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Annotation of 42BSD/lib/libc/stdio/ungetc.c, revision 1.1.1.1

1.1       root        1: /*     ungetc.c        4.2     83/09/25        */
                      2: 
                      3: #include <stdio.h>
                      4: 
                      5: ungetc(c, iop)
                      6:        register FILE *iop;
                      7: {
                      8:        if (c == EOF)
                      9:                return (-1);
                     10:        if ((iop->_flag&_IOREAD) == 0 || iop->_ptr <= iop->_base)
                     11:                if (iop->_ptr == iop->_base && iop->_cnt == 0)
                     12:                        *iop->_ptr++;
                     13:                else
                     14:                        return (EOF);
                     15:        iop->_cnt++;
                     16:        *--iop->_ptr = c;
                     17:        return (c);
                     18: }

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