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busybox/libbb/lineedit.c
Tomas Heinrich d2b04050c0 lineedit: invalid unicode characters are replaced with CONFIG_SUBST_WCHAR 
function                                             old     new   delta
read_key_ungets                                        -      50     +50
lineedit_read_key                                    223     252     +29

Signed-off-by: Tomas Heinrich <heinrich.tomas@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-03-09 14:09:24 +01:00

2331 lines
56 KiB
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/* vi: set sw=4 ts=4: */
/*
* Termios command line History and 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:
* ESC-b -- Move back one word
* ESC-f -- Move forward one word
* ESC-d -- Delete forward one word
* 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 \$\[\033[00m\] '
*/
#include "libbb.h"
#include "unicode.h"
/* FIXME: obsolete CONFIG item? */
#define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
#ifdef TEST
# define ENABLE_FEATURE_EDITING 0
# define ENABLE_FEATURE_TAB_COMPLETION 0
# define ENABLE_FEATURE_USERNAME_COMPLETION 0
# define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
#endif
/* Entire file (except TESTing part) sits inside this #if */
#if ENABLE_FEATURE_EDITING
#define ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR \
(ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
#define IF_FEATURE_GETUSERNAME_AND_HOMEDIR(...)
#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
#undef IF_FEATURE_GETUSERNAME_AND_HOMEDIR
#define IF_FEATURE_GETUSERNAME_AND_HOMEDIR(...) __VA_ARGS__
#endif
#undef CHAR_T
#if ENABLE_FEATURE_ASSUME_UNICODE
# define BB_NUL L'\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(CHAR_T c) { return ((unsigned)c < 256 && isalnum(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)
# define BB_isalnum(c) isalnum(c)
# define BB_ispunct(c) ispunct(c)
#endif
enum {
/* We use int16_t for positions, need to limit line len */
MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
? CONFIG_FEATURE_EDITING_MAX_LEN
: 0x7ff0
};
#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
static const char null_str[] ALIGN1 = "";
#endif
/* We try to minimize both static and stack usage. */
struct lineedit_statics {
line_input_t *state;
volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
sighandler_t previous_SIGWINCH_handler;
unsigned cmdedit_x; /* real x (col) terminal position */
unsigned cmdedit_y; /* pseudoreal y (row) terminal position */
unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
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;
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
int num_ok_lines; /* = 1; */
#endif
#if ENABLE_FEATURE_GETUSERNAME_AND_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_VI
#define DELBUFSIZ 128
CHAR_T *delptr;
smallint newdelflag; /* whether delbuf should be reused yet */
CHAR_T delbuf[DELBUFSIZ]; /* a place to store deleted characters */
#endif
#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
smallint sent_ESC_br6n;
#endif
/* Formerly these were big buffers on stack: */
#if ENABLE_FEATURE_TAB_COMPLETION
char exe_n_cwd_tab_completion__dirbuf[MAX_LINELEN];
char input_tab__matchBuf[MAX_LINELEN];
int16_t find_match__int_buf[MAX_LINELEN + 1]; /* need to have 9 bits at least */
int16_t find_match__pos_buf[MAX_LINELEN + 1];
#endif
};
/* See lineedit_ptr_hack.c */
extern struct lineedit_statics *const lineedit_ptr_to_statics;
#define S (*lineedit_ptr_to_statics)
#define state (S.state )
#define cmdedit_termw (S.cmdedit_termw )
#define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
#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 num_ok_lines (S.num_ok_lines )
#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 { \
(*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
barrier(); \
cmdedit_termw = 80; \
IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
IF_FEATURE_GETUSERNAME_AND_HOMEDIR(home_pwd_buf = (char*)null_str;) \
