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5156b24553
busybox/libbb/lineedit.c
YU Jincheng 5156b24553 Make const ptr assign as function call in clang 
- This can act as memory barrier in clang to avoid
  read before assign of a const ptr

Signed-off-by: LoveSy <shana@zju.edu.cn>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-10-09 22:30:45 +02:00

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/* vi: set sw=4 ts=4: */
/*
* Command line editing.
*
* Copyright (c) 1986-2003 may safely be consumed by a BSD or GPL license.
* Written by: Vladimir Oleynik <dzo@simtreas.ru>
*
* Used ideas:
* Adam Rogoyski <rogoyski@cs.utexas.edu>
* Dave Cinege <dcinege@psychosis.com>
* Jakub Jelinek (c) 1995
* Erik Andersen <andersen@codepoet.org> (Majorly adjusted for busybox)
*
* This code is 'as is' with no warranty.
*/
/*
* Usage and known bugs:
* Terminal key codes are not extensive, more needs to be added.
* This version was created on Debian GNU/Linux 2.x.
* Delete, Backspace, Home, End, and the arrow keys were tested
* to work in an Xterm and console. Ctrl-A also works as Home.
* Ctrl-E also works as End.
*
* The following readline-like commands are not implemented:
* CTL-t -- Transpose two characters
*
* lineedit does not know that the terminal escape sequences do not
* take up space on the screen. The redisplay code assumes, unless
* told otherwise, that each character in the prompt is a printable
* character that takes up one character position on the screen.
* You need to tell lineedit that some sequences of characters
* in the prompt take up no screen space. Compatibly with readline,
* use the \[ escape to begin a sequence of non-printing characters,
* and the \] escape to signal the end of such a sequence. Example:
*
* PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
*
* Unicode in PS1 is not fully supported: prompt length calulation is wrong,
* resulting in line wrap problems with long (multi-line) input.
*/
#include "busybox.h"
#include "NUM_APPLETS.h"
#include "unicode.h"
#ifndef _POSIX_VDISABLE
# define _POSIX_VDISABLE '\0'
#endif
#ifdef TEST
# define ENABLE_FEATURE_EDITING 0
# define ENABLE_FEATURE_TAB_COMPLETION 0
# define ENABLE_FEATURE_USERNAME_COMPLETION 0
#endif
/* Entire file (except TESTing part) sits inside this #if */
#if ENABLE_FEATURE_EDITING
#if !ENABLE_SHELL_ASH && !ENABLE_SHELL_HUSH
/* so far only shells use these features */
# undef ENABLE_FEATURE_EDITING_FANCY_PROMPT
# undef ENABLE_FEATURE_TAB_COMPLETION
# undef ENABLE_FEATURE_USERNAME_COMPLETION
# define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
# define ENABLE_FEATURE_TAB_COMPLETION 0
# define ENABLE_FEATURE_USERNAME_COMPLETION 0
#endif
#define ENABLE_USERNAME_OR_HOMEDIR \
(ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
#if ENABLE_USERNAME_OR_HOMEDIR
# define IF_USERNAME_OR_HOMEDIR(...) __VA_ARGS__
#else
# define IF_USERNAME_OR_HOMEDIR(...) /*nothing*/
#endif
#undef CHAR_T
#if ENABLE_UNICODE_SUPPORT
# define BB_NUL ((wchar_t)0)
# define CHAR_T wchar_t
static bool BB_isspace(CHAR_T c)
{
return ((unsigned)c < 256 && isspace(c));
}
# if ENABLE_FEATURE_EDITING_VI
static bool BB_isalnum_or_underscore(CHAR_T c)
{
return ((unsigned)c < 256 && isalnum(c)) || c == '_';
}
# endif
static bool BB_ispunct(CHAR_T c)
{
return ((unsigned)c < 256 && ispunct(c));
}
# undef isspace
# undef isalnum
# undef ispunct
# undef isprint
# define isspace isspace_must_not_be_used
# define isalnum isalnum_must_not_be_used
# define ispunct ispunct_must_not_be_used
# define isprint isprint_must_not_be_used
#else
# define BB_NUL '\0'
# define CHAR_T char
# define BB_isspace(c) isspace(c)
# if ENABLE_FEATURE_EDITING_VI
static bool BB_isalnum_or_underscore(CHAR_T c)
{
return isalnum(c) || c == '_';
}
# endif
# define BB_ispunct(c) ispunct(c)
#endif
#if ENABLE_UNICODE_PRESERVE_BROKEN
# define unicode_mark_raw_byte(wc) ((wc) | 0x20000000)
# define unicode_is_raw_byte(wc) ((wc) & 0x20000000)
#else
# define unicode_is_raw_byte(wc) 0
#endif
#define ESC "\033"
#define SEQ_CLEAR_TILL_END_OF_SCREEN ESC"[J"
//#define SEQ_CLEAR_TILL_END_OF_LINE ESC"[K"
enum {
MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
? CONFIG_FEATURE_EDITING_MAX_LEN
: 0x7ff0
};
#if ENABLE_USERNAME_OR_HOMEDIR
static const char null_str[] ALIGN1 = "";
#endif
/* We try to minimize both static and stack usage. */
struct lineedit_statics {
line_input_t *state;
unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
unsigned cmdedit_x; /* real x (col) terminal position */
unsigned cmdedit_y; /* pseudoreal y (row) terminal position */
unsigned cmdedit_prmt_len; /* on-screen length of last/sole prompt line */
unsigned cursor;
int command_len; /* must be signed */
/* signed maxsize: we want x in "if (x > S.maxsize)"
* to _not_ be promoted to unsigned */
int maxsize;
CHAR_T *command_ps;
const char *cmdedit_prompt;
const char *prompt_last_line; /* last/sole prompt line */
#if ENABLE_USERNAME_OR_HOMEDIR
char *user_buf;
char *home_pwd_buf; /* = (char*)null_str; */
#endif
#if ENABLE_FEATURE_TAB_COMPLETION
char **matches;
unsigned num_matches;
#endif
#if ENABLE_FEATURE_EDITING_WINCH
unsigned SIGWINCH_saved;
volatile unsigned SIGWINCH_count;
volatile smallint ok_to_redraw;
#endif
#if ENABLE_FEATURE_EDITING_VI
# define DELBUFSIZ 128
smallint newdelflag; /* whether delbuf should be reused yet */
CHAR_T *delptr;
CHAR_T delbuf[DELBUFSIZ]; /* a place to store deleted characters */
#endif
#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
smallint sent_ESC_br6n;
#endif
#if ENABLE_FEATURE_EDITING_WINCH
/* Largish struct, keeping it last results in smaller code */
struct sigaction SIGWINCH_handler;
#endif
};
/* See lineedit_ptr_hack.c */
extern struct lineedit_statics *BB_GLOBAL_CONST lineedit_ptr_to_statics;
#define S (*lineedit_ptr_to_statics)
#define state (S.state )
#define cmdedit_termw (S.cmdedit_termw )
#define cmdedit_x (S.cmdedit_x )
#define cmdedit_y (S.cmdedit_y )
#define cmdedit_prmt_len (S.cmdedit_prmt_len)
#define cursor (S.cursor )
#define command_len (S.command_len )
#define command_ps (S.command_ps )
#define cmdedit_prompt (S.cmdedit_prompt )
#define prompt_last_line (S.prompt_last_line)
#define user_buf (S.user_buf )
#define home_pwd_buf (S.home_pwd_buf )
#define matches (S.matches )
#define num_matches (S.num_matches )
#define delptr (S.delptr )
#define newdelflag (S.newdelflag )
#define delbuf (S.delbuf )
#define INIT_S() do { \
XZALLOC_CONST_PTR(&lineedit_ptr_to_statics, sizeof(S)); \
} while (0)
static void deinit_S(void)
{
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
/* This one is allocated only if FANCY_PROMPT is on
* (otherwise it points to verbatim prompt (NOT malloced)) */
free((char*)cmdedit_prompt);
#endif
#if ENABLE_USERNAME_OR_HOMEDIR
free(user_buf);
if (home_pwd_buf != null_str)
free(home_pwd_buf);
#endif
free(lineedit_ptr_to_statics);
}
#define DEINIT_S() deinit_S()
#if ENABLE_UNICODE_SUPPORT
static size_t load_string(const char *src)
{
if (unicode_status == UNICODE_ON) {
ssize_t len = mbstowcs(command_ps, src, S.maxsize - 1);
if (len < 0)
len = 0;
command_ps[len] = BB_NUL;
return len;
} else {
unsigned i = 0;
while (src[i] && i < S.maxsize - 1) {
command_ps[i] = src[i];
i++;
}
command_ps[i] = BB_NUL;
return i;
}
}
static unsigned save_string(char *dst, unsigned maxsize)
{
if (unicode_status == UNICODE_ON) {
# if !ENABLE_UNICODE_PRESERVE_BROKEN
ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
if (len < 0)
len = 0;
dst[len] = '\0';
return len;
# else
unsigned dstpos = 0;
unsigned srcpos = 0;
maxsize--;
while (dstpos < maxsize) {
wchar_t wc;
int n = srcpos;
/* Convert up to 1st invalid byte (or up to end) */
while ((wc = command_ps[srcpos]) != BB_NUL
&& !unicode_is_raw_byte(wc)
) {
srcpos++;
}
command_ps[srcpos] = BB_NUL;
n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
if (n < 0) /* should not happen */
break;
dstpos += n;
if (wc == BB_NUL) /* usually is */
break;
/* We do have invalid byte here! */
command_ps[srcpos] = wc; /* restore it */
srcpos++;
if (dstpos == maxsize)
break;
dst[dstpos++] = (char) wc;
}
dst[dstpos] = '\0';
return dstpos;
# endif
} else {
unsigned i = 0;
while ((dst[i] = command_ps[i]) != 0)
i++;
return i;
}
}
/* I thought just fputwc(c, stdout) would work. But no... */
static void BB_PUTCHAR(wchar_t c)
{
if (unicode_status == UNICODE_ON) {
char buf[MB_CUR_MAX + 1];
mbstate_t mbst = { 0 };
ssize_t len = wcrtomb(buf, c, &mbst);
if (len > 0) {
buf[len] = '\0';
fputs_stdout(buf);
}
} else {
/* In this case, c is always one byte */
putchar(c);
}
}
# if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
static wchar_t adjust_width_and_validate_wc(unsigned *width_adj, wchar_t wc)
# else
static wchar_t adjust_width_and_validate_wc(wchar_t wc)
# define adjust_width_and_validate_wc(width_adj, wc) \
((*(width_adj))++, adjust_width_and_validate_wc(wc))
# endif
{
int w = 1;
if (unicode_status == UNICODE_ON) {
if (wc > CONFIG_LAST_SUPPORTED_WCHAR) {
/* note: also true for unicode_is_raw_byte(wc) */
goto subst;
}
w = wcwidth(wc);
if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0)
|| (!ENABLE_UNICODE_COMBINING_WCHARS && w <= 0)
|| (!ENABLE_UNICODE_WIDE_WCHARS && w > 1)
) {
subst:
w = 1;
wc = CONFIG_SUBST_WCHAR;
}
}
# if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
*width_adj += w;
#endif
return wc;
}
#else /* !UNICODE */
static size_t load_string(const char *src)
{
safe_strncpy(command_ps, src, S.maxsize);
return strlen(command_ps);
}
# if ENABLE_FEATURE_TAB_COMPLETION
static void save_string(char *dst, unsigned maxsize)
{
safe_strncpy(dst, command_ps, maxsize);
}
# endif
# define BB_PUTCHAR(c) bb_putchar(c)
/* Should never be called: */
int adjust_width_and_validate_wc(unsigned *width_adj, int wc);
#endif
/* Put 'command_ps[cursor]', cursor++.
