From bcaba6c60501cc5d17ea25b419bd26c76c54075a Mon Sep 17 00:00:00 2001
From: "Carsten Haitzler (Rasterman)" <raster@rasterman.com>
Date: Thu, 10 Nov 2016 17:57:14 +0900
Subject: [PATCH] mtrack - faster with less snprintfing

---
 mtrack.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/mtrack.c b/mtrack.c
index 8eb867e..ee29c8d 100644
--- a/mtrack.c
+++ b/mtrack.c
@@ -337,25 +337,39 @@ _mhook_trace_log(const char *str)
      }
    inside = 1;
    tot = sizeof(buf);
-   n = backtrace(bt, 256);
    strcpy(buf, str);
    p = buf + strlen(str); tot -= p - buf;
+   n = backtrace(bt, 250);
    strcpy(p, " =="); p += 3; tot -=  3;
    if (n > 0)
      {
         skip = 3;
-        
+
         for (i = skip; i < n; i++)
           {
              int len = 0;
              Dl_info info;
-             
+
              if (dladdr(bt[i], &info))
                {
-                  len = snprintf(p, tot, " %s", info.dli_sname);
+                  if (info.dli_sname)
+                    {
+                       len = strlen(info.dli_sname);
+                       p[0] = ' ';
+                       strcpy(p + 1, info.dli_sname);
+                       len = 1 + len;
+                    }
+                  else
+                    {
+                       strcpy(p, " #");
+                       len = 2;
+                    }
                }
              else
-               len = snprintf(p, tot, " ?");
+               {
+                  strcpy(p, " ?");
+                  len = 2;
+               }
              p += len; tot -= len;
           }
      }