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* modules/string-h: Renamed from modules/string. * modules/string-h-tests: Renamed from modules/string-tests. * modules/string-h-c++-tests: Renamed from modules/string-c++-tests. * tests/test-string-h.c: Renamed from tests/test-string.c. * tests/test-string-h-c++.cc: Renamed from tests/test-string-c++.cc. * tests/test-string-h-c++2.cc: Renamed from tests/test-string-c++2.cc. * doc/posix-headers/string.texi: Update. * doc/posix-functions/strcat.texi: Update. * doc/posix-functions/strcpy.texi: Update. * doc/posix-functions/strncpy.texi: Update. * modules/* (Depends-on): Update. * modules/string: New file.
31 lines
1.1 KiB
Plaintext
31 lines
1.1 KiB
Plaintext
@node strncpy
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@subsection @code{strncpy}
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@findex strncpy
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/strncpy.html}
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Gnulib module: string-h or strncpy
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@mindex string-h
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@mindex strncpy
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Portability problems fixed by Gnulib module @code{string-h} or Gnulib module @code{strncpy}:
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@itemize
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@item
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This function cannot be called from plain inline or extern inline functions
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on some platforms:
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macOS 10.8.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@end itemize
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Note: This function was designed for the use-case of filling a fixed-size
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record with a string, before writing it to a file. This function is
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@strong{not} appropriate for copying a string into a bounded memory area,
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because you have no guarantee that the result will be NUL-terminated.
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Even if you add the NUL byte at the end yourself, this function is
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inefficient (as it spends time clearing unused memory) and will allow
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silent truncation to occur, which is not a good behavior for GNU programs.
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For more details, see @url{https://meyering.net/crusade-to-eliminate-strncpy/}.
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