SEI CERT C Coding Standard

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If a file with the same name as a standard header is placed in the search path for included source files, the behavior is undefined.

The following table from the C Standard, section 7.1.2 [ISO/IEC 9899:2011], lists these standard headers:

<complex<ctype<errno<fenv<float<iso646<limits<locale<math<setjmp<stdarg<stdbool<stddef<stdint<stdio<stdlib<string<time<uchar<wchar<wctype
<assert.h><float.h><math.h><stdatomic.h><stdlib.h><time.h>
<complex.h><inttypes.h><setjmp.h><stdbool.h><stdnoreturn.h><uchar.h>
<ctype.h><iso646.h><signal.h><stddef.h><string.h><wchar.h>
<errno.h><limits.h><stdalign.h><stdint.h><tgmath.h><wctype.h>
<fenv.h><locale.h><stdarg.h><stdio.h><threads.h> 

Do not reuse standard header file names, system-specific header file names, or other header file names.

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