fc8389331e
By writing the terminating null byte via stpcpy(3), we take advantage of _FORTIFY_SOURCE for the last byte, which was unprotected before this commit. Reported-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Alejandro Colomar <alx@kernel.org>
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/*
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* SPDX-FileCopyrightText: 2022-2023, Alejandro Colomar <alx@kernel.org>
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef SHADOW_INCLUDE_LIBMISC_ZUSTR2STP_H_
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#define SHADOW_INCLUDE_LIBMISC_ZUSTR2STP_H_
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#include <config.h>
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#include <assert.h>
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#include <stddef.h>
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#include <string.h>
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#include "must_be.h"
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#include "sizeof.h"
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#define ZUSTR2STP(dst, src) \
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({ \
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static_assert(!is_array(dst) || sizeof(dst) > SIZEOF_ARRAY(src), ""); \
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\
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zustr2stp(dst, src, NITEMS(src)); \
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})
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inline char *zustr2stp(char *restrict dst, const char *restrict src, size_t sz);
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/*
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* SYNOPSIS
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* char *zustr2stp(char *restrict dst,
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* const char src[restrict .sz], size_t sz);
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*
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* ARGUMENTS
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* dst Destination buffer where to copy a string.
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*
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* src Source null-padded character sequence to be copied into
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* dst.
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*
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* sz Size of the *source* buffer.
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*
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* DESCRIPTION
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* This function copies the null-padded character sequence pointed
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* to by src, into a string at the buffer pointed to by dst.
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*
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* RETURN VALUE
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* dst + strlen(dst)
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* This function returns a pointer to the terminating NUL
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* byte.
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*
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* ERRORS
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* This function doesn't set errno.
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*
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* CAVEATS
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* This function doesn't know the size of the destination buffer.
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* It assumes it will always be large enough. Since the size of
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* the source buffer is known to the caller, it should make sure to
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* allocate a destination buffer of at least `sz + 1`.
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*
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* EXAMPLES
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* char src[13] = "Hello, world!" // No '\0' in this buffer!
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* char dst[NITEMS(src) + 1];
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*
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* zustr2stp(dst, src, NITEMS(src));
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* puts(dst);
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*/
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inline char *
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zustr2stp(char *restrict dst, const char *restrict src, size_t sz)
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{
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return stpcpy(mempcpy(dst, src, strnlen(src, sz)), "");
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}
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#endif // include guard
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