} 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_FEATURE_GETUSERNAME_AND_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_FEATURE_ASSUME_UNICODE
static size_t load_string(const char *src, int maxsize)
{
ssize_t len = mbstowcs(command_ps, src, maxsize - 1);
if (len < 0)
len = 0;
command_ps[len] = L'\0';
return len;
}
static size_t save_string(char *dst, int maxsize)
{
ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
if (len < 0)
len = 0;
dst[len] = '\0';
return len;
}
/* I thought just fputwc(c, stdout) would work. But no... */
static void BB_PUTCHAR(wchar_t c)
{
char buf[MB_CUR_MAX + 1];
mbstate_t mbst = { 0 };
ssize_t len = wcrtomb(buf, c, &mbst);
if (len > 0) {
buf[len] = '\0';
fputs(buf, stdout);
}
}
#else
static size_t load_string(const char *src, int maxsize)
{
safe_strncpy(command_ps, src, maxsize);
return strlen(command_ps);
}
# if ENABLE_FEATURE_TAB_COMPLETION
static void save_string(char *dst, int maxsize)
{
safe_strncpy(dst, command_ps, maxsize);
}
# endif
# define BB_PUTCHAR(c) bb_putchar(c)
#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
#if HACK_FOR_WRONG_WIDTH
static void cmdedit_set_out_char(void)
#define cmdedit_set_out_char(next_char) cmdedit_set_out_char()
#else
static void cmdedit_set_out_char(int next_char)
#endif
{
CHAR_T c = command_ps[cursor];
if (c == BB_NUL) {
/* erase character after end of input string */
c = ' ';
}
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
/* Display non-printable characters in reverse */
if (!BB_isprint(c)) {
if (c >= 128)
c -= 128;
if (c < ' ')
c += '@';
if (c == 127)
c = '?';
printf("\033[7m%c\033[0m", c);
} else
#endif
{
BB_PUTCHAR(c);
}
if (++cmdedit_x >= cmdedit_termw) {
/* terminal is scrolled down */
cmdedit_y++;
cmdedit_x = 0;
#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
/* Works ok only if cmdedit_termw is correct */
/* destroy "(auto)margin" */
bb_putchar(next_char);
bb_putchar('\b');
#endif
}
// Huh? What if command_ps[cursor] == BB_NUL (we are at the end already?)
cursor++;
}
/* Move to end of line (by printing all chars till the end) */
static void input_end(void)
{
while (cursor < command_len)
cmdedit_set_out_char(' ');
}
/* Go to the next line */
static void goto_new_line(void)
{
input_end();
if (cmdedit_x)
bb_putchar('\n');
}
static void out1str(const char *s)
{
if (s)
fputs(s, stdout);
}
static void beep(void)
{
bb_putchar('\007');
}
/* Move back one character */
/* (optimized for slow terminals) */
static void input_backward(unsigned num)
{
int count_y;
if (num > cursor)
num = cursor;
if (!num)
return;
cursor -= num;
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("\033[%uD", num);
return;
}
/* Need to go one or more lines up */
num -= cmdedit_x;
{
unsigned w = cmdedit_termw; /* volatile var */
count_y = 1 + (num / w);
cmdedit_y -= count_y;
cmdedit_x = w * count_y - num;
}
/* go to 1st column; go up; go to correct column */
printf("\r" "\033[%dA" "\033[%dC", count_y, cmdedit_x);
}
static void put_prompt(void)
{
unsigned w;
out1str(cmdedit_prompt);
fflush_all();
cursor = 0;
w = cmdedit_termw; /* read volatile var once */
cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
cmdedit_x = cmdedit_prmt_len % w;
}
/* draw prompt, editor line, and clear tail */
static void redraw(int y, int back_cursor)
{
if (y > 0) /* up to start y */
printf("\033[%uA", y);
bb_putchar('\r');
put_prompt();
input_end(); /* rewrite */
printf("\033[J"); /* erase after cursor */
input_backward(back_cursor);
}
/* 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--;
input_end(); /* rewrite new line */
cmdedit_set_out_char(' '); /* erase char */
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;
input_end(); /* rewrite new line */
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)
cmdedit_set_out_char(command_ps[cursor + 1]);
}
#if ENABLE_FEATURE_TAB_COMPLETION
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)
{
matches = xrealloc_vector(matches, 4, num_matches);
matches[num_matches] = matched;
num_matches++;
}
