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Annotation of 43BSD/lib/libc/stdio/ungetc.c, revision 1.1

1.1     ! root        1: #if defined(LIBC_SCCS) && !defined(lint)
        !             2: static char sccsid[] = "@(#)ungetc.c   5.3 (Berkeley) 3/26/86";
        !             3: #endif LIBC_SCCS and not lint
        !             4: 
        !             5: #include <stdio.h>
        !             6: 
        !             7: ungetc(c, iop)
        !             8:        register FILE *iop;
        !             9: {
        !            10:        if (c == EOF || (iop->_flag & (_IOREAD|_IORW)) == 0 ||
        !            11:            iop->_ptr == NULL || iop->_base == NULL)
        !            12:                return (EOF);
        !            13: 
        !            14:        if (iop->_ptr == iop->_base)
        !            15:                if (iop->_cnt == 0)
        !            16:                        iop->_ptr++;
        !            17:                else
        !            18:                        return (EOF);
        !            19: 
        !            20:        iop->_cnt++;
        !            21:        *--iop->_ptr = c;
        !            22: 
        !            23:        return (c);
        !            24: }

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