new utility functions, started init functionality

src/cms_util.c

+#include <fcntl.h>
+#include <unistd.h>
 #include <stdio.h>
 #include <stddef.h>
 #include <string.h>
 #include <stdlib.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <errno.h>
 
 #include "cms_util.h"
 
 int cms_util_file_exists(char* fname)
 {
-	FILE* f;
-	if (f = fopen(fname, "r"))
-	{
-		fclose(f);
+	int f = open(fname, O_RDONLY);
+
+	if (errno == ENOENT)
+		return 0;
+	else
 		return 1;
-	}
 
-	return 0;
+	close(f);
 }
 
 void cms_util_file_create(char* fname)
 {
-	FILE* f = fopen(fname, "ab+");
-	fclose(f);
+	int f = open(fname, O_CREAT);
+	close(f);
+}
+
+int cms_util_file_copy(char* fname1, char* fname2)
+{
+	int f1 = open(fname1, O_RDONLY);
+	int f2 = open(fname2, O_WRONLY);
+
+	struct stat* s = malloc(sizeof(struct stat));
+	if (s == NULL)
+		return 1;
+
+	fstat(f1, s);
+
+	void* buf = malloc(s->st_size);
+	if (buf == NULL)
+		return 1;
+
+	read(f1, buf, s->st_size);
+	write(f2, buf, s->st_size);
+
+	close(f1);
+	close(f2);
+
+	free(s);
+	free(buf);
+
+	return 0;
+}
+
+int cms_util_dir_copy_recursive(char* dir1, char* dir2)
+{
+	mkdir(dir2, 0777);
+	DIR* dp = opendir(dir1);
+
+	struct dirent* ep;
+
+	if (dp == NULL)
+		return 1;
+
+	while (ep = readdir(dp))
+	{
+		char* path1 = cms_util_path_join(dir1, ep->d_name);
+		char* path2 = cms_util_path_join(dir2, ep->d_name);
+		struct stat* s = malloc(sizeof(struct stat));
+		stat(path1, s);
+
+		if (S_ISDIR(s->st_mode))
+		{
+			cms_util_dir_copy_recursive(path1, path2);
+		}
+		else
+		{
+			cms_util_file_copy(path1, path2);
+		}
+
+		free(s);
+	}
+
+	return 0;
 }
 
-char* cms_util_join_paths(char* str1, char* str2)
+char* cms_util_path_join(char* str1, char* str2)
 {
 	size_t len1 = strlen(str1);
 	size_t len2 = strlen(str2);

src/cms_util.h

 #ifndef CMS_UTIL_H
 #define CMS_UTIL_H
 
-//Returns 1 if a file exists, 0 if it doesn't.
+//Return 1 if a file exists, 0 if it doesn't
 int cms_util_file_exists(char* fname);
 
 //Create a file
 void cms_util_file_create(char* fname);
 
-//Joins together two paths.
-char* cms_util_join_paths(char* str1, char* str2);
+//Copy a file
+int cms_util_file_copy(char* fname1, char* fname2);
+
+//Recursively copy a directory
+int cms_util_dir_copy_recursive(char* dir1, char* dir2);
+
+//Join together two paths
+char* cms_util_path_join(char* str1, char* str2);
 
 #endif

src/main.c

 
 		//Get the path of .cmsinited, which tells us
 		//whether or not the directory is already inited
-		char* initedPath = cms_util_join_paths(dirname, CMS_FILE_INITED);
+		char* initedPath = cms_util_path_join(dirname, CMS_FILE_INITED);
 		if (initedPath == NULL)
 			cms_log_panic("Memory allocation failed.");