From 1edf1d1f7f86301f5c37857cd2c521e0e1522e6e Mon Sep 17 00:00:00 2001
From: rsiddharth <s@ricketyspace.net>
Date: Sat, 2 Nov 2019 11:58:25 -0400
Subject: nserver: stats: Update Stats_dump.

* nserver/src/stats.c (Stats_dump): Update function.
* nserver/src/stats.h (Stats_dump): Return (char *).
---
 nserver/src/stats.c | 25 +++++++++++++++++++------
 nserver/src/stats.h |  2 +-
 2 files changed, 20 insertions(+), 7 deletions(-)

(limited to 'nserver')

diff --git a/nserver/src/stats.c b/nserver/src/stats.c
index 68b99cc..6b99e7e 100644
--- a/nserver/src/stats.c
+++ b/nserver/src/stats.c
@@ -44,11 +44,24 @@ void Stats_sample(Stats *st, double s)
     st->n += 1;
 }
 
-void Stats_dump(Stats *st)
+char *Stats_dump(Stats *st)
 {
-    fprintf(stderr,
-            "sum: %f, sumsq: %f, n: %ld, "
-            "min: %f, max: %f, mean: %f, stddev: %f",
-            st->sum, st->sumsq, st->n, st->min, st->max, Stats_mean(st),
-            Stats_stddev(st));
+    size_t char_sz = sizeof(char);
+    size_t dstr_len = 280 * char_sz;
+
+    // allocate space for dump string.
+    char *dstr = calloc(dstr_len, char_sz);
+    check_mem(dstr);
+
+    // dump into dump str.
+    int rc = snprintf(dstr, dstr_len,
+                      "sum: %f, sumsq: %f, n: %ld, "
+                      "min: %f, max: %f, mean: %f, stddev: %f",
+                      st->sum, st->sumsq, st->n, st->min, st->max,
+                      Stats_mean(st), Stats_stddev(st));
+    check(rc > 0, "stats dump failed");
+
+    return dstr;
+ error:
+    return NULL;
 }
diff --git a/nserver/src/stats.h b/nserver/src/stats.h
index 997a505..776eb21 100644
--- a/nserver/src/stats.h
+++ b/nserver/src/stats.h
@@ -17,7 +17,7 @@ Stats *Stats_create();
 
 void Stats_sample(Stats *st, double s);
 
-void Stats_dump(Stats *st);
+char *Stats_dump(Stats *st);
 
 static inline double Stats_mean(Stats *st)
 {
-- 
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