wip

.gitignore

@@ -1 +1,2 @@
 *.out
+bin/

Makefile

@@ -1,9 +1,18 @@
 LIBRARIES = -lreadline
 RELEASE_ARGS = -DRELEASEBUILD
 SOURCES = ./msh.c
+OUTPUT_DIR = ./bin
+OUTPUT_BIN = ${OUTPUT_DIR}/PROG
+OUTPUT = -o ${OUTPUT_BIN}
 
-build:
-	gcc -Wall -std=gnu99 ${RELEASE_ARGS} ${SOURCES} ${LIBRARIES}
+build: output_dir
+	gcc -Wall -std=gnu99 ${RELEASE_ARGS} ${SOURCES} ${LIBRARIES} ${OUTPUT:PROG=mash}
 
-debug:
-	gcc -Wall -std=gnu99 ${SOURCES} ${LIBRARIES}
+debug: output_dir
+	gcc -Wall -std=gnu99 ${SOURCES} ${LIBRARIES} ${OUTPUT:PROG=mash}
+
+output_dir:
+	mkdir -p ${OUTPUT_DIR}
+
+install: build
+	mv ${OUTPUT:PROG=mash} /usr/sbin/mash

README.md

@@ -0,0 +1,10 @@
+**IMPORTANT** this shell is **NOT** meant to be used for any serious applications.
+This is for academic purposes only!
+
+## Install
+
+```
+make
+make install
+```
+

msh.c

@@ -10,6 +10,7 @@
 #include "msh.h"
 
 #define clear() printf("\033[H\033[J")
+#define MATHLEN 10
 
 union pipe {
 	int fileDesc[2];
@@ -21,12 +22,14 @@ union pipe {
 
 static char *builtinFunctions[] = {
 	"exit",
-	"author"
+	"author",
+	"cd"
 };
 
-int (*builtinFunc[]) (char *) = {
+int (*builtinFunc[]) (char **) = {
 	&builtinExit,
-	&builtinAuthor
+	&builtinAuthor,
+	&builtinCD
 };
 
 int builtinExit() {
@@ -43,6 +46,20 @@ int builtinAuthor() {
 	return 0;
 }
 
+int builtinCD(char **dir) {
+	int status = 0;
+	if (dir != NULL) {
+		if (chdir(dir[1]) != 0) {
+			status = 1;
+			printf("bash: cd: error\n");
+		}
+	} else {
+		status = 1;
+		printf("bash: cd: error\n");
+	}
+	return status;
+}
+
 void failedTest() {
 	static const char* message =
 		"\n"
@@ -74,10 +91,39 @@ int runCommand(char *command) {
 	return status;
 }
 
+char **splitCMD(char *line) {
+        size_t size = 8;
+        size_t pos = 0;
+        char **args = calloc(0, size * sizeof(char*));
+        char *arg = NULL;
+
+        if(line == NULL) {
+                *args=NULL;
+                return args;
+        }
+
+        arg = strtok(line, " \t\r\n\a");
+        while (arg != NULL) {
+                args[pos] = arg;
+                pos++;
+
+                if (pos >= size) {
+                        size += 1;
+                        args = realloc(args, size * sizeof(char*));
+
+                }
+                arg = strtok(NULL, " \t\r\n\a");
+        }
+
+        args[pos] = NULL;
+        return args;
+}
+
 int execCommand(char *command) {
+	char **commandARGS = splitCMD(command);
 	for (size_t i = 0; i < (sizeof(builtinFunctions) / sizeof(char *)); i++) {
-		if (strcmp(command, builtinFunctions[i]) == 0) {
-			return (*builtinFunc[i])(command);
+		if (strcmp(commandARGS[0], builtinFunctions[i]) == 0) {
+			return (*builtinFunc[i])(commandARGS);
 		}
 	}
 	return runCommand(command);
@@ -92,6 +138,7 @@ void initShell() {
 	// Setting random time seed
 	srand(time(0));
 
+	fflush(stdout);
 	runCommand("uname -a");
 
 	fd = fopen("/etc/motd", "r");
@@ -104,10 +151,10 @@ void initShell() {
 			c = fgetc(fd);
 		}
 		fclose(fd);
-	} else {
-		printf("MOTD is empty\n");
 	}
 
+	printf("\n");
+
 	return;
 }
 
@@ -178,8 +225,8 @@ int randomNum(int limit) {
 int mathTest() {
 	int status = 0;
 	int numAnswer = 0;
-	int num1 = randomNum(10);
-	int num2 = randomNum(10);
+	int num1 = randomNum(MATHLEN);
+	int num2 = randomNum(MATHLEN);
 	char *numLine = NULL;
 	printf("%d + %d = ", num1, num2);
 	numLine = readline("");

msh.h

@@ -1,2 +1,3 @@
 int builtinExit();
 int builtinAuthor();
+int builtinCD(char **dir);