#if ENABLE_FEATURE_USERNAME_COMPLETION
static void username_tab_completion(char *ud, char *with_shash_flg)
{
struct passwd *entry;
int userlen;
ud++; /* ~user/... to user/... */
userlen = strlen(ud);
if (with_shash_flg) { /* "~/..." or "~user/..." */
char *sav_ud = ud - 1;
char *home = NULL;
if (*ud == '/') { /* "~/..." */
home = home_pwd_buf;
} else {
/* "~user/..." */
char *temp;
temp = strchr(ud, '/');
*temp = '\0'; /* ~user\0 */
entry = getpwnam(ud);
*temp = '/'; /* restore ~user/... */
ud = temp;
if (entry)
home = entry->pw_dir;
}
if (home) {
if ((userlen + strlen(home) + 1) < MAX_LINELEN) {
/* /home/user/... */
sprintf(sav_ud, "%s%s", home, ud);
}
}
} else {
/* "~[^/]*" */
/* Using _r function to avoid pulling in static buffers */
char line_buff[256];
struct passwd pwd;
struct passwd *result;
setpwent();
while (!getpwent_r(&pwd, line_buff, sizeof(line_buff), &result)) {
/* Null usernames should result in all users as possible completions. */
if (/*!userlen || */ strncmp(ud, pwd.pw_name, userlen) == 0) {
add_match(xasprintf("~%s/", pwd.pw_name));
}
}
endpwent();
}
}
#endif /* FEATURE_COMMAND_USERNAME_COMPLETION */
enum {
FIND_EXE_ONLY = 0,
FIND_DIR_ONLY = 1,
FIND_FILE_ONLY = 2,
};
static int path_parse(char ***p, int flags)
{
int npth;
const char *pth;
char *tmp;
char **res;
/* if not setenv PATH variable, to search cur dir "." */
if (flags != FIND_EXE_ONLY)
return 1;
if (state->flags & WITH_PATH_LOOKUP)
pth = state->path_lookup;
else
pth = getenv("PATH");
/* PATH=<empty> or PATH=:<empty> */
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;
if (*++tmp == '\0')
break; /* :<empty> */
npth++;
}
res = xmalloc(npth * sizeof(char*));
res[0] = tmp = xstrdup(pth);
npth = 1;
while (1) {
tmp = strchr(tmp, ':');
if (!tmp)
break;
*tmp++ = '\0'; /* ':' -> '\0' */
if (*tmp == '\0')
break; /* :<empty> */
res[npth++] = tmp;
}
*p = res;
return npth;
}
static void exe_n_cwd_tab_completion(char *command, int type)
{
DIR *dir;
struct dirent *next;
struct stat st;
char *path1[1];
char **paths = path1;
int npaths;
int i;
char *found;
char *pfind = strrchr(command, '/');
/* char dirbuf[MAX_LINELEN]; */
#define dirbuf (S.exe_n_cwd_tab_completion__dirbuf)
npaths = 1;
path1[0] = (char*)".";
if (pfind == NULL) {
/* no dir, if flags==EXE_ONLY - get paths, else "." */
npaths = path_parse(&paths, type);
pfind = command;
} else {
/* dirbuf = ".../.../.../" */
safe_strncpy(dirbuf, command, (pfind - command) + 2);
#if ENABLE_FEATURE_USERNAME_COMPLETION
if (dirbuf[0] == '~') /* ~/... or ~user/... */
username_tab_completion(dirbuf, dirbuf);
#endif
paths[0] = dirbuf;
/* point to 'l' in "..../last_component" */
pfind++;
}
for (i = 0; i < npaths; i++) {
dir = opendir(paths[i]);
if (!dir)
continue; /* don't print an error */
while ((next = readdir(dir)) != NULL) {
int len1;
const char *str_found = next->d_name;
/* matched? */
if (strncmp(str_found, pfind, strlen(pfind)))
continue;
/* not see .name without .match */
if (*str_found == '.' && *pfind == '\0') {
if (NOT_LONE_CHAR(paths[i], '/') || str_found[1])
continue;
str_found = ""; /* only "/" */
}
found = concat_path_file(paths[i], str_found);
/* hmm, remove in progress? */
/* 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;
/* find with dirs? */
if (paths[i] != dirbuf)
strcpy(found, next->d_name); /* only name */
len1 = strlen(found);
found = xrealloc(found, len1 + 2);
found[len1] = '\0';
found[len1+1] = '\0';
if (S_ISDIR(st.st_mode)) {
/* name is a directory */
if (found[len1-1] != '/') {
found[len1] = '/';
}
} else {
/* not put found file if search only dirs for cd */
if (type == FIND_DIR_ONLY)
goto cont;
}
/* Add it to the list */
add_match(found);
continue;
cont:
free(found);
}
closedir(dir);
}
if (paths != path1) {
free(paths[0]); /* allocated memory is only in first member */
free(paths);
}
#undef dirbuf
}
/* 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)
#define int_buf (S.find_match__int_buf)
#define pos_buf (S.find_match__pos_buf)
/* is must be <= in */
static void collapse_pos(int is, int in)
