target_path as-is.
315+
*
316+
* For example:
317+
*target_path = '/usr/local/share/postgresql'
318+
*bin_path = '/usr/local/bin'
319+
*my_exec_path = '/opt/pgsql/bin/postmaster'
320+
* Given these inputs we would return '/opt/pgsql/share/postgresql'
309321
*/
310-
void
311-
get_share_path(constchar*my_exec_path,char*ret_path)
322+
staticvoid
323+
make_relative_path(char*ret_path,constchar*target_path,
324+
constchar*bin_path,constchar*my_exec_path)
312325
{
313-
constchar*p;
326+
constchar*bin_end;
327+
intprefix_len;
328+
329+
bin_end=last_dir_separator(bin_path);
330+
if (!bin_end)
331+
gotono_match;
332+
prefix_len=bin_end-bin_path+1;
333+
if (strncmp(target_path,bin_path,prefix_len)!=0)
334+
gotono_match;
335+
336+
StrNCpy(ret_path,my_exec_path,MAXPGPATH);
337+
trim_directory(ret_path);/* remove my executable name */
338+
trim_directory(ret_path);/* remove last directory component (/bin) */
339+
join_path_components(ret_path,ret_path,target_path+prefix_len);
340+
canonicalize_path(ret_path);
341+
return;
314342

315-
if ((p=relative_path(PGBINDIR,PGSHAREDIR)))
316-
make_relative(my_exec_path,p,ret_path);
317-
else
318-
StrNCpy(ret_path,PGSHAREDIR,MAXPGPATH);
343+
no_match:
344+
StrNCpy(ret_path,target_path,MAXPGPATH);
319345
canonicalize_path(ret_path);
320346
}
321347

322348

349+
/*
350+
*get_share_path
351+
*/
352+
void
353+
get_share_path(constchar*my_exec_path,char*ret_path)
354+
{
355+
make_relative_path(ret_path,PGSHAREDIR,PGBINDIR,my_exec_path);
356+
}
357+
323358
/*
324359
*get_etc_path
325360
*/
326361
void
327362
get_etc_path(constchar*my_exec_path,char*ret_path)
328363
{
329-
constchar*p;
330-
331-
if ((p=relative_path(PGBINDIR,SYSCONFDIR)))
332-
make_relative(my_exec_path,p,ret_path);
333-
else
334-
StrNCpy(ret_path,SYSCONFDIR,MAXPGPATH);
335-
canonicalize_path(ret_path);
364+
make_relative_path(ret_path,SYSCONFDIR,PGBINDIR,my_exec_path);
336365
}
337366

338-
339367
/*
340368
*get_include_path
341369
*/
342370
void
343371
get_include_path(constchar*my_exec_path,char*ret_path)
344372
{
345-
constchar*p;
346-
347-
if ((p=relative_path(PGBINDIR,INCLUDEDIR)))
348-
make_relative(my_exec_path,p,ret_path);
349-
else
350-
StrNCpy(ret_path,INCLUDEDIR,MAXPGPATH);
351-
canonicalize_path(ret_path);
373+
make_relative_path(ret_path,INCLUDEDIR,PGBINDIR,my_exec_path);
352374
}
353375

354-
355376
/*
356377
*get_pkginclude_path
357378
*/
358379
void
359380
get_pkginclude_path(constchar*my_exec_path,char*ret_path)
360381
{
361-
constchar*p;
362-
363-
if ((p=relative_path(PGBINDIR,PKGINCLUDEDIR)))
364-
make_relative(my_exec_path,p,ret_path);
365-
else
366-
StrNCpy(ret_path,PKGINCLUDEDIR,MAXPGPATH);
367-
canonicalize_path(ret_path);
382+
make_relative_path(ret_path,PKGINCLUDEDIR,PGBINDIR,my_exec_path);
368383
}
369384

370-
371385
/*
372386
*get_includeserver_path
373387
*/
374388
void
375389
get_includeserver_path(constchar*my_exec_path,char*ret_path)
376390
{
377-
constchar*p;
378-
379-
if ((p=relative_path(PGBINDIR,INCLUDEDIRSERVER)))
380-
make_relative(my_exec_path,p,ret_path);
381-
else
382-
StrNCpy(ret_path,INCLUDEDIRSERVER,MAXPGPATH);
383-
canonicalize_path(ret_path);
391+
make_relative_path(ret_path,INCLUDEDIRSERVER,PGBINDIR,my_exec_path);
384392
}
385393

386-
387394
/*
388395
*get_lib_path
389396
*/
390397
void
391398
get_lib_path(constchar*my_exec_path,char*ret_path)
392399
{
393-
constchar*p;
394-
395-
if ((p=relative_path(PGBINDIR,LIBDIR)))
396-
make_relative(my_exec_path,p,ret_path);
397-
else
398-
StrNCpy(ret_path,LIBDIR,MAXPGPATH);
399-
canonicalize_path(ret_path);
400+
make_relative_path(ret_path,LIBDIR,PGBINDIR,my_exec_path);
400401
}
401402

