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596 lines
14 KiB
C
596 lines
14 KiB
C
/*
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* Termios command line History and Editting for NetBSD sh (ash)
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* Copyright (c) 1999
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* Main code: Adam Rogoyski <rogoyski@cs.utexas.edu>
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* Etc: Dave Cinege <dcinege@psychosis.com>
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* Adjusted for busybox: Erik Andersen <andersee@debian.org>
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*
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* You may use this code as you wish, so long as the original author(s)
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* are attributed in any redistributions of the source code.
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* This code is 'as is' with no warranty.
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* This code may safely be consumed by a BSD or GPL license.
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*
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* v 0.5 19990328 Initial release
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*
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* Future plans: Simple file and path name completion. (like BASH)
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*
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*/
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/*
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Usage and Known bugs:
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Terminal key codes are not extensive, and more will probably
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need to be added. This version was created on Debian GNU/Linux 2.x.
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Delete, Backspace, Home, End, and the arrow keys were tested
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to work in an Xterm and console. Ctrl-A also works as Home.
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Ctrl-E also works as End. The binary size increase is <3K.
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Editting will not display correctly for lines greater then the
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terminal width. (more then one line.) However, history will.
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*/
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#include "internal.h"
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#ifdef BB_FEATURE_SH_COMMAND_EDITING
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termio.h>
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#include <ctype.h>
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#include <signal.h>
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#include "cmdedit.h"
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#define MAX_HISTORY 15 /* Maximum length of the linked list for the command line history */
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#define ESC 27
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#define DEL 127
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#define member(c, s) ((c) ? ((char *)strchr ((s), (c)) != (char *)NULL) : 0)
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#define whitespace(c) (((c) == ' ') || ((c) == '\t'))
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static struct history *his_front = NULL; /* First element in command line list */
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static struct history *his_end = NULL; /* Last element in command line list */
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static struct termio old_term, new_term; /* Current termio and the previous termio before starting ash */
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static int history_counter = 0; /* Number of commands in history list */
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static int reset_term = 0; /* Set to true if the terminal needs to be reset upon exit */
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char *parsenextc; /* copy of parsefile->nextc */
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struct history {
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char *s;
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struct history *p;
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struct history *n;
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};
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/* Version of write which resumes after a signal is caught. */
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int xwrite(int fd, char *buf, int nbytes)
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{
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int ntry;
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int i;
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int n;
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n = nbytes;
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ntry = 0;
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for (;;) {
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i = write(fd, buf, n);
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if (i > 0) {
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if ((n -= i) <= 0)
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return nbytes;
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buf += i;
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ntry = 0;
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} else if (i == 0) {
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if (++ntry > 10)
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return nbytes - n;
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} else if (errno != EINTR) {
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return -1;
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}
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}
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}
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/* Version of ioctl that retries after a signal is caught. */
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int xioctl(int fd, unsigned long request, char *arg)
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{
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int i;
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while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
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return i;
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}
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void cmdedit_reset_term(void)
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{
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if (reset_term)
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xioctl(fileno(stdin), TCSETA, (void *) &old_term);
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}
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void prepareToDie(int sig)
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{
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cmdedit_reset_term();
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fprintf(stdout, "\n");
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exit(TRUE);
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}
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void input_home(int outputFd, int *cursor)
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{ /* Command line input routines */
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while (*cursor > 0) {
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xwrite(outputFd, "\b", 1);
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--*cursor;
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}
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}
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void input_delete(int outputFd, int cursor)
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{
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int j = 0;
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memmove(parsenextc + cursor, parsenextc + cursor + 1,
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BUFSIZ - cursor - 1);
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for (j = cursor; j < (BUFSIZ - 1); j++) {
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if (!*(parsenextc + j))
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break;
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else
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xwrite(outputFd, (parsenextc + j), 1);
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}
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xwrite(outputFd, " \b", 2);
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while (j-- > cursor)
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xwrite(outputFd, "\b", 1);
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}
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void input_end(int outputFd, int *cursor, int len)
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{
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while (*cursor < len) {
