[PATCH] lineedit: trivial codeshrink for vi-mode

[Natanael Copa]

Introduce and use BB_isalnum_or_underscore().

bloatcheck on x86_64:
function                                             old     new   delta
BB_isalnum_or_underscore                               -      46     +46
vi_end_motion                                        176     166     -10
vi_back_motion                                       169     155     -14
vi_word_motion                                       190     172     -18
BB_isalnum                                            39       -     -39
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 0/3 up/down: 46/-81)            Total: -35
bytes

Signed-off-by: Natanael Copa <ncopa at alpinelinux.org>
---
 libbb/lineedit.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index a83e07c..507b829 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -81,6 +81,9 @@
 static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
 # if ENABLE_FEATURE_EDITING_VI
 static bool BB_isalnum(CHAR_T c) { return ((unsigned)c < 256 && isalnum(c)); }
+static bool BB_isalnum_or_underscore(CHAR_T c) {
+	return (BB_isalnum(c) || c == '_');
+}
 # endif
 static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
 # undef isspace
@@ -1572,9 +1575,9 @@ vi_word_motion(int eat)
 {
 	CHAR_T *command = command_ps;
 
-	if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
+	if (BB_isalnum_or_underscore(command[cursor])) {
 		while (cursor < command_len
-		 && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
+		 && (BB_isalnum_or_underscore(command[cursor+1]))
 		) {
 			input_forward();
 		}
@@ -1616,9 +1619,9 @@ vi_end_motion(void)
 		input_forward();
 	if (cursor >= command_len-1)
 		return;
-	if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
+	if (BB_isalnum_or_underscore(command[cursor])) {
 		while (cursor < command_len-1
-		 && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
+		 && (BB_isalnum_or_underscore(command[cursor+1]))
 		) {
 			input_forward();
 		}
@@ -1651,9 +1654,9 @@ vi_back_motion(void)
 		input_backward(1);
 	if (cursor <= 0)
 		return;
-	if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
+	if (BB_isalnum_or_underscore(command[cursor])) {
 		while (cursor > 0
-		 && (BB_isalnum(command[cursor-1]) || command[cursor-1] == '_')
+		 && (BB_isalnum_or_underscore(command[cursor-1]))
 		) {
 			input_backward(1);
 		}
-- 
2.4.1