[hackers] [blind] blind-arithm: add abs || Mattias Andrée

[git]

commit 2debbbe6e70b66357fa510850b57c47406a87249
Author:     Mattias Andrée <maand...@kth.se>
AuthorDate: Wed Jan 25 16:56:05 2017 +0100
Commit:     Mattias Andrée <maand...@kth.se>
CommitDate: Wed Jan 25 16:56:05 2017 +0100

    blind-arithm: add abs
    
    Signed-off-by: Mattias Andrée <maand...@kth.se>

diff --git a/man/blind-arithm.1 b/man/blind-arithm.1
index 048fa0a..df5887f 100644
--- a/man/blind-arithm.1
+++ b/man/blind-arithm.1
@@ -50,13 +50,18 @@ is the value of the right-hand operand.
 .TP
 .B log
 Calculate the logarithm of the left-hand operand
-and divid it by the logarithm of the rigth-hand operand.
+and divide it by the logarithm of the rigth-hand operand.
 .TP
 .B min
 Select the lowest operand.
 .TP
 .B max
 Select the highest operand.
+.TP
+.B abs
+Calculate the the sum of absolute value of the left-hand
+operand subtracted by the right-hand operand, and the
+right-hand operand
 .SH OPTIONS
 .TP
 .B -a
diff --git a/src/blind-arithm.c b/src/blind-arithm.c
index 2ac1652..bc30bee 100644
--- a/src/blind-arithm.c
+++ b/src/blind-arithm.c
@@ -26,7 +26,8 @@ typedef void (*process_func)(struct stream *left, struct 
stream *right, size_t n
        X(exp, *lh = pow(*lh, rh))\
        X(log, *lh = log(*lh) / log(rh))\
        X(min, *lh = *lh < rh ? *lh : rh)\
-       X(max, *lh = *lh > rh ? *lh : rh)
+       X(max, *lh = *lh > rh ? *lh : rh)\
+       X(abs, *lh = fabs(*lh - rh) + rh)
 
 #define X(NAME, ALGO)\
        static void\