{
memmove(int_buf+is, int_buf+in, (MAX_LINELEN+1-in)*sizeof(int_buf[0]));
memmove(pos_buf+is, pos_buf+in, (MAX_LINELEN+1-in)*sizeof(pos_buf[0]));
}
static NOINLINE int find_match(char *matchBuf, int *len_with_quotes)
{
int i, j;
int command_mode;
int c, c2;
/* Were local, but it uses too much stack */
/* int16_t int_buf[MAX_LINELEN + 1]; */
/* int16_t pos_buf[MAX_LINELEN + 1]; */
/* set to integer dimension characters and own positions */
for (i = 0;; i++) {
int_buf[i] = (unsigned char)matchBuf[i];
if (int_buf[i] == 0) {
pos_buf[i] = -1; /* end-fo-line indicator */
break;
}
pos_buf[i] = i;
}
/* mask \+symbol and convert '\t' to ' ' */
for (i = j = 0; matchBuf[i]; i++, j++)
if (matchBuf[i] == '\\') {
collapse_pos(j, j + 1);
int_buf[j] |= QUOT;
i++;
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
if (matchBuf[i] == '\t') /* algorithm equivalent */
int_buf[j] = ' ' | QUOT;
#endif
}
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
else if (matchBuf[i] == '\t')
int_buf[j] = ' ';
#endif
/* mask "symbols" or 'symbols' */
c2 = 0;
for (i = 0; int_buf[i]; i++) {
c = int_buf[i];
if (c == '\'' || c == '"') {
if (c2 == 0)
c2 = c;
else {
if (c == c2)
c2 = 0;
else
int_buf[i] |= QUOT;
}
} else if (c2 != 0 && c != '$')
int_buf[i] |= QUOT;
}
/* skip commands with arguments if line has commands delimiters */
/* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */
for (i = 0; int_buf[i]; i++) {
c = int_buf[i];
c2 = int_buf[i + 1];
j = i ? int_buf[i - 1] : -1;
command_mode = 0;
if (c == ';' || c == '&' || c == '|') {
command_mode = 1 + (c == c2);
if (c == '&') {
if (j == '>' || j == '<')
command_mode = 0;
} else if (c == '|' && j == '>')
command_mode = 0;
}
if (command_mode) {
collapse_pos(0, i + command_mode);
i = -1; /* hack incremet */
}
}
/* collapse `command...` */
for (i = 0; int_buf[i]; i++) {
if (int_buf[i] == '`') {
for (j = i + 1; int_buf[j]; j++)
if (int_buf[j] == '`') {
collapse_pos(i, j + 1);
j = 0;
break;
}
if (j) {
/* not found closing ` - command mode, collapse all previous */
collapse_pos(0, i + 1);
break;
} else
i--; /* hack incremet */
}
}
/* collapse (command...(command...)...) or {command...{command...}...} */
c = 0; /* "recursive" level */
c2 = 0;
for (i = 0; int_buf[i]; i++) {
if (int_buf[i] == '(' || int_buf[i] == '{') {
if (int_buf[i] == '(')
c++;
else
c2++;
collapse_pos(0, i + 1);
i = -1; /* hack incremet */
}
}
for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++) {
if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) {
if (int_buf[i] == ')')
c--;
else
c2--;
collapse_pos(0, i + 1);
i = -1; /* hack incremet */
}
}
/* skip first not quote space */
for (i = 0; int_buf[i]; i++)
if (int_buf[i] != ' ')
break;
if (i)
collapse_pos(0, i);
/* set find mode for completion */
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
&& matchBuf[pos_buf[0]] == 'c'
&& matchBuf[pos_buf[1]] == 'd'
) {
command_mode = FIND_DIR_ONLY;
} else {
command_mode = FIND_FILE_ONLY;
break;
}
}
}
for (i = 0; int_buf[i]; i++)
/* "strlen" */;
/* find last word */
for (--i; i >= 0; i--) {
c = int_buf[i];
if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') {
collapse_pos(0, i + 1);
break;
}
}
/* skip first not quoted '\'' or '"' */
for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++)
/*skip*/;
/* collapse quote or unquote // or /~ */
while ((int_buf[i] & ~QUOT) == '/'
&& ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~')
) {
i++;
}
/* set only match and destroy quotes */
j = 0;
for (c = 0; pos_buf[i] >= 0; i++) {
matchBuf[c++] = matchBuf[pos_buf[i]];
j = pos_buf[i] + 1;
}
matchBuf[c] = '\0';
/* old length matchBuf with quotes symbols */
*len_with_quotes = j ? j - pos_buf[0] : 0;
return command_mode;
}
#undef int_buf
#undef pos_buf
/*
* display by column (original idea from ls applet,
* very optimized by me :)
*/
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_strlen(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_strlen(matches[n])), ""
);
}
puts(matches[n]);
}
}
static char *add_quote_for_spec_chars(char *found)
