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https://github.com/topjohnwu/ndk-busybox.git
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lineedit: return prefix len from tab completion helpers
This kills horrific logic which deletes and re-adds prefix (!) function old new delta complete_cmd_dir_file 705 731 +26 complete_username 121 124 +3 input_tab 1041 1016 -25 build_match_prefix 838 804 -34 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/2 up/down: 29/-59) Total: -30 bytes Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Denys Vlasenko
parent
2679e3c8cc
commit
3c460b005c
@ -638,14 +638,16 @@ static char *username_path_completion(char *ud)
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return tilde_name;
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}
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/* ~use<tab> - find all users with this prefix */
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static NOINLINE void complete_username(const char *ud)
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/* ~use<tab> - find all users with this prefix.
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* Return the length of the prefix used for matching.
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*/
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static NOINLINE unsigned complete_username(const char *ud)
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{
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/* Using _r function to avoid pulling in static buffers */
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char line_buff[256];
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struct passwd pwd;
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struct passwd *result;
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int userlen;
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unsigned userlen;
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ud++; /* skip ~ */
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userlen = strlen(ud);
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@ -658,6 +660,8 @@ static NOINLINE void complete_username(const char *ud)
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}
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}
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endpwent();
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return 1 + userlen;
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}
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#endif /* FEATURE_USERNAME_COMPLETION */
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@ -710,14 +714,17 @@ static int path_parse(char ***p)
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return npth;
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}
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static NOINLINE void complete_cmd_dir_file(char *command, int type)
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/* Complete command, directory or file name.
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* Return the length of the prefix used for matching.
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*/
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static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
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{
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char *path1[1];
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char **paths = path1;
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int npaths;
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int i;
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unsigned pf_len;
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char *pfind;
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const char *pfind;
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char *dirbuf = NULL;
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npaths = 1;
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@ -797,8 +804,12 @@ static NOINLINE void complete_cmd_dir_file(char *command, int type)
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if (paths != path1) {
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free(paths[0]); /* allocated memory is only in first member */
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free(paths);
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} else if (dirbuf) {
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pf_len += strlen(dirbuf);
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free(dirbuf);
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}
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free(dirbuf);
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return pf_len;
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}
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/* build_match_prefix:
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@ -829,7 +840,7 @@ static void collapse_pos(int beg, int end)
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bb_putchar('\n');
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}
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}
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static NOINLINE int build_match_prefix(char *matchBuf, int *len_with_quotes)
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static NOINLINE int build_match_prefix(char *matchBuf)
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{
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int i, j;
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int command_mode;
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@ -992,9 +1003,6 @@ static NOINLINE int build_match_prefix(char *matchBuf, int *len_with_quotes)
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pos = pos_buf[i] + 1;
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}
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matchBuf[j] = '\0';
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/* old length matchBuf with quotes symbols */
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*len_with_quotes = pos ? pos - pos_buf[0] : 0;
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if (dbg_bmp) printf("len_with_quotes:%d\n", *len_with_quotes);
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}
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return command_mode;
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@ -1067,12 +1075,13 @@ static NOINLINE void input_tab(smallint *lastWasTab)
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return;
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if (!*lastWasTab) {
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char *tmp, *tmp1;
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char *tmp;
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size_t len_found;
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/* char matchBuf[MAX_LINELEN]; */
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#define matchBuf (S.input_tab__matchBuf)
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/* Length of string used for matching */
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unsigned match_pfx_len = match_pfx_len;
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int find_type;
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int recalc_pos;
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#if ENABLE_UNICODE_SUPPORT
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/* cursor pos in command converted to multibyte form */
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int cursor_mb;
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@ -1095,7 +1104,7 @@ static NOINLINE void input_tab(smallint *lastWasTab)
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#endif
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tmp = matchBuf;
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find_type = build_match_prefix(matchBuf, &recalc_pos);
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find_type = build_match_prefix(matchBuf);
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/* Free up any memory already allocated */
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free_tab_completion_data();
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@ -1105,11 +1114,11 @@ static NOINLINE void input_tab(smallint *lastWasTab)
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* then try completing this word as a username. */
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if (state->flags & USERNAME_COMPLETION)
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if (matchBuf[0] == '~' && strchr(matchBuf, '/') == NULL)
