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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2016-2018 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "sudo_compat.h"
#include "sudo_debug.h"
#include "sudo_util.h"
/* Trivial reference-counted strings. */
struct rcstr {
int refcnt;
char str[1]; /* actually bigger */
};
/*
* Allocate a reference-counted string and copy src to it.
* Returns the newly-created string with a refcnt of 1.
*/
char *
sudo_rcstr_dup(const char *src)
{
size_t len = strlen(src);
char *dst;
debug_decl(sudo_rcstr_dup, SUDO_DEBUG_UTIL);
dst = sudo_rcstr_alloc(len);
if (dst != NULL) {
memcpy(dst, src, len);
dst[len] = '\0';
}
debug_return_ptr(dst);
}
char *
sudo_rcstr_alloc(size_t len)
{
struct rcstr *rcs;
debug_decl(sudo_rcstr_dup, SUDO_DEBUG_UTIL);
/* Note: sizeof(struct rcstr) includes space for the NUL */
rcs = malloc(sizeof(struct rcstr) + len);
if (rcs == NULL)
return NULL;
rcs->refcnt = 1;
rcs->str[0] = '\0';
/* cppcheck-suppress memleak */
debug_return_ptr(rcs->str); // -V773
}
char *
sudo_rcstr_addref(const char *s)
{
struct rcstr *rcs;
debug_decl(sudo_rcstr_dup, SUDO_DEBUG_UTIL);
if (s == NULL)
debug_return_ptr(NULL);
rcs = __containerof((const void *)s, struct rcstr, str);
rcs->refcnt++;
debug_return_ptr(rcs->str);
}
void
sudo_rcstr_delref(const char *s)
{
struct rcstr *rcs;
debug_decl(sudo_rcstr_dup, SUDO_DEBUG_UTIL);
if (s != NULL) {
rcs = __containerof((const void *)s, struct rcstr, str);
if (--rcs->refcnt == 0) {
rcs->str[0] = '\0';
free(rcs);
}
}
debug_return;
}
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