1136 - switch from ncurses to https://github.com/nsf/termbox

1 files changed, 78 insertions, 0 deletions

diff --git a/cpp/termbox/bytebuffer.inl b/cpp/termbox/bytebuffer.inl
new file mode 100644
index 00000000..c476742d
--- /dev/null
+++ b/cpp/termbox/bytebuffer.inl
@@ -0,0 +1,78 @@
+struct bytebuffer {
+	char *buf;
+	int len;
+	int cap;
+};
+
+static void bytebuffer_reserve(struct bytebuffer *b, int cap) {
+	if (b->cap >= cap) {
+		return;
+	}
+
+	// prefer doubling capacity
+	if (b->cap * 2 >= cap) {
+		cap = b->cap * 2;
+	}
+
+	char *newbuf = malloc(cap);
+	if (b->len > 0) {
+		// copy what was there, b->len > 0 assumes b->buf != null
+		memcpy(newbuf, b->buf, b->len);
+	}
+	if (b->buf) {
+		// in case there was an allocated buffer, free it
+		free(b->buf);
+	}
+	b->buf = newbuf;
+	b->cap = cap;
+}
+
+static void bytebuffer_init(struct bytebuffer *b, int cap) {
+	b->cap = 0;
+	b->len = 0;
+	b->buf = 0;
+
+	if (cap > 0) {
+		b->cap = cap;
+		b->buf = malloc(cap); // just assume malloc works always
+	}
+}
+
+static void bytebuffer_free(struct bytebuffer *b) {
+	if (b->buf)
+		free(b->buf);
+}
+
+static void bytebuffer_clear(struct bytebuffer *b) {
+	b->len = 0;
+}
+
+static void bytebuffer_append(struct bytebuffer *b, const char *data, int len) {
+	bytebuffer_reserve(b, b->len + len);
+	memcpy(b->buf + b->len, data, len);
+	b->len += len;
+}
+
+static void bytebuffer_puts(struct bytebuffer *b, const char *str) {
+	bytebuffer_append(b, str, strlen(str));
+}
+
+static void bytebuffer_resize(struct bytebuffer *b, int len) {
+	bytebuffer_reserve(b, len);
+	b->len = len;
+}
+
+static void bytebuffer_flush(struct bytebuffer *b, int fd) {
+	write(fd, b->buf, b->len);
+	bytebuffer_clear(b);
+}
+
+static void bytebuffer_truncate(struct bytebuffer *b, int n) {
+	if (n <= 0)
+		return;
+	if (n > b->len)
+		n = b->len;
+	const int nmove = b->len - n;
+	memmove(b->buf, b->buf+n, nmove);
+	b->len -= n;
+}