usr/src/usr.bin/f77/libU77/getc_.c

/*
char id_getc[] = "@(#)getc_.c   1.3";
 *
 * get a character from the standard input
 *
 * calling sequence:
 *      integer getc
 *      ierror = getc (char)
 * where:
 *      char will be read from the standard input, usually the terminal
 *      ierror will be 0 if successful; a system error code otherwise.
 */

#include        "../libI77/f_errno.h"
#include        "../libI77/fiodefs.h"

extern unit units[];    /* logical units table from iolib */

long getc_(c, clen)
char *c; long clen;
{
        int     i;
        unit    *lu;

        lu = &units[STDIN];
        if (!lu->ufd)
                return((long)(errno=F_ERNOPEN));
        if (lu->uwrt && ! nowreading(lu))
                return((long)errno);
        if ((i = getc (lu->ufd)) < 0)
        {
                if (feof(lu->ufd))
                        return(-1L);
                i = errno;
                clearerr(lu->ufd);
                return((long)i);
        }
        *c = i & 0177;
        return(0L);
}