redid structure for 334 keeping things clean now

334/homework/1/bindec.c

@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// max length input string
+#define MAXSTR 25
+
+// convert input binary string to a number
+int bindec(char*, size_t);
+
+int main() {
+
+   // user input string
+   char s[MAXSTR+3]; 
+
+   // prompt for input
+   printf("> ");
+
+   // read input string; at most MAXSTR+1 chars accepted
+   // Note: this is tricky. If we accept only MAXSTR chars,
+   // we can't see if user entered more chars and they are
+   // being dropped by fgets.
+   fgets(s, MAXSTR+3, stdin);
+
+   // check input length; n does not include final carriage return
+   int n = strlen(s)-1;  
+   if (n > MAXSTR) {
+     printf("input cannot be more than %d characters\n", MAXSTR);
+     exit(1);
+   }
+
+   for(size_t i = 0; i < n; i++) {
+	   if(s[i] == '0' || s[i] == '1') {
+		   continue;
+	   }
+	   else {
+		   printf("input must contain only zeros and ones\n");
+		   exit(1);
+	   }
+   }
+   if(!n) {
+	   printf("No input given only hit enter\n");
+	   exit(1);
+   }
+
+   int output = bindec(s, MAXSTR);
+   printf("%d\n", output);
+
+   return 0;
+}
+
+int bindec(char* buf, size_t len) {
+	int ret = 0;
+	for(size_t i = 0; i < len; i++) {
+		if(buf[i] == '1') {
+			ret <<= 1;
+			ret++;
+		}
+		else {
+			ret <<= 0;
+		}
+	}
+	return ret;
+}

334/homework/1/binhex.txt

@@ -0,0 +1,47 @@
+
+# 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

@@ -0,0 +1,19 @@
+
+# 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/msh.c

@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define PROMPT "msh> "
+#define EXIT_CMD "exit"
+// Accounting for the \n
+#define MAX_BUF 121
+
+void echo(const char*);
+void remove_newline(char*);
+void exit_branch(const char*);
+
+int main(void) {
+	char buffer[MAX_BUF];
+	while(1) {
+		printf("%s", PROMPT);
+		fgets(buffer, MAX_BUF, stdin);
+		// process the input
+		remove_newline(buffer);
+		exit_branch(buffer);
+		echo(buffer);
+	}
+	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)) {
+		return;
+	}
+	exit(0);
+	return; // just for gcc but exit shouldn't fail
+}

334/homework/2/processes.txt

@@ -0,0 +1,22 @@
+# 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

@@ -0,0 +1,32 @@
+# 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