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vi: detect and warn about invalid line addresses

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BusyBox vi didn't have proper handling for invalid markers or
unsuccessful searches in colon line addresses.  This could result
in the wrong lines being affected by a change.

Detect when an invalid address is specified, propagate an error
indicator up the call chain and issue a warning.

function                                             old     new   delta
colon                                               3604    3661     +57
.rodata                                           105195  105211     +16
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 73/0)               Total: 73 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Ron Yorston 2021-04-15 12:05:45 +01:00 committed by Denys Vlasenko
parent 5d1bb58b13
commit d488def0e4
1 changed files with 14 additions and 8 deletions
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20
editors/vi.c
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@ -2360,15 +2360,16 @@ static char *get_one_address(char *p, int *addr) // get colon addr, if present
p++;
c = tolower(*p);
p++;
q = NULL;
if (c >= 'a' && c <= 'z') {
// we have a mark
c = c - 'a';
q = mark[(unsigned char) c];
if (q != NULL) { // is mark valid
}
if (q == NULL) // is mark valid
return NULL;
*addr = count_lines(text, q);
}
}
}
# endif
# if ENABLE_FEATURE_VI_SEARCH
else if (*p == '/') { // a search pattern
@ -2383,10 +2384,10 @@ static char *get_one_address(char *p, int *addr) // get colon addr, if present
p++;
q = char_search(next_line(dot), last_search_pattern + 1,
(FORWARD << 1) | FULL);
if (q != NULL) {
if (q == NULL)
return NULL;
*addr = count_lines(text, q);
}
}
# endif
else if (*p == '$') { // the last line in file
p++;
@ -2422,6 +2423,8 @@ static char *get_address(char *p, int *b, int *e) // get two colon addrs, if pre
state = GET_SECOND;
} else if (state == GET_FIRST || state == GET_SECOND) {
p = get_one_address(p, state == GET_FIRST ? b : e);
if (p == NULL)
break;
state |= GOT;
} else {
break;
@ -2536,9 +2539,7 @@ static void colon(char *buf)
char *fn, cmd[MAX_INPUT_LEN], args[MAX_INPUT_LEN];
int i, l, li, b, e;
int useforce;
# if ENABLE_FEATURE_VI_SEARCH || ENABLE_FEATURE_ALLOW_EXEC
char *orig_buf;
# endif
// :3154 // if (-e line 3154) goto it else stay put
// :4,33w! foo // write a portion of buffer to file "foo"
@ -2568,7 +2569,12 @@ static void colon(char *buf)
fn = current_filename;
// look for optional address(es) :. :1 :1,9 :'q,'a :%
orig_buf = buf;
buf = get_address(buf, &b, &e);
if (buf == NULL) {
status_line_bold("Bad address: %s", orig_buf);
goto ret;
}
# if ENABLE_FEATURE_VI_SEARCH || ENABLE_FEATURE_ALLOW_EXEC
// remember orig command line