#!/bin/sh -e
#
#    errno - search POSIX error codes by error number, error name,
#            or error description
#
#    Copyright (C) 2010 Dustin Kirkland <kirkland@ubuntu.com>
#
#    Authors:
#        Dustin Kirkland <kirkland@ubuntu.com>
#        Kees Cook <kees@ubuntu.com>
#        Scott Moser <smoser@ubuntu.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

if which gcc >/dev/null; then
	# Header finding trick from Kees Cook <kees@ubuntu.com>
	headers=$(echo "#include <asm/errno.h>" | gcc -E - | grep "\.h" | awk -F\" '{print $2}' | sort -u)
else
	headers="/usr/include/asm-generic/errno*.h"
fi

code="$1"

for code in "${@}"; do
	if [ "$code" -le 0 -o "$code" -ge 0 ] 2>/dev/null; then
		# Input is a number, search for a particular matching code
		sed -n "s,^#define\s\+\([^[:space:]]\+\s\+${code}\s.*\),\1,p" ${headers}
	else
		# Input is not a number, search for any matching strings
		sed -n "s,^#define\s\+\(.*${code}.*\),\1,Ip" ${headers}
	fi
done