{
int l = 0;
char *s = xzalloc((strlen(found) + 1) * 2);
while (*found) {
if (strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", *found))
s[l++] = '\\';
s[l++] = *found++;
}
/* s[l] = '\0'; - already is */
return s;
}
/* Do TAB completion */
static void input_tab(smallint *lastWasTab)
{
if (!(state->flags & TAB_COMPLETION))
return;
if (!*lastWasTab) {
char *tmp, *tmp1;
size_t len_found;
/* char matchBuf[MAX_LINELEN]; */
#define matchBuf (S.input_tab__matchBuf)
int find_type;
int recalc_pos;
#if ENABLE_FEATURE_ASSUME_UNICODE
/* cursor pos in command converted to multibyte form */
int cursor_mb;
#endif
*lastWasTab = TRUE; /* flop trigger */
/* Make a local copy of the string --
* up to the position of the cursor */
save_string(matchBuf, cursor + 1);
#if ENABLE_FEATURE_ASSUME_UNICODE
cursor_mb = strlen(matchBuf);
#endif
tmp = matchBuf;
find_type = find_match(matchBuf, &recalc_pos);
/* 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 (matchBuf[0] == '~' && strchr(matchBuf, '/') == NULL)
username_tab_completion(matchBuf, NULL);
#endif
/* Try to match any executable in our path and everything
* in the current working directory */
if (!matches)
exe_n_cwd_tab_completion(matchBuf, find_type);
/* Sort, then remove any duplicates found */
if (matches) {
unsigned i;
int 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 + 1;
}
/* Did we find exactly one match? */
if (!matches || num_matches > 1) { /* no */
beep();
if (!matches)
return; /* not found */
/* find minimal match */
tmp1 = xstrdup(matches[0]);
for (tmp = tmp1; *tmp; tmp++) {
for (len_found = 1; len_found < num_matches; len_found++) {
if (matches[len_found][tmp - tmp1] != *tmp) {
*tmp = '\0';
break;
}
}
}
if (*tmp1 == '\0') { /* have unique */
free(tmp1);
return;
}
tmp = add_quote_for_spec_chars(tmp1);
free(tmp1);
} else { /* one match */
tmp = add_quote_for_spec_chars(matches[0]);
/* for next completion current found */
*lastWasTab = FALSE;
len_found = strlen(tmp);
if (tmp[len_found-1] != '/') {
tmp[len_found] = ' ';
tmp[len_found+1] = '\0';
}
}
len_found = strlen(tmp);
#if !ENABLE_FEATURE_ASSUME_UNICODE
/* have space to place the match? */
/* The result consists of three parts with these lengths: */
/* (cursor - recalc_pos) + len_found + (command_len - cursor) */
/* it simplifies into: */
if ((int)(len_found + command_len - recalc_pos) < S.maxsize) {
/* save tail */
strcpy(matchBuf, command_ps + cursor);
/* add match and tail */
sprintf(&command_ps[cursor - recalc_pos], "%s%s", tmp, matchBuf);
command_len = strlen(command_ps);
/* new pos */
recalc_pos = cursor - recalc_pos + len_found;
/* write out the matched command */
redraw(cmdedit_y, command_len - recalc_pos);
}
#else
{
char command[MAX_LINELEN];
int len = save_string(command, sizeof(command));
/* have space to place the match? */
/* (cursor_mb - recalc_pos) + len_found + (len - cursor_mb) */
if ((int)(len_found + len - recalc_pos) < MAX_LINELEN) {
/* save tail */
strcpy(matchBuf, command + cursor_mb);
/* where do we want to have cursor after all? */
strcpy(&command[cursor_mb - recalc_pos], tmp);
len = load_string(command, S.maxsize);
/* add match and tail */
sprintf(&command[cursor_mb - recalc_pos], "%s%s", tmp, matchBuf);
command_len = load_string(command, S.maxsize);
/* write out the matched command */
redraw(cmdedit_y, command_len - len);
}
}
#endif
free(tmp);
#undef matchBuf
} else {
/* Ok -- the last char was a TAB. Since they
* just hit TAB again, print a list of all the
* available choices... */
if (matches && num_matches > 0) {
/* changed by goto_new_line() */
int sav_cursor = cursor;
/* Go to the next line */
goto_new_line();
showfiles();
redraw(0, command_len - sav_cursor);
}
}
}
#endif /* FEATURE_COMMAND_TAB_COMPLETION */
line_input_t* FAST_FUNC new_line_input_t(int flags)
{
line_input_t *n = xzalloc(sizeof(*n));
n->flags = flags;
return n;
}
#if MAX_HISTORY > 0
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_FEATURE_ASSUME_UNICODE
{
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;
