5800 - move `browse_trace` to `tools/` dir

1 files changed, 79 insertions, 0 deletions

diff --git a/tools/termbox/bytebuffer.inl b/tools/termbox/bytebuffer.inl
new file mode 100644
index 00000000..aae8f073
--- /dev/null
+++ b/tools/termbox/bytebuffer.inl
@@ -0,0 +1,79 @@
+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) {
+  int yyy = write(fd, b->buf, b->len);
+  (void) yyy;
+  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;
+}