scripts/validate-cdefs

#!/bin/bash
#
# SPDX-License-Identifier: BSD-3-Clause
#
# Copyright © 2024 Keith Packard
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above
#    copyright notice, this list of conditions and the following
#    disclaimer in the documentation and/or other materials provided
#    with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
#    contributors may be used to endorse or promote products derived
#    from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
#

input="$1"
shift
echo '#include "'$input'"' | ("$@" -E - || exit 0) |
    awk 'BEGIN {
		contents = 0;
		cdefs = 0;
		 filename = "";
	}
	{
		if ($1 == "#") {
			name = $3;
			gsub(/"/, "", name);
			if (name ~ "^.*/newlib/libc/include/sys/cdefs.h$") {
				if (contents && !cdefs) {
					printf("%s: contents before cdefs: \"%s\"\n", filename, first_contents);
					exit(1);
				}
				cdefs = 1;
			}
		} else {
			if (NF != 0) {
				contents = 1;
				first_contents=$0
			}
		}
	}
	END {
		if (!cdefs) {
			printf("%s: cdefs never included\n", filename);
			exit 1;
		}
	}' || exit 1