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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. #include <kbd/kbd.h>
  38. #include <kbd/keycode.h>
  39. #include <errno.h>
  40. #include <bool.h>
  41.  
  42. #include "config.h"
  43. #include "util.h"
  44. #include "scli.h"
  45. #include "input.h"
  46. #include "errors.h"
  47. #include "exec.h"
  48.  
  49. static void read_line(char *, int);
  50.  
  51. /* Tokenizes input from console, sees if the first word is a built-in, if so
  52.  * invokes the built-in entry point (a[0]) passing all arguments in a[] to
  53.  * the handler */
  54. int tok_input(cliuser_t *usr)
  55. {
  56.     char *cmd[WORD_MAX];
  57.     int n = 0, i = 0;
  58.     int rc = 0;
  59.     char *tmp;
  60.  
  61.     if (NULL == usr->line)
  62.         return CL_EFAIL;
  63.  
  64.     tmp = strdup(usr->line);
  65.  
  66.     cmd[n] = strtok(tmp, " ");
  67.     while (cmd[n] && n < WORD_MAX) {
  68.         cmd[++n] = strtok(NULL, " ");
  69.     }
  70.  
  71.     /* We have rubbish */
  72.     if (NULL == cmd[0]) {
  73.         rc = CL_ENOENT;
  74.         goto finit;
  75.     }
  76.  
  77.     /* Its a builtin command ? */
  78.     if ((i = (is_builtin(cmd[0]))) > -1) {
  79.         rc = run_builtin(i, cmd, usr);
  80.         goto finit;
  81.     /* Its a module ? */
  82.     } else if ((i = (is_module(cmd[0]))) > -1) {
  83.         rc = run_module(i, cmd);
  84.         goto finit;
  85.     }
  86.  
  87.     /* See what try_exec thinks of it */
  88.     rc = try_exec(cmd[0], cmd);
  89.  
  90. finit:
  91.     if (NULL != usr->line) {
  92.         free(usr->line);
  93.         usr->line = (char *) NULL;
  94.     }
  95.     if (NULL != tmp)
  96.         free(tmp);
  97.  
  98.     return rc;
  99. }
  100.  
  101. static void read_line(char *buffer, int n)
  102. {
  103.     kbd_event_t ev;
  104.     size_t offs, otmp;
  105.     wchar_t dec;
  106.  
  107.     offs = 0;
  108.     while (true) {
  109.         fflush(stdout);
  110.         if (kbd_get_event(&ev) < 0)
  111.             return;
  112.         if (ev.type == KE_RELEASE)
  113.             continue;
  114.  
  115.         if (ev.key == KC_ENTER || ev.key == KC_NENTER)
  116.             break;
  117.         if (ev.key == KC_BACKSPACE) {
  118.             if (offs > 0) {
  119.                 /*
  120.                  * Back up until we reach valid start of
  121.                  * character.
  122.                  */
  123.                 while (offs > 0) {
  124.                     --offs; otmp = offs;
  125.                     dec = str_decode(buffer, &otmp, n);
  126.                     if (dec != U_SPECIAL)
  127.                         break;
  128.                 }
  129.                 putchar('\b');
  130.             }
  131.             continue;
  132.         }
  133.         if (ev.c >= ' ') {
  134.             //putchar(ev.c);
  135.             if (chr_encode(ev.c, buffer, &offs, n - 1) == EOK)
  136.                 console_putchar(ev.c);
  137.         }
  138.     }
  139.     putchar('\n');
  140.     buffer[offs] = '\0';
  141. }
  142.  
  143. /* TODO:
  144.  * Implement something like editline() / readline(), if even
  145.  * just for command history and making arrows work. */
  146. void get_input(cliuser_t *usr)
  147. {
  148.     char line[INPUT_MAX];
  149.     size_t len = 0;
  150.  
  151.     console_set_style(STYLE_EMPHASIS);
  152.     printf("%s", usr->prompt);
  153.     console_set_style(STYLE_NORMAL);
  154.  
  155.     read_line(line, INPUT_MAX);
  156.     len = strlen(line);
  157.     /* Make sure we don't have rubbish or a C/R happy user */
  158.     if (len == 0 || line[0] == '\n')
  159.         return;
  160.     usr->line = strdup(line);
  161.  
  162.     return;
  163. }
  164.  
  165.