-/* Substitutes $variables in SRC, putting the result in DST,
- properly handling the case where SRC is a substring of DST.
- Variables are as defined by GETENV. Supports $var and ${var}
- syntaxes; $$ substitutes as $. */
-void
-fn_interp_vars (struct substring src, const char *(*getenv) (const char *),
- struct string *dst_)
-{
- struct string dst = DS_EMPTY_INITIALIZER;
- int c;
-
- while ((c = ss_get_char (&src)) != EOF)
- if (c != '$')
- ds_put_char (&dst, c);
- else
- {
- if (ss_match_char (&src, '$') || ss_is_empty (src))
- ds_put_char (&dst, '$');
- else
- {
- struct substring var_name;
- size_t start;
- const char *value;
-
- if (ss_match_char (&src, '('))
- ss_get_until (&src, ')', &var_name);
- else if (ss_match_char (&src, '{'))
- ss_get_until (&src, '}', &var_name);
- else
- ss_get_chars (&src, MIN (1, ss_span (src, ss_cstr (CC_ALNUM))),
- &var_name);
-
- start = ds_length (&dst);
- ds_put_substring (&dst, var_name);
- value = getenv (ds_cstr (&dst) + start);
- ds_truncate (&dst, start);
-
- ds_put_cstr (&dst, value);
- }
- }
-
- ds_swap (&dst, dst_);
- ds_destroy (&dst);
-}
-
-#ifdef unix
-/* Expands csh tilde notation from the path INPUT into a malloc()'d
- returned string. */
-char *
-fn_tilde_expand (const char *input)
-{
- struct string output = DS_EMPTY_INITIALIZER;
- if (input[0] == '~')
- {
- const char *home = NULL;
- const char *remainder = NULL;
- if (input[1] == '/' || input[1] == '\0')
- {
- home = fn_getenv ("HOME");
- remainder = input + 1;
- }
- else
- {
- struct string user_name = DS_EMPTY_INITIALIZER;
- struct passwd *pwd;
-
- ds_assign_substring (&user_name,
- ss_buffer (input + 1,
- strcspn (input + 1, "/")));
- pwd = getpwnam (ds_cstr (&user_name));
- if (pwd != NULL && pwd->pw_dir[0] != '\0')
- {
- home = xstrdup (pwd->pw_dir);
- remainder = input + 1 + ds_length (&user_name);
- }
- ds_destroy (&user_name);
- }
-
- if (home != NULL)
- {
- ds_put_cstr (&output, home);
- if (*remainder != '\0')
- ds_put_cstr (&output, remainder);
- }
- }
- if (ds_is_empty (&output))
- ds_put_cstr (&output, input);
- return ds_cstr (&output);
-}
-#else /* !unix */
-char *
-fn_tilde_expand (const char *input)
-{
- return xstrdup (input);
-}
-#endif /* !unix */
-
-/* Searches for a configuration file with name NAME in the path
- given by PATH, which is tilde- and environment-interpolated.
- Directories in PATH are delimited by ':'. Returns the
- malloc'd full name of the first file found, or NULL if none is
- found. */
-char *
-fn_search_path (const char *base_name, const char *path_)
-{
- struct string path;
- struct substring dir_;
- struct string file = DS_EMPTY_INITIALIZER;
- size_t save_idx = 0;
-
- if (fn_is_absolute (base_name))
- return fn_tilde_expand (base_name);
-
- /* Interpolate environment variables. */
- ds_init_cstr (&path, path_);
- fn_interp_vars (ds_ss (&path), fn_getenv, &path);
-
- verbose_msg (2, _("searching for \"%s\" in path \"%s\""),
- base_name, ds_cstr (&path));
- while (ds_separate (&path, ss_cstr (":"), &save_idx, &dir_))
- {
- struct string dir;
-
- /* Do tilde expansion. */
- ds_init_substring (&dir, dir_);
- if (ds_first (&dir) == '~')
- {
- char *tmp_str = fn_tilde_expand (ds_cstr (&dir));
- ds_assign_cstr (&dir, tmp_str);
- free (tmp_str);
- }
-
- /* Construct file name. */
- ds_clear (&file);
- ds_put_cstr (&file, ds_cstr (&dir));
- if (!ds_is_empty (&file) && ds_last (&file) != '/')
- ds_put_char (&file, '/');
- ds_put_cstr (&file, base_name);
- ds_destroy (&dir);
-
- /* Check whether file exists. */
- if (fn_exists (ds_cstr (&file)))
- {
- verbose_msg (2, _("...found \"%s\""), ds_cstr (&file));
- ds_destroy (&path);
- return ds_cstr (&file);
- }
- }
-
- /* Failure. */
- verbose_msg (2, _("...not found"));
- ds_destroy (&path);
- ds_destroy (&file);
- return NULL;
-}
-
-/* fn_normalize(): This very OS-dependent routine canonicalizes
- file name FN1. The file name should not need to be the name of an
- existing file. Returns a malloc()'d copy of the canonical name.