* Advance cursor on screen. If we reached right margin, scroll text up
* and remove terminal margin effect by printing 'next_char' */
#define HACK_FOR_WRONG_WIDTH 1
static void put_cur_glyph_and_inc_cursor(void)
{
CHAR_T c = command_ps[cursor];
unsigned width = 0;
int ofs_to_right;
if (c == BB_NUL) {
/* erase character after end of input string */
c = ' ';
} else {
/* advance cursor only if we aren't at the end yet */
cursor++;
if (unicode_status == UNICODE_ON) {
IF_UNICODE_WIDE_WCHARS(width = cmdedit_x;)
c = adjust_width_and_validate_wc(&cmdedit_x, c);
IF_UNICODE_WIDE_WCHARS(width = cmdedit_x - width;)
} else {
cmdedit_x++;
}
}
ofs_to_right = cmdedit_x - cmdedit_termw;
if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right <= 0) {
/* c fits on this line */
BB_PUTCHAR(c);
}
if (ofs_to_right >= 0) {
/* we go to the next line */
#if HACK_FOR_WRONG_WIDTH
/* This works better if our idea of term width is wrong
* and it is actually wider (often happens on serial lines).
* Printing CR,LF *forces* cursor to next line.
* OTOH if terminal width is correct AND terminal does NOT
* have automargin (IOW: it is moving cursor to next line
* by itself (which is wrong for VT-10x terminals)),
* this will break things: there will be one extra empty line */
puts("\r"); /* + implicit '\n' */
#else
/* VT-10x terminals don't wrap cursor to next line when last char
* on the line is printed - cursor stays "over" this char.
* Need to print _next_ char too (first one to appear on next line)
* to make cursor move down to next line.
*/
/* Works ok only if cmdedit_termw is correct. */
c = command_ps[cursor];
if (c == BB_NUL)
c = ' ';
BB_PUTCHAR(c);
bb_putchar('\b');
#endif
cmdedit_y++;
if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right == 0) {
width = 0;
} else { /* ofs_to_right > 0 */
/* wide char c didn't fit on prev line */
BB_PUTCHAR(c);
}
cmdedit_x = width;
}
}
/* Move to end of line (by printing all chars till the end) */
static void put_till_end_and_adv_cursor(void)
{
while (cursor < command_len)
put_cur_glyph_and_inc_cursor();
}
/* Go to the next line */
static void goto_new_line(void)
{
put_till_end_and_adv_cursor();
/* "cursor == 0" is only if prompt is "" and user input is empty */
if (cursor == 0 || cmdedit_x != 0)
bb_putchar('\n');
}
static void beep(void)
{
bb_putchar('\007');
}
/* Full or last/sole prompt line, reset edit cursor, calculate terminal cursor.
* cmdedit_y is always calculated for the last/sole prompt line.
*/
static void put_prompt_custom(bool is_full)
{
fputs_stdout((is_full ? cmdedit_prompt : prompt_last_line));
cursor = 0;
cmdedit_y = cmdedit_prmt_len / cmdedit_termw; /* new quasireal y */
cmdedit_x = cmdedit_prmt_len % cmdedit_termw;
}
#define put_prompt_last_line() put_prompt_custom(0)
#define put_prompt() put_prompt_custom(1)
/* Move back one character */
/* (optimized for slow terminals) */
static void input_backward(unsigned num)
{
if (num > cursor)
num = cursor;
if (num == 0)
return;
cursor -= num;
if ((ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS)
&& unicode_status == UNICODE_ON
) {
/* correct NUM to be equal to _screen_ width */
int n = num;
num = 0;
while (--n >= 0)
adjust_width_and_validate_wc(&num, command_ps[cursor + n]);
if (num == 0)
return;
}
if (cmdedit_x >= num) {
cmdedit_x -= num;
if (num <= 4) {
/* This is longer by 5 bytes on x86.
* Also gets miscompiled for ARM users
* (busybox.net/bugs/view.php?id=2274).
* printf(("\b\b\b\b" + 4) - num);
* return;
*/
do {
bb_putchar('\b');
} while (--num);
return;
}
printf(ESC"[%uD", num);
return;
}
/* Need to go one or more lines up */
if (ENABLE_UNICODE_WIDE_WCHARS) {
/* With wide chars, it is hard to "backtrack"
* and reliably figure out where to put cursor.
* Example (<> is a wide char; # is an ordinary char, _ cursor):
* |prompt: <><> |
* |<><><><><><> |
* |_ |
* and user presses left arrow. num = 1, cmdedit_x = 0,
* We need to go up one line, and then - how do we know that
* we need to go *10* positions to the right? Because
* |prompt: <>#<>|
* |<><><>#<><><>|
* |_ |
* in this situation we need to go *11* positions to the right.
*
* A simpler thing to do is to redraw everything from the start
* up to new cursor position (which is already known):
*/
unsigned sv_cursor;
/* go to 1st column; go up to first line */
printf("\r" ESC"[%uA", cmdedit_y);
cmdedit_y = 0;
sv_cursor = cursor;
put_prompt_last_line(); /* sets cursor to 0 */
while (cursor < sv_cursor)
put_cur_glyph_and_inc_cursor();
} else {
int lines_up;
/* num = chars to go back from the beginning of current line: */
num -= cmdedit_x;
/* num=1...w: one line up, w+1...2w: two, etc: */
lines_up = 1 + (num - 1) / cmdedit_termw;
cmdedit_x = (cmdedit_termw * cmdedit_y - num) % cmdedit_termw;
cmdedit_y -= lines_up;
/* go to 1st column; go up */
printf("\r" ESC"[%uA", lines_up);
/* go to correct column.
* xterm, konsole, Linux VT interpret 0 as 1 below! wow.
* need to *make sure* we skip it if cmdedit_x == 0 */
if (cmdedit_x)
printf(ESC"[%uC", cmdedit_x);
}
}
/* See redraw and draw_full below */
static void draw_custom(int y, int back_cursor, bool is_full)
{
if (y > 0) /* up y lines */
printf(ESC"[%uA", y);
bb_putchar('\r');
put_prompt_custom(is_full);
put_till_end_and_adv_cursor();
printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
input_backward(back_cursor);
}
/* Move y lines up, draw last/sole prompt line, editor line[s], and clear tail.
* goal: redraw the prompt+input+cursor in-place, overwriting the previous */
#define redraw(y, back_cursor) draw_custom((y), (back_cursor), 0)
/* Like above, but without moving up, and while using all the prompt lines.
* goal: draw a full prompt+input+cursor unrelated to a previous position.
* note: cmdedit_y always ends up relating to the last/sole prompt line */
#define draw_full(back_cursor) draw_custom(0, (back_cursor), 1)
/* Delete the char in front of the cursor, optionally saving it
* for later putback */
#if !ENABLE_FEATURE_EDITING_VI
static void input_delete(void)
#define input_delete(save) input_delete()
#else
static void input_delete(int save)
#endif
{
int j = cursor;
if (j == (int)command_len)
return;
#if ENABLE_FEATURE_EDITING_VI
if (save) {
if (newdelflag) {
delptr = delbuf;
newdelflag = 0;
}
if ((delptr - delbuf) < DELBUFSIZ)
*delptr++ = command_ps[j];
}
#endif
memmove(command_ps + j, command_ps + j + 1,
/* (command_len + 1 [because of NUL]) - (j + 1)
* simplified into (command_len - j) */
(command_len - j) * sizeof(command_ps[0]));
command_len--;
put_till_end_and_adv_cursor();
/* Last char is still visible, erase it (and more) */
printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
input_backward(cursor - j); /* back to old pos cursor */
}
#if ENABLE_FEATURE_EDITING_VI
static void put(void)
{
int ocursor;
int j = delptr - delbuf;
if (j == 0)
return;
ocursor = cursor;
/* open hole and then fill it */
memmove(command_ps + cursor + j, command_ps + cursor,
(command_len - cursor + 1) * sizeof(command_ps[0]));
memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
command_len += j;
put_till_end_and_adv_cursor();
input_backward(cursor - ocursor - j + 1); /* at end of new text */
}
#endif
/* Delete the char in back of the cursor */
static void input_backspace(void)
{
if (cursor > 0) {
input_backward(1);
input_delete(0);
}
}
/* Move forward one character */
static void input_forward(void)
{
if (cursor < command_len)
put_cur_glyph_and_inc_cursor();
}
#if ENABLE_FEATURE_TAB_COMPLETION
//FIXME:
//needs to be more clever: currently it thinks that "foo\ b<TAB>
//matches the file named "foo bar", which is untrue.
//Also, perhaps "foo b<TAB> needs to complete to "foo bar" <cursor>,
//not "foo bar <cursor>...
static void free_tab_completion_data(void)
{
if (matches) {
while (num_matches)
free(matches[--num_matches]);
free(matches);
matches = NULL;
}
}
static void add_match(char *matched)
{
unsigned char *p = (unsigned char*)matched;
while (*p) {
/* ESC attack fix: drop any string with control chars */
if (*p < ' '
|| (!ENABLE_UNICODE_SUPPORT && *p >= 0x7f)
|| (ENABLE_UNICODE_SUPPORT && *p == 0x7f)
) {
free(matched);
return;
}
p++;
}
matches = xrealloc_vector(matches, 4, num_matches);
matches[num_matches] = matched;
num_matches++;
}
# if ENABLE_FEATURE_USERNAME_COMPLETION
/* Replace "~user/..." with "/homedir/...".
* The parameter is malloced, free it or return it
* unchanged if no user is matched.
