Mercurial > hg > CbC > CbC_gcc
annotate libiberty/make-relative-prefix.c @ 108:7ad14f446135
add CbC-example/rectypeTest/
author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
---|---|
date | Thu, 14 Jun 2012 20:30:24 +0900 |
parents | f6334be47118 |
children | 04ced10e8804 |
rev | line source |
---|---|
0 | 1 /* Relative (relocatable) prefix support. |
2 Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, | |
3 1999, 2000, 2001, 2002, 2006 Free Software Foundation, Inc. | |
4 | |
5 This file is part of libiberty. | |
6 | |
7 GCC is free software; you can redistribute it and/or modify it under | |
8 the terms of the GNU General Public License as published by the Free | |
9 Software Foundation; either version 2, or (at your option) any later | |
10 version. | |
11 | |
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING. If not, write to the Free | |
19 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA | |
20 02110-1301, USA. */ | |
21 | |
22 /* | |
23 | |
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
24 @deftypefn Extension {const char*} make_relative_prefix (const char *@var{progname}, @ |
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
25 const char *@var{bin_prefix}, const char *@var{prefix}) |
0 | 26 |
27 Given three paths @var{progname}, @var{bin_prefix}, @var{prefix}, | |
28 return the path that is in the same position relative to | |
29 @var{progname}'s directory as @var{prefix} is relative to | |
30 @var{bin_prefix}. That is, a string starting with the directory | |
31 portion of @var{progname}, followed by a relative pathname of the | |
32 difference between @var{bin_prefix} and @var{prefix}. | |
33 | |
34 If @var{progname} does not contain any directory separators, | |
35 @code{make_relative_prefix} will search @env{PATH} to find a program | |
36 named @var{progname}. Also, if @var{progname} is a symbolic link, | |
37 the symbolic link will be resolved. | |
38 | |
39 For example, if @var{bin_prefix} is @code{/alpha/beta/gamma/gcc/delta}, | |
40 @var{prefix} is @code{/alpha/beta/gamma/omega/}, and @var{progname} is | |
41 @code{/red/green/blue/gcc}, then this function will return | |
42 @code{/red/green/blue/../../omega/}. | |
43 | |
44 The return value is normally allocated via @code{malloc}. If no | |
45 relative prefix can be found, return @code{NULL}. | |
46 | |
47 @end deftypefn | |
48 | |
49 */ | |
50 | |
51 #ifdef HAVE_CONFIG_H | |
52 #include "config.h" | |
53 #endif | |
54 | |
55 #ifdef HAVE_STDLIB_H | |
56 #include <stdlib.h> | |
57 #endif | |
58 #ifdef HAVE_UNISTD_H | |
59 #include <unistd.h> | |
60 #endif | |
61 | |
62 #include <string.h> | |
63 | |
64 #include "ansidecl.h" | |
65 #include "libiberty.h" | |
66 | |
67 #ifndef R_OK | |
68 #define R_OK 4 | |
69 #define W_OK 2 | |
70 #define X_OK 1 | |
71 #endif | |
72 | |
73 #ifndef DIR_SEPARATOR | |
74 # define DIR_SEPARATOR '/' | |
75 #endif | |
76 | |
77 #if defined (_WIN32) || defined (__MSDOS__) \ | |
78 || defined (__DJGPP__) || defined (__OS2__) | |
79 # define HAVE_DOS_BASED_FILE_SYSTEM | |
80 # define HAVE_HOST_EXECUTABLE_SUFFIX | |
81 # define HOST_EXECUTABLE_SUFFIX ".exe" | |
82 # ifndef DIR_SEPARATOR_2 | |
83 # define DIR_SEPARATOR_2 '\\' | |
