93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
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/*
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* SPDX-FileCopyrightText: 2022 - 2023, Alejandro Colomar <alx@kernel.org>
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef SHADOW_INCLUDE_LIB_STPECPY_H_
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#define SHADOW_INCLUDE_LIB_STPECPY_H_
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#include <config.h>
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#if !defined(HAVE_STPECPY)
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#include <stdbool.h>
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#include <stddef.h>
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#include <string.h>
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#include "defines.h"
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inline char *stpecpy(char *dst, char *end, const char *restrict src);
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/*
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* SYNOPSIS
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* char *_Nullable stpecpy(char *_Nullable dst, char end[0],
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* const char *restrict src);
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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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* end Pointer to one after the last element of the buffer
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* pointed to by `dst`. Usually, it should be calculated
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* as `dst + NITEMS(dst)`.
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*
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* src Source string to be copied into dst.
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*
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* DESCRIPTION
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* This function copies the string pointed to by src, into a string
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* at the buffer pointed to by dst. If the destination buffer,
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* limited by a pointer to its end --one after its last element--,
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* isn't large enough to hold the copy, the resulting string is
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* truncated.
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*
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* This function can be chained with calls to [v]stpeprintf().
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*
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* RETURN VALUE
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* dst + strlen(dst)
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* • On success, this function returns a pointer to the
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* terminating NUL byte.
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*
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* end
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* • If this call truncated the resulting string.
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* • If `dst == end` (a previous chained call to these
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* functions truncated).
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* NULL
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* • If `dst == NULL` (a previous chained call to
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* [v]stpeprintf() failed).
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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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inline char *
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stpecpy(char *dst, char *end, const char *restrict src)
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{
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bool trunc;
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char *p;
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size_t dsize, dlen, slen;
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if (dst == end)
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return end;
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if (dst == NULL)
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return NULL;
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dsize = end - dst;
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slen = strnlen(src, dsize);
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trunc = (slen == dsize);
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dlen = slen - trunc;
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p = mempcpy(dst, src, dlen);
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*p = '\0';
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return p + trunc;
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}
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#endif // !HAVE_STPECPY
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#endif // include guard
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