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lineedit: remove pos_buf[] array (up to 16k!); fix compat bugs
pos_buf is a strange hack, easy to do without it. This also allows lines >32k long to be handled. Also simplified match prefix generations and made behavior more like bash. function old new delta remove_chunk - 43 +43 collapse_pos 79 - -79 build_match_prefix 804 579 -225 ------------------------------------------------------------------------------ (add/remove: 1/1 grow/shrink: 0/1 up/down: 43/-304) Total: -261 bytes Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Denys Vlasenko
parent
3c460b005c
commit
81254ed387
132
libbb/lineedit.c
132
libbb/lineedit.c
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@ -99,7 +99,6 @@ static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
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enum {
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/* We use int16_t for positions, need to limit line len */
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MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
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? CONFIG_FEATURE_EDITING_MAX_LEN
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: 0x7ff0
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@ -156,7 +155,6 @@ struct lineedit_statics {
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#if ENABLE_FEATURE_TAB_COMPLETION
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char input_tab__matchBuf[MAX_LINELEN];
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int16_t find_match__int_buf[MAX_LINELEN + 1]; /* need to have 9 bits at least */
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int16_t find_match__pos_buf[MAX_LINELEN + 1];
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#endif
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};
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@ -824,15 +822,16 @@ static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
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*/
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#define QUOT (UCHAR_MAX+1)
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#define int_buf (S.find_match__int_buf)
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#define pos_buf (S.find_match__pos_buf)
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#define dbg_bmp 0
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static void collapse_pos(int beg, int end)
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static void remove_chunk(int beg, int end)
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{
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/* beg must be <= end */
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if (beg == end)
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return;
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memmove(int_buf+beg, int_buf+end, (MAX_LINELEN+1-end) * sizeof(int_buf[0]));
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memmove(pos_buf+beg, pos_buf+end, (MAX_LINELEN+1-end) * sizeof(pos_buf[0]));
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while ((int_buf[beg] = int_buf[end]) != 0)
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beg++, end++;
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if (dbg_bmp) {
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int i;
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for (i = 0; int_buf[i]; i++)
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@ -846,42 +845,39 @@ static NOINLINE int build_match_prefix(char *matchBuf)
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int command_mode;
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/* Were local, but it used too much stack */
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/* int16_t int_buf[MAX_LINELEN + 1]; */
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/* int16_t pos_buf[MAX_LINELEN + 1]; */
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if (dbg_bmp) printf("\n%s\n", matchBuf);
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for (i = 0;; i++) {
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int_buf[i] = (unsigned char)matchBuf[i];
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if (int_buf[i] == 0) {
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pos_buf[i] = -1; /* end-of-line indicator */
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break;
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}
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pos_buf[i] = i;
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}
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i = 0;
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while ((int_buf[i] = (unsigned char)matchBuf[i]) != '\0')
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i++;
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/* Mark every \c as "quoted c" */
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for (i = j = 0; matchBuf[i]; i++, j++) {
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if (matchBuf[i] == '\\') {
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collapse_pos(j, j + 1);
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remove_chunk(j, j + 1);
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int_buf[j] |= QUOT;
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i++;
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}
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}
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/* Quote-mark "chars" and 'chars' */
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/* Quote-mark "chars" and 'chars', drop delimiters */
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{
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int in_quote = 0;
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for (i = 0; int_buf[i]; i++) {
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i = 0;
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while (int_buf[i]) {
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int cur = int_buf[i];
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if (!cur)
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break;
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if (cur == '\'' || cur == '"') {
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if (!in_quote)
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in_quote = cur;
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else if (cur == in_quote)
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in_quote = 0;
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else
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int_buf[i] |= QUOT;
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} else if (in_quote && cur != '$') {
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int_buf[i] |= QUOT;
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if (!in_quote || (cur == in_quote)) {
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in_quote ^= cur;
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remove_chunk(i, i + 1);
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continue;
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}
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}
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if (in_quote)
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int_buf[i] = cur | QUOT;
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i++;
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}
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}
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@ -898,53 +894,39 @@ static NOINLINE int build_match_prefix(char *matchBuf)
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} else if (cur == '|' && prev == '>') {
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continue;
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}
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collapse_pos(0, i + 1 + (cur == int_buf[i + 1]));
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remove_chunk(0, i + 1 + (cur == int_buf[i + 1]));
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i = -1; /* back to square 1 */
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}
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}
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/* Remove all `cmd` */
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//BUG: `cmd` should count as a word: `cmd` c<tab> should search for files c*, not commands c*
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for (i = 0; int_buf[i]; i++) {
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if (int_buf[i] == '`') {
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for (j = i + 1; int_buf[j]; j++) {
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if (int_buf[j] == '`') {
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collapse_pos(i, j + 1);
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/* `cmd` should count as a word:
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* `cmd` c<tab> should search for files c*,
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* not commands c*. Therefore we don't drop
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* `cmd` entirely, we replace it with single `.