402-
403403
/*
404404
*get_pkglib_path
405405
*/
406406
void
407407
get_pkglib_path(constchar*my_exec_path,char*ret_path)
408408
{
409-
constchar*p;
410-
411-
if ((p=relative_path(PGBINDIR,PKGLIBDIR)))
412-
make_relative(my_exec_path,p,ret_path);
413-
else
414-
StrNCpy(ret_path,PKGLIBDIR,MAXPGPATH);
415-
canonicalize_path(ret_path);
409+
make_relative_path(ret_path,PKGLIBDIR,PGBINDIR,my_exec_path);
416410
}
417411

418-
419412
/*
420413
*get_locale_path
421-
*
422-
*Return locale path, either relative to /bin or hardcoded
423414
*/
424415
void
425416
get_locale_path(constchar*my_exec_path,char*ret_path)
426417
{
427-
constchar*p;
428-
429-
if ((p=relative_path(PGBINDIR,LOCALEDIR)))
430-
make_relative(my_exec_path,p,ret_path);
431-
else
432-
StrNCpy(ret_path,LOCALEDIR,MAXPGPATH);
433-
canonicalize_path(ret_path);
418+
make_relative_path(ret_path,LOCALEDIR,PGBINDIR,my_exec_path);
434419
}
435420

436421

@@ -440,14 +425,16 @@ get_locale_path(const char *my_exec_path, char *ret_path)
440425
bool
441426
get_home_path(char*ret_path)
442427
{
443-
if (getenv(HOMEDIR)==NULL)
428+
constchar*homedir=getenv(HOMEDIR);
429+
430+
if (homedir==NULL)
444431
{
445432
*ret_path='\0';
446433
return false;
447434
}
448435
else
449436
{
450-
StrNCpy(ret_path,getenv(HOMEDIR),MAXPGPATH);
437+
StrNCpy(ret_path,homedir,MAXPGPATH);
451438
canonicalize_path(ret_path);
452439
return true;
453440
}
@@ -515,91 +502,6 @@ set_pglocale_pgservice(const char *argv0, const char *app)
515502
}
516503

517504

518-
/*
519-
*make_relative - adjust path to be relative to bin/
520-
*
521-
* ret_path is the output area (must be of size MAXPGPATH)
522-
*/
523-
staticvoid
524-
make_relative(constchar*my_exec_path,constchar*p,char*ret_path)
525-
{
526-
charpath[MAXPGPATH];
527-
528-
StrNCpy(path,my_exec_path,MAXPGPATH);
529-
trim_directory(path);/* remove my executable name */
530-
trim_directory(path);/* remove last directory component (/bin) */
531-
join_path_components(ret_path,path,p);
532-
}
533-
534-
535-
/*
536-
*relative_path
537-
*
538-
*Do the supplied paths differ only in their last component?
539-
*/
540-
staticconstchar*
541-
relative_path(constchar*bin_path,constchar*other_path)
542-
{
543-
#ifdefWIN32
544-
/* Driver letters match? */
545-
if (isalpha(*bin_path)&&bin_path[1]==':'&&
546-
(!isalpha(*other_path)|| !other_path[1]==':'))
547-
returnNULL;
548-
if ((!isalpha(*bin_path)|| !bin_path[1]==':')&&
549-
(isalpha(*other_path)&&other_path[1]==':'))
550-
returnNULL;
551-
if (isalpha(*bin_path)&&bin_path[1]==':'&&
552-
isalpha(*other_path)&&other_path[1]==':')
553-
{
554-
if (toupper(*bin_path)!=toupper(*other_path))
555-
returnNULL;
556-
bin_path+=2;
557-
other_path+=2;
558-
}
559-
#endif
560-
561-
while (1)
562-
{
563-
/* Move past adjacent slashes like //, and trailing ones */
564-
MOVE_TO_SEP_END(bin_path);
565-
MOVE_TO_SEP_END(other_path);
566-
567-
/* One of the paths is done? */
568-
if (!*bin_path|| !*other_path)
569-
break;
570-
571-
/* Win32 filesystem is case insensitive */
572-
if ((!IS_DIR_SEP(*bin_path)|| !IS_DIR_SEP(*other_path))&&
573-
#ifndefWIN32
574-
*bin_path!=*other_path
575-
#else
576-
toupper((unsignedchar)*bin_path)!=toupper((unsignedchar)*other_path)
577-
#endif
578-
)
579-
break;
580-
581-
bin_path++;
582-
other_path++;
583-
}
584-
585-
/* identical? */
586-
if (!*bin_path&& !*other_path)
587-
returnNULL;
588-
589-
/* advance past directory name */
590-
while (!IS_DIR_SEP(*bin_path)&&*bin_path)
591-
bin_path++;
592-
593-
MOVE_TO_SEP_END(bin_path);
594-
595-
/* Is bin done? */
596-
if (!*bin_path)
597-
returnother_path;
598-
else
599-
returnNULL;
600-
}
601-
602-
603505
/*
604506
*trim_directory
605507
*

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