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tools lib traceevent: Changed return logic of trace_seq_printf() and trace_seq_vprintf() APIs

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In order to make libtraceevent into a proper library, its API should be
straightforward.

The trace_seq_printf() and trace_seq_vprintf() APIs have inconsistent
returned values with the other trace_seq_* APIs.

This path changes the return logic of trace_seq_printf() and
trace_seq_vprintf() to return the number of printed characters, as the
other trace_seq_* related APIs.

Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20181201040852.485792891@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Tzvetomir Stoyanov 2018-11-30 23:08:10 -05:00 committed by Arnaldo Carvalho de Melo
parent 2e4318a287
commit 6d2d6fd7e3
1 changed files with 12 additions and 5 deletions
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17
tools/lib/traceevent/trace-seq.c
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@ -100,7 +100,8 @@ static void expand_buffer(struct trace_seq *s)
* @fmt: printf format string
*
* It returns 0 if the trace oversizes the buffer's free
* space, 1 otherwise.
* space, the number of characters printed, or a negative
* value in case of an error.
*
* The tracer may use either sequence operations or its own
* copy to user routines. To simplify formating of a trace
@ -129,9 +130,10 @@ trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
goto try_again;
}
s->len += ret;
if (ret > 0)
s->len += ret;
return 1;
return ret;
}
/**
@ -139,6 +141,10 @@ trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
* @s: trace sequence descriptor
* @fmt: printf format string
*
* It returns 0 if the trace oversizes the buffer's free
* space, the number of characters printed, or a negative
* value in case of an error.
* *
* The tracer may use either sequence operations or its own
* copy to user routines. To simplify formating of a trace
* trace_seq_printf is used to store strings into a special
@ -163,9 +169,10 @@ trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
goto try_again;
}
s->len += ret;
if (ret > 0)
s->len += ret;
return len;
return ret;
}
/**