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*/
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remove_chunk(i, j);
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goto next;
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}
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}
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/* No closing ` - command mode, remove all up to ` */
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collapse_pos(0, i + 1);
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remove_chunk(0, i + 1);
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break;
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next:
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i--; /* hack increment */
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next: ;
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}
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}
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/* Remove (command...(command...)...) and {command...{command...}...} */
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{
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int paren_lvl = 0;
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int curly_lvl = 0;
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for (i = 0; int_buf[i]; i++) {
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if (int_buf[i] == '(' || int_buf[i] == '{') {
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if (int_buf[i] == '(')
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paren_lvl++;
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else
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curly_lvl++;
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collapse_pos(0, i + 1);
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i = -1; /* hack increment */
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}
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}
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for (i = 0; pos_buf[i] >= 0 && (paren_lvl > 0 || curly_lvl > 0); i++) {
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if ((int_buf[i] == ')' && paren_lvl > 0)
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|| (int_buf[i] == '}' && curly_lvl > 0)
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) {
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if (int_buf[i] == ')')
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paren_lvl--;
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else
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curly_lvl--;
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collapse_pos(0, i + 1);
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i = -1; /* hack increment */
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}
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/* Remove "cmd (" and "cmd {"
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* Example: "if { c<tab>"
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* In this example, c should be matched as command pfx.
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*/
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for (i = 0; int_buf[i]; i++) {
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if (int_buf[i] == '(' || int_buf[i] == '{') {
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remove_chunk(0, i + 1);
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i = -1; /* hack increment */
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}
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}
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@ -952,7 +934,7 @@ static NOINLINE int build_match_prefix(char *matchBuf)
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for (i = 0; int_buf[i]; i++)
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if (int_buf[i] != ' ')
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break;
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collapse_pos(0, i);
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remove_chunk(0, i);
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/* Determine completion mode */
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command_mode = FIND_EXE_ONLY;
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@ -960,9 +942,9 @@ static NOINLINE int build_match_prefix(char *matchBuf)
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if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
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if (int_buf[i] == ' '
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&& command_mode == FIND_EXE_ONLY
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&& matchBuf[pos_buf[0]] == 'c'
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&& matchBuf[pos_buf[1]] == 'd'
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//BUG: must check "cd ", not "cd"
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&& (char)int_buf[0] == 'c'
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&& (char)int_buf[1] == 'd'
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&& i == 2 /* -> int_buf[2] == ' ' */
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) {
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command_mode = FIND_DIR_ONLY;
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} else {
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@ -979,36 +961,20 @@ static NOINLINE int build_match_prefix(char *matchBuf)
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for (--i; i >= 0; i--) {
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int cur = int_buf[i];
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if (cur == ' ' || cur == '<' || cur == '>' || cur == '|' || cur == '&') {
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collapse_pos(0, i + 1);
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remove_chunk(0, i + 1);
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break;
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}
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}
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/* Skip all leading unquoted ' or " */
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//BUG: bash doesn't do this
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for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++)
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continue;
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/* Skip quoted or unquoted // or /~ */
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//BUG: bash doesn't do this
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while ((char)int_buf[i] == '/'
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&& ((char)int_buf[i+1] == '/' || (char)int_buf[i+1] == '~')
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) {
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i++;
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}
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/* set only match and destroy quotes */
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{
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int pos = 0;
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for (j = 0; pos_buf[i] >= 0; i++) {
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matchBuf[j++] = matchBuf[pos_buf[i]];
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pos = pos_buf[i] + 1;
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}
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matchBuf[j] = '\0';
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}
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/* Store only match prefix */
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i = 0;
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while ((matchBuf[i] = int_buf[i]) != '\0')
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i++;
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if (dbg_bmp) printf("final matchBuf:'%s'\n", matchBuf);
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return command_mode;
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}
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#undef int_buf
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#undef pos_buf
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/*
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* Display by column (original idea from ls applet,
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