*/
static char *username_path_completion(char *ud)
{
struct passwd *entry;
char *tilde_name = ud;
char *home = NULL;
ud++; /* skip ~ */
if (*ud == '/') { /* "~/..." */
home = home_pwd_buf;
} else {
/* "~user/..." */
ud = strchr(ud, '/');
*ud = '\0'; /* "~user" */
entry = getpwnam(tilde_name + 1);
*ud = '/'; /* restore "~user/..." */
if (entry)
home = entry->pw_dir;
}
if (home) {
ud = concat_path_file(home, ud);
free(tilde_name);
tilde_name = ud;
}
return tilde_name;
}
/* ~use<tab> - find all users with this prefix.
* Return the length of the prefix used for matching.
*/
static NOINLINE unsigned complete_username(const char *ud)
{
struct passwd *pw;
unsigned userlen;
ud++; /* skip ~ */
userlen = strlen(ud);
setpwent();
while ((pw = getpwent()) != NULL) {
/* Null usernames should result in all users as possible completions. */
if (/* !ud[0] || */ is_prefixed_with(pw->pw_name, ud)) {
add_match(xasprintf("~%s/", pw->pw_name));
}
}
endpwent(); /* don't keep password file open */
return 1 + userlen;
}
# endif /* FEATURE_USERNAME_COMPLETION */
enum {
FIND_EXE_ONLY = 0,
FIND_DIR_ONLY = 1,
FIND_FILE_ONLY = 2,
};
static unsigned path_parse(char ***p)
{
unsigned npth;
const char *pth;
char *tmp;
char **res;
# if EDITING_HAS_path_lookup
if (state->flags & WITH_PATH_LOOKUP)
pth = state->path_lookup;
else
# endif
pth = getenv("PATH");
/* PATH="" or PATH=":"? */
if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
return 1;
tmp = (char*)pth;
npth = 1; /* path component count */
while (1) {
tmp = strchr(tmp, ':');
if (!tmp)
break;
tmp++;
npth++;
}
*p = res = xzalloc((npth + 1) * sizeof(res[0]));
res[0] = tmp = xstrdup(pth);
npth = 1;
while (1) {
tmp = strchr(tmp, ':');
if (!tmp)
break;
*tmp++ = '\0'; /* ':' -> '\0' */
res[npth++] = tmp;
}
/* special case: "match subdirectories of the current directory" */
/*res[npth++] = NULL; - filled by xzalloc() */
return npth;
}
/* Complete command, directory or file name.
* Return the length of the prefix used for matching.
*/
static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
{
char *path1[1];
char **paths = path1;
unsigned npaths;
unsigned i;
unsigned baselen;
const char *basecmd;
char *dirbuf = NULL;
npaths = 1;
path1[0] = (char*)".";
basecmd = strrchr(command, '/');
if (!basecmd) {
if (type == FIND_EXE_ONLY)
npaths = path_parse(&paths);
basecmd = command;
} else {
/* point to 'l' in "..../last_component" */
basecmd++;
/* dirbuf = ".../.../.../" */
dirbuf = xstrndup(command, basecmd - command);
# if ENABLE_FEATURE_USERNAME_COMPLETION
if (dirbuf[0] == '~') /* ~/... or ~user/... */
dirbuf = username_path_completion(dirbuf);
# endif
path1[0] = dirbuf;
}
baselen = strlen(basecmd);
if (type == FIND_EXE_ONLY && !dirbuf) {
# if ENABLE_FEATURE_SH_STANDALONE && NUM_APPLETS != 1
const char *p = applet_names;
while (*p) {
if (strncmp(basecmd, p, baselen) == 0)
add_match(xstrdup(p));
while (*p++ != '\0')
continue;
}
# endif
# if EDITING_HAS_get_exe_name
if (state->get_exe_name) {
i = 0;
for (;;) {
const char *b = state->get_exe_name(i++);
if (!b)
break;
if (strncmp(basecmd, b, baselen) == 0)
add_match(xstrdup(b));
}
}
# endif
}
for (i = 0; i < npaths; i++) {
DIR *dir;
struct dirent *next;
struct stat st;
char *found;
const char *lpath;
if (paths[i] == NULL) { /* path_parse()'s last component? */
/* in PATH completion, current dir's subdir names
* can be completions (but only subdirs, not files).
*/
type = FIND_DIR_ONLY;
paths[i] = (char *)".";
}
lpath = *paths[i] ? paths[i] : ".";
dir = opendir(lpath);
if (!dir)
continue; /* don't print an error */
while ((next = readdir(dir)) != NULL) {
unsigned len;
const char *name_found = next->d_name;
/* .../<tab>: bash 3.2.0 shows dotfiles, but not . and .. */
if (!basecmd[0] && DOT_OR_DOTDOT(name_found))
continue;
/* match? */
if (strncmp(basecmd, name_found, baselen) != 0)
continue; /* no */
found = concat_path_file(lpath, name_found);
/* NB: stat() first so that we see is it a directory;
* but if that fails, use lstat() so that
* we still match dangling links */
if (stat(found, &st) && lstat(found, &st))
goto cont; /* hmm, remove in progress? */
/* Save only name */
len = strlen(name_found);
found = xrealloc(found, len + 2); /* +2: for slash and NUL */
strcpy(found, name_found);
if (S_ISDIR(st.st_mode)) {
/* skip directories if searching PATH */
if (type == FIND_EXE_ONLY && !dirbuf)
goto cont;
/* name is a directory, add slash */
found[len] = '/';
found[len + 1] = '\0';
} else {
/* skip files if looking for dirs only (example: cd) */
if (type == FIND_DIR_ONLY)
goto cont;
}
/* add it to the list */
add_match(found);
continue;
cont:
free(found);
}
closedir(dir);
} /* for every path */
if (paths != path1) {
free(paths[0]); /* allocated memory is only in first member */
free(paths);
}
free(dirbuf);
return baselen;
}
/* build_match_prefix:
* On entry, match_buf contains everything up to cursor at the moment <tab>
* was pressed. This function looks at it, figures out what part of it
* constitutes the command/file/directory prefix to use for completion,
* and rewrites match_buf to contain only that part.
*/
#define dbg_bmp 0
/* Helpers: */
/* QUOT is used on elements of int_buf[], which are bytes,
* not Unicode chars. Therefore it works correctly even in Unicode mode.
*/
#define QUOT (UCHAR_MAX+1)
static void remove_chunk(int16_t *int_buf, int beg, int end)
{
/* beg must be <= end */
if (beg == end)
return;
while ((int_buf[beg] = int_buf[end]) != 0)
beg++, end++;
if (dbg_bmp) {
int i;
for (i = 0; int_buf[i]; i++)
bb_putchar((unsigned char)int_buf[i]);
bb_putchar('\n');
}
}
/* Caller ensures that match_buf points to a malloced buffer
* big enough to hold strlen(match_buf)*2 + 2
*/
static NOINLINE int build_match_prefix(char *match_buf)
{
int i, j;
int command_mode;
int16_t *int_buf = (int16_t*)match_buf;
if (dbg_bmp) printf("\n%s\n", match_buf);
/* Copy in reverse order, since they overlap */
i = strlen(match_buf);
do {
int_buf[i] = (unsigned char)match_buf[i];
i--;
} while (i >= 0);
/* Mark every \c as "quoted c" */
for (i = 0; int_buf[i]; i++) {
if (int_buf[i] == '\\') {
remove_chunk(int_buf, i, i + 1);
int_buf[i] |= QUOT;
}
}
/* Quote-mark "chars" and 'chars', drop delimiters */
{
int in_quote = 0;
i = 0;
while (int_buf[i]) {
int cur = int_buf[i];
if (!cur)
break;
if (cur == '\'' || cur == '"') {
if (!in_quote || (cur == in_quote)) {
in_quote ^= cur;
remove_chunk(int_buf, i, i + 1);
continue;
}
}
if (in_quote)
int_buf[i] = cur | QUOT;
i++;
}
}
/* Remove everything up to command delimiters:
* ';' ';;' '&' '|' '&&' '||',
* but careful with '>&' '<&' '>|'
*/
for (i = 0; int_buf[i]; i++) {
int cur = int_buf[i];
if (cur == ';' || cur == '&' || cur == '|') {
int prev = i ? int_buf[i - 1] : 0;
if (cur == '&' && (prev == '>' || prev == '<')) {
continue;
} else if (cur == '|' && prev == '>') {
continue;
}
remove_chunk(int_buf, 0, i + 1 + (cur == int_buf[i + 1]));
i = -1; /* back to square 1 */
}
}
/* Remove all `cmd` */
for (i = 0; int_buf[i]; i++) {
if (int_buf[i] == '`') {
for (j = i + 1; int_buf[j]; j++) {
if (int_buf[j] == '`') {
/* `cmd` should count as a word:
* `cmd` c<tab> should search for files c*,
* not commands c*. Therefore we don't drop
* `cmd` entirely, we replace it with single `.
*/
remove_chunk(int_buf, i, j);
goto next;
}
}
/* No closing ` - command mode, remove all up to ` */
remove_chunk(int_buf, 0, i + 1);
break;
next: ;
}
}
/* Remove "cmd (" and "cmd {"
* Example: "if { c<tab>"
* In this example, c should be matched as command pfx.
*/
for (i = 0; int_buf[i]; i++) {
if (int_buf[i] == '(' || int_buf[i] == '{') {
remove_chunk(int_buf, 0, i + 1);
i = -1; /* back to square 1 */
}
}
/* Remove leading unquoted spaces */
for (i = 0; int_buf[i]; i++)
if (int_buf[i] != ' ')
break;
remove_chunk(int_buf, 0, i);
/* Determine completion mode */
command_mode = FIND_EXE_ONLY;
for (i = 0; int_buf[i]; i++) {
if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
if (int_buf[i] == ' '
&& command_mode == FIND_EXE_ONLY
&& (char)int_buf[0] == 'c'
&& (char)int_buf[1] == 'd'
&& i == 2 /* -> int_buf[2] == ' ' */
) {
command_mode = FIND_DIR_ONLY;
} else {
command_mode = FIND_FILE_ONLY;
break;
}
}
}
if (dbg_bmp) printf("command_mode(0:exe/1:dir/2:file):%d\n", command_mode);
/* Remove everything except last word */
for (i = 0; int_buf[i]; i++) /* quasi-strlen(int_buf) */
continue;
for (--i; i >= 0; i--) {
int cur = int_buf[i];
if (cur == ' ' || cur == '<' || cur == '>' || cur == '|' || cur == '&' || cur == '=') {
remove_chunk(int_buf, 0, i + 1);
break;
}
}
/* Convert back to string of _chars_ */
i = 0;
while ((match_buf[i] = int_buf[i]) != '\0')
i++;
if (dbg_bmp) printf("final match_buf:'%s'\n", match_buf);
return command_mode;
}
/*
* Display by column (original idea from ls applet,
* very optimized by me [Vladimir] :)
*/
static void showfiles(void)
{
int ncols, row;
int column_width = 0;
int nfiles = num_matches;
int nrows = nfiles;
int l;
/* find the longest file name - use that as the column width */
for (row = 0; row < nrows; row++) {
l = unicode_strwidth(matches[row]);
if (column_width < l)
column_width = l;
}
column_width += 2; /* min space for columns */
ncols = cmdedit_termw / column_width;
if (ncols > 1) {
nrows /= ncols;
if (nfiles % ncols)
nrows++; /* round up fractionals */
} else {
ncols = 1;
}
for (row = 0; row < nrows; row++) {
int n = row;
int nc;
for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
printf("%s%-*s", matches[n],
(int)(column_width - unicode_strwidth(matches[n])), ""
);
}
if (ENABLE_UNICODE_SUPPORT)
puts(printable_string(matches[n]));
else
puts(matches[n]);
}
}
static const char *is_special_char(char c)
{
// {: It's mandatory to escape { only if entire name is "{"
// (otherwise it's not special. Example: file named "{ "
// can be escaped simply as "{\ "; "{a" or "a{" need no escaping),
// or if shell supports brace expansion
// (ash doesn't, hush optionally does).
