xcall NUMCHK, string {,len {,rc}}

This function checks a string to see if it contains valid numeric characters only, and possibly that it is of a certain length.

string  (String)  [in/out]

string to be searched. string is stripped of leading and trailing spaces and tabs and returned that way, regardless of whether valid.

len  (Num)  [in]

if specified, stripped string length must match.

rc  (F,6)  [out]

optional return value specifying okay (0), or that string contains invalid characters or is not of len length (-1). Note that NUMCHK may be passed to the XFUNC() function, in which case rc is not really relevant since the function itself returns the same value.

2006 August, Build 963

Add rountine to A-Shell.