mirror of
https://github.com/sheumann/hush.git
synced 2024-06-01 00:41:33 +00:00
lineedit: stop using both data/bss and tons of stack.
stack usage was ~10 kb! unfortunately, noticeable code size growth: text data bss dec hex filename 9252 12 181 9445 24e5 busybox.t7/libbb/lineedit.o 9714 4 0 9718 25f6 busybox.t8/libbb/lineedit.o
This commit is contained in:
Denis Vlasenko
parent
e7fca5125a
commit
73cb1fdfea
259
libbb/lineedit.c
259
libbb/lineedit.c
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@ -41,7 +41,6 @@
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#define ENABLE_FEATURE_TAB_COMPLETION 0
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#define ENABLE_FEATURE_USERNAME_COMPLETION 0
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#define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
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#define ENABLE_FEATURE_CLEAN_UP 0
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#endif /* TEST */
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@ -56,36 +55,118 @@
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#endif
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#define ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR \
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(ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
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(ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
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#define USE_FEATURE_GETUSERNAME_AND_HOMEDIR(...)
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#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
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#undef USE_FEATURE_GETUSERNAME_AND_HOMEDIR
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#define USE_FEATURE_GETUSERNAME_AND_HOMEDIR(...) __VA_ARGS__
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#endif
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enum { MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN };
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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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};
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static line_input_t *state;
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#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
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static const char null_str[] ALIGN1 = "";
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#endif
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static struct termios initial_settings, new_settings;
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/* We try to minimize both static and stack usage. */
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struct statics {
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line_input_t *state;
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static volatile unsigned cmdedit_termw = 80; /* actual terminal width */
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volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
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sighandler_t previous_SIGWINCH_handler;
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static int cmdedit_x; /* real x terminal position */
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static int cmdedit_y; /* pseudoreal y terminal position */
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static int cmdedit_prmt_len; /* length of prompt (without colors etc) */
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static unsigned cursor;
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static unsigned command_len;
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static char *command_ps;
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static const char *cmdedit_prompt;
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int cmdedit_x; /* real x terminal position */
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int cmdedit_y; /* pseudoreal y terminal position */
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int cmdedit_prmt_len; /* length of prompt (without colors etc) */
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unsigned cursor;
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unsigned command_len;
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char *command_ps;
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const char *cmdedit_prompt;
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#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
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static char *hostname_buf;
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static int num_ok_lines = 1;
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char *hostname_buf;
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int num_ok_lines; /* = 1; */
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#endif
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#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
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static const char null_str[] = "";
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static char *user_buf;
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static char *home_pwd_buf = (char*)null_str;
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char *user_buf;
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char *home_pwd_buf; /* = (char*)null_str; */
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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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#endif
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#if ENABLE_FEATURE_EDITING_VI
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#define DELBUFSIZ 128
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char *delptr;
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smallint newdelflag; /* whether delbuf should be reused yet */
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char delbuf[DELBUFSIZ]; /* a place to store deleted characters */
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#endif
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/* Formerly these were big buffers on stack: */
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#if ENABLE_FEATURE_TAB_COMPLETION
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char exe_n_cwd_tab_completion__dirbuf[MAX_LINELEN];
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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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static struct statics *const ptr_to_statics __attribute__ ((section (".data")));
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#define S (*ptr_to_statics)
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#define state (S.state )
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#define cmdedit_termw (S.cmdedit_termw )
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#define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
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#define cmdedit_x (S.cmdedit_x )
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#define cmdedit_y (S.cmdedit_y )
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#define cmdedit_prmt_len (S.cmdedit_prmt_len)
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#define cursor (S.cursor )
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#define command_len (S.command_len )
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#define command_ps (S.command_ps )
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#define cmdedit_prompt (S.cmdedit_prompt )
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#define hostname_buf (S.hostname_buf )
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#define num_ok_lines (S.num_ok_lines )
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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 num_matches (S.num_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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#define INIT_S() do { \
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(*(struct statics**)&ptr_to_statics) = xzalloc(sizeof(S)); \
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cmdedit_termw = 80; \
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USE_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
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USE_FEATURE_GETUSERNAME_AND_HOMEDIR(home_pwd_buf = (char*)null_str;) \
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} while (0)
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static void deinit_S(void)
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{
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#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
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free(hostname_buf);
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/* This one is allocated only if FANCY_PROMPT is on
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* (otherwise it points to verbatim prompt (NOT malloced) */
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free((char*)cmdedit_prompt);
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#endif
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#if ENABLE_FEATURE_GETUSERNAME_AND_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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#endif
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free(ptr_to_statics);
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}
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#define DEINIT_S() deinit_S()
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/* Put 'command_ps[cursor]', cursor++.
