17 lines
255 B
C
17 lines
255 B
C
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#include <stdio.h>
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ungetc(ch, iop)
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int ch;
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FILE *iop;
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{
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if ( ch < 0 || !io_testflag(iop,IO_READMODE))
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return EOF;
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if (iop->_ptr == iop->_buf) {
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if (iop->_count != 0) return EOF;
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iop->_ptr++;
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}
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iop->_count++;
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*--iop->_ptr = ch;
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return(ch);
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}
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