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complete_username(matchBuf);
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match_pfx_len = complete_username(matchBuf);
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#endif
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/* Try to match a command in $PATH, or a directory, or a file */
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if (!matches)
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complete_cmd_dir_file(matchBuf, find_type);
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match_pfx_len = complete_cmd_dir_file(matchBuf, find_type);
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/* Remove duplicates */
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if (matches) {
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unsigned i;
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@ -1130,23 +1139,26 @@ static NOINLINE void input_tab(smallint *lastWasTab)
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}
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/* Did we find exactly one match? */
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if (num_matches != 1) { /* no */
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char *tmp1;
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beep();
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if (!matches)
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return; /* no matches at all */
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/* Find common prefix */
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tmp1 = xstrdup(matches[0]);
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for (tmp = tmp1; *tmp; tmp++) {
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for (len_found = 1; len_found < num_matches; len_found++) {
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if (matches[len_found][tmp - tmp1] != *tmp) {
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*tmp = '\0';
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break;
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unsigned n;
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for (n = 1; n < num_matches; n++) {
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if (matches[n][tmp - tmp1] != *tmp) {
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goto stop;
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}
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}
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}
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if (*tmp1 == '\0') { /* have unique prefix? */
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stop:
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if (tmp1 == tmp) { /* have unique prefix? */
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free(tmp1); /* no */
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return;
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}
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*tmp = '\0';
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tmp = add_quote_for_spec_chars(tmp1);
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free(tmp1);
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len_found = strlen(tmp);
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@ -1163,41 +1175,43 @@ static NOINLINE void input_tab(smallint *lastWasTab)
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}
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#if !ENABLE_UNICODE_SUPPORT
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/* have space to place the match? */
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/* Have space to place the match? */
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/* The result consists of three parts with these lengths: */
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/* (cursor - recalc_pos) + len_found + (command_len - cursor) */
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/* cursor + (len_found - match_pfx_len) + (command_len - cursor) */
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/* it simplifies into: */
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if ((int)(len_found + command_len - recalc_pos) < S.maxsize) {
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if ((int)(len_found - match_pfx_len + command_len) < S.maxsize) {
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int pos;
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/* save tail */
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strcpy(matchBuf, command_ps + cursor);
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strcpy(matchBuf, &command_ps[cursor]);
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/* add match and tail */
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sprintf(&command_ps[cursor - recalc_pos], "%s%s", tmp, matchBuf);
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sprintf(&command_ps[cursor], "%s%s", tmp + match_pfx_len, matchBuf);
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command_len = strlen(command_ps);
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/* new pos */
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recalc_pos = cursor - recalc_pos + len_found;
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pos = cursor + len_found - match_pfx_len;
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/* write out the matched command */
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redraw(cmdedit_y, command_len - recalc_pos);
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redraw(cmdedit_y, command_len - pos);
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}
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#else
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{
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char command[MAX_LINELEN];
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int len = save_string(command, sizeof(command));
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/* have space to place the match? */
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/* (cursor_mb - recalc_pos) + len_found + (len - cursor_mb) */
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if ((int)(len_found + len - recalc_pos) < MAX_LINELEN) {
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/* Have space to place the match? */
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/* cursor_mb + (len_found - match_pfx_len) + (len - cursor_mb) */
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if ((int)(len_found - match_pfx_len + len) < MAX_LINELEN) {
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int pos;
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/* save tail */
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strcpy(matchBuf, command + cursor_mb);
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strcpy(matchBuf, &command[cursor_mb]);
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/* where do we want to have cursor after all? */
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strcpy(&command[cursor_mb - recalc_pos], tmp);
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strcpy(&command[cursor_mb], tmp + match_pfx_len);
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len = load_string(command, S.maxsize);
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/* add match and tail */
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sprintf(&command[cursor_mb - recalc_pos], "%s%s", tmp, matchBuf);
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sprintf(&command[cursor_mb], "%s%s", tmp + match_pfx_len, matchBuf);
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command_len = load_string(command, S.maxsize);
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/* write out the matched command */
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/* paranoia: load_string can return 0 on conv error,
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* prevent passing len = (0 - 12) to redraw */
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len = command_len - len;
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redraw(cmdedit_y, len >= 0 ? len : 0);
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* prevent passing pos = (0 - 12) to redraw */
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pos = command_len - len;
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redraw(cmdedit_y, pos >= 0 ? pos : 0);
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}
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}
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#endif
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