perf ui: Introduce ui_browser->seek to support multiple list structures

So that we can use the ui_browser on things like an rb_tree, etc.

Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 43 insertions, 26 deletions

diff --git a/tools/perf/util/newt.c b/tools/perf/util/newt.c
index 1e774e7f2281..0ffc8281363c 100644
--- a/tools/perf/util/newt.c
+++ b/tools/perf/util/newt.c
@@ -267,9 +267,42 @@ struct ui_browser {
         void            *first_visible_entry, *entries;
         u16             top, left, width, height;
         void            *priv;
+        void            (*seek)(struct ui_browser *self,
+                                off_t offset, int whence);
         u32             nr_entries;
 };
 
+static void ui_browser__list_head_seek(struct ui_browser *self,
+                                       off_t offset, int whence)
+{
+        struct list_head *head = self->entries;
+        struct list_head *pos;
+
+        switch (whence) {
+        case SEEK_SET:
+                pos = head->next;
+                break;
+        case SEEK_CUR:
+                pos = self->first_visible_entry;
+                break;
+        case SEEK_END:
+                pos = head->prev;
+                break;
+        default:
+                return;
+        }
+
+        if (offset > 0) {
+                while (offset-- != 0)
+                        pos = pos->next;
+        } else {
+                while (offset++ != 0)
+                        pos = pos->prev;
+        }
+
+        self->first_visible_entry = pos;
+}
+
 static bool ui_browser__is_current_entry(struct ui_browser *self, unsigned row)
 {
         return (self->first_visible_entry_idx + row) == self->index;
@@ -292,7 +325,7 @@ static void ui_browser__refresh_dimensions(struct ui_browser *self)
 static void ui_browser__reset_index(struct ui_browser *self)
 {
         self->index = self->first_visible_entry_idx = 0;
-        self->first_visible_entry = NULL;
+        self->seek(self, 0, SEEK_SET);
 }
 
 static int objdump_line__show(struct objdump_line *self, struct list_head *head,
@@ -408,7 +441,7 @@ static int ui_browser__run(struct ui_browser *self, const char *title,
         newtFormAddComponent(self->form, self->sb);
 
         while (1) {
-                unsigned int offset;
+                off_t offset;
 
                 newtFormRun(self->form, es);
 
@@ -422,9 +455,8 @@ static int ui_browser__run(struct ui_browser *self, const char *title,
                                 break;
                         ++self->index;
                         if (self->index == self->first_visible_entry_idx + self->height) {
-                                struct list_head *pos = self->first_visible_entry;
                                 ++self->first_visible_entry_idx;
-                                self->first_visible_entry = pos->next;
+                                self->seek(self, +1, SEEK_CUR);
                         }
                         break;
                 case NEWT_KEY_UP:
@@ -432,9 +464,8 @@ static int ui_browser__run(struct ui_browser *self, const char *title,
                                 break;
                         --self->index;
                         if (self->index < self->first_visible_entry_idx) {
-                                struct list_head *pos = self->first_visible_entry;
                                 --self->first_visible_entry_idx;
-                                self->first_visible_entry = pos->prev;
+                                self->seek(self, -1, SEEK_CUR);
                         }
                         break;
                 case NEWT_KEY_PGDN:
@@ -447,12 +478,7 @@ static int ui_browser__run(struct ui_browser *self, const char *title,
                                 offset = self->nr_entries - 1 - self->index;
                         self->index += offset;
                         self->first_visible_entry_idx += offset;
-
-                        while (offset--) {
-                                struct list_head *pos = self->first_visible_entry;
-                                self->first_visible_entry = pos->next;
-                        }
-
+                        self->seek(self, +offset, SEEK_CUR);
                         break;
                 case NEWT_KEY_PGUP:
                         if (self->first_visible_entry_idx == 0)
@@ -465,29 +491,19 @@ static int ui_browser__run(struct ui_browser *self, const char *title,
 
                         self->index -= offset;
                         self->first_visible_entry_idx -= offset;
-
-                        while (offset--) {
-                                struct list_head *pos = self->first_visible_entry;
-                                self->first_visible_entry = pos->prev;
-                        }
+                        self->seek(self, -offset, SEEK_CUR);
                         break;
                 case NEWT_KEY_HOME:
                         ui_browser__reset_index(self);
                         break;
-                case NEWT_KEY_END: {
-                        struct list_head *head = self->entries;
+                case NEWT_KEY_END:
                         offset = self->height - 1;
 
                         if (offset > self->nr_entries)
                                 offset = self->nr_entries;
 
                         self->index = self->first_visible_entry_idx = self->nr_entries - 1 - offset;
-                        self->first_visible_entry = head->prev;
-                        while (offset-- != 0) {
-                                struct list_head *pos = self->first_visible_entry;
-                                self->first_visible_entry = pos->prev;
-                        }
-                }
+                        self->seek(self, -offset, SEEK_END);
                         break;
                 case NEWT_KEY_RIGHT:
                 case NEWT_KEY_LEFT:
@@ -706,7 +722,8 @@ int hist_entry__tui_annotate(struct hist_entry *self)
         ui_helpline__push("Press <- or ESC to exit");
 
         memset(&browser, 0, sizeof(browser));
-        browser.entries = &head;
+        browser.entries         = &head;
+        browser.seek            = ui_browser__list_head_seek;
         browser.priv = self;
         list_for_each_entry(pos, &head, node) {
                 size_t line_len = strlen(pos->line);