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Annotation of 43BSDReno/lib/libU77/fgetc_.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:  *     @(#)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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