wear_ui.cpp - android_bootable_recovery - Gitiles

 /*
  * Copyright (C) 2014 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "wear_ui.h"

 #include <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>

 #include <string>
 #include <vector>

 #include <android-base/properties.h>
 #include <android-base/strings.h>
 #include <android-base/stringprintf.h>
 #include <minui/minui.h>

 #include "common.h"
 #include "device.h"

 // Return the current time as a double (including fractions of a second).
 static double now() {
   struct timeval tv;
   gettimeofday(&tv, NULL);
   return tv.tv_sec + tv.tv_usec / 1000000.0;
 }

 WearRecoveryUI::WearRecoveryUI()
     : kProgressBarBaseline(RECOVERY_UI_PROGRESS_BAR_BASELINE),
       kMenuUnusableRows(RECOVERY_UI_MENU_UNUSABLE_ROWS) {
   // TODO: kMenuUnusableRows should be computed based on the lines in draw_screen_locked().

   // TODO: The following three variables are likely not needed. The first two are detected
   // automatically in ScreenRecoveryUI::LoadAnimation(), based on the actual files seen on device.
   intro_frames = 22;
   loop_frames = 60;

   touch_screen_allowed_ = true;

   for (size_t i = 0; i < 5; i++) backgroundIcon[i] = NULL;
 }

 int WearRecoveryUI::GetProgressBaseline() const {
   return kProgressBarBaseline;
 }

 // Draw background frame on the screen.  Does not flip pages.
 // Should only be called with updateMutex locked.
 // TODO merge drawing routines with screen_ui
 void WearRecoveryUI::draw_background_locked() {
   pagesIdentical = false;
   gr_color(0, 0, 0, 255);
   gr_fill(0, 0, gr_fb_width(), gr_fb_height());

   if (currentIcon != NONE) {
     GRSurface* surface;
     if (currentIcon == INSTALLING_UPDATE || currentIcon == ERASING) {
       if (!intro_done) {
         surface = introFrames[current_frame];
       } else {
         surface = loopFrames[current_frame];
       }
     } else {
       surface = backgroundIcon[currentIcon];
     }

     int width = gr_get_width(surface);
     int height = gr_get_height(surface);

     int x = (gr_fb_width() - width) / 2;
     int y = (gr_fb_height() - height) / 2;

     gr_blit(surface, 0, 0, width, height, x, y);
   }
 }

 static const char* SWIPE_HELP[] = {
   "Swipe up/down to move.",
   "Swipe left/right to select.",
   "",
   NULL
 };

 // TODO merge drawing routines with screen_ui
 void WearRecoveryUI::draw_screen_locked() {
   char cur_selection_str[50];

   draw_background_locked();
   if (!show_text) {
     draw_foreground_locked();
   } else {
     SetColor(TEXT_FILL);
     gr_fill(0, 0, gr_fb_width(), gr_fb_height());

     int y = kMarginHeight;
     int x = kMarginWidth;
     if (show_menu) {
       std::string recovery_fingerprint =
           android::base::GetProperty("ro.bootimage.build.fingerprint", "");
       SetColor(HEADER);
       y += DrawTextLine(x + 4, y, "Android Recovery", true);
       for (auto& chunk : android::base::Split(recovery_fingerprint, ":")) {
         y += DrawTextLine(x + 4, y, chunk.c_str(), false);
       }

       // This is actually the help strings.
       y += DrawTextLines(x + 4, y, SWIPE_HELP);
       SetColor(HEADER);
       y += DrawTextLines(x + 4, y, menu_headers_);

       // Show the current menu item number in relation to total number if
       // items don't fit on the screen.
       if (menu_items > menu_end - menu_start) {
         sprintf(cur_selection_str, "Current item: %d/%d", menu_sel + 1, menu_items);
         gr_text(gr_sys_font(), x + 4, y, cur_selection_str, 1);
         y += char_height_ + 4;
       }

