void CvrpFileReader::processNextLine()
{
QString l_line = m_file->readLine();
if (l_line.isNull())
{
// qDebug() << "END OF FILE reached.";
return;
}
QStringList l_wordList = splitLine(l_line);
removeWhiteSpaces(l_wordList);
if (l_wordList.isEmpty())
{
// qDebug() << "Skipped empty line";
return;
}
processLine(l_wordList, l_line);
}
int runPath(char *consoleinput)
{
if(strlen(consoleinput) == 4) //path without any args
{
if(pathlist!=NULL)
{
printList(pathlist);
}
else
{
printf("[path variable not set]");
}
}
else //path with args
{
char *args = strndup(consoleinput+4, strlen(consoleinput)-4); //remove "path" from input
removeWhiteSpaces(args);
char *newpath = strndup(args+1, strlen(args)-1); //remove + or - from input
removeWhiteSpaces(newpath);
if(args[0]=='+')
{
//add to linkedlist
printf("\nAdding new path:[%s]\n", newpath);
pathlist = addNode(pathlist, newpath);
printList(pathlist);
return 0;
}
else if(args[0]=='-')
{
//remove from linkedlist
printf("\nDeleting path:[%s]\n", newpath);
pathlist = deleteNode(pathlist, newpath);
printList(pathlist);
return 0;
}
else
{
free(args);
free(newpath);
return 22;
}
free(newpath);
free(args);
}
return 12;
}
int main(int argc, char **argv)
{
while(1) //shell runs till user enters exit
{
char * cwd = malloc(256); //find current working directory for prompt
assert(cwd != NULL);
getCurrentDir(cwd);
printf("\nMyShell:%s$ ", cwd); //print shell prompt
free(cwd);
char *consoleinput = malloc(256);
assert(consoleinput != NULL);
//TO DO: Change buffer size to variable
readCommand(consoleinput); //accept input
removeNewLineChar(consoleinput); //remove '\n' character from input
removeWhiteSpaces(consoleinput); //remove all spaces before and after command
if(strncmp(consoleinput, SUPPORTED_COMMANDS[1], 4) == 0) //exit
{
free(consoleinput);
printf("\nMyShell Terminated\n");
return 0;
}
else if(strncmp(consoleinput, SUPPORTED_COMMANDS[0], 2) == 0) //cd
{
int result = runChangeDir(consoleinput);
if(result!=0)
{
perror("cd error:");
}
}
else if(strncmp(consoleinput, SUPPORTED_COMMANDS[2], 4) == 0) //path
{
int result = runPath(consoleinput);
if(result!=0)
{
errno = result;
perror("path error:");
}
}
else
{
//handle pipes
char **commands = parseArgv(consoleinput, SPECIAL_CHARS[4]); //input destoyed
int numcommands = 0;
while( commands[numcommands]!=NULL )
{
numcommands++;
}
//printf("\nNumber of commands:[%d]", numcommands);
const int numpipes = 2*(numcommands-1);
//printf("\nNumber of pipe file descriptors:[%d]", numpipes);
/*read and write ends of pipes stay apart by 3
-increment open pipe indexes by 2 after every command
-close all pipes
*/
int pipefds[numpipes];
int i=0;
for(i=0; i<numpipes;i=i+2)
{
pipe(pipefds+i);
}
//printf("\npipe() call successful");
// for(i=0;i<numpipes;i++)
// {
// printf("[%d]", pipefds[i]);
// }
int pipe_w = 1;
int pipe_r = pipe_w - 3;
int curcommand = 0;
while(curcommand < numcommands)
{
//printf("\nCommand number:[%d]", curcommand);
//printf("\ninside pipe loop for command [%s]", commands[curcommand]);
//Parse Command and Arguments into formatneeded by execv
char **argv = parseArgv(commands[curcommand], SPECIAL_CHARS[0]);
//printf("\nCurrent Command:[%s]", argv[0]);
if(findPath(argv) == 0)
{
//executeCommand(argv);
int child_pid = fork();
//int child_status;
if(child_pid < 0)
{
//errno = 3;
perror("fork error:");
}
else if(child_pid == 0) //fork success
{
if(pipe_w < numpipes)
{
//open write end
//printf("\nWrite pipe:[%d] to stdout", pipefds[pipe_w]);
if(dup2(pipefds[pipe_w], 1) < 0)
{
perror("pipe write-end error: ");
}
}
if((pipe_r >= 0)&&(pipe_r < numpipes))
{
//open read end
//printf("\nRead pipe:[%d] to stdin", pipefds[pipe_r]);
if(dup2(pipefds[pipe_r], 0) < 0)
{
perror("pipe read-end error: ");
}
}
for(i=0;i<numpipes;i++) //close off all pipes
{
//printf("\nclosing all pipes");
close(pipefds[i]);
}
if(execv(argv[0], argv) == -1)
{
perror("Bad command or filename:");
exit(0);
//TODO: child hangs here
}
//fflush(stdin);
}
}
else
{
printf("\nBad command or filename");
//TODO: ForkBomb occuring here
//exit(0);
}
free(argv);
//printf("\nIncrementing pipe ends, moving to next command.");
curcommand++;
pipe_w = pipe_w + 2;
pipe_r = pipe_r + 2;
}
//int i=0;
for(i=0;i<numpipes;i++) //close off all pipes
{
//printf("\nclosing all pipes");
close(pipefds[i]);
}
int status;
for(i=0;i<numcommands;i++)
{
wait(&status);
}
free(commands);
}
free(consoleinput);
}
freeList(pathlist);
}
