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busybox/cmdedit.c
Eric Andersen 5165fbed63 Oops. Since dirent.h depends on BB_FEATURE_SH_TAB_COMPLETION, put it 
after busybox.h is included.
2001-02-20 06:42:29 +00:00

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/* vi: set sw=4 ts=4: */
/*
* Termios command line History and Editting.
*
* Copyright (c) 1986-2001 may safely be consumed by a BSD or GPL license.
* Written by: Vladimir Oleynik <vodz@usa.net>
*
* Used ideas:
* Adam Rogoyski <rogoyski@cs.utexas.edu>
* Dave Cinege <dcinege@psychosis.com>
* Jakub Jelinek (c) 1995
* Erik Andersen <andersee@debian.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.
Small bugs (simple effect):
- not true viewing if terminal size (x*y symbols) less
size (prompt + editor`s line + 2 symbols)
*/
//#define TEST
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <ctype.h>
#include <signal.h>
#include <limits.h>
#ifndef TEST
#include "busybox.h"
#define D(x)
#else
#define BB_FEATURE_SH_COMMAND_EDITING
#define BB_FEATURE_SH_TAB_COMPLETION
#define BB_FEATURE_SH_USERNAME_COMPLETION
#define BB_FEATURE_NONPRINTABLE_INVERSE_PUT
#define BB_FEATURE_BASH_STYLE_PROMT
#define BB_FEATURE_CLEAN_UP
#define D(x) x
#endif /* TEST */
#ifdef BB_FEATURE_SH_TAB_COMPLETION
#include <dirent.h>
#include <sys/stat.h>
#endif
#ifdef BB_FEATURE_SH_COMMAND_EDITING
#ifndef BB_FEATURE_SH_TAB_COMPLETION
#undef BB_FEATURE_SH_USERNAME_COMPLETION
#endif
#if defined(BB_FEATURE_SH_USERNAME_COMPLETION) || defined(BB_FEATURE_BASH_STYLE_PROMT)
#define BB_FEATURE_GETUSERNAME_AND_HOMEDIR
#endif
#ifdef BB_FEATURE_GETUSERNAME_AND_HOMEDIR
#ifndef TEST
#include "pwd_grp/pwd.h"
#else
#include <pwd.h>
#endif /* TEST */
#endif /* advanced FEATURES */
#ifdef TEST
void *xrealloc(void *old, size_t size)
{
return realloc(old, size);
}
void *xmalloc(size_t size)
{
return malloc(size);
}
char *xstrdup(const char *s)
{
return strdup(s);
}
void *xcalloc(size_t size, size_t se)
{
return calloc(size, se);
}
#define error_msg(s, d) fprintf(stderr, s, d)
#endif
struct history {
char *s;
struct history *p;
struct history *n;
};
/* Maximum length of the linked list for the command line history */
static const int MAX_HISTORY = 15;
/* First element in command line list */
static struct history *his_front = NULL;
/* Last element in command line list */
static struct history *his_end = NULL;
/* ED: sparc termios is broken: revert back to old termio handling. */
#if #cpu(sparc)
# include <termio.h>
# define termios termio
# define setTermSettings(fd,argp) ioctl(fd,TCSETAF,argp)
# define getTermSettings(fd,argp) ioctl(fd,TCGETA,argp)
#else
# include <termios.h>
# define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
# define getTermSettings(fd,argp) tcgetattr(fd, argp);
#endif
/* Current termio and the previous termio before starting sh */
static struct termios initial_settings, new_settings;
#ifndef _POSIX_VDISABLE
#define _POSIX_VDISABLE '\0'
#endif
static
volatile int cmdedit_termw = 80; /* actual terminal width */
static int history_counter = 0; /* Number of commands in history list */
static
volatile int handlers_sets = 0; /* Set next bites: */
enum {
SET_ATEXIT = 1, /* when atexit() has been called and
get euid,uid,gid to fast compare */
SET_TERM_HANDLERS = 2, /* set many terminates signal handlers */
SET_WCHG_HANDLERS = 4, /* winchg signal handler */
SET_RESET_TERM = 8, /* if the terminal needs to be reset upon exit */
};
static int cmdedit_x; /* real x terminal position */
static int cmdedit_y; /* pseudoreal y terminal position */