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* Advance cursor on screen. If we reached right margin, scroll text up
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* and remove terminal margin effect by printing 'next_char' */
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@ -110,8 +191,7 @@ static void cmdedit_set_out_char(int next_char)
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} else
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#endif
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{
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if (initial_settings.c_lflag & ECHO)
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bb_putchar(c);
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bb_putchar(c);
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}
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if (++cmdedit_x >= cmdedit_termw) {
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/* terminal is scrolled down */
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@ -204,13 +284,6 @@ static void redraw(int y, int back_cursor)
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input_backward(back_cursor);
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}
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#if ENABLE_FEATURE_EDITING_VI
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#define DELBUFSIZ 128
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static char *delbuf; /* a (malloced) place to store deleted characters */
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static char *delp;
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static char newdelflag; /* whether delbuf should be reused yet */
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#endif
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/* Delete the char in front of the cursor, optionally saving it
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* for later putback */
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static void input_delete(int save)
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@ -223,14 +296,11 @@ static void input_delete(int save)
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#if ENABLE_FEATURE_EDITING_VI
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if (save) {
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if (newdelflag) {
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if (!delbuf)
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delbuf = malloc(DELBUFSIZ);
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/* safe if malloc fails */
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delp = delbuf;
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delptr = delbuf;
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newdelflag = 0;
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}
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if (delbuf && (delp - delbuf < DELBUFSIZ))
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*delp++ = command_ps[j];
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if ((delptr - delbuf) < DELBUFSIZ)
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*delptr++ = command_ps[j];
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}
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#endif
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@ -245,7 +315,7 @@ static void input_delete(int save)
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static void put(void)
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{
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int ocursor;
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int j = delp - delbuf;
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int j = delptr - delbuf;
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if (j == 0)
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return;
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@ -275,12 +345,8 @@ static void input_forward(void)
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cmdedit_set_out_char(command_ps[cursor + 1]);
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}
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#if ENABLE_FEATURE_TAB_COMPLETION
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static char **matches;
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static unsigned num_matches;
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static void free_tab_completion_data(void)
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{
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if (matches) {
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@ -329,11 +395,8 @@ static void username_tab_completion(char *ud, char *with_shash_flg)
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}
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if (home) {
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if ((userlen + strlen(home) + 1) < MAX_LINELEN) {
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char temp2[MAX_LINELEN]; /* argument size */
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/* /home/user/... */
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sprintf(temp2, "%s%s", home, ud);
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strcpy(sav_ud, temp2);
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sprintf(sav_ud, "%s%s", home, ud);
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}
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}
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} else {
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@ -411,7 +474,6 @@ static void exe_n_cwd_tab_completion(char *command, int type)
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{
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DIR *dir;
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struct dirent *next;
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char dirbuf[MAX_LINELEN];
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struct stat st;
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char *path1[1];
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char **paths = path1;
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@ -419,6 +481,8 @@ static void exe_n_cwd_tab_completion(char *command, int type)
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int i;
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char *found;