84 # endif | |
85 # define PATH_SEPARATOR ';' | |
86 #else | |
87 # define PATH_SEPARATOR ':' | |
88 #endif | |
89 | |
90 #ifndef DIR_SEPARATOR_2 | |
91 # define IS_DIR_SEPARATOR(ch) ((ch) == DIR_SEPARATOR) | |
92 #else | |
93 # define IS_DIR_SEPARATOR(ch) \ | |
94 (((ch) == DIR_SEPARATOR) || ((ch) == DIR_SEPARATOR_2)) | |
95 #endif | |
96 | |
97 #define DIR_UP ".." | |
98 | |
99 static char *save_string (const char *, int); | |
100 static char **split_directories (const char *, int *); | |
101 static void free_split_directories (char **); | |
102 | |
103 static char * | |
104 save_string (const char *s, int len) | |
105 { | |
106 char *result = (char *) malloc (len + 1); | |
107 | |
108 memcpy (result, s, len); | |
109 result[len] = 0; | |
110 return result; | |
111 } | |
112 | |
113 /* Split a filename into component directories. */ | |
114 | |
115 static char ** | |
116 split_directories (const char *name, int *ptr_num_dirs) | |
117 { | |
118 int num_dirs = 0; | |
119 char **dirs; | |
120 const char *p, *q; | |
121 int ch; | |
122 | |
123 /* Count the number of directories. Special case MSDOS disk names as part | |
124 of the initial directory. */ | |
125 p = name; | |
126 #ifdef HAVE_DOS_BASED_FILE_SYSTEM | |
127 if (name[1] == ':' && IS_DIR_SEPARATOR (name[2])) | |
128 { | |
129 p += 3; | |
130 num_dirs++; | |
131 } | |
132 #endif /* HAVE_DOS_BASED_FILE_SYSTEM */ | |
133 | |
134 while ((ch = *p++) != '\0') | |
135 { | |
136 if (IS_DIR_SEPARATOR (ch)) | |
137 { | |
138 num_dirs++; | |
139 while (IS_DIR_SEPARATOR (*p)) | |
140 p++; | |
141 } | |
142 } | |
143 | |
144 dirs = (char **) malloc (sizeof (char *) * (num_dirs + 2)); | |
145 if (dirs == NULL) | |
146 return NULL; | |
147 | |
148 /* Now copy the directory parts. */ | |
149 num_dirs = 0; | |
150 p = name; | |
151 #ifdef HAVE_DOS_BASED_FILE_SYSTEM | |
152 if (name[1] == ':' && IS_DIR_SEPARATOR (name[2])) | |
153 { | |
154 dirs[num_dirs++] = save_string (p, 3); | |
155 if (dirs[num_dirs - 1] == NULL) | |
156 { | |
157 free (dirs); | |
158 return NULL; | |
159 } | |
160 p += 3; | |
161 } | |
162 #endif /* HAVE_DOS_BASED_FILE_SYSTEM */ | |
163 | |
164 q = p; | |
165 while ((ch = *p++) != '\0') | |
166 { | |
167 if (IS_DIR_SEPARATOR (ch)) | |
168 { | |
169 while (IS_DIR_SEPARATOR (*p)) | |
170 p++; | |
171 | |
172 dirs[num_dirs++] = save_string (q, p - q); | |
173 if (dirs[num_dirs - 1] == NULL) | |
174 { | |
175 dirs[num_dirs] = NULL; | |
176 free_split_directories (dirs); | |
177 return NULL; | |
178 } | |
179 q = p; | |
180 } | |
181 } | |
182 | |
183 if (p - 1 - q > 0) | |
184 dirs[num_dirs++] = save_string (q, p - 1 - q); | |
185 dirs[num_dirs] = NULL; | |
186 | |
187 if (dirs[num_dirs - 1] == NULL) | |
188 { | |
189 free_split_directories (dirs); | |
190 return NULL; | |
191 } | |
192 | |
193 if (ptr_num_dirs) | |
194 *ptr_num_dirs = num_dirs; | |
195 return dirs; | |
196 } | |
197 | |
198 /* Release storage held by split directories. */ | |
199 | |
200 static void | |
201 free_split_directories (char **dirs) | |
202 { | |
203 int i = 0; | |
204 | |
205 if (dirs != NULL) | |
206 { | |
207 while (dirs[i] != NULL) | |
208 free (dirs[i++]); | |
209 | |
210 free ((char *) dirs); | |
211 } | |
