# stristr() -- Case-insensitive strstr()
# Usage: stristsr string match
# depend: strtolower(): http://www.ronggeng.net/index.php/2009/04/24/strtolower/
#
# Example 1:
#
# string="saya SUKA Makan";
# if stristr "${string}" "suk"; then
# 	echo "OK";
# fi
#
# Example 2:
#
# buff="$(ps ax)";
# if ! stirstr "${buff}" "httpd"; then
#	echo "service httpd down";
# fi

stristr() {
	[ $# -eq 2 ] || return 1;
	! type -t strtolower &>/dev/null && return 1;
	local _str1=$(strtolower "$1");
	local _str2=$(strtolower "$2");

	[ "$_str1" = "$_str2" ] || [[ "$_str1" = *$_str2* ]] && return 0;
	return 1;
}