fio: support modulus for the arithmetic parser

[fio.git] / exp / expression-parser.y

diff --git a/exp/expression-parser.y b/exp/expression-parser.y
index f5a7981f2fbfa8eb6bdacc61d5d99c6e81c9e1f5..fa19a51ad68268571d96eb723de2b15d0dafac86 100644 (file)
--- a/exp/expression-parser.y
+++ b/exp/expression-parser.y
@@ -59,6 +59,7 @@ extern void yyrestart(FILE *file);
 %left '-' '+'
 %left '*' '/'
 %right '^'
+%left '%'
 %nonassoc UMINUS
 %parse-param { long long *result }
 %parse-param { double *dresult }
@@ -132,6 +133,15 @@ expression:        expression '+' expression {
                                $$.dval = $1.ival * $2.ival;
                        $$.has_error = $1.has_error || $2.has_error;
                }
+       |       expression '%' expression {
+                       if ($1.has_dval || $3.has_dval)
+                               yyerror(0, 0, 0, 0, "modulo on floats");
+                       if ($3.ival == 0)
+                               yyerror(0, 0, 0, 0, "divide by zero");
+                       else
+                               $$.ival = $1.ival % $3.ival;
+                       $$.has_error = $1.has_error || $3.has_error;
+               }
        |       expression '^' expression {
                        $$.has_error = $1.has_error || $3.has_error;
                        if (!$1.has_dval && !$3.has_dval) {