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ndk-busybox/cmdedit.c

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/* vi: set sw=4 ts=4: */
/*
* Termios command line History and Editting, originally
* intended for NetBSD sh (ash)
* Copyright (c) 1999
* Main code: Adam Rogoyski <rogoyski@cs.utexas.edu>
* Etc: Dave Cinege <dcinege@psychosis.com>
* Majorly adjusted/re-written for busybox:
* Erik Andersen <andersee@debian.org>
*
* You may use this code as you wish, so long as the original author(s)
* are attributed in any redistributions of the source code.
* This code is 'as is' with no warranty.
* This code may safely be consumed by a BSD or GPL license.
*
* v 0.5 19990328 Initial release
*
* Future plans: Simple file and path name completion. (like BASH)
*
*/
/*
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.
Editor with vertical scrolling and completion by
Vladimir Oleynik. vodz@usa.net (c) 2001
Small bug: not true work if terminal size (x*y symbols) less
size (prompt + editor`s line + 2 symbols)
*/
#include "busybox.h"
#ifdef BB_FEATURE_SH_COMMAND_EDITING
#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>
#ifdef BB_FEATURE_SH_TAB_COMPLETION
#include <sys/stat.h>
#endif
static const int MAX_HISTORY = 15; /* Maximum length of the linked list for the command line history */
enum {
ESC = 27,
DEL = 127,
};
#define member(c, s) ((c) ? ((char *)strchr ((s), (c)) != (char *)NULL) : 0)
#define whitespace(c) (((c) == ' ') || ((c) == '\t'))
static struct history *his_front = NULL; /* First element in command line list */
static struct history *his_end = NULL; /* Last element in command line list */
/* 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; /* actual terminal width */
static int history_counter = 0; /* Number of commands in history list */
static
volatile int handlers_sets = 0; /* Set next bites
when atexit() has been called
and set many "terminates" signal handlers
and winchg signal handler
and if the terminal needs to be reset upon exit
*/
enum {
SET_ATEXIT = 1,
SET_TERM_HANDLERS = 2,
SET_WCHG_HANDLERS = 4,
SET_RESET_TERM = 8,
};
static int cmdedit_x; /* real x terminal position,
require put prompt in start x position */
static int cmdedit_y; /* pseudoreal y terminal position */
static int cmdedit_prmt_len; /* for fast running, without duplicate calculate */
static int cursor; /* required global for signal handler */
static int len; /* --- "" - - "" - -"- --""-- --""--- */
static char *command_ps; /* --- "" - - "" - -"- --""-- --""--- */
static const char *cmdedit_prompt;/* --- "" - - "" - -"- --""-- --""--- */
/* Link into lash to reset context to 0
* on ^C and such */
extern unsigned int shell_context;
struct history {
char *s;
struct history *p;
struct history *n;
};
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 not called as a sig handler */
if(nsig == -SIGWINCH || nsig == SIGWINCH) {
ioctl(0, TIOCGWINSZ, &win);
if (win.ws_col > 0) {
cmdedit_setwidth( win.ws_col, nsig == SIGWINCH );
} else {
/* Default to 79 if their console doesn't want to share */
cmdedit_setwidth( 79, 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 /* 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 c, int next_char) {
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 without use
special control terminal strings, also saved size and speed! */
static void input_end (void) {
while(cursor < len)
cmdedit_set_out_char(command_ps[cursor], 0);
}
/* Go to the next line */
static void goto_new_line(void) {
input_end();
cmdedit_set_out_char('\n', 0);
}
static inline void out1str(const char *s) { fputs (s, stdout); }
static inline void beep (void) { putchar('\007'); }
/* Go to HOME position */
static void input_home(void)
{
while(cmdedit_y>0) { /* up to start y */
out1str("\033[A");
cmdedit_y--;
}
putchar('\r');
cursor = 0;
out1str(cmdedit_prompt);
