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List: busybox
Subject: [PATCH 3/3] vi: reject change command when motion fails
From: Ron Yorston <rmy () pobox ! com>
Date: 2021-06-16 13:47:00
Message-ID: 60ca00d4.SctMER8aurwKHdR1%rmy () pobox ! com
[Download RAW message or body]
If the motion command used to define the range of a change, yank or
delete fails the whole command should be rejected. BusyBox vi already
handled failed searches in these circumstances. Add some more cases:
- non-existent mark: d'x
- movement beyond end of file: c99999+ or 99999<<
This is implemented using a global variable which is set when a command
error is detected. Unlike the case of motion within a line it's
insufficient to check that the motion command doesn't move the cursor:
this fails to process 'LyL' correctly, for example, as the second 'L'
doesn't move the cursor.
function old new delta
indicate_error 75 82 +7
find_range 686 692 +6
do_cmd 4851 4852 +1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 14/0) Total: 14 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
---
editors/vi.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/editors/vi.c b/editors/vi.c
index 231c62809..b06270dfd 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -378,6 +378,7 @@ struct globals {
#if ENABLE_FEATURE_VI_SETOPTS
int indentcol; // column of recently autoindent, 0 or -1
#endif
+ smallint cmd_error;
// former statics
#if ENABLE_FEATURE_VI_YANKMARK
@@ -502,6 +503,7 @@ struct globals {
#define dotcnt (G.dotcnt )
#define last_search_pattern (G.last_search_pattern)
#define indentcol (G.indentcol )
+#define cmd_error (G.cmd_error )
#define edit_file__cur_line (G.edit_file__cur_line)
#define refresh__old_offset (G.refresh__old_offset)
@@ -1099,6 +1101,7 @@ static void indicate_error(void)
if (crashme > 0)
return;
#endif
+ cmd_error = TRUE;
if (!err_method) {
write1(ESC_BELL);
} else {
@@ -3399,8 +3402,11 @@ static int find_range(char **start, char **stop, int cmd)
#endif
// these cmds operate on whole lines
buftype = WHOLE;
- if (--cmdcnt > 0)
+ if (--cmdcnt > 0) {
do_cmd('j');
+ if (cmd_error)
+ buftype = -1;
+ }
} else if (strchr("^%$0bBeEfFtThnN/?|{}\b\177", c)) {
// Most operate on char positions within a line. Of those that
// don't '%' needs no special treatment, search commands are
@@ -3430,6 +3436,8 @@ static int find_range(char **start, char **stop, int cmd)
// these operate on whole lines
buftype = WHOLE;
do_cmd(c); // execute movement cmd
+ if (cmd_error)
+ buftype = -1;
} else if (c == ' ' || c == 'l') {
// forward motion by character
int tmpcnt = (cmdcnt ?: 1);
@@ -3515,6 +3523,7 @@ static void do_cmd(int c)
// p = q = save_dot = buf; // quiet the compiler
memset(buf, '\0', sizeof(buf));
keep_index = FALSE;
+ cmd_error = FALSE;
show_status_line();
@@ -3699,6 +3708,8 @@ static void do_cmd(int c)
dot = q;
dot_begin(); // go to B-o-l
dot_skip_over_ws();
+ } else {
+ indicate_error();
}
} else if (c1 == '\'') { // goto previous context
dot = swap_context(dot); // swap current and previous context
--
2.31.1
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