*: introduce and use ffulsh_all()

function                                             old     new   delta
buffer_fill_and_print                                179     196     +17
fflush_all                                             -       9      +9
spawn                                                 87      92      +5
rtcwake_main                                         455     453      -2
...
alarm_intr                                            93      84      -9
readcmd                                             1072    1062     -10
bb_ask                                               345     333     -12
more_main                                            845     832     -13
flush_stdout_stderr                                   42      23     -19
xfflush_stdout                                        27       -     -27
flush_stderr                                          30       -     -30
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 2/50 up/down: 31/-397)         Total: -366 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

libbb/bb_askpass.c

@@ -55,7 +55,7 @@ char* FAST_FUNC bb_ask(const int fd, int timeout, const char *prompt)
 	}
 
 	fputs(prompt, stdout);
-	fflush(stdout);
+	fflush_all();
 	ret = NULL;
 	/* On timeout or Ctrl-C, read will hopefully be interrupted,
 	 * and we return NULL */
@@ -77,6 +77,6 @@ char* FAST_FUNC bb_ask(const int fd, int timeout, const char *prompt)
 
 	tcsetattr_stdin_TCSANOW(&oldtio);
 	bb_putchar('\n');
-	fflush(stdout);
+	fflush_all();
 	return ret;
 }

libbb/info_msg.c

@@ -44,7 +44,7 @@ void FAST_FUNC bb_info_msg(const char *s, ...)
 	if (ENABLE_FEATURE_SYSLOG && (logmode & LOGMODE_SYSLOG))
 		syslog(LOG_INFO, "%s", msg);
 	if (logmode & LOGMODE_STDIO) {
-		fflush(stdout);
+		fflush_all();
 		/* used = strlen(msg); - must be true already */
 		msg[used++] = '\n';
 		full_write(STDOUT_FILENO, msg, used);

libbb/lineedit.c

@@ -373,7 +373,7 @@ static void input_backward(unsigned num)
 static void put_prompt(void)
 {
 	out1str(cmdedit_prompt);
-	fflush(NULL);
+	fflush_all();
 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
 	{
 		/* Ask terminal where is the cursor now.
@@ -411,7 +411,7 @@ static void put_prompt(void)
 		if (safe_poll(&pfd, 1, 0) == 0) {
 			S.sent_ESC_br6n = 1;
 			out1str("\033" "[6n");
-			fflush(NULL); /* make terminal see it ASAP! */
+			fflush_all(); /* make terminal see it ASAP! */
 		}
 	}
 #endif
@@ -1636,7 +1636,7 @@ static void cmdedit_setwidth(unsigned w, int redraw_flg)
 		int new_y = (cursor + cmdedit_prmt_len) / w;
 		/* redraw */
 		redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
-		fflush(NULL);
+		fflush_all();
 	}
 }
 
@@ -1748,7 +1748,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
 	) {
 		/* Happens when e.g. stty -echo was run before */
 		parse_and_put_prompt(prompt);
-		/* fflush(stdout); - done by parse_and_put_prompt */
+		/* fflush_all(); - done by parse_and_put_prompt */
 		if (fgets(command, maxsize, stdin) == NULL)
 			len = -1; /* EOF or error */
 		else
@@ -1841,7 +1841,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
 		};
 		int32_t ic, ic_raw;
 
-		fflush(NULL);
+		fflush_all();
 		ic = ic_raw = lineedit_read_key(read_key_buffer);
 
 #if ENABLE_FEATURE_EDITING_VI
@@ -2245,7 +2245,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
 	tcsetattr_stdin_TCSANOW(&initial_settings);
 	/* restore SIGWINCH handler */
 	signal(SIGWINCH, previous_SIGWINCH_handler);
-	fflush(NULL);
+	fflush_all();
 
 	len = command_len;
 	DEINIT_S();
@@ -2259,7 +2259,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
 int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
 {
 	fputs(prompt, stdout);
-	fflush(NULL);
+	fflush_all();
 	fgets(command, maxsize, stdin);
 	return strlen(command);
 }

libbb/login.c

@@ -85,7 +85,7 @@ void FAST_FUNC print_login_issue(const char *issue_file, const char *tty)
 		fputs(outbuf, stdout);
 	}
 	fclose(fp);
-	fflush(stdout);
+	fflush_all();
 }
 
 void FAST_FUNC print_login_prompt(void)
@@ -94,7 +94,7 @@ void FAST_FUNC print_login_prompt(void)
 
 	fputs(hostname, stdout);
 	fputs(LOGIN, stdout);
-	fflush(stdout);
+	fflush_all();
 	free(hostname);
 }
 

libbb/verror_msg.c

@@ -64,7 +64,7 @@ void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
 	}
 
 	if (logmode & LOGMODE_STDIO) {
-		fflush(stdout);
+		fflush_all();
 		full_write(STDERR_FILENO, msg, used);
 	}
 	if (logmode & LOGMODE_SYSLOG) {
@@ -125,8 +125,8 @@ void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
 		iov[1].iov_len = 2;
 		/*iov[2].iov_base = msgc;*/
 		/*iov[2].iov_len = used;*/
-		fflush(stdout);
-		writev(2, iov, 3);
+		fflush_all();
+		writev(STDERR_FILENO, iov, 3);
 	}
 	if (logmode & LOGMODE_SYSLOG) {
 		syslog(LOG_ERR, "%s", msgc);

libbb/vfork_daemon_rexec.c

@@ -25,7 +25,7 @@ pid_t FAST_FUNC spawn(char **argv)
 	volatile int failed;
 	pid_t pid;
 
-// Ain't it a good place to fflush(NULL)?
+	fflush_all();
 
 	/* Be nice to nommu machines. */
 	failed = 0;

libbb/xfuncs_printf.c

@@ -255,12 +255,9 @@ void FAST_FUNC die_if_ferror_stdout(void)
 	die_if_ferror(stdout, bb_msg_standard_output);
 }
 
-// Die with an error message if we have trouble flushing stdout.
-void FAST_FUNC xfflush_stdout(void)
+int FAST_FUNC fflush_all(void)
 {
-	if (fflush(stdout)) {
-		bb_perror_msg_and_die(bb_msg_standard_output);
-	}
+	return fflush(NULL);
 }
 
 
@@ -276,9 +273,9 @@ int FAST_FUNC bb_putchar(int ch)
  * then close that file. */
 void FAST_FUNC xprint_and_close_file(FILE *file)
 {
-	fflush(stdout);
+	fflush_all();
 	// copyfd outputs error messages for us.
-	if (bb_copyfd_eof(fileno(file), 1) == -1)
+	if (bb_copyfd_eof(fileno(file), STDOUT_FILENO) == -1)
 		xfunc_die();
 
 	fclose(file);