static int cmdedit_prmt_len; /* lenght prompt without colores string */
static int cursor; /* required global for signal handler */
static int len; /* --- "" - - "" - -"- --""-- --""--- */
static char *command_ps; /* --- "" - - "" - -"- --""-- --""--- */
static
#ifndef BB_FEATURE_BASH_STYLE_PROMT
const
#endif
char *cmdedit_prompt; /* --- "" - - "" - -"- --""-- --""--- */
/* Link into lash to reset context to 0 on ^C and such */
extern unsigned int shell_context;
#ifdef BB_FEATURE_GETUSERNAME_AND_HOMEDIR
static char *user_buf = "";
static char *home_pwd_buf = "";
static int my_euid;
#endif
#ifdef BB_FEATURE_BASH_STYLE_PROMT
static char *hostname_buf = "";
static int num_ok_lines = 1;
#endif
#ifdef BB_FEATURE_SH_TAB_COMPLETION
#ifndef BB_FEATURE_GETUSERNAME_AND_HOMEDIR
static int my_euid;
#endif
static int my_uid;
static int my_gid;
#endif /* BB_FEATURE_SH_TAB_COMPLETION */
static void cmdedit_setwidth(int w, int redraw_flg);
static void win_changed(int nsig)
{
struct winsize win = { 0, 0, 0, 0 };
static __sighandler_t previous_SIGWINCH_handler; /* for reset */
/* emulate || signal call */
if (nsig == -SIGWINCH || nsig == SIGWINCH) {
ioctl(0, TIOCGWINSZ, &win);
if (win.ws_col > 0) {
cmdedit_setwidth(win.ws_col, nsig == SIGWINCH);
}
}
/* Unix not all standart in recall signal */
if (nsig == -SIGWINCH) /* save previous handler */
previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
else if (nsig == SIGWINCH) /* signaled called handler */
signal(SIGWINCH, win_changed); /* set for next call */
else /* nsig == 0 */
/* set previous handler */
signal(SIGWINCH, previous_SIGWINCH_handler); /* reset */
}
static void cmdedit_reset_term(void)
{
if ((handlers_sets & SET_RESET_TERM) != 0) {
/* sparc and other have broken termios support: use old termio handling. */
setTermSettings(fileno(stdin), (void *) &initial_settings);
handlers_sets &= ~SET_RESET_TERM;
}
if ((handlers_sets & SET_WCHG_HANDLERS) != 0) {
/* reset SIGWINCH handler to previous (default) */
win_changed(0);
handlers_sets &= ~SET_WCHG_HANDLERS;
}
fflush(stdout);
#ifdef BB_FEATURE_CLEAN_UP
if (his_front) {
struct history *n;
//while(his_front!=his_end) {
while (his_front != his_end) {
n = his_front->n;
free(his_front->s);
free(his_front);
his_front = n;
}
}
#endif
}
/* special for recount position for scroll and remove terminal margin effect */
static void cmdedit_set_out_char(int next_char)
{
int c = command_ps[cursor];
if (c == 0)
c = ' '; /* destroy end char? */
#ifdef BB_FEATURE_NONPRINTABLE_INVERSE_PUT
if (!isprint(c)) { /* Inverse put non-printable characters */
if (((unsigned char) c) >= 128)
c -= 128;
if (((unsigned char) c) < ' ')
c += '@';
if (c == 127)
c = '?';
printf("\033[7m%c\033[0m", c);
} else
#endif
putchar(c);
if (++cmdedit_x >= cmdedit_termw) {
/* terminal is scrolled down */
cmdedit_y++;
cmdedit_x = 0;
if (!next_char)
next_char = ' ';
/* destroy "(auto)margin" */
putchar(next_char);
putchar('\b');
}
cursor++;
}
/* Move to end line. Bonus: rewrite line from cursor */
static void input_end(void)
{
while (cursor < len)
cmdedit_set_out_char(0);
}
/* Go to the next line */
static void goto_new_line(void)
{
input_end();
if (cmdedit_x)
putchar('\n');
}
static inline void out1str(const char *s)
{
fputs(s, stdout);
}
static inline void beep(void)
{
putchar('\007');
}
/* Move back one charactor */
/* special for slow terminal */
static void input_backward(int num)
{
if (num > cursor)
num = cursor;
cursor -= num; /* new cursor (in command, not terminal) */
if (cmdedit_x >= num) { /* no to up line */
cmdedit_x -= num;
if (num < 4)
while (num-- > 0)
