busybox/libbb/lineedit.c
Denis Vlasenko c0ea82a457 libbb: revent previous version of "concurrent history updating"
and replace it with one which does not "snoop" history written
by others. (1) it is what bug 185 needs, and (2) it is less bloaty:

function                                             old     new   delta
load_history                                           -     252    +252
read_line_input                                     3155    3287    +132
next_token                                           914     918      +4
qrealloc                                              36      33      -3
getoptscmd                                           713     708      -5
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 2/2 up/down: 388/-8)            Total: 380 bytes
2009-03-23 06:33:37 +00:00

2007 lines
48 KiB
C

/* 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, and more will probably
* need 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.
*
* 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"
/* 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 /* TEST */
/* Entire file (except TESTing part) sits inside this #if */
#if ENABLE_FEATURE_EDITING
#if ENABLE_LOCALE_SUPPORT
#define Isprint(c) isprint(c)
#else
#define Isprint(c) ((c) >= ' ' && (c) != ((unsigned char)'\233'))
#endif
#define ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR \
(ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
#define USE_FEATURE_GETUSERNAME_AND_HOMEDIR(...)
#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
#undef USE_FEATURE_GETUSERNAME_AND_HOMEDIR
#define USE_FEATURE_GETUSERNAME_AND_HOMEDIR(...) __VA_ARGS__
#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 terminal position */
unsigned cmdedit_y; /* pseudoreal y terminal position */
unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
unsigned cursor;
unsigned command_len;
char *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 *delptr;
smallint newdelflag; /* whether delbuf should be reused yet */
char delbuf[DELBUFSIZ]; /* a place to store deleted characters */
#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; \
USE_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
USE_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()
/* 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
{
int c = (unsigned char)command_ps[cursor];
if (c == '\0') {
/* erase character after end of input string */
c = ' ';
}
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
/* Display non-printable characters in reverse */
if (!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] == '\0' (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)
{
out1str(cmdedit_prompt);
cursor = 0;
{
unsigned w = cmdedit_termw; /* volatile var */
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[%dA", 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
overlapping_strcpy(command_ps + j, command_ps + j + 1);
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);
strncpy(command_ps + cursor, delbuf, j);
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
}
#define QUOT (UCHAR_MAX+1)
#define collapse_pos(is, in) do { \
memmove(int_buf+(is), int_buf+(in), (MAX_LINELEN+1-(is)-(in)) * sizeof(pos_buf[0])); \
memmove(pos_buf+(is), pos_buf+(in), (MAX_LINELEN+1-(is)-(in)) * sizeof(pos_buf[0])); \
} while (0)
static int find_match(char *matchBuf, int *len_with_quotes)
{
int i, j;
int command_mode;
int c, c2;
/* int16_t int_buf[MAX_LINELEN + 1]; */
/* int16_t pos_buf[MAX_LINELEN + 1]; */
#define int_buf (S.find_match__int_buf)
#define pos_buf (S.find_match__pos_buf)
/* 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; /* indicator end line */
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 close ` - 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 = 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 - strlen(matches[n])), "");
}
puts(matches[n]);
}
}
static char *add_quote_for_spec_chars(char *found)
{
int l = 0;
char *s = xmalloc((strlen(found) + 1) * 2);
while (*found) {
if (strchr(" `\"#$%^&*()=+{}[]:;\'|\\<>", *found))
s[l++] = '\\';
s[l++] = *found++;
}
s[l] = 0;
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;
*lastWasTab = TRUE; /* flop trigger */
/* Make a local copy of the string -- up
* to the position of the cursor */
tmp = strncpy(matchBuf, command_ps, cursor);
tmp[cursor] = '\0';
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, '/') == 0)
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) {
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);
/* have space to placed match? */
if ((len_found - strlen(matchBuf) + command_len) < MAX_LINELEN) {
/* before word for match */
command_ps[cursor - recalc_pos] = '\0';
/* save tail line */
strcpy(matchBuf, command_ps + cursor);
/* add match */
strcat(command_ps, tmp);
/* add tail */
strcat(command_ps, matchBuf);
/* back to begin word for match */
input_backward(recalc_pos);
/* new pos */
recalc_pos = cursor + len_found;
/* new len */
command_len = strlen(command_ps);
/* write out the matched command */
redraw(cmdedit_y, command_len - recalc_pos);
}
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) {
int sav_cursor = cursor; /* change goto_new_line() */
/* 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] != '\0') {
int cur = state->cur_history;
free(state->history[cur]);
state->history[cur] = xstrdup(command_ps);
}
}
/* 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 ENABLE_FEATURE_EDITING_SAVEHISTORY
if ((state->flags & SAVE_HISTORY) && state->hist_file)
save_history(str);
#endif
USE_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
}
#else /* MAX_HISTORY == 0 */
#define remember_in_history(a) ((void)0)
#endif /* MAX_HISTORY */
/*
* This function is used to grab a character buffer
* from the input file descriptor and allows you to
* a string with full command editing (sort of like
* a mini readline).
