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authorDenys Vlasenko <vda.linux@googlemail.com>2011-09-09 10:35:49 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2011-09-09 10:35:49 (GMT)
commit12e154f0cf4dba7bc508356649f8d57ec1dbef37 (patch)
tree112e0f6b63c6b82f6b04a58893bd9e9e8aeb1139
parent289c47b04921a742e94bf07006eae3f0b97acc1f (diff)
downloadbusybox-12e154f0cf4dba7bc508356649f8d57ec1dbef37.tar.gz
busybox-12e154f0cf4dba7bc508356649f8d57ec1dbef37.tar.bz2
vi: prevent unlimited recursion in do_cmd(). Closes 4153
function old new delta do_cmd 4284 4194 -90 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--editors/vi.c294
1 files changed, 139 insertions, 155 deletions
diff --git a/editors/vi.c b/editors/vi.c
index 96a0c8d..71d6008 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -3063,7 +3063,6 @@ static void refresh(int full_screen)
//----- Execute a Vi Command -----------------------------------
static void do_cmd(int c)
{
- const char *msg = msg; // for compiler
char *p, *q, *save_dot;
char buf[12];
int dir;
@@ -3072,8 +3071,8 @@ static void do_cmd(int c)
// c1 = c; // quiet the compiler
// cnt = yf = 0; // quiet the compiler
-// msg = p = q = save_dot = buf; // quiet the compiler
- memset(buf, '\0', 12);
+// p = q = save_dot = buf; // quiet the compiler
+ memset(buf, '\0', sizeof(buf));
show_status_line();
@@ -3189,19 +3188,18 @@ static void do_cmd(int c)
case KEYCODE_LEFT: // cursor key Left
case 8: // ctrl-H- move left (This may be ERASE char)
case 0x7f: // DEL- move left (This may be ERASE char)
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
- dot_left();
+ do {
+ dot_left();
+ } while (--cmdcnt > 0);
break;
case 10: // Newline ^J
case 'j': // j- goto next line, same col
case KEYCODE_DOWN: // cursor key Down
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
- dot_next(); // go to next B-o-l
- dot = move_to_col(dot, ccol + offset); // try stay in same col
+ do {
+ dot_next(); // go to next B-o-l
+ // try stay in same col
+ dot = move_to_col(dot, ccol + offset);
+ } while (--cmdcnt > 0);
break;
case 12: // ctrl-L force redraw whole screen
case 18: // ctrl-R force redraw
@@ -3214,11 +3212,10 @@ static void do_cmd(int c)
break;
case 13: // Carriage Return ^M
case '+': // +- goto next line
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
- dot_next();
- dot_skip_over_ws();
+ do {
+ dot_next();
+ dot_skip_over_ws();
+ } while (--cmdcnt > 0);
break;
case 21: // ctrl-U scroll up half screen
dot_scroll((rows - 2) / 2, -1);
@@ -3236,10 +3233,9 @@ static void do_cmd(int c)
case ' ': // move right
case 'l': // move right
case KEYCODE_RIGHT: // Cursor Key Right
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
- dot_right();
+ do {
+ dot_right();
+ } while (--cmdcnt > 0);
break;
#if ENABLE_FEATURE_VI_YANKMARK
case '"': // "- name a register to use for Delete/Yank
@@ -3321,11 +3317,12 @@ static void do_cmd(int c)
#endif /* FEATURE_VI_YANKMARK */
case '$': // $- goto end of line
case KEYCODE_END: // Cursor Key End
- if (--cmdcnt > 0) {
+ for (;;) {
+ dot = end_line(dot);
+ if (--cmdcnt > 0)
+ break;
dot_next();
- do_cmd(c);
}
- dot = end_line(dot);
break;
case '%': // %- find matching char of pair () [] {}
for (q = dot; q < end && *q != '\n'; q++) {
@@ -3350,38 +3347,35 @@ static void do_cmd(int c)
//
//**** fall through to ... ';'
case ';': // ;- look at rest of line for last forward char
- if (--cmdcnt > 0) {
- do_cmd(';');
- }
- if (last_forward_char == 0)
- break;
- q = dot + 1;
- while (q < end - 1 && *q != '\n' && *q != last_forward_char) {
- q++;
- }
- if (*q == last_forward_char)
- dot = q;
+ do {
+ if (last_forward_char == 0)
+ break;
+ q = dot + 1;
+ while (q < end - 1 && *q != '\n' && *q != last_forward_char) {
+ q++;
+ }
+ if (*q == last_forward_char)
+ dot = q;
+ } while (--cmdcnt > 0);
break;
case ',': // repeat latest 'f' in opposite direction
- if (--cmdcnt > 0) {
- do_cmd(',');
- }
if (last_forward_char == 0)
break;
- q = dot - 1;
- while (q >= text && *q != '\n' && *q != last_forward_char) {
- q--;
- }
- if (q >= text && *q == last_forward_char)
