clean up stdio_impl.h

this header evolved to facilitate the extremely lazy practice of
omitting explicit includes of the necessary headers in individual
stdio source files; not only was this sloppy, but it also increased
build time.

now, stdio_impl.h is only including the headers it needs for its own
use; any further headers needed by source files are included directly
where needed.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/stdio/vsnprintf.c b/src/stdio/vsnprintf.c
index 6f19b028..be2c44eb 100644
--- a/src/stdio/vsnprintf.c
+++ b/src/stdio/vsnprintf.c
@@ -1,4 +1,8 @@
 #include "stdio_impl.h"
+#include <limits.h>
+#include <string.h>
+#include <errno.h>
+#include <stdint.h>
 
 static size_t sn_write(FILE *f, const unsigned char *s, size_t l)
 {