1 files changed, 55 insertions, 0 deletions
diff --git a/src/strbuf.c b/src/strbuf.c
new file mode 100644
index 0000000..13e4553
--- /dev/null
+++ b/src/strbuf.c
@@ -0,0 +1,55 @@
+#include "strbuf.h"
+
+#include "util.h"
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+
+void
+strbuf_init(struct strbuf *strbuf)
+{
+	strbuf->buf = NULL;
+	strbuf->cap = 0;
+}
+
+void
+strbuf_deinit(struct strbuf *strbuf)
+{
+	free(strbuf->buf);
+}
+
+void
+strbuf_clear(struct strbuf *strbuf)
+{
+	if (!strbuf->buf)
+		strbuf_append(strbuf, "");
+
+	strbuf->buf[0] = '\0';
+}
+
+void
+strbuf_append(struct strbuf *strbuf, const char *fmt, ...)
+{
+	va_list ap, cpy;
+	int blen, slen;
+
+	va_copy(cpy, ap);
+
+	blen = strbuf->buf ? strlen(strbuf->buf) : 0;
+
+	va_start(cpy, fmt);
+	slen = vsnprintf(NULL, 0, fmt, cpy);
+	ASSERT(slen >= 0);
+	va_end(cpy);
+
+	if (blen + slen + 1 > strbuf->cap) {
+		strbuf->cap = blen + slen + 1;
+		strbuf->buf = realloc(strbuf->buf, strbuf->cap);
+		OOM_CHECK(strbuf->buf);
+	}
+
+	va_start(ap, fmt);
+	vsnprintf(strbuf->buf + blen, slen + 1, fmt, ap);
+	va_end(ap);
+}