from re import match, sub

class wifi_fieldstrength:
	def __init__(self, name = "wlan0"):
		self.name = name
		self.wf_name = "/proc/net/wireless"

	def read(self):
		ret = False
		f = open(self.wf_name, "r")
		for line in f:
			line = line.strip()
			mstr = "^" + self.name
			if match(mstr, line):
				line = sub("\s+", " ", line)
				tmp = line.split(" ")
				tmp[3] = sub("\.", "", tmp[3])
				ret = int(tmp[3])
		return ret