*
* The following standard commands are not implemented:
* ESC-b -- Move back one word
* ESC-f -- Move forward one word
* ESC-d -- Delete back one word
* ESC-h -- Delete forward one word
* CTL-t -- Transpose two characters
*
* Minimalist vi-style command line editing available if configured.
* vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
*/
#if ENABLE_FEATURE_EDITING_VI
static void
vi_Word_motion(char *command, int eat)
{
while (cursor < command_len && !isspace(command[cursor]))
input_forward();
if (eat) while (cursor < command_len && isspace(command[cursor]))
input_forward();
}
static void
vi_word_motion(char *command, int eat)
{
if (isalnum(command[cursor]) || command[cursor] == '_') {
while (cursor < command_len
&& (isalnum(command[cursor+1]) || command[cursor+1] == '_'))
input_forward();
} else if (ispunct(command[cursor])) {
while (cursor < command_len && ispunct(command[cursor+1]))
input_forward();
}
if (cursor < command_len)
input_forward();
if (eat && cursor < command_len && isspace(command[cursor]))
while (cursor < command_len && isspace(command[cursor]))
input_forward();
}
static void
vi_End_motion(char *command)
{
input_forward();
while (cursor < command_len && isspace(command[cursor]))
input_forward();
while (cursor < command_len-1 && !isspace(command[cursor+1]))
input_forward();
}
static void
vi_end_motion(char *command)
{
if (cursor >= command_len-1)
return;
input_forward();
while (cursor < command_len-1 && isspace(command[cursor]))
input_forward();
if (cursor >= command_len-1)
return;
if (isalnum(command[cursor]) || command[cursor] == '_') {
while (cursor < command_len-1
&& (isalnum(command[cursor+1]) || command[cursor+1] == '_')
) {
input_forward();
}
} else if (ispunct(command[cursor])) {
while (cursor < command_len-1 && ispunct(command[cursor+1]))
input_forward();
}
}
static void
vi_Back_motion(char *command)
{
while (cursor > 0 && isspace(command[cursor-1]))
input_backward(1);
while (cursor > 0 && !isspace(command[cursor-1]))
input_backward(1);
}
static void
vi_back_motion(char *command)
{
if (cursor <= 0)
return;
input_backward(1);
while (cursor > 0 && isspace(command[cursor]))
input_backward(1);
if (cursor <= 0)
return;
if (isalnum(command[cursor]) || command[cursor] == '_') {
while (cursor > 0
&& (isalnum(command[cursor-1]) || command[cursor-1] == '_')
) {
input_backward(1);
}
} else if (ispunct(command[cursor])) {
while (cursor > 0 && ispunct(command[cursor-1]))
input_backward(1);
}
}
#endif
/*
* read_line_input and its helpers
*/
#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(stdout);
}
}
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 */
}
/*
* 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.