- This function must always succeed; if it needs to bail out then it
- should return xstrdup(FN1). */
-#ifdef unix
-char *
-fn_normalize (const char *file_name)
-{
- const char *src;
- char *fn1, *fn2, *dest;
- int maxlen;
-
- if (fn_is_special (file_name))
- return xstrdup (file_name);
-
- fn1 = fn_tilde_expand (file_name);
-
- /* Follow symbolic links. */
- for (;;)
- {
- fn2 = fn1;
- fn1 = fn_readlink (fn1);
- if (!fn1)
- {
- fn1 = fn2;
- break;
- }
- free (fn2);
- }
-
- maxlen = strlen (fn1) * 2;
- if (maxlen < 31)
- maxlen = 31;
- dest = fn2 = xmalloc (maxlen + 1);
- src = fn1;
-
- if (*src == '/')
- *dest++ = *src++;
- else
- {
- errno = 0;
- while (getcwd (dest, maxlen - (dest - fn2)) == NULL && errno == ERANGE)
- {
- maxlen *= 2;
- dest = fn2 = xrealloc (fn2, maxlen + 1);
- errno = 0;
- }
- if (errno)
- {
- free (fn1);
- free (fn2);
- return NULL;
- }
- dest = strchr (fn2, '\0');
- if (dest - fn2 >= maxlen)
- {
- int ofs = dest - fn2;
- maxlen *= 2;
- fn2 = xrealloc (fn2, maxlen + 1);
- dest = fn2 + ofs;
- }
- if (dest[-1] != '/')
- *dest++ = '/';
- }
-
- for (;;)
- {
- int c, f;
-
- c = *src++;
-
- f = 0;
- if (c == '/' || c == 0)
- {
- /* remove `./', `../' from directory */
- if (dest[-1] == '.' && dest[-2] == '/')
- dest--;
- else if (dest[-1] == '.' && dest[-2] == '.' && dest[-3] == '/')
- {
- dest -= 3;
- if (dest == fn2)
- dest++;
- while (dest[-1] != '/')
- dest--;
- }
- else if (dest[-1] != '/') /* remove extra slashes */
- f = 1;
-
- if (c == 0)
- {
- if (dest[-1] == '/' && dest > fn2 + 1)
- dest--;
- *dest = 0;
- free (fn1);
-
- return xrealloc (fn2, strlen (fn2) + 1);
- }
- }
- else
- f = 1;
-
- if (f)
- {
- if (dest - fn2 >= maxlen)
- {
- int ofs = dest - fn2;
- maxlen *= 2;
- fn2 = xrealloc (fn2, maxlen + 1);
- dest = fn2 + ofs;
- }
- *dest++ = c;
- }
- }
-}
-#elif defined (__WIN32__)
-char *
-fn_normalize (const char *fn1)
-{
- DWORD len;
- DWORD success;
- char *fn2;
-
- /* Don't change special file names. */
- if (is_special_file_name (file_name))
- return xstrdup (file_name);
-
- /* First find the required buffer length. */
- len = GetFullPathName (fn1, 0, NULL, NULL);
- if (!len)
- {
- fn2 = xstrdup (fn1);
- return fn2;
- }
-
- /* Then make a buffer that big. */
- fn2 = xmalloc (len);
- success = GetFullPathName (fn1, len, fn2, NULL);
- if (success >= len || success == 0)
- {
- free (fn2);
- fn2 = xstrdup (fn1);
- return fn2;
- }
- return fn2;
-}
-#elif __BORLANDC__
-char *
-fn_normalize (const char *fn1)
-{
- char *fn2 = _fullpath (NULL, fn1, 0);
- if (fn2)
- {
- char *cp;
- for (cp = fn2; *cp; cp++)
- *cp = toupper ((unsigned char) (*cp));
- return fn2;
- }
- return xstrdup (fn1);
-}
-#elif __DJGPP__
-char *
-fn_normalize (const char *fn1)
-{
- char *fn2 = xmalloc (1024);
- _fixpath (fn1, fn2);
- fn2 = xrealloc (fn2, strlen (fn2) + 1);
- return fn2;
-}
-#else /* not Lose32, Unix, or DJGPP */
-char *
-fn_normalize (const char *fn)
-{
- return xstrdup (fn);
-}
-#endif /* not Lose32, Unix, or DJGPP */
-
-/* Returns the directory part of FILE_NAME, as a malloc()'d
- string. */
-char *
-fn_dir_name (const char *file_name)
-{
- const char *p;
- char *s;
- size_t len;
-
- len = strlen (file_name);
- if (len == 1 && file_name[0] == '/')
- p = file_name + 1;
- else if (len && file_name[len - 1] == '/')
- p = buf_find_reverse (file_name, len - 1, file_name + len - 1, 1);
- else
- p = strrchr (file_name, '/');
- if (p == NULL)
- p = file_name;
-
- s = xmalloc (p - file_name + 1);
- memcpy (s, file_name, p - file_name);
- s[p - file_name] = 0;
-
- return s;
-}
-