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Annotation of 42BSD/usr.lib/libU77/getc_.c, revision 1.1

1.1     ! root        1: /*
        !             2: char id_getc[] = "@(#)getc_.c  1.3";
        !             3:  *
        !             4:  * get a character from the standard input
        !             5:  *
        !             6:  * calling sequence:
        !             7:  *     integer getc
        !             8:  *     ierror = getc (char)
        !             9:  * where:
        !            10:  *     char will be read from the standard input, usually the terminal
        !            11:  *     ierror will be 0 if successful; a system error code otherwise.
        !            12:  */
        !            13: 
        !            14: #include       "../libI77/f_errno.h"
        !            15: #include       "../libI77/fiodefs.h"
        !            16: 
        !            17: extern unit units[];   /* logical units table from iolib */
        !            18: 
        !            19: long getc_(c, clen)
        !            20: char *c; long clen;
        !            21: {
        !            22:        int     i;
        !            23:        unit    *lu;
        !            24: 
        !            25:        lu = &units[STDIN];
        !            26:        if (!lu->ufd)
        !            27:                return((long)(errno=F_ERNOPEN));
        !            28:        if (lu->uwrt && ! nowreading(lu))
        !            29:                return((long)errno);
        !            30:        if ((i = getc (lu->ufd)) < 0)
        !            31:        {
        !            32:                if (feof(lu->ufd))
        !            33:                        return(-1L);
        !            34:                i = errno;
        !            35:                clearerr(lu->ufd);
        !            36:                return((long)i);
        !            37:        }
        !            38:        *c = i & 0177;
        !            39:        return(0L);
        !            40: }

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