usr/src/usr.bin/f77/libU77/fputc_.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)fputc_.c    5.1     %G%
 */

/*
 * write a character to a logical unit bypassing formatted I/O
 *
 * calling sequence:
 *      integer fputc
 *      ierror = fputc (unit, char)
 * where:
 *      char will be sent to the logical unit
 *      ierror will be 0 if successful; a system error code otherwise.
 */

#include        "../libI77/fiodefs.h"
#include        "../libI77/f_errno.h"

extern unit units[];    /* logical units table from iolib */

long fputc_(u, c, clen)
long *u; char *c; long clen;
{
        int     i;
        unit    *lu;

        if (*u < 0 || *u >= MXUNIT)
                return((long)(errno=F_ERUNIT));
        lu = &units[*u];
        if (!lu->ufd)
                return((long)(errno=F_ERNOPEN));
        if (!lu->uwrt && ! nowwriting(lu))
                return((long)errno);
        putc (*c, lu->ufd);
        if (ferror(lu->ufd))
        {
                i = errno;
                clearerr(lu->ufd);
                return((long)i);
        }
        return(0L);
}