ignoring homework folder for now jej

334/.gitignore

@@ -2,3 +2,4 @@ bin
 msh
 *txt
 *sh
+homework/

334/homework/1/binhex.txt

@@ -1,47 +0,0 @@
-
-# Problem lines begin with #@.
-# For each problem, put your answer on
-# the line following the problem line.
-# Do not modify this file in any way 
-# except to insert your answers.
-
-#@ 1 -- enter a number
-22
-#@ 2 -- enter a number
-7
-#@ 3 -- enter a number
-3
-#@ 4 -- enter a number
-25
-#@ 5 -- enter a number
-255
-#@ 6 -- enter a binary number
-1101
-#@ 7 -- enter a binary number
-10101
-#@ 8 -- enter a binary number
-10000
-#@ 9 -- enter a binary number
-110111
-#@ 10 -- enter a binary number
-1010000
-#@ 11 -- enter a number
-44
-#@ 12 -- enter a number
-18
-#@ 13 -- enter a number
-471
-#@ 14 -- enter a number
-255
-#@ 15 -- enter a number
-123
-#@ 16 -- enter a hex number (beginning with 0x)
-0x12
-#@ 17 -- enter a hex number
-0x05
-#@ 18 -- enter a hex number
-0x58
-#@ 19 -- enter a hex number
-0x7b
-#@ 20 -- enter a hex number
-0x64

334/homework/1/os-intro.txt

@@ -1,19 +0,0 @@
-
-# Homework 1 answer sheet.
-#
-# Problem lines begin with #@.
-# For each problem, put your answer on
-# the line following the problem line.
-# Do not modify this file in any way 
-# except to insert your answers.
-
-#@ 1 -- enter 'a', 'b', or 'c' (don't use quotes in any answer)
-a
-#@ 2 -- enter 'a', 'b', or 'c'
-b
-#@ 3 -- enter one or more letters, separated by commas
-b
-#@ 4 -- enter 'a' or 'b'
-a
-#@ 5 -- enter 'a', 'b', or 'c'
-b

334/homework/2/processes.txt

@@ -1,22 +0,0 @@
-# Instructions: edit this file to provide your homework answers.
-#
-# Problem numbers are shown on lines that begin with #@.
-# Please put your solution to a problem on the line *after* the
-# line with the problem number.
-#
-# Do not modify this file *except* to add lines as needed after each problem.
-# Blank lines are ignored.  You don't need to put your name in the file.
-#
-# No points will be awarded to incorrectly-formatted files.
-#
-
-#@ 1 -- enter 'a', 'b', or 'c'  (don't use quotes in any answer)
-b
-#@ 2 -- enter 'a', 'b', or 'c'
-c
-#@ 3 -- enter 'a' or 'b'
-b
-#@ 4 -- enter 'a' or 'b'
-b
-#@ 5 -- enter 'a', 'b', or 'c'
-c

334/homework/2/puzzle.txt

@@ -1,32 +0,0 @@
-# Instructions: edit this file to provide your homework answers.
-#
-# Problem numbers are shown on lines that begin with #@.
-# Please put your solution to a problem on the line *after* the
-# line with the problem number.
-#
-# Do not modify this file *except* to add lines as needed after each problem.
-# Blank lines are ignored.  You don't need to put your name in the file.
-#
-# No points will be awarded to incorrectly-formatted files.
-#
-
-#@ 1 -- enter a single number
-1
-#@ 2 -- enter 'Y' or 'N'  
-2
-#@ 3 -- enter 'Y' or 'N'  
-Y
-#@ 4 -- enter 'Y' or 'N'  
-N
-#@ 5 -- enter text on a single line
-some stuff
-#@ 6 -- enter 'Y' or 'N'  
-Y
-#@ 7 -- enter text on a single line
-stuff
-#@ 8 -- enter 'Y' or 'N'  
-N
-#@ 9 -- enter text on a single line
-some stuff
-#@ 10 -- enter 'Y' or 'N'  
-Y

334/homework/3/chap5.txt

@@ -1,14 +0,0 @@
-#
-# Problem lines begin with "#@".
-# For each problem line, enter your answer on the following line.
-# Do not modify this file in any way except to enter your answers.
-#
-
-#@ 1 -- enter 'a', 'b', or 'c' (don't use quotes in any answer)
-b
-#@ 2 -- enter 'a', 'b', or 'c' 
-a
-#@ 3 -- enter 'a', 'b', or 'c' 
-b
-#@ 4 -- enter 'a', 'b', or 'c' 
-a

