Add dprintf() and vdprintf() from POSIX.1-2008. Like getline(),

dprintf() is a simple wrapper around another function, so we may as
well implement it. But also like getline(), we can't prototype it by
default right now because it would break too many ports.

1 files changed, 20 insertions, 4 deletions

diff --git a/include/stdio.h b/include/stdio.h
index 1de521e..78c62e8 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 */
 
 /*