}
# 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.
*/
static void free_line_input_t(line_input_t *n)
{
int i = n->cnt_history;
while (i > 0)
free(n->history[--i]);
free(n);
}
/* 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));
st_parm->cnt_history_in_file = idx = 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 == 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 == MAX_HISTORY)
idx = 0;
}
}
/* copy temp_h[] to st_parm->history[] */
for (i = 0; i < MAX_HISTORY;) {
line = temp_h[idx];
if (!line)
break;
idx++;
if (idx == 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;
}
}
/* state->flags is already checked to be nonzero */
static void save_history(char *str)
{
int fd;
int len, len2;
fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0666);
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 > MAX_HISTORY * 4) {
FILE *fp;
char *new_name;
line_input_t *st_temp;
int i;
/* 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;
load_history(st_temp);
/* write out temp file and replace hist_file atomically */
new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
fp = fopen_for_write(new_name);
if (fp) {
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);
}
}
# 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[MAX_HISTORY]); /* redundant, paranoia */
state->history[MAX_HISTORY] = NULL; /* redundant, paranoia */
/* If history[] is full, remove the oldest command */
/* we need to keep history[MAX_HISTORY] empty, hence >=, not > */
if (i >= MAX_HISTORY) {
free(state->history[0]);
for (i = 0; i < MAX_HISTORY-1; i++)
state->history[i] = state->history[i+1];
/* i == MAX_HISTORY-1 */
}
/* i <= MAX_HISTORY-1 */
state->history[i++] = xstrdup(str);
/* i <= MAX_HISTORY */
state->cur_history = i;
state->cnt_history = i;
# if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
if ((state->flags & SAVE_HISTORY) && state->hist_file)
save_history(str);
# endif
IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
}
#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(command[cursor]) || command[cursor] == '_') {
while (cursor < command_len
&& (BB_isalnum(command[cursor+1]) || 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(command[cursor]) || command[cursor] == '_') {
while (cursor < command_len-1
&& (BB_isalnum(command[cursor+1]) || 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(command[cursor]) || command[cursor] == '_') {
while (cursor > 0
&& (BB_isalnum(command[cursor-1]) || command[cursor-1] == '_')
) {
input_backward(1);
}
} else if (BB_ispunct(command[cursor])) {
while (cursor > 0 && BB_ispunct(command[cursor-1]))
input_backward(1);
}
}
#endif
/* 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, 4294967295) = 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;
out1str("\033" "[6n");
fflush_all(); /* make terminal see it ASAP! */
}
}
#else
#define ask_terminal() ((void)0)
#endif
#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
static void parse_and_put_prompt(const char *prmt_ptr)
{
cmdedit_prompt = prmt_ptr;
cmdedit_prmt_len = strlen(prmt_ptr);
put_prompt();
}
#else
static void parse_and_put_prompt(const char *prmt_ptr)
{
int prmt_len = 0;
size_t cur_prmt_len = 0;
char flg_not_length = '[';
char *prmt_mem_ptr = xzalloc(1);
char *cwd_buf = xrealloc_getcwd_or_warn(NULL);
char cbuf[2];
char c;
char *pbuf;
cmdedit_prmt_len = 0;
if (!cwd_buf) {
cwd_buf = (char *)bb_msg_unknown;
}
cbuf[1] = '\0'; /* never changes */
while (*prmt_ptr) {
char *free_me = NULL;
pbuf = cbuf;
c = *prmt_ptr++;
if (c == '\\') {
const char *cp = prmt_ptr;
int l;
c = bb_process_escape_sequence(&prmt_ptr);
if (prmt_ptr == cp) {
if (*cp == '\0')
break;
c = *prmt_ptr++;
switch (c) {
# if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
case 'u':
pbuf = user_buf ? user_buf : (char*)"";
break;
# endif
case 'h':
pbuf = free_me = safe_gethostname();
*strchrnul(pbuf, '.') = '\0';
break;
case '$':
c = (geteuid() == 0 ? '#' : '$');
break;
# if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
case 'w':
/* /home/user[/something] -> ~[/something] */
pbuf = cwd_buf;
