initial

src/str.c

@@ -0,0 +1,46 @@
+#include <u.h>
+#include <libc.h>
+#include "str.h"
+
+void str_buf_clear(Str_Buf *buf)
+{
+	buf->length = 0;
+}
+
+void str_buf_delete(Str_Buf *buf)
+{
+	if(buf->contents)
+	{
+		free(buf->contents);
+		buf->contents = 0;
+	}
+	buf->length = buf->capacity = 0;
+}
+
+void str_buf_push_char(Str_Buf *buf, char ch)
+{
+	if(buf->length == buf->capacity)
+	{
+		uintptr new_capacity = buf->capacity ? buf->capacity * 2 : 8;
+		char *new_contents = malloc(new_capacity);
+		memcpy(new_contents, buf->contents, buf->length);
+		if(buf->contents)
+			free(buf->contents);
+		buf->contents = new_contents;
+		buf->capacity = new_capacity;
+	}
+	buf->contents[buf->length++] = ch;
+}
+
+void str_buf_append_cstr(Str_Buf *buf, const char *str)
+{
+	while(*str)
+		str_buf_push_char(buf, *(str++));
+}
+
+char *str_buf_to_cstr(Str_Buf *buf)
+{
+	str_buf_push_char(buf, 0);
+	buf->length--;
+	return buf->contents;
+}