[RFC PATCH v5 1/9] Convert substitute_path_component to C++

Philipp Rudo
2018-03-12T15:31:31Z

Simplify the code of utils.c:substiute_path_component by converting it to C++.

gdb/ChangeLog:

* utils.c (substitute_path_component): Convert to C++.
* utils.h (substitute_path_componetn): Adjust declatation.
* auto-load.c (auto_load_expand_dir_vars): Adjust.
---
gdb/auto-load.c | 19 ++++++++-----------
gdb/utils.c | 47 +++++++++++------------------------------------
gdb/utils.h | 10 ++++++++--
3 files changed, 27 insertions(+), 49 deletions(-)

diff --git a/gdb/auto-load.c b/gdb/auto-load.c
index 70bddbc862..a7f9635252 100644
--- a/gdb/auto-load.c
+++ b/gdb/auto-load.c
@@ -175,21 +175,18 @@ std::vector<gdb::unique_xmalloc_ptr<char>> auto_load_safe_path_vec;
substitute_path_component. */

static std::vector<gdb::unique_xmalloc_ptr<char>>
-auto_load_expand_dir_vars (const char *string)
+auto_load_expand_dir_vars (const std::string &string)
{
- char *s = xstrdup (string);
- substitute_path_component (&s, "$datadir", gdb_datadir);
- substitute_path_component (&s, "$debugdir", debug_file_directory);
+ std::string s (string);
+ substitute_path_component (s, "$datadir", gdb_datadir);
+ substitute_path_component (s, "$debugdir", debug_file_directory);

- if (debug_auto_load && strcmp (s, string) != 0)
+ if (debug_auto_load && s.compare (string) != 0)
fprintf_unfiltered (gdb_stdlog,
- _("auto-load: Expanded $-variables to \"%s\".\n"), s);
+ _("auto-load: Expanded $-variables to \"%s\".\n"),
+ s.c_str ());

- std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec
- = dirnames_to_char_ptr_vec (s);
- xfree(s);
-
- return dir_vec;
+ return dirnames_to_char_ptr_vec (s.c_str ());
}

/* Update auto_load_safe_path_vec from current AUTO_LOAD_SAFE_PATH. */
diff --git a/gdb/utils.c b/gdb/utils.c
index b99d444a6e..d4f1398d14 100644
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -3052,49 +3052,24 @@ make_bpstat_clear_actions_cleanup (void)
return make_cleanup (do_bpstat_clear_actions_cleanup, NULL);
}

-/* Substitute all occurences of string FROM by string TO in *STRINGP. *STRINGP
- must come from xrealloc-compatible allocator and it may be updated. FROM
- needs to be delimited by IS_DIR_SEPARATOR or DIRNAME_SEPARATOR (or be
- located at the start or end of *STRINGP. */
+/* See utils.h. */

void
-substitute_path_component (char **stringp, const char *from, const char *to)
+substitute_path_component (std::string &str, const std::string &from,
+ const std::string &to)
{
- char *string = *stringp, *s;
- const size_t from_len = strlen (from);
- const size_t to_len = strlen (to);
-
- for (s = string;;)
+ for (size_t pos = str.find (from); pos != std::string::npos;
+ pos = str.find (from, pos + to.length ()))
{
- s = strstr (s, from);
- if (s == NULL)
- break;
-
- if ((s == string || IS_DIR_SEPARATOR (s[-1])
- || s[-1] == DIRNAME_SEPARATOR)
- && (s[from_len] == '\0' || IS_DIR_SEPARATOR (s[from_len])
- || s[from_len] == DIRNAME_SEPARATOR))
+ char start = pos == 0 ? str[0] : str[pos - 1];
+ char end = str[pos + from.length ()];
+ if ((pos == 0 || IS_DIR_SEPARATOR (start) || start == DIRNAME_SEPARATOR)
+ && (end == '\0' || IS_DIR_SEPARATOR (end)
+ || end == DIRNAME_SEPARATOR))
{
- char *string_new;
-
- string_new
- = (char *) xrealloc (string, (strlen (string) + to_len + 1));
-
- /* Relocate the current S pointer. */
- s = s - string + string_new;
- string = string_new;
-
- /* Replace from by to. */
- memmove (&s[to_len], &s[from_len], strlen (&s[from_len]) + 1);
- memcpy (s, to, to_len);
-
- s += to_len;
+ str.replace (pos, from.length (), to);
}
- else
- s++;
}
-
- *stringp = string;
}

#ifdef HAVE_WAITPID
diff --git a/gdb/utils.h b/gdb/utils.h
index 8ca3eb0369..7e6a39ee82 100644
--- a/gdb/utils.h
+++ b/gdb/utils.h
@@ -298,8 +298,14 @@ extern struct cleanup *make_bpstat_clear_actions_cleanup (void);
extern int gdb_filename_fnmatch (const char *pattern, const char *string,
int flags);

-extern void substitute_path_component (char **stringp, const char *from,
- const char *to);
+/* Substitute all occurences of string FROM by string TO in STR. STR
+ must come from xrealloc-compatible allocator and it may be updated. FROM
+ needs to be delimited by IS_DIR_SEPARATOR or DIRNAME_SEPARATOR (or be
+ located at the start or end of STR). */
+
+extern void substitute_path_component (std::string &str,
+ const std::string &from,
+ const std::string &to);

std::string ldirname (const char *filename);

--
2.13.5