l = strlen(home_pwd_buf);
if (l != 0
&& strncmp(home_pwd_buf, cwd_buf, l) == 0
&& (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
&& strlen(cwd_buf + l) < PATH_MAX
) {
pbuf = free_me = xasprintf("~%s", cwd_buf + l);
}
break;
# endif
case 'W':
pbuf = cwd_buf;
cp = strrchr(pbuf, '/');
if (cp != NULL && cp != pbuf)
pbuf += (cp-pbuf) + 1;
break;
case '!':
pbuf = free_me = xasprintf("%d", num_ok_lines);
break;
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) {
flg_not_length = (flg_not_length == '[' ? ']' : '[');
continue;
}
break;
} /* switch */
} /* if */
} /* if */
cbuf[0] = c;
cur_prmt_len = strlen(pbuf);
prmt_len += cur_prmt_len;
if (flg_not_length != ']')
cmdedit_prmt_len += cur_prmt_len;
prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
free(free_me);
} /* while */
if (cwd_buf != (char *)bb_msg_unknown)
free(cwd_buf);
cmdedit_prompt = prmt_mem_ptr;
put_prompt();
}
#endif
static void cmdedit_setwidth(unsigned w, int redraw_flg)
{
cmdedit_termw = w;
if (redraw_flg) {
/* new y for current cursor */
int new_y = (cursor + cmdedit_prmt_len) / w;
/* redraw */
redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
fflush_all();
}
}
static void win_changed(int nsig)
{
unsigned width;
get_terminal_width_height(0, &width, NULL);
cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
if (nsig == SIGWINCH)
signal(SIGWINCH, win_changed); /* rearm ourself */
}
static int lineedit_read_key(char *read_key_buffer)
{
int64_t ic;
struct pollfd pfd;
int delay = -1;
#if ENABLE_FEATURE_ASSUME_UNICODE
char unicode_buf[MB_CUR_MAX + 1];
int unicode_idx = 0;
#endif
pfd.fd = STDIN_FILENO;
pfd.events = POLLIN;
do {
#if ENABLE_FEATURE_EDITING_ASK_TERMINAL || ENABLE_FEATURE_ASSUME_UNICODE
poll_again:
#endif
if (read_key_buffer[0] == 0) {
/* Wait for input. Can't just call read_key,
* it returns at once if stdin
* is in non-blocking mode. */
safe_poll(&pfd, 1, delay);
}
/* Note: read_key sets errno to 0 on success: */
ic = read_key(STDIN_FILENO, read_key_buffer);
#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;
if (col > cmdedit_prmt_len) {
cmdedit_x += (col - cmdedit_prmt_len);
while (cmdedit_x >= cmdedit_termw) {
cmdedit_x -= cmdedit_termw;
cmdedit_y++;
}
}
}
goto poll_again;
}
#endif
#if ENABLE_FEATURE_ASSUME_UNICODE
if (unicode_status == UNICODE_ON) {
wchar_t wc;
if ((int32_t)ic < 0) /* KEYCODE_xxx */
return ic;
// 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) {
delay = 50;
goto poll_again;
}
/* Invalid sequence. Save all "bad bytes" except first */
read_key_ungets(read_key_buffer, unicode_buf + 1, MB_CUR_MAX - 1);
/*
* ic = unicode_buf[0] sounds even better, but currently
* this does not work: wchar_t[] -> char[] conversion
* when lineedit finishes mangles such "raw bytes"
* (by misinterpreting them as unicode chars):
*/
ic = CONFIG_SUBST_WCHAR;
} else {
/* Valid unicode char, return its code */
ic = wc;
}
}
#endif
} while (errno == EAGAIN);
return ic;
}
/* 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)
/* 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'),
* >0 length of input string, including terminating '\n'
*/
int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, line_input_t *st)
{
int len;
#if ENABLE_FEATURE_TAB_COMPLETION
smallint lastWasTab = FALSE;
#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();
if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
|| !(initial_settings.c_lflag & ECHO)
) {
/* Happens when e.g. stty -echo was run before */
parse_and_put_prompt(prompt);
/* fflush_all(); - done by parse_and_put_prompt */
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;
/* With null flags, no other fields are ever used */
state = st ? st : (line_input_t*) &const_int_0;
#if MAX_HISTORY > 0
# if ENABLE_FEATURE_EDITING_SAVEHISTORY
if ((state->flags & SAVE_HISTORY) && state->hist_file)
if (state->cnt_history == 0)
load_history(state);
# endif
if (state->flags & DO_HISTORY)
state->cur_history = state->cnt_history;
#endif
/* prepare before init handlers */
cmdedit_y = 0; /* quasireal y, not true if line > xt*yt */
command_len = 0;