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char *pfind = strrchr(command, '/');
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/* char dirbuf[MAX_LINELEN]; */
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#define dirbuf (S.exe_n_cwd_tab_completion__dirbuf)
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npaths = 1;
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path1[0] = (char*)".";
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@ -492,21 +556,25 @@ static void exe_n_cwd_tab_completion(char *command, int type)
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free(paths[0]); /* allocated memory only in first member */
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free(paths);
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}
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#undef dirbuf
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}
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#define QUOT (UCHAR_MAX+1)
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#define collapse_pos(is, in) { \
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memmove(int_buf+(is), int_buf+(in), (MAX_LINELEN+1-(is)-(in))*sizeof(int)); \
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memmove(pos_buf+(is), pos_buf+(in), (MAX_LINELEN+1-(is)-(in))*sizeof(int)); }
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#define collapse_pos(is, in) do { \
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memmove(int_buf+(is), int_buf+(in), (MAX_LINELEN+1-(is)-(in)) * sizeof(pos_buf[0])); \
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memmove(pos_buf+(is), pos_buf+(in), (MAX_LINELEN+1-(is)-(in)) * sizeof(pos_buf[0])); \
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} while (0)
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static int find_match(char *matchBuf, int *len_with_quotes)
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{
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int i, j;
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int command_mode;
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int c, c2;
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int int_buf[MAX_LINELEN + 1];
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int pos_buf[MAX_LINELEN + 1];
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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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#define int_buf (S.find_match__int_buf)
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#define pos_buf (S.find_match__pos_buf)
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/* set to integer dimension characters and own positions */
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for (i = 0;; i++) {
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@ -622,8 +690,8 @@ static int find_match(char *matchBuf, int *len_with_quotes)
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for (i = 0; int_buf[i]; i++)
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if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
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if (int_buf[i] == ' ' && 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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&& matchBuf[pos_buf[0]] == 'c'
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&& matchBuf[pos_buf[1]] == 'd'
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) {
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command_mode = FIND_DIR_ONLY;
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} else {
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@ -657,11 +725,13 @@ static int find_match(char *matchBuf, int *len_with_quotes)
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matchBuf[c++] = matchBuf[pos_buf[i]];
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j = pos_buf[i] + 1;
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}
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matchBuf[c] = 0;
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matchBuf[c] = '\0';
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/* old length matchBuf with quotes symbols */
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*len_with_quotes = j ? j - pos_buf[0] : 0;
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return command_mode;
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#undef int_buf
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#undef pos_buf
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}
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/*
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@ -724,7 +794,7 @@ static int match_compare(const void *a, const void *b)
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}
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/* Do TAB completion */
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static void input_tab(int *lastWasTab)
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static void input_tab(smallint *lastWasTab)
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{
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if (!(state->flags & TAB_COMPLETION))
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return;
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@ -732,7 +802,8 @@ static void input_tab(int *lastWasTab)
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if (!*lastWasTab) {
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char *tmp, *tmp1;
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int len_found;
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char matchBuf[MAX_LINELEN];
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/* char matchBuf[MAX_LINELEN]; */
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#define matchBuf (S.input_tab__matchBuf)
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int find_type;
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int recalc_pos;
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@ -782,7 +853,6 @@ static void input_tab(int *lastWasTab)
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if (!matches)
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return; /* not found */
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/* find minimal match */
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// ash: yet another failure in trying to achieve "we don't die on OOM"