*/
#define vbit 0x100
/* leave out the "vi-mode"-only case labels if vi editing isn't
* configured. */
#define vi_case(caselabel) USE_FEATURE_EDITING(case caselabel)
/* convert uppercase ascii to equivalent control char, for readability */
#undef CTRL
#define CTRL(a) ((a) & ~0x40)
/* 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
unsigned ic;
unsigned char c;
smallint break_out = 0;
#if ENABLE_FEATURE_EDITING_VI
smallint vi_cmdmode = 0;
smalluint prevc;
#endif
struct termios initial_settings;
struct termios new_settings;
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(stdout);
if (fgets(command, maxsize, stdin) == NULL)
len = -1; /* EOF or error */
else
len = strlen(command);
DEINIT_S();
return len;
}
// FIXME: audit & improve this
if (maxsize > MAX_LINELEN)
maxsize = MAX_LINELEN;
/* With null flags, no other fields are ever used */
state = st ? st : (line_input_t*) &const_int_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;
/* prepare before init handlers */
cmdedit_y = 0; /* quasireal y, not true if line > xt*yt */
command_len = 0;
command_ps = command;
command[0] = '\0';
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 (ic = 0; ic <= MAX_HISTORY; ic++)
bb_error_msg("history[%d]:'%s'", ic, state->history[ic]);
bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
#endif
/* Print out the command prompt */
parse_and_put_prompt(prompt);
while (1) {
fflush(NULL);
if (nonblock_safe_read(STDIN_FILENO, &c, 1) < 1) {
/* if we can't read input then exit */
goto prepare_to_die;
}
ic = c;
#if ENABLE_FEATURE_EDITING_VI
newdelflag = 1;
if (vi_cmdmode)
ic |= vbit;
#endif
switch (ic) {
case '\n':
case '\r':
vi_case('\n'|vbit:)
vi_case('\r'|vbit:)
/* Enter */
goto_new_line();
break_out = 1;
break;
case CTRL('A'):
vi_case('0'|vbit:)
/* Control-a -- Beginning of line */
input_backward(cursor);
break;
case CTRL('B'):
vi_case('h'|vbit:)
vi_case('\b'|vbit:)
vi_case('\x7f'|vbit:) /* DEL */
/* Control-b -- Move back one character */
input_backward(1);
break;
case CTRL('C'):
vi_case(CTRL('C')|vbit:)
/* Control-c -- stop gathering input */
goto_new_line();
command_len = 0;
break_out = -1; /* "do not append '\n'" */
break;
case CTRL('D'):
/* Control-d -- Delete one character, or exit
* if the len=0 and no chars to delete */
if (command_len == 0) {
errno = 0;
prepare_to_die:
/* to control stopped jobs */
break_out = command_len = -1;
break;
}
input_delete(0);
break;
case CTRL('E'):
vi_case('$'|vbit:)
/* Control-e -- End of line */
input_end();
break;
case CTRL('F'):
vi_case('l'|vbit:)
vi_case(' '|vbit:)
/* 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[cursor] = 0;
command_len = cursor;
printf("\033[J");
break;
case CTRL('L'):
vi_case(CTRL('L')|vbit:)
/* Control-l -- clear screen */
printf("\033[H");
redraw(0, command_len - cursor);
break;
#if MAX_HISTORY > 0
case CTRL('N'):
vi_case(CTRL('N')|vbit:)
vi_case('j'|vbit:)
/* Control-n -- Get next command in history */
if (get_next_history())
goto rewrite_line;
break;
case CTRL('P'):
vi_case(CTRL('P')|vbit:)
vi_case('k'|vbit:)
/* Control-p -- Get previous command from history */
if (get_previous_history())
goto rewrite_line;
break;
#endif
case CTRL('U'):
vi_case(CTRL('U')|vbit:)
/* Control-U -- Clear line before cursor */
if (cursor) {
overlapping_strcpy(command, command + cursor);
command_len -= cursor;
redraw(cmdedit_y, command_len);
}
break;
case CTRL('W'):
vi_case(CTRL('W')|vbit:)
/* Control-W -- Remove the last word */
while (cursor > 0 && isspace(command[cursor-1]))
input_backspace();
while (cursor > 0 && !isspace(command[cursor-1]))
input_backspace();
break;
#if ENABLE_FEATURE_EDITING_VI
case 'i'|vbit:
vi_cmdmode = 0;
break;
case 'I'|vbit:
input_backward(cursor);
vi_cmdmode = 0;
break;
case 'a'|vbit:
input_forward();
vi_cmdmode = 0;
break;
case 'A'|vbit:
input_end();
vi_cmdmode = 0;
break;
case 'x'|vbit:
input_delete(1);
break;
case 'X'|vbit:
if (cursor > 0) {
input_backward(1);
input_delete(1);
}
break;
case 'W'|vbit:
vi_Word_motion(command, 1);
break;
case 'w'|vbit:
vi_word_motion(command, 1);
break;
