[PATCH 1/1] perf report/top TUI: Fix title line formatting

[PATCH 1/1] perf report/top TUI: Fix title line formatting

[Arnaldo Carvalho de Melo]

Acks? :)

--- 

In d10ec006dcd7 ("perf hists browser: Allow passing an initial hotkey")
the hist_entry__title() call was cut'n'pasted to a function where the
'title' variable is a pointer, not an array, so the sizeof(title)
continues syntactically valid but ends up reducing the real size of the
buffer where to format the first line in the screen to 8 bytes, which
makes the formatting at the title at each refresh to produce just the
string "Samples ", duh, fix it by passing the size of the buffer.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Fixes: d10ec006dcd7 ("perf hists browser: Allow passing an initial hotkey")
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/ui/browsers/hists.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 95ac5e2ea949..487e54ef56a9 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -677,7 +677,7 @@ static int hist_browser__title(struct hist_browser *browser, char *bf, size_t si
 	return browser->title ? browser->title(browser, bf, size) : 0;
 }
 
-static int hist_browser__handle_hotkey(struct hist_browser *browser, bool warn_lost_event, char *title, int key)
+static int hist_browser__handle_hotkey(struct hist_browser *browser, bool warn_lost_event, char *title, size_t size, int key)
 {
 	switch (key) {
 	case K_TIMER: {
@@ -703,7 +703,7 @@ static int hist_browser__handle_hotkey(struct hist_browser *browser, bool warn_l
 			ui_browser__warn_lost_events(&browser->b);
 		}
 
-		hist_browser__title(browser, title, sizeof(title));
+		hist_browser__title(browser, title, size);
 		ui_browser__show_title(&browser->b, title);
 		break;
 	}
@@ -764,13 +764,13 @@ int hist_browser__run(struct hist_browser *browser, const char *help,
 	if (ui_browser__show(&browser->b, title, "%s", help) < 0)
 		return -1;
 
-	if (key && hist_browser__handle_hotkey(browser, warn_lost_event, title, key))
+	if (key && hist_browser__handle_hotkey(browser, warn_lost_event, title, sizeof(title), key))
 		goto out;
 
 	while (1) {
 		key = ui_browser__run(&browser->b, delay_secs);
 
-		if (hist_browser__handle_hotkey(browser, warn_lost_event, title, key))
+		if (hist_browser__handle_hotkey(browser, warn_lost_event, title, sizeof(title), key))
 			break;
 	}
 out:
-- 
2.25.1

[tip: perf/urgent] perf report/top TUI: Fix title line formatting

[tip-bot2 for Arnaldo Carvalho de Melo]

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     376c3c22e2ba69d7509aa070f1a7dd88efdb0a9c
Gitweb:        https://git.kernel.org/tip/376c3c22e2ba69d7509aa070f1a7dd88efdb0a9c
Author:        Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate:    Mon, 30 Mar 2020 12:35:21 -03:00
Committer:     Arnaldo Carvalho de Melo <acme@redhat.com>
CommitterDate: Fri, 03 Apr 2020 09:37:55 -03:00

perf report/top TUI: Fix title line formatting

In d10ec006dcd7 ("perf hists browser: Allow passing an initial hotkey")
the hist_entry__title() call was cut'n'pasted to a function where the
'title' variable is a pointer, not an array, so the sizeof(title)
continues syntactically valid but ends up reducing the real size of the
buffer where to format the first line in the screen to 8 bytes, which
makes the formatting at the title at each refresh to produce just the
string "Samples ", duh, fix it by passing the size of the buffer.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Fixes: d10ec006dcd7 ("perf hists browser: Allow passing an initial hotkey")
Link: http://lore.kernel.org/lkml/20200330154314.GB4576@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/ui/browsers/hists.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 95ac5e2..487e54e 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -677,7 +677,7 @@ static int hist_browser__title(struct hist_browser *browser, char *bf, size_t si
 	return browser->title ? browser->title(browser, bf, size) : 0;
 }
 
-static int hist_browser__handle_hotkey(struct hist_browser *browser, bool warn_lost_event, char *title, int key)
+static int hist_browser__handle_hotkey(struct hist_browser *browser, bool warn_lost_event, char *title, size_t size, int key)
 {
 	switch (key) {
 	case K_TIMER: {
@@ -703,7 +703,7 @@ static int hist_browser__handle_hotkey(struct hist_browser *browser, bool warn_l
 			ui_browser__warn_lost_events(&browser->b);
 		}
 
-		hist_browser__title(browser, title, sizeof(title));
+		hist_browser__title(browser, title, size);
 		ui_browser__show_title(&browser->b, title);
 		break;
 	}
@@ -764,13 +764,13 @@ int hist_browser__run(struct hist_browser *browser, const char *help,
 	if (ui_browser__show(&browser->b, title, "%s", help) < 0)
 		return -1;
 
-	if (key && hist_browser__handle_hotkey(browser, warn_lost_event, title, key))
+	if (key && hist_browser__handle_hotkey(browser, warn_lost_event, title, sizeof(title), key))
 		goto out;
 
 	while (1) {
 		key = ui_browser__run(&browser->b, delay_secs);
 
-		if (hist_browser__handle_hotkey(browser, warn_lost_event, title, key))
+		if (hist_browser__handle_hotkey(browser, warn_lost_event, title, sizeof(title), key))
 			break;
 	}
 out: