Some fixes.

cms_err.c

@@ -1,41 +0,0 @@
-#include "cms_err.h"
-#include <stdio.h>
-#include <unistd.h>
-
-static char* get_message(cms_err err)
-{
-	switch (err)
-	{
-	case CMS_ERR_NONE:
-		return "";
-	case CMS_ERR_UNKNOWN:
-		return "Unknown error.";
-	case CMS_ERR_MEMORY:
-		return "Memory allocation failed.";
-	case CMS_ERR_PARSE:
-		return "Parse error.";
-	case CMS_ERR_FILENOENT:
-		return "File doesn't exist.";
-	case CMS_ERR_DIRNOENT:
-		return "Directory doesn't exist.";
-	case CMS_ERR_NOTFILE:
-		return "Not a file.";
-	case CMS_ERR_NOTDIR:
-		return "Not a directory.";
-	case CMS_ERR_PERM:
-		return "Permission denied.";
-	}
-}
-
-void cms_err_panic(cms_err err, char* msg)
-{
-	if (err == CMS_ERR_NONE)
-		return;
-
-	if (msg == NULL)
-		printf("Error: %s\n", get_message(err));
-	else
-		printf("Error: %s (%s)\n", get_message(err), msg);
-
-	exit(1);
-}

src/cms_util.c

@@ -15,12 +15,15 @@ int cms_util_file_exists(char* fname)
 {
 	int f = open(fname, O_RDONLY);
 
-	close(f);
-
-	if (errno == ENOENT)
+	//The file doesn't exist if the open command returned the ENOENT error.
+	if (f == -1 && errno == ENOENT)
 		return 0;
-	else
-		return 1;
+
+	//If the open command succeeded, we want to close the file descriptor.
+	else if (f != -1)
+		close(f);
+
+	return 1;
 }
 
 cms_err cms_util_file_create(char* fname)

src/main.c

@@ -13,7 +13,8 @@ int main(int argc, char** argv)
 		return 1;
 	}
 
-	if (strcmp(argv[1], "init") == 0) //Initiate directory
+	//Initiate
+	if (strcmp(argv[1], "init") == 0)
 	{
 		if (argc != 3)
 		{
@@ -35,8 +36,15 @@ int main(int argc, char** argv)
 		cms_util_file_create(initedPath);
 	}
 
-	else if (strcmp(argv[1], "build") == 0) //Build
+	//Build
+	else if (strcmp(argv[1], "build") == 0)
 	{
+		if (argc != 3)
+		{
+			fprintf(stderr, "Usage: %s build <directory>\n", argv[0]);
+			return 1;
+		}
+
 		char* dirname = argv[2];
 
 		//Get the path of .cmsinited, which tells us