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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* Copyright (C) 2011-2013 ProFUSION embedded systems
* Copyright (C) 2014 Intel Corporation. All rights reserved.
*/
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include "util.h"
#include "strbuf.h"
#define BUF_STEP 128
static bool buf_realloc(struct strbuf *buf, size_t sz)
{
void *tmp = realloc(buf->heap ? buf->bytes : NULL, sz);
if (sz > 0) {
if (tmp == NULL)
return false;
if (!buf->heap)
memcpy(tmp, buf->bytes, MIN(buf->size, sz));
}
buf->heap = true;
buf->bytes = tmp;
buf->size = sz;
return true;
}
bool strbuf_reserve_extra(struct strbuf *buf, size_t n)
{
if (uaddsz_overflow(buf->used, n, &n) || n > SIZE_MAX - BUF_STEP)
return false;
if (n <= buf->size)
return true;
if (n % BUF_STEP)
n = ((n / BUF_STEP) + 1) * BUF_STEP;
return buf_realloc(buf, n);
}
void strbuf_init(struct strbuf *buf)
{
buf->bytes = NULL;
buf->size = 0;
buf->used = 0;
buf->heap = true;
}
void strbuf_release(struct strbuf *buf)
{
if (buf->heap)
free(buf->bytes);
}
char *strbuf_steal(struct strbuf *buf)
{
char *bytes;
if (!buf_realloc(buf, buf->used + 1))
return NULL;
bytes = buf->bytes;
buf->bytes = NULL;
bytes[buf->used] = '\0';
return bytes;
}
const char *strbuf_str(struct strbuf *buf)
{
if (!buf->used || buf->bytes[buf->used - 1]) {
if (!strbuf_reserve_extra(buf, 1))
return NULL;
buf->bytes[buf->used] = '\0';
}
return buf->bytes;
}
bool strbuf_pushchar(struct strbuf *buf, char ch)
{
if (!strbuf_reserve_extra(buf, 1))
return false;
buf->bytes[buf->used] = ch;
buf->used++;
return true;
}
size_t strbuf_pushmem(struct strbuf *buf, const char *src, size_t sz)
{
assert(src != NULL);
assert(buf != NULL);
if (sz == 0)
return 0;
if (!strbuf_reserve_extra(buf, sz))
return 0;
memcpy(buf->bytes + buf->used, src, sz);
buf->used += sz;
return sz;
}
void strbuf_popchar(struct strbuf *buf)
{
assert(buf->used > 0);
buf->used--;
}
void strbuf_popchars(struct strbuf *buf, size_t n)
{
assert(buf->used >= n);
buf->used -= n;
}
void strbuf_shrink_to(struct strbuf *buf, size_t sz)
{
assert(buf->used >= sz);
buf->used = sz;
}
void strbuf_clear(struct strbuf *buf)
{
buf->used = 0;
}
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