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// SPDX-License-Identifier: GPL-2.0+
/*
* Handles a buffer that can be allocated and freed
*
* Copyright 2021 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#ifndef USE_HOSTCC
#include <malloc.h>
#include <mapmem.h>
#include <string.h>
#include <vsprintf.h>
#endif
#include <errno.h>
#include <stdarg.h>
#include <abuf.h>
void abuf_set(struct abuf *abuf, void *data, size_t size)
{
abuf_uninit(abuf);
abuf->data = data;
abuf->size = size;
}
#ifndef USE_HOSTCC
void abuf_map_sysmem(struct abuf *abuf, ulong addr, size_t size)
{
abuf_set(abuf, map_sysmem(addr, size), size);
}
ulong abuf_addr(const struct abuf *abuf)
{
return map_to_sysmem(abuf->data);
}
#else
/* copied from lib/string.c for convenience */
static char *memdup(const void *src, size_t len)
{
char *p;
p = malloc(len);
if (!p)
return NULL;
memcpy(p, src, len);
return p;
}
#endif
bool abuf_realloc(struct abuf *abuf, size_t new_size)
{
void *ptr;
if (!new_size) {
/* easy case, just need to uninit, freeing any allocation */
abuf_uninit(abuf);
return true;
} else if (abuf->alloced) {
/* currently allocated, so need to reallocate */
ptr = realloc(abuf->data, new_size);
if (!ptr)
return false;
abuf->data = ptr;
abuf->size = new_size;
return true;
} else if (new_size <= abuf->size) {
/*
* not currently alloced and new size is no larger. Just update
* it. Data is lost off the end if new_size < abuf->size
*/
abuf->size = new_size;
return true;
} else {
/* not currently allocated and new size is larger. Alloc and
* copy in data. The new space is not inited.
*/
ptr = malloc(new_size);
if (!ptr)
return false;
if (abuf->size)
memcpy(ptr, abuf->data, abuf->size);
abuf->data = ptr;
abuf->size = new_size;
abuf->alloced = true;
return true;
}
}
bool abuf_realloc_inc(struct abuf *abuf, size_t inc)
{
return abuf_realloc(abuf, abuf->size + inc);
}
void *abuf_uninit_move(struct abuf *abuf, size_t *sizep)
{
void *ptr;
if (sizep)
*sizep = abuf->size;
if (!abuf->size)
return NULL;
if (abuf->alloced) {
ptr = abuf->data;
} else {
ptr = memdup(abuf->data, abuf->size);
if (!ptr)
return NULL;
}
/* Clear everything out so there is no record of the data */
abuf_init(abuf);
return ptr;
}
void abuf_init_set(struct abuf *abuf, void *data, size_t size)
{
abuf_init(abuf);
abuf_set(abuf, data, size);
}
bool abuf_init_size(struct abuf *buf, size_t size)
{
abuf_init(buf);
if (!abuf_realloc(buf, size))
return false;
return true;
}
bool abuf_copy(const struct abuf *old, struct abuf *copy)
{
char *data;
data = malloc(old->size);
if (!data)
return false;
memcpy(data, old->data, old->size);
abuf_init_set(copy, data, old->size);
copy->alloced = true;
return true;
}
int abuf_printf(struct abuf *buf, const char *fmt, ...)
{
int maxlen = buf->size;
va_list args;
int len;
va_start(args, fmt);
len = vsnprintf(buf->data, buf->size, fmt, args);
va_end(args);
/* add the terminator */
len++;
if (len > 4096)
return -E2BIG;
if (len > maxlen) {
/* make more space and try again */
maxlen = len;
if (!abuf_realloc(buf, maxlen))
return -ENOMEM;
va_start(args, fmt);
len = vsnprintf(buf->data, maxlen, fmt, args);
va_end(args);
/* check there isn't anything strange going on */
if (len > maxlen)
return -EFAULT;
}
return len;
}
void abuf_init_const(struct abuf *abuf, const void *data, size_t size)
{
/* for now there is no flag indicating that the abuf data is constant */
abuf_init_set(abuf, (void *)data, size);
}
void abuf_init_move(struct abuf *abuf, void *data, size_t size)
{
abuf_init_set(abuf, data, size);
abuf->alloced = true;
}
void abuf_uninit(struct abuf *abuf)
{
if (abuf->alloced)
free(abuf->data);
abuf_init(abuf);
}
void abuf_init(struct abuf *abuf)
{
abuf->data = NULL;
abuf->size = 0;
abuf->alloced = false;
}
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