#include <stdlib.h>
#include "buf.h"
#include "err.h"

void buf_init(struct buf *b, size_t n) {
	b->buf = calloc(1, n);
	if (!b->buf) {
		efatal("buf_init");
	}
	b->cap = n;
	b->sz = 0;
}

void buf_grow(struct buf *b, size_t n) {
	size_t sz = b->sz + n;
	size_t c = b->cap;
	if (sz > c) {
		while (sz > c) c <<= 1;
		char *p = realloc(b->buf, c);
		if (!p) efatal("buf_grow");
		b->buf = p;
		b->cap = c;
	}
}

void buf_free(struct buf *b) {
	free(b->buf);
}