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Annotation of 43BSDTahoe/usr.lib/libU77/getc_.c, revision 1.1.1.1

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:  *     @(#)getc_.c     5.1     6/7/85
                      7:  */
                      8: 
                      9: /*
                     10:  * get a character from the standard input
                     11:  *
                     12:  * calling sequence:
                     13:  *     integer getc
                     14:  *     ierror = getc (char)
                     15:  * where:
                     16:  *     char will be read from the standard input, usually the terminal
                     17:  *     ierror will be 0 if successful; a system error code otherwise.
                     18:  */
                     19: 
                     20: #include       "../libI77/f_errno.h"
                     21: #include       "../libI77/fiodefs.h"
                     22: 
                     23: extern unit units[];   /* logical units table from iolib */
                     24: 
                     25: long getc_(c, clen)
                     26: char *c; long clen;
                     27: {
                     28:        int     i;
                     29:        unit    *lu;
                     30: 
                     31:        lu = &units[STDIN];
                     32:        if (!lu->ufd)
                     33:                return((long)(errno=F_ERNOPEN));
                     34:        if (lu->uwrt && ! nowreading(lu))
                     35:                return((long)errno);
                     36:        if ((i = getc (lu->ufd)) < 0)
                     37:        {
                     38:                if (feof(lu->ufd))
                     39:                        return(-1L);
                     40:                i = errno;
                     41:                clearerr(lu->ufd);
                     42:                return((long)i);
                     43:        }
                     44:        *c = i;
                     45:        return(0L);
                     46: }

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