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// Copyright 2023 Alejandro Colomar <alx@kernel.org>
// SPDX-License-Identifier: LGPL-3.0-or-later WITH LGPL-3.0-linking-exception
#ifndef INCLUDE_C_STR_CPY_STP_STPE_USTR2STPE_H_
#define INCLUDE_C_STR_CPY_STP_STPE_USTR2STPE_H_
#include <stdbool.h>
#include <stddef.h>
#include <sys/param.h>
#include <c/branch/likely.h>
#include <c/branch/unreachable.h>
#include <c/mem/cpy/mempcpy.h>
#include <c/qual/nullable/nullable.h>
#include <c/str/len/strlen.h>
#pragma clang assume_nonnull begin
inline char *c_nullable c_ustr2stpe(char *c_nullable dst, char *end,
const char *restrict src, size_t slen);
inline char *c_nullable
c_ustr2stpe(char *c_nullable dst, char *end, const char *restrict src,
size_t slen)
{
bool trunc;
size_t dsize, dlen;
if (dst == end)
return end;
if (c_unlikely(dst == NULL)) // Allow chaining with stpeprintf().
return NULL;
c_impossible(dst > end);
dsize = end - dst;
trunc = (slen > dsize - 1);
dlen = MIN(slen, dsize - 1);
dst[dlen] = '\0';
return c_mempcpy(dst, src, dlen) + trunc;
}
#pragma clang assume_nonnull end
#endif // Header guard
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