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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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@ -811,7 +881,7 @@ static void input_tab(int *lastWasTab)
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/* have space to placed match? */
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if ((len_found - strlen(matchBuf) + command_len) < MAX_LINELEN) {
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/* before word for match */
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command_ps[cursor - recalc_pos] = 0;
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command_ps[cursor - recalc_pos] = '\0';
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/* save tail line */
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strcpy(matchBuf, command_ps + cursor);
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/* add match */
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@ -828,6 +898,7 @@ static void input_tab(int *lastWasTab)
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redraw(cmdedit_y, command_len - recalc_pos);
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}
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free(tmp);
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#undef matchBuf
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} else {
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/* Ok -- the last char was a TAB. Since they
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* just hit TAB again, print a list of all the
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@ -843,8 +914,6 @@ static void input_tab(int *lastWasTab)
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}
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}
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#else
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#define input_tab(a) ((void)0)
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#endif /* FEATURE_COMMAND_TAB_COMPLETION */
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@ -1079,14 +1148,14 @@ vi_back_motion(char *command)
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*/
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#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
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static void parse_prompt(const char *prmt_ptr)
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static void parse_and_put_prompt(const char *prmt_ptr)
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{
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cmdedit_prompt = prmt_ptr;
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cmdedit_prmt_len = strlen(prmt_ptr);
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put_prompt();
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}
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#else
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static void parse_prompt(const char *prmt_ptr)
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static void parse_and_put_prompt(const char *prmt_ptr)
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{
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int prmt_len = 0;
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size_t cur_prmt_len = 0;
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@ -1114,7 +1183,7 @@ static void parse_prompt(const char *prmt_ptr)
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c = bb_process_escape_sequence(&prmt_ptr);
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if (prmt_ptr == cp) {
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if (*cp == 0)
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if (*cp == '\0')
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break;
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c = *prmt_ptr++;
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switch (c) {
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@ -1147,7 +1216,7 @@ static void parse_prompt(const char *prmt_ptr)
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if (l != 0
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&& strncmp(home_pwd_buf, pbuf, l) == 0
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&& (pbuf[l]=='/' || pbuf[l]=='\0')
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&& strlen(pwd_buf+l)<PATH_MAX
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&& strlen(pwd_buf+l) < PATH_MAX
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) {
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pbuf = buf2;
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*pbuf = '~';
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@ -1188,7 +1257,7 @@ static void parse_prompt(const char *prmt_ptr)
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break;
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case '[': case ']':
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if (c == flg_not_length) {
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flg_not_length = flg_not_length == '[' ? ']' : '[';
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flg_not_length = (flg_not_length == '[' ? ']' : '[');
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continue;
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}
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break;
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@ -1210,11 +1279,6 @@ static void parse_prompt(const char *prmt_ptr)
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}
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#endif
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#define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp)
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#define getTermSettings(fd, argp) tcgetattr(fd, argp);
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static sighandler_t previous_SIGWINCH_handler;
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static void cmdedit_setwidth(unsigned w, int redraw_flg)
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{
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cmdedit_termw = w;
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@ -1261,7 +1325,9 @@ static void win_changed(int nsig)
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*/
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int read_line_input(const char *prompt, char *command, int maxsize, line_input_t *st)
