Library /sys$common/syshlp/helplib.hlb  —  CRTL  strfmon  Return Values
    x                  The number of bytes written to the string
                       pointed to by s, not including the null-
                       terminating character.
    -1                 Indicates an error. The function sets errno to
                       one of the following values:

                       o  EINVAL - A conversion specification is
                          syntactically incorrect.

                       o  E2BIG - Processing the complete format
                          string would produce more than maxsize
                          bytes.
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