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xwrite(outputFd, "\033[C", 3);
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++*cursor;
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}
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}
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void input_backspace(int outputFd, int *cursor, int *len)
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{
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int j = 0;
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if (*cursor > 0) {
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xwrite(outputFd, "\b \b", 3);
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--*cursor;
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memmove(parsenextc + *cursor, parsenextc + *cursor + 1,
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BUFSIZ - *cursor + 1);
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for (j = *cursor; j < (BUFSIZ - 1); j++) {
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if (!*(parsenextc + j))
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break;
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else
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xwrite(outputFd, (parsenextc + j), 1);
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}
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xwrite(outputFd, " \b", 2);
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while (j-- > *cursor)
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xwrite(outputFd, "\b", 1);
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--*len;
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}
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}
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char **username_completion_matches( char* matchBuf)
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{
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fprintf(stderr, "\nin username_completion_matches\n");
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return ( (char**) NULL);
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}
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char **command_completion_matches( char* matchBuf)
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{
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fprintf(stderr, "\nin command_completion_matches\n");
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return ( (char**) NULL);
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}
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char **directory_completion_matches( char* matchBuf)
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{
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fprintf(stderr, "\nin directory_completion_matches\n");
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return ( (char**) NULL);
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}
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/*
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* This function is used to grab a character buffer
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* from the input file descriptor and allows you to
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* a string with full command editing (sortof like
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* a mini readline).
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*
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* The following standard commands are not implemented:
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* ESC-b -- Move back one word
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* ESC-f -- Move forward one word
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* ESC-d -- Delete back one word
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* ESC-h -- Delete forward one word
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* CTL-t -- Transpose two characters
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*
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* Furthermore, the "vi" command editing keys are not implemented.
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*
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* TODO: implement TAB command completion. :)
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*
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*/
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extern int cmdedit_read_input(int inputFd, int outputFd,
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char command[BUFSIZ])
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{
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int nr = 0;
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int len = 0;
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int j = 0;
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int cursor = 0;
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int break_out = 0;
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int ret = 0;
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int lastWasTab = FALSE;
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char **matches = (char **)NULL;
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char c = 0;
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struct history *hp = his_end;
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memset(command, 0, sizeof(command));
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parsenextc = command;
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if (!reset_term) {
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xioctl(inputFd, TCGETA, (void *) &old_term);
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memcpy(&new_term, &old_term, sizeof(struct termio));
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new_term.c_cc[VMIN] = 1;
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new_term.c_cc[VTIME] = 0;
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new_term.c_lflag &= ~ICANON; /* unbuffered input */
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new_term.c_lflag &= ~ECHO;
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xioctl(inputFd, TCSETA, (void *) &new_term);
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reset_term = 1;
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} else {
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xioctl(inputFd, TCSETA, (void *) &new_term);
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}
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memset(parsenextc, 0, BUFSIZ);
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while (1) {
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if ((ret = read(inputFd, &c, 1)) < 1)
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return ret;
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switch (c) {
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case 1:
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/* Control-a -- Beginning of line */
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input_home(outputFd, &cursor);
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case 5:
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/* Control-e -- End of line */
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input_end(outputFd, &cursor, len);
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break;
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case 2:
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/* Control-b -- Move back one character */
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if (cursor > 0) {
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xwrite(outputFd, "\033[D", 3);
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cursor--;
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}
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break;
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case 6:
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/* Control-f -- Move forward one character */
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if (cursor < len) {
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xwrite(outputFd, "\033[C", 3);
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cursor++;
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}
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break;
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case 4:
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/* Control-d -- Delete one character */
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if (cursor != len) {
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input_delete(outputFd, cursor);
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len--;
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} else if (len == 0) {
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prepareToDie(0);
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exit(0);
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}
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break;
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case 14:
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/* Control-n -- Get next command */
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if (hp && hp->n && hp->n->s) {
