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Convert a lot of 'int' variables to 'bool'.

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My normal habit these days, in new code, is to treat int and bool as
_almost_ completely separate types. I'm still willing to use C's
implicit test for zero on an integer (e.g. 'if (!blob.len)' is fine,
no need to spell it out as blob.len != 0), but generally, if a
variable is going to be conceptually a boolean, I like to declare it
bool and assign to it using 'true' or 'false' rather than 0 or 1.

PuTTY is an exception, because it predates the C99 bool, and I've
stuck to its existing coding style even when adding new code to it.
But it's been annoying me more and more, so now that I've decided C99
bool is an acceptable thing to require from our toolchain in the first
place, here's a quite thorough trawl through the source doing
'boolification'. Many variables and function parameters are now typed
as bool rather than int; many assignments of 0 or 1 to those variables
are now spelled 'true' or 'false'.

I managed this thorough conversion with the help of a custom clang
plugin that I wrote to trawl the AST and apply heuristics to point out
where things might want changing. So I've even managed to do a decent
job on parts of the code I haven't looked at in years!

To make the plugin's work easier, I pushed platform front ends
generally in the direction of using standard 'bool' in preference to
platform-specific boolean types like Windows BOOL or GTK's gboolean;
I've left the platform booleans in places they _have_ to be for the
platform APIs to work right, but variables only used by my own code
have been converted wherever I found them.

In a few places there are int values that look very like booleans in
_most_ of the places they're used, but have a rarely-used third value,
or a distinction between different nonzero values that most users
don't care about. In these cases, I've _removed_ uses of 'true' and
'false' for the return values, to emphasise that there's something
more subtle going on than a simple boolean answer:
 - the 'multisel' field in dialog.h's list box structure, for which
   the GTK front end in particular recognises a difference between 1
   and 2 but nearly everything else treats as boolean
 - the 'urgent' parameter to plug_receive, where 1 vs 2 tells you
   something about the specific location of the urgent pointer, but
   most clients only care about 0 vs 'something nonzero'
 - the return value of wc_match, where -1 indicates a syntax error in
   the wildcard.
 - the return values from SSH-1 RSA-key loading functions, which use
   -1 for 'wrong passphrase' and 0 for all other failures (so any
   caller which already knows it's not loading an _encrypted private_
   key can treat them as boolean)
 - term->esc_query, and the 'query' parameter in toggle_mode in
   terminal.c, which _usually_ hold 0 for ESC[123h or 1 for ESC[?123h,
   but can also hold -1 for some other intervening character that we
   don't support.

In a few places there's an integer that I haven't turned into a bool
even though it really _can_ only take values 0 or 1 (and, as above,
tried to make the call sites consistent in not calling those values
true and false), on the grounds that I thought it would make it more
confusing to imply that the 0 value was in some sense 'negative' or
bad and the 1 positive or good:
 - the return value of plug_accepting uses the POSIXish convention of
   0=success and nonzero=error; I think if I made it bool then I'd
   also want to reverse its sense, and that's a job for a separate
   piece of work.
 - the 'screen' parameter to lineptr() in terminal.c, where 0 and 1
   represent the default and alternate screens. There's no obvious
   reason why one of those should be considered 'true' or 'positive'
   or 'success' - they're just indices - so I've left it as int.

ssh_scp_recv had particularly confusing semantics for its previous int
return value: its call sites used '<= 0' to check for error, but it
never actually returned a negative number, just 0 or 1. Now the
function and its call sites agree that it's a bool.

In a couple of places I've renamed variables called 'ret', because I
don't like that name any more - it's unclear whether it means the
return value (in preparation) for the _containing_ function or the
return value received from a subroutine call, and occasionally I've
accidentally used the same variable for both and introduced a bug. So
where one of those got in my way, I've renamed it to 'toret' or 'retd'
(the latter short for 'returned') in line with my usual modern
practice, but I haven't done a thorough job of finding all of them.