       // Menu begins here
       SetColor(MENU);

       for (int i = menu_start; i < menu_end; ++i) {
         if (i == menu_sel) {
           // draw the highlight bar
           SetColor(MENU_SEL_BG);
           gr_fill(x, y - 2, gr_fb_width() - x, y + char_height_ + 2);
           // white text of selected item
           SetColor(MENU_SEL_FG);
           if (menu_[i][0]) {
             gr_text(gr_sys_font(), x + 4, y, menu_[i], 1);
           }
           SetColor(MENU);
         } else if (menu_[i][0]) {
           gr_text(gr_sys_font(), x + 4, y, menu_[i], 0);
         }
         y += char_height_ + 4;
       }
       SetColor(MENU);
       y += 4;
       gr_fill(0, y, gr_fb_width(), y + 2);
       y += 4;
     }

     SetColor(LOG);

     // display from the bottom up, until we hit the top of the
     // screen, the bottom of the menu, or we've displayed the
     // entire text buffer.
     int ty;
     int row = (text_top_ + text_rows_ - 1) % text_rows_;
     size_t count = 0;
     for (int ty = gr_fb_height() - char_height_ - kMarginHeight; ty > y + 2 && count < text_rows_;
          ty -= char_height_, ++count) {
       gr_text(gr_sys_font(), x + 4, ty, text_[row], 0);
       --row;
       if (row < 0) row = text_rows_ - 1;
     }
   }
 }

 // TODO merge drawing routines with screen_ui
 void WearRecoveryUI::update_progress_locked() {
   draw_screen_locked();
   gr_flip();
 }

 bool WearRecoveryUI::InitTextParams() {
   if (!ScreenRecoveryUI::InitTextParams()) {
     return false;
   }

   text_cols_ = (gr_fb_width() - (kMarginWidth * 2)) / char_width_;

   if (text_rows_ > kMaxRows) text_rows_ = kMaxRows;
   if (text_cols_ > kMaxCols) text_cols_ = kMaxCols;

   visible_text_rows = (gr_fb_height() - (kMarginHeight * 2)) / char_height_;
   return true;
 }

 bool WearRecoveryUI::Init(const std::string& locale) {
   if (!ScreenRecoveryUI::Init(locale)) {
     return false;
   }

   LoadBitmap("icon_error", &backgroundIcon[ERROR]);
   backgroundIcon[NO_COMMAND] = backgroundIcon[ERROR];

   // This leaves backgroundIcon[INSTALLING_UPDATE] and backgroundIcon[ERASING]
   // as NULL which is fine since draw_background_locked() doesn't use them.

   return true;
 }

 void WearRecoveryUI::SetStage(int current, int max) {
 }

 void WearRecoveryUI::Print(const char* fmt, ...) {
   char buf[256];
   va_list ap;
   va_start(ap, fmt);
   vsnprintf(buf, 256, fmt, ap);
   va_end(ap);

   fputs(buf, stdout);

   // This can get called before ui_init(), so be careful.
   pthread_mutex_lock(&updateMutex);
   if (text_rows_ > 0 && text_cols_ > 0) {
     char* ptr;
     for (ptr = buf; *ptr != '\0'; ++ptr) {
       if (*ptr == '\n' || text_col_ >= text_cols_) {
         text_[text_row_][text_col_] = '\0';
         text_col_ = 0;
         text_row_ = (text_row_ + 1) % text_rows_;
         if (text_row_ == text_top_) text_top_ = (text_top_ + 1) % text_rows_;
       }
       if (*ptr != '\n') text_[text_row_][text_col_++] = *ptr;
     }
     text_[text_row_][text_col_] = '\0';
     update_screen_locked();
   }
   pthread_mutex_unlock(&updateMutex);
 }

 void WearRecoveryUI::StartMenu(const char* const* headers, const char* const* items,
                                int initial_selection) {
   pthread_mutex_lock(&updateMutex);
   if (text_rows_ > 0 && text_cols_ > 0) {
     menu_headers_ = headers;
     size_t i = 0;
     // "i < text_rows_" is removed from the loop termination condition,
     // which is different from the one in ScreenRecoveryUI::StartMenu().
     // Because WearRecoveryUI supports scrollable menu, it's fine to have
     // more entries than text_rows_. The menu may be truncated otherwise.
     // Bug: 23752519
     for (; items[i] != nullptr; i++) {
       strncpy(menu_[i], items[i], text_cols_ - 1);
       menu_[i][text_cols_ - 1] = '\0';
     }
     menu_items = i;
     show_menu = true;
     menu_sel = initial_selection;
     menu_start = 0;
     menu_end = visible_text_rows - 1 - kMenuUnusableRows;
     if (menu_items <= menu_end) menu_end = menu_items;
     update_screen_locked();
   }
   pthread_mutex_unlock(&updateMutex);
 }

