From 43573013c9836f2b91b74b9b29dac35fdb41e06b Mon Sep 17 00:00:00 2001 From: Sergio Durigan Junior Date: Mon, 11 Sep 2017 00:54:33 -0400 Subject: [PATCH] Get rid of "gdb_dirbuf" and use "getcwd (NULL, 0)" Currently we have "current_directory" and "gdb_dirbuf" globals, which means that we basically have two possible places to consult when we want to know GDB's current working directory. This is not ideal and can lead to confusion. Moreover, the way we're using "gdb_difbuf" along with "getcwd" is problematic because we declare the buffer with "1024" elements hardcoded, which does not take into account longer pathnames that are possible in many filesystems. Using "PATH_MAX" would also not be a solution because of portability problems. Therefore, the best solution is to rely on the fact that "getcwd (NULL, 0)" will "do the right thing" and return a heap-allocated string containing the full path. With the new "getcwd" module from gnulib, it is now possible to do that without worrying about breaking some host. With this patch "current_directory" is now the only place to check for GDB's cwd. Reviewed-by: Pedro Alves gdb/ChangeLog: 2017-09-22 Sergio Durigan Junior * cli/cli-cmds.c (pwd_command): Use "getcwd (NULL, 0)". (cd_command): Likewise. Free "current_directory" before assigning to it. * main.c (captured_main_1): Use "getcwd (NULL, 0)". * mi/mi-cmd-env.c (mi_cmd_env_pwd): Likewise. * top.c (gdb_dirbuf): Remove global declaration. * top.h (gdb_dirbuf): Likewise. --- gdb/ChangeLog | 10 ++++++++++ gdb/cli/cli-cmds.c | 17 ++++++++++++----- gdb/main.c | 5 ++--- gdb/mi/mi-cmd-env.c | 7 ++++--- gdb/top.c | 3 --- gdb/top.h | 1 - 6 files changed, 28 insertions(+), 15 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 1bbf2b8d139..54eadaef98f 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,13 @@ +2017-09-22 Sergio Durigan Junior + + * cli/cli-cmds.c (pwd_command): Use "getcwd (NULL, 0)". + (cd_command): Likewise. Free "current_directory" before + assigning to it. + * main.c (captured_main_1): Use "getcwd (NULL, 0)". + * mi/mi-cmd-env.c (mi_cmd_env_pwd): Likewise. + * top.c (gdb_dirbuf): Remove global declaration. + * top.h (gdb_dirbuf): Likewise. + 2017-09-22 Sergio Durigan Junior * gnulib/aclocal.m4: Regenerate. diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c index 260fd3f6353..cbafb13837f 100644 --- a/gdb/cli/cli-cmds.c +++ b/gdb/cli/cli-cmds.c @@ -384,13 +384,16 @@ pwd_command (char *args, int from_tty) { if (args) error (_("The \"pwd\" command does not take an argument: %s"), args); - if (! getcwd (gdb_dirbuf, sizeof (gdb_dirbuf))) + + gdb::unique_xmalloc_ptr cwd (getcwd (NULL, 0)); + + if (cwd == NULL) error (_("Error finding name of working directory: %s"), safe_strerror (errno)); - if (strcmp (gdb_dirbuf, current_directory) != 0) + if (strcmp (cwd.get (), current_directory) != 0) printf_unfiltered (_("Working directory %s\n (canonically %s).\n"), - current_directory, gdb_dirbuf); + current_directory, cwd.get ()); else printf_unfiltered (_("Working directory %s.\n"), current_directory); } @@ -418,7 +421,8 @@ cd_command (char *dir, int from_tty) /* There's too much mess with DOSish names like "d:", "d:.", "d:./foo" etc. Instead of having lots of special #ifdef'ed code, simply get the canonicalized name of the current directory. */ - dir = getcwd (gdb_dirbuf, sizeof (gdb_dirbuf)); + gdb::unique_xmalloc_ptr cwd (getcwd (NULL, 0)); + dir = cwd.get (); #endif len = strlen (dir); @@ -436,7 +440,10 @@ cd_command (char *dir, int from_tty) dir_holder.reset (savestring (dir, len)); if (IS_ABSOLUTE_PATH (dir_holder.get ())) - current_directory = dir_holder.release (); + { + xfree (current_directory); + current_directory = dir_holder.release (); + } else { if (IS_DIR_SEPARATOR (current_directory[strlen (current_directory) - 1])) diff --git a/gdb/main.c b/gdb/main.c index fe80511243b..66ba75ba210 100644 --- a/gdb/main.c +++ b/gdb/main.c @@ -549,11 +549,10 @@ captured_main_1 (struct captured_main_args *context) (xstrprintf ("%s: warning: ", gdb_program_name)); warning_pre_print = tmp_warn_preprint.get (); - if (! getcwd (gdb_dirbuf, sizeof (gdb_dirbuf))) + current_directory = getcwd (NULL, 0); + if (current_directory == NULL) perror_warning_with_name (_("error finding working directory")); - current_directory = gdb_dirbuf; - /* Set the sysroot path. */ gdb_sysroot = relocate_gdb_directory (TARGET_SYSTEM_ROOT, TARGET_SYSTEM_ROOT_RELOCATABLE); diff --git a/gdb/mi/mi-cmd-env.c b/gdb/mi/mi-cmd-env.c index 977b6e274da..0d08bb89a93 100644 --- a/gdb/mi/mi-cmd-env.c +++ b/gdb/mi/mi-cmd-env.c @@ -74,11 +74,12 @@ mi_cmd_env_pwd (const char *command, char **argv, int argc) /* Otherwise the mi level is 2 or higher. */ - if (! getcwd (gdb_dirbuf, sizeof (gdb_dirbuf))) + gdb::unique_xmalloc_ptr cwd (getcwd (NULL, 0)); + if (cwd == NULL) error (_("-environment-pwd: error finding name of working directory: %s"), safe_strerror (errno)); - - uiout->field_string ("cwd", gdb_dirbuf); + + uiout->field_string ("cwd", cwd.get ()); } /* Change working directory. */ diff --git a/gdb/top.c b/gdb/top.c index 404e096755c..c89e78f2439 100644 --- a/gdb/top.c +++ b/gdb/top.c @@ -133,9 +133,6 @@ show_confirm (struct ui_file *file, int from_tty, char *current_directory; -/* The directory name is actually stored here (usually). */ -char gdb_dirbuf[1024]; - /* The last command line executed on the console. Used for command repetitions. */ char *saved_command_line; diff --git a/gdb/top.h b/gdb/top.h index 45798897f69..6b660839959 100644 --- a/gdb/top.h +++ b/gdb/top.h @@ -219,7 +219,6 @@ extern void ui_unregister_input_event_handler (struct ui *ui); /* From top.c. */ extern char *saved_command_line; extern int confirm; -extern char gdb_dirbuf[1024]; extern int inhibit_gdbinit; extern const char gdbinit[]; -- 2.30.2