musl - an implementation of the standard library for Linux-based systems
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#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;
}
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