Mathematical functions application

Yeah, I thought it was a little insane too.. 

adds:

Sum, Multiply, Divide, Subtract, Modulus, GT, LT, GTE, LTE, EQ functions to asterisk

All functions follow the same basic pattern for parameters:

parameter 1 = the name of the return variable
parameter 2 = the first number
parameter 3 = the second number

Each action is perfromed as

 Action param1 on param2

eg: 

 Action = Divide
 Param1 = 10
 Param2 = 2

Results in 

 Divide 10 by 2


Example dialplan:

exten => 11099,1,SUM(RV,1,20)
exten => 11099,2,NOOP(${RV})
exten => 11099,3,MULTIPLY(RV,10,2)
exten => 11099,4,NOOP(${RV})
exten => 11099,5,DIVIDE(RV,10,2)
exten => 11099,6,NOOP(${RV})
exten => 11099,7,SUBTRACT(RV,10,2)
exten => 11099,8,NOOP(${RV})
exten => 11099,9,MODULUS(RV,2,10)
exten => 11099,10,NOOP(${RV})
exten => 11099,11,DIVIDE(RV,10,0)
exten => 11099,12,NOOP(${RV})
exten => 11099,13,SUBTRACT(RV,10,200)
exten => 11099,14,NOOP(${RV})
exten => 11099,15,DIVIDE(RV,1,20)
exten => 11099,16,NOOP(${RV})
exten => 11099,17,LT(RV,1,20)
exten => 11099,18,NOOP(${RV})
exten => 11099,19,GTE(RV,1,20)
exten => 11099,20,NOOP(${RV})
exten => 11099,21,GT(RV,101,20)
exten => 11099,22,NOOP(${RV})
exten => 11099,23,EQ(RV,1,20)
exten => 11099,24,NOOP(${RV})
exten => 11099,25,LTE(RV,20,20)
exten => 11099,26,NOOP(${RV})


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Makefile stuff:


APPS+=app_math.so


app_math.so: app_math.c
	$(CC) -D_GNU_SOURCE -shared -Xlinker -x -o $@ $< -lz -L/usr/lib