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Annotation of 43BSDTahoe/usr.lib/libU77/fgetc_.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)fgetc_.c    5.1     6/7/85
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * get a character from a logical unit bypassing formatted I/O
        !            11:  *
        !            12:  * calling sequence:
        !            13:  *     integer fgetc
        !            14:  *     ierror = fgetc (unit, char)
        !            15:  * where:
        !            16:  *     char will return a character from logical unit
        !            17:  *     ierror will be 0 if successful; a system error code otherwise.
        !            18:  */
        !            19: 
        !            20: #include       "../libI77/fiodefs.h"
        !            21: #include       "../libI77/f_errno.h"
        !            22: 
        !            23: extern unit units[];   /* logical units table from iolib */
        !            24: 
        !            25: long fgetc_(u, c, clen)
        !            26: long *u; char *c; long clen;
        !            27: {
        !            28:        int     i;
        !            29:        unit    *lu;
        !            30: 
        !            31:        if (*u < 0 || *u >= MXUNIT)
        !            32:                return((long)(errno=F_ERUNIT));
        !            33:        lu = &units[*u];
        !            34:        if (!lu->ufd)
        !            35:                return((long)(errno=F_ERNOPEN));
        !            36:        if (lu->uwrt && ! nowreading(lu))
        !            37:                return((long)errno);
        !            38:        if ((i = getc (lu->ufd)) < 0)
        !            39:        {
        !            40:                if (feof(lu->ufd))
        !            41:                        return(-1L);
        !            42:                i = errno;
        !            43:                clearerr(lu->ufd);
        !            44:                return((long)i);
        !            45:        }
        !            46:        *c = i;
        !            47:        return(0L);
        !            48: }

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