fputc.c

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extern int putc(int, char);

#ifndef SYSERR
#define SYSERR (-1)
#endif
#ifndef EOF
#define EOF (-2)
#endif

int fputc(int c, int dev)
{
    if (SYSERR == (int)putc(dev, c))
    {
        return EOF;
    }
    else
    {
        return c;
    }
}