#if ENABLE_FEATURE_ASSUME_UNICODE
command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
#else
command_ps = command;
command[0] = '\0';
#endif
#define command command_must_not_be_used
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);
/* Hmm, in linux c_cc[] is not parsed if ICANON is off */
new_settings.c_cc[VMIN] = 1;
new_settings.c_cc[VTIME] = 0;
/* Turn off CTRL-C, so we can trap it */
#ifndef _POSIX_VDISABLE
# define _POSIX_VDISABLE '\0'
#endif
new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
tcsetattr_stdin_TCSANOW(&new_settings);
/* Now initialize things */
previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
win_changed(0); /* do initial resizing */
#if ENABLE_FEATURE_GETUSERNAME_AND_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 <= 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
/* Print out the command prompt, optionally ask where cursor is */
parse_and_put_prompt(prompt);
ask_terminal();
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.
*/
enum {
VI_CMDMODE_BIT = 0x40000000,
/* 0x80000000 bit flags KEYCODE_xxx */
};
int32_t ic, ic_raw;
fflush_all();
ic = ic_raw = lineedit_read_key(read_key_buffer);
#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:)
vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
/* Control-b -- Move back one character */
input_backward(1);
break;
case CTRL('E'):
vi_case('$'|VI_CMDMODE_BIT:)
/* Control-e -- End of line */
input_end();
break;
case CTRL('F'):
vi_case('l'|VI_CMDMODE_BIT:)
vi_case(' '|VI_CMDMODE_BIT:)
/* Control-f -- Move forward one character */
input_forward();
break;
case '\b':
case '\x7f': /* DEL */
/* Control-h and DEL */
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("\033[J");
break;
case CTRL('L'):
vi_case(CTRL('L')|VI_CMDMODE_BIT:)
/* Control-l -- clear screen */
printf("\033[H");
redraw(0, 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;
#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:
input_end();
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);
if (errno) /* error */
goto prepare_to_die;
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);
if (errno) /* error */
goto prepare_to_die;
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] : "", maxsize);
/* 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:
ctrl_left();
break;
case KEYCODE_CTRL_RIGHT:
ctrl_right();
break;
case KEYCODE_DELETE:
input_delete(0);
break;
case KEYCODE_HOME:
input_backward(cursor);
break;
case KEYCODE_END:
input_end();
break;
default:
if (initial_settings.c_cc[VINTR] != 0
&& ic_raw == initial_settings.c_cc[VINTR]
) {
/* Ctrl-C (usually) - stop gathering input */
goto_new_line();
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;
#if ENABLE_FEATURE_EDITING_VI
prepare_to_die:
#endif
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 prepare_to_die;
// if (c == 0) {
// beep();
// break;
// }
// }
if (ic < ' '
|| (!ENABLE_FEATURE_ASSUME_UNICODE && ic >= 256)
|| (ENABLE_FEATURE_ASSUME_UNICODE && 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;
cmdedit_set_out_char(' ');
} 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;
sc++;
/* rewrite from cursor */
input_end();
/* 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 = FALSE;
#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);
}
#endif
/* Stop bug catching using "command_must_not_be_used" trick */
#undef command
#if ENABLE_FEATURE_ASSUME_UNICODE
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);
/* restore SIGWINCH handler */
signal(SIGWINCH, previous_SIGWINCH_handler);
fflush_all();
len = command_len;
DEINIT_S();
return len; /* can't return command_len, DEINIT_S() destroys it */
}
#else
#undef read_line_input
int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
{
fputs(prompt, stdout);
fflush_all();
fgets(command, maxsize, stdin);
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[0m\\]";
#else
"% ";
#endif
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
setlocale(LC_ALL, "");
#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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