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free( hp->s);
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hp->s = strdup(parsenextc);
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hp = hp->n;
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goto hop;
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}
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break;
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case 16:
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/* Control-p -- Get previous command */
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if (hp && hp->p) {
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free( hp->s);
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hp->s = strdup(parsenextc);
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hp = hp->p;
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goto hop;
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}
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break;
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case '\t':
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{
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/* Do TAB completion */
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int in_command_position=0, ti=len-1;
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if (lastWasTab == FALSE) {
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char *tmp;
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char *matchBuf;
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if (matches) {
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free(matches);
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matches = (char **)NULL;
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}
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matchBuf = (char *) calloc(BUFSIZ, sizeof(char));
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/* Make a local copy of the string -- up
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* to the the position of the cursor */
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strcpy( matchBuf, parsenextc);
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matchBuf[cursor+1] = '\0';
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/* skip leading white space */
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tmp = matchBuf;
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while (*tmp && isspace(*tmp)) {
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(tmp)++;
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ti++;
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}
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/* Determine if this is a command word or not */
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//while ((ti > -1) && (whitespace (matchBuf[ti]))) {
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//printf("\nti=%d\n", ti);
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// ti--;
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// }
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printf("\nti=%d\n", ti);
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if (ti < 0) {
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in_command_position++;
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} else if (member(matchBuf[ti], ";|&{(`")) {
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int this_char, prev_char;
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in_command_position++;
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/* Handle the two character tokens `>&', `<&', and `>|'.
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We are not in a command position after one of these. */
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this_char = matchBuf[ti];
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prev_char = matchBuf[ti - 1];
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if ((this_char == '&' && (prev_char == '<' || prev_char == '>')) ||
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(this_char == '|' && prev_char == '>')) {
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in_command_position = 0;
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}
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/* For now, do not bother with catching quoted
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* expressions and marking them as not in command
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* positions. Some other day. Or not.
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*/
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//else if (char_is_quoted (matchBuf, ti)) {
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// in_command_position = 0;
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//}
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}
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printf("\nin_command_position=%d\n", in_command_position);
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/* If the word starts in `~', and there is no slash in the word,
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* then try completing this word as a username. */
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if (*matchBuf == '~' && !strchr (matchBuf, '/'))
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matches = username_completion_matches(matchBuf);
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/* If this word is in a command position, then complete over possible
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* command names, including aliases, built-ins, and executables. */
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if (!matches && in_command_position) {
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matches = command_completion_matches(matchBuf);
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/* If we are attempting command completion and nothing matches,
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* then try and match directories as a last resort... */
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if (!matches)
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matches = directory_completion_matches(matchBuf);
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}
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} else {
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printf("\nprinting match list\n");
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}
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/* Rewrite the whole line (for debugging) */
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for (; cursor > 0; cursor--)
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xwrite(outputFd, "\b", 1);
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len = strlen(parsenextc);
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xwrite(outputFd, parsenextc, len);
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cursor = len;
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break;
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}
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case '\b':
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case DEL:
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/* Backspace */
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input_backspace(outputFd, &cursor, &len);
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break;
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case '\n':
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/* Enter */
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*(parsenextc + len++ + 1) = c;
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xwrite(outputFd, &c, 1);
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break_out = 1;
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break;
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case ESC: {
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/* escape sequence follows */
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if ((ret = read(inputFd, &c, 1)) < 1)
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return ret;
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if (c == '[') { /* 91 */
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if ((ret = read(inputFd, &c, 1)) < 1)
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return ret;
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switch (c) {
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case 'A':
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/* Up Arrow -- Get previous command */
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if (hp && hp->p) {
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free( hp->s);
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hp->s = strdup(parsenextc);
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hp = hp->p;
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goto hop;
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}
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break;
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case 'B':
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/* Down Arrow -- Get next command */
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if (hp && hp->n && hp->n->s) {
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free( hp->s);