 int WearRecoveryUI::SelectMenu(int sel) {
   int old_sel;
   pthread_mutex_lock(&updateMutex);
   if (show_menu) {
     old_sel = menu_sel;
     menu_sel = sel;
     if (menu_sel < 0) menu_sel = 0;
     if (menu_sel >= menu_items) menu_sel = menu_items - 1;
     if (menu_sel < menu_start) {
       menu_start--;
       menu_end--;
     } else if (menu_sel >= menu_end && menu_sel < menu_items) {
       menu_end++;
       menu_start++;
     }
     sel = menu_sel;
     if (menu_sel != old_sel) update_screen_locked();
   }
   pthread_mutex_unlock(&updateMutex);
   return sel;
 }

 void WearRecoveryUI::ShowFile(FILE* fp) {
   std::vector<off_t> offsets;
   offsets.push_back(ftello(fp));
   ClearText();

   struct stat sb;
   fstat(fileno(fp), &sb);

   bool show_prompt = false;
   while (true) {
     if (show_prompt) {
       Print("--(%d%% of %d bytes)--",
             static_cast<int>(100 * (double(ftello(fp)) / double(sb.st_size))),
             static_cast<int>(sb.st_size));
       Redraw();
       while (show_prompt) {
         show_prompt = false;
         int key = WaitKey();
         if (key == KEY_POWER || key == KEY_ENTER) {
           return;
         } else if (key == KEY_UP || key == KEY_VOLUMEUP) {
           if (offsets.size() <= 1) {
             show_prompt = true;
           } else {
             offsets.pop_back();
             fseek(fp, offsets.back(), SEEK_SET);
           }
         } else {
           if (feof(fp)) {
             return;
           }
           offsets.push_back(ftello(fp));
         }
       }
       ClearText();
     }

     int ch = getc(fp);
     if (ch == EOF) {
       text_row_ = text_top_ = text_rows_ - 2;
       show_prompt = true;
     } else {
       PutChar(ch);
       if (text_col_ == 0 && text_row_ >= text_rows_ - 2) {
         text_top_ = text_row_;
         show_prompt = true;
       }
     }
   }
 }

 void WearRecoveryUI::PutChar(char ch) {
   pthread_mutex_lock(&updateMutex);
   if (ch != '\n') text_[text_row_][text_col_++] = ch;
   if (ch == '\n' || text_col_ >= text_cols_) {
     text_col_ = 0;
     ++text_row_;
   }
   pthread_mutex_unlock(&updateMutex);
 }

 void WearRecoveryUI::ShowFile(const char* filename) {
   FILE* fp = fopen_path(filename, "re");
   if (fp == nullptr) {
     Print("  Unable to open %s: %s\n", filename, strerror(errno));
     return;
   }
   ShowFile(fp);
   fclose(fp);
 }

 void WearRecoveryUI::PrintOnScreenOnly(const char *fmt, ...) {
   va_list ap;
   va_start(ap, fmt);
   PrintV(fmt, false, ap);
   va_end(ap);
 }

 void WearRecoveryUI::PrintV(const char* fmt, bool copy_to_stdout, va_list ap) {
   std::string str;
   android::base::StringAppendV(&str, fmt, ap);

   if (copy_to_stdout) {
     fputs(str.c_str(), stdout);
   }

   pthread_mutex_lock(&updateMutex);
   if (text_rows_ > 0 && text_cols_ > 0) {
     for (const char* ptr = str.c_str(); *ptr != '\0'; ++ptr) {
       if (*ptr == '\n' || text_col_ >= text_cols_) {
         text_[text_row_][text_col_] = '\0';
         text_col_ = 0;
         text_row_ = (text_row_ + 1) % text_rows_;
         if (text_row_ == text_top_) text_top_ = (text_top_ + 1) % text_rows_;
       }
       if (*ptr != '\n') text_[text_row_][text_col_++] = *ptr;
     }
     text_[text_row_][text_col_] = '\0';
     update_screen_locked();
   }
   pthread_mutex_unlock(&updateMutex);
 }
	/*
	* Copyright (C) 2014 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "wear_ui.h"

