Messages in this thread | | | Date | Fri, 15 Jul 2022 17:44:22 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH 01/13 v2] tracing/events: Add __vstring() and __assign_vstr() helper macros |
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On Fri, 15 Jul 2022 17:42:14 -0400 Steven Rostedt <rostedt@goodmis.org> wrote:
> It uses the helper: > > #define __trace_event_vstr_len(fmt, va) \ > ({ \ > va_list __ap; \ > int __ret; \ > \ > va_copy(__ap, *(va)); \ > __ret = vsnprintf(NULL, 0, fmt, __ap); \ > va_end(__ap); \ > \ > min(__ret, TRACE_EVENT_STR_MAX); \ > })
I forgot to mention what is different in v2. I fixed what happened to be in the change log, as there was an off by one error. I just updated the change log in my git repo to have the above be:
It uses the helper:
#define __trace_event_vstr_len(fmt, va) \ ({ \ va_list __ap; \ int __ret; \ \ va_copy(__ap, *(va)); \ __ret = vsnprintf(NULL, 0, fmt, __ap) + 1; \ va_end(__ap); \ \ min(__ret, TRACE_EVENT_STR_MAX); \ })
-- Steve
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