putchar('\b');
else
printf("\033[%dD", num);
} else {
int count_y;
if (cmdedit_x) {
putchar('\r'); /* back to first terminal pos. */
num -= cmdedit_x; /* set previous backward */
}
count_y = 1 + num / cmdedit_termw;
printf("\033[%dA", count_y);
cmdedit_y -= count_y;
/* require forward after uping */
cmdedit_x = cmdedit_termw * count_y - num;
printf("\033[%dC", cmdedit_x); /* set term cursor */
}
}
static void put_prompt(void)
{
out1str(cmdedit_prompt);
cmdedit_x = cmdedit_prmt_len; /* count real x terminal position */
cursor = 0;
}
#ifdef BB_FEATURE_BASH_STYLE_PROMT
static void
add_to_prompt(char **prmt_mem_ptr, int *alm, int *prmt_len,
const char *addb)
{
int l = strlen(addb);
*prmt_len += l;
if (*alm < (*prmt_len) + 1) {
*alm = (*prmt_len) + 1;
*prmt_mem_ptr = xrealloc(*prmt_mem_ptr, *alm);
}
strcat(*prmt_mem_ptr, addb);
}
#endif
static void parse_prompt(const char *prmt_ptr)
{
#ifdef BB_FEATURE_BASH_STYLE_PROMT
int alm = strlen(prmt_ptr) + 1; /* supposedly require memory */
int prmt_len = 0;
int sub_len = 0;
int flg_not_length = '[';
char *prmt_mem_ptr = xstrdup(prmt_ptr);
char pwd_buf[PATH_MAX + 1];
char buf[16];
int c;
pwd_buf[0] = 0;
*prmt_mem_ptr = 0;
while (*prmt_ptr) {
c = *prmt_ptr++;
if (c == '\\') {
c = *prmt_ptr;
if (c == 0)
break;
prmt_ptr++;
switch (c) {
case 'u':
add_to_prompt(&prmt_mem_ptr, &alm, &prmt_len, user_buf);
continue;
case 'h':
if (hostname_buf[0] == 0) {
hostname_buf = xcalloc(256, 1);
if (gethostname(hostname_buf, 255) < 0) {
strcpy(hostname_buf, "?");
} else {
char *s = strchr(hostname_buf, '.');
if (s)
*s = 0;
}
}
add_to_prompt(&prmt_mem_ptr, &alm, &prmt_len,
hostname_buf);
continue;
case '$':
c = my_euid == 0 ? '#' : '$';
break;
case 'w':
if (pwd_buf[0] == 0) {
int l;
getcwd(pwd_buf, PATH_MAX);
l = strlen(home_pwd_buf);
if (home_pwd_buf[0] != 0 &&
strncmp(home_pwd_buf, pwd_buf, l) == 0) {
strcpy(pwd_buf + 1, pwd_buf + l);
pwd_buf[0] = '~';
}
}
add_to_prompt(&prmt_mem_ptr, &alm, &prmt_len, pwd_buf);
continue;
case '!':
snprintf(buf, sizeof(buf), "%d", num_ok_lines);
add_to_prompt(&prmt_mem_ptr, &alm, &prmt_len, buf);
continue;
case 'e':
case 'E': /* \e \E = \033 */
c = '\033';
break;
case 'x':
case 'X':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':{
int l;
int ho = 0;
char *eho;
if (c == 'X')
c = 'x';
for (l = 0; l < 3;) {
buf[l++] = *prmt_ptr;
buf[l] = 0;
ho = strtol(buf, &eho, c == 'x' ? 16 : 8);
if (ho > UCHAR_MAX || (eho - buf) < l) {
l--;
break;
}
prmt_ptr++;
}
buf[l] = 0;
ho = strtol(buf, 0, c == 'x' ? 16 : 8);
c = ho == 0 ? '?' : (char) ho;
break;
}
case '[':
case ']':
if (c == flg_not_length) {
flg_not_length = flg_not_length == '[' ? ']' : '[';
continue;
}
break;
}
}
buf[0] = c;
buf[1] = 0;
add_to_prompt(&prmt_mem_ptr, &alm, &prmt_len, buf);
if (flg_not_length == ']')
sub_len++;
}
cmdedit_prmt_len = prmt_len - sub_len;
cmdedit_prompt = prmt_mem_ptr;
#else
cmdedit_prompt = prmt_ptr;
cmdedit_prmt_len = strlen(prmt_ptr);
#endif
put_prompt();
}
/* draw promt, editor line, and clear tail */
static void redraw(int y, int back_cursor)
{
if (y > 0) /* up to start y */
printf("\033[%dA", y);
cmdedit_y = 0; /* new quasireal y */
putchar('\r');
put_prompt();
input_end(); /* rewrite */
printf("\033[J"); /* destroy tail after cursor */
input_backward(back_cursor);
}
/* Delete the char in front of the cursor */
static void input_delete(void)
{
int j = cursor;
if (j == len)
return;
strcpy(command_ps + j, command_ps + j + 1);
len--;
input_end(); /* rewtite new line */
cmdedit_set_out_char(0); /* destroy end char */
input_backward(cursor - j); /* back to old pos cursor */
