xargs: use bb_ask_y_confirmation_FILE() instead of homegrown copy

function                                             old     new   delta
bb_ask_y_confirmation_FILE                             -      83     +83
inetd_main                                          2033    2043     +10
udhcp_send_kernel_packet                             295     301      +6
rmescapes                                            306     310      +4
send_tree                                            353     355      +2
i2cdetect_main                                       674     672      -2
confirm_or_abort                                      43      38      -5
get_terminal_width_height                            242     234      -8
bb_ask_y_confirmation                                 76      10     -66
xargs_main                                           823     755     -68
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 4/5 up/down: 105/-149)          Total: -44 bytes

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

5 files changed, 20 insertions, 13 deletions

diff --git a/findutils/xargs.c b/findutils/xargs.c
index 117a39b..1d85d50 100644
--- a/findutils/xargs.c
+++ b/findutils/xargs.c
@@ -496,16 +496,16 @@ static char* FAST_FUNC process_stdin_with_replace(int n_max_chars, int n_max_arg
 static int xargs_ask_confirmation(void)
 {
 	FILE *tty_stream;
-	int c, savec;
+	int r;
 
 	tty_stream = xfopen_for_read(CURRENT_TTY);
+
 	fputs(" ?...", stderr);
-	fflush_all();
-	c = savec = getc(tty_stream);
-	while (c != EOF && c != '\n')
-		c = getc(tty_stream);
+	r = bb_ask_y_confirmation_FILE(tty_stream);
+
 	fclose(tty_stream);
-	return (savec == 'y' || savec == 'Y');
+
+	return r;
 }
 #else
 # define xargs_ask_confirmation() 1
diff --git a/include/libbb.h b/include/libbb.h
index c7e830c..5388d9d 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1412,6 +1412,7 @@ extern int set_loop(char **devname, const char *file, unsigned long long offset,
 char *bb_ask_noecho_stdin(const char *prompt) FAST_FUNC;
 //TODO: pass buf pointer or return allocated buf (avoid statics)?
 char *bb_ask_noecho(const int fd, int timeout, const char *prompt) FAST_FUNC;
+int bb_ask_y_confirmation_FILE(FILE *fp) FAST_FUNC;
 int bb_ask_y_confirmation(void) FAST_FUNC;
 
 /* Returns -1 if input is invalid. current_mode is a base for e.g. "u+rw" */
diff --git a/libbb/ask_confirmation.c b/libbb/ask_confirmation.c
index ccd983c..e4814e2 100644
--- a/libbb/ask_confirmation.c
+++ b/libbb/ask_confirmation.c
@@ -8,15 +8,16 @@
  */
 #include "libbb.h"
 
-/* Read a line from stdin.  If the first non-whitespace char is 'y' or 'Y',
+/* Read a line from fp.  If the first non-whitespace char is 'y' or 'Y',
  * return 1.  Otherwise return 0.
  */
-int FAST_FUNC bb_ask_y_confirmation(void)
+int FAST_FUNC bb_ask_y_confirmation_FILE(FILE *fp)
 {
 	char first = 0;
 	int c;
 
-	while (((c = getchar()) != EOF) && (c != '\n')) {
+	fflush_all();
+	while (((c = fgetc(fp)) != EOF) && (c != '\n')) {
 		if (first == 0 && !isblank(c)) {
 			first = c|0x20;
 		}
@@ -24,3 +25,8 @@ int FAST_FUNC bb_ask_y_confirmation(void)
 
 	return first == 'y';
 }
+
+int FAST_FUNC bb_ask_y_confirmation(void)
+{
+	return bb_ask_y_confirmation_FILE(stdin);
+}
diff --git a/libbb/remove_file.c b/libbb/remove_file.c
index 074ffae..86c9a5c 100644
--- a/libbb/remove_file.c
+++ b/libbb/remove_file.c
@@ -39,8 +39,8 @@ int FAST_FUNC remove_file(const char *path, int flags)
 		if ((!(flags & FILEUTILS_FORCE) && access(path, W_OK) < 0 && isatty(0))
 		 || (flags & FILEUTILS_INTERACTIVE)
 		) {
-			fprintf(stderr, "%s: descend into directory '%s'? ", applet_name,
-					path);
+			fprintf(stderr, "%s: descend into directory '%s'? ",
+					applet_name, path);
 			if (!bb_ask_y_confirmation())
 				return 0;
 		}
@@ -67,7 +67,8 @@ int FAST_FUNC remove_file(const char *path, int flags)
 		}
 
 		if (flags & FILEUTILS_INTERACTIVE) {
-			fprintf(stderr, "%s: remove directory '%s'? ", applet_name, path);
+			fprintf(stderr, "%s: remove directory '%s'? ",
+					applet_name, path);
 			if (!bb_ask_y_confirmation())
 				return status;
 		}
diff --git a/miscutils/i2c_tools.c b/miscutils/i2c_tools.c
index 8b201c0..6a21340 100644
--- a/miscutils/i2c_tools.c
+++ b/miscutils/i2c_tools.c
@@ -421,7 +421,6 @@ static void check_write_funcs(int fd, int mode, int pec)
 static void confirm_or_abort(void)
 {
 	fprintf(stderr, "Continue? [y/N] ");
-	fflush_all();
 	if (!bb_ask_y_confirmation())
 		bb_error_msg_and_die("aborting");
 }