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2002-11-12 Andrew Cagney <ac131313@redhat.com>

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* utils.c (gdb_realpath): Rewrite.  Try, in order: realpath() with
	a constant buffer; cannonicalize_file_name(); realpath() with a
	pathconf() defined buffer, xstrdup().
This commit is contained in:
Andrew Cagney 2002-11-12 17:19:06 +00:00
parent 9835a8b012
commit 70d358198f
2 changed files with 55 additions and 16 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2002-11-12 Andrew Cagney <ac131313@redhat.com>
* utils.c (gdb_realpath): Rewrite. Try, in order: realpath() with
a constant buffer; cannonicalize_file_name(); realpath() with a
pathconf() defined buffer, xstrdup().
2002-11-12 Andrew Cagney <ac131313@redhat.com>
* config/djgpp/fnchange.lst: Fix typo, hang1.c to hang1.C; hang2.c

65
gdb/utils.c
View File

@ -2704,31 +2704,64 @@ string_to_core_addr (const char *my_string)
char *
gdb_realpath (const char *filename)
{
/* Method 1: The system has a compile time upper bound on a filename
path. Use that and realpath() to canonicalize the name. This is
the most common case. Note that, if there isn't a compile time
upper bound, you want to avoid realpath() at all costs. */
#if defined(HAVE_REALPATH)
{
# if defined (PATH_MAX)
char buf[PATH_MAX];
char buf[PATH_MAX];
# define USE_REALPATH
# elif defined (MAXPATHLEN)
char buf[MAXPATHLEN];
# define USE_REALPATH
# elif defined (HAVE_UNISTD_H) && defined(HAVE_ALLOCA)
char *buf = alloca ((size_t)pathconf ("/", _PC_PATH_MAX));
char buf[MAXPATHLEN];
# define USE_REALPATH
# endif
# if defined (USE_REALPATH)
char *rp = realpath (filename, buf);
if (rp == NULL)
rp = filename;
return xstrdup (rp);
}
# endif
#endif /* HAVE_REALPATH */
#if defined(USE_REALPATH)
char *rp = realpath (filename, buf);
return xstrdup (rp ? rp : filename);
#elif defined(HAVE_CANONICALIZE_FILE_NAME)
char *rp = canonicalize_file_name (filename);
if (rp == NULL)
return xstrdup (filename);
else
return rp;
#else
return xstrdup (filename);
/* Method 2: The host system (i.e., GNU) has the function
canonicalize_file_name() which malloc's a chunk of memory and
returns that, use that. */
#if defined(HAVE_CANONICALIZE_FILE_NAME)
{
char *rp = canonicalize_file_name (filename);
if (rp == NULL)
return xstrdup (filename);
else
return rp;
}
#endif
/* Method 3: Now we're getting desperate! The system doesn't have a
compile time buffer size and no alternative function. Query the
OS, using pathconf(), for the buffer limit. Care is needed
though, some systems do not limit PATH_MAX (return -1 for
pathconf()) making it impossible to pass a correctly sized buffer
to realpath() (it could always overflow). On those systems, we
skip this. */
#if defined (HAVE_REALPATH) && defined (HAVE_UNISTD_H) && defined(HAVE_ALLOCA)
{
/* Find out the max path size. */
long path_max = pathconf ("/", _PC_PATH_MAX);
if (path_max > 0)
{
/* PATH_MAX is bounded. */
char *buf = alloca (path_max);
char *rp = realpath (filename, buf);
return xstrdup (rp ? rp : filename);
}
}
#endif
/* This system is a lost cause, just dup the buffer. */
return xstrdup (filename);
}
/* Return a copy of FILENAME, with its directory prefix canonicalized