}
/* Delete the char in back of the cursor */
static void input_backspace(void)
{
if (cursor > 0) {
input_backward(1);
input_delete();
}
}
/* Move forward one charactor */
static void input_forward(void)
{
if (cursor < len)
cmdedit_set_out_char(command_ps[cursor + 1]);
}
static void clean_up_and_die(int sig)
{
goto_new_line();
if (sig != SIGINT)
exit(EXIT_SUCCESS); /* cmdedit_reset_term() called in atexit */
cmdedit_reset_term();
}
static void cmdedit_setwidth(int w, int redraw_flg)
{
cmdedit_termw = cmdedit_prmt_len + 2;
if (w <= cmdedit_termw) {
cmdedit_termw = cmdedit_termw % w;
}
if (w > cmdedit_termw) {
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), len - cursor);
fflush(stdout);
}
}
}
extern void cmdedit_init(void)
{
if ((handlers_sets & SET_WCHG_HANDLERS) == 0) {
/* emulate usage handler to set handler and call yours work */
win_changed(-SIGWINCH);
handlers_sets |= SET_WCHG_HANDLERS;
}
if ((handlers_sets & SET_ATEXIT) == 0) {
#ifdef BB_FEATURE_GETUSERNAME_AND_HOMEDIR
struct passwd *entry;
my_euid = geteuid();
entry = getpwuid(my_euid);
if (entry) {
user_buf = xstrdup(entry->pw_name);
home_pwd_buf = xstrdup(entry->pw_dir);
}
#endif
#ifdef BB_FEATURE_SH_TAB_COMPLETION
#ifndef BB_FEATURE_GETUSERNAME_AND_HOMEDIR
my_euid = geteuid();
#endif
my_uid = getuid();
my_gid = getgid();
#endif /* BB_FEATURE_SH_TAB_COMPLETION */
handlers_sets |= SET_ATEXIT;
atexit(cmdedit_reset_term); /* be sure to do this only once */
}
if ((handlers_sets & SET_TERM_HANDLERS) == 0) {
signal(SIGKILL, clean_up_and_die);
signal(SIGINT, clean_up_and_die);
signal(SIGQUIT, clean_up_and_die);
signal(SIGTERM, clean_up_and_die);
handlers_sets |= SET_TERM_HANDLERS;
}
}
#ifdef BB_FEATURE_SH_TAB_COMPLETION
static int is_execute(const struct stat *st)
{
if ((!my_euid && (st->st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))) ||
(my_uid == st->st_uid && (st->st_mode & S_IXUSR)) ||
(my_gid == st->st_gid && (st->st_mode & S_IXGRP)) ||
(st->st_mode & S_IXOTH)) return TRUE;
return FALSE;
}
#ifdef BB_FEATURE_SH_USERNAME_COMPLETION
static char **username_tab_completion(char *ud, int *num_matches)
{
struct passwd *entry;
int userlen;
char *temp;
ud++; /* ~user/... to user/... */
userlen = strlen(ud);
if (num_matches == 0) { /* "~/..." or "~user/..." */
char *sav_ud = ud - 1;
char *home = 0;
if (*ud == '/') { /* "~/..." */
home = home_pwd_buf;
} else {
/* "~user/..." */
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) < BUFSIZ) {
char temp2[BUFSIZ]; /* argument size */
/* /home/user/... */
sprintf(temp2, "%s%s", home, ud);
strcpy(sav_ud, temp2);
}
}
return 0; /* void, result save to argument :-) */
} else {
/* "~[^/]*" */
char **matches = (char **) NULL;
int nm = 0;
setpwent();
while ((entry = getpwent()) != NULL) {
/* Null usernames should result in all users as possible completions. */
if ( /*!userlen || */ !strncmp(ud, entry->pw_name, userlen)) {
temp = xmalloc(3 + strlen(entry->pw_name));
sprintf(temp, "~%s/", entry->pw_name);
matches = xrealloc(matches, (nm + 1) * sizeof(char *));
matches[nm++] = temp;
}
}
endpwent();
(*num_matches) = nm;
return (matches);
}
}
#endif /* BB_FEATURE_SH_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;
char *tmp;
char *pth;
/* if not setenv PATH variable, to search cur dir "." */
if (flags != FIND_EXE_ONLY || (pth = getenv("PATH")) == 0 ||
/* PATH=<empty> or PATH=:<empty> */
*pth == 0 || (*pth == ':' && *(pth + 1) == 0)) {
return 1;
}
tmp = pth;
npth = 0;
for (;;) {
npth++; /* count words is + 1 count ':' */
tmp = strchr(tmp, ':');
if (tmp) {
if (*++tmp == 0)