// (): unlike {, shell treats () specially even in contexts
// where they clearly are not valid (e.g. "echo )" is an error).
// #: needs escaping to not start a shell comment.
return strchr(" `'\"\\#$~?*[{()&;|<>", c);
// Used to also have %^=+}]: but not necessary to escape?
}
static char *quote_special_chars(char *found)
{
int l = 0;
char *s = xzalloc((strlen(found) + 1) * 2);
while (*found) {
if (is_special_char(*found))
s[l++] = '\\';
s[l++] = *found++;
}
/* s[l] = '\0'; - already is */
return s;
}
/* Do TAB completion */
static NOINLINE void input_tab(smallint *lastWasTab)
{
char *chosen_match;
char *match_buf;
size_t len_found;
/* Length of string used for matching */
unsigned match_pfx_len = match_pfx_len;
int find_type;
# if ENABLE_UNICODE_SUPPORT
/* cursor pos in command converted to multibyte form */
int cursor_mb;
# endif
if (!(state->flags & TAB_COMPLETION))
return;
if (*lastWasTab) {
/* The last char was a TAB too.
* Print a list of all the available choices.
*/
if (num_matches > 0) {
/* cursor will be changed by goto_new_line() */
int sav_cursor = cursor;
goto_new_line();
showfiles();
draw_full(command_len - sav_cursor);
}
return;
}
*lastWasTab = 1;
chosen_match = NULL;
/* Make a local copy of the string up to the position of the cursor.
* build_match_prefix will expand it into int16_t's, need to allocate
* twice as much as the string_len+1.
* (we then also (ab)use this extra space later - see (**))
*/
match_buf = xmalloc(MAX_LINELEN * sizeof(int16_t));
# if !ENABLE_UNICODE_SUPPORT
save_string(match_buf, cursor + 1); /* +1 for NUL */
# else
{
CHAR_T wc = command_ps[cursor];
command_ps[cursor] = BB_NUL;
save_string(match_buf, MAX_LINELEN);
command_ps[cursor] = wc;
cursor_mb = strlen(match_buf);
}
# endif
find_type = build_match_prefix(match_buf);
/* Free up any memory already allocated */
free_tab_completion_data();
# if ENABLE_FEATURE_USERNAME_COMPLETION
/* If the word starts with ~ and there is no slash in the word,
* then try completing this word as a username. */
if (state->flags & USERNAME_COMPLETION)
if (match_buf[0] == '~' && strchr(match_buf, '/') == NULL)
match_pfx_len = complete_username(match_buf);
# endif
/* If complete_username() did not match,
* try to match a command in $PATH, or a directory, or a file */
if (!matches)
match_pfx_len = complete_cmd_dir_file(match_buf, find_type);
/* Account for backslashes which will be inserted
* by quote_special_chars() later */
{
const char *e = match_buf + strlen(match_buf);
const char *s = e - match_pfx_len;
while (s < e)
if (is_special_char(*s++))
match_pfx_len++;
}
/* Remove duplicates */
if (matches) {
unsigned i, n = 0;
qsort_string_vector(matches, num_matches);
for (i = 0; i < num_matches - 1; ++i) {
//if (matches[i] && matches[i+1]) { /* paranoia */
if (strcmp(matches[i], matches[i+1]) == 0) {
free(matches[i]);
//matches[i] = NULL; /* paranoia */
} else {
matches[n++] = matches[i];
}
//}
}
matches[n++] = matches[i];
num_matches = n;
}
/* Did we find exactly one match? */
if (num_matches != 1) { /* no */
char *cp;
beep();
if (!matches)
goto ret; /* no matches at all */
/* Find common prefix */
chosen_match = xstrdup(matches[0]);
for (cp = chosen_match; *cp; cp++) {
unsigned n;
for (n = 1; n < num_matches; n++) {
if (matches[n][cp - chosen_match] != *cp) {
goto stop;
}
}
}
stop:
if (cp == chosen_match) { /* have unique prefix? */
goto ret; /* no */
}
*cp = '\0';
cp = quote_special_chars(chosen_match);
free(chosen_match);
chosen_match = cp;
len_found = strlen(chosen_match);
} else { /* exactly one match */
/* Next <tab> is not a double-tab */
*lastWasTab = 0;
chosen_match = quote_special_chars(matches[0]);
len_found = strlen(chosen_match);
if (chosen_match[len_found-1] != '/') {
chosen_match[len_found] = ' ';
chosen_match[++len_found] = '\0';
}
}
# if !ENABLE_UNICODE_SUPPORT
/* Have space to place the match? */
/* The result consists of three parts with these lengths: */
/* cursor + (len_found - match_pfx_len) + (command_len - cursor) */
/* it simplifies into: */
if ((int)(len_found - match_pfx_len + command_len) < S.maxsize) {
int pos;
/* save tail */
strcpy(match_buf, &command_ps[cursor]);
/* add match and tail */
sprintf(&command_ps[cursor], "%s%s", chosen_match + match_pfx_len, match_buf);
command_len = strlen(command_ps);
/* new pos */
pos = cursor + len_found - match_pfx_len;
/* write out the matched command */
redraw(cmdedit_y, command_len - pos);
}
# else
{
/* Use 2nd half of match_buf as scratch space - see (**) */
char *command = match_buf + MAX_LINELEN;
int len = save_string(command, MAX_LINELEN);
/* Have space to place the match? */
/* cursor_mb + (len_found - match_pfx_len) + (len - cursor_mb) */
if ((int)(len_found - match_pfx_len + len) < MAX_LINELEN) {
int pos;
/* save tail */
strcpy(match_buf, &command[cursor_mb]);
/* where do we want to have cursor after all? */
strcpy(&command[cursor_mb], chosen_match + match_pfx_len);
len = load_string(command);
/* add match and tail */
stpcpy(stpcpy(&command[cursor_mb], chosen_match + match_pfx_len), match_buf);
command_len = load_string(command);
/* write out the matched command */
/* paranoia: load_string can return 0 on conv error,
* prevent passing pos = (0 - 12) to redraw */
pos = command_len - len;
redraw(cmdedit_y, pos >= 0 ? pos : 0);
}
}
# endif
ret:
free(chosen_match);
free(match_buf);
}
#endif /* FEATURE_TAB_COMPLETION */
line_input_t* FAST_FUNC new_line_input_t(int flags)
{
line_input_t *n = xzalloc(sizeof(*n));
n->flags = flags;
n->timeout = -1;
#if MAX_HISTORY > 0
n->max_history = MAX_HISTORY;
#endif
return n;
}
#if MAX_HISTORY > 0
unsigned FAST_FUNC size_from_HISTFILESIZE(const char *hp)
{
int size = MAX_HISTORY;
if (hp) {
size = atoi(hp);
if (size <= 0)
return 1;
if (size > MAX_HISTORY)
return MAX_HISTORY;
}
return size;
}
static void save_command_ps_at_cur_history(void)
{
if (command_ps[0] != BB_NUL) {
int cur = state->cur_history;
free(state->history[cur]);
# if ENABLE_UNICODE_SUPPORT
{
char tbuf[MAX_LINELEN];
save_string(tbuf, sizeof(tbuf));
state->history[cur] = xstrdup(tbuf);
}
# else
state->history[cur] = xstrdup(command_ps);
# endif
}
}
/* state->flags is already checked to be nonzero */
static int get_previous_history(void)
{
if ((state->flags & DO_HISTORY) && state->cur_history) {
save_command_ps_at_cur_history();
state->cur_history--;
return 1;
}
beep();
return 0;
}
static int get_next_history(void)
{
if (state->flags & DO_HISTORY) {
if (state->cur_history < state->cnt_history) {
save_command_ps_at_cur_history(); /* save the current history line */
return ++state->cur_history;
}
}
beep();
return 0;
}
/* Lists command history. Used by shell 'history' builtins */
void FAST_FUNC show_history(const line_input_t *st)
{
int i;
if (!st)
return;
for (i = 0; i < st->cnt_history; i++)
printf("%4d %s\n", i, st->history[i]);
}
# if ENABLE_FEATURE_EDITING_SAVEHISTORY
void FAST_FUNC free_line_input_t(line_input_t *n)
{
if (n) {
int i = n->cnt_history;
while (i > 0)
free(n->history[--i]);
free(n);
}
}
# else
/* #defined to free() in libbb.h */
# endif
# if ENABLE_FEATURE_EDITING_SAVEHISTORY
/* We try to ensure that concurrent additions to the history
* do not overwrite each other.
* Otherwise shell users get unhappy.
*
* History file is trimmed lazily, when it grows several times longer
* than configured MAX_HISTORY lines.