212 } | |
213 | |
214 /* Given three strings PROGNAME, BIN_PREFIX, PREFIX, return a string that gets | |
215 to PREFIX starting with the directory portion of PROGNAME and a relative | |
216 pathname of the difference between BIN_PREFIX and PREFIX. | |
217 | |
218 For example, if BIN_PREFIX is /alpha/beta/gamma/gcc/delta, PREFIX is | |
219 /alpha/beta/gamma/omega/, and PROGNAME is /red/green/blue/gcc, then this | |
220 function will return /red/green/blue/../../omega/. | |
221 | |
222 If no relative prefix can be found, return NULL. */ | |
223 | |
224 static char * | |
225 make_relative_prefix_1 (const char *progname, const char *bin_prefix, | |
226 const char *prefix, const int resolve_links) | |
227 { | |
228 char **prog_dirs = NULL, **bin_dirs = NULL, **prefix_dirs = NULL; | |
229 int prog_num, bin_num, prefix_num; | |
230 int i, n, common; | |
231 int needed_len; | |
232 char *ret = NULL, *ptr, *full_progname; | |
233 | |
234 if (progname == NULL || bin_prefix == NULL || prefix == NULL) | |
235 return NULL; | |
236 | |
237 /* If there is no full pathname, try to find the program by checking in each | |
238 of the directories specified in the PATH environment variable. */ | |
239 if (lbasename (progname) == progname) | |
240 { | |
241 char *temp; | |
242 | |
243 temp = getenv ("PATH"); | |
244 if (temp) | |
245 { | |
246 char *startp, *endp, *nstore; | |
247 size_t prefixlen = strlen (temp) + 1; | |
248 if (prefixlen < 2) | |
249 prefixlen = 2; | |
250 | |
251 nstore = (char *) alloca (prefixlen + strlen (progname) + 1); | |
252 | |
253 startp = endp = temp; | |
254 while (1) | |
255 { | |
256 if (*endp == PATH_SEPARATOR || *endp == 0) | |
257 { | |
258 if (endp == startp) | |
259 { | |
260 nstore[0] = '.'; | |
261 nstore[1] = DIR_SEPARATOR; | |
262 nstore[2] = '\0'; | |
263 } | |
264 else | |
265 { | |
266 strncpy (nstore, startp, endp - startp); | |
267 if (! IS_DIR_SEPARATOR (endp[-1])) | |
268 { | |
269 nstore[endp - startp] = DIR_SEPARATOR; | |
270 nstore[endp - startp + 1] = 0; | |
271 } | |
272 else | |
273 nstore[endp - startp] = 0; | |
274 } | |
275 strcat (nstore, progname); | |
276 if (! access (nstore, X_OK) | |
277 #ifdef HAVE_HOST_EXECUTABLE_SUFFIX | |
278 || ! access (strcat (nstore, HOST_EXECUTABLE_SUFFIX), X_OK) | |
279 #endif | |
280 ) | |
281 { | |
282 progname = nstore; | |
283 break; | |
284 } | |
285 | |
286 if (*endp == 0) | |
287 break; | |
288 endp = startp = endp + 1; | |
289 } | |
290 else | |
291 endp++; | |
292 } | |
293 } | |
294 } | |
295 | |
296 if (resolve_links) | |
297 full_progname = lrealpath (progname); | |
298 else | |
299 full_progname = strdup (progname); | |
300 if (full_progname == NULL) | |
301 return NULL; | |
302 | |
303 prog_dirs = split_directories (full_progname, &prog_num); | |
304 free (full_progname); | |
305 if (prog_dirs == NULL) | |
306 return NULL; | |
307 | |
308 bin_dirs = split_directories (bin_prefix, &bin_num); | |
309 if (bin_dirs == NULL) | |
310 goto bailout; | |
311 | |
312 /* Remove the program name from comparison of directory names. */ | |
313 prog_num--; | |
314 | |
315 /* If we are still installed in the standard location, we don't need to | |
316 specify relative directories. Also, if argv[0] still doesn't contain | |
