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  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. #include <console.h>
  37.  
  38. #include "config.h"
  39. #include "util.h"
  40. #include "scli.h"
  41. #include "input.h"
  42. #include "errors.h"
  43. #include "exec.h"
  44.  
  45. extern volatile unsigned int cli_interactive;
  46.  
  47. /* Not exposed in input.h */
  48. static void cli_restricted(char *);
  49. static void read_line(char *, int);
  50.  
  51. /* More than a macro than anything */
  52. static void cli_restricted(char *cmd)
  53. {
  54.     printf("%s is not available in %s mode\n", cmd,
  55.         cli_interactive ? "interactive" : "non-interactive");
  56.  
  57.     return;
  58. }
  59.  
  60. /* Tokenizes input from console, sees if the first word is a built-in, if so
  61.  * invokes the built-in entry point (a[0]) passing all arguments in a[] to
  62.  * the handler */
  63. int tok_input(cliuser_t *usr)
  64. {
  65.     char *cmd[WORD_MAX];
  66.     int n = 0, i = 0;
  67.     int rc = 0;
  68.     char *tmp;
  69.  
  70.     if (NULL == usr->line)
  71.         return CL_EFAIL;
  72.  
  73.     tmp = cli_strdup(usr->line);
  74.  
  75.     /* Break up what the user typed, space delimited */
  76.  
  77.     /* TODO: Protect things in quotes / ticks, expand wildcards */
  78.     cmd[n] = cli_strtok(tmp, " ");
  79.     while (cmd[n] && n < WORD_MAX) {
  80.         cmd[++n] = cli_strtok(NULL, " ");
  81.     }
  82.  
  83.     /* We have rubbish */
  84.     if (NULL == cmd[0]) {
  85.         rc = CL_ENOENT;
  86.         goto finit;
  87.     }
  88.  
  89.     /* Its a builtin command */
  90.     if ((i = (is_builtin(cmd[0]))) > -1) {
  91.         /* Its not available in this mode, see what try_exec() thinks */
  92.         if (builtin_is_restricted(i)) {
  93.                 rc = try_exec(cmd[0], cmd);
  94.                 if (rc)
  95.                     /* No external matching it could be found, tell the
  96.                      * user that the command does exist, but is not
  97.                      * available in this mode. */
  98.                     cli_restricted(cmd[0]);
  99.                 goto finit;
  100.         }
  101.         /* Its a builtin, its available, run it */
  102.         rc = run_builtin(i, cmd, usr);
  103.         goto finit;
  104.     /* We repeat the same dance for modules */
  105.     } else if ((i = (is_module(cmd[0]))) > -1) {
  106.         if (module_is_restricted(i)) {
  107.             rc = try_exec(cmd[0], cmd);
  108.             if (rc)
  109.                 cli_restricted(cmd[0]);
  110.             goto finit;
  111.         }
  112.         rc = run_module(i, cmd);
  113.         goto finit;
  114.     } else {
  115.         /* Its not a module or builtin, restricted or otherwise.
  116.          * See what try_exec() thinks of it and just pass its return
  117.          * value back to the caller */
  118.         rc = try_exec(cmd[0], cmd);
  119.         goto finit;
  120.     }
  121.  
  122. finit:
  123.     if (NULL != usr->line) {
  124.         free(usr->line);
  125.         usr->line = (char *) NULL;
  126.     }
  127.     if (NULL != tmp)
  128.         free(tmp);
  129.  
  130.     return rc;
  131. }
  132.  
  133. /* Borrowed from Jiri Svoboda's 'cli' uspace app */
  134. static void read_line(char *buffer, int n)
  135. {
  136.     char c;
  137.     int chars;
  138.  
  139.     chars = 0;
  140.     while (chars < n - 1) {
  141.         c = getchar();
  142.         if (c < 0)
  143.             return;
  144.         if (c == '\n')
  145.             break;
  146.         if (c == '\b') {
  147.             if (chars > 0) {
  148.                 putchar('\b');
  149.                 --chars;
  150.             }
  151.             continue;
  152.         }
  153.         putchar(c);
  154.         buffer[chars++] = c;
  155.     }
  156.     putchar('\n');
  157.     buffer[chars] = '\0';
  158. }
  159.  
  160. /* TODO:
  161.  * Implement something like editline() / readline(), if even
  162.  * just for command history and making arrows work. */
  163. void get_input(cliuser_t *usr)
  164. {
  165.     char line[INPUT_MAX];
  166.     size_t len = 0;
  167.  
  168.     console_set_style(STYLE_EMPHASIS);
  169.     printf("%s", usr->prompt);
  170.     console_set_style(STYLE_NORMAL);
  171.  
  172.     read_line(line, INPUT_MAX);
  173.     len = strlen(line);
  174.     /* Make sure we don't have rubbish or a C/R happy user */
  175.     if (len == 0 || line[0] == '\n')
  176.         return;
  177.     usr->line = cli_strdup(line);
  178.  
  179.     return;
  180. }
  181.  
  182.