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Joachim Nilsson
be08bcd09d
At the moment only GCC is supported on non-GNU systems, unfortunately. GNU systems usually have GLIBC, or another library with strndupa(). This strndupa() implementation requires GCC for the builtin alloca API. Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
59 lines
2.1 KiB
C
59 lines
2.1 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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#ifndef GNU_STRING_STRNDUPA_H
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#define GNU_STRING_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 <gnu/string/strnlen.h>
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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 /* GNU_STRING_STRNDUPA_H */
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