- dot = q;
+ do {
+ q = dot - 1;
+ while (q >= text && *q != '\n' && *q != last_forward_char) {
+ q--;
+ }
+ if (q >= text && *q == last_forward_char)
+ dot = q;
+ } while (--cmdcnt > 0);
break;
case '-': // -- goto prev line
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
- dot_prev();
- dot_skip_over_ws();
+ do {
+ dot_prev();
+ dot_skip_over_ws();
+ } while (--cmdcnt > 0);
break;
#if ENABLE_FEATURE_VI_DOT_CMD
case '.': // .- repeat the last modifying command
@@ -3413,9 +3407,6 @@ static void do_cmd(int c)
// user changed mind and erased the "/"- do nothing
break;
case 'N': // N- backward search for last pattern
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
dir = BACK; // assume BACKWARD search
p = dot - 1;
if (last_search_pattern[0] == '?') {
@@ -3427,41 +3418,41 @@ static void do_cmd(int c)
case 'n': // n- repeat search for last pattern
// search rest of text[] starting at next char
// if search fails return orignal "p" not the "p+1" address
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
+ do {
+ const char *msg;
dc3:
- dir = FORWARD; // assume FORWARD search
- p = dot + 1;
- if (last_search_pattern[0] == '?') {
- dir = BACK;
- p = dot - 1;
- }
+ dir = FORWARD; // assume FORWARD search
+ p = dot + 1;
+ if (last_search_pattern[0] == '?') {
+ dir = BACK;
+ p = dot - 1;
+ }
dc4:
- q = char_search(p, last_search_pattern + 1, dir, FULL);
- if (q != NULL) {
- dot = q; // good search, update "dot"
- msg = "";
- goto dc2;
- }
- // no pattern found between "dot" and "end"- continue at top
- p = text;
- if (dir == BACK) {
- p = end - 1;
- }
- q = char_search(p, last_search_pattern + 1, dir, FULL);
- if (q != NULL) { // found something
- dot = q; // found new pattern- goto it
- msg = "search hit BOTTOM, continuing at TOP";
+ q = char_search(p, last_search_pattern + 1, dir, FULL);
+ if (q != NULL) {
+ dot = q; // good search, update "dot"
+ msg = NULL;
+ goto dc2;
+ }
+ // no pattern found between "dot" and "end"- continue at top
+ p = text;
if (dir == BACK) {
- msg = "search hit TOP, continuing at BOTTOM";
+ p = end - 1;
+ }
+ q = char_search(p, last_search_pattern + 1, dir, FULL);
+ if (q != NULL) { // found something
+ dot = q; // found new pattern- goto it
+ msg = "search hit BOTTOM, continuing at TOP";
+ if (dir == BACK) {
+ msg = "search hit TOP, continuing at BOTTOM";
+ }
+ } else {
+ msg = "Pattern not found";
}
- } else {
- msg = "Pattern not found";
- }
dc2:
- if (*msg)
- status_line_bold("%s", msg);
+ if (msg)
+ status_line_bold("%s", msg);
+ } while (--cmdcnt > 0);
break;
case '{': // {- move backward paragraph
q = char_search(dot, "\n\n", BACK, FULL);
@@ -3580,18 +3571,17 @@ static void do_cmd(int c)
case 'B': // B- back a blank-delimited Word
case 'E': // E- end of a blank-delimited word
case 'W': // W- forward a blank-delimited word
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
dir = FORWARD;
if (c == 'B')
dir = BACK;
- if (c == 'W' || isspace(dot[dir])) {
- dot = skip_thing(dot, 1, dir, S_TO_WS);
- dot = skip_thing(dot, 2, dir, S_OVER_WS);
- }
- if (c != 'W')
- dot = skip_thing(dot, 1, dir, S_BEFORE_WS);
+ do {
+ if (c == 'W' || isspace(dot[dir])) {
+ dot = skip_thing(dot, 1, dir, S_TO_WS);
+ dot = skip_thing(dot, 2, dir, S_OVER_WS);
+ }
+ if (c != 'W')
+ dot = skip_thing(dot, 1, dir, S_BEFORE_WS);
+ } while (--cmdcnt > 0);
break;
case 'C': // C- Change to e-o-l
case 'D': // D- delete to e-o-l
@@ -3642,20 +3632,19 @@ static void do_cmd(int c)
case 'i': // i- insert before current char
case KEYCODE_INSERT: // Cursor Key Insert
dc_i:
- cmd_mode = 1; // start insrting
+ cmd_mode = 1; // start inserting
break;
case 'J': // J- join current and next lines together
- if (--cmdcnt > 1) {
- do_cmd(c);
- }
- dot_end(); // move to NL
- if (dot < end - 1) { // make sure not last char in text[]
- *dot++ = ' '; // replace NL with space
- file_modified++;
- while (isblank(*dot)) { // delete leading WS
- dot_delete();
+ do {
+ dot_end(); // move to NL
+ if (dot < end - 1) { // make sure not last char in text[]
+ *dot++ = ' '; // replace NL with space
