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https://github.com/troglobit/libite.git
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Joachim Wiberg
407b8f6dbf
The tree.h and queue.h include guards must remain so users don't accidentally get their system queue.h included as well. Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/* ==========================================================================
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* strndupa.h - Re-implementation of glibc strndupa.
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* --------------------------------------------------------------------------
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* Copyright (c) 2009 William Ahern
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to permit
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* persons to whom the Software is furnished to do so, subject to the
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* following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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* NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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* ==========================================================================
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*/
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/**
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* @file strndupa.h
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* @author William Ahern
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* @date 2009
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* @copyright MIT License
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*/
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#ifndef LIBITE_STRNDUPA_H_
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#define LIBITE_STRNDUPA_H_
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#if !defined(HAVE_STRNDUPA)
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#if defined(strndupa)
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#define HAVE_STRNDUPA 1
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#endif
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#endif
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#if !HAVE_STRNDUPA
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#if defined(__GNUC__)
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#include <stddef.h> /* size_t */
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#include <string.h> /* memcpy(3) */
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#include "strnlen.h"
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/**
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* Duplicate part of string on stack
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* @param src string to duplicate
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* @param lim number of bytes to dupliate
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* @returns the result of memcpy(3)
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*/
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#define strndupa(src, lim) (__extension__ ({ \
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size_t len_ = strnlen(src, lim); \
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char *dst_ = __builtin_alloca(len_ + 1); \
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dst_[len_] = '\0'; \
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(char *)memcpy(dst_, src, len_); \
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}))
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#else /* If not GCC, e.g. Clang */
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+#error strndupa() may use an unsupported GNU C API, please forward any fix to maintainer, cheers!
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#endif /* __GNUC__ */
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#endif /* !HAVE_STRNDUPA */
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#endif /* LIBITE_STRNDUPA_H */
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#ifdef __cplusplus
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}
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#endif
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