Finally, one amusing side effect of doing this is that I've had to
separate quite a few chained assignments. It used to be perfectly fine
to write 'a = b = c = TRUE' when a,b,c were int and TRUE was just a
the 'true' defined by stdbool.h, that idiom provokes a warning from
gcc: 'suggest parentheses around assignment used as truth value'!
This commit is contained in:
Simon Tatham
2018-11-02 19:23:19 +00:00
parent 1378bb049a
commit 3214563d8e
164 changed files with 2914 additions and 2805 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
unix/gtkmain.c
View File

@ -48,7 +48,7 @@ static char *progname, **gtkargvstart;
static int ngtkargs;
extern char **pty_argv; /* declared in pty.c */
extern int use_pty_argv;
extern bool use_pty_argv;
static const char *app_name = "pterm";
@ -312,9 +312,9 @@ void window_setup_error(const char *errmsg)
exit(1);
}
int do_cmdline(int argc, char **argv, int do_everything, Conf *conf)
bool do_cmdline(int argc, char **argv, bool do_everything, Conf *conf)
{
int err = 0;
bool err = false;
char *val;
/*
@ -327,7 +327,7 @@ int do_cmdline(int argc, char **argv, int do_everything, Conf *conf)
*/
#define EXPECTS_ARG { \
if (--argc <= 0) { \
err = 1; \
err = true; \
fprintf(stderr, "%s: %s expects an argument\n", appname, p); \
continue; \
} else \
@ -417,14 +417,14 @@ int do_cmdline(int argc, char **argv, int do_everything, Conf *conf)
{
#if GTK_CHECK_VERSION(3,0,0)
GdkRGBA rgba;
int success = gdk_rgba_parse(&rgba, val);
bool success = gdk_rgba_parse(&rgba, val);
#else
GdkColor col;
int success = gdk_color_parse(val, &col);
bool success = gdk_color_parse(val, &col);
#endif
if (!success) {
err = 1;
err = true;
fprintf(stderr, "%s: unable to parse colour \"%s\"\n",
appname, val);
} else {
@ -467,7 +467,7 @@ int do_cmdline(int argc, char **argv, int do_everything, Conf *conf)
pty_argv[argc] = NULL;
break; /* finished command-line processing */
} else
err = 1, fprintf(stderr, "%s: -e expects an argument\n",
err = true, fprintf(stderr, "%s: -e expects an argument\n",
appname);
} else if (!strcmp(p, "-title")) {
@ -535,13 +535,13 @@ int do_cmdline(int argc, char **argv, int do_everything, Conf *conf)
} else if (p[0] != '-') {
/* Non-option arguments not handled by cmdline.c are errors. */
if (do_everything) {
err = 1;
err = true;
fprintf(stderr, "%s: unexpected non-option argument '%s'\n",
appname, p);
}
} else {
err = 1;
err = true;
fprintf(stderr, "%s: unrecognized option '%s'\n", appname, p);
}
}
@ -554,7 +554,7 @@ GtkWidget *make_gtk_toplevel_window(GtkFrontend *frontend)
return gtk_window_new(GTK_WINDOW_TOPLEVEL);
}
const int buildinfo_gtk_relevant = true;
const bool buildinfo_gtk_relevant = true;
struct post_initial_config_box_ctx {
Conf *conf;
@ -586,14 +586,14 @@ void session_window_closed(void)
int main(int argc, char **argv)
{
Conf *conf;
int need_config_box;
bool need_config_box;
setlocale(LC_CTYPE, "");
{
/* Call the function in ux{putty,pterm}.c to do app-type
* specific setup */
extern void setup(int);
extern void setup(bool);
setup(true); /* true means we are a one-session process */
}
@ -623,10 +623,10 @@ int main(int argc, char **argv)
* terminating the main pterm/PuTTY. However, we'll have to
* unblock it again when pterm forks.
*/
block_signal(SIGPIPE, 1);
block_signal(SIGPIPE, true);
if (argc > 1 && !strncmp(argv[1], "---", 3)) {
extern const int dup_check_launchable;
extern const bool dup_check_launchable;
read_dupsession_data(conf, argv[1]);
/* Splatter this argument so it doesn't clutter a ps listing */
@ -635,10 +635,10 @@ int main(int argc, char **argv)
assert(!dup_check_launchable || conf_launchable(conf));
need_config_box = false;
} else {
if (do_cmdline(argc, argv, 0, conf))
if (do_cmdline(argc, argv, false, conf))
exit(1); /* pre-defaults pass to get -class */
do_defaults(NULL, conf);
if (do_cmdline(argc, argv, 1, conf))
if (do_cmdline(argc, argv, true, conf))
exit(1); /* post-defaults, do everything */
cmdline_run_saved(conf);