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hp->s = strdup(parsenextc);
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hp = hp->n;
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goto hop;
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}
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break;
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/* This is where we rewrite the line
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* using the selected history item */
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hop:
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len = strlen(parsenextc);
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/* return to begining of line */
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for (; cursor > 0; cursor--)
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xwrite(outputFd, "\b", 1);
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xwrite(outputFd, parsenextc, len);
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/* erase old command */
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for (j = 0; j < len; j++)
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xwrite(outputFd, " ", 1);
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/* return to begining of line */
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for (j = len; j > 0; j--)
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xwrite(outputFd, "\b", 1);
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memset(parsenextc, 0, BUFSIZ);
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/* write new command */
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strcpy(parsenextc, hp->s);
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len = strlen(hp->s);
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xwrite(outputFd, parsenextc, len);
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cursor = len;
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break;
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case 'C':
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/* Right Arrow -- Move forward one character */
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if (cursor < len) {
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xwrite(outputFd, "\033[C", 3);
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cursor++;
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}
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break;
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case 'D':
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/* Left Arrow -- Move back one character */
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if (cursor > 0) {
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xwrite(outputFd, "\033[D", 3);
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cursor--;
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}
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break;
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case '3':
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/* Delete */
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if (cursor != len) {
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input_delete(outputFd, cursor);
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len--;
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}
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break;
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case '1':
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/* Home (Ctrl-A) */
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input_home(outputFd, &cursor);
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break;
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case '4':
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/* End (Ctrl-E) */
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input_end(outputFd, &cursor, len);
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break;
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}
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if (c == '1' || c == '3' || c == '4')
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if ((ret = read(inputFd, &c, 1)) < 1)
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return ret; /* read 126 (~) */
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}
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if (c == 'O') {
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/* 79 */
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if ((ret = read(inputFd, &c, 1)) < 1)
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return ret;
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switch (c) {
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case 'H':
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/* Home (xterm) */
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input_home(outputFd, &cursor);
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break;
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case 'F':
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/* End (xterm) */
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input_end(outputFd, &cursor, len);
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break;
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}
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}
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c = 0;
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break;
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}
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default: /* If it's regular input, do the normal thing */
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if (!isprint(c)) /* Skip non-printable characters */
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break;
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if (len >= (BUFSIZ - 2)) /* Need to leave space for enter */
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break;
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len++;
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if (cursor == (len - 1)) { /* Append if at the end of the line */
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*(parsenextc + cursor) = c;
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} else { /* Insert otherwise */
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memmove(parsenextc + cursor + 1, parsenextc + cursor,
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len - cursor - 1);
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*(parsenextc + cursor) = c;
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for (j = cursor; j < len; j++)
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xwrite(outputFd, parsenextc + j, 1);
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for (; j > cursor; j--)
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xwrite(outputFd, "\033[D", 3);
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}
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cursor++;
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xwrite(outputFd, &c, 1);
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break;
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}
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if (c=='\t')
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lastWasTab = TRUE;
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else
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lastWasTab = FALSE;
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if (break_out) /* Enter is the command terminator, no more input. */
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break;
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}
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nr = len + 1;
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xioctl(inputFd, TCSETA, (void *) &old_term);
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reset_term = 0;
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/* Handle command history log */
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if (*(parsenextc)) {
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struct history *h = his_end;
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if (!h) {
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/* No previous history */
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h = his_front = malloc(sizeof(struct history));
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h->n = malloc(sizeof(struct history));
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h->p = NULL;
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h->s = strdup(parsenextc);
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h->n->p = h;
|
|
h->n->n = NULL;
|
|
h->n->s = NULL;
|
|
his_end = h->n;
|
|
history_counter++;
|
|
} else {
|
|
/* Add a new history command */
|
|
h->n = malloc(sizeof(struct history));
|
|
h->n->p = h;
|
|
h->n->n = NULL;
|
|
h->n->s = NULL;
|
|
h->s = strdup(parsenextc);
|
|
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 nr;
|
|
}
|
|
|
|
extern void cmdedit_init(void)
|
|
{
|
|
atexit(cmdedit_reset_term);
|
|
signal(SIGINT, prepareToDie);
|
|
signal(SIGQUIT, prepareToDie);
|
|
signal(SIGTERM, prepareToDie);
|
|
}
|
|
#endif /* BB_FEATURE_SH_COMMAND_EDITING */
|