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124 lines (88 loc) · 2.39 KB
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Copy pathshell.c
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124 lines (88 loc) · 2.39 KB
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/**
* shell
* Description: Main loop which displays the prompt, handles user input and
* user commands. printPrompt() displays the prompt while exitShell()
* is called at exit.
*/
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stddef.h>
#include <malloc.h>
#include <stdlib.h>
#include "posixVars.h"
#include "handleInput.h"
#include "handleCommand.h"
#include "commandList.h"
/* Function Declarations */
void printPrompt( void );
void exitShell( void );
int main() {
atexit( exitShell );
status = CONTINUE;
getcwd(cwd, PATH_MAX);
while ( status == CONTINUE ) {
TokenList * tList;
CommandList * newCommandList = theCommandList();
printPrompt();
tList = storeInput();
parseCommandList( newCommandList, tList );
// Free Token List memory
int i;
for (i = 0; i < MAX_TOKENS; ++i ) {
free(tList->parseStorage[i]);
}
free(tList->parseStorage);
free(tList);
tList = NULL;
CommandList * head = newCommandList;
Program * p;
while(newCommandList->program != NULL) {
handleCommand(newCommandList->program);
newCommandList->program = newCommandList->program->next;
}
// Free the Program Memory
while(head->program != NULL) {
p = head->program;
for(i = 0; i < 51; i++) {
free(p->argv[i]);
}
free(p);
head->program = head->program->next;
}
free(head);
fflush(stdout);
}
if ( status != ERROR )
return EXIT_SUCCESS;
else
return EXIT_FAILURE;
}
void printPrompt( )
/* Builds a string from the Current Working Directory,
hostName and loginName and prints it to the console in the
format <username>@<hostname>:<working_directory> $
*/
{
char current[ PATH_MAX + 1 ];
char hostName[ HOST_NAME_MAX + 1 ];
char loginName[ LOGIN_NAME_MAX + 1 ];
/* Get the Current Working Directory */
getcwd( current, PATH_MAX );
/* Get the hostname */
gethostname( hostName, HOST_NAME_MAX );
/* Get the loginName */
getlogin_r( loginName, LOGIN_NAME_MAX );
/* Make sure the strings are null terminated */
current[PATH_MAX] = 0;
hostName[ HOST_NAME_MAX ] = 0;
loginName[ LOGIN_NAME_MAX ] = 0;
fprintf( stdout, "%s@%s:%s $ \n", loginName, hostName, current );
// flush stdout
fflush( stdout );
}
void exitShell( ) {
printf ("\nExiting shell.\n" );
killZombieProcesses( );
}