Re: mask for bitwise operation in CALC record

[Dirk Zimoch <dirk.zimoch@psi.ch>]

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