From c642a88fe64593799d35db3bbc55ab5659ec6734 Mon Sep 17 00:00:00 2001
From: shockrah <alejandros714@protonmail.com>
Date: Sun, 15 Sep 2019 23:45:47 -0700
Subject: [PATCH] base for h3

---
 334/homework/3/chap5.txt | 14 +++++++++++++
 334/homework/3/chap6.txt | 14 +++++++++++++
 334/homework/3/msh.c     | 43 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+)
 create mode 100644 334/homework/3/chap5.txt
 create mode 100644 334/homework/3/chap6.txt
 create mode 100644 334/homework/3/msh.c

diff --git a/334/homework/3/chap5.txt b/334/homework/3/chap5.txt
new file mode 100644
index 0000000..a98d582
--- /dev/null
+++ b/334/homework/3/chap5.txt
@@ -0,0 +1,14 @@
+#
+# 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
diff --git a/334/homework/3/chap6.txt b/334/homework/3/chap6.txt
new file mode 100644
index 0000000..c874cce
--- /dev/null
+++ b/334/homework/3/chap6.txt
@@ -0,0 +1,14 @@
+#
+# 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
diff --git a/334/homework/3/msh.c b/334/homework/3/msh.c
new file mode 100644
index 0000000..956d3de
--- /dev/null
+++ b/334/homework/3/msh.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define PROMPT "msh> "
+#define EXIT_CMD "exit"
+#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
+}