	#include <errno.h>
	#include <fcntl.h>
	#include <pthread.h>
	#include <stdarg.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/stat.h>
	#include <sys/time.h>
	#include <sys/types.h>
	#include <time.h>
	#include <unistd.h>

	#include <string>
	#include <vector>

	#include <android-base/properties.h>
	#include <android-base/strings.h>
	#include <android-base/stringprintf.h>
	#include <minui/minui.h>

	#include "common.h"
	#include "device.h"

	// Return the current time as a double (including fractions of a second).
	static double now() {
	struct timeval tv;
	gettimeofday(&tv, NULL);
	return tv.tv_sec + tv.tv_usec / 1000000.0;
	}

	WearRecoveryUI::WearRecoveryUI()
	: kProgressBarBaseline(RECOVERY_UI_PROGRESS_BAR_BASELINE),
	kMenuUnusableRows(RECOVERY_UI_MENU_UNUSABLE_ROWS) {
	// TODO: kMenuUnusableRows should be computed based on the lines in draw_screen_locked().

	// TODO: The following three variables are likely not needed. The first two are detected
	// automatically in ScreenRecoveryUI::LoadAnimation(), based on the actual files seen on device.
	intro_frames = 22;
	loop_frames = 60;

	touch_screen_allowed_ = true;

	for (size_t i = 0; i < 5; i++) backgroundIcon[i] = NULL;
	}

	int WearRecoveryUI::GetProgressBaseline() const {
	return kProgressBarBaseline;
	}

	// Draw background frame on the screen. Does not flip pages.
	// Should only be called with updateMutex locked.
	// TODO merge drawing routines with screen_ui
	void WearRecoveryUI::draw_background_locked() {
	pagesIdentical = false;
	gr_color(0, 0, 0, 255);
	gr_fill(0, 0, gr_fb_width(), gr_fb_height());

	if (currentIcon != NONE) {
	GRSurface* surface;
	if (currentIcon == INSTALLING_UPDATE \|\| currentIcon == ERASING) {
	if (!intro_done) {
	surface = introFrames[current_frame];
	} else {
	surface = loopFrames[current_frame];
	}
	} else {
	surface = backgroundIcon[currentIcon];
	}

	int width = gr_get_width(surface);
	int height = gr_get_height(surface);

	int x = (gr_fb_width() - width) / 2;
	int y = (gr_fb_height() - height) / 2;

	gr_blit(surface, 0, 0, width, height, x, y);
	}
	}

	static const char* SWIPE_HELP[] = {
	"Swipe up/down to move.",
	"Swipe left/right to select.",
	"",
	NULL
	};

	// TODO merge drawing routines with screen_ui
	void WearRecoveryUI::draw_screen_locked() {
	char cur_selection_str[50];

	draw_background_locked();
	if (!show_text) {
	draw_foreground_locked();
	} else {
	SetColor(TEXT_FILL);
	gr_fill(0, 0, gr_fb_width(), gr_fb_height());

	int y = kMarginHeight;
	int x = kMarginWidth;
	if (show_menu) {
	std::string recovery_fingerprint =
	android::base::GetProperty("ro.bootimage.build.fingerprint", "");
	SetColor(HEADER);
	y += DrawTextLine(x + 4, y, "Android Recovery", true);
	for (auto& chunk : android::base::Split(recovery_fingerprint, ":")) {
	y += DrawTextLine(x + 4, y, chunk.c_str(), false);
	}

	// This is actually the help strings.
	y += DrawTextLines(x + 4, y, SWIPE_HELP);
	SetColor(HEADER);
	y += DrawTextLines(x + 4, y, menu_headers_);

	// Show the current menu item number in relation to total number if
	// items don't fit on the screen.
	if (menu_items > menu_end - menu_start) {
	sprintf(cur_selection_str, "Current item: %d/%d", menu_sel + 1, menu_items);
	gr_text(gr_sys_font(), x + 4, y, cur_selection_str, 1);
	y += char_height_ + 4;
	}

