3 files changed, 6 insertions, 3 deletions

diff --git a/firmware/common/sprintf.c b/firmware/common/sprintf.c
index 6c1855e06b..35f977a0a3 100644
--- a/firmware/common/sprintf.c
+++ b/firmware/common/sprintf.c
@@ -292,7 +292,7 @@ int fdprintf(int fd, const char *fmt, ...)
     return fpr.bytes; /* return 0 on error */
 }
 
-int vfnprintf(int (*push)(void *userp, unsigned char data), void *userp, const char *fmt, va_list ap)
+int vuprintf(int (*push)(void *userp, unsigned char data), void *userp, const char *fmt, va_list ap)
 {
     return format(push, userp, fmt, ap);
 }
diff --git a/firmware/include/sprintf.h b/firmware/include/sprintf.h
index b07ac9dfb6..869b73eb13 100644
--- a/firmware/include/sprintf.h
+++ b/firmware/include/sprintf.h
@@ -32,6 +32,9 @@ int snprintf (char *buf, size_t size, const char *fmt, ...)
 int vsnprintf (char *buf, int size, const char *fmt, va_list ap);
 int fdprintf (int fd, const char *fmt, ...) ATTRIBUTE_PRINTF(2, 3);
 
-int vfnprintf(int (*push)(void *userp, unsigned char data), void *userp, const char *fmt, va_list ap);
+/* callback function is called for every output character (byte) with userp and
+ * should return 0 when ch is a char other than '\0' that should stop printing */
+int vuprintf(int (*push)(void *userp, unsigned char data),
+              void *userp, const char *fmt, va_list ap);
 
 #endif /* __SPRINTF_H__ */
diff --git a/firmware/logf.c b/firmware/logf.c
index 76b017c092..7d4ffe24af 100644
--- a/firmware/logf.c
+++ b/firmware/logf.c
@@ -214,7 +214,7 @@ void _logf(const char *fmt, ...)
     DEBUGF("%s\n", buf);
 #endif
 
-    vfnprintf(logf_push, NULL, fmt, ap);
+    vuprintf(logf_push, NULL, fmt, ap);
     va_end(ap);
     
     /* add trailing zero */