+ file_modified++;
+ while (isblank(*dot)) { // delete leading WS
+ dot_delete();
+ }
}
- }
+ } while (--cmdcnt > 0);
end_cmd_q(); // stop adding to q
break;
case 'L': // L- goto bottom line on screen
@@ -3699,20 +3688,19 @@ static void do_cmd(int c)
case 'X': // X- delete char before dot
case 'x': // x- delete the current char
case 's': // s- substitute the current char
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
dir = 0;
if (c == 'X')
dir = -1;
- if (dot[dir] != '\n') {
- if (c == 'X')
- dot--; // delete prev char
- dot = yank_delete(dot, dot, 0, YANKDEL); // delete char
- }
- if (c == 's')
- goto dc_i; // start insrting
+ do {
+ if (dot[dir] != '\n') {
+ if (c == 'X')
+ dot--; // delete prev char
+ dot = yank_delete(dot, dot, 0, YANKDEL); // delete char
+ }
+ } while (--cmdcnt > 0);
end_cmd_q(); // stop adding to q
+ if (c == 's')
+ goto dc_i; // start inserting
break;
case 'Z': // Z- if modified, {write}; exit
// ZZ means to save file (if necessary), then exit
@@ -3743,23 +3731,22 @@ static void do_cmd(int c)
break;
case 'b': // b- back a word
case 'e': // e- end of word
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
dir = FORWARD;
if (c == 'b')
dir = BACK;
- if ((dot + dir) < text || (dot + dir) > end - 1)
- break;
- dot += dir;
- if (isspace(*dot)) {
- dot = skip_thing(dot, (c == 'e') ? 2 : 1, dir, S_OVER_WS);
- }
- if (isalnum(*dot) || *dot == '_') {
- dot = skip_thing(dot, 1, dir, S_END_ALNUM);
- } else if (ispunct(*dot)) {
- dot = skip_thing(dot, 1, dir, S_END_PUNCT);
- }
+ do {
+ if ((dot + dir) < text || (dot + dir) > end - 1)
+ break;
+ dot += dir;
+ if (isspace(*dot)) {
+ dot = skip_thing(dot, (c == 'e') ? 2 : 1, dir, S_OVER_WS);
+ }
+ if (isalnum(*dot) || *dot == '_') {
+ dot = skip_thing(dot, 1, dir, S_END_ALNUM);
+ } else if (ispunct(*dot)) {
+ dot = skip_thing(dot, 1, dir, S_END_PUNCT);
+ }
+ } while (--cmdcnt > 0);
break;
case 'c': // c- change something
case 'd': // d- delete something
@@ -3844,11 +3831,10 @@ static void do_cmd(int c)
}
case 'k': // k- goto prev line, same col
case KEYCODE_UP: // cursor key Up
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
- dot_prev();
- dot = move_to_col(dot, ccol + offset); // try stay in same col
+ do {
+ dot_prev();
+ dot = move_to_col(dot, ccol + offset); // try stay in same col
+ } while (--cmdcnt > 0);
break;
case 'r': // r- replace the current char with user input
c1 = get_one_char(); // get the replacement char
@@ -3866,19 +3852,18 @@ static void do_cmd(int c)
last_forward_char = 0;
break;
case 'w': // w- forward a word
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
- if (isalnum(*dot) || *dot == '_') { // we are on ALNUM
- dot = skip_thing(dot, 1, FORWARD, S_END_ALNUM);
- } else if (ispunct(*dot)) { // we are on PUNCT
- dot = skip_thing(dot, 1, FORWARD, S_END_PUNCT);
- }
- if (dot < end - 1)
- dot++; // move over word
- if (isspace(*dot)) {
- dot = skip_thing(dot, 2, FORWARD, S_OVER_WS);
- }
+ do {
+ if (isalnum(*dot) || *dot == '_') { // we are on ALNUM
+ dot = skip_thing(dot, 1, FORWARD, S_END_ALNUM);
+ } else if (ispunct(*dot)) { // we are on PUNCT
+ dot = skip_thing(dot, 1, FORWARD, S_END_PUNCT);
+ }
+ if (dot < end - 1)
+ dot++; // move over word
+ if (isspace(*dot)) {
+ dot = skip_thing(dot, 2, FORWARD, S_OVER_WS);
+ }
+ } while (--cmdcnt > 0);
break;
case 'z': // z-
c1 = get_one_char(); // get the replacement char
@@ -3894,17 +3879,16 @@ static void do_cmd(int c)
dot = move_to_col(dot, cmdcnt - 1); // try to move to column
break;
case '~': // ~- flip the case of letters a-z -> A-Z
- if (--cmdcnt > 0) {
- do_cmd(c);
- }
- if (islower(*dot)) {
- *dot = toupper(*dot);
- file_modified++;
- } else if (isupper(*dot)) {
- *dot = tolower(*dot);
- file_modified++;
- }
- dot_right();
+ do {
+ if (islower(*dot)) {
+ *dot = toupper(*dot);
+ file_modified++;
+ } else if (isupper(*dot)) {
+ *dot = tolower(*dot);
+ file_modified++;
+ }
+ dot_right();
+ } while (--cmdcnt > 0);
end_cmd_q(); // stop adding to q
break;
//----- The Cursor and Function Keys -----------------------------