	// Menu begins here
	SetColor(MENU);

	for (int i = menu_start; i < menu_end; ++i) {
	if (i == menu_sel) {
	// draw the highlight bar
	SetColor(MENU_SEL_BG);
	gr_fill(x, y - 2, gr_fb_width() - x, y + char_height_ + 2);
	// white text of selected item
	SetColor(MENU_SEL_FG);
	if (menu_[i][0]) {
	gr_text(gr_sys_font(), x + 4, y, menu_[i], 1);
	}
	SetColor(MENU);
	} else if (menu_[i][0]) {
	gr_text(gr_sys_font(), x + 4, y, menu_[i], 0);
	}
	y += char_height_ + 4;
	}
	SetColor(MENU);
	y += 4;
	gr_fill(0, y, gr_fb_width(), y + 2);
	y += 4;
	}

	SetColor(LOG);

	// display from the bottom up, until we hit the top of the
	// screen, the bottom of the menu, or we've displayed the
	// entire text buffer.
	int ty;
	int row = (text_top_ + text_rows_ - 1) % text_rows_;
	size_t count = 0;
	for (int ty = gr_fb_height() - char_height_ - kMarginHeight; ty > y + 2 && count < text_rows_;
	ty -= char_height_, ++count) {
	gr_text(gr_sys_font(), x + 4, ty, text_[row], 0);
	--row;
	if (row < 0) row = text_rows_ - 1;
	}
	}
	}

	// TODO merge drawing routines with screen_ui
	void WearRecoveryUI::update_progress_locked() {
	draw_screen_locked();
	gr_flip();
	}

	bool WearRecoveryUI::InitTextParams() {
	if (!ScreenRecoveryUI::InitTextParams()) {
	return false;
	}

	text_cols_ = (gr_fb_width() - (kMarginWidth * 2)) / char_width_;

	if (text_rows_ > kMaxRows) text_rows_ = kMaxRows;
	if (text_cols_ > kMaxCols) text_cols_ = kMaxCols;

	visible_text_rows = (gr_fb_height() - (kMarginHeight * 2)) / char_height_;
	return true;
	}

	bool WearRecoveryUI::Init(const std::string& locale) {
	if (!ScreenRecoveryUI::Init(locale)) {
	return false;
	}

	LoadBitmap("icon_error", &backgroundIcon[ERROR]);
	backgroundIcon[NO_COMMAND] = backgroundIcon[ERROR];

	// This leaves backgroundIcon[INSTALLING_UPDATE] and backgroundIcon[ERASING]
	// as NULL which is fine since draw_background_locked() doesn't use them.

	return true;
	}

	void WearRecoveryUI::SetStage(int current, int max) {
	}

	void WearRecoveryUI::Print(const char* fmt, ...) {
	char buf[256];
	va_list ap;
	va_start(ap, fmt);
	vsnprintf(buf, 256, fmt, ap);
	va_end(ap);

	fputs(buf, stdout);

	// This can get called before ui_init(), so be careful.
	pthread_mutex_lock(&updateMutex);
	if (text_rows_ > 0 && text_cols_ > 0) {
	char* ptr;
	for (ptr = buf; *ptr != '\0'; ++ptr) {
	if (*ptr == '\n' \|\| text_col_ >= text_cols_) {
	text_[text_row_][text_col_] = '\0';
	text_col_ = 0;
	text_row_ = (text_row_ + 1) % text_rows_;
	if (text_row_ == text_top_) text_top_ = (text_top_ + 1) % text_rows_;
	}
	if (ptr != '\n') text_[text_row_][text_col_++] = ptr;
	}
	text_[text_row_][text_col_] = '\0';
	update_screen_locked();
	}
	pthread_mutex_unlock(&updateMutex);
	}

	void WearRecoveryUI::StartMenu(const char* const* headers, const char* const* items,
	int initial_selection) {
	pthread_mutex_lock(&updateMutex);
	if (text_rows_ > 0 && text_cols_ > 0) {
	menu_headers_ = headers;
	size_t i = 0;
	// "i < text_rows_" is removed from the loop termination condition,
	// which is different from the one in ScreenRecoveryUI::StartMenu().
	// Because WearRecoveryUI supports scrollable menu, it's fine to have
	// more entries than text_rows_. The menu may be truncated otherwise.
	// Bug: 23752519
	for (; items[i] != nullptr; i++) {
	strncpy(menu_[i], items[i], text_cols_ - 1);
	menu_[i][text_cols_ - 1] = '\0';
	}
	menu_items = i;
	show_menu = true;
	menu_sel = initial_selection;
	menu_start = 0;
	menu_end = visible_text_rows - 1 - kMenuUnusableRows;
	if (menu_items <= menu_end) menu_end = menu_items;
	update_screen_locked();
	}
	pthread_mutex_unlock(&updateMutex);
	}