break; /* :<empty> */
} else
break;
}
*p = xmalloc(npth * sizeof(char *));
tmp = pth;
(*p)[0] = xstrdup(tmp);
npth = 1; /* count words is + 1 count ':' */
for (;;) {
tmp = strchr(tmp, ':');
if (tmp) {
(*p)[0][(tmp - pth)] = 0; /* ':' -> '\0' */
if (*++tmp == 0)
break; /* :<empty> */
} else
break;
(*p)[npth++] = &(*p)[0][(tmp - pth)]; /* p[next]=p[0][&'\0'+1] */
}
return npth;
}
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;
}
static char **exe_n_cwd_tab_completion(char *command, int *num_matches,
int type)
{
char **matches = 0;
DIR *dir;
struct dirent *next;
char dirbuf[BUFSIZ];
int nm = *num_matches;
struct stat st;
char *path1[1];
char **paths = path1;
int npaths;
int i;
char found[BUFSIZ + 4 + PATH_MAX];
char *pfind = strrchr(command, '/');
path1[0] = ".";
if (pfind == NULL) {
/* no dir, if flags==EXE_ONLY - get paths, else "." */
npaths = path_parse(&paths, type);
pfind = command;
} else {
/* with dir */
/* save for change */
strcpy(dirbuf, command);
/* set dir only */
dirbuf[(pfind - command) + 1] = 0;
#ifdef BB_FEATURE_SH_USERNAME_COMPLETION
if (dirbuf[0] == '~') /* ~/... or ~user/... */
username_tab_completion(dirbuf, 0);
#endif
/* "strip" dirname in command */
pfind++;
paths[0] = dirbuf;
npaths = 1; /* only 1 dir */
}
for (i = 0; i < npaths; i++) {
dir = opendir(paths[i]);
if (!dir) /* Don't print an error */
continue;
while ((next = readdir(dir)) != NULL) {
const char *str_merge = "%s/%s";
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 (*paths[i] == '/' && paths[i][1] == 0
&& str_found[1] == 0) str_found = ""; /* only "/" */
else
continue;
}
if (paths[i][strlen(paths[i]) - 1] == '/')
str_merge = "%s%s";
sprintf(found, str_merge, paths[i], str_found);
/* hmm, remover in progress? */
if (stat(found, &st) < 0)
continue;
/* find with dirs ? */
if (paths[i] != dirbuf)
strcpy(found, next->d_name); /* only name */
if (S_ISDIR(st.st_mode)) {
/* name is directory */
/* algorithmic only "/" ? */
if (*str_found)
strcat(found, "/");
str_found = add_quote_for_spec_chars(found);
} else {
/* not put found file if search only dirs for cd */
if (type == FIND_DIR_ONLY)
continue;
str_found = add_quote_for_spec_chars(found);
if (type == FIND_FILE_ONLY ||
(type == FIND_EXE_ONLY && is_execute(&st) == TRUE))
strcat(str_found, " ");
}
/* Add it to the list */
matches = xrealloc(matches, (nm + 1) * sizeof(char *));
matches[nm++] = str_found;
}
closedir(dir);
}
if (paths != path1) {
free(paths[0]); /* allocated memory only in first member */
free(paths);
}
*num_matches = nm;
return (matches);
}
static int match_compare(const void *a, const void *b)
{
return strcmp(*(char **) a, *(char **) b);
}
#define QUOT (UCHAR_MAX+1)
#define collapse_pos(is, in) { \
memcpy(int_buf+is, int_buf+in, (BUFSIZ+1-is-in)*sizeof(int)); \
memcpy(pos_buf+is, pos_buf+in, (BUFSIZ+1-is-in)*sizeof(int)); }
static int find_match(char *matchBuf, int *len_with_quotes)
{
int i, j;
int command_mode;
int c, c2;
int int_buf[BUFSIZ + 1];
int pos_buf[BUFSIZ + 1];
/* set to integer dimension characters and own positions */
for (i = 0;; i++) {
int_buf[i] = (int) ((unsigned char) matchBuf[i]);
if (int_buf[i] == 0) {
pos_buf[i] = -1; /* indicator end line */
break;
} else
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++;
#ifdef BB_FEATURE_NONPRINTABLE_INVERSE_PUT
if (matchBuf[i] == '\t') /* algorithm equivalent */
int_buf[j] = ' ' | QUOT;
#endif
}
#ifdef BB_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 have 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
&& strncmp(&matchBuf[pos_buf[0]], "cd", 2) == 0)
command_mode = FIND_DIR_ONLY;
