Experimental Physics and
Industrial Control System

Dirk Zimoch <[email protected]> · Tue, 05 Jun 2012 15:11:42 +0200

haquin wrote:

Hi,

I use a CALC record for bitwise operation for exemple : CALC="A & 0x001F"
with a Linux IOC everything is OK,

but with a VxWorks IOC I have the following error: Syntax error, unknown

operator/operand in expression "(A & 0x001F)"

It seems that the 0x001F is not supported, right ?

Yes.

could it be changed ?

Yes.

regards.

That happens because strtod() accepts hex numbers in Linux but not in

vxWorks.

Linux:
man strtod:

"The expected form of the (initial portion of the) string is optional

leading white space as recognized by isspace(3), an optional plus

(‘‘+’’) or minus sign (‘‘-’’) and then either (i) a decimal number, or

(ii) a hexadecimal number, or (iii) an infinity, or (iv) a NAN (not-a-

number)."

vxWorks 5.5 strtod documentation:

"The expected form of the subject sequence is an optional plus or minus

decimal-point character, then an optional exponent part but no floating

suffix. The subject sequence is defined as the longest initial

subsequence of the input string, starting with the first non-white-space

character, that is of the expected form. The subject sequence contains

no characters if the input string is empty or consists entirely of white

space, or if the first non-white-space character is other than a sign, a

digit, or a decimal-point character."

I think adding something like this to epicsStrtod should fix the problem:

if (epicsStrnCaseCmp("0x", cp, 2) == 0) {
  return (double)strtoul(str, endp, 16);
}

Dirk

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System