WebSVN – HelenOS – Blame – /trunk/uspace/app/bdsh/input.c

Rev	Author	Line No.	Line
3265	post	1	/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
		2	* All rights reserved.
		3	* Copyright (c) 2008, Jiri Svoboda - All Rights Reserved
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions are met:
		7	*
		8	* Redistributions of source code must retain the above copyright notice, this
		9	* list of conditions and the following disclaimer.
		10	*
		11	* Redistributions in binary form must reproduce the above copyright notice,
		12	* this list of conditions and the following disclaimer in the documentation
		13	* and/or other materials provided with the distribution.
		14	*
		15	* Neither the name of the original program's authors nor the names of its
		16	* contributors may be used to endorse or promote products derived from this
		17	* software without specific prior written permission.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
		20	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
		21	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
		22	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
		23	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
		24	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
		25	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
		26	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
		27	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
		28	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
		29	* POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31
		32	#include <stdio.h>
		33	#include <stdlib.h>
		34	#include <string.h>
		35	#include <io/stream.h>
		36
		37	#include "config.h"
		38	#include "util.h"
		39	#include "scli.h"
		40	#include "input.h"
		41	#include "errors.h"
		42	#include "exec.h"
		43
		44	extern volatile unsigned int cli_interactive;
		45
3372	post	46	/* Not exposed in input.h */
		47	static void cli_restricted(char *);
		48	static void read_line(char *, int);
		49
3265	post	50	/* More than a macro than anything */
3372	post	51	static void cli_restricted(char *cmd)
3265	post	52	{
3366	post	53	printf("%s is not available in %s mode\n", cmd,
3265	post	54	cli_interactive ? "interactive" : "non-interactive");
		55
		56	return;
		57	}
		58
		59	/* Tokenizes input from console, sees if the first word is a built-in, if so
		60	* invokes the built-in entry point (a[0]) passing all arguments in a[] to
		61	* the handler */
		62	int tok_input(cliuser_t *usr)
		63	{
		64	char *cmd[WORD_MAX];
		65	int n = 0, i = 0;
		66	int rc = 0;
3269	post	67	char *tmp;
3265	post	68
3269	post	69	if (NULL == usr->line)
		70	return CL_EFAIL;
3265	post	71
3268	post	72	tmp = cli_strdup(usr->line);
3275	post	73
3265	post	74	/* Break up what the user typed, space delimited */
3339	post	75
		76	/* TODO: Protect things in quotes / ticks, expand wildcards */
3265	post	77	cmd[n] = cli_strtok(tmp, " ");
		78	while (cmd[n] && n < WORD_MAX) {
		79	cmd[++n] = cli_strtok(NULL, " ");
		80	}
		81
		82	/* We have rubbish */
		83	if (NULL == cmd[0]) {
		84	rc = CL_ENOENT;
		85	goto finit;
		86	}
		87
3372	post	88	/* Its a builtin command */
3265	post	89	if ((i = (is_builtin(cmd[0]))) > -1) {
3372	post	90	/* Its not available in this mode, see what try_exec() thinks */
3265	post	91	if (builtin_is_restricted(i)) {
		92	rc = try_exec(cmd[0], cmd);
		93	if (rc)
3372	post	94	/* No external matching it could be found, tell the
		95	* user that the command does exist, but is not
		96	* available in this mode. */
3265	post	97	cli_restricted(cmd[0]);
		98	goto finit;
		99	}
3372	post	100	/* Its a builtin, its available, run it */
3265	post	101	rc = run_builtin(i, cmd, usr);
		102	goto finit;
3372	post	103	/* We repeat the same dance for modules */
3265	post	104	} else if ((i = (is_module(cmd[0]))) > -1) {
		105	if (module_is_restricted(i)) {
		106	rc = try_exec(cmd[0], cmd);
		107	if (rc)
		108	cli_restricted(cmd[0]);
		109	goto finit;
		110	}
		111	rc = run_module(i, cmd);
		112	goto finit;
		113	} else {
3372	post	114	/* Its not a module or builtin, restricted or otherwise.
		115	* See what try_exec() thinks of it and just pass its return
		116	* value back to the caller */
3265	post	117	rc = try_exec(cmd[0], cmd);
		118	goto finit;
		119	}
		120
		121	finit:
		122	if (NULL != usr->line) {
		123	free(usr->line);
		124	usr->line = (char *) NULL;
		125	}
3268	post	126	if (NULL != tmp)
		127	free(tmp);
3275	post	128
3265	post	129	return rc;
		130	}
		131
		132	/* Borrowed from Jiri Svoboda's 'cli' uspace app */
3372	post	133	static void read_line(char *buffer, int n)
3265	post	134	{
		135	char c;
		136	int chars;
		137
		138	chars = 0;
		139	while (chars < n - 1) {
		140	c = getchar();
		141	if (c < 0)
		142	return;
		143	if (c == '\n')
		144	break;
		145	if (c == '\b') {
		146	if (chars > 0) {
		147	putchar('\b');
		148	--chars;
		149	}
		150	continue;
		151	}
		152	putchar(c);
		153	buffer[chars++] = c;
		154	}
		155	putchar('\n');
		156	buffer[chars] = '\0';
		157	}
		158
3372	post	159	/* TODO:
		160	* Implement something like editline() / readline(), if even
		161	* just for command history and making arrows work. */
3265	post	162	void get_input(cliuser_t *usr)
		163	{
		164	char line[INPUT_MAX];
		165	size_t len = 0;
		166
		167	printf("%s", usr->prompt);
		168	read_line(line, INPUT_MAX);
		169	len = strlen(line);
		170	/* Make sure we don't have rubbish or a C/R happy user */
3275	post	171	if (len == 0 \|\| line[0] == '\n')
3265	post	172	return;
		173	usr->line = cli_strdup(line);
3304	post	174
3265	post	175	return;
		176	}
		177

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(root)/trunk/uspace/app/bdsh/input.c – Rev 3377