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Name:       isammsg

Purpose:    return text of message for an error number

Prototype:  char *isammsg(int errno);

Header:     isam.h

Inputs:     errno    - Error number

Description:
        isammsg returns a pointer to the text of a message associated with
        the error number errno.  Usually the errno is the global ISAM
        variable isam_errno, though you can use this routine to get the text
        for any error number.  If the errno is not an error number that
        ISAM recognizes, isammsg returns a pointer to the message "Unknown
        isam error number".

        The returned messsage is READ-ONLY.

Returns:
        Returns pointer to message text, or pointer to a default message if
        errno is not a valid error number.