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/*
* SPDX-FileCopyrightText: 2023, Alejandro Colomar <alx@kernel.org>
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef SHADOW_INCLUDE_LIB_STRTCPY_H_
#define SHADOW_INCLUDE_LIB_STRTCPY_H_
#include <config.h>
#include <stdbool.h>
#include <stddef.h>
#include <string.h>
#include <sys/types.h>
#include "attr.h"
#include "defines.h"
#include "sizeof.h"
/*
* SYNOPSIS
* [[gnu::null_terminated_string_arg(2)]]
* int STRTCPY(char dst[restrict], const char *restrict src);
*
* ARGUMENTS
* dst Destination buffer where to copy a string.
* src Source string to be copied into dst.
*
* DESCRIPTION
* This macro copies the string pointed to by src, into a string
* at the buffer pointed to by dst. If the destination buffer,
* isn't large enough to hold the copy, the resulting string is
* truncated. The size of the buffer is calculated internally via
* NITEMS().
*
* RETURN VALUE
* -1 If this call truncated the resulting string.
*
* strlen(dst)
* On success.
*
* ERRORS
* This function doesn't set errno.
*/
#define STRTCPY(dst, src) strtcpy(dst, src, NITEMS(dst))
ATTR_STRING(2)
inline ssize_t strtcpy(char *restrict dst, const char *restrict src,
size_t dsize);
inline ssize_t
strtcpy(char *restrict dst, const char *restrict src, size_t dsize)
{
bool trunc;
size_t dlen, slen;
if (dsize == 0)
return -1;
slen = strnlen(src, dsize);
trunc = (slen == dsize);
dlen = slen - trunc;
stpcpy(mempcpy(dst, src, dlen), "");
if (trunc)
return -1;
return slen;
}
#endif // include guard
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