cmdedit_x = cmdedit_prmt_len;
}
/* Move back one charactor */
static void input_backward(void) {
if (cursor > 0) {
cursor--;
if(cmdedit_x!=0) { /* no first position in terminal line */
putchar('\b');
cmdedit_x--;
}
else {
out1str("\033[A"); /* up */
cmdedit_y--;
/* to end in current terminal line */
while(cmdedit_x<(cmdedit_termw-1)) {
out1str("\033[C");
cmdedit_x++;
}
}
}
}
/* Delete the char in front of the cursor */
static void input_delete(void)
{
int j = cursor;
if (j == len)
return;
memmove (command_ps + j, command_ps + j + 1, BUFSIZ - j - 1);
len--;
input_end(); /* rewtite new line */
cmdedit_set_out_char(' ', 0); /* destroy end char */
while (j < cursor)
input_backward(); /* back to old pos cursor */
}
/* Delete the char in back of the cursor */
static void input_backspace(void)
{
if (cursor > 0) {
input_backward();
input_delete ();
}
}
/* Move forward one charactor */
static void input_forward(void)
{
if (cursor < len)
cmdedit_set_out_char(command_ps[cursor], 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 = w;
if(redraw_flg) {
int sav_cursor = cursor;
/* set variables for new terminal size */
cmdedit_y = sav_cursor/w;
cmdedit_x = sav_cursor-cmdedit_y*w;
/* redraw */
input_home();
input_end();
while(sav_cursor<cursor)
input_backward();
}
} else {
error_msg("\n*** Error: minimum screen width is %d", cmdedit_termw);
}
}
extern void cmdedit_init(void)
{
if((handlers_sets & SET_WCHG_HANDLERS)==0) {
/* pretend we received a signal in order to set term size and sig handling */
win_changed(-SIGWINCH);
handlers_sets |= SET_WCHG_HANDLERS;
}
if((handlers_sets & SET_ATEXIT)==0) {
atexit(cmdedit_reset_term); /* be sure to do this only once */
handlers_sets |= SET_ATEXIT;
}
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
#ifdef BB_FEATURE_USERNAME_COMPLETION
static char** username_tab_completion(char *ud, int *num_matches)
{
static struct passwd *entry;
int userlen;
char **matches = (char **) NULL;
char *temp;
int nm = 0;
setpwent ();
userlen = strlen (ud + 1);
while ((entry = getpwent ()) != NULL) {
/* Null usernames should result in all users as possible completions. */
if (!userlen || !strncmp (ud + 1, 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
enum {
FIND_EXE_ONLY = 0,
FIND_DIR_ONLY = 1,
FIND_FILE_ONLY = 2,
};
#include <dirent.h>
static int path_parse(char ***p, int flags)
{
int npth;
char *tmp;
char *pth;
if(flags!=FIND_EXE_ONLY || (pth=getenv("PATH"))==0) {
/* if not setenv PATH variable, to search cur dir "." */
(*p) = xmalloc(sizeof(char *));
(*p)[0] = xstrdup(".");
return 1;
}
tmp = pth;
npth=0;
for(;;) {
npth++; /* count words is + 1 count ':' */
tmp = strchr(tmp, ':');
if(tmp)
tmp++;
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'*/
tmp++;
} else
break;
(*p)[npth++] = &(*p)[0][(tmp-pth)]; /* p[next]=p[0][&'\0'+1] */
}
return npth;
}
static char** exe_n_cwd_tab_completion(char* command, int *num_matches, int type)
{
char *dirName;
char **matches = 0;
DIR *dir;
struct dirent *next;
char cmd [BUFSIZ+4];
char *dirbuf;
char found [BUFSIZ+4];
int nm = *num_matches;
struct stat st;
char **paths;
int npaths;
int i;
char full_pth[BUFSIZ+4+PATH_MAX];
strcpy(cmd, command); /* save for change (last '/' to '\0') */
dirName = strrchr(cmd, '/');
if(dirName==NULL) {
/* no dir, if flags==EXE_ONLY - get paths, else "." */
npaths = path_parse(&paths, type);
if(npaths==0)
return 0;
} else {
/* with dir */
/* save dir */
dirbuf = xstrdup(cmd);
/* set only dirname */
dirbuf[(dirName-cmd)+1]=0;
/* strip dirname in cmd */
strcpy(cmd, dirName+1);
paths = xmalloc(sizeof(char*));
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, just shut up and return */
return (matches);
}
while ((next = readdir(dir)) != NULL) {
/* matched ? */
if(strncmp(next->d_name, cmd, strlen(cmd)))
continue;
/* not see .name without .match */
if(*next->d_name == '.' && *cmd != '.')
