summaryrefslogtreecommitdiff
path: root/cmdedit.c
blob: e043d5f5227d9cb4d3e7d97f3300ecf7e72ca4c8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
/* 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(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                                   /* 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\n", cmdedit_termw);
	}
}

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) {
		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;

    bb_setpwent ();
    userlen = strlen (ud + 1);

    while ((entry = bb_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;
	}
    }

    bb_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 */