/* Relative (relocatable) prefix support.
Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2006 Free Software Foundation, Inc.
This file is part of libiberty.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
+02110-1301, USA. */
/*
@deftypefn Extension {const char*} make_relative_prefix (const char *@var{progname}, const char *@var{bin_prefix}, const char *@var{prefix})
-Given three strings @var{progname}, @var{bin_prefix}, @var{prefix}, return a string
-that gets to @var{prefix} starting with the directory portion of @var{progname} and
-a relative pathname of the difference between @var{bin_prefix} and @var{prefix}.
+Given three paths @var{progname}, @var{bin_prefix}, @var{prefix},
+return the path that is in the same position relative to
+@var{progname}'s directory as @var{prefix} is relative to
+@var{bin_prefix}. That is, a string starting with the directory
+portion of @var{progname}, followed by a relative pathname of the
+difference between @var{bin_prefix} and @var{prefix}.
-For example, if @var{bin_prefix} is @code{/alpha/beta/gamma/gcc/delta}, @var{prefix}
-is @code{/alpha/beta/gamma/omega/}, and @var{progname} is @code{/red/green/blue/gcc},
-then this function will return @code{/red/green/blue/../../omega/}.
+If @var{progname} does not contain any directory separators,
+@code{make_relative_prefix} will search @env{PATH} to find a program
+named @var{progname}. Also, if @var{progname} is a symbolic link,
+the symbolic link will be resolved.
-The return value is normally allocated via @code{malloc}. If no relative prefix
-can be found, return @code{NULL}.
+For example, if @var{bin_prefix} is @code{/alpha/beta/gamma/gcc/delta},
+@var{prefix} is @code{/alpha/beta/gamma/omega/}, and @var{progname} is
+@code{/red/green/blue/gcc}, then this function will return
+@code{/red/green/blue/../../omega/}.
+
+The return value is normally allocated via @code{malloc}. If no
+relative prefix can be found, return @code{NULL}.
@end deftypefn
#define DIR_UP ".."
-static char *save_string PARAMS ((const char *, int));
-static char **split_directories PARAMS ((const char *, int *));
-static void free_split_directories PARAMS ((char **));
+static char *save_string (const char *, int);
+static char **split_directories (const char *, int *);
+static void free_split_directories (char **);
static char *
-save_string (s, len)
- const char *s;
- int len;
+save_string (const char *s, int len)
{
- char *result = malloc (len + 1);
+ char *result = (char *) malloc (len + 1);
memcpy (result, s, len);
result[len] = 0;
/* Split a filename into component directories. */
static char **
-split_directories (name, ptr_num_dirs)
- const char *name;
- int *ptr_num_dirs;
+split_directories (const char *name, int *ptr_num_dirs)
{
int num_dirs = 0;
char **dirs;
/* Release storage held by split directories. */
static void
-free_split_directories (dirs)
- char **dirs;
+free_split_directories (char **dirs)
{
int i = 0;
If no relative prefix can be found, return NULL. */
-char *
-make_relative_prefix (progname, bin_prefix, prefix)
- const char *progname;
- const char *bin_prefix;
- const char *prefix;
+static char *
+make_relative_prefix_1 (const char *progname, const char *bin_prefix,
+ const char *prefix, const int resolve_links)
{
char **prog_dirs, **bin_dirs, **prefix_dirs;
int prog_num, bin_num, prefix_num;
int i, n, common;
int needed_len;
- char *ret, *ptr;
+ char *ret, *ptr, *full_progname = NULL;
if (progname == NULL || bin_prefix == NULL || prefix == NULL)
return NULL;
- prog_dirs = split_directories (progname, &prog_num);
- bin_dirs = split_directories (bin_prefix, &bin_num);
- if (bin_dirs == NULL || prog_dirs == NULL)
- return NULL;
-
/* If there is no full pathname, try to find the program by checking in each
of the directories specified in the PATH environment variable. */
- if (prog_num == 1)
+ if (lbasename (progname) == progname)
{
char *temp;
#endif
)
{
- free_split_directories (prog_dirs);
progname = nstore;
- prog_dirs = split_directories (progname, &prog_num);
- if (prog_dirs == NULL)
- {
- free_split_directories (bin_dirs);
- return NULL;
- }
break;
}
}
}
+ if ( resolve_links )
+ {
+ full_progname = lrealpath (progname);
+ if (full_progname == NULL)
+ return NULL;
+ }
+ else
+ full_progname = strdup(progname);
+
+ prog_dirs = split_directories (full_progname, &prog_num);
+ bin_dirs = split_directories (bin_prefix, &bin_num);
+ free (full_progname);
+ if (bin_dirs == NULL || prog_dirs == NULL)
+ return NULL;
+
/* Remove the program name from comparison of directory names. */
prog_num--;
return ret;
}
+
+
+/* Do the full job, including symlink resolution.
+ This path will find files installed in the same place as the
+ program even when a soft link has been made to the program
+ from somwhere else. */
+
+char *
+make_relative_prefix (progname, bin_prefix, prefix)
+ const char *progname;
+ const char *bin_prefix;
+ const char *prefix;
+{
+ return make_relative_prefix_1 (progname, bin_prefix, prefix, 1);
+}
+
+/* Make the relative pathname without attempting to resolve any links.
+ '..' etc may also be left in the pathname.
+ This will find the files the user meant the program to find if the
+ installation is patched together with soft links. */
+
+char *
+make_relative_prefix_ignore_links (progname, bin_prefix, prefix)
+ const char *progname;
+ const char *bin_prefix;
+ const char *prefix;
+{
+ return make_relative_prefix_1 (progname, bin_prefix, prefix, 0);
+}
+
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