shell.h

#ifndef SHELL_H
#define SHELL_H
#include <stdlib.h>

/*Built in function defines*/
#define SET		1
#define PRINT	2
#define UNSET	3
#define CHANGE	4
#define AL		5
#define UNAL	6
#define BY		7

/*shell error declerations*/
#define CLOSE			-1		//close terminal
#define SYSERR			0		//error occured
#define OK 				1		//command is ok
#define NUMARGSERR		2		//number of args error
#define ILLPIPE			3		//illegal pipe error
#define ILLIORED		4		//illegal I/O red error
#define FILEDNE			5		//file does not exist
#define CMDNOTREC		6		//command not recognized

char errorMsg[100];
char temp[100];

char* str;
int str_length;

/*command variables*/
#define MAXCMDS 50
#define MAXARGS 50


int arg_counter;
int cmd_counter;
int bi;


typedef struct command{
	char cmdname[20];
	int bi_type;
	char arguments[MAXARGS][100];
	int num_args;
	int infd;
	int outfd;
} Cmd;

Cmd cmd_table[MAXCMDS];

int ret;

/*io variables*/
int inFile_red;
int outFile_red;
int errFile_red;
int append;

char inFile[100];
char outFile[100];
char errFile[100];

int amp;

/*environment variables*/
#define MAXENV 100
typedef struct env{
	char variable[100];
	char path[100];
	int used;
} Env;

Env env_table[MAXENV];

/*alias variables*/
#define MAXALI 100
typedef struct alias{
	char name[100];
	char value[100];
	int used;
} Alias;

Alias alias_table[MAXALI];

#endif