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{
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int lastWasTab = FALSE;
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#if ENABLE_FEATURE_TAB_COMPLETION
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smallint lastWasTab = FALSE;
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#endif
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unsigned int ic;
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unsigned char c;
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smallint break_out = 0;
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|
|
@ -1269,14 +1335,22 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
|
|||
smallint vi_cmdmode = 0;
|
||||
smalluint prevc;
|
||||
#endif
|
||||
struct termios initial_settings;
|
||||
struct termios new_settings;
|
||||
|
||||
getTermSettings(0, (void *) &initial_settings);
|
||||
/* Happens when e.g. stty -echo was run before */
|
||||
if (!(initial_settings.c_lflag & ECHO)) {
|
||||
parse_prompt(prompt);
|
||||
INIT_S();
|
||||
|
||||
if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
|
||||
|| !(initial_settings.c_lflag & ECHO)
|
||||
) {
|
||||
/* Happens when e.g. stty -echo was run before */
|
||||
int len;
|
||||
parse_and_put_prompt(prompt);
|
||||
fflush(stdout);
|
||||
fgets(command, maxsize, stdin);
|
||||
return strlen(command);
|
||||
len = strlen(command);
|
||||
DEINIT_S();
|
||||
return len;
|
||||
}
|
||||
|
||||
// FIXME: audit & improve this
|
||||
|
|
@ -1296,7 +1370,7 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
|
|||
command_ps = command;
|
||||
command[0] = '\0';
|
||||
|
||||
memcpy(&new_settings, &initial_settings, sizeof(new_settings));
|
||||
new_settings = initial_settings;
|
||||
new_settings.c_lflag &= ~ICANON; /* unbuffered input */
|
||||
/* Turn off echoing and CTRL-C, so we can trap it */
|
||||
new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
|
||||
|
|
@ -1308,7 +1382,7 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
|
|||
#define _POSIX_VDISABLE '\0'
|
||||
#endif
|
||||
new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
|
||||
setTermSettings(0, (void *) &new_settings);
|
||||
tcsetattr(STDIN_FILENO, TCSANOW, &new_settings);
|
||||
|
||||
/* Now initialize things */
|
||||
previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
|
||||
|
|
@ -1319,11 +1393,6 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
|
|||
|
||||
entry = getpwuid(geteuid());
|
||||
if (entry) {
|
||||
/* If we enter read_line_input for the Nth time,
|
||||
* they may be already allocated! Need to free. */
|
||||
free(user_buf);
|
||||
if (home_pwd_buf != null_str)
|
||||
free(home_pwd_buf);
|
||||
user_buf = xstrdup(entry->pw_name);
|
||||
home_pwd_buf = xstrdup(entry->pw_dir);
|
||||
/* They are not freed on exit (too small to bother) */
|
||||
|
|
@ -1331,12 +1400,12 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
|
|||
}
|
||||
#endif
|
||||
/* Print out the command prompt */
|
||||
parse_prompt(prompt);
|
||||
parse_and_put_prompt(prompt);
|
||||
|
||||
while (1) {
|
||||
fflush(stdout);
|
||||
|
||||
if (safe_read(0, &c, 1) < 1) {
|
||||
if (safe_read(STDIN_FILENO, &c, 1) < 1) {
|
||||
/* if we can't read input then exit */
|
||||
goto prepare_to_die;
|
||||
}
|
||||
|
|
@ -1411,9 +1480,11 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
|
|||
input_backspace();
|
||||
break;
|
||||
|
||||
#if ENABLE_FEATURE_TAB_COMPLETION
|
||||
case '\t':
|
||||
input_tab(&lastWasTab);
|
||||
break;
|
||||
#endif
|
||||
|
||||
#if ENABLE_FEATURE_EDITING_FANCY_KEYS
|
||||
case CTRL('K'):
|
||||
|
|
@ -1526,7 +1597,7 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
|
|||
int nc, sc;
|
||||
sc = cursor;
|
||||
prevc = ic;
|
||||
if (safe_read(0, &c, 1) < 1)
|
||||
if (safe_read(STDIN_FILENO, &c, 1) < 1)
|
||||
goto prepare_to_die;
|
||||
if (c == (prevc & 0xff)) {
|
||||
/* "cc", "dd" */
|
||||
|
|
@ -1587,7 +1658,7 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
|
|||
put();
|
||||
break;
|
||||
case 'r'|vbit:
|
||||
if (safe_read(0, &c, 1) < 1)
|
||||
if (safe_read(STDIN_FILENO, &c, 1) < 1)
|
||||
goto prepare_to_die;
|
||||
if (c == 0)
|
||||
beep();
|
||||
|
|
@ -1610,19 +1681,19 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
|
|||
}
|
||||
#endif
|
||||
/* escape sequence follows */
|
||||
if (safe_read(0, &c, 1) < 1)
|
||||
if (safe_read(STDIN_FILENO, &c, 1) < 1)
|
||||
goto prepare_to_die;
|
||||
/* different vt100 emulations */
|
||||
if (c == '[' || c == 'O') {
|
||||
vi_case('['|vbit:)
|
||||
vi_case('O'|vbit:)
|
||||
if (safe_read(0, &c, 1) < 1)
|
||||
if (safe_read(STDIN_FILENO, &c, 1) < 1)
|
||||
goto prepare_to_die;
|
||||
}
|
||||
if (c >= '1' && c <= '9') {
|
||||
unsigned char dummy;
|
||||
|
||||
if (safe_read(0, &dummy, 1) < 1)
|
||||
if (safe_read(STDIN_FILENO, &dummy, 1) < 1)
|
||||
goto prepare_to_die;
|
||||
if (dummy != '~')
|
||||
c = '\0';
|
||||
|
|
@ -1687,7 +1758,7 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
|
|||
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
|
||||
/* Control-V -- Add non-printable symbol */
|
||||
if (c == CTRL('V')) {
|
||||
if (safe_read(0, &c, 1) < 1)
|
||||
if (safe_read(STDIN_FILENO, &c, 1) < 1)
|
||||
goto prepare_to_die;
|
||||
if (c == 0) {
|
||||
beep();
|
||||
|
|
@ -1727,8 +1798,10 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
|
|||
if (break_out) /* Enter is the command terminator, no more input. */
|
||||
break;
|
||||
|
||||
#if ENABLE_FEATURE_TAB_COMPLETION
|
||||
if (c != '\t')
|
||||
lastWasTab = FALSE;
|
||||
#endif
|
||||
}
|
||||
|
||||
if (command_len > 0)
|
||||
|
|
@ -1739,18 +1812,18 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
|
|||
command[command_len] = '\0';
|
||||
}
|
||||
|
||||
#if ENABLE_FEATURE_CLEAN_UP && ENABLE_FEATURE_TAB_COMPLETION
|
||||
#if ENABLE_FEATURE_TAB_COMPLETION
|
||||
free_tab_completion_data();
|
||||
#endif
|
||||
|
||||
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
|
||||
free((char*)cmdedit_prompt);
|
||||
#endif
|
||||
/* restore initial_settings */
|
||||
setTermSettings(STDIN_FILENO, (void *) &initial_settings);
|
||||
tcsetattr(STDIN_FILENO, TCSANOW, &initial_settings);
|
||||
/* restore SIGWINCH handler */
|
||||
signal(SIGWINCH, previous_SIGWINCH_handler);
|
||||
fflush(stdout);
|
||||
|
||||
DEINIT_S();
|
||||
|
||||
return command_len;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user