libite: Improve error handling for copyfile() and rsync()

When using the simple rsync() or copyfile() functions of libite some
error codes should not be interpreted as error.  I.e., if a file or
directory already exists when attempting to create it.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

copyfile.c

@@ -179,6 +179,7 @@ int copy_filep(FILE *src, FILE *dst)
 		return errno;
 
 	while (1) {
+      errno = 0;
 		if (!fgets(buf, BUFSIZ, src)) {
 			if (errno == EINTR) {
 				clearerr(src);

rsync.c

@@ -62,7 +62,12 @@ int rsync(char *src, char *dst, int delete, int (*filter) (const char *file))
 	{
 		errno = 0;
 		copyfile(src, dst, 0);
-		if (errno) result++;
+		if (errno) {
+			if (errno == EEXIST)
+				errno = 0;
+			else
+				result++;
+		}
 	}
 
 	if (!fisdir(dst))
@@ -127,8 +132,12 @@ int rsync(char *src, char *dst, int delete, int (*filter) (const char *file))
 static int makedir(char *buf, size_t buf_len, char *dir, char *name, mode_t mode)
 {
 	snprintf(buf, buf_len, "%s%s%s/", dir, fisslashdir(dir) ? "" : "/", name);
-	if (mkdir(buf, mode))
+	if (mkdir(buf, mode)) {
-		return 1;
+		if (EEXIST != errno)
+			return 1;
+
+		errno = 0;
+	}
 
 	return 0;
 }