continue;
sprintf(full_pth, "%s/%s", paths[i], next->d_name);
/* hmm, remover in progress? */
if(stat(full_pth, &st)<0)
continue;
/* Cool, found a match. */
if (S_ISDIR(st.st_mode)) {
/* name is directory */
strcpy(found, next->d_name);
strcat(found, "/");
if(type==FIND_DIR_ONLY)
strcat(found, " ");
} else {
/* not put found file if search only dirs for cd */
if(type==FIND_DIR_ONLY)
continue;
strcpy(found, next->d_name);
strcat(found, " ");
}
/* Add it to the list */
matches = xrealloc(matches, (nm+1)*sizeof(char *));
matches[nm++] = xstrdup(found);
}
}
free(paths[0]); /* allocate memory only in first member */
free(paths);
*num_matches = nm;
return (matches);
}
static void input_tab(int lastWasTab)
{
/* Do TAB completion */
static int num_matches;
static char **matches;
char matchBuf[BUFSIZ];
int pos = cursor;
int find_type=FIND_FILE_ONLY;
if (lastWasTab == FALSE) {
char *tmp, *tmp1;
int len_found;
/* For now, we will not bother with trying to distinguish
* whether the cursor is in/at a command extression -- we
* will always try all possible matches. If you don't like
* that then feel free to fix it.
*/
/* Make a local copy of the string -- up
* to the position of the cursor */
memset(matchBuf, 0, BUFSIZ);
tmp = strncpy(matchBuf, command_ps, cursor);
/* skip past any command seperator tokens */
while ( (tmp1=strpbrk(tmp, ";|&{(`")) != NULL) {
tmp = ++tmp1;
}
/* skip any leading white space */
while (*tmp == ' ')
tmp++;
if(strncmp(tmp, "cd ", 3)==0)
find_type = FIND_DIR_ONLY;
else if(strchr(tmp, ' ')==NULL)
find_type = FIND_EXE_ONLY;
/* find begin curent word */
if( (tmp1=strrchr(tmp, ' ')) != NULL) {
tmp = ++tmp1;
}
strcpy(matchBuf, tmp);
/* Free up any memory already allocated */
if (matches) {
while(num_matches>0)
free(matches[--num_matches]);
free(matches);
matches = (char **) NULL;
}
#ifdef BB_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 (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) {
beep();
return;
}
len_found = strlen(matches[0]);
/* have space to placed match? */
if ( (len_found-strlen(matchBuf)+len) < BUFSIZ ) {
int recalc_pos = len;
/* before word for match */
command_ps[pos-strlen(matchBuf)]=0;
/* tail line */
strcpy(matchBuf, command_ps+pos);
/* add match */
strcat(command_ps, matches[0]);
/* add tail */
strcat(command_ps, matchBuf);
/* write out the matched command */
len=strlen(command_ps);
recalc_pos = len-recalc_pos+pos;
input_end(); /* write */
while(recalc_pos<cursor)
input_backward();
return;
}
} 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;
int sav_cursor = cursor;
/* Go to the next line */
goto_new_line();
for (i=0,col=0; i<num_matches; i++) {
printf("%s ", matches[i]);
col += strlen(matches[i])+2;
col -= (col/cmdedit_termw)*cmdedit_termw;
if (col > 60 && matches[i+1] != NULL) {
putchar('\n');
col = 0;
}
}
/* Go to the next line and rewrite the prompt */
printf("\n%s", cmdedit_prompt);
cmdedit_x = cmdedit_prmt_len;
cmdedit_y = 0;
cursor = 0;
input_end(); /* Rewrite the command */
/* Put the cursor back to where it used to be */
while (sav_cursor < cursor)
input_backward();
}
}
}
#endif
static void get_previous_history(struct history **hp, char* command)
{
if ((*hp)->s)
free((*hp)->s);
(*hp)->s = strdup(command);
*hp = (*hp)->p;
}
static void get_next_history(struct history **hp, char* command)
{
if ((*hp)->s)
free((*hp)->s);
(*hp)->s = strdup(command);
*hp = (*hp)->n;
}
/*
* 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.
