cmdedit.c

shell-HHARM9200.rar 华恒 AT91rm9200 中Busybox shell的源代码

				}
		}
		/* 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 = bb_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   */
			redraw(cmdedit_y, len - 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 sav_cursor = cursor;        /* change goto_new_line() */

			/* Go to the next line */
			goto_new_line();
			showfiles(matches, num_matches);
			redraw(0, len - sav_cursor);
		}
	}
}
#endif  /* CONFIG_FEATURE_COMMAND_TAB_COMPLETION */

#if MAX_HISTORY >= 1
static void get_previous_history(void)
{
	if(command_ps[0] != 0 || history[cur_history] == 0) {
		free(history[cur_history]);
		history[cur_history] = bb_xstrdup(command_ps);
	}
	cur_history--;
}

static int get_next_history(void)
{
	int ch = cur_history;

	if (ch < n_history) {
		get_previous_history(); /* save the current history line */
		return (cur_history = ch+1);
	} else {
		beep();
		return 0;
	}
}

#ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
extern void load_history ( const char *fromfile )
{
	FILE *fp;
	int hi;

	/* cleanup old */

	for(hi = n_history; hi > 0; ) {
		hi--;
		free ( history [hi] );
	}

	if (( fp = fopen ( fromfile, "r" ))) {

		for ( hi = 0; hi < MAX_HISTORY; ) {
			char * hl = bb_get_chomped_line_from_file(fp);
			int l;

			if(!hl)
				break;
			l = strlen(hl);
			if(l >= BUFSIZ)
				hl[BUFSIZ-1] = 0;
			if(l == 0 || hl[0] == ' ') {
				free(hl);
				continue;
			}
			history [hi++] = hl;
		}
		fclose ( fp );
	}
	cur_history = n_history = hi;
}

extern void save_history ( const char *tofile )
{
	FILE *fp = fopen ( tofile, "w" );

	if ( fp ) {
		int i;

		for ( i = 0; i < n_history; i++ ) {
			fprintf(fp, "%s\n", history [i]);
		}
		fclose ( fp );
	}
}
#endif

#endif

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 (sort of like
 * a mini readline).
 *
 * The following standard commands are not implemented:
 * ESC-b -- Move back one word
 * ESC-f -- Move forward one word
 * ESC-d -- Delete back one word
 * ESC-h -- Delete forward one word
 * CTL-t -- Transpose two characters
 *
 * Furthermore, the "vi" command editing keys are not implemented.
 *
 */


int cmdedit_read_input(char *prompt, char command[BUFSIZ])
{

	int break_out = 0;
	int lastWasTab = FALSE;
	unsigned char c = 0;

	/* prepare before init handlers */
	cmdedit_y = 0;  /* quasireal y, not true work if line > xt*yt */
	len = 0;
	command_ps = command;

	getTermSettings(0, (void *) &initial_settings);
	memcpy(&new_settings, &initial_settings, sizeof(struct termios));
	new_settings.c_lflag &= ~ICANON;        /* unbuffered input */
	/* Turn off echoing and CTRL-C, so we can trap it */
	new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
	/* Hmm, in linux c_cc[] not parsed if set ~ICANON */
	new_settings.c_cc[VMIN] = 1;
	new_settings.c_cc[VTIME] = 0;
	/* Turn off CTRL-C, so we can trap it */
#       ifndef _POSIX_VDISABLE
#               define _POSIX_VDISABLE '\0'
#       endif
	new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
	command[0] = 0;

	setTermSettings(0, (void *) &new_settings);
	handlers_sets |= SET_RESET_TERM;

	/* Now initialize things */
	cmdedit_init();
	/* Print out the command prompt */
	parse_prompt(prompt);

	while (1) {

		fflush(stdout);                 /* buffered out to fast */

		if (safe_read(0, &c, 1) < 1)
			/* if we can't read input then exit */
			goto prepare_to_die;

		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 */
			goto_new_line();
#ifndef CONFIG_ASH
			command[0] = 0;
			len = 0;
			lastWasTab = FALSE;
			put_prompt();
#else
			len = 0;
			break_out = -1; /* to control traps */
#endif
			break;
		case 4:
			/* Control-d -- Delete one character, or exit
			 * if the len=0 and no chars to delete */
			if (len == 0) {
prepare_to_die:
#if !defined(CONFIG_ASH)
				printf("exit");
				goto_new_line();
				/* cmdedit_reset_term() called in atexit */
				exit(EXIT_SUCCESS);
#else
				/* to control stopped jobs */
				len = break_out = -1;
				break;
#endif
			} 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 CONFIG_FEATURE_COMMAND_TAB_COMPLETION
			input_tab(&lastWasTab);
#endif
			break;
		case 11:
			/* Control-k -- clear to end of line */
			*(command + cursor) = 0;
			len = cursor;
			printf("\033[J");
			break;
		case 12:
			/* Control-l -- clear screen */
			printf("\033[H");
			redraw(0, len-cursor);
			break;
#if MAX_HISTORY >= 1
		case 14:
			/* Control-n -- Get next command in history */
			if (get_next_history())
				goto rewrite_line;
			break;
		case 16:
			/* Control-p -- Get previous command from history */
			if (cur_history > 0) {
				get_previous_history();
				goto rewrite_line;
			} else {
				beep();
			}
			break;
#endif
		case 21:
			/* Control-U -- Clear line before cursor */
			if (cursor) {
				strcpy(command, command + cursor);
				redraw(cmdedit_y, len -= cursor);
			}
			break;
		case 23:
			/* Control-W -- Remove the last word */
			while (cursor > 0 && isspace(command[cursor-1]))
				input_backspace();
			while (cursor > 0 &&!isspace(command[cursor-1]))
				input_backspace();
			break;
		case ESC:{
			/* escape sequence follows */
			if (safe_read(0, &c, 1) < 1)
				goto prepare_to_die;
			/* different vt100 emulations */
			if (c == '[' || c == 'O') {
				if (safe_read(0, &c, 1) < 1)
					goto prepare_to_die;
			}
			if (c >= '1' && c <= '9') {
				unsigned char dummy;

