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Annotation of 42BSD/usr.lib/libU77/getc_.c, revision 1.1.1.1

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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