*
* TODO: implement TAB command completion. :)
*/
extern void cmdedit_read_input(char* prompt, char command[BUFSIZ])
{
int inputFd=fileno(stdin);
int j = 0;
int break_out = 0;
int ret = 0;
int lastWasTab = FALSE;
char c = 0;
struct history *hp = his_end;
len = 0;
cursor = 0;
command_ps = command;
if (new_settings.c_cc[VMIN]==0) {
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 */
}
setTermSettings(inputFd, (void*) &new_settings);
handlers_sets |= SET_RESET_TERM;
memset(command, 0, BUFSIZ);
cmdedit_init();
/* Print out the command prompt */
cmdedit_prompt = prompt;
cmdedit_prmt_len = strlen(prompt);
printf("%s", prompt);
cmdedit_x = cmdedit_prmt_len; /* count real x terminal position */
cmdedit_y = 0; /* quasireal y, not true work if line > xt*yt */
while (1) {
fflush(stdout); /* buffered out to fast */
if ((ret = read(inputFd, &c, 1)) < 1)
return;
//fprintf(stderr, "got a '%c' (%d)\n", c, c);
switch (c) {
case '\n':
case '\r':
/* Enter */
*(command + len) = c;
len++;
input_end ();
break_out = 1;
break;
case 1:
/* Control-a -- Beginning of line */
input_home();
break;
case 2:
/* Control-b -- Move back one character */
input_backward();
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();
#if 0
/* Rewrite the prompt */
printf("%s", prompt);
/* Reset the command string */
memset(command, 0, BUFSIZ);
len = cursor = 0;
#endif
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, command);
goto rewrite_line;
} else {
beep();
}
break;
case 16:
/* Control-p -- Get previous command from history */
if (hp && hp->p) {
get_previous_history(&hp, command);
goto rewrite_line;
} else {
beep();
}
break;
case ESC:{
/* escape sequence follows */
if ((ret = read(inputFd, &c, 1)) < 1)
return;
if (c == '[') { /* 91 */
if ((ret = read(inputFd, &c, 1)) < 1)
return;
switch (c) {
case 'A':
/* Up Arrow -- Get previous command from history */
if (hp && hp->p) {
get_previous_history(&hp, command);
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, command);
goto rewrite_line;
} else {
beep();
}
break;
/* Rewrite the line with the selected history item */
rewrite_line:
/* return to begin of line */
input_home ();
/* for next memmoves without set '\0' */
memset (command, 0, BUFSIZ);
/* change command */
strcpy (command, hp->s);
/* write new command */
for (j=0; command[j]; j++)
cmdedit_set_out_char(command[j], 0);
ret = cursor;
/* erase tail if required */
for (j = ret; j < len; j++)
cmdedit_set_out_char(' ', 0);
/* and backward cursor */
for (j = ret; j < len; j++)
input_backward();
len = cursor; /* set new len */
break;
case 'C':
/* Right Arrow -- Move forward one character */
input_forward();
break;
case 'D':
/* Left Arrow -- Move back one character */
input_backward();
break;
case '3':
/* Delete */
input_delete();
break;
case '1':
/* Home (Ctrl-A) */
input_home();
break;
case '4':
/* End (Ctrl-E) */
input_end();
break;
default:
beep();
}
if (c == '1' || c == '3' || c == '4')
if ((ret = read(inputFd, &c, 1)) < 1)
return; /* read 126 (~) */
}
if (c == 'O') {
/* 79 */
if ((ret = read(inputFd, &c, 1)) < 1)
return;
switch (c) {
case 'H':
/* Home (xterm) */
input_home();
break;
case 'F':
/* End (xterm) */
input_end();
break;
default:
beep();
}
}
c = 0;
break;
}
default: /* If it's regular input, do the normal thing */
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;
cmdedit_set_out_char(c, command[cursor+1]);
} else { /* Insert otherwise */
memmove(command + cursor + 1, command + cursor,
len - cursor - 1);
*(command + cursor) = c;
j = cursor+1;
/* rewrite from cursor */
input_end ();
/* to prev x pos + 1 */
while(cursor > j)
input_backward();
}
break;
}
if (c == '\t')
lastWasTab = TRUE;
else
lastWasTab = FALSE;
if (break_out) /* Enter is the command terminator, no more input. */
break;
}
setTermSettings (inputFd, (void *) &initial_settings);
handlers_sets &= ~SET_RESET_TERM;
/* Handle command history log */
if (len>1) { /* no put empty line (only '\n') */
struct history *h = his_end;
char *ss;
command[len-1] = 0; /* destroy end '\n' */
ss = strdup(command); /* duplicate without '\n' */
command[len-1] = '\n'; /* restore '\n' */
if (!h) {
/* 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++;
}
}
}
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 */
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