317 any directory specifiers after the search above, then there is not much | |
318 we can do. */ | |
319 if (prog_num == bin_num) | |
320 { | |
321 for (i = 0; i < bin_num; i++) | |
322 { | |
323 if (strcmp (prog_dirs[i], bin_dirs[i]) != 0) | |
324 break; | |
325 } | |
326 | |
327 if (prog_num <= 0 || i == bin_num) | |
328 goto bailout; | |
329 } | |
330 | |
331 prefix_dirs = split_directories (prefix, &prefix_num); | |
332 if (prefix_dirs == NULL) | |
333 goto bailout; | |
334 | |
335 /* Find how many directories are in common between bin_prefix & prefix. */ | |
336 n = (prefix_num < bin_num) ? prefix_num : bin_num; | |
337 for (common = 0; common < n; common++) | |
338 { | |
339 if (strcmp (bin_dirs[common], prefix_dirs[common]) != 0) | |
340 break; | |
341 } | |
342 | |
343 /* If there are no common directories, there can be no relative prefix. */ | |
344 if (common == 0) | |
345 goto bailout; | |
346 | |
347 /* Two passes: first figure out the size of the result string, and | |
348 then construct it. */ | |
349 needed_len = 0; | |
350 for (i = 0; i < prog_num; i++) | |
351 needed_len += strlen (prog_dirs[i]); | |
352 needed_len += sizeof (DIR_UP) * (bin_num - common); | |
353 for (i = common; i < prefix_num; i++) | |
354 needed_len += strlen (prefix_dirs[i]); | |
355 needed_len += 1; /* Trailing NUL. */ | |
356 | |
357 ret = (char *) malloc (needed_len); | |
358 if (ret == NULL) | |
359 goto bailout; | |
360 | |
361 /* Build up the pathnames in argv[0]. */ | |
362 *ret = '\0'; | |
363 for (i = 0; i < prog_num; i++) | |
364 strcat (ret, prog_dirs[i]); | |
365 | |
366 /* Now build up the ..'s. */ | |
367 ptr = ret + strlen(ret); | |
368 for (i = common; i < bin_num; i++) | |
369 { | |
370 strcpy (ptr, DIR_UP); | |
371 ptr += sizeof (DIR_UP) - 1; | |
372 *(ptr++) = DIR_SEPARATOR; | |
373 } | |
374 *ptr = '\0'; | |
375 | |
376 /* Put in directories to move over to prefix. */ | |
377 for (i = common; i < prefix_num; i++) | |
378 strcat (ret, prefix_dirs[i]); | |
379 | |
380 bailout: | |
381 free_split_directories (prog_dirs); | |
382 free_split_directories (bin_dirs); | |
383 free_split_directories (prefix_dirs); | |
384 | |
385 return ret; | |
386 } | |
387 | |
388 | |
389 /* Do the full job, including symlink resolution. | |
390 This path will find files installed in the same place as the | |
391 program even when a soft link has been made to the program | |
392 from somwhere else. */ | |
393 | |
394 char * | |
395 make_relative_prefix (const char *progname, const char *bin_prefix, | |
396 const char *prefix) | |
397 { | |
398 return make_relative_prefix_1 (progname, bin_prefix, prefix, 1); | |
399 } | |
400 | |
401 /* Make the relative pathname without attempting to resolve any links. | |
402 '..' etc may also be left in the pathname. | |
403 This will find the files the user meant the program to find if the | |
404 installation is patched together with soft links. */ | |
405 | |
406 char * | |
407 make_relative_prefix_ignore_links (const char *progname, | |
408 const char *bin_prefix, | |
409 const char *prefix) | |
410 { | |
411 return make_relative_prefix_1 (progname, bin_prefix, prefix, 0); | |
412 } | |
413 |