else {
command_mode = FIND_FILE_ONLY;
break;
}
}
/* "strlen" */
for (i = 0; int_buf[i]; i++);
/* 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++);
/* collapse quote or unquote // or /~ */
while ((int_buf[i] & ~QUOT) == '/' && (
(int_buf[i + 1] & ~QUOT) == '/'
|| (int_buf[i + 1] & ~QUOT) ==
'~')) i++;
if (i)
collapse_pos(0, i);
/* set only match and destroy quotes */
j = 0;
for (i = 0; pos_buf[i] >= 0; i++) {
matchBuf[i] = matchBuf[pos_buf[i]];
j = pos_buf[i] + 1;
}
matchBuf[i] = 0;
/* old lenght matchBuf with quotes symbols */
*len_with_quotes = j ? j - pos_buf[0] : 0;
return command_mode;
}
static void input_tab(int *lastWasTab)
{
/* Do TAB completion */
static int num_matches;
static char **matches;
if (lastWasTab == 0) { /* free all memory */
if (matches) {
while (num_matches > 0)
free(matches[--num_matches]);
free(matches);
matches = (char **) NULL;
}
return;
}
if (*lastWasTab == FALSE) {
char *tmp;
int len_found;
char matchBuf[BUFSIZ];
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 */
input_tab(0);
#ifdef BB_FEATURE_SH_USERNAME_COMPLETION
/* If the word starts with `~' and there is no slash in the word,
* then try completing this word as a username. */
if (matchBuf[0] == '~' && strchr(matchBuf, '/') == 0)
matches = username_tab_completion(matchBuf, &num_matches);
#endif
/* Try to match any executable in our path and everything
* in the current working directory that matches. */
if (!matches)
matches =
exe_n_cwd_tab_completion(matchBuf, &num_matches,
find_type);
/* Did we find exactly one match? */
if (!matches || num_matches > 1) {
char *tmp1;
beep();
if (!matches)
return; /* not found */
/* sort */
qsort(matches, num_matches, sizeof(char *), match_compare);
/* find minimal match */
tmp = xstrdup(matches[0]);
for (tmp1 = tmp; *tmp1; tmp1++)
for (len_found = 1; len_found < num_matches; len_found++)
if (matches[len_found][(tmp1 - tmp)] != *tmp1) {
*tmp1 = 0;
break;
}
if (*tmp == 0) { /* have unique */
free(tmp);
return;
}
} else { /* one match */
tmp = matches[0];
/* for next completion current found */
*lastWasTab = FALSE;
}
len_found = strlen(tmp);
/* have space to placed match? */
if ((len_found - strlen(matchBuf) + len) < BUFSIZ) {
/* 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 */
len = strlen(command_ps);
/* write out the matched command */
input_end();
input_backward(cursor - recalc_pos);
}
if (tmp != matches[0])
free(tmp);
} 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 i, col, l;
int sav_cursor = cursor; /* change goto_new_line() */
/* Go to the next line */
goto_new_line();
for (i = 0, col = 0; i < num_matches; i++) {
l = strlen(matches[i]);
if (l < 14)
l = 14;
printf("%-14s ", matches[i]);
if ((l += 2) > 16)
while (l % 16) {
putchar(' ');
l++;
}
col += l;
col -= (col / cmdedit_termw) * cmdedit_termw;
if (col > 60 && matches[i + 1] != NULL) {
putchar('\n');
col = 0;
}
}
/* Go to the next line and rewrite */
putchar('\n');
redraw(0, len - sav_cursor);
}
}
}
#endif /* BB_FEATURE_SH_TAB_COMPLETION */
static void get_previous_history(struct history **hp, struct history *p)
{
if ((*hp)->s)
free((*hp)->s);
(*hp)->s = xstrdup(command_ps);
*hp = p;
}
static inline void get_next_history(struct history **hp)
{
get_previous_history(hp, (*hp)->n);
}
enum {
ESC = 27,
DEL = 127,
};
/*
* This function is used to grab a character buffer
* from the input file descriptor and allows you to
* a string with full command editing (sortof 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
*
* Furthermore, the "vi" command editing keys are not implemented.