				if (safe_read(0, &dummy, 1) < 1)
					goto prepare_to_die;
				if(dummy != '~')
					c = 0;
			}
			switch (c) {
#ifdef CONFIG_FEATURE_COMMAND_TAB_COMPLETION
			case '\t':                      /* Alt-Tab */

				input_tab(&lastWasTab);
				break;
#endif
#if MAX_HISTORY >= 1
			case 'A':
				/* Up Arrow -- Get previous command from history */
				if (cur_history > 0) {
					get_previous_history();
					goto rewrite_line;
				} else {
					beep();
				}
				break;
			case 'B':
				/* Down Arrow -- Get next command in history */
				if (!get_next_history())
				break;
				/* Rewrite the line with the selected history item */
rewrite_line:
				/* change command */
				len = strlen(strcpy(command, history[cur_history]));
				/* redraw and go to end line */
				redraw(cmdedit_y, 0);
				break;
#endif
			case 'C':
				/* Right Arrow -- Move forward one character */
				input_forward();
				break;
			case 'D':
				/* Left Arrow -- Move back one character */
				input_backward(1);
				break;
			case '3':
				/* Delete */
				input_delete();
				break;
			case '1':
			case 'H':
				/* <Home> */
				input_backward(cursor);
				break;
			case '4':
			case 'F':
				/* <End> */
				input_end();
				break;
			default:
				c = 0;
				beep();
			}
			break;
		}

		default:        /* If it's regular input, do the normal thing */
#ifdef CONFIG_FEATURE_NONPRINTABLE_INVERSE_PUT
			/* Control-V -- Add non-printable symbol */
			if (c == 22) {
				if (safe_read(0, &c, 1) < 1)
					goto prepare_to_die;
				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(0, (void *) &initial_settings);
	handlers_sets &= ~SET_RESET_TERM;

#if MAX_HISTORY >= 1
	/* Handle command history log */
	/* cleanup may be saved current command line */
	if (len> 0) {                                      /* no put empty line */
		int i = n_history;

		free(history[MAX_HISTORY]);
		history[MAX_HISTORY] = 0;
			/* After max history, remove the oldest command */
		if (i >= MAX_HISTORY) {
			free(history[0]);
			for(i = 0; i < (MAX_HISTORY-1); i++)
				history[i] = history[i+1];
		}
		history[i++] = bb_xstrdup(command);
		cur_history = i;
		n_history = i;
#if defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
		num_ok_lines++;
#endif
	}
#else  /* MAX_HISTORY < 1 */
#if defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
	if (len > 0) {              /* no put empty line */
		num_ok_lines++;
	}
#endif
#endif  /* MAX_HISTORY >= 1 */
	if (break_out > 0) {
		command[len++] = '\n';          /* set '\n' */
		command[len] = 0;
	}
#if defined(CONFIG_FEATURE_CLEAN_UP) && defined(CONFIG_FEATURE_COMMAND_TAB_COMPLETION)
	input_tab(0);                           /* strong free */
#endif
#if defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
	free(cmdedit_prompt);
#endif
	cmdedit_reset_term();
	return len;
}



#endif  /* CONFIG_FEATURE_COMMAND_EDITING */


#ifdef TEST

const char *bb_applet_name = "debug stuff usage";

#ifdef CONFIG_FEATURE_NONPRINTABLE_INVERSE_PUT
#include <locale.h>
#endif

int main(int argc, char **argv)
{
	char buff[BUFSIZ];
	char *prompt =
#if defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
		"\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:\
\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] \
\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
#else
		"% ";
#endif

#ifdef CONFIG_FEATURE_NONPRINTABLE_INVERSE_PUT
	setlocale(LC_ALL, "");
#endif
	while(1) {
		int l;
		l = cmdedit_read_input(prompt, buff);
		if(l > 0 && buff[l-1] == '\n') {
			buff[l-1] = 0;
			printf("*** cmdedit_read_input() returned line =%s=\n", buff);
		} else {
			break;
		}
	}
	printf("*** cmdedit_read_input() detect ^D\n");
	return 0;
}

#endif  /* TEST */