334/homework/3/chap6.txt

@@ -1,14 +0,0 @@
-#
-# Problem lines begin with "#@".
-# For each problem line, enter your answer on the following line.
-# Do not modify this file in any way except to enter your answers.
-#
-
-#@ 1 -- enter 'a' or 'b'  (don't use quotes in any answer)
-b
-#@ 2 -- enter 'a', 'b', or 'c' 
-a
-#@ 3 -- enter 'T' or 'F'
-F
-#@ 4 -- enter 'T' or 'F'
-F

334/homework/msh/msh.c

@@ -1,151 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/wait.h>
-#include <time.h>
-#include <sys/types.h>
-
-#define PROMPT "msh> "
-#define EXIT_CMD "exit"
-#define MAX_BUF 121
-
-// Statuses from builtin responses
-#define RESP_HELP 1
-#define RESP_DATE 2
-#define RESP_ECHO 3
-#define RESP_SHELL 4
-#define RESP_CD_FAIL -1
-#define RESP_CD_SUCCESS 6
-
-// Sub statuses that are generally nice to have
-#define CD_NOP 0x1
-
-void echo(const char*);
-void remove_newline(char*);
-void exit_branch(const char*);
-int  builtin_response(char*);
-int cd_handler(char**, const int);
-
-int main(int argc, char** argv) {
-	FILE* file = NULL;
-	if(argc == 2) {
-		file = fopen(argv[1], "r");
-		if(!file) { return 1; }
-	}
-	char buffer[MAX_BUF];
-	while(1) {
-		// determine if we're reading from stdin or a stream of some sort
-		if(file == NULL && isatty(STDIN_FILENO)) {
-			printf("%s", PROMPT);
-			fgets(buffer, MAX_BUF, stdin);
-		}
-		else {
-			fgets(buffer, MAX_BUF, file);
-			printf("buffer: %s\n", buffer);
-		}
-
-		// Deal with EOF input
-		if(!strlen(buffer)) {
-			exit(0);
-		}
-		exit_branch(buffer);
-
-		remove_newline(buffer);
-		int status = builtin_response(buffer);
-		// the switch in case we need to add more response flags later
-		switch(status) {
-			case RESP_ECHO: 
-				echo(buffer);
-			case RESP_SHELL: // shell command handler was used
-				continue;
-			case RESP_CD_FAIL:
-				printf("msh: cd: No such file or directory\n");
-		}
-		memset(buffer, 0x00, MAX_BUF); // reset buffer after each usage
-	}
-	return 0;
-}
-
-void echo(const char* buf) {
-	printf("%s\n", buf);
-}
-
-
-void remove_newline(char* buf) {
-	char* c = buf;
-	while(*c != '\n') { c++; }
-	*c='\0';
-}
-
-void exit_branch(const char* buf) {
-	if(!strcmp(buf, EXIT_CMD)) {
-		exit(0);
-	}
-}
-
-int builtin_response(char* buffer) {
-#define STRING_DELIMITER " "
-#define TIME_FMT "%D"
-	exit_branch(buffer);	// exit is builtin so here we are
-	if(!strcmp(buffer, "help")) {
-		echo("enter Linux commands, or ‘exit’ to exit");
-		return RESP_HELP;
-	}
-
-	// Printout the date today
-	if(!strcmp(buffer, "date")) {
-		static char date[64];
-		time_t now = time(0);
-		strftime(date, sizeof(date), TIME_FMT, localtime(&now));
-		echo(date);
-		return RESP_DATE;
-	}
-
-
-
-	// Populate tokens
-	char *tokens[64];
-	int idx = 0;
-	for(char* cur = strtok(buffer, STRING_DELIMITER); cur != NULL; cur=strtok(NULL, STRING_DELIMITER)) { 
-#ifdef DBG_LINE
-		printf("%s ", cur);
-#endif
-		tokens[idx] = cur;
-		idx++;
-	}
-
-	// Handling director changes
-	int cd_result = cd_handler(tokens, idx);
-	if(cd_result != CD_NOP) {
-		return cd_result;
-	}
-
-	// Execute child process
-	pid_t child = fork();
-	if(child != 0) {
-		int status_child = wait(NULL);
-		if(status_child == 127) {
-			printf("msh: %s: %d", tokens[0], status_child);
-		}
-	}
-	else {
-		execvp(tokens[0], tokens);
-	}
-	// Cleanup pointers
-	for(int i = 0; i< 64; i++) {
-		tokens[i] = NULL;
-	}
-
-}
-
-int cd_handler(char** tokens, const int t_count) {
-	if(!strcmp(tokens[0], "cd")) {
-		if(t_count < 2) {
-			int ret = chdir(getenv("HOME"));
-			return ret;
-		}
-		return chdir(tokens[1]);
-	}
-	return CD_NOP;
-}