case 'E'|vbit:
vi_End_motion(command);
break;
case 'e'|vbit:
vi_end_motion(command);
break;
case 'B'|vbit:
vi_Back_motion(command);
break;
case 'b'|vbit:
vi_back_motion(command);
break;
case 'C'|vbit:
vi_cmdmode = 0;
/* fall through */
case 'D'|vbit:
goto clear_to_eol;
case 'c'|vbit:
vi_cmdmode = 0;
/* fall through */
case 'd'|vbit: {
int nc, sc;
sc = cursor;
prevc = ic;
if (safe_read(STDIN_FILENO, &c, 1) < 1)
goto prepare_to_die;
if (c == (prevc & 0xff)) {
/* "cc", "dd" */
input_backward(cursor);
goto clear_to_eol;
break;
}
switch (c) {
case 'w':
case 'W':
case 'e':
case 'E':
switch (c) {
case 'w': /* "dw", "cw" */
vi_word_motion(command, vi_cmdmode);
break;
case 'W': /* 'dW', 'cW' */
vi_Word_motion(command, vi_cmdmode);
break;
case 'e': /* 'de', 'ce' */
vi_end_motion(command);
input_forward();
break;
case 'E': /* 'dE', 'cE' */
vi_End_motion(command);
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 (c == 'b')
vi_back_motion(command);
else
vi_Back_motion(command);
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'|vbit:
input_forward();
/* fallthrough */
case 'P'|vbit:
put();
break;
case 'r'|vbit:
if (safe_read(STDIN_FILENO, &c, 1) < 1)
goto prepare_to_die;
if (c == 0)
beep();
else {
*(command + cursor) = c;
bb_putchar(c);
bb_putchar('\b');
}
break;
#endif /* FEATURE_COMMAND_EDITING_VI */
case '\x1b': /* ESC */
#if ENABLE_FEATURE_EDITING_VI
if (state->flags & VI_MODE) {
/* ESC: insert mode --> command mode */
vi_cmdmode = 1;
input_backward(1);
break;
}
#endif
/* escape sequence follows */
if (safe_read(STDIN_FILENO, &c, 1) < 1)
goto prepare_to_die;
/* different vt100 emulations */
if (c == '[' || c == 'O') {
vi_case('['|vbit:)
vi_case('O'|vbit:)
if (safe_read(STDIN_FILENO, &c, 1) < 1)
goto prepare_to_die;
}
if (c >= '1' && c <= '9') {
unsigned char dummy;
if (safe_read(STDIN_FILENO, &dummy, 1) < 1)
goto prepare_to_die;
if (dummy != '~')
c = '\0';
}
switch (c) {
#if ENABLE_FEATURE_TAB_COMPLETION
case '\t': /* Alt-Tab */
input_tab(&lastWasTab);
break;
#endif
#if MAX_HISTORY > 0
case 'A':
/* Up Arrow -- Get previous command from history */
if (get_previous_history())
goto rewrite_line;
beep();
break;
case 'B':
/* Down Arrow -- Get next command in history */
if (!get_next_history())
break;
rewrite_line:
/* Rewrite the line with the selected history item */
/* change command */
command_len = strlen(strcpy(command, 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 'C':
/* Right Arrow -- Move forward one character */
input_forward();
break;
case 'D':
/* Left Arrow -- Move back one character */
input_backward(1);
break;
case '3':
/* Delete */
input_delete(0);
break;
case '1': // vt100? linux vt? or what?
case '7': // vt100? linux vt? or what?
case 'H': /* xterm's <Home> */
input_backward(cursor);
break;
case '4': // vt100? linux vt? or what?
case '8': // vt100? linux vt? or what?
case 'F': /* xterm's <End> */
input_end();
break;
default:
c = '\0';
beep();
}
break;
default: /* If it's regular input, do the normal thing */
/* 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 ENABLE_FEATURE_EDITING_VI
if (vi_cmdmode) /* Don't self-insert */
break;
#endif
if ((int)command_len >= (maxsize - 2)) /* Need to leave space for enter */
break;
command_len++;
if (cursor == (command_len - 1)) { /* Append if at the end of the line */
command[cursor] = c;
command[cursor+1] = '\0';
cmdedit_set_out_char(' ');
} else { /* Insert otherwise */
int sc = cursor;
memmove(command + sc + 1, command + sc, command_len - sc);
command[sc] = c;
sc++;
/* rewrite from cursor */
input_end();
/* to prev x pos + 1 */
input_backward(cursor - sc);
}
break;
}
if (break_out) /* Enter is the command terminator, no more input. */
break;
#if ENABLE_FEATURE_TAB_COMPLETION
if (c != '\t')
lastWasTab = FALSE;
#endif
}
if (command_len > 0)
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(stdout);
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(stdout);
fgets(command, maxsize, stdin);
return strlen(command);
}
#endif /* FEATURE_COMMAND_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 */