From 9fd215b0281c44300572e74cf6cf8eaeef1db9f3 Mon Sep 17 00:00:00 2001
From: Johny Mattsson <jmattsson@dius.com.au>
Date: Wed, 27 Jan 2016 19:32:10 +1100
Subject: [PATCH] Corrected sprintf() prototype & behaviour.

---
 app/libc/c_stdio.c | 6 ++++--
 app/libc/c_stdio.h | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/app/libc/c_stdio.c b/app/libc/c_stdio.c
index e52f2ffc..36aae1ce 100644
--- a/app/libc/c_stdio.c
+++ b/app/libc/c_stdio.c
@@ -1094,12 +1094,14 @@ exponent(char *p, int exp, int fmtch)
 #endif /* FLOATINGPT */
 
 
-void c_sprintf(char *s, char *fmt, ...)
+int c_sprintf(char *s, const char *fmt, ...)
 {
+    int n;
     va_list arg;
     va_start(arg, fmt);
-    vsprintf(s, fmt, arg);
+    n = vsprintf(s, fmt, arg);
     va_end(arg);
+    return n;
 }
 
 #endif
diff --git a/app/libc/c_stdio.h b/app/libc/c_stdio.h
index c652f0bf..631f5c3a 100644
--- a/app/libc/c_stdio.h
+++ b/app/libc/c_stdio.h
@@ -60,7 +60,7 @@ extern void output_redirect(const char *str);
 #define c_sprintf os_sprintf
 #else
 #include "c_stdarg.h"
-void c_sprintf(char* s,char *fmt, ...);
+int c_sprintf(char* s,const char *fmt, ...);
 #endif
 
 // #define c_vsprintf ets_vsprintf