shared: memmove

2 files changed, 13 insertions, 2 deletions

diff --git a/src/user/app/tests/libc/string.c b/src/user/app/tests/libc/string.c
index f865d72..2e00049 100644
--- a/src/user/app/tests/libc/string.c
+++ b/src/user/app/tests/libc/string.c
@@ -38,6 +38,17 @@ static void test_memset(void) {
 	free(buf);
 }
 
+static void test_memmove(void) {
+	const int partsize = 64;
+	char buf[partsize * 3];
+	for (int i = 0; i < partsize * 2; i++) {
+		memset(buf, 0, sizeof buf);
+		for (int j = 0; j < partsize; j++) buf[i + j] = j;
+		memmove(buf + partsize, buf + i, partsize);
+		for (int j = 0; j < partsize; j++) test(buf[partsize + j] == j);
+	}
+}
+
 static void test_strcmp(void) {
 	test(0 == strcmp("string", "string"));
 	test(0 > strcmp("str", "string"));
@@ -102,6 +113,7 @@ static void test_strtok(void) {
 void r_libc_string(void) {
 	run_test(test_memcmp);
 	run_test(test_memset);
+	run_test(test_memmove);
 	run_test(test_strcmp);
 	run_test(test_strtol);
 	run_test(test_strspn);
diff --git a/src/user/app/vterm/draw.c b/src/user/app/vterm/draw.c
index 50c56ed..ee36a0f 100644
--- a/src/user/app/vterm/draw.c
+++ b/src/user/app/vterm/draw.c
@@ -7,9 +7,8 @@ struct framebuf fb;
 struct rect dirty;
 
 void scroll(void) {
-	// TODO memmove. this is UD
 	size_t row_len = fb.pitch * font.h;
-	memcpy(fb.b, fb.b + row_len, fb.len - row_len);
+	memmove(fb.b, fb.b + row_len, fb.len - row_len);
 	memset(fb.b + fb.len - row_len, 0, row_len);
 	cursor.y--;