*/
/* state->flags is already checked to be nonzero */
static void load_history(line_input_t *st_parm)
{
char *temp_h[MAX_HISTORY];
char *line;
FILE *fp;
unsigned idx, i, line_len;
/* NB: do not trash old history if file can't be opened */
fp = fopen_for_read(st_parm->hist_file);
if (fp) {
/* clean up old history */
for (idx = st_parm->cnt_history; idx > 0;) {
idx--;
free(st_parm->history[idx]);
st_parm->history[idx] = NULL;
}
/* fill temp_h[], retaining only last MAX_HISTORY lines */
memset(temp_h, 0, sizeof(temp_h));
idx = 0;
st_parm->cnt_history_in_file = 0;
while ((line = xmalloc_fgetline(fp)) != NULL) {
if (line[0] == '\0') {
free(line);
continue;
}
free(temp_h[idx]);
temp_h[idx] = line;
st_parm->cnt_history_in_file++;
idx++;
if (idx == st_parm->max_history)
idx = 0;
}
fclose(fp);
/* find first non-NULL temp_h[], if any */
if (st_parm->cnt_history_in_file) {
while (temp_h[idx] == NULL) {
idx++;
if (idx == st_parm->max_history)
idx = 0;
}
}
/* copy temp_h[] to st_parm->history[] */
for (i = 0; i < st_parm->max_history;) {
line = temp_h[idx];
if (!line)
break;
idx++;
if (idx == st_parm->max_history)
idx = 0;
line_len = strlen(line);
if (line_len >= MAX_LINELEN)
line[MAX_LINELEN-1] = '\0';
st_parm->history[i++] = line;
}
st_parm->cnt_history = i;
if (ENABLE_FEATURE_EDITING_SAVE_ON_EXIT)
st_parm->cnt_history_in_file = i;
}
}
# if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
void save_history(line_input_t *st)
{
FILE *fp;
if (!st || !st->hist_file)
return;
if (st->cnt_history <= st->cnt_history_in_file)
return;
fp = fopen(st->hist_file, "a");
if (fp) {
int i, fd;
char *new_name;
line_input_t *st_temp;
for (i = st->cnt_history_in_file; i < st->cnt_history; i++)
fprintf(fp, "%s\n", st->history[i]);
fclose(fp);
/* we may have concurrently written entries from others.
* load them */
st_temp = new_line_input_t(st->flags);
st_temp->hist_file = st->hist_file;
st_temp->max_history = st->max_history;
load_history(st_temp);
/* write out temp file and replace hist_file atomically */
new_name = xasprintf("%s.%u.new", st->hist_file, (int) getpid());
fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
if (fd >= 0) {
fp = xfdopen_for_write(fd);
for (i = 0; i < st_temp->cnt_history; i++)
fprintf(fp, "%s\n", st_temp->history[i]);
fclose(fp);
if (rename(new_name, st->hist_file) == 0)
st->cnt_history_in_file = st_temp->cnt_history;
}
free(new_name);
free_line_input_t(st_temp);
}
}
# else
static void save_history(char *str)
{
int fd;
int len, len2;
if (!state->hist_file)
return;
fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0600);
if (fd < 0)
return;
xlseek(fd, 0, SEEK_END); /* paranoia */
len = strlen(str);
str[len] = '\n'; /* we (try to) do atomic write */
len2 = full_write(fd, str, len + 1);
str[len] = '\0';
close(fd);
if (len2 != len + 1)
return; /* "wtf?" */
/* did we write so much that history file needs trimming? */
state->cnt_history_in_file++;
if (state->cnt_history_in_file > state->max_history * 4) {
char *new_name;
line_input_t *st_temp;
/* we may have concurrently written entries from others.
* load them */
st_temp = new_line_input_t(state->flags);
st_temp->hist_file = state->hist_file;
st_temp->max_history = state->max_history;
load_history(st_temp);
/* write out temp file and replace hist_file atomically */
new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
if (fd >= 0) {
FILE *fp;
int i;
fp = xfdopen_for_write(fd);
for (i = 0; i < st_temp->cnt_history; i++)
fprintf(fp, "%s\n", st_temp->history[i]);
fclose(fp);
if (rename(new_name, state->hist_file) == 0)
state->cnt_history_in_file = st_temp->cnt_history;
}
free(new_name);
free_line_input_t(st_temp);
}
}
# endif
# else
# define load_history(a) ((void)0)
# define save_history(a) ((void)0)
# endif /* FEATURE_COMMAND_SAVEHISTORY */
static void remember_in_history(char *str)
{
int i;
if (!(state->flags & DO_HISTORY))
return;
if (str[0] == '\0')
return;
i = state->cnt_history;
/* Don't save dupes */
if (i && strcmp(state->history[i-1], str) == 0)
return;
free(state->history[state->max_history]); /* redundant, paranoia */
state->history[state->max_history] = NULL; /* redundant, paranoia */
/* If history[] is full, remove the oldest command */
/* we need to keep history[state->max_history] empty, hence >=, not > */
if (i >= state->max_history) {
free(state->history[0]);
for (i = 0; i < state->max_history-1; i++)
state->history[i] = state->history[i+1];
/* i == state->max_history-1 */
# if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
if (state->cnt_history_in_file)
state->cnt_history_in_file--;
# endif
}
/* i <= state->max_history-1 */
state->history[i++] = xstrdup(str);
/* i <= state->max_history */
state->cur_history = i;
state->cnt_history = i;
# if ENABLE_FEATURE_EDITING_SAVEHISTORY && !ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
save_history(str);
# endif
}
#else /* MAX_HISTORY == 0 */
# define remember_in_history(a) ((void)0)
#endif /* MAX_HISTORY */
#if ENABLE_FEATURE_EDITING_VI
/*
* vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
*/
static void
vi_Word_motion(int eat)
{
CHAR_T *command = command_ps;
while (cursor < command_len && !BB_isspace(command[cursor]))
input_forward();
if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
input_forward();
}
static void
vi_word_motion(int eat)
{
CHAR_T *command = command_ps;
if (BB_isalnum_or_underscore(command[cursor])) {
while (cursor < command_len
&& (BB_isalnum_or_underscore(command[cursor+1]))
) {
input_forward();
}
} else if (BB_ispunct(command[cursor])) {
while (cursor < command_len && BB_ispunct(command[cursor+1]))
input_forward();
}
if (cursor < command_len)
input_forward();
if (eat) {
while (cursor < command_len && BB_isspace(command[cursor]))
input_forward();
}
}
static void
vi_End_motion(void)
{
CHAR_T *command = command_ps;
input_forward();
while (cursor < command_len && BB_isspace(command[cursor]))
input_forward();
while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
input_forward();
}
static void
vi_end_motion(void)
{
CHAR_T *command = command_ps;
if (cursor >= command_len-1)
return;
input_forward();
while (cursor < command_len-1 && BB_isspace(command[cursor]))
input_forward();
if (cursor >= command_len-1)
return;
if (BB_isalnum_or_underscore(command[cursor])) {
while (cursor < command_len-1
&& (BB_isalnum_or_underscore(command[cursor+1]))
) {
input_forward();
}
} else if (BB_ispunct(command[cursor])) {
while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
input_forward();
}
}
static void
vi_Back_motion(void)
{
CHAR_T *command = command_ps;
while (cursor > 0 && BB_isspace(command[cursor-1]))
input_backward(1);
while (cursor > 0 && !BB_isspace(command[cursor-1]))
input_backward(1);
}
static void
vi_back_motion(void)
{
CHAR_T *command = command_ps;
if (cursor <= 0)
return;
input_backward(1);
while (cursor > 0 && BB_isspace(command[cursor]))
input_backward(1);
if (cursor <= 0)
return;
if (BB_isalnum_or_underscore(command[cursor])) {
while (cursor > 0
&& (BB_isalnum_or_underscore(command[cursor-1]))
) {
input_backward(1);
}
} else if (BB_ispunct(command[cursor])) {
while (cursor > 0 && BB_ispunct(command[cursor-1]))
input_backward(1);
}
}
#endif /* ENABLE_FEATURE_EDITING_VI */
/* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
static void ctrl_left(void)
{
CHAR_T *command = command_ps;
while (1) {
CHAR_T c;
input_backward(1);
if (cursor == 0)
break;
c = command[cursor];
if (c != ' ' && !BB_ispunct(c)) {
/* we reached a "word" delimited by spaces/punct.
* go to its beginning */
while (1) {
c = command[cursor - 1];
if (c == ' ' || BB_ispunct(c))
break;
input_backward(1);
if (cursor == 0)
break;
}
break;
}
}
}
static void ctrl_right(void)
{
CHAR_T *command = command_ps;
while (1) {
CHAR_T c;
c = command[cursor];
if (c == BB_NUL)
break;
if (c != ' ' && !BB_ispunct(c)) {
/* we reached a "word" delimited by spaces/punct.
* go to its end + 1 */
while (1) {
input_forward();
c = command[cursor];
if (c == BB_NUL || c == ' ' || BB_ispunct(c))
break;
}
break;
}
input_forward();
}
}
/*
* read_line_input and its helpers
*/
#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
static void ask_terminal(void)
{
/* Ask terminal where is the cursor now.
* lineedit_read_key handles response and corrects
* our idea of current cursor position.
* Testcase: run "echo -n long_line_long_line_long_line",
* then type in a long, wrapping command and try to
* delete it using backspace key.
* Note: we print it _after_ prompt, because
* prompt may contain CR. Example: PS1='\[\r\n\]\w '
*/
/* Problem: if there is buffered input on stdin,
* the response will be delivered later,
* possibly to an unsuspecting application.
* Testcase: "sleep 1; busybox ash" + press and hold [Enter].
* Result:
* ~/srcdevel/bbox/fix/busybox.t4 #
* ~/srcdevel/bbox/fix/busybox.t4 #
* ^[[59;34~/srcdevel/bbox/fix/busybox.t4 # <-- garbage
* ~/srcdevel/bbox/fix/busybox.t4 #
*
* Checking for input with poll only makes the race narrower,
* I still can trigger it. Strace:
*
* write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
* poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout) <-- no input exists
* write(1, "\33[6n", 4) = 4 <-- send the ESC sequence, quick!
* poll([{fd=0, events=POLLIN}], 1, -1) = 1 ([{fd=0, revents=POLLIN}])
* read(0, "\n", 1) = 1 <-- oh crap, user's input got in first
*/
struct pollfd pfd;
pfd.fd = STDIN_FILENO;
pfd.events = POLLIN;
if (safe_poll(&pfd, 1, 0) == 0) {
S.sent_ESC_br6n = 1;
fputs_stdout(ESC"[6n");
fflush_all(); /* make terminal see it ASAP! */
}
}
#else
# define ask_terminal() ((void)0)
#endif
/* Note about multi-line PS1 (e.g. "\n\w \u@\h\n> ") and prompt redrawing:
*
* If the prompt has any newlines, after we print it once we use only its last
* line to redraw in-place, which makes it simpler to calculate how many lines
* we should move the cursor up to align the redraw (cmdedit_y). The earlier
* prompt lines just stay on screen and we redraw below them.
*
* Use cases for all prompt lines beyond the initial draw:
* - After clear-screen (^L) or after displaying tab-completion choices, we
* print the full prompt, as it isn't redrawn in-place.
* - During terminal resize we could try to redraw all lines, but we don't,
* because it requires delicate alignment, it's good enough with only the
* last line, and doing it wrong is arguably worse than not doing it at all.