	int WearRecoveryUI::SelectMenu(int sel) {
	int old_sel;
	pthread_mutex_lock(&updateMutex);
	if (show_menu) {
	old_sel = menu_sel;
	menu_sel = sel;
	if (menu_sel < 0) menu_sel = 0;
	if (menu_sel >= menu_items) menu_sel = menu_items - 1;
	if (menu_sel < menu_start) {
	menu_start--;
	menu_end--;
	} else if (menu_sel >= menu_end && menu_sel < menu_items) {
	menu_end++;
	menu_start++;
	}
	sel = menu_sel;
	if (menu_sel != old_sel) update_screen_locked();
	}
	pthread_mutex_unlock(&updateMutex);
	return sel;
	}

	void WearRecoveryUI::ShowFile(FILE* fp) {
	std::vector<off_t> offsets;
	offsets.push_back(ftello(fp));
	ClearText();

	struct stat sb;
	fstat(fileno(fp), &sb);

	bool show_prompt = false;
	while (true) {
	if (show_prompt) {
	Print("--(%d%% of %d bytes)--",
	static_cast<int>(100 * (double(ftello(fp)) / double(sb.st_size))),
	static_cast<int>(sb.st_size));
	Redraw();
	while (show_prompt) {
	show_prompt = false;
	int key = WaitKey();
	if (key == KEY_POWER \|\| key == KEY_ENTER) {
	return;
	} else if (key == KEY_UP \|\| key == KEY_VOLUMEUP) {
	if (offsets.size() <= 1) {
	show_prompt = true;
	} else {
	offsets.pop_back();
	fseek(fp, offsets.back(), SEEK_SET);
	}
	} else {
	if (feof(fp)) {
	return;
	}
	offsets.push_back(ftello(fp));
	}
	}
	ClearText();
	}

	int ch = getc(fp);
	if (ch == EOF) {
	text_row_ = text_top_ = text_rows_ - 2;
	show_prompt = true;
	} else {
	PutChar(ch);
	if (text_col_ == 0 && text_row_ >= text_rows_ - 2) {
	text_top_ = text_row_;
	show_prompt = true;
	}
	}
	}
	}

	void WearRecoveryUI::PutChar(char ch) {
	pthread_mutex_lock(&updateMutex);
	if (ch != '\n') text_[text_row_][text_col_++] = ch;
	if (ch == '\n' \|\| text_col_ >= text_cols_) {
	text_col_ = 0;
	++text_row_;
	}
	pthread_mutex_unlock(&updateMutex);
	}

	void WearRecoveryUI::ShowFile(const char* filename) {
	FILE* fp = fopen_path(filename, "re");
	if (fp == nullptr) {
	Print(" Unable to open %s: %s\n", filename, strerror(errno));
	return;
	}
	ShowFile(fp);
	fclose(fp);
	}

	void WearRecoveryUI::PrintOnScreenOnly(const char *fmt, ...) {
	va_list ap;
	va_start(ap, fmt);
	PrintV(fmt, false, ap);
	va_end(ap);
	}

	void WearRecoveryUI::PrintV(const char* fmt, bool copy_to_stdout, va_list ap) {
	std::string str;
	android::base::StringAppendV(&str, fmt, ap);

	if (copy_to_stdout) {
	fputs(str.c_str(), stdout);
	}

	pthread_mutex_lock(&updateMutex);
	if (text_rows_ > 0 && text_cols_ > 0) {
	for (const char* ptr = str.c_str(); *ptr != '\0'; ++ptr) {
	if (*ptr == '\n' \|\| text_col_ >= text_cols_) {
	text_[text_row_][text_col_] = '\0';
	text_col_ = 0;
	text_row_ = (text_row_ + 1) % text_rows_;
	if (text_row_ == text_top_) text_top_ = (text_top_ + 1) % text_rows_;
	}
	if (ptr != '\n') text_[text_row_][text_col_++] = ptr;
	}
	text_[text_row_][text_col_] = '\0';
	update_screen_locked();
	}
	pthread_mutex_unlock(&updateMutex);
	}