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authorRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
committerRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
commit0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch)
tree6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/stdio/fwide.c
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initial check-in, version 0.5.0 v0.5.0
Diffstat (limited to 'src/stdio/fwide.c')
-rw-r--r--src/stdio/fwide.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/stdio/fwide.c b/src/stdio/fwide.c
new file mode 100644
index 00000000..f4da47f6
--- /dev/null
+++ b/src/stdio/fwide.c
@@ -0,0 +1,10 @@
+#include "stdio_impl.h"
+
+#define SH (8*sizeof(int)-1)
+#define NORMALIZE(x) ((x)>>SH | -((-(x))>>SH))
+
+int fwide(FILE *f, int mode)
+{
+	if (!f->mode) f->mode = NORMALIZE(mode);
+	return f->mode;
+}