wrapper: improve performance of verbose_log

This reduces the number of syscalls per call from 3 to 1, on one
specific game when piping everything to /dev/null this reduces the
runtime from 14.115s to 8.800s.

Signed-off-by: Jari Vetoniemi <mailroxas@gmail.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/wrapper/wrapper.c b/src/wrapper/wrapper.c
index d78f1a4..b3249b6 100644
--- a/src/wrapper/wrapper.c
+++ b/src/wrapper/wrapper.c
@@ -21,12 +21,12 @@ verbose_log(const char *fmt, ...)
 
    static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
    pthread_mutex_lock(&mutex);
-   fprintf(stderr, "%lu: ", pthread_self());
    va_list ap;
    va_start(ap, fmt);
-   vfprintf(stderr, fmt, ap);
+   char buf[1024];
+   vsnprintf(buf, sizeof(buf), fmt, ap);
    va_end(ap);
-   fputc('\n', stderr);
+   fprintf(stderr, "%lu: %s\n", pthread_self(), buf);
    pthread_mutex_unlock(&mutex);
 }