source: mainline/uspace/app/bdsh/input.c@ e4f8c77

/*
 * Copyright (c) 2008 Tim Post
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <str.h>
#include <io/console.h>
#include <io/keycode.h>
#include <io/style.h>
#include <io/color.h>
#include <vfs/vfs.h>
#include <clipboard.h>
#include <macros.h>
#include <errno.h>
#include <assert.h>
#include <bool.h>
#include <tinput.h>

#include "config.h"
#include "util.h"
#include "scli.h"
#include "input.h"
#include "errors.h"
#include "exec.h"
#include "tok.h"

extern volatile unsigned int cli_quit;

/** Text input field. */
static tinput_t *tinput;

/* Private helpers */
static int run_command(char **, cliuser_t *, iostate_t *);
static void print_pipe_usage(void);

/* Tokenizes input from console, sees if the first word is a built-in, if so
 * invokes the built-in entry point (a[0]) passing all arguments in a[] to
 * the handler */
int process_input(cliuser_t *usr)
{
        char *cmd[WORD_MAX];
        int rc = 0;
        tokenizer_t tok;
        int i, pipe_count, processed_pipes;
        int pipe_pos[2];
        char **actual_cmd;
        char *redir_from = NULL;
        char *redir_to = NULL;

        if (NULL == usr->line)
                return CL_EFAIL;

        rc = tok_init(&tok, usr->line, cmd, WORD_MAX);
        if (rc != EOK) {
                goto finit;
        }
        
        rc = tok_tokenize(&tok);
        if (rc != EOK) {
                goto finit;
        }
        
        /* Until full support for pipes is implemented, allow for a simple case:
         * [from <file> |] command [| to <file>]
         * 
         * First find the pipes and check that there are no more
         */
        int cmd_length = 0;
        for (i = 0, pipe_count = 0; cmd[i] != NULL; i++, cmd_length++) {
                if (cmd[i][0] == '|') {
                        if (pipe_count >= 2) {
                                print_pipe_usage();
                                rc = ENOTSUP;
                                goto finit;
                        }
                        pipe_pos[pipe_count] = i;
                        pipe_count++;
                }
        }
        
        actual_cmd = cmd;
        processed_pipes = 0;
        
        /* Check if the first part (from <file> |) is present */
        if (pipe_count > 0 && pipe_pos[0] == 2 && str_cmp(cmd[0], "from") == 0) {
                /* Ignore the first three tokens (from, file, pipe) and set from */
                redir_from = cmd[1];
                actual_cmd = cmd + 3;
                processed_pipes++;
        }
        
        /* Check if the second part (| to <file>) is present */
        if ((pipe_count - processed_pipes) > 0 &&
            pipe_pos[processed_pipes] == cmd_length - 3 &&
            str_cmp(cmd[cmd_length-2], "to") == 0) {
                /* Ignore the last three tokens (pipe, to, file) and set to */
                redir_to = cmd[cmd_length-1];
                cmd[cmd_length-3] = NULL;
                cmd_length -= 3;
                processed_pipes++;
        }
        
        if (processed_pipes != pipe_count) {
                print_pipe_usage();
                rc = ENOTSUP;
                goto finit;
        }
        
        if (actual_cmd[0] == NULL) {
                print_pipe_usage();
                rc = ENOTSUP;
                goto finit;
        }
        
        iostate_t new_iostate = {
                .stdin = stdin,
                .stdout = stdout,
                .stderr = stderr
        };
        
        FILE *from = NULL;
        FILE *to = NULL;
        
        if (redir_from) {
                from = fopen(redir_from, "r");
                if (from == NULL) {
                        printf("Cannot open file %s\n", redir_from);
                        rc = errno;
                        goto finit_with_files;
                }
                new_iostate.stdin = from;
        }
        
        
        if (redir_to) {
                to = fopen(redir_to, "w");
                if (to == NULL) {
                        printf("Cannot open file %s\n", redir_to);
                        rc = errno;
                        goto finit_with_files;
                }
                new_iostate.stdout = to;
        }
        
        rc = run_command(cmd, usr, &new_iostate);
        
finit_with_files:
        if (from != NULL) {
                fclose(from);
        }
        if (to != NULL) {
                fclose(to);
        }
        
finit:
        if (NULL != usr->line) {
                free(usr->line);
                usr->line = (char *) NULL;
        }
        tok_fini(&tok);

        return rc;
}

void print_pipe_usage()
{
        printf("Invalid syntax!\n");
        printf("Usage of redirection (pipes in the future):\n");
        printf("from filename | command ...\n");
        printf("from filename | command ... | to filename\n");
        printf("command ... | to filename\n");
        
}

int run_command(char **cmd, cliuser_t *usr, iostate_t *new_iostate)
{
        int id = 0;
        
        /* We have rubbish */
        if (NULL == cmd[0]) {
                return CL_ENOENT;
        }
        
        /* Is it a builtin command ? */
        if ((id = (is_builtin(cmd[0]))) > -1) {
                return run_builtin(id, cmd, usr, new_iostate);
        }
        
        /* Is it a module ? */
        if ((id = (is_module(cmd[0]))) > -1) {
                return run_module(id, cmd, new_iostate);
        }

        /* See what try_exec thinks of it */
        return try_exec(cmd[0], cmd, new_iostate);
}

void get_input(cliuser_t *usr)
{
        char *str;
        int rc;
        
        console_flush(tinput->console);
        console_set_style(tinput->console, STYLE_EMPHASIS);
        printf("%s", usr->prompt);
        console_flush(tinput->console);
        console_set_style(tinput->console, STYLE_NORMAL);

        rc = tinput_read(tinput, &str);
        if (rc == ENOENT) {
                /* User requested exit */
                cli_quit = 1;
                putchar('\n');
                return;
        }

        if (rc != EOK) {
                /* Error in communication with console */
                return;
        }

        /* Check for empty input. */
        if (str_cmp(str, "") == 0) {
                free(str);
                return;
        }

        usr->line = str;
        return;
}

int input_init(void)
{
        tinput = tinput_new();
        if (tinput == NULL) {
                printf("Failed to initialize input.\n");
                return 1;
        }

        return 0;
}