*
*/
extern void cmdedit_read_input(char *prompt, char command[BUFSIZ])
{
int inputFd = fileno(stdin);
int break_out = 0;
int lastWasTab = FALSE;
char c = 0;
struct history *hp = his_end;
/* prepare before init handlers */
cmdedit_y = 0; /* quasireal y, not true work if line > xt*yt */
len = 0;
command_ps = command;
if (new_settings.c_cc[VMIN] == 0) { /* first call */
getTermSettings(inputFd, (void *) &initial_settings);
memcpy(&new_settings, &initial_settings, sizeof(struct termios));
new_settings.c_cc[VMIN] = 1;
new_settings.c_cc[VTIME] = 0;
new_settings.c_cc[VINTR] = _POSIX_VDISABLE; /* Turn off CTRL-C, so we can trap it */
new_settings.c_lflag &= ~ICANON; /* unbuffered input */
new_settings.c_lflag &= ~(ECHO | ECHOCTL | ECHONL); /* Turn off echoing */
}
command[0] = 0;
setTermSettings(inputFd, (void *) &new_settings);
handlers_sets |= SET_RESET_TERM;
/* Print out the command prompt */
parse_prompt(prompt);
/* Now initialize things */
cmdedit_init();
while (1) {
fflush(stdout); /* buffered out to fast */
if (read(inputFd, &c, 1) < 1)
return;
switch (c) {
case '\n':
case '\r':
/* Enter */
goto_new_line();
break_out = 1;
break;
case 1:
/* Control-a -- Beginning of line */
input_backward(cursor);
break;
case 2:
/* Control-b -- Move back one character */
input_backward(1);
break;
case 3:
/* Control-c -- stop gathering input */
/* Link into lash to reset context to 0 on ^C and such */
shell_context = 0;
/* Go to the next line */
goto_new_line();
command[0] = 0;
return;
case 4:
/* Control-d -- Delete one character, or exit
* if the len=0 and no chars to delete */
if (len == 0) {
printf("exit");
clean_up_and_die(0);
} else {
input_delete();
}
break;
case 5:
/* Control-e -- End of line */
input_end();
break;
case 6:
/* Control-f -- Move forward one character */
input_forward();
break;
case '\b':
case DEL:
/* Control-h and DEL */
input_backspace();
break;
case '\t':
#ifdef BB_FEATURE_SH_TAB_COMPLETION
input_tab(&lastWasTab);
#endif
break;
case 14:
/* Control-n -- Get next command in history */
if (hp && hp->n && hp->n->s) {
get_next_history(&hp);
goto rewrite_line;
} else {
beep();
}
break;
case 16:
/* Control-p -- Get previous command from history */
if (hp && hp->p) {
get_previous_history(&hp, hp->p);
goto rewrite_line;
} else {
beep();
}
break;
case 21:
/* Control-U -- Clear line before cursor */
if (cursor) {
strcpy(command, command + cursor);
redraw(cmdedit_y, len -= cursor);
}
break;
case ESC:{
/* escape sequence follows */
if (read(inputFd, &c, 1) < 1)
return;
/* different vt100 emulations */
if (c == '[' || c == 'O') {
if (read(inputFd, &c, 1) < 1)
return;
}
switch (c) {
#ifdef BB_FEATURE_SH_TAB_COMPLETION
case '\t': /* Alt-Tab */
input_tab(&lastWasTab);
break;
#endif
case 'A':
/* Up Arrow -- Get previous command from history */
if (hp && hp->p) {
get_previous_history(&hp, hp->p);
goto rewrite_line;
} else {
beep();
}
break;
case 'B':
/* Down Arrow -- Get next command in history */
if (hp && hp->n && hp->n->s) {
get_next_history(&hp);
goto rewrite_line;
} else {
beep();
}
break;
/* Rewrite the line with the selected history item */
rewrite_line:
/* change command */
len = strlen(strcpy(command, hp->s));
/* redraw and go to end line */
