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shell: do not read user database for every prompt - only for those which need it
function old new delta get_user_strings - 52 +52 get_homedir_or_NULL - 23 +23 parse_and_put_prompt 823 838 +15 null_str 1 - -1 complete_cmd_dir_file 814 812 -2 deinit_S 51 42 -9 read_line_input 3059 3015 -44 ------------------------------------------------------------------------------ (add/remove: 2/1 grow/shrink: 1/3 up/down: 90/-56) Total: 34 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
6ba1f2d0bc
commit
f4fcd74a6e
@ -135,10 +135,6 @@ enum {
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: 0x7ff0
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};
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#if ENABLE_USERNAME_OR_HOMEDIR
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static const char null_str[] ALIGN1 = "";
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#endif
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/* We try to minimize both static and stack usage. */
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struct lineedit_statics {
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line_input_t *state;
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@ -161,12 +157,13 @@ struct lineedit_statics {
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#if ENABLE_USERNAME_OR_HOMEDIR
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char *user_buf;
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char *home_pwd_buf; /* = (char*)null_str; */
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char *home_pwd_buf;
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smallint got_user_strings;
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#endif
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#if ENABLE_FEATURE_TAB_COMPLETION
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char **matches;
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unsigned num_matches;
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char **matches;
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#endif
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#if ENABLE_FEATURE_EDITING_WINCH
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@ -207,8 +204,9 @@ extern struct lineedit_statics *BB_GLOBAL_CONST lineedit_ptr_to_statics;
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#define prompt_last_line (S.prompt_last_line)
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#define user_buf (S.user_buf )
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#define home_pwd_buf (S.home_pwd_buf )
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#define matches (S.matches )
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#define got_user_strings (S.got_user_strings)
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#define num_matches (S.num_matches )
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#define matches (S.matches )
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#define delptr (S.delptr )
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#define newdelflag (S.newdelflag )
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#define delbuf (S.delbuf )
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@ -226,14 +224,47 @@ static void deinit_S(void)
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#endif
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#if ENABLE_USERNAME_OR_HOMEDIR
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free(user_buf);
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if (home_pwd_buf != null_str)
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free(home_pwd_buf);
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free(home_pwd_buf);
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#endif
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free(lineedit_ptr_to_statics);
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}
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#define DEINIT_S() deinit_S()
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#if ENABLE_USERNAME_OR_HOMEDIR
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/* Call getpwuid() only if necessary.
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* E.g. if PS1=':', no user database reading is needed to generate prompt.
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* (Unfortunately, default PS1='\w \$' needs it, \w abbreviates homedir
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* as ~/... - for that it needs to *know* the homedir...)
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*/
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static void get_user_strings(void)
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{
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struct passwd *entry;
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got_user_strings = 1;
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entry = getpwuid(geteuid());
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if (entry) {
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user_buf = xstrdup(entry->pw_name);
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home_pwd_buf = xstrdup(entry->pw_dir);
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}
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}
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static const char *get_username_str(void)
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{
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if (!got_user_strings)
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get_user_strings();
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return user_buf ? user_buf : "";
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/* btw, bash uses "I have no name!" string if uid has no entry */
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}
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static NOINLINE const char *get_homedir_or_NULL(void)
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{
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if (!got_user_strings)
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get_user_strings();
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return home_pwd_buf;
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}
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#endif
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#if ENABLE_UNICODE_SUPPORT
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static size_t load_string(const char *src)
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{
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@ -691,11 +722,11 @@ static char *username_path_completion(char *ud)
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{
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struct passwd *entry;
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char *tilde_name = ud;
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char *home = NULL;
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const char *home = NULL;
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ud++; /* skip ~ */
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if (*ud == '/') { /* "~/..." */
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home = home_pwd_buf;
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home = get_homedir_or_NULL();
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} else {
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/* "~user/..." */
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ud = strchr(ud, '/');
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@ -1971,7 +2002,7 @@ static void parse_and_put_prompt(const char *prmt_ptr)
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switch (c) {
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case 'u':
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pbuf = user_buf ? user_buf : (char*)"";
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pbuf = (char*)get_username_str();
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break;
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case 'H':
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case 'h':
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@ -1993,14 +2024,15 @@ static void parse_and_put_prompt(const char *prmt_ptr)
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case 'w': /* current dir */
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case 'W': /* basename of cur dir */
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if (!cwd_buf) {
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const char *home;
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cwd_buf = xrealloc_getcwd_or_warn(NULL);
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if (!cwd_buf)
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cwd_buf = (char *)bb_msg_unknown;
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else if (home_pwd_buf[0]) {
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else if ((home = get_homedir_or_NULL()) != NULL && home[0]) {
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char *after_home_user;
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/* /home/user[/something] -> ~[/something] */
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after_home_user = is_prefixed_with(cwd_buf, home_pwd_buf);
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after_home_user = is_prefixed_with(cwd_buf, home);
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if (after_home_user
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&& (*after_home_user == '/' || *after_home_user == '\0')
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) {
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@ -2399,7 +2431,6 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
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//command_len = 0; - done by INIT_S()
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//cmdedit_y = 0; /* quasireal y, not true if line > xt*yt */
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cmdedit_termw = 80;
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IF_USERNAME_OR_HOMEDIR(home_pwd_buf = (char*)null_str;)
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IF_FEATURE_EDITING_VI(delptr = delbuf;)
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n = get_termios_and_make_raw(STDIN_FILENO, &new_settings, &initial_settings, 0
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@ -2459,18 +2490,6 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
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tcsetattr_stdin_TCSANOW(&new_settings);
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#if ENABLE_USERNAME_OR_HOMEDIR
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{
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struct passwd *entry;
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entry = getpwuid(geteuid());
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if (entry) {
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user_buf = xstrdup(entry->pw_name);
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home_pwd_buf = xstrdup(entry->pw_dir);
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}
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}
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#endif
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#if 0
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for (i = 0; i <= state->max_history; i++)
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bb_error_msg("history[%d]:'%s'", i, state->history[i]);
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