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ultrashell.c
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ultrashell.c
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/*
Copyright 2012-2014 Infinitycoding all rights reserved
This file is part of the Ultrashell.
The Ultrashell is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
any later version.
The Ultrashell is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Ultrashell. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @author Peter Hösch aka. BlitzBasic <[email protected]>
**/
#include <ultrashell.h>
#include <dynamic_array.h>
#include <basicCMDs.h>
#include <binaryTree.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
//#include <universe.h>
int input = -1;
/**
* @brief the main function of the ultrashell.
* @param argc the number of arguments (standart in main functions, currently ignored)
* @param argv the arguments values (standart in main functions, currently ignored)
* @return currently useless, because main never terminates
*/
int main(int argc, char **argv)
{
struct shell_state shell;
shell.last_ret_value = 0;
shell.cmds = initBinaryTree();
int counter = 0;
char inchar;
char wd[80];
dynamic_array *inbuffer = create_array(BLOCKSIZE);
while(input < 0)
{
input = open("/dev/kbd", O_RDONLY | O_APPEND, 0);
}
printf("Ultrashell started.\n");
getcwd(wd, 80);
printf("%s$ ", wd);
do
{
//inchar = getchar();
read(input, &inchar, sizeof(char));
switch(inchar)
{
case '\0':
break;
case '\b':
if(counter != 0)
{
set(inbuffer, --counter, '\0');
printf("\b");
}
break;
default:
set(inbuffer, counter++, inchar);
set(inbuffer, counter, '\0');
printf("%c", inchar);
break;
}
if(inchar == '\n')
{
parserLine(&shell, as_string(inbuffer));
getcwd(wd, 80);
printf("%s$ ", wd);
counter = 0;
set(inbuffer, counter, '\0');
}
}FOREVER;
return 0;
}
/**
* @brief creates the binary tree with the standart commands
* @return a pointer to the created binary tree
*/
binary_tree *initBinaryTree()
{
binary_tree *cmdTree = NULL;
loadFunction(&cmdTree, "echo", echo);
loadFunction(&cmdTree, "exec", exec);
loadFunction(&cmdTree, "sver", sver);
loadFunction(&cmdTree, "true", cmdtrue);
loadFunction(&cmdTree, "false", cmdfalse);
loadFunction(&cmdTree, "cd", cd);
loadFunction(&cmdTree, "pwd", pwd);
loadFunction(&cmdTree, "exit", sexit);
return cmdTree;
}
/**
* @brief parsers and executes a line (strange, with this name...)
* @param state the current state of the shell in which the line should be executed
* @param line the line which should be executed
* @return 0 if the command in the line was executed
* @return -1 if the command in the line is unknown
*/
int parserLine(struct shell_state *state, const char *line)
{
char **argv = NULL;
int argc = 0;
struct function *fct = NULL;
argc = getTokens(line, &argv);
argc = replaceTokens(argc, &argv, state);
if((fct = searchFunction(state->cmds, argv[0])) != NULL)
{
state->last_ret_value = fct->f(argc, argv);
for(; argc > 0; argc--)
free(argv[argc-1]);
return 0;
}
else
{
printf("%s : unknown filename or command.\n", argv[0]);
return -1;
}
return 0;
}
/**
* @brief separates a string into tokens
* @param instring the string which should be separated
* @param tokens the space in which the tokens should be placed
* @return the number of the tokens
*/
int getTokens(const char *instring, char ***tokens)
{
char currentToken[MAX_TOKEN_LENGTH];
int currentTokenNumber = 0;
int tokenSize = 1;
int tokenNumber = countTokens(instring);
int i = 0;
memset(currentToken, '\0', sizeof(currentToken));
tokens[0] = (char **)malloc(sizeof(char *) * tokenNumber+1);
for(i = 0; instring[i] != '\n' && instring[i] != '\0'; i++)
{
if(instring[i] == ' ')
{
while(instring[i + 1] == ' ')
i++;
currentToken[tokenSize] = '\0';
tokens[0][currentTokenNumber] = (char *)malloc(sizeof(char) * (tokenSize+1));
strncpy(tokens[0][currentTokenNumber], currentToken, (tokenSize+1));
memset(currentToken, '\0', sizeof(currentToken));
currentTokenNumber++;
tokenSize = 1;
}
else
{
currentToken[tokenSize - 1] = instring[i];
tokenSize++;
}
}
currentToken[tokenSize] = '\0';
tokens[0][currentTokenNumber] = (char *)malloc(sizeof(char) * (tokenSize+1));
strncpy(tokens[0][currentTokenNumber], currentToken, (tokenSize+1));
tokens[0][tokenNumber] = NULL;
return tokenNumber;
}
/**
* @brief replaces tokens in a string with other things (vars, ...)
* @param number the number of the tokens until now
* @param tokens the tokens until now
* @param state the state of the shell this function is executed in
* @return the number of the token now
*/
int replaceTokens(int number, char ***tokens, struct shell_state *state)
{
int i;
for(i = 0; i < number; i++)
{
if(strncmp(tokens[0][i], "$?", 2) == 0)
{
free(tokens[0][i]);
char tmpstring[20];
sprintf(tmpstring, "%d", state->last_ret_value);
int length = strlen(tmpstring);
tokens[0][i] = (char *)malloc(sizeof(char) * (length + 1));
strncpy(tokens[0][i], tmpstring, length);
}
}
return number;
}
/**
* @brief counts the number of tokens in a string
* @param instring the string in which the tokens should be counted
* @return the number of the tokens in the string
*/
int countTokens(const char *instring)
{
int tokenNumber = 1;
int i = 0;
for(i = 0; instring[i] != '\n' && instring[i] != '\0'; i++)
if(instring[i] == ' ' && instring[i + 1] != ' ')
tokenNumber++;
return tokenNumber;
}