redraw(cmdedit_y, 0);
break;
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();
break;
case '1':
case 'H':
/* Home (Ctrl-A) */
input_backward(cursor);
break;
case '4':
case 'F':
/* End (Ctrl-E) */
input_end();
break;
default:
if (!(c >= '1' && c <= '9'))
c = 0;
beep();
}
if (c >= '1' && c <= '9')
do
if (read(inputFd, &c, 1) < 1)
return;
while (c != '~');
break;
}
default: /* If it's regular input, do the normal thing */
#ifdef BB_FEATURE_NONPRINTABLE_INVERSE_PUT
/* Control-V -- Add non-printable symbol */
if (c == 22) {
if (read(inputFd, &c, 1) < 1)
return;
if (c == 0) {
beep();
break;
}
} else
#endif
if (!isprint(c)) /* Skip non-printable characters */
break;
if (len >= (BUFSIZ - 2)) /* Need to leave space for enter */
break;
len++;
if (cursor == (len - 1)) { /* Append if at the end of the line */
*(command + cursor) = c;
*(command + cursor + 1) = 0;
cmdedit_set_out_char(0);
} else { /* Insert otherwise */
int sc = cursor;
memmove(command + sc + 1, command + sc, 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 (c != '\t')
lastWasTab = FALSE;
}
setTermSettings(inputFd, (void *) &initial_settings);
handlers_sets &= ~SET_RESET_TERM;
/* Handle command history log */
if (len) { /* no put empty line */
struct history *h = his_end;
char *ss;
ss = xstrdup(command); /* duplicate */
if (h == 0) {
/* No previous history -- this memory is never freed */
h = his_front = xmalloc(sizeof(struct history));
h->n = xmalloc(sizeof(struct history));
h->p = NULL;
h->s = ss;
h->n->p = h;
h->n->n = NULL;
h->n->s = NULL;
his_end = h->n;
history_counter++;
} else {
/* Add a new history command -- this memory is never freed */
h->n = xmalloc(sizeof(struct history));
h->n->p = h;
h->n->n = NULL;
h->n->s = NULL;
h->s = ss;
his_end = h->n;
/* After max history, remove the oldest command */
if (history_counter >= MAX_HISTORY) {
struct history *p = his_front->n;
p->p = NULL;
free(his_front->s);
free(his_front);
his_front = p;
} else {
history_counter++;
}
}
#if defined(BB_FEATURE_BASH_STYLE_PROMT)
num_ok_lines++;
#endif
}
command[len++] = '\n'; /* set '\n' */
command[len] = 0;
#if defined(BB_FEATURE_CLEAN_UP) && defined(BB_FEATURE_SH_TAB_COMPLETION)
input_tab(0); /* strong free */
#endif
#if defined(BB_FEATURE_BASH_STYLE_PROMT)
free(cmdedit_prompt);
#endif
return;
}
/* Undo the effects of cmdedit_init(). */
extern void cmdedit_terminate(void)
{
cmdedit_reset_term();
if ((handlers_sets & SET_TERM_HANDLERS) != 0) {
signal(SIGKILL, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGWINCH, SIG_DFL);
handlers_sets &= ~SET_TERM_HANDLERS;
}
}
#endif /* BB_FEATURE_SH_COMMAND_EDITING */
#ifdef TEST
unsigned int shell_context;
int main(int argc, char **argv)
{
char buff[BUFSIZ];
char *prompt =
#if defined(BB_FEATURE_BASH_STYLE_PROMT)
"\\[\\033[32;1m\\]\\u@\\[\\033[33;1m\\]\\h:\
\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] \
\\!\\[\\033[36;1m\\]\\$ \\[\\033[0m\\]";
#else
"% ";
#endif
shell_context = 1;
do {
cmdedit_read_input(prompt, buff);
printf("*** cmdedit_read_input() returned line =%s=\n", buff);
} while (shell_context);
printf("*** cmdedit_read_input() detect ^C\n");
return 0;
}
#endif /* TEST */
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