*
* Terminology wise, if it doesn't mention "full", then it means the last/sole
* prompt line. We use the prompt (last/sole line) while redrawing in-place,
* and the full where we need a fresh one unrelated to an earlier position.
*
* If PS1 is not multiline, the last/sole line and the full are the same string.
*/
/* Called just once at read_line_input() init time */
#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
static void parse_and_put_prompt(const char *prmt_ptr)
{
const char *p;
cmdedit_prompt = prompt_last_line = prmt_ptr;
p = strrchr(prmt_ptr, '\n');
if (p)
prompt_last_line = p + 1;
cmdedit_prmt_len = unicode_strwidth(prompt_last_line);
put_prompt();
}
#else
static void parse_and_put_prompt(const char *prmt_ptr)
{
int prmt_size = 0;
char *prmt_mem_ptr = xzalloc(1);
char *cwd_buf = NULL;
char flg_not_length = '[';
char cbuf[2];
/*cmdedit_prmt_len = 0; - already is */
cbuf[1] = '\0'; /* never changes */
while (*prmt_ptr) {
char timebuf[sizeof("HH:MM:SS")];
char *free_me = NULL;
char *pbuf;
char c;
pbuf = cbuf;
c = *prmt_ptr++;
if (c == '\\') {
const char *cp;
int l;
/*
* Supported via bb_process_escape_sequence:
* \a ASCII bell character (07)
* \e ASCII escape character (033)
* \n newline
* \r carriage return
* \\ backslash
* \nnn char with octal code nnn
* Supported:
* \$ if the effective UID is 0, a #, otherwise a $
* \w current working directory, with $HOME abbreviated with a tilde
* Note: we do not support $PROMPT_DIRTRIM=n feature
* \W basename of the current working directory, with $HOME abbreviated with a tilde
* \h hostname up to the first '.'
* \H hostname
* \u username
* \[ begin a sequence of non-printing characters
* \] end a sequence of non-printing characters
* \T current time in 12-hour HH:MM:SS format
* \@ current time in 12-hour am/pm format
* \A current time in 24-hour HH:MM format
* \t current time in 24-hour HH:MM:SS format
* (all of the above work as \A)
* Not supported:
* \! history number of this command
* \# command number of this command
* \j number of jobs currently managed by the shell
* \l basename of the shell's terminal device name
* \s name of the shell, the basename of $0 (the portion following the final slash)
* \V release of bash, version + patch level (e.g., 2.00.0)
* \d date in "Weekday Month Date" format (e.g., "Tue May 26")
* \D{format}
* format is passed to strftime(3).
* An empty format results in a locale-specific time representation.
* The braces are required.
* Mishandled by bb_process_escape_sequence:
* \v version of bash (e.g., 2.00)
*/
cp = prmt_ptr;
c = *cp;
if (c != 't') /* don't treat \t as tab */
c = bb_process_escape_sequence(&prmt_ptr);
if (prmt_ptr == cp) {
if (*cp == '\0')
break;
c = *prmt_ptr++;
switch (c) {
case 'u':
pbuf = user_buf ? user_buf : (char*)"";
break;
case 'H':
case 'h':
pbuf = free_me = safe_gethostname();
if (c == 'h')
strchrnul(pbuf, '.')[0] = '\0';
break;
case '$':
c = (geteuid() == 0 ? '#' : '$');
break;
case 'T': /* 12-hour HH:MM:SS format */
case '@': /* 12-hour am/pm format */
case 'A': /* 24-hour HH:MM format */
case 't': /* 24-hour HH:MM:SS format */
/* We show all of them as 24-hour HH:MM */
strftime_HHMMSS(timebuf, sizeof(timebuf), NULL)[-3] = '\0';
pbuf = timebuf;
break;
case 'w': /* current dir */
case 'W': /* basename of cur dir */
if (!cwd_buf) {
cwd_buf = xrealloc_getcwd_or_warn(NULL);
if (!cwd_buf)
cwd_buf = (char *)bb_msg_unknown;
else if (home_pwd_buf[0]) {
char *after_home_user;
/* /home/user[/something] -> ~[/something] */
after_home_user = is_prefixed_with(cwd_buf, home_pwd_buf);
if (after_home_user
&& (*after_home_user == '/' || *after_home_user == '\0')
) {
cwd_buf[0] = '~';
overlapping_strcpy(cwd_buf + 1, after_home_user);
}
}
}
pbuf = cwd_buf;
if (c == 'w')
break;
cp = strrchr(pbuf, '/');
if (cp)
pbuf = (char*)cp + 1;
break;
// bb_process_escape_sequence does this now:
// case 'e': case 'E': /* \e \E = \033 */
// c = '\033';
// break;
case 'x': case 'X': {
char buf2[4];
for (l = 0; l < 3;) {
unsigned h;
buf2[l++] = *prmt_ptr;
buf2[l] = '\0';
h = strtoul(buf2, &pbuf, 16);
if (h > UCHAR_MAX || (pbuf - buf2) < l) {
buf2[--l] = '\0';
break;
}
prmt_ptr++;
}
c = (char)strtoul(buf2, NULL, 16);
if (c == 0)
c = '?';
pbuf = cbuf;
break;
}
case '[': case ']':
if (c == flg_not_length) {
/* Toggle '['/']' hex 5b/5d */
flg_not_length ^= 6;
continue;
}
break;
} /* switch */
} /* if */
} /* if */
cbuf[0] = c;
{
int n = strlen(pbuf);
prmt_size += n;
if (c == '\n')
cmdedit_prmt_len = 0;
else if (flg_not_length != ']') {
# if ENABLE_UNICODE_SUPPORT
if (n == 1) {
/* Only count single-byte characters and the first of multi-byte characters */
if ((unsigned char)*pbuf < 0x80 /* single byte character */
|| (unsigned char)*pbuf >= 0xc0 /* first of multi-byte characters */
) {
cmdedit_prmt_len += n;
}
} else {
cmdedit_prmt_len += unicode_strwidth(pbuf);
}
# else
cmdedit_prmt_len += n;
# endif
}
}
prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_size+1), pbuf);
free(free_me);
} /* while */
if (cwd_buf != (char *)bb_msg_unknown)
free(cwd_buf);
/* see comment (above this function) about multiline prompt redrawing */
cmdedit_prompt = prompt_last_line = prmt_mem_ptr;
prmt_ptr = strrchr(cmdedit_prompt, '\n');
if (prmt_ptr)
prompt_last_line = prmt_ptr + 1;
put_prompt();
}
#endif /* FEATURE_EDITING_FANCY_PROMPT */
#if ENABLE_FEATURE_EDITING_WINCH
static void cmdedit_setwidth(void)
{
int new_y;
cmdedit_termw = get_terminal_width(STDIN_FILENO);
/* new y for current cursor */
new_y = (cursor + cmdedit_prmt_len) / cmdedit_termw;
/* redraw */
redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
}
static void win_changed(int nsig UNUSED_PARAM)
{
if (S.ok_to_redraw) {
/* We are in read_key(), safe to redraw immediately */
int sv_errno = errno;
cmdedit_setwidth();
fflush_all();
errno = sv_errno;
} else {
/* Signal main loop that redraw is necessary */
S.SIGWINCH_count++;
}
}
#endif
static int lineedit_read_key(char *read_key_buffer, int timeout)
{
int64_t ic;
#if ENABLE_UNICODE_SUPPORT
char unicode_buf[MB_CUR_MAX + 1];
int unicode_idx = 0;
#endif
fflush_all();
while (1) {
/* Wait for input. TIMEOUT = -1 makes read_key wait even
* on nonblocking stdin, TIMEOUT = 50 makes sure we won't
* insist on full MB_CUR_MAX buffer to declare input like
* "\xff\n",pause,"ls\n" invalid and thus won't lose "ls".
*
* Note: read_key sets errno to 0 on success.
*/
IF_FEATURE_EDITING_WINCH(S.ok_to_redraw = 1;)
ic = read_key(STDIN_FILENO, read_key_buffer, timeout);
IF_FEATURE_EDITING_WINCH(S.ok_to_redraw = 0;)
if (errno) {
#if ENABLE_UNICODE_SUPPORT
if (errno == EAGAIN && unicode_idx != 0)
goto pushback;
#endif
break;
}
#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
if ((int32_t)ic == KEYCODE_CURSOR_POS
&& S.sent_ESC_br6n
) {
S.sent_ESC_br6n = 0;
if (cursor == 0) { /* otherwise it may be bogus */
int col = ((ic >> 32) & 0x7fff) - 1;
/*
* Is col > cmdedit_prmt_len?
* If yes (terminal says cursor is farther to the right
* of where we think it should be),
* the prompt wasn't printed starting at col 1,
* there was additional text before it.
*/
if ((int)(col - cmdedit_prmt_len) > 0) {
/* Fix our understanding of current x position */
cmdedit_x += (col - cmdedit_prmt_len);
while (cmdedit_x >= cmdedit_termw) {
cmdedit_x -= cmdedit_termw;
cmdedit_y++;
}
}
}
continue;
}
#endif
#if ENABLE_UNICODE_SUPPORT
if (unicode_status == UNICODE_ON) {
wchar_t wc;
if ((int32_t)ic < 0) /* KEYCODE_xxx */
break;
// TODO: imagine sequence like: 0xff,<left-arrow>: we are currently losing 0xff...
unicode_buf[unicode_idx++] = ic;
unicode_buf[unicode_idx] = '\0';
if (mbstowcs(&wc, unicode_buf, 1) != 1) {
/* Not (yet?) a valid unicode char */
if (unicode_idx < MB_CUR_MAX) {
timeout = 50;
continue;
}
pushback:
/* Invalid sequence. Save all "bad bytes" except first */
read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1);
# if !ENABLE_UNICODE_PRESERVE_BROKEN
ic = CONFIG_SUBST_WCHAR;
# else
ic = unicode_mark_raw_byte(unicode_buf[0]);
# endif
} else {
/* Valid unicode char, return its code */
ic = wc;
}
}
#endif
break;
}
return ic;
}
#if ENABLE_UNICODE_BIDI_SUPPORT
static int isrtl_str(void)
{
int idx = cursor;
while (idx < command_len && unicode_bidi_is_neutral_wchar(command_ps[idx]))
idx++;
return unicode_bidi_isrtl(command_ps[idx]);
}
#else
# define isrtl_str() 0
#endif
/* leave out the "vi-mode"-only case labels if vi editing isn't
* configured. */
#define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)
/* convert uppercase ascii to equivalent control char, for readability */
#undef CTRL
#define CTRL(a) ((a) & ~0x40)
enum {
VI_CMDMODE_BIT = 0x40000000,
/* 0x80000000 bit flags KEYCODE_xxx */
};
#if ENABLE_FEATURE_REVERSE_SEARCH
/* Mimic readline Ctrl-R reverse history search.
