#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;
}