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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.  
  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.  
  46. /* Not exposed in input.h */
  47. static void cli_restricted(char *);
  48. static void read_line(char *, int);
  49.  
  50. /* More than a macro than anything */
  51. static void cli_restricted(char *cmd)
  52. {
  53.     printf("%s is not available in %s mode\n", cmd,
  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;
  67.     char *tmp;
  68.  
  69.     if (NULL == usr->line)
  70.         return CL_EFAIL;
  71.  
  72.     tmp = cli_strdup(usr->line);
  73.  
  74.     /* Break up what the user typed, space delimited */
  75.  
  76.     /* TODO: Protect things in quotes / ticks, expand wildcards */
  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.  
  88.     /* Its a builtin command */
  89.     if ((i = (is_builtin(cmd[0]))) > -1) {
  90.         /* Its not available in this mode, see what try_exec() thinks */
  91.         if (builtin_is_restricted(i)) {
  92.                 rc = try_exec(cmd[0], cmd);
  93.                 if (rc)
  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. */
  97.                     cli_restricted(cmd[0]);
  98.                 goto finit;
  99.         }
  100.         /* Its a builtin, its available, run it */
  101.         rc = run_builtin(i, cmd, usr);
  102.         goto finit;
  103.     /* We repeat the same dance for modules */
  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 {
  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 */
  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.     }
  126.     if (NULL != tmp)
  127.         free(tmp);
  128.  
  129.     return rc;
  130. }
  131.  
  132. /* Borrowed from Jiri Svoboda's 'cli' uspace app */
  133. static void read_line(char *buffer, int n)
  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.  
  159. /* TODO:
  160.  * Implement something like editline() / readline(), if even
  161.  * just for command history and making arrows work. */
  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 */
  171.     if (len == 0 || line[0] == '\n')
  172.         return;
  173.     usr->line = cli_strdup(line);
  174.  
  175.     return;
  176. }
  177.  
  178.