* When invoked, it shows the following prompt:
* (reverse-i-search)'': user_input [cursor pos unchanged by Ctrl-R]
* and typing results in search being performed:
* (reverse-i-search)'tmp': cd /tmp [cursor under t in /tmp]
* Search is performed by looking at progressively older lines in history.
* Ctrl-R again searches for the next match in history.
* Backspace deletes last matched char.
* Control keys exit search and return to normal editing (at current history line).
*/
static int32_t reverse_i_search(int timeout)
{
char match_buf[128]; /* for user input */
char read_key_buffer[KEYCODE_BUFFER_SIZE];
const char *matched_history_line;
const char *saved_prompt;
unsigned saved_prmt_len;
int32_t ic;
matched_history_line = NULL;
read_key_buffer[0] = 0;
match_buf[0] = '\0';
/* Save and replace the prompt */
saved_prompt = prompt_last_line;
saved_prmt_len = cmdedit_prmt_len;
goto set_prompt;
while (1) {
int h;
unsigned match_buf_len = strlen(match_buf);
//FIXME: correct timeout? (i.e. count it down?)
ic = lineedit_read_key(read_key_buffer, timeout);
switch (ic) {
case CTRL('R'): /* searching for the next match */
break;
case '\b':
case '\x7f':
/* Backspace */
if (unicode_status == UNICODE_ON) {
while (match_buf_len != 0) {
uint8_t c = match_buf[--match_buf_len];
if ((c & 0xc0) != 0x80) /* start of UTF-8 char? */
break; /* yes */
}
} else {
if (match_buf_len != 0)
match_buf_len--;
}
match_buf[match_buf_len] = '\0';
break;
default:
if (ic < ' '
|| (!ENABLE_UNICODE_SUPPORT && ic >= 256)
|| (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
) {
goto ret;
}
/* Append this char */
# if ENABLE_UNICODE_SUPPORT
if (unicode_status == UNICODE_ON) {
mbstate_t mbstate = { 0 };
char buf[MB_CUR_MAX + 1];
int len = wcrtomb(buf, ic, &mbstate);
if (len > 0) {
buf[len] = '\0';
if (match_buf_len + len < sizeof(match_buf))
strcpy(match_buf + match_buf_len, buf);
}
} else
# endif
if (match_buf_len < sizeof(match_buf) - 1) {
match_buf[match_buf_len] = ic;
match_buf[match_buf_len + 1] = '\0';
}
break;
} /* switch (ic) */
/* Search in history for match_buf */
h = state->cur_history;
if (ic == CTRL('R'))
h--;
while (h >= 0) {
if (state->history[h]) {
char *match = strstr(state->history[h], match_buf);
if (match) {
state->cur_history = h;
matched_history_line = state->history[h];
command_len = load_string(matched_history_line);
cursor = match - matched_history_line;
//FIXME: cursor position for Unicode case
free((char*)prompt_last_line);
set_prompt:
prompt_last_line = xasprintf("(reverse-i-search)'%s': ", match_buf);
cmdedit_prmt_len = unicode_strwidth(prompt_last_line);
goto do_redraw;
}
}
h--;
}
/* Not found */
match_buf[match_buf_len] = '\0';
beep();
continue;
do_redraw:
redraw(cmdedit_y, command_len - cursor);
} /* while (1) */
ret:
if (matched_history_line)
command_len = load_string(matched_history_line);
free((char*)prompt_last_line);
prompt_last_line = saved_prompt;
cmdedit_prmt_len = saved_prmt_len;
redraw(cmdedit_y, command_len - cursor);
return ic;
}
#endif /* ENABLE_FEATURE_REVERSE_SEARCH */
#if ENABLE_FEATURE_EDITING_WINCH
static void sigaction2(int sig, struct sigaction *act)
{
// Grr... gcc 8.1.1:
// "passing argument 3 to restrict-qualified parameter aliases with argument 2"
// dance around that...
struct sigaction *oact FIX_ALIASING;
oact = act;
sigaction(sig, act, oact);
}
#endif
/* maxsize must be >= 2.
* Returns:
* -1 on read errors or EOF, or on bare Ctrl-D,
* 0 on ctrl-C (the line entered is still returned in 'command'),
* (in both cases the cursor remains on the input line, '\n' is not printed)
* >0 length of input string, including terminating '\n'
*/
int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *command, int maxsize)
{
int len, n;
int timeout;
#if ENABLE_FEATURE_TAB_COMPLETION
smallint lastWasTab = 0;
#endif
smallint break_out = 0;
#if ENABLE_FEATURE_EDITING_VI
smallint vi_cmdmode = 0;
#endif
struct termios initial_settings;
struct termios new_settings;
char read_key_buffer[KEYCODE_BUFFER_SIZE];
INIT_S();
//command_len = 0; - done by INIT_S()
//cmdedit_y = 0; /* quasireal y, not true if line > xt*yt */
cmdedit_termw = 80;
IF_USERNAME_OR_HOMEDIR(home_pwd_buf = (char*)null_str;)
IF_FEATURE_EDITING_VI(delptr = delbuf;)
n = get_termios_and_make_raw(STDIN_FILENO, &new_settings, &initial_settings, 0
| TERMIOS_CLEAR_ISIG /* turn off INTR (ctrl-C), QUIT, SUSP */
);
if (n != 0 || (initial_settings.c_lflag & (ECHO|ICANON)) == ICANON) {
/* Happens when e.g. stty -echo was run before.
* But if ICANON is not set, we don't come here.
* (example: interactive python ^Z-backgrounded,
* tty is still in "raw mode").
*/
parse_and_put_prompt(prompt);
fflush_all();
if (fgets(command, maxsize, stdin) == NULL)
len = -1; /* EOF or error */
else
len = strlen(command);
DEINIT_S();
return len;
}
init_unicode();
// FIXME: audit & improve this
if (maxsize > MAX_LINELEN)
maxsize = MAX_LINELEN;
S.maxsize = maxsize;
timeout = -1;
/* Make state->flags == 0 if st is NULL.
* With zeroed flags, no other fields are ever referenced.
*/
state = (line_input_t*) &const_int_0;
if (st) {
state = st;
timeout = st->timeout;
}
#if MAX_HISTORY > 0
if (state->flags & DO_HISTORY) {
# if ENABLE_FEATURE_EDITING_SAVEHISTORY
if (state->hist_file)
if (state->cnt_history == 0)
load_history(state);
# endif
state->cur_history = state->cnt_history;
}
#endif
/* prepare before init handlers */
#if ENABLE_UNICODE_SUPPORT
command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
#else
command_ps = command;
command[0] = '\0';
#endif
#define command command_must_not_be_used
tcsetattr_stdin_TCSANOW(&new_settings);
#if ENABLE_USERNAME_OR_HOMEDIR
{
struct passwd *entry;
entry = getpwuid(geteuid());
if (entry) {
user_buf = xstrdup(entry->pw_name);
home_pwd_buf = xstrdup(entry->pw_dir);
}
}
#endif
#if 0
for (i = 0; i <= state->max_history; i++)
bb_error_msg("history[%d]:'%s'", i, state->history[i]);
bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
#endif
/* Get width (before printing prompt) */
cmdedit_termw = get_terminal_width(STDIN_FILENO);
/* Print out the command prompt, optionally ask where cursor is */
parse_and_put_prompt(prompt);
ask_terminal();
#if ENABLE_FEATURE_EDITING_WINCH
/* Install window resize handler (NB: after *all* init is complete) */
S.SIGWINCH_handler.sa_handler = win_changed;
S.SIGWINCH_handler.sa_flags = SA_RESTART;
sigaction2(SIGWINCH, &S.SIGWINCH_handler);
#endif
read_key_buffer[0] = 0;
while (1) {
/*
* The emacs and vi modes share much of the code in the big
* command loop. Commands entered when in vi's command mode
* (aka "escape mode") get an extra bit added to distinguish
* them - this keeps them from being self-inserted. This
* clutters the big switch a bit, but keeps all the code
* in one place.
