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Annotation of researchv10dc/libc/stdio/ungetc.c, revision 1.1

1.1     ! root        1: #include <stdio.h>
        !             2: 
        !             3: ungetc(c, iop)
        !             4: register FILE *iop;
        !             5: {
        !             6:        if (c == EOF)
        !             7:                return(-1);
        !             8:        if ((iop->_flag&_IOREAD)==0 || iop->_ptr <= iop->_base)
        !             9:                if (iop->_ptr == iop->_base && iop->_cnt==0)
        !            10:                        iop->_ptr++;
        !            11:                else
        !            12:                        return(-1);
        !            13:        iop->_cnt++;
        !            14:        if(*--iop->_ptr != c)   /* sscanf buffer may be read-only */
        !            15:                *iop->_ptr = c;
        !            16:        return(c);
        !            17: }

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