xnu-6153.141.1.tar.gz

[apple/xnu.git] / bsd / libkern / libkern.h

diff --git a/bsd/libkern/libkern.h b/bsd/libkern/libkern.h
index ab4dfd3ee583a86dfc1406e99fa6d763796088c1..b95c70e3cb8ece4d151089470342375ca32dd274 100644 (file)
--- a/bsd/libkern/libkern.h
+++ b/bsd/libkern/libkern.h
@@ -159,7 +159,13 @@ extern char     *strsep(char **, const char *);
 extern void     *memchr(const void *, int, size_t);
 extern void     url_decode(char *str);
 
+/*
+ * NOTE: snprintf() returns the full length of the formatted string even if it
+ * couldn't fit in the supplied buffer.
+ * Use scnprintf() if you need the actual number of bytes (minus the \0)
+ */
 int     snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
+int     scnprintf(char *, size_t, const char *, ...) __printflike(3, 4);
 
 /* sprintf() is being deprecated. Please use snprintf() instead. */
 int     sprintf(char *bufp, const char *, ...) __deprecated __printflike(2, 3);
@@ -209,6 +215,7 @@ int vsscanf(const char *, char const *, va_list);
 
 extern int      vprintf(const char *, va_list) __printflike(1, 0);
 extern int      vsnprintf(char *, size_t, const char *, va_list) __printflike(3, 0);
+extern int      vscnprintf(char *, size_t, const char *, va_list) __printflike(3, 0);
 
 #if XNU_KERNEL_PRIVATE
 extern int      vprintf_log_locked(const char *, va_list, bool addcr) __printflike(1, 0);