1 files changed, 20 insertions, 4 deletions

diff --git a/include/stdio.h b/include/stdio.h
index 1de521e76e38..78c62e824f1d 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -345,12 +345,14 @@ char	*tempnam(const char *, const char *);
 ssize_t	 getdelim(char ** __restrict, size_t * __restrict, int,
 	    FILE * __restrict);
 int	 renameat(int, const char *, int, const char *);
+int	 vdprintf(int, const char * __restrict, __va_list);
 
 /*
- * Every programmer and his dog wrote functions called getline()
- * before POSIX.1-2008 came along and decided to usurp the name, so we
- * don't prototype getline() by default unless one of the following is true:
- *   a) the app has requested it specifically by defining _WITH_GETLINE
+ * Every programmer and his dog wrote functions called getline() and dprintf()
+ * before POSIX.1-2008 came along and decided to usurp the names, so we
+ * don't prototype them by default unless one of the following is true:
+ *   a) the app has requested them specifically by defining _WITH_GETLINE or
+ *      _WITH_DPRINTF, respectively
  *   b) the app has requested a POSIX.1-2008 environment via _POSIX_C_SOURCE
  *   c) the app defines a GNUism such as _BSD_SOURCE or _GNU_SOURCE
  */
@@ -368,6 +370,20 @@ int	 renameat(int, const char *, int, const char *);
 ssize_t	 getline(char ** __restrict, size_t * __restrict, FILE * __restrict);
 #endif
 
+#ifndef _WITH_DPRINTF
+#if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
+#define	_WITH_DPRINTF
+#elif defined(_POSIX_C_SOURCE)
+#if _POSIX_C_SOURCE > 200809
+#define	_WITH_DPRINTF
+#endif
+#endif
+#endif
+
+#ifdef _WITH_DPRINTF
+int	 dprintf(int, const char * __restrict, ...);
+#endif
+
 #endif /* __BSD_VISIBLE || __POSIX_VISIBLE >= 200809 */
 
 /*