[metadata]
id = "PRE04-C"
type = "recommendation"
category = "PRE"
number = 4
title = "Do not reuse a standard header file name"
description = """
If a file with the same name as a standard header is placed in the search path
for included source files, the behavior isundefined. The following table from
the C Standard, subclause 7.1.2 [ISO/IEC 9899:2011], lists these standard
headers: <assert.h><float.h><math.h><stdatomic.h><stdlib.h><time.h><complex.h><i
nttypes.h><setjmp.h><stdbool.h><stdnoreturn.h><uchar.h><ctype.h><iso646.h><signa
l.h><stddef.h><string.h><wchar.h><errno.h><limits.h><stdalign.h><stdint.h><tgmat
h.h><wctype.h><fenv.h><locale.h><stdarg.h><stdio.h><threads.h>
"""
severity = "Low"
likelihood = "Unlikely"
priority = "P2"
level = "L3"
cert_version = "2016 Edition (Wiki)"
last_modified = "Oct 01, 2025"
[rules.cert_c.PRE04-C]
enabled = true
[references]
wiki = "https://wiki.sei.cmu.edu/confluence/display/c/PRE04-C.+Do+not+reuse+a+standard+header+file+name"