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SubjectRe: [PATCH 3/3] tools lib traceevent: Introduce pevent_strerror
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On Tue, 2012-06-12 at 16:42 +0900, Namhyung Kim wrote:

> +/*
> + * This must have a same ordering as the enum pevent_errno.
> + */
> +static const char * const pevent_error_str[] = {
> + "failed to allocate memory",
> + "failed to parse event",
> + "failed to read event id",
> + "failed to read event format",
> + "failed to read event print fmt",
> + "failed to allocate field name for ftrace",
> +};
> +

Here's a little macro trick to keep the strings and enums always in
sync:

#define __PEVENT_ERRNO_CODES \
_C(PEVENT_ERRNO__MEM_ALLOC_FAILED, "failed to allocate memory"), \
_C(PEVENT_ERRNO__PARSE_EVENT_FAILED, "failed to parse event"), \
_C(PEVENT_ERRNO__READ_ID_FAILED, "failed to read event id"), \
_C(PEVENT_ERRNO__READ_FORMAT_FAILED, "failed to read event format"), \
_C(PEVENT_ERRNO__READ_PRINT_FAILED, "failed to read event print fmt"),\
_C(PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED,"failed to allocate field name for ftrace"),

#undef _C
#define _C(a,b) b
static const char * const pevent_error_str[] = { __PEVENT_ERROR_CODES };

#undef _C
#define _C(a, b) a

enum pevent_errno {
__PEVENT_ERRNO__BEFORE_START = -100000 - 1,
__PEVENT_ERRNO_CODES
__PEVENT_ERRNO__END,
};

#define __PEVENT_ERRNO__START (__PEVENT_ERRNO__BEFORE_START + 1)

Just saying ;-)

-- Steve






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