*/
int32_t ic, ic_raw;
#if ENABLE_FEATURE_EDITING_WINCH
unsigned count;
count = S.SIGWINCH_count;
if (S.SIGWINCH_saved != count) {
S.SIGWINCH_saved = count;
cmdedit_setwidth();
}
#endif
ic = ic_raw = lineedit_read_key(read_key_buffer, timeout);
#if ENABLE_FEATURE_REVERSE_SEARCH
again:
#endif
#if ENABLE_FEATURE_EDITING_VI
newdelflag = 1;
if (vi_cmdmode) {
/* btw, since KEYCODE_xxx are all < 0, this doesn't
* change ic if it contains one of them: */
ic |= VI_CMDMODE_BIT;
}
#endif
switch (ic) {
case '\n':
case '\r':
vi_case('\n'|VI_CMDMODE_BIT:)
vi_case('\r'|VI_CMDMODE_BIT:)
/* Enter */
goto_new_line();
break_out = 1;
break;
case CTRL('A'):
vi_case('0'|VI_CMDMODE_BIT:)
/* Control-a -- Beginning of line */
input_backward(cursor);
break;
case CTRL('B'):
vi_case('h'|VI_CMDMODE_BIT:)
vi_case('\b'|VI_CMDMODE_BIT:) /* ^H */
vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
input_backward(1); /* Move back one character */
break;
case CTRL('E'):
vi_case('$'|VI_CMDMODE_BIT:)
/* Control-e -- End of line */
put_till_end_and_adv_cursor();
break;
case CTRL('F'):
vi_case('l'|VI_CMDMODE_BIT:)
vi_case(' '|VI_CMDMODE_BIT:)
input_forward(); /* Move forward one character */
break;
case '\b': /* ^H */
case '\x7f': /* DEL */
if (!isrtl_str())
input_backspace();
else
input_delete(0);
break;
case KEYCODE_DELETE:
if (!isrtl_str())
input_delete(0);
else
input_backspace();
break;
#if ENABLE_FEATURE_TAB_COMPLETION
case '\t':
input_tab(&lastWasTab);
break;
#endif
case CTRL('K'):
/* Control-k -- clear to end of line */
command_ps[cursor] = BB_NUL;
command_len = cursor;
printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
break;
case CTRL('L'):
vi_case(CTRL('L')|VI_CMDMODE_BIT:)
/* Control-l -- clear screen */
/* cursor to top,left; clear to the end of screen */
printf(ESC"[H" ESC"[J");
draw_full(command_len - cursor);
break;
#if MAX_HISTORY > 0
case CTRL('N'):
vi_case(CTRL('N')|VI_CMDMODE_BIT:)
vi_case('j'|VI_CMDMODE_BIT:)
/* Control-n -- Get next command in history */
if (get_next_history())
goto rewrite_line;
break;
case CTRL('P'):
vi_case(CTRL('P')|VI_CMDMODE_BIT:)
vi_case('k'|VI_CMDMODE_BIT:)
/* Control-p -- Get previous command from history */
if (get_previous_history())
goto rewrite_line;
break;
#endif
case CTRL('U'):
vi_case(CTRL('U')|VI_CMDMODE_BIT:)
/* Control-U -- Clear line before cursor */
if (cursor) {
command_len -= cursor;
memmove(command_ps, command_ps + cursor,
(command_len + 1) * sizeof(command_ps[0]));
redraw(cmdedit_y, command_len);
}
break;
case CTRL('W'):
vi_case(CTRL('W')|VI_CMDMODE_BIT:)
/* Control-W -- Remove the last word */
while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
input_backspace();
while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
input_backspace();
break;
case KEYCODE_ALT_D: {
/* Delete word forward */
int nc, sc = cursor;
ctrl_right();
nc = cursor - sc;
input_backward(nc);
while (--nc >= 0)
input_delete(1);
break;
}
case KEYCODE_ALT_BACKSPACE: {
/* Delete word backward */
int sc = cursor;
ctrl_left();
while (sc-- > cursor)
input_delete(1);
break;
}
#if ENABLE_FEATURE_REVERSE_SEARCH
case CTRL('R'):
ic = ic_raw = reverse_i_search(timeout);
goto again;
#endif
#if ENABLE_FEATURE_EDITING_VI
case 'i'|VI_CMDMODE_BIT:
vi_cmdmode = 0;
break;
case 'I'|VI_CMDMODE_BIT:
input_backward(cursor);
vi_cmdmode = 0;
break;
case 'a'|VI_CMDMODE_BIT:
input_forward();
vi_cmdmode = 0;
break;
case 'A'|VI_CMDMODE_BIT:
put_till_end_and_adv_cursor();
vi_cmdmode = 0;
break;
case 'x'|VI_CMDMODE_BIT:
input_delete(1);
break;
case 'X'|VI_CMDMODE_BIT:
if (cursor > 0) {
input_backward(1);
input_delete(1);
}
break;
case 'W'|VI_CMDMODE_BIT:
vi_Word_motion(1);
break;
case 'w'|VI_CMDMODE_BIT:
vi_word_motion(1);
break;
case 'E'|VI_CMDMODE_BIT:
vi_End_motion();
break;
case 'e'|VI_CMDMODE_BIT:
vi_end_motion();
break;
case 'B'|VI_CMDMODE_BIT:
vi_Back_motion();
break;
case 'b'|VI_CMDMODE_BIT:
vi_back_motion();
break;
case 'C'|VI_CMDMODE_BIT:
vi_cmdmode = 0;
/* fall through */
case 'D'|VI_CMDMODE_BIT:
goto clear_to_eol;
case 'c'|VI_CMDMODE_BIT:
vi_cmdmode = 0;
/* fall through */
case 'd'|VI_CMDMODE_BIT: {
int nc, sc;
ic = lineedit_read_key(read_key_buffer, timeout);
if (errno) /* error */
goto return_error_indicator;
if (ic == ic_raw) { /* "cc", "dd" */
input_backward(cursor);
goto clear_to_eol;
break;
}
sc = cursor;
switch (ic) {
case 'w':
case 'W':
case 'e':
case 'E':
switch (ic) {
case 'w': /* "dw", "cw" */
vi_word_motion(vi_cmdmode);
break;
case 'W': /* 'dW', 'cW' */
vi_Word_motion(vi_cmdmode);
break;
case 'e': /* 'de', 'ce' */
vi_end_motion();
input_forward();
break;
case 'E': /* 'dE', 'cE' */
vi_End_motion();
input_forward();
break;
}
nc = cursor;
input_backward(cursor - sc);
while (nc-- > cursor)
input_delete(1);
break;
case 'b': /* "db", "cb" */
case 'B': /* implemented as B */
if (ic == 'b')
vi_back_motion();
else
vi_Back_motion();
while (sc-- > cursor)
input_delete(1);
break;
case ' ': /* "d ", "c " */
input_delete(1);
break;
case '$': /* "d$", "c$" */
clear_to_eol:
while (cursor < command_len)
input_delete(1);
break;
}
break;
}
case 'p'|VI_CMDMODE_BIT:
input_forward();
/* fallthrough */
case 'P'|VI_CMDMODE_BIT:
put();
break;
case 'r'|VI_CMDMODE_BIT:
//FIXME: unicode case?
ic = lineedit_read_key(read_key_buffer, timeout);
if (errno) /* error */
goto return_error_indicator;
if (ic < ' ' || ic > 255) {
beep();
} else {
command_ps[cursor] = ic;
bb_putchar(ic);
bb_putchar('\b');
}
break;
case '\x1b': /* ESC */
if (state->flags & VI_MODE) {
/* insert mode --> command mode */
vi_cmdmode = 1;
input_backward(1);
}
break;
#endif /* FEATURE_COMMAND_EDITING_VI */
#if MAX_HISTORY > 0
case KEYCODE_UP:
if (get_previous_history())
goto rewrite_line;
beep();
break;
case KEYCODE_DOWN:
if (!get_next_history())
break;
rewrite_line:
/* Rewrite the line with the selected history item */
/* change command */
command_len = load_string(state->history[state->cur_history] ?
state->history[state->cur_history] : "");
/* redraw and go to eol (bol, in vi) */
redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
break;
#endif
case KEYCODE_RIGHT:
input_forward();
break;
case KEYCODE_LEFT:
input_backward(1);
break;
case KEYCODE_CTRL_LEFT:
case KEYCODE_ALT_LEFT: /* bash doesn't do it */
ctrl_left();
break;
case KEYCODE_CTRL_RIGHT:
case KEYCODE_ALT_RIGHT: /* bash doesn't do it */
ctrl_right();
break;
case KEYCODE_HOME:
input_backward(cursor);
break;
case KEYCODE_END:
put_till_end_and_adv_cursor();
break;
default:
if (initial_settings.c_cc[VINTR] != 0
&& ic_raw == initial_settings.c_cc[VINTR]
) {
/* Ctrl-C (usually) - stop gathering input */
command_len = 0;
break_out = -1; /* "do not append '\n'" */
break;
}
if (initial_settings.c_cc[VEOF] != 0
&& ic_raw == initial_settings.c_cc[VEOF]
) {
/* Ctrl-D (usually) - delete one character,
* or exit if len=0 and no chars to delete */
if (command_len == 0) {
errno = 0;
case -1: /* error (e.g. EIO when tty is destroyed) */
IF_FEATURE_EDITING_VI(return_error_indicator:)
break_out = command_len = -1;
break;
}
input_delete(0);
break;
}
// /* Control-V -- force insert of next char */
// if (c == CTRL('V')) {
// if (safe_read(STDIN_FILENO, &c, 1) < 1)
// goto return_error_indicator;
// if (c == 0) {
// beep();
// break;
// }
// }
if (ic < ' '
|| (!ENABLE_UNICODE_SUPPORT && ic >= 256)
|| (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
) {
/* If VI_CMDMODE_BIT is set, ic is >= 256
* and vi mode ignores unexpected chars.
* Otherwise, we are here if ic is a
* control char or an unhandled ESC sequence,
* which is also ignored.
*/
break;
}
if ((int)command_len >= (maxsize - 2)) {
/* Not enough space for the char and EOL */
break;
}
command_len++;
if (cursor == (command_len - 1)) {
/* We are at the end, append */
command_ps[cursor] = ic;
command_ps[cursor + 1] = BB_NUL;
put_cur_glyph_and_inc_cursor();
if (unicode_bidi_isrtl(ic))
input_backward(1);
} else {
/* In the middle, insert */
int sc = cursor;
memmove(command_ps + sc + 1, command_ps + sc,
(command_len - sc) * sizeof(command_ps[0]));
command_ps[sc] = ic;
/* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
if (!isrtl_str())
sc++; /* no */
put_till_end_and_adv_cursor();
/* to prev x pos + 1 */
input_backward(cursor - sc);
}
break;
} /* switch (ic) */
if (break_out)
break;
#if ENABLE_FEATURE_TAB_COMPLETION
if (ic_raw != '\t')
lastWasTab = 0;
#endif
} /* while (1) */
#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
if (S.sent_ESC_br6n) {
/* "sleep 1; busybox ash" + hold [Enter] to trigger.
* We sent "ESC [ 6 n", but got '\n' first, and
* KEYCODE_CURSOR_POS response is now buffered from terminal.
* It's bad already and not much can be done with it
* (it _will_ be visible for the next process to read stdin),
* but without this delay it even shows up on the screen
* as garbage because we restore echo settings with tcsetattr
* before it comes in. UGLY!
*/
usleep(20*1000);
// MAYBE? tcflush(STDIN_FILENO, TCIFLUSH); /* flushes data received but not read */
}
#endif
/* End of bug-catching "command_must_not_be_used" trick */
#undef command
#if ENABLE_UNICODE_SUPPORT
command[0] = '\0';
if (command_len > 0)
command_len = save_string(command, maxsize - 1);
free(command_ps);
#endif
if (command_len > 0) {
remember_in_history(command);
}
if (break_out > 0) {
command[command_len++] = '\n';
command[command_len] = '\0';
}
#if ENABLE_FEATURE_TAB_COMPLETION
free_tab_completion_data();
#endif
/* restore initial_settings */
tcsetattr_stdin_TCSANOW(&initial_settings);
#if ENABLE_FEATURE_EDITING_WINCH
/* restore SIGWINCH handler */
sigaction_set(SIGWINCH, &S.SIGWINCH_handler);
#endif
fflush_all();
len = command_len;
DEINIT_S();
return len; /* can't return command_len, DEINIT_S() destroys it */
}
#else /* !FEATURE_EDITING */
#undef read_line_input
int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
{
fputs_stdout(prompt);
fflush_all();
if (!fgets(command, maxsize, stdin))
return -1;
return strlen(command);
}
#endif /* !FEATURE_EDITING */
/*
* Testing
*/
#ifdef TEST
#include <locale.h>
const char *applet_name = "debug stuff usage";
int main(int argc, char **argv)
{
char buff[MAX_LINELEN];
char *prompt =
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
"\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
"\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
"\\!\\[\\e[36;1m\\]\\$ \\[\\E[m\\]";
#else
"% ";
#endif
while (1) {
int l;
l = read_line_input(prompt, buff);
if (l <= 0 || buff[l-1] != '\n')
break;
buff[l-1] = '\0';
printf("*** read_line_input() returned line =%s=\n", buff);
}
printf("*** read_line_input() detect ^D\n");
return 0;
}
#endif /* TEST */
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