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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;
}
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