lttng_strerror(): accept positive and negative codes

Some functions return positive `lttng_error_code` enumerator values
while other return negative values.

Make lttng_strerror() accept positive and negative codes. This improves
the API UX and will make the documentation less complex.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I359cef98ae32991d1a01b7f2cd484ece7bab2df9

diff --git a/src/lib/lttng-ctl/lttng-ctl.cpp b/src/lib/lttng-ctl/lttng-ctl.cpp
index d4ec1c81b81bcd8886e07054fc5cbf1ef5ac993e..63841df403f249d5aeb681ce81a0ec671b7d4242 100644 (file)
--- a/src/lib/lttng-ctl/lttng-ctl.cpp
+++ b/src/lib/lttng-ctl/lttng-ctl.cpp
@@ -1769,10 +1769,14 @@ int lttng_list_syscalls(struct lttng_event **events)
 
 /*
  * Returns a human readable string describing
- * the error code (a negative value).
+ * the error code (positive or negative value).
  */
 const char *lttng_strerror(int code)
 {
+       if (code > 0) {
+               code = -code;
+       }
+
        return error_get_str(code);
 }