[git commit master] lineedit: change how cmdedit_set_out_char works
Denys Vlasenko
vda.linux at googlemail.com
Tue May 11 12:49:13 UTC 2010
commit: http://git.busybox.net/busybox/commit/?id=94043e8ad2d30cc2199b35d18c853314ade174a3
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master
Rename two badly names functions, use "clear to end of screen"
to eliminate annoying problems with clearing wide/combining chars,
and such. Run tested.
function old new delta
put_cur_glyph_and_inc_cursor - 124 +124
put_till_end_and_adv_cursor - 24 +24
input_delete 125 130 +5
Ceos 5 4 -1
Ceol 5 4 -1
input_end 24 - -24
cmdedit_set_out_char 122 - -122
------------------------------------------------------------------------------
(add/remove: 2/2 grow/shrink: 1/2 up/down: 153/-148) Total: 5 bytes
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
editors/vi.c | 4 +-
libbb/lineedit.c | 73 ++++++++++++++++++++++++++++++-----------------------
2 files changed, 43 insertions(+), 34 deletions(-)
diff --git a/editors/vi.c b/editors/vi.c
index d3a35e7..b8cacb4 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -65,8 +65,8 @@ static const char SOn[] ALIGN1 = "\033[0m";
/* terminal bell sequence */
static const char bell[] ALIGN1 = "\007";
/* Clear-end-of-line and Clear-end-of-screen ESC sequence */
-static const char Ceol[] ALIGN1 = "\033[0K";
-static const char Ceos[] ALIGN1 = "\033[0J";
+static const char Ceol[] ALIGN1 = "\033[K";
+static const char Ceos[] ALIGN1 = "\033[J";
/* Cursor motion arbitrary destination ESC sequence */
static const char CMrc[] ALIGN1 = "\033[%d;%dH";
/* Cursor motion up and down ESC sequence */
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 622f9dd..7fffe7b 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -66,6 +66,10 @@
#endif
+#define SEQ_CLEAR_TILL_END_OF_SCREEN "\033[J"
+//#define SEQ_CLEAR_TILL_END_OF_LINE "\033[K"
+
+
#undef CHAR_T
#if ENABLE_UNICODE_SUPPORT
# define BB_NUL ((wchar_t)0)
@@ -221,13 +225,13 @@ static size_t load_string(const char *src, int maxsize)
}
static unsigned save_string(char *dst, unsigned maxsize)
{
-#if !ENABLE_UNICODE_PRESERVE_BROKEN
+# if !ENABLE_UNICODE_PRESERVE_BROKEN
ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
if (len < 0)
len = 0;
dst[len] = '\0';
return len;
-#else
+# else
unsigned dstpos = 0;
unsigned srcpos = 0;
@@ -256,7 +260,7 @@ static unsigned save_string(char *dst, unsigned maxsize)
}
dst[dstpos] = '\0';
return dstpos;
-#endif
+# endif
}
/* I thought just fputwc(c, stdout) would work. But no... */
static void BB_PUTCHAR(wchar_t c)
@@ -293,19 +297,19 @@ static void save_string(char *dst, unsigned maxsize)
* Advance cursor on screen. If we reached right margin, scroll text up
* and remove terminal margin effect by printing 'next_char' */
#define HACK_FOR_WRONG_WIDTH 1
-#if HACK_FOR_WRONG_WIDTH
-static void cmdedit_set_out_char(void)
-#define cmdedit_set_out_char(next_char) cmdedit_set_out_char()
-#else
-static void cmdedit_set_out_char(int next_char)
-#endif
+static void put_cur_glyph_and_inc_cursor(void)
{
CHAR_T c = command_ps[cursor];
if (c == BB_NUL) {
/* erase character after end of input string */
c = ' ';
+ } else {
+ /* advance cursor only if we aren't at the end yet */
+ cursor++;
+ cmdedit_x++;
}
+
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
/* Display non-printable characters in reverse */
if (!BB_isprint(c)) {
@@ -321,7 +325,7 @@ static void cmdedit_set_out_char(int next_char)
{
BB_PUTCHAR(c);
}
- if (++cmdedit_x >= cmdedit_termw) {
+ if (cmdedit_x >= cmdedit_termw) {
/* terminal is scrolled down */
cmdedit_y++;
cmdedit_x = 0;
@@ -335,27 +339,32 @@ static void cmdedit_set_out_char(int next_char)
* this will break things: there will be one extra empty line */
puts("\r"); /* + implicit '\n' */
#else
- /* Works ok only if cmdedit_termw is correct */
- /* destroy "(auto)margin" */
- bb_putchar(next_char);
+ /* VT-10x terminals don't wrap cursor to next line when last char
+ * on the line is printed - cursor stays "over" this char.
+ * Need to print _next_ char too (first one to appear on next line)
+ * to make cursor move down to next line.
+ */
+ /* Works ok only if cmdedit_termw is correct. */
+ c = command_ps[cursor];
+ if (c == BB_NUL)
+ c = ' ';
+ BB_PUTCHAR(c);
bb_putchar('\b');
#endif
}
-// Huh? What if command_ps[cursor] == BB_NUL (we are at the end already?)
- cursor++;
}
/* Move to end of line (by printing all chars till the end) */
-static void input_end(void)
+static void put_till_end_and_adv_cursor(void)
{
while (cursor < command_len)
- cmdedit_set_out_char(' ');
+ put_cur_glyph_and_inc_cursor();
}
/* Go to the next line */
static void goto_new_line(void)
{
- input_end();
+ put_till_end_and_adv_cursor();
if (cmdedit_x)
bb_putchar('\n');
}
@@ -433,8 +442,8 @@ static void redraw(int y, int back_cursor)
printf("\033[%uA", y);
bb_putchar('\r');
put_prompt();
- input_end(); /* rewrite */
- printf("\033[J"); /* erase after cursor */
+ put_till_end_and_adv_cursor();
+ printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
input_backward(back_cursor);
}
@@ -468,8 +477,9 @@ static void input_delete(int save)
* simplified into (command_len - j) */
(command_len - j) * sizeof(command_ps[0]));
command_len--;
- input_end(); /* rewrite new line */
- cmdedit_set_out_char(' '); /* erase char */
+ put_till_end_and_adv_cursor();
+ /* Last char is still visible, erase it (and more) */
+ printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
input_backward(cursor - j); /* back to old pos cursor */
}
@@ -487,7 +497,7 @@ static void put(void)
(command_len - cursor + 1) * sizeof(command_ps[0]));
memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
command_len += j;
- input_end(); /* rewrite new line */
+ put_till_end_and_adv_cursor();
input_backward(cursor - ocursor - j + 1); /* at end of new text */
}
#endif
@@ -505,7 +515,7 @@ static void input_backspace(void)
static void input_forward(void)
{
if (cursor < command_len)
- cmdedit_set_out_char(command_ps[cursor + 1]);
+ put_cur_glyph_and_inc_cursor();
}
#if ENABLE_FEATURE_TAB_COMPLETION
@@ -1955,7 +1965,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
case CTRL('E'):
vi_case('$'|VI_CMDMODE_BIT:)
/* Control-e -- End of line */
- input_end();
+ put_till_end_and_adv_cursor();
break;
case CTRL('F'):
vi_case('l'|VI_CMDMODE_BIT:)
@@ -1984,12 +1994,12 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
/* Control-k -- clear to end of line */
command_ps[cursor] = BB_NUL;
command_len = cursor;
- printf("\033[J");
+ printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
break;
case CTRL('L'):
vi_case(CTRL('L')|VI_CMDMODE_BIT:)
/* Control-l -- clear screen */
- printf("\033[H");
+ printf("\033[H"); /* cursor to top,left */
redraw(0, command_len - cursor);
break;
#if MAX_HISTORY > 0
@@ -2040,7 +2050,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
vi_cmdmode = 0;
break;
case 'A'|VI_CMDMODE_BIT:
- input_end();
+ put_till_end_and_adv_cursor();
vi_cmdmode = 0;
break;
case 'x'|VI_CMDMODE_BIT:
@@ -2200,7 +2210,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
input_backward(cursor);
break;
case KEYCODE_END:
- input_end();
+ put_till_end_and_adv_cursor();
break;
default:
@@ -2260,7 +2270,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
/* We are at the end, append */
command_ps[cursor] = ic;
command_ps[cursor + 1] = BB_NUL;
- cmdedit_set_out_char(' ');
+ put_cur_glyph_and_inc_cursor();
if (unicode_bidi_isrtl(ic))
input_backward(1);
} else {
@@ -2273,8 +2283,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
/* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
if (!isrtl_str())
sc++; /* no */
- /* rewrite from cursor */
- input_end();
+ put_till_end_and_adv_cursor();
/* to prev x pos + 1 */
input_backward